TM-281A144MHz FM TRANSCEIVER

SERVICE MANUAL

This product uses Lead Free solder.This product complies with the RoHS directive for the European market.

© 2011-8 PRINTED IN JA PANB51-8988-00 (N) 217

TM-281A144MHz FM TRANSCEIVER

Key top(K29-9497-01)

Modular jack (MIC)(E58-0535-05)

Panel assy(A62-1187-13)

Knob (VOL)(K29-9498-03)

Knob (ENC)(K29-9499-03)

DISASSEMBLY FOR REPAIR ......................2

CIRCUIT DESCRIPTION ..............................5

COMPONENTS DESCRIPTION ...................9

SEMICONDUCTOR DATA .........................11

PARTS LIST ...............................................12

EXPLODED VIEW ......................................18

PACKING ....................................................19

ADJUSTMENT ..........................................20

TERMINAL FUNCTION .............................29

PC BOARD

TX-RX UNIT (X57-8130-XX) ..................30

SCHEMATIC DIAGRAM ............................36

BLOCK DIAGRAM .....................................40

LEVEL DIAGRAM ......................................42

SPECIFICATIONS ...................BACK COVER

CONTENTS

TM-281A

2

Document Copyrights

Copyright 2011 by Kenwood Corporation. All rights re-served.

No part of this manual may be reproduced, translated, distributed, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or other-wise, for any purpose without the prior written permission of Kenwood.

Disclaimer

While every precaution has been taken in the preparation of this manual, Kenwood assumes no responsibility for er-rors or omissions. Neither is any liability assumed for dam-ages resulting from the use of the information contained herein. Kenwood reserves the right to make changes to any products herein at any time for improvement purposes.

1. Disassembly Procedure

1. When removing the cabinet, fi rst remove the two screws from the right and left with a phillips screwdriver.

Then, hook your fi nger on the edge of the cabinet and pull it out until it is over the chassis protrusion. Remove the cabinet by prying the cabinet as shown below.

Cabinet

DISASSEMBLY FOR REPAIR

2. To remove the panel assembly, fi rst turn the transceiver upside down.

Then, insert a fl at-head screwdriver into the holes of the chassis and tilt it in the direction as shown by the arrow.

Panel assembly

Holes

TM-281A

3

3. Disconnect the fl at cable from the connector of the panel assembly.

Flat cable

4. To remove the Display PCB, first remove the volume knob q.

Then, remove the encoder knob w. Remove the two screws e from the Display PCB using a

phillips screwdriver. Remove the speaker holder of the key top from the

speaker. r Remove the Display PCB with the speaker from the panel

assembly. t

Speaker holder of the key top

Panel assembly

Display PCB

5. When removing the TX-RX PCB, fi rst remove the solder of the antenna hot pin and positive terminal of the DC cord.

Then, remove the 15 screws from the TX-RX PCB, power module, and audio amp.

Positive terminal of the DC cord Antenna hot pin

Power module

TX-RX PCB

Audio amp

Note: When you supply power to the TX-RX PCB after removing

the TX-RX PCB from the chassis, solder the positive and ground terminals of the DC cord (recommendation: E30-3448-25) to the +B and GND terminals of the TX-RX PCB.

TX-RX PCBComponent side

GND

+B


TM-281A

4

6. Pull it out behind the chassis by rotating the bush e of the DC cord 90 degrees in the direction of the arrow after the screw q in the negative terminal is removed, and the positive terminal w is removed from the chassis.

DC cord

2. Precautions for Reassembly

1. Mount the key top and speaker onto the panel assembly. Then, tighten the two screws q of the Display PCB. Insert the protrusion area of the key top into the groove

area of the panel assembly using a fl at-head screwdriver. w

Then, mount the encoder knob e and volume knob r.

Key top

Panel assembly

Display PCB

Speaker

2. When mounting the panel assembly, pass the fl at cable through the hole of the chassis as shown below, then connect the fl at cable to connector of the panel assembly.

Hole ofthe chassis

Panel assembly

Panelassembly

Chassis

Chassis

3. Fit the panel assembly into the two tabs of the chassis top side fi rst.

Then, fit the panel assembly into the two tabs of the chassis bottom side by turning the panel assembly.

Panel assembly

Tabs

3. How to Mount the AF PA IC (IC715)

Solder it onto the TX-RX unit (A/2) so that the AF PA IC part number label “LA4600” is on the reverse side.

Pin 1 markerIC715

TX-RX UNIT (X57-8130-XX) (A/2): TX-RX sectionComponent side


TM-281A

5

Frequency Confi guration

The receiver utilizes double conversion. The first IF is 49.95MHz and the second IF is 450kHz. The fi rst local oscil-lator signal is supplied from the PLL circuit.

The PLL circuit in the transmitter generates the neces-sary frequencies. Figure 1 shows the frequencies.

ANTSW

RFAMP

1stMIX

AFPA

TCXO

MICAMP

x3multiply

RFAMP

POWERAMP

CF 450kHz

MCF49.95MHz

IF SYSTEM

PLL/VCO

16.8MHz

50.4MHz

ANT

RX

TX

SP

MIC1/2

Fig. 1 Frequency confi guration

Receiver System

The receiver is a double conversion superheterodyne. The frequency confi guration is shown in Figure 1.

■ Front-end RF Amplifi erAn incoming signal from the antenna is applied to an RF

amplifier (Q505) after passing through a transmit/receive switch circuit (D309, D311, D306 and D307 are off) and a band pass fi lter (L515, L514 and varactor diodes: D509, D508). After the signal is amplified, the signal is filtered through a band pass fi lter (L511, L510 and varactor diodes: D506, D505) to eliminate unwanted signals before it is passed to the fi rst mixer.

The voltage of these diodes are controlled by tracking the MCU (IC707) center frequency of the band pass fi lter. (See Fig. 2.)

■ First MixerThe signal from the RF amplifi er is heterodyned with the

fi rst local oscillator signal from the PLL frequency synthesiz-er circuit at the fi rst mixer (Q504) to create a 49.95MHz fi rst intermediate frequency (1st IF) signal. The fi rst IF signal is then fed through the monolithic crystal fi lter (MCF: XF501) to further remove spurious signals.

■ IF Amplifi erThe fi rst IF signal is amplifi ed by Q503, and then goes to

IC501 (FM processing IC). The signal is heterodyned again with a second local oscillator signal within IC501 to create a 450kHz second IF signal. The second IF signal is then fed through a 450kHz ceramic fi lter (Wide: CF501, Narrow: CF502) to further eliminate unwanted signals before it is amplifi ed and FM detected in IC501.

Item Rating

Nominal center frequency 49.95MHz

Pass bandwidth ±4.0kHz or more at 3dB

50dB stop bandwidth ±25.0kHz or less

Ripple 1.0dB or less

Insertion loss 5.0dB or less

Guaranteed attenuation 80dB or more at fo ± 900kHz

Spurious 50dB or more at fo ± 1MHz

Terminating impedance 270Ω / 8.5pF

Table 1 Crystal fi lter (L71-0655-05): XF501

Item Rating

Nominal center frequency 450kHz

6dB bandwidth ±7.5kHz or more

50dB bandwidth ±15.0kHz or less



Guaranteed attenuation 35.0dB or more within fo ± 100kHz

I/O matching impedance 1.5kΩ

Table 2 Ceramic fi lter (L72-1034-05): CF501

Item Rating

Nominal center frequency 450kHz

6dB bandwidth ±4.5kHz or more

50dB bandwidth ±10.0kHz or less



Guaranteed attenuation 60.0dB or more within fo ± 100kHz

I/O matching impedance 2.0kΩ

Table 3 Ceramic fi lter (L72-0999-05): CF502

ANT

L515,L514D509,D508

BPFQ505

RF AMPQ503

IF AMPIC705

D/A CONVERTERQ504MIX

XF501MCF

D306,D307D309,D311

ANTSW

IC705D/A

IC706DC AMP

Q501x3 multiply

IC21/2 divider

X1TCXO

IC501FM IC

1st local OSC (VCO/PLL)

W/NO(EVOL2)

CF501 (Wide)

CF502 (Narrow)

TV

MCU

L511,L510D506,D505

BPF

Fig. 2 Receiver system

CIRCUIT DESCRIPTION

TM-281A

6

■ Wide/Narrow Switching CircuitThe Wide port (pin 65) and Narrow port (pin 64) of the

MCU is used to switch between ceramic filters. When the Wide port is high, the ceramic fi lter SW diodes (D501, D502) cause CF501 to turn on to receive a Wide signal.

When the Narrow port is high, the ceramic fi lter SW di-odes (D501, D502) cause CF502 to turn on to receive a Nar-row signal. (See Fig. 3.)

NarrowIC707 64pin

IF_IN MIX_O

IC501FM IC

CF502(Narrow)

CF501(Wide)

R50

5

R50

7

R506

R504

D501 D502

WideIC707 65pin

Fig. 3 Wide/Narrow switching circuit

■ AF Signal SystemThe detection signal from the FM IC (IC501) goes to the

D/A converter (IC705) to adjust the gain and is output to the AF fi lter (IC709) for characterizing the signal. The AF signal output from IC709 and the DTMF signal, BEEP signal are summed and the resulting signal goes to the D/A converter (IC705). The AFO output level is adjusted by the D/A con-verter. The signal output from the D/A converter is input to the audio power amplifi er (IC715). The AF signal from IC715 switches between the internal speaker and the speaker jack (J701) output. (See Fig. 4.)

AFFilter

D/ACONV.

D/ACONV.

IC705 IC709 IC705W/NO(EVOL2)

AF PA

IC715 SP

FM IC

IC501

Fig. 4 AF signal system

■ Squelch CircuitThe detection output from the FM IC (IC501) passes

through a noise amplifier (Q502) to detect noise. A volt-age is applied to the MCU (IC707). The MCU controls the squelch according to the voltage (SQIN) level. The signal from the RSSI pin of IC501 is used for the S-meter. The electric field strength of the receive signal can be known before the SQIN voltage is input to the MCU, and the scan stop speed is improved.

Q502NOISE AMP D503IC501 IC707

FILOUT

RSSI

DETMCUFM IC

SQIN

RSSI

Fig. 5 Squelch circuit

PLL Frequency Synthesizer

The PLL circuit generates the fi rst local oscillator signal for reception and the RF signal for transmission.

■ PLLThe frequency step of the PLL circuit is 5 or 6.25kHz. A

16.8MHz reference oscillator signal is divided at IC1 by a fixed counter to produce the 5 or 6.25kHz reference fre-quency. The voltage controlled oscillator (VCO) output sig-nal is buffer amplifi ed by Q9, then divided in IC1 by a dual-module programmable counter. The divided signal is com-pared in phase with the 5 or 6.25kHz reference signal in the phase comparator in IC1. The output signal from the phase comparator is fi ltered through a low-pass fi lter and passed to the VCO to control the oscillator frequency. (See Fig. 6.)

■ VCODouble the operating frequency is generated by Q6 in

transmit mode and Q4 in receive mode. The oscillator fre-quency is controlled by applying the VCO control voltage, obtained from the phase comparator, to the varactor diodes (D4 and D6 in transmit mode and D3 and D5 in receive mode). The TX/RX pin is set high in receive mode causing Q7 and Q5 to turn Q6 off, and turn Q4 on. The TX/RX pin is set low in transmit mode. The outputs from Q4 and Q6 are amplifi ed by Q9 and sent to the RF amplifi ers through a 1/2 divider (IC2). (See Fig. 6.)

D4,D6IC2

Q6TX VCO

Q9BUFFAMP

D3,D5

Q4RX VCO

Q5,Q7T/R SW

1/2divider

Chargepump

LPF

Phasecomparator

1/M

1/N5kHz/6.25kHz

5kHz/6.25kHz

REFOSC

16.8MHz

PLLDATA

IC1 : PLL ICQ3

AMP

RF amplifiers

Q1,Q2

TX/RX (MCU)

Fig. 6 PLL circuit

CIRCUIT DESCRIPTION

TM-281A

7

■ Unlock CircuitDuring reception, the 8RC signal goes high, the 8TC

signal goes low, and Q708 turns on. Q710 turns on and a voltage is applied to 8R. During transmission, the 8RC sig-nal goes low, the 8TC signal goes high and Q709 turns on. Q711 turns on and a voltage is applied to 8T.

The MCU monitors the PLL IC (IC1) LD signal directly. When the PLL is unlocked during transmission, the PLL LD signal goes low. The MCU detects this signal and makes the 8TC signal low. When the 8TC signal goes low, no volt-age is applied to 8T, and no signal is transmitted. (See Fig. 7.)

IC707MCU

Q708SW

Q710SW

IC1PLL

Q709SW

Q711SW

LD

8RC

8C

8R 8T

8TC

PLL lock: LD “H”

Fig. 7 Unlock circuit

Transmitter System

■ OutlineThe transmitter circuit produces and amplifi es the desired

frequency directly. It FM-modulates the carrier signal by means of a varicap diode.

■ Power Amplifi er CircuitThe transmit output signal from the VCO passes through

a 1/2 divider (IC2) and the transmission/reception selection diode (D9, D10) and is amplified by Q303. The amplified signal goes to the power module (IC302) through a low-pass fi lter. The low-pass fi lter removes unwanted high-frequency harmonic components, and the resulting signal is transmit-ted through the antenna terminal. (See Fig. 8.)

■ APC CircuitThe automatic transmission power control (APC) circuit

detects part of a fi nal amplifi er output with a diode (D313, D314) and applies a voltage to IC303. IC303 compares the APC control voltage (PC) generated by the D/A converter (IC705) and DC amplifi er (IC706) with the detection output voltage. IC303 generates the voltage to control the Vgg of IC302 and stabilizes the transmission output.

The APC circuit is confi gured to protect over current of IC302 due to fl uctuations of the load at the antenna end and to stabilize transmission output at voltage and temperature variations. (See Fig. 9.)

Fig. 8 Transmitter system

Fig. 9 APC circuit

Q10

RF AMP

Q303

ANT

DRIVEAMP

IC302

POWERMODULE

IC2

1/2DIVIDER

IC705 Q6

D/A CONVERTER

D/A CONVERTER

X1

TCXO16.8MHz

VCO

IC1

PLL

Q9

BUFFER

Q3

RF AMP

IC706

BUFFER

IC101

IC705

MIC KEYINPUT MCU

IC706

SUMAMP

IC704IC703MIC

MIC/IDC SPLATTERFILTER

DRIVEAMP

Q303

POWERMODULE

IC302

DCAMP

IC706

ANTSW

D306,D307D309,D311

LPF

ANT

POWERDET

D313,D314IC303

APCCONTROL

D9

IC705(PC/TVO)

(PC)

CIRCUIT DESCRIPTION

TM-281A

8

Control Circuit

The MCU carries out the following tasks (See Fig. 10.):1) Controls the WIDE, NARROW, and TX/RX outputs.2) Controls the display circuit.3) Controls the PLL IC (IC1).4) Controls the D/A converter (IC705) and adjusts the vol-

ume, modulation and transmission power.

IC705D/A

converter

IC1PLL

IC707MCU

EVLLDDTCK

PLLE

Fig. 10 Control circuit

■ Memory CircuitThe transceiver has an 64k-bit EEPROM (IC708). The EE-

PROM contains adjustment data. The MCU (IC707) controls the EEPROM through three serial data lines. (See Fig. 11.)

EEPCK

IC707MCU

IC708EEPROM

EEPSDT

EEPWP

Fig. 11 Memory circuit

■ Display CircuitThe MCU (IC707) controls the display LCD and LEDs.

When power is on, the LCD driver will use the BL line to control the LCD illumination and key backlight LEDs.

The brightness function is controlled by switch Q904. The LCD driver (IC901) and MCU (IC707) communicate through the CE, CL, DI, and DO lines. (See Fig. 12.)

Q901SW

Q902SW

IC707MCU

D903~D905

Q903SW

D906~D911

Q904SW

IC901LCD

driver

CECLDODIBL

COM0~COM3SEG0~SEG30

LCD

BRI

Fig. 12 Display circuit

■ Key Matrix CircuitThe front panel has function keys. Each of them is con-

nected to a cross point of a matrix of the KI1 to KI3 and KSI to KS2 ports of the LCD driver.

The LCD driver monitors the status of the KI1 to KI3 and KS1 to KS2 ports. If the state of one of the ports changes, the LCD driver assumes that the key at the matrix point cor-responding to that port has been pressed.

IC901LCD

driver

KI1KI2KI3

KS2KS1

FUNC

REV

CALL

VFO

MRMHz(Encoder)

Fig. 13 Key matrix circuit

■ EncodeThe CTCSS and DCS signals are output from TONE of the

MCU (IC707). The DTMF signal is output from DTMF of the MCU (IC707). These signals are summed with a MIC signal by the summing amplifi er (IC706), and the resulting signal goes to the D/A converter (IC705) to adjust the MOD level, and then goes to the buffer amplifi er (IC706).

Part of the signal goes to the TCXO, and the rest goes to the D/A converter (IC705) in order to adjust the modulation balance between the VCO and TCXO.

X1TCXO

VCO

IC706SUMAMP

IC705D/A

IC705D/A

IC706BUFFER

IC1PLL

Amp

MICIC707MCU

TONE

DTMF

Fig. 14 Encode

■ Decode

• CTCSS/DCSThe signal (W/NO (EVOL2)) goes to DTMF IN (pin 95) of

the MCU (IC707) through the amplifi er (IC709). The CTCSS/DCS signal will pass through the low-pass fi lters in the MCU (IC707) and be decoded within the MCU (IC707).

IC707MCU

IC709AMPDTMF IN W/NO (EVOL2)

95

Fig. 15 Decode

CIRCUIT DESCRIPTION

TM-281A

9

■ D/A ConverterThe D/A converter (IC705) is used to adjust the MO mod-

ulation, AF volume, TV voltage, FC reference voltage, and PC POWER CONTROL voltage level.

Adjustment values are sent from the MCU as serial data. The D/A converter has a resolution of 256 and the following relationship is valid:

D/A output = (Vin – VDAref) / 256 x n + VDArefVin: Analog inputVDAref: D/A reference voltage (Approx. 2.2V)n: Serial data value from the microprocessor (MCU)

Power Supply Circuit

When the power switch on the display unit is pressed, the power port on the display unit which is connected to port 17 (POWER), goes low, then port 82 (SBC) goes high, Q713 turns on, SB SW (Q714) turns on and power (SB) is supplied to the radio.

When the DC power is supplied to the radio, the volt-age regulator IC (IC713) is supplied to the MCU VDD and reset voltage detect IC (IC714). IC714 will generate a signal (RESET) into the reset terminal of the MCU (IC707) to carry out a power ON reset. If DC power is less than approxi-mately 9.5V, the radio is unable to power on.

When the DC power voltage deceases from the normal voltage, the INT voltage detector IC (IC712) will set to high

on MCU port 18 (INT) if B line becomes less than approxi-mately 9.5V. The MCU will then send the backup data to the EEPROM (IC708) and enter stop mode.

This circuit has an overvoltage protection circuit. If a DC voltage of 18V or higher is applied to the base of Q707, this voltage turns Q707 on and will set to high on MCU port 18 (INT). The MCU will then send the backup data to the EE-PROM (IC708) and enter stop mode. (See Fig. 16.)

Q714SW

Q713SW

Q707SW

IC713AVR

D712D710

B

IC714RST

SBC

R82

4R

825

INT

5MIC707MCU

POWERSW

POWER

RE

SE

T

5M

IC712INT

SB

Fig. 16 Power supply circuit

CIRCUIT DESCRIPTION

TX-RX UNIT (X57-8130-XX)

Ref. No. Use / Function Operation / Condition / Compatibility

IC1 PLL IC Frequency control

IC2 Divider Frequency divider

IC302 Power module TX fi nal amplifi er

IC303 APC controller TX power control

IC501 FM ICFM detector/ 2nd mixer/ RSSI/ Noise amplifi er

IC703 OP amplifi er MIC amplifi er/ IDC

IC704 OP amplifi er Splatter fi lter

IC705Digital potentiometer

Frequency adjustmentModulation balance adjustmentAF level adjustmentBacklight controlModulation limit adjustmentTX power/ BPF controlRX signal level control


IC706 OP amplifi erBuffer amplifi er/ SUM amplifi er/ DC amplifi er/ 1/2 VCC

IC707 MCU

IC708 EEPROM Tuning data/ Memory data

IC709 OP amplifi er Audio fi lter

IC710 5V AVR 5C

IC711 8V AVR 8C

IC712 Voltage detection MCU INT voltage detection

IC713 5V AVR 5M

IC714 Voltage detection MCU reset voltage detection

IC715 Audio amplifi er Audio fi nal amplifi er

IC901 LCD driver Display control

Q1,2 Switching Charge pump

Q3 RF amplifi er PLL Fin

COMPONENTS DESCRIPTION

TM-281A

10


Q4 Oscillator RX VCO

Q5 T/R switch On when RX

Q6 Oscillator TX VCO

Q7 T/R switch

Q8 Ripple fi lter

Q9 Buffer amplifi er Output of VCO

Q10 RF amplifi er Output of VCO

Q303 Drive amplifi er TX driver

Q501 Tripler 16.8MHz × 3

Q502 SQL amplifi er Noise amplifi er

Q503 IF amplifi er

Q504 Mixer 1st mixer

Q505 RF amplifi er LNA

Q506 PC/TV switch On when TX

Q701 AGC/ MIC mute

Q702,703 Beat shift switch Active while beat shift is ON

Q704,705 AF mute Active while AFM is “H”

Q706 Buffer amplifi er RX audio

Q707Over voltage detection

Active when PS voltage is more than 18V

Q708 DC switch (8R) Active while RX

Q709 DC switch (8T) Active while TX

Q710 DC switch (8R) Active while RX

Q711 DC switch (8T) Active while TX

Q712 AF mute Active while SPM is “H”

Q713,714 DC switch (SB) Active when power is ON

Q715 AF mute Active while AMPSW is “H”

Q901Key backlight switch

Q902 DC switch

Q903LCD backlight switch

Q904Brightness function switch

D1 Voltage dropped

D2 Ripple fi lter

D3VCO frequency control

RX


TX



RX


TX

D7 VCO modulation

D8 Ripple fi lter

D9,10 RF switch TX/RX

D301 Voltage protection 5.1V Zener diode

D305 Protection PC/TV

D306,307 ANT switch On when TX

D309 ANT switch On when TX

D311 ANT switch On when TX

D312Temperature compensation

D313,314APC voltage detect

D316 Protection

D501,502 IF switch Wide/Narrow

D503 Detection Noise squelch

D504 Protection

D505,506 RF BPF tuning

D508,509 RF BPF tuning

D702 Surge absorption CM

D704 Surge absorption MIC key

D705 Surge absorption RXD

D706 Surge absorption PTT

D708 MIC mute

D709 Detection AGC

D710 Protection

D711 Limiter

D712Over voltage detection

On when PS voltage is more than 18V

D714Reverse connec-tion protection

D901Reverse connec-tion protection

D902 Surge absorption 6.2V Zener diode

D903~905 LED Key backlight

D906~911 LED LCD backlight

COMPONENTS DESCRIPTION

TM-281A

11

MCU: 30622MEP540GU (TX-RX unit IC707)

Pin No. Name I/O Function

1 TONE O CTCSS/DCS output

2 DTMF O DTMF/BEEP/1750Hz output

3 PLLE O PLL IC chip select

4,5 NC I Not used

6 GND - GND

7 CNVSS - Not used

8 EVLLD O D/A converter chip select

9 BSHIFT O Beat shift

10 RESET I Reset

11 XOUT O X’tal (8MHz)

12 VSS - GND

13 XIN I X’tal (8MHz)

14 VCC - +5V

15 GND - GND

16 NC I Not used

17 POWER I Power key input

18 INT I MCU stop

19 NC I Not used

20 TX/RX O TX/RX

21 UL I PLL unlock detect

22,23 NC I Not used

24 EEPSDT I/O EEPROM data

25 EEPCK O EEPROM clock

26 EEPWP O EEPROM write protect

27,28 NC I (Nch open drain)

29 TXD1 O Not used

30 RXD1 I Not used

31 CLKFLS I Not used

32 BSYFLS O Not used

33 TXD O To PC

34 RXD I From PC

35 PTT I PTT input

36~38 NC I Not used

39 EMPFLS I/O Not used

40~43 NC I Not used

44 CEFLS I/O Not used

45~49 NC I Not used

50 AFM O AF mute

51 SPM O Speaker mute

52 AMPSW O AF AMP switch


53 DT O Common data

54 CK O Common clock

55 NC I Not used

56 DST1 I Destination 1

57~59 DST2~DST4 I Destination 2~4

60 VCC - +5V

61 NC I Not used

62 VSS - GND

63 ADJ I For adjustment mode

64 NARROW O Narrow

65 WIDE O Wide

66,67 NC I Not used

68 CL O Clock for LCD

69 CE O Chip enable for LCD

70 DO O Output data to LCD

71 DI I Input data from LCD

72 NC I Not used

73 ENCB I Encoder input B

74 ENCA I Encoder input A

75,76 NC O Not used

77 MICMT O MIC mute

78 NC I Not used

79 8RC O 8R control

80 8TC O 8T control

81 NC I Not used

82 SBC O Battery switch

83~85 NC I Not used

86 CM I MIC key check

87 MICKEY2 I For AMR DTMF keypad MIC

88 MICKEY I For AMR DTMF keypad MIC

89 VOL I Volume encoder

90 TEMP2 I Temperature 2

91 TEMP1 I Temperature 1

92 RSSI I RSSI input

93 SQIN I Squelch input

94 AVSS - GND

95 DTMF IN I CTCSS/DCS/1050Hz input

96 VREF - +5V

97 AVCC - +5V

98~100 NC I Not used

SEMICONDUCTOR DATA

TM-281A

12

✽ New Parts. indicates safety critical components.Parts without Parts No. are not supplied.Les articles non mentionnes dans le Parts No. ne sont pas fournis.Teile ohne Parts No. werden nicht geliefert.

L : Scandinavia K : USA P : CanadaY : PX (Far East, Hawaii) T : England E : Eu ropeC : China X : Australia M : Oth er Areas

Ref. No. Ad dress Parts No. Description Desti-nation

Newparts Ref. No. Ad dress Parts No. Description Desti-

nationNewparts

PARTS LIST

TM-281A


1 1B ✽ A02-4156-01 PLASTIC CABINET2 2B ✽ A10-4152-01 CHASSIS3 3A ✽ A62-1187-13 PANEL ASSY

5 3A B11-1809-03 ILLUMINATION GUIDE (LCD)6 3A B38-0885-15 LCD7 3C ✽ B62-2347-10 INSTRUCTION MANUAL K,M27 3C ✽ B62-2348-10 INSTRUCTION MANUAL M37 3C ✽ B62-2349-10 INSTRUCTION MANUAL M4

10 2B E04-0167-15 RF COAXIAL RECEPTACLE (M)11 2B E23-1346-04 GROUND TERMINAL (CLIP)12 3A E29-1201-04 INTER CONNECTOR (LCD)13 2B ✽ E30-7743-05 DC CORD14 1C ✽ E30-7744-05 DC CORD ACCESSORY

15 2A ✽ E37-1542-05 FLAT CABLE16 3A ✽ E37-1545-05 PARALLEL CORD (SP)

18 1C F52-0024-05 FUSE (BLADE TYPE) 15A ACCESSORY

19 3A ✽ G13-2370-04 CUSHION (LCD)20 3A ✽ G53-1878-03 PACKING (PANEL)

22 1D ✽ H12-4330-02 PACKING FIXTURE (RADIO)23 2D ✽ H12-4331-02 PACKING FIXTURE24 2D ✽ H52-2503-02 ITEM CARTON CASE K

26 1C J19-1584-15 HOLDER (MIC) ACCESSORY27 3A J21-8463-03 MOUNTING HARDWARE (LCD)28 2C J29-0726-03 BRACKET ACCESSORY

30 3A ✽ K29-9497-01 KEY TOP31 3A ✽ K29-9498-03 KNOB (VOL)32 3A ✽ K29-9499-03 KNOB (ENC)

A 1A,1B N35-2604-43 BINDING HEAD MACHINE SCREWB 1A,1B,2B N67-3008-48 PAN HEAD SEMS SCREWC 3A N80-2008-48 PAN HEAD TAPTITE SCREWD 1B,2B N87-2608-48 BRAZIER HEAD TAPTITE SCREW34 2C ✽ N99-2082-05 SCREW SET ACCESSORY

36 3A T07-0779-05 SPEAKER37 1C T91-0624-65 MICROPHONE ACCESSORY M237 1C ✽ T91-0641-75 MICROPHONE (DTMF) ACCESSORY K,M3,M4

D903-911 B30-2337-05 LED (YELLOW)

C1 CK73FB0J226M CHIP C 22UF MC3,4 CC73HCH1H101J CHIP C 100PF JC5,6 CK73HB1H102K CHIP C 1000PF KC7 CC73HCH1H101J CHIP C 100PF JC9 CK73HB1E104K CHIP C 0.10UF K

C10 CC73HCH1H680J CHIP C 68PF JC11 CK73HB1E104K CHIP C 0.10UF KC12 CK73FB1A106K CHIP C 10UF KC14 CK73HB1E104K CHIP C 0.10UF KC15 CK73FB1A106K CHIP C 10UF K

C16 CK73HB1H102K CHIP C 1000PF KC17 CK73HB1H103K CHIP C 0.010UF KC18 CK73HB1E104K CHIP C 0.10UF KC20,21 CK73HB1H471K CHIP C 470PF KC23 CK73HB1H471K CHIP C 470PF K

C25 C92-0863-05 CHIP TNTL 0.047UF 35WVC27 C92-0588-05 CHIP TNTL 1.5UF 16WVC28 CK73HB1H471K CHIP C 470PF KC29 CS77CA1V0R1M CHIP TNTL 0.1UF 35WVC34 CK73HB1H102K CHIP C 1000PF K

C35 CC73HCH1H820J CHIP C 82PF JC36 CC73HCH1H300J CHIP C 30PF JC38 CC73HCH1H100C CHIP C 10PF CC39 CC73HCH1H080B CHIP C 8.0PF BC41 CC73HCH1H0R5B CHIP C 0.5PF B

C42,43 CK73HB1H471K CHIP C 470PF KC45 CC73HCH1H010B CHIP C 1.0PF BC46 CC73HCH1H0R5B CHIP C 0.5PF BC48 CK73HB1H102K CHIP C 1000PF KC49 CC73HCH1H4R5B CHIP C 4.5PF B

C50 CC73HCH1H100C CHIP C 10PF CC51 CC73HCH1H050B CHIP C 5.0PF BC52 CC73HCH1H110G CHIP C 11PF GC53 CK73HB1H102K CHIP C 1000PF KC54 CC73HCH1H0R3B CHIP C 0.3PF B

C55 CC73HCH1H0R5B CHIP C 0.5PF BC56 CS77BB21C220M CHIP TNTL 22UF 16WVC57 CK73HB1H471K CHIP C 470PF KC58 CK73HB1H102K CHIP C 1000PF KC59 CK73HB1H471K CHIP C 470PF K

C60 CC73HCH1H060B CHIP C 6.0PF BC61 CC73HCH1H030B CHIP C 3.0PF BC62 CC73HCH1H020B CHIP C 2.0PF BC63 CK73HB1H102K CHIP C 1000PF KC64 CC73HCH1H221J CHIP C 220PF J

C65,66 CK73HB1H102K CHIP C 1000PF KC67 CC73HCH1H180J CHIP C 18PF JC68-70 CK73HB1H102K CHIP C 1000PF KC71 CC73HCH1H390J CHIP C 39PF JC72 CC73HCH1H180J CHIP C 18PF J

C306 CK73HB1H102K CHIP C 1000PF KC308 CK73HB1H122K CHIP C 1200PF KC309 CC73HCH1H060B CHIP C 6.0PF BC310 CC73HCH1H080B CHIP C 8.0PF BC312 CC73HCH1H120J CHIP C 12PF J

C318 CK73HB1H102K CHIP C 1000PF KC328 CC73HCH1H130J CHIP C 13PF JC329 CK73HB1H102K CHIP C 1000PF KC330 CC73HCH1H2R5B CHIP C 2.5PF BC331 CK73HB1E223K CHIP C 0.022UF K

C332 CC73HCH1H151J CHIP C 150PF JC333 CK73FB1A475K CHIP C 4.7UF KC334 CK73HB1H102K CHIP C 1000PF KC338 CK73HB1H102K CHIP C 1000PF KC340 CC73HCH1H221J CHIP C 220PF J

TM-281A

TX-RX UNIT (X57-8130-XX) -10: K -21: M2 -22: M3 -23: M4

TM-281A

13

PARTS LIST



nationNewparts


C342 CC73HCH1H101J CHIP C 100PF JC343 CK73HB1H102K CHIP C 1000PF KC344,345 CC73HCH1H101J CHIP C 100PF JC347 CK73HB1E104K CHIP C 0.10UF KC348 CK73HB1H102K CHIP C 1000PF K

C350 CK73HB1H102K CHIP C 1000PF KC354 CC73HCH1H220J CHIP C 22PF JC355 CC73HCH1H470J CHIP C 47PF JC356 CC73HCH1H220J CHIP C 22PF JC365 C93-0556-05 CHIP C 6.0PF D

C394 CK73HB1E104K CHIP C 0.10UF KC395 CK73HB1H102K CHIP C 1000PF KC397 CK73HB1H102K CHIP C 1000PF KC399 CK73HB1H103K CHIP C 0.010UF KC400,401 CK73HB1H102K CHIP C 1000PF K

C402 CK73HB1H103K CHIP C 0.010UF KC403 CC73GCH1H270J CHIP C 27PF JC404 C93-0563-05 CHIP C 18PF JC405,406 C93-0603-05 CHIP C 1000PF KC407 CK73HB1H102K CHIP C 1000PF K

C408 CC73GCH1H0R5B CHIP C 0.5PF BC409 CC73GCH1H040B CHIP C 4.0PF BC410 C93-0563-05 CHIP C 18PF JC412 CK73HB1H102K CHIP C 1000PF KC413 C93-0552-05 CHIP C 2.0PF C

C415 C93-0564-05 CHIP C 22PF JC416 CK73HB1H102K CHIP C 1000PF KC417 CC73GCH1H0R5B CHIP C 0.5PF BC418 CC73GCH1H040B CHIP C 4.0PF BC420 C93-0554-05 CHIP C 4.0PF C

C421 C93-0563-05 CHIP C 18PF JC422 CK73HB1H102K CHIP C 1000PF KC502 CK73HB1H103K CHIP C 0.010UF KC503 CC73HCH1H271J CHIP C 270PF JC504 CC73HCH1H560J CHIP C 56PF J

C505 CC73HCH1H680J CHIP C 68PF JC506 CC73HCH1H470J CHIP C 47PF JC507 CK73HB1H103K CHIP C 0.010UF KC508,509 CK73HB1A105K CHIP C 1.0UF KC510 CK73HB1H103K CHIP C 0.010UF K

C511 CK73FB1A106K CHIP C 10UF KC513 CC73HCH1H331J CHIP C 330PF JC514,515 CK73HB1E104K CHIP C 0.10UF KC516 CC73HCH1H331J CHIP C 330PF JC517 CK73HB1E104K CHIP C 0.10UF K

C518 CC73HCH1H101J CHIP C 100PF JC519 CK73FB1A106K CHIP C 10UF KC520 CK73HB1H102K CHIP C 1000PF KC521 CK73HB1H103K CHIP C 0.010UF KC522 CC73HCH1H270J CHIP C 27PF J

C523 CK73HB1E562K CHIP C 5600PF KC524 CK73HB1E104K CHIP C 0.10UF KC525 CK73HB1A224K CHIP C 0.22UF KC527 CC73HCH1H050B CHIP C 5.0PF BC528 CK73HB1H103K CHIP C 0.010UF K

C530 CK73HB1E223K CHIP C 0.022UF KC533 CC73HCH1H060B CHIP C 6.0PF BC534 CK73HB1A393K CHIP C 0.039UF KC535 CK73HB1H102K CHIP C 1000PF KC537 CC73HCH1H200J CHIP C 20PF J

C538 CK73HB1H103K CHIP C 0.010UF KC539 CC73HCH1H020B CHIP C 2.0PF BC541 CK73HB1H102K CHIP C 1000PF KC544 CK73HB1E104K CHIP C 0.10UF KC545 CC73HCH1H130J CHIP C 13PF J

C546 CC73HCH1H270J CHIP C 27PF JC547 CK73HB1H102K CHIP C 1000PF KC548 CK73HB1H103K CHIP C 0.010UF KC549,550 CK73HB1H102K CHIP C 1000PF KC551 CC73HCH1H101J CHIP C 100PF J

C552 CK73HB1H102K CHIP C 1000PF KC553 CC73HCH1H030B CHIP C 3.0PF BC554 CC73HCH1H240J CHIP C 24PF JC555 CC73HCH1H010B CHIP C 1.0PF BC556 CK73HB1H102K CHIP C 1000PF K

C557 CC73HCH1H050B CHIP C 5.0PF BC558 CC73HCH1H330J CHIP C 33PF JC559-562 CK73HB1H102K CHIP C 1000PF KC565-567 CK73HB1H102K CHIP C 1000PF KC568 CC73HCH1H101J CHIP C 100PF J

C569 CK73HB1H102K CHIP C 1000PF KC570 CC73HCH1H010B CHIP C 1.0PF BC571 CC73HCH1H180J CHIP C 18PF JC572 CK73HB1H102K CHIP C 1000PF KC573 CC73HCH1H040B CHIP C 4.0PF B

C574 CC73HCH1H1R5B CHIP C 1.5PF BC575 CK73HB1H102K CHIP C 1000PF KC576 CC73HCH1H180J CHIP C 18PF JC577 CK73HB1H102K CHIP C 1000PF KC578 CC73HCH1H390J CHIP C 39PF J

C579 CK73HB1H102K CHIP C 1000PF KC581 CC73HCH1H330J CHIP C 33PF JC582 CC73HCH1H010B CHIP C 1.0PF BC583 CC73HCH1H040B CHIP C 4.0PF BC584-587 CK73HB1E104K CHIP C 0.10UF K

C702,703 CK73HB1A473K CHIP C 0.047UF KC713 CK73HB1H102K CHIP C 1000PF KC718-720 CK73HB1H102K CHIP C 1000PF KC722 CK73HB1H102K CHIP C 1000PF KC724 CK73FB1A106K CHIP C 10UF K

C725 CK73HB1E104K CHIP C 0.10UF KC726 CK73HB1A393K CHIP C 0.039UF K K,M2,M3C726 CK73HB1A683K CHIP C 0.068UF K M4C727 CK73HB1H102K CHIP C 1000PF KC728 CK73GB0J225K CHIP C 2.2UF K

C729 CK73FB1A106K CHIP C 10UF KC731 CK73HB1H103K CHIP C 0.010UF KC732 CK73HB1H102K CHIP C 1000PF K K,M2,M3C732 CK73HB1H681K CHIP C 680PF K M4C733 CK73HB1E104K CHIP C 0.10UF K

C734 CK73HB1A393K CHIP C 0.039UF K M4C734 CK73HB1C223K CHIP C 0.022UF K K,M2,M3C735 CC73HCH1H680J CHIP C 68PF JC736 CK73FB1A106K CHIP C 10UF KC737 CK73HB1H102K CHIP C 1000PF K

C738 CK73HB1E104K CHIP C 0.10UF KC739 CK73HB1H102K CHIP C 1000PF KC740 CK73HB1E104K CHIP C 0.10UF KC742 CK73HB1H821K CHIP C 820PF KC743 CK73HB1H102K CHIP C 1000PF K

TM-281A

14


Newparts

PARTS LIST


Newparts


C744 CK73FB1A106K CHIP C 10UF KC745 CC73HCH1H390J CHIP C 39PF JC746 CK73HB1E104K CHIP C 0.10UF KC747 CK73FB1A106K CHIP C 10UF KC748 CK73HB1H102K CHIP C 1000PF K

C749 CK73HB1H103K CHIP C 0.010UF KC750 CC73HCH1H151J CHIP C 150PF JC751 CK73GB1A105K CHIP C 1.0UF KC752 CK73HB1H392K CHIP C 3900PF KC753 CK73HB1E472K CHIP C 4700PF K

C754 CK73FB1A106K CHIP C 10UF KC757,758 CK73FB1A106K CHIP C 10UF KC761 CK73HB1E104K CHIP C 0.10UF KC763 CC73HCH1H030B CHIP C 3.0PF BC764 CC73HCH1H050B CHIP C 5.0PF B

C765 CK73HB1H102K CHIP C 1000PF KC766 CC73HCH1H050B CHIP C 5.0PF BC767 CC73HCH1H030B CHIP C 3.0PF BC768 CK73HB1E104K CHIP C 0.10UF KC769 CK73HB1H102K CHIP C 1000PF K

C771 CK73HB1H102K CHIP C 1000PF KC772 CK73HB1E104K CHIP C 0.10UF KC774 CK73HB1H182K CHIP C 1800PF KC775 CK73HB1H392K CHIP C 3900PF KC776 CK73HB1H102K CHIP C 1000PF K

C777 CK73HB1A474K CHIP C 0.47UF KC778 CK73GB1A105K CHIP C 1.0UF KC779 CK73HB1E104K CHIP C 0.10UF KC781 CK73HB1H102K CHIP C 1000PF KC782 CK73HB1E104K CHIP C 0.10UF K

C783 CK73GB1A105K CHIP C 1.0UF KC784,785 CK73HB1H103K CHIP C 0.010UF KC786 CK73HB1A393K CHIP C 0.039UF KC787 CK73HB1E103K CHIP C 0.010UF KC788 CK73HB1H103K CHIP C 0.010UF K

C789,790 CK73HB1C333K CHIP C 0.033UF KC793 CK73HB1C183K CHIP C 0.018UF KC794 CK73HB1C822K CHIP C 8200PF KC795 CK73HB1A224K CHIP C 0.22UF KC796 CK73HB1H122K CHIP C 1200PF K

C797 CC73HCH1H390J CHIP C 39PF JC798 CK73HB1A224K CHIP C 0.22UF KC799 CK73GB0J475K CHIP C 4.7UF KC800,801 CK73HB1H102K CHIP C 1000PF KC802 CK73FB1A106K CHIP C 10UF K

C804 CK73HB1H103K CHIP C 0.010UF KC805 CK73HB1H102K CHIP C 1000PF KC806,807 CK73FB1A106K CHIP C 10UF KC808,809 CK73GB1A105K CHIP C 1.0UF KC810,811 CK73HB1E104K CHIP C 0.10UF K

C814 CK73FB1A106K CHIP C 10UF KC815 CK73HB1E104K CHIP C 0.10UF KC816 CK73HB1A224K CHIP C 0.22UF KC817 CK73HB1H102K CHIP C 1000PF KC818 CK73FB0J226M CHIP C 22UF M

C820-823 CK73HB1H102K CHIP C 1000PF KC824 CK73HB1E104K CHIP C 0.10UF KC825 CK73FB0J226M CHIP C 22UF MC826 CK73HB1H102K CHIP C 1000PF KC827 CK73FB1E475K CHIP C 4.7UF K

C828 CK73HB1H102K CHIP C 1000PF KC829 CK73HB1H103K CHIP C 0.010UF KC830 CK73HB1H102K CHIP C 1000PF KC831 CE32CL1C470M ELECTRO 47UF 16WVC832 CK73HB1E104K CHIP C 0.10UF K

C833-835 CK73HB1H102K CHIP C 1000PF KC836 C90-4129-05 ELECTRO 330UF 25WVC837 CK73HB1H103K CHIP C 0.010UF KC838 CK73HB1H102K CHIP C 1000PF KC839 C90-4129-05 ELECTRO 330UF 25WV

C840 CK73HB1E104K CHIP C 0.10UF KC844 CK73HB1H102K CHIP C 1000PF KC847 CK73HB1H102K CHIP C 1000PF KC848-851 CK73FB1A106K CHIP C 10UF KC853,854 CK73FB0J226M CHIP C 22UF M

C901-903 CK73HB1A104K CHIP C 0.10UF KC910 CK73HB1H102K CHIP C 1000PF KC912 CK73HB1H102K CHIP C 1000PF KC915 CC73HCH1H101J CHIP C 100PF JC916-918 CK73HB1H102K CHIP C 1000PF K

C920 CK73HB1H471K CHIP C 470PF KC921 CK73GB1A105K CHIP C 1.0UF KC922 CK73HB1H102K CHIP C 1000PF KC924 CK73HB1A104K CHIP C 0.10UF KC926,927 CC73HCH1H101J CHIP C 100PF J

C928 CK73HB1H681K CHIP C 680PF KC929 CK73HB1H102K CHIP C 1000PF KTC1 C05-0245-05 CERAMIC TRIMMER CAPACITOR (10PF)TC2 C05-0399-05 CERAMIC TRIMMER CAPACITOR (6PF)

CN501 E23-1325-05 TERMINALCN702 ✽ E40-6898-05 FLAT CABLE CONNECTOR (22P)CN901 ✽ E40-6897-05 FLAT CABLE CONNECTOR (22P)J701 2B E11-0425-05 3.5D PHONE JACK (EXT SP)J901 E58-0535-05 MODULAR JACK (MIC)

F701 F53-0327-15 FUSE (4A)

CD501 L79-1914-05 TUNING COILCF501 L72-1034-05 CERAMIC FILTER (450KHZ/WIDE)CF502 L72-0999-05 CERAMIC FILTER (450KHZ/NARROW)L1 ✽ L92-0622-15 CHIP FERRITEL2 L41-1005-08 SMALL FIXED INDUCTOR (10UH)

L3 ✽ L92-0621-15 CHIP FERRITEL5 ✽ L92-0620-15 CHIP FERRITEL6-9 L40-2785-92 SMALL FIXED INDUCTOR (270NH)L10 ✽ L92-0622-15 CHIP FERRITEL11 L41-4778-14 SMALL FIXED INDUCTOR (47NH)

L12 L41-3378-14 SMALL FIXED INDUCTOR (33NH)L13-16 L40-2702-86 SMALL FIXED INDUCTOR (27UH)L17 ✽ L92-0622-15 CHIP FERRITEL18 L40-3375-71 SMALL FIXED INDUCTOR (33NH)L19 ✽ L92-0622-15 CHIP FERRITE

L20 L40-1085-71 SMALL FIXED INDUCTOR (100NH)L21 L40-3975-71 SMALL FIXED INDUCTOR (39NH)L302 L40-2275-71 SMALL FIXED INDUCTOR (22NH)L305 L40-1075-71 SMALL FIXED INDUCTOR (10NH)L308 L40-8265-92 SMALL FIXED INDUCTOR (8.2NH)

L309 L40-1285-92 SMALL FIXED INDUCTOR (120NH)L310 L40-4775-92 SMALL FIXED INDUCTOR (47NH)L312-314 L92-0179-05 CHIP FERRITEL315,316 L34-4902-05 AIR-CORE COIL (9.5T)

TM-281A

15

PARTS LIST



nationNewparts


L317 L34-1039-05 AIR-CORE COIL (1.5T)L318-320 L34-4903-05 AIR-CORE COIL (5T)L502-504 L40-3381-86 SMALL FIXED INDUCTOR (0.33UH)L505 L40-3391-86 SMALL FIXED INDUCTOR (3.3UH)L506,507 L41-3988-14 SMALL FIXED INDUCTOR (390NH)

L508 L40-4775-71 SMALL FIXED INDUCTOR (47NH)L510,511 L41-6878-14 SMALL FIXED INDUCTOR (68NH)L512 L41-3385-14 SMALL FIXED INDUCTOR (330NH)L514,515 L41-6878-14 SMALL FIXED INDUCTOR (68NH)L701,702 ✽ L92-0622-15 CHIP FERRITE

L901 ✽ L92-0621-15 CHIP FERRITEX1 L77-1944-05 TCXO (16.8MHZ)X701 ✽ L78-1427-05 RESONATOR (8.00MHZ)XF501 L71-0655-05 MCF (49.95MHZ)

CP901 RK75GB1J102J CHIP-COM 1.0K J 1/16WR1 RK73HB1J104J CHIP R 100K J 1/16WR2-4 RK73HB1J102J CHIP R 1.0K J 1/16WR5 RK73HB1J103J CHIP R 10K J 1/16WR6 RK73HB1J152J CHIP R 1.5K J 1/16W

R7 RK73HB1J100J CHIP R 10 J 1/16WR8 RK73HB1J104J CHIP R 100K J 1/16WR9 RK73HB1J471J CHIP R 470 J 1/16WR10 RK73HB1J822J CHIP R 8.2K J 1/16WR11 RK73HB1J103J CHIP R 10K J 1/16W

R12 RK73HB1J562J CHIP R 5.6K J 1/16WR13 RK73HB1J103J CHIP R 10K J 1/16WR15 RK73HB1J102J CHIP R 1.0K J 1/16WR16 RK73HB1J000J CHIP R 0.0 J 1/16WR17 RK73HB1J471J CHIP R 470 J 1/16W

R18 RK73HB1J000J CHIP R 0.0 J 1/16WR19 RK73HB1J272J CHIP R 2.7K J 1/16WR20 RK73HB1J102J CHIP R 1.0K J 1/16WR21 RK73HB1J152J CHIP R 1.5K J 1/16WR22 RK73HB1J223J CHIP R 22K J 1/16W

R23 RK73HB1J103J CHIP R 10K J 1/16WR24 RK73HB1J104J CHIP R 100K J 1/16WR25-27 RK73HB1J473J CHIP R 47K J 1/16WR28 RK73HB1J221J CHIP R 220 J 1/16WR29 RK73HB1J471J CHIP R 470 J 1/16W

R30 RK73HB1J104J CHIP R 100K J 1/16WR31 RK73HB1J472J CHIP R 4.7K J 1/16WR32 RK73HB1J221J CHIP R 220 J 1/16WR33 RK73HB1J101J CHIP R 100 J 1/16WR34 RK73HB1J102J CHIP R 1.0K J 1/16W

R35 RK73HB1J124J CHIP R 120K J 1/16WR37 RK73HB1J000J CHIP R 0.0 J 1/16WR38 RK73HB1J101J CHIP R 100 J 1/16WR40 RK73HB1J102J CHIP R 1.0K J 1/16WR41 RK73HB1J103J CHIP R 10K J 1/16W

R42 RK73HB1J822J CHIP R 8.2K J 1/16WR43-45 RK73HB1J101J CHIP R 100 J 1/16WR46 RK73HB1J222J CHIP R 2.2K J 1/16WR304 RK73HB1J102J CHIP R 1.0K J 1/16WR307 RK73HB1J000J CHIP R 0.0 J 1/16W

R312 RK73HB1J472J CHIP R 4.7K J 1/16WR314 RK73HB1J223J CHIP R 22K J 1/16WR326 RK73HB1J123J CHIP R 12K J 1/16WR331,332 RK73HB1J100J CHIP R 10 J 1/16WR333,334 RK73HB1J101J CHIP R 100 J 1/16W

R336 RK73HB1J470J CHIP R 47 J 1/16WR337 RK73HB1J101J CHIP R 100 J 1/16WR338 RK73HB1J154J CHIP R 150K J 1/16WR339 RK73HB1J103J CHIP R 10K J 1/16WR340 RK73HB1J223J CHIP R 22K J 1/16W

R341 RK73HB1J154J CHIP R 150K J 1/16WR342 RK73HB1J152J CHIP R 1.5K J 1/16WR344,345 RK73HB1J104J CHIP R 100K J 1/16WR346 RK73EB2E221J CHIP R 220 J 1/4WR347 RK73HB1J152J CHIP R 1.5K J 1/16W

R348 RK73HB1J153J CHIP R 15K J 1/16WR349 RK73EB2E221J CHIP R 220 J 1/4WR350 RK73HB1J100J CHIP R 10 J 1/16WR351 RK73HB1J473J CHIP R 47K J 1/16WR377,378 RK73HB1J103J CHIP R 10K J 1/16W

R380 2B R92-1061-05 JUMPER REST 0 OHMR501 RK73HB1J124J CHIP R 120K J 1/16WR502 RK73HB1J101J CHIP R 100 J 1/16WR503 RK73HB1J682J CHIP R 6.8K J 1/16WR504-507 RK73HB1J103J CHIP R 10K J 1/16W

R508 RK73HB1J682J CHIP R 6.8K J 1/16WR509 RK73HB1J000J CHIP R 0.0 J 1/16WR510 RK73HB1J102J CHIP R 1.0K J 1/16WR511 RK73HB1J223J CHIP R 22K J 1/16WR512 RK73HB1J564J CHIP R 560K J 1/16W

R514,515 RK73HB1J472J CHIP R 4.7K J 1/16WR517 RK73HB1J182J CHIP R 1.8K J 1/16WR519 RK73HB1J103J CHIP R 10K J 1/16WR520 RK73HB1J474J CHIP R 470K J 1/16WR521 RK73HB1J102J CHIP R 1.0K J 1/16W

R522 RK73HB1J101J CHIP R 100 J 1/16WR523 RK73HB1J000J CHIP R 0.0 J 1/16WR524 RK73HB1J394J CHIP R 390K J 1/16WR525 RK73HB1J271J CHIP R 270 J 1/16WR526 RK73HB1J000J CHIP R 0.0 J 1/16W

R527 RK73HB1J474J CHIP R 470K J 1/16WR528 RK73HB1J102J CHIP R 1.0K J 1/16WR529 RK73HB1J394J CHIP R 390K J 1/16WR531 RK73HB1J101J CHIP R 100 J 1/16WR532 RK73HB1J000J CHIP R 0.0 J 1/16W

R534 RK73HB1J221J CHIP R 220 J 1/16WR535 RK73HB1J000J CHIP R 0.0 J 1/16WR536 RK73HB1J561J CHIP R 560 J 1/16WR537 RK73HB1J474J CHIP R 470K J 1/16WR538 RK73HB1J224J CHIP R 220K J 1/16W

R539 RK73HB1J181J CHIP R 180 J 1/16WR540 RK73HB1J473J CHIP R 47K J 1/16WR541 RK73HB1J333J CHIP R 33K J 1/16WR542 RK73HB1J000J CHIP R 0.0 J 1/16WR543,544 RK73HB1J104J CHIP R 100K J 1/16W

R545 RK73HB1J102J CHIP R 1.0K J 1/16WR546 RK73HB1J101J CHIP R 100 J 1/16WR547 RK73HB1J000J CHIP R 0.0 J 1/16WR549 RK73HB1J151J CHIP R 150 J 1/16WR550 RK73HB1J103J CHIP R 10K J 1/16W

R551 RK73HB1J104J CHIP R 100K J 1/16WR552 RK73HB1J473J CHIP R 47K J 1/16WR553 RK73HB1J273J CHIP R 27K J 1/16WR554,555 RK73HB1J104J CHIP R 100K J 1/16WR556 RK73FB2B000J CHIP R 0.0 J 1/8W

TM-281A

16


Newparts

PARTS LIST


Newparts


R557 RK73HB1J104J CHIP R 100K J 1/16WR558 RK73HB1J473J CHIP R 47K J 1/16WR559 RK73HB1J273J CHIP R 27K J 1/16WR560 RK73HB1J000J CHIP R 0.0 J 1/16WR701 RK73HB1J000J CHIP R 0.0 J 1/16W

R702,703 RK73HB1J101J CHIP R 100 J 1/16WR704,705 RK73HB1J102J CHIP R 1.0K J 1/16WR706 RK73HB1J000J CHIP R 0.0 J 1/16WR707 RK73HB1J102J CHIP R 1.0K J 1/16WR708 RK73HB1J000J CHIP R 0.0 J 1/16W

R710,711 RK73GH2A153D CHIP R 15K D 1/10WR713 RK73HB1J821J CHIP R 820 J 1/16WR714 RK73HB1J104J CHIP R 100K J 1/16WR715 RK73HB1J681J CHIP R 680 J 1/16WR716 RK73HB1J101J CHIP R 100 J 1/16W

R717 RK73HB1J103J CHIP R 10K J 1/16W M4R717 RK73HB1J183J CHIP R 18K J 1/16W K,M2,M3R718 RK73HB1J152J CHIP R 1.5K J 1/16WR719 RK73HB1J122J CHIP R 1.2K J 1/16WR721 RK73HB1J105J CHIP R 1.0M J 1/16W M4

R721 RK73HB1J754J CHIP R 750K J 1/16W K,M2,M3R722 RK73HB1J152J CHIP R 1.5K J 1/16WR723 RK73HB1J912J CHIP R 9.1K J 1/16WR724 RK73HB1J682J CHIP R 6.8K J 1/16WR725 ✽ RK73HB1J244J CHIP R 240K J 1/16W

R726 RK73HB1J183J CHIP R 18K J 1/16WR727 RK73HB1J334J CHIP R 330K J 1/16WR728 RK73HB1J823J CHIP R 82K J 1/16WR729 RK73HB1J124J CHIP R 120K J 1/16WR730 RK73HB1J823J CHIP R 82K J 1/16W

R733 RK73HB1J684J CHIP R 680K J 1/16WR734 RK73HB1J224J CHIP R 220K J 1/16WR735 RK73HB1J274J CHIP R 270K J 1/16WR736,737 RK73HB1J103J CHIP R 10K J 1/16WR738 RK73HB1J683J CHIP R 68K J 1/16W

R739 RK73HB1J223J CHIP R 22K J 1/16WR740 RK73HB1J683J CHIP R 68K J 1/16WR741 RK73HB1J154J CHIP R 150K J 1/16WR742 RK73HB1J124J CHIP R 120K J 1/16WR743-745 RK73HB1J102J CHIP R 1.0K J 1/16W

R746 RK73HB1J823J CHIP R 82K J 1/16WR747 RK73HB1J104J CHIP R 100K J 1/16WR748 RK73HB1J223J CHIP R 22K J 1/16WR749 RK73HB1J562J CHIP R 5.6K J 1/16WR750,751 RK73HB1J102J CHIP R 1.0K J 1/16W

R752-755 RK73HB1J473J CHIP R 47K J 1/16WR756 RK73HB1J103J CHIP R 10K J 1/16WR757 RK73HB1J473J CHIP R 47K J 1/16WR758 RK73HB1J000J CHIP R 0.0 J 1/16WR759 RK73HB1J102J CHIP R 1.0K J 1/16W

R760,761 RK73HB1J473J CHIP R 47K J 1/16WR762 RK73HB1J103J CHIP R 10K J 1/16WR763 RK73HB1J000J CHIP R 0.0 J 1/16WR764 RK73GB2A000J CHIP R 0.0 J 1/10WR765 RK73HB1J102J CHIP R 1.0K J 1/16W

R766-768 RK73GB2A000J CHIP R 0.0 J 1/10W KR767,768 RK73GB2A000J CHIP R 0.0 J 1/10W M4R768 RK73GB2A000J CHIP R 0.0 J 1/10W M3R769 RK73HB1J102J CHIP R 1.0K J 1/16WR770 RK73HB1J000J CHIP R 0.0 J 1/16W

R771 RK73HB1J473J CHIP R 47K J 1/16WR772 RK73HB1J103J CHIP R 10K J 1/16WR773 RK73HB1J000J CHIP R 0.0 J 1/16WR774 RK73HB1J472J CHIP R 4.7K J 1/16WR775 RK73HB1J102J CHIP R 1.0K J 1/16W

R776 RK73HB1J152J CHIP R 1.5K J 1/16WR777,778 RK73HB1J103J CHIP R 10K J 1/16WR779-781 RK73HB1J473J CHIP R 47K J 1/16WR782 RK73HB1J102J CHIP R 1.0K J 1/16WR783 RK73HB1J393J CHIP R 39K J 1/16W

R784 RK73HB1J153J CHIP R 15K J 1/16WR785 RK73HB1J123J CHIP R 12K J 1/16WR786 RK73HB1J154J CHIP R 150K J 1/16WR787 RK73HB1J124J CHIP R 120K J 1/16WR789 RK73HB1J224J CHIP R 220K J 1/16W

R790 RK73HB1J123J CHIP R 12K J 1/16WR791 RK73GH2A124D CHIP R 120K D 1/10WR792 RK73GH2A562D CHIP R 5.6K D 1/10WR793 RK73GH2A913D CHIP R 91K D 1/10WR794 RK73HB1J124J CHIP R 120K J 1/16W

R795 RK73GH2A562D CHIP R 5.6K D 1/10WR796 RK73HB1J183J CHIP R 18K J 1/16WR797 RK73HB1J272J CHIP R 2.7K J 1/16WR799 RK73HB1J474J CHIP R 470K J 1/16WR800 RK73HB1J562J CHIP R 5.6K J 1/16W

R801 RK73HB1J000J CHIP R 0.0 J 1/16WR802 RK73HB1J473J CHIP R 47K J 1/16WR803 RK73HB1J392J CHIP R 3.9K J 1/16WR804 RK73HB1J123J CHIP R 12K J 1/16WR805 RK73HB1J562J CHIP R 5.6K J 1/16W

R806 RK73HB1J272J CHIP R 2.7K J 1/16WR807 RK73HB1J105J CHIP R 1.0M J 1/16WR808 RK73HB1J153J CHIP R 15K J 1/16WR809 RK73HB1J471J CHIP R 470 J 1/16WR810 RK73HB1J153J CHIP R 15K J 1/16W

R811 RK73HB1J000J CHIP R 0.0 J 1/16WR812 RK73HB1J222J CHIP R 2.2K J 1/16WR813 RK73HB1J473J CHIP R 47K J 1/16WR814 RK73HB1J152J CHIP R 1.5K J 1/16WR815 RK73HB1J472J CHIP R 4.7K J 1/16W

R816,817 RK73HB1J473J CHIP R 47K J 1/16WR818 RK73HB1J683J CHIP R 68K J 1/16WR819 RK73HB1J123J CHIP R 12K J 1/16WR820 RK73HB1J221J CHIP R 220 J 1/16WR821 RK73HB1J473J CHIP R 47K J 1/16W

R822 RK73HB1J334J CHIP R 330K J 1/16WR823 RK73HB1J391J CHIP R 390 J 1/16WR824 RK73HB1J474J CHIP R 470K J 1/16WR825 RK73HB1J394J CHIP R 390K J 1/16WR826 RK73HB1J473J CHIP R 47K J 1/16W

R827 RK73HB1J334J CHIP R 330K J 1/16WR828,829 RK73HB1J000J CHIP R 0.0 J 1/16WR830-833 RK73FB2B000J CHIP R 0.0 J 1/8WR834 RK73HB1J102J CHIP R 1.0K J 1/16WR835 RK73HB1J000J CHIP R 0.0 J 1/16W K

R836 RK73HB1J000J CHIP R 0.0 J 1/16W M2R837 RK73HB1J000J CHIP R 0.0 J 1/16W M3R838 RK73HB1J000J CHIP R 0.0 J 1/16W M4R841,842 RK73HB1J103J CHIP R 10K J 1/16WR843 RK73HB1J473J CHIP R 47K J 1/16W

TM-281A

17

PARTS LIST



nationNewparts


R844 RK73HB1J103J CHIP R 10K J 1/16WR901 RK73HB1J000J CHIP R 0.0 J 1/16WR902,903 RK73HB1J472J CHIP R 4.7K J 1/16WR904-906 RK73HB1J000J CHIP R 0.0 J 1/16WR908 RK73HB1J101J CHIP R 100 J 1/16W

R909 RK73HB1J102J CHIP R 1.0K J 1/16WR910-912 RK73HB1J103J CHIP R 10K J 1/16WR913 RK73HB1J563J CHIP R 56K J 1/16WR914 RK73HB1J102J CHIP R 1.0K J 1/16WR915 RK73HB1J152J CHIP R 1.5K J 1/16W

R916 RK73HB1J183J CHIP R 18K J 1/16WR917 RK73HB1J392J CHIP R 3.9K J 1/16WR918 RK73HB1J821J CHIP R 820 J 1/16WR919 RK73HB1J272J CHIP R 2.7K J 1/16WR920 RK73HB1J183J CHIP R 18K J 1/16W

R921 RK73HB1J104J CHIP R 100K J 1/16WR922-924 RK73HB1J331J CHIP R 330 J 1/16WVR901 R31-0662-05 VARIABLE RESISTOR

D1 HZU5ALL DIODED2 DA2S101 DIODED3-6 ✽ HVC359 VARIABLE CAPACITANCE DIODED7 1SV278F VARIABLE CAPACITANCE DIODED8 DA2S101 DIODE

D9,10 HSC277 DIODED301 UDZW5.1(B) ZENER DIODED305 DA2S101 DIODED306,307 L407CDB DIODE (50V/1W)D309 ✽ JDP2S12CR DIODE

D311 ✽ JDP2S12CR DIODED312 RB521S-30 DIODED313,314 HSB88AS-E DIODED316 RB521S-30 DIODED501,502 MC2858-T111 DIODE

D503 HSB88AS-E DIODED504 DA2S101 DIODED505,506 1SV325F VARIABLE CAPACITANCE DIODED508,509 1SV325F VARIABLE CAPACITANCE DIODED702 MC2850 DIODE

D704-706 MC2850 DIODED708 DA2S101 DIODED709 1SS372F DIODED710 DA2S101 DIODED711 1SS372F DIODE

D712 UDZW18(B) ZENER DIODED714 Z5W27V SURGE ABSORBERD901 1SS355 DIODED902 UDZW6.2(B) ZENER DIODEIC1 MB15A02PFV2E1 MOS-IC

IC2 UPB1509GV BI-POLAR ICIC302 1B ✽ RA60H1317M231 MOS-IC (POWER MODULE)IC303 NJM12904RB1 MOS-ICIC501 UA31136L MOS-ICIC703 NJM2100V-ZB MOS-IC

IC704 NJM12904RB1 MOS-ICIC705 M62363FP-F MOS-ICIC706 BA10324AFV MOS-ICIC707 30622MEP540GU MICROCONTROLLER ICIC708 EX24064ASAS0A ROM IC

IC709 BA10324AFV MOS-IC

IC710 XC6209B502P-G MOS-ICIC711 ✽ TA7808F-NQ ANALOGUE ICIC712 XC61CN4002MR MOS-ICIC713 TA7805F-NQ MOS-ICIC714 ✽ XC61CN3202MR MOS-IC

IC715 1A LA4600 BI-POLAR ICIC901 PT6554LQ MOS-ICQ1 2SA1832(GR)F TRANSISTORQ2 2SC4738(GR)F TRANSISTORQ3 2SC4649(N,P) TRANSISTOR

Q4 MCH3914(7)-H FETQ5 2SJ347F FETQ6 MCH3914(7)-H FETQ7 UMC4N TRANSISTORQ8 KTC4075E(Y,GR) TRANSISTOR

Q9,10 2SC5108(Y)F TRANSISTORQ303 RD00HVS1-T113 FETQ501 KTC4080E-P TRANSISTORQ502 2SC4617(S) TRANSISTORQ503 KTC4080E-P TRANSISTOR

Q504 3SK318 FETQ505 3SK294-FP FETQ506 2SK1830F FETQ701-703 2SC4919-S TRANSISTORQ704,705 2SK3019 FET

Q706 2SC2412K TRANSISTORQ707-709 RT1N141U-T111 TRANSISTORQ710,711 2SB1694 TRANSISTORQ712 DTC363EU DIGITAL TRANSISTORQ713 RT1N141U-T111 TRANSISTOR

Q714 2SJ645 FETQ715 RT1N141U-T111 TRANSISTORQ901 RT1P141U-T111 TRANSISTORQ902 RT1N141U-T111 TRANSISTORQ903 2SB1132(Q,R) TRANSISTOR

Q904 UMG3N TRANSISTORTH501 NCP18WM474J0S THERMISTORTH702,703 NCP18WF104J03 THERMISTOR

S901 W02-3704-05 ENCODER

If a part reference number is listed in a shaded box, that part does not come with the PCB.

TM-281A

18

EXPLODED VIEW

Parts with the exploded numbers larger than 700 are not supplied.If a part reference number is listed in a box on the exploded view of the PCB, that part does not come with the PCB. These parts must be ordered separately.

BA

3

2

1

1

10

2

11

13

15

IC302

R380

IC715

J701

B

BB

B

D Dx2

Dx4X57 A/2

X57 A/2

TX-RX unit (B/2)Display section

TX-RX unit (A/2)TX-RX section Dx2

D

D

D

D

A

A

700

702

703

A : N35-2604-43B : N67-3008-48C : N80-2008-48D : N87-2608-48

3

5

6

12

19

19

16

2027

30

31

32

36

C

C

TM-281A

19

PACKING

Parts with the exploded numbers larger than 700 are not supplied.

3

2

1

DC

37 Microphone (T91-0624-65): M2 (T91-0641-75): K,M3,M4

M2K,M3,M4

14 DC cord (E30-7744-05)

18 Fuse (Blade type) 15A (F52-0024-05)

26 Holder (MIC) (J19-1584-15)

34 Screw set (N99-2082-05)

28 Bracket (J29-0726-03)

711 Pamphlet

712 Warranty card: K

7 Instruction manual (B62-2347-10): K,M2 (B62-2348-10): M3 (B62-2349-10): M4

713 Protection bag

22 Packing fixture (H12-4330-02)

23 Packing fixture (H12-4331-02)

24 Item carton case (H52-2503-02): K

710 Protection bag

TM-281A

20

Measuring Equipment for Alignment

1. Digital voltmeter (DVM) Input impedance: High

2. RF voltmeter (RF VM) Input impedance: 1MΩ or more, 2pF or less Voltage range: Full scale=10mV to 300V Measurable frequency range: Up to 200MHz

3. Frequency counter (f.counter) Input sensitivity: About 50mV Frequency range: 10Hz to 1000MHz

4. DC power supply Voltage: Variable in the range 9 to 17V Current: 14A or more

5. Power meter Measurement power: 65W, 25W Impedance: 50Ω Measurable frequency: Up to 200MHz

6. AF voltmeter (AF VM) Input impedance: 1MΩ or more Voltage range: Full scale=1mV to 30V Measurable frequency range: 50Hz to 10kHz

7. AF generator (AG) Output frequency: 100Hz to 10kHz Output voltage: 0.5mV to 1V

8. Linear detector Measurable frequency: Up to 200MHz

9. Spectrum analyzer

Measuring range: 10kHz to 1GHz or more

10. Oscilloscope High sensitivity with horizontal input terminal

11. Standard signal generator (SSG) Frequency range: 136 to 174MHz Output: –133dBm (0.05µV) to greater than –13dBm

(50mV)

12. Dummy load (for AF) 8Ω, about 5W

13. Sweep generator The sweep generator must be able to sweep the fre-

quency range of 30 to 300MHz.

14. Tracking generator Output voltage: 100mV or more

Preparation

• Set the controls and switches to the positions listed be-low unless otherwise specifi ed.

Volume control : Fully counterclockwise Power switch : OFF

CMHOOKMICMEPTTGND8CMBL

Microphone socket

(as viewed from the front of the transceiver)

• To protect the signal generator, never connect the micro-phone to the microphone socket when the receiver sec-tion is adjusted.

• Before the power cord is connected, make sure the pow-er switch is off.

• Without specifi cation of SSG, standard modulation is ap-plied (MOD: 1kHz, DEV: ±3kHz)

ADJUSTMENT

TM-281A

21

Adjustment Mode

This mode is used to replace or readjust the EEPROM (IC708).In Adjustment Mode, the transceiver can be adjusted us-

ing its panel keys.

■ Items that can be adjusted in Adjustment Mode 1. Frequency Tune 8. DTMF Fine Deviation 2. Transmit High Power *1 9. Band Pass Tuning *3 3. Transmit Low Power *1 10. Squelch Tight *4 4. DCS Balance *2 11. Squelch Open *4 5. Max Deviation *2 12. S-Meter S1 Level 6. CTCSS Fine Deviation *2 13. S-Meter Full Level 7. DCS Fine Deviation *2

Note:*1: Adjusted in 5 points in the transmission operating fre-

quency range.*2: Adjusted in 3 points for the Wide bandwidth in the

transmission operating frequency range. Adjusted in 1 point for the Narrow bandwidth.*3: Adjusted in 3 points in the reception operating frequen-

cy range. *4: Adjusted in 3 points for the Wide bandwidth in the re-

ception operating frequency range. Adjusted in 1 point for the Narrow bandwidth.

■ How to Enter Adjustment ModeTo perform adjustments with the transceiver panel keys,

the transceiver must be set to “Adjustment Mode”.While shorting two lands (GND, ADJ) on the component

side of the TX-RX unit (A/2) using a pair of tweezers or simi-lar tool, turn the transceiver power ON to enter Adjustment Mode.

ADJ

Short these two lands

GND

TX-RX UNIT (X57-8130-XX) (A/2): TX-RX sectionComponent side view

■ LCD Display in Adjustment ModeExample of Frequency Tune. See “Table 1” for an LCD

display list.The value stored in the EEPROM (00~FF)

Adjustment item Current adjustment value (00~FF)

Blink in adjustment mode

■ Panel Key Operation Method in Adjustment Mode

q Power switch/Volume controlw When the Tuning control is pressed once, the adjustment

value display blinks. (Select an adjustment item with the [VFO] or [MR] key before performing the operation. It cannot be performed while transmitting.)

When the Tuning control is rotated while the adjustment display is blinking, the adjustment value changes. (Adjust transmission items while transmitting.)

When the Tuning control is pressed again, the adjustment value stops blinking and lights, and the adjustment value is saved in the memory of the transceiver. (For transmis-sion item adjustment, enter receive mode before per-forming the operation.)

e Changing between adjustment value display and frequen-cy display

The display changes as follows: Adjustment value display → Transmit frequency display → Receive frequency dis-play → Adjustment value display.

The frequency for adjustment can be confi rmed.r Moves the adjustment item backward. (If it is operated

when a frequency is displayed, the adjustment item dis-play returns.)

t Moves the adjustment item forward. (If it is operated when a frequency is displayed, the adjustment item dis-play returns.)

y If it is pressed before determining the adjustment value, the adjustment value of the Adjustment item returns to its original value.

u Not used in Adjustment Mode.

Note:If Max Power for transmission is low, check the DC cable.If the DC cable connector has poor contact due to rust or

stain, a voltage drop may occur frequently and correct trans-mission power may not be supplied.

In this case, polish the DC cable connector. If the problem still persists, replace the DC cable with a new one.

ADJUSTMENT

TM-281A

22

No. Adjustment ItemAdjustment

Frequency PointDisplay Note

Transmit

(MHz)

Receive

(MHz)Signaling

1 Frequency Tune Center 155.100 155.050

2 TX High Power

Low

“H” icon appear

136.100 136.050

Low’ 142.100 142.050

Center 150.100 150.050

High’ 156.100 156.050

High 173.900 173.950

3 TX Low Power

Low

“L” icon appear

136.100 136.050

Low’ 142.100 142.050

Center 150.100 150.050

High’ 156.100 156.050

High 173.900 173.950

4 DCS Balance

Low

“DCS” icon appear

136.100 136.050

DCS : 023NCenter 155.100 155.050

High 173.900 173.950

5 DCS Balance (Narrow) Center “DCS” and “N” icon appear 155.100 155.050

6 Max Deviation

Low 136.100 136.050

Center 155.100 155.050

High 173.900 173.950

7 Max Deviation (Narrow) Center “N” icon appear 155.100 155.050

8 CTCSS Fine Deviation

Low

“CT” icon appear

136.100 136.050

CTCSS : 88.5HzCenter 155.100 155.050

High 173.900 173.950

9 CTCSS Fine Deviation (Narrow) Center “CT” and “N” icon appear 155.100 155.050

10 DCS Fine Deviation

Low

“DCS” icon appear

136.100 136.050

DCS : 023NCenter 155.100 155.050

High 173.900 173.950

11 DCS Fine Deviation (Narrow) Center “DCS” and “N” icons appear 155.100 155.050

12 DTMF Fine Deviation Center 155.100 155.050DTMF : 9

13 DTMF Fine Deviation (Narrow) Center “N” icon appear 155.100 155.050

14 Band Pass Tuning

Low

“BUSY” icon appear

136.100 136.050

Center 155.100 155.050

High 173.900 173.950

15 Squelch Tight

Low 136.100 136.050

Center 146.100 146.050

High 173.900 173.950

16 Squelch Tight (Narrow) Center “N” icon appear 146.100 146.050

17 Squelch Open

Low 136.100 136.050

Center 146.100 146.050

High 173.900 173.950

18 Squelch Open (Narrow) Center “N” icon appear 146.100 146.050

19 S-Meter S1 Level Center 146.100 146.050

20 S-Meter Full Level Center 146.100 146.050

Table 1 Adjustment items, display and test frequency list

ADJUSTMENT

TM-281A

23

Adjustment Points

FB +B

ADJGND

ANT

GND BPF

CV

GND

TX-RX UNIT (X57-8130-XX) (A/2): TX-RX sectionComponent side

TC1 TC2

CV

J701EXT. SP

TX-RX UNIT (X57-8130-XX) (A/2): TX-RX sectionFoil side

Ref –10 dBmPeakLog10dB/

Atten 5 dBMkr1 136.1 MHz

–24.78 dBm

W1 S2S3 FC

AA

Center 136.1 MHz#Res BW 100 kHz VBW 100 kHz

Span 200 MHzSweep 50 ms (401 pts)

1

Center136.0500000 MHz

Fig. 1



–21.89 dBm

W1 S2S3 FC

AA



1


Fig. 2



–23.85 dBm

W1 S2S3 FC

AA



1


Fig. 3

ADJUSTMENT

TM-281A

24

ADJUSTMENT

Common Section

Item Condition

Measurement Adjustment

Specifi cations / RemarksTest-equipment

Unit Terminal Unit Parts Method

1. Setting 1) Power supply voltage DC power supply terminal : 13.8V

2. All LCD segments

light check and full reset

1) All LCD segments light check Turn the transceiver power ON by pressing the power switch while [F] key is

pressed. While the [F] key is pressed, all LCD segments light.2) Full reset After confi rming that all LCD segments have lighted described in the step 1

above, release the [F] key, “FL.RST?” appears on the display. Press the [F] key, “SURE ?” appears on the display. Press the [F] key again to perform the full reset.

Note:

When you do not want to remove data such as memory channel data, save the data using the MCP-1A (Memory control program) before performing the full reset, then write the data to the transceiver after performing the adjust-ment.

Confi rm that all LCD segments light.

3. VCO Lock voltage

RX

1) Frequency: 173.950MHz DVM TX-RX(A/2)

CV TX-RX(A/2)

TC2 5.5V ±0.1V

2) Frequency: 136.050MHz Check 0.5V or more

TX 3) Frequency: 173.900MHz4) Transmit

TX-RX(A/2)

TC1 5.5V ±0.1V

5) Frequency: 136.100MHz6) Transmit

Check 0.5V or more

Transmitter Section (Refer to the Table 1 on page 22 for the frequencies which will apply in the adjustment mode.)

Item Condition




1. Frequency 1) Adj item: [FRQ.] Adjust: [✳✳]2) Transmit

f. counter Rear panel

ANT Front panel

Tuning control

Write 155.100MHz±50Hz

2. High power [Low]

1) Adj item: [HPL .] Adjust: [✳✳]2) Transmit

Power meter

50W±1W

[Low’] 3) Adj item: [HPL1.] Adjust: [✳✳]4) Transmit

65W±1W

[Center] 5) Adj item: [HPC .] Adjust: [✳✳]6) Transmit

65W±1W

[High’] 7) Adj item: [HPH1.] Adjust: [✳✳]8) Transmit

50W±1W

[High] 9) Adj item: [HPH .] Adjust: [✳✳]10) Transmit

50W±1W

TM-281A

25

ADJUSTMENT

Item Condition




3. Low power [Low]

1) Adj item: [LPL .] Adjust: [✳✳]2) Transmit

Power meter

Rear panel

ANT Front panel

Tuning control

Write 25W±1W

[Low’] 3) Adj item: [LPL1.] Adjust: [✳✳]4) Transmit

[Center] 5) Adj item: [LPC .] Adjust: [✳✳]6) Transmit

[High’] 7) Adj item: [LPH1.] Adjust: [✳✳]8) Transmit

[High] 9) Adj item: [LPH .] Adjust: [✳✳]10) Transmit

4. DCS balance

• Wide [Low]

1) Adj item: [BALL.] Adjust: [✳✳] Detector: +P HOLD LPF: 3kHz HPF: OFF De-emphasis: OFF2) Transmit

Linear detectorOscilloscope

By turning the Tun-ing control, adjust the modulation wave until it becomes the square wave.

[Center] 3) Adj item: [BALC.] Adjust: [✳✳]4) Transmit

[High] 5) Adj item: [BALH.] Adjust: [✳✳]6) Transmit

• Narrow [Center]

7) Adj item: [BALC.] (“N” icon appear) Adjust: [✳✳]8) Transmit

5. MAX devia-tion

• Wide [Low]

1) Adj item: [MAXL.] Adjust: [✳✳] AG: 1kHz/54mV K,M2,M3

AG: 1kHz/24mV M4

Detector: +P, –P LPF: 15kHz HPF: OFF De-emphasis: OFF2) Transmit


AGAF VM

Rear panel

Front panel

ANT

MIC

Write 4.0kHz±0.1kHz (According to the larger +P, –P)

[Center] 3) Adj item: [MAXC.] Adjust: [✳✳]4) Transmit

[High] 5) Adj item: [MAXH.] Adjust: [✳✳]6) Transmit

• Narrow [Center]

7) Adj item: [MAXC.] (“N” icon appear) Adjust: [✳✳]8) Transmit

2.0kHz±0.05kHz (According to the larger +P, –P)

TM-281A

26

ADJUSTMENT

Item Condition




6. MIC sensi-tivity

(Narrow)

1) Frequency: 155.100MHz AG: 1kHz/5.4mV K,M2,M3

AG: 1kHz/2.4mV M4

Detector: P-P/2 LPF: 15kHz HPF: OFF De-emphasis: OFF2) Transmit


AGAF VM

Rear panel

Front panel

ANT

MIC

Check ±1.2~1.9kHz

7. CTCSS fi ne deviation

• Wide [Low]

1) Adj item: [DVL.] (“CT” icon appear) Detector: P-P/2 LPF: 3kHz HPF: OFF De-emphasis: OFF2) Transmit


Rear panel

ANT Front panel

Tuning control

Write 0.75kHz±0.05kHz

[Center] 3) Adj item: [DVC.] (“CT” icon appear) Adjust: [✳✳]4) Transmit

[High] 5) Adj item: [DVH.] (“CT” icon appear) Adjust: [✳✳]6) Transmit

• Narrow [Center]

7) Adj item: [DVC.] (“CT” and “N” icon appear) Adjust: [✳✳]8) Transmit

0.37kHz±0.05kHz

8. DCS fi ne deviation

• Wide [Low]

1) Adj item: [DVL.] (“DCS” icon appear) Detector: P-P/2 LPF: 3kHz HPF: OFF De-emphasis: OFF2) Transmit

0.75kHz±0.05kHz

[Center] 3) Adj item: [DVC.] (“DCS” icon appear) Adjust: [✳✳]4) Transmit

[High] 5) Adj item: [DVH.] (“DCS” icon appear) Adjust: [✳✳]6) Transmit

• Narrow [Center]

7) Adj item: [DVC.] (“DCS” and “N” icon appear) Adjust: [✳✳]8) Transmit

0.35kHz±0.05kHz

9. DTMF fi ne deviation

• Wide

1) Adj item: [DT.] Detector: P-P/2 LPF: 15kHz HPF: OFF De-emphasis: OFF2) Transmit

3.0kHz±0.1kHz

• Narrow 3) Adj item: [DT.] (“N” icon appear) Adjust: [✳✳]4) Transmit

1.5kHz±0.1kHz

TM-281A

27

ADJUSTMENT

Receiver Section (Refer to the Table 1 on page 22 for the frequencies which will apply in the adjustment mode.)

Item Condition




1. Band Pass Tuning

[Low]

1) Adj item: [BPL.] Adjust: [✳✳]2) Spectrum analyzer setting Center-f: 136.050MHz Span: 200MHz RBW: 100kHz VBW: 100kHz ATT: 5dB3) Tracking generator output : –30dBm

Spectrum analyzer

Tracking generator

Rear panel

TX-RX(A/2)

ANT

BPF

Front panel

Tuning control

By turning the Tun-ing control, adjust the band-pass fi lter waveform as shown.

Refer to Fig. 1 (page 23).

[Center] 4) Adj item: [BPC.] Adjust: [✳✳]5) Spectrum analyzer setting Center-f: 155.050MHz Span: 200MHz RBW: 100kHz VBW: 100kHz ATT: 5dB6) Tracking generator output : –30dBm


[High] 7) Adj item: [BPH.] Adjust: [✳✳]8) Spectrum analyzer setting Center-f: 173.950MHz Span: 200MHz RBW: 100kHz VBW: 100kHz ATT: 5dB9) Tracking generator output : –30dBm


2. Squelch Tight

• Wide [Low]

1) Adj item: [SQTL.] Adjust: [✳✳]2) SSG output : –116dBm (0.35µV) SSG MOD: 1kHz SSG DEV: 3kHz

SSGOscilloscope

AF VMDistortion meter

Rear panel

ANT

EXT. SP

Write

[Center] 3) Adj item: [SQTC.] Adjust: [✳✳]4) SSG output : –116dBm (0.35µV)

[High] 5) Adj item: [SQTH.] Adjust: [✳✳]6) SSG output : –116dBm (0.35µV)

• Narrow [Center]

7) Adj item: [SQTC.] (“N” icon appear) Adjust: [✳✳]8) SSG output : –116dBm (0.35µV) SSG MOD: 1kHz SSG DEV: 1.5kHz

TM-281A

28

ADJUSTMENT

Item Condition




3. Squelch Open

• Wide [Low]

1) Adj item: [SQOL.]2) SSG output : –124dBm (0.14µV) SSG MOD: 1kHz SSG DEV: 3kHz

SSGOscilloscope

AF VMDistortion meter

Rear panel

ANT

EXT. SP

Front panel

Tuning control

Write

[Center] 3) Adj item: [SQOC.] Adjust: [✳✳]4) SSG output : –124dBm (0.14µV)

[High] 5) Adj item: [SQOH.] Adjust: [✳✳]6) SSG output : –124dBm (0.14µV)

• Narrow [Center]

7) Adj item: [SQOC.] (“N” icon apper) Adjust: [✳✳]8) SSG output : –124dBm (0.14µV) SSG MOD: 1kHz SSG DEV: 1.5kHz

4. RSSI writing 1) Frequency: 155.050MHz2) SSG output: –53dBm (501µV) SSG MOD: 1kHz SSG DEV: 3kHz

RSSI value writing is performed by the “Squelch open” item (center wide).SSG output level is changed and ad-justed after Squelch adjustment.This adjustment should not turn the Tuning control.

5. S-meter S1

1) Adj item: [S1.] Adjust: [✳✳]2) SSG output : –118dBm (0.28µV) SSG MOD: 1kHz SSG DEV: 3kHz

Write

6. S-meter Full scale

1) Adj item: [S7.] Adjust: [✳✳]2) SSG output : –96dBm (3.54µV) SSG MOD: 1kHz SSG DEV: 3kHz

TM-281A

29

TX-RX unit (X57-8130-XX A/2)

: TX-RX Section


CN702

1 SPGND - AF GND

2 SPGND - AF GND

3 SPOUT O AF out

4 SPOUT O AF out

5 8C O 8V DC supply

6 RXD I RXD/ PC serial data

7 PTT I PTT/ PC serial data

8 VOL I Volume

9 MICKEY I Microphone key

10 5C O 5V DC supply

11 CM I Microphone key check

12 ENCA I Encoder A

13 ENCB I Encoder B

14 DI I Data from LCD driver

15 DO O Data for LCD driver

16 CE O Chip enable for LCD driver

17 CL O Clock for LCD driver

18 BRI O LCD brightness control

19 POWER I Power key

20 MIC I Microphone

21 ME - GND

22 GND - GND

J701 (EXT. SP jack)

1 EXT SP O External speaker

2 GND - GND

TX-RX unit (X57-8130-XX B/2)

: Display Section


CN901

1 SPGND - AF GND

2 SPGND - AF GND

3 SPOUT I AF out

4 SPOUT I AF out

5 8C I 8V DC supply

6 RXD O RXD/ PC serial data

7 PTT O PTT/ PC serial data

8 VOL O Volume

9 MICKEY O Microphone key

10 5C I 5V DC supply

11 CM O Microphone key check

12 ENCA O Encoder A

13 ENCB O Encoder B

14 DI O Data from LCD driver

15 DO I Data for LCD driver

16 CE I Chip enable for LCD driver

17 CL I Clock for LCD driver

18 BRI I LCD brightness control

19 POWER O Power key

20 MIC O Microphone

21 ME - GND

22 GND - GND

J901 (MIC jack)

1 MBL O Key detection

2 8C O Switched 8V for MIC

3 GND - GND

4 PTT I PTT/ PC serial data

5 ME - MIC GND

6 MIC I MIC signal input

7 HOOK I HOOK/ PC serial data

8 CM I MIC data detection

TERMINAL FUNCTION

30

JIHGFEDCBA

1

2

3

4

5

6

7

8

9

10

11

12

13

14

GSD

GSD

R815

R820R821

R823IC715

R828

R829

C805

R842R844

C809

C815

F701

C824

10

C826

C828C833

FB+B

C848

Q703Q702

Q706

Q707

Q713

Q715

L702

R336

CN702

POWER

GND

5M

CNVSSRESET

UL 8C

8T

5C

TEMP1

TEMP2

ADJGND

RXD

TXD

CE

EPM

BUSYSCLK

TD1

BSB

4 5

1 8

RD1

R748

X701

R750R751

R754

R755

DTMFIN

R756

R759

C338

R2R3R4

R760

R762

C

R777

1

CC

R786R787

R791

R792

R793 SQIN

C

C764

C765

C766

C768C769

D710

C771

D712

GND

1 2

C772

C777C783

IC707

12526

5051 75

76

100

C789

IC712O

GI

R809

R822

R824

R825

R826

C801

C806

C810

C817

C822

C830

C832

C838

Q71

4

G S

D

R737

R739

R757

R758

R761

R765

R769

R770

R771

R772

R774

C749

C753

C763C7

67

C774

C775

C776

IC70

8

IC71

1

O

G

I

R817

R818

R819

R832

R833

R834

R841

R843

C816

C820

C827

C834

C850

Q70

4

Q70

5

Q71

2

R505

R507

R701

R702

R703

R704

R705

R706

R707

R708

R337

C508

C509

C702

C703

R749

C713

SPG

ND

SPG

ND

SPO

UT

SPO

UT 8C

RXD

PTT

VOL

MIC

KEY 5C CM

ENCA

ENCB D

ID

O CE CL BRI

POW

ER MIC ME

GN

D

1 22

R752

R753

C718

C719

C720

R763

R764

R766

R767

R768

R773

R775

R776

R778

R779

R780

R782

R783

R784

R785

R795

C761

C778

C779

C586

C587

C781

C782

TX-RX UNIT (X57-8130-XX) (A/2): TX-RX SECTION-10: K -21: M2 -22: M3 -23: M4Component side view (J79-0316-09 A/2)

TM-281A PC BOARD

J79-0316-09 A/2

31

J K L M N O P Q R S

1

2

3

4

5

6

7

8

9

10

11

12

13

14

GSD

R812

C401

C407

R835

R836

R837

R838

C70

C416

C417

C418

C807

C422

C835

Q502

C851

8R

L312

L313

L314

Q710

R503

R506

R519

R526R527

R334

R339

R535PC/TV

R341

R345

8T

R347

ANT

C515

RSSI

AFV

GND BPF

R557

R558

R559

4 5

1 8

C523

R378

C534

C345C348

C544

C350C354

C355C356

C552C559

D502

QIN

CV

D312

D313

C572

C577

3 4

IC302

C394C395

C814

R504

R505

R507

C508

C509

D50

1C5

84

C585

C586

C587

R813

C408

C409

C412

Q50

6

Q70

8

R508

R509

CN50

1

R520

R521

R529

R338

R340R3

42

R344

R348

TH50

1

R351

TH70

3

C514

C524

C525

C333

C334

R377

C530

C342 C3

47

D30

1

C556

D30

5

D50

3D

504

C565

D31

4

D31

6

C575

IC30

3

C579


Component side

Foil side

Layer 1Layer 2

PC BOARD TM-281A

Ref. No. Address

IC302 3K

IC303 8P

IC707 9F

IC708 7E

IC711 6G

IC712 7F

IC715 9B

Q502 11N

Q506 8R

Q702 7F

Q703 7F

Q704 10I

Q705 10I

Q706 10I

Q707 6F

Q708 10O

Q710 10O

Q712 10E

Q713 6D

Q714 5E

Q715 9D

D301 7O

D305 8P

D312 8Q

D313 5Q

D314 5R

D316 7Q

D501 12K

D502 12K

D503 11O

D504 10O

D710 6F

D712 6F

32

JIHGFEDCBA

1

2

3

4

5

6

7

8

9

10

11

12

13

14

GSD SD

G

SDG

CF501(WIDE)

C35

C42

C43

C48

C49

R811

R814R816

C50C54

C59

C400C402

C403

C404

C6745

18

C410C413

C415

C72

C421

C823

TC1

TC2

C6

D5D6

D8

+

Q501

Q503

L302 L305

L503

L310

L504

L506

L508

L315

L316

L319

L318

L510

L512

L514

L515

R304R307

R501

R314

L5

+ + +

R510

L8L9

R511

XF501

R515

R517

L12

R523

L13

R524

R331

L16L17

R528

L18

L19

L20

R531

R532

IC1

R536

C306

R537 R538

C308

R539

R346

R349

C502

C503 C504C505

C312

R543

GND BPFC507

R10

R350

R546

R13

C318

R549

R16

R17R18

C510

89

116

R19

C511

TH702

C513

R550R551

C516

R552R553

R747

R20

R554

C518

R555

R21

CV

R22

C329

Q2

R27

Q3

Q73

1

4

5

Q8

R560

C331

C332

C528

R33

R35

R37

R7

R8

C340

C535

R380

C538

R40

R41

R44

R46

C541C545

C546

C547C548

C549

C550C551

C553C554

C555

C365

R789

D309

C560

R790C562

R794

D505

D311

R7967

1

C566

C567

D508

D509

C569

C570

C571

C574

C576

C578

C581

C582

C397C399

X1

C784

C787

C788

IC710

3

1

4

5

C11

C14

C15

C16

C405

C406

D30

6

D30

7

L317

C34

C38

C41

C46

C52

C53

C55

C56

C58

Q10

C65

C68

C69

C71

C420

L320

D4

D7

D9

Q50

4

Q50

5

G1

S

SD

DG

2

G1

G2

L507

L511

D10

L7

L10

L11

L14

L21

R534

R540

R541R5

42

R544

R545

R547

R556

R24

R25

R26

R29

Q5

R31

R34

C537

C539

R42

R43R4

5

C557

C558

C561

D50

6

C568

C573 C6

0C6

2C6

3

C64

C66

R512

R514

R525

IC2

C517

C519

C520

C521

C522

Q6

Q9

C527C5

33

IC50

1

C583

R522

C36

C39

C45

C51

C57

D3

L502

R502

L6

L15

C506

CD50

1R2

8

Q4

R30

R32

R38

C20

C21

C23C2

5

C27

C28

C29

C61

C804

C811

C1

C3 C4

C5

C7

C91011

120

D1

D2

Q30

3

G S D

C849

L308

L309

Q70

9

Q71

1

R312

L1

L2

L3

R326

R332

R333

C309

C310

R11

R12

R15

R23

C328

Q1

C330

R1R5

R6

R9

C343

C344

C10

C12C1

7C1

8

CF50

2(N

ARR

OW

)

R741

R742

R746

C790

L505

TX-RX UNIT (X57-8130-XX) (A/2): TX-RX SECTION-10: K -21: M2 -22: M3 -23: M4Foil side view (J79-0316-09 A/2)

TM-281A PC BOARD

33

J K L M N O P Q R S

1

2

3

4

5

6

7

8

9

10

11

12

13

14

R801

R803R804

R808R810

R827

R831

C800

C802

C808

C829

C6

C837

C847

C853

C854

+

Q701

R710

R713

R714

R716

R717

R718

R719

R725

GND

ADJ

R726R727

R730

R736

R745

R747

C722C725

C726

C727

C728

C729

C731

C733

C735

C736C737

C738

C739

C742

C743

C744

R781

C747

R789

C751

C752

R790 C757

C758

R794R796

7

78

114

8

1 14

R797

D708

D714

+

X1

IC703IC704

C784

IC705

C785C786

C787

C788

0

3

1

IC713 G

O

I

+

C793

IC714

O

GI

C795

C796

C1

C5

L1

R332

R1R5

R6

R800

R802

R805

R806

R807

C821

L701

R711

R715

R721

R722

R723

R724

R728

R729

R733

R734

R735

R738

R740

R741

R742

R743

1213

124

R744

R746

C724

C732

C734

C740

C745

C746

C748

C750

C754

R799

D70

2

D70

4

D70

5

D70

6

D70

9

D71

1

IC70

9

C790

C794

C797 C7

98

4

45

18

5

18

C799

C818

C825

C831

C840

C844

IC70

6

J701EXT. SP

C836

C839

R830


Component side

Foil side

Layer 1Layer 2

PC BOARD TM-281A

J79-0316-09 A/2

Ref. No. Address IC1 9I IC2 8F IC501 11F IC703 11M IC704 11L IC705 9K IC706 12K IC709 10K IC710 8J IC713 6O IC714 8M Q1 10I Q2 10I Q3 8G Q4 10H Q5 9F Q6 9F Q7 9F Q8 10F Q9 9G Q10 8F Q303 7H Q501 11H Q503 11E Q504 10C Q505 10A Q701 12M Q709 7I Q711 7I D1 10I D2 8I D3 10G D4 10F D5 10G D6 10F D7 9F D8 10F D9 8E D10 8E D306 6B D307 6C D309 6A D311 6A D505 11B D506 11B D508 9A D509 8A D702 12N D704 12N D705 12O D706 12O D708 12M D709 12M D711 11L D714 4M

34

JIHGFEDCBA

1

2

3

4

5

6

7

8

9

10

11

12

13

14

Q903

B

C

E

Q904B

BE

C

C

R901R909

R916

R917

R919

CN901

C903

C910

VR901

CALL VFO MR

1

2

8

CM

HOOK

ME

GND

MBL

MIC

PTT

8C

CM

HOOK

ME

GND

MBL

MIC

PTT

8C

7

J901

D904

D906

D907

D908

D909

D911

Q901

Q902

R914

R915

R918

R920

R921 R

922 R923

R924

C901

C902

C912

C915

C916

C917

C918

C929

D901

D902

SPG

ND

1 22

SPG

ND

SPO

UT

SPO

UT 8C

RX

D

PTT

VO

L

MIC

KEY 5C

CM

ENC

A

ENC

B DI

DO CE CL

BR

I

POW

ER

MIC

ME

GN

D

TX-RX UNIT (X57-8130-XX) (B/2): DISPLAY SECTION-10: K -21: M2 -22: M3 -23: M4Component side view (J79-0316-09 B/2)

TX-RX UNIT (X57-8130-XX) (B/2): DISPLAY SECTION-10: K -21: M2 -22: M3 -23: M4Foil side view (J79-0316-09 B/2)

TM-281A PC BOARD

35

J K L M N O P Q R S

1

2

3

4

5

6

7

8

9

10

11

12

13

14

L901

R911

R913

C924

C927

C928

SP+

SP–

IC901

116

17

32

33 48

49

64

S901ENCODER

MR REV FUNC

D903

D905

D910

D911

CP901

R902

R903

R904

R905

R906

R908

R910

C920

C921

C922

C926

R912



Component side

Foil side

Layer 1Layer 2

Component side

Foil side

Layer 1Layer 2

PC BOARD TM-281A

J79-0316-09 B/2

J79-0316-09 B/2

Ref. No. Address

D903 6K

D904 6G

D905 6O

D906 4F

D907 4G

D908 4H

D909 4I

D910 4L

D911 4J

Ref. No. Address

IC901 12K

Q901 11F

Q902 11F

Q903 11G

Q904 11F

D901 9D

D902 10D

36

TM-281A SCHEMATIC DIAGRAM

X57-813 (A/2) 1/3

-t-t

C23

470p

C10

68p

R24

100k

C75

7

10u

C34

1000

p

R23

10k

C46

0.5p

C43

470p

C74

8

1000

p

R71

9

1.2k

C59

470p

C74

7

10u

C76

6

5p

C73

9

1000

p

R71

5

680

R739

22k

C72

4

10u

C72

7

1000

p

C55

0.5p

TC

2

6p

R17

470

R73

3

680k

C74

6

0.1u

C54

0.3p

R745

8C

C752

3900p

5C

C73

7

1000

p

C73

6

10u

L3

R71

8

1.5k

R19

2.7k

R74

6

82k

C767

3p

R722

1.5k

C56

22u1

6

R728

82k

R26

47k

R72

4

6.8k

C74

9

0.01

u

R21

1.5k

5C

R721

D5

HVC359

D3

HV

C35

9

C42

470p

5M

C28

470p

C12

10u

C48

1000

p

R71

4

100k

R11

10k

D4

HV

C35

9

2SC4919-SQ701

C733

0.1u

2SC4738(GR)FQ2

2SA1832(GR)FQ1

D6HVC359

R730

82k

L10

C3

100p

L701

R8

100kD

2

DA

2S10

1

C11

0.1u

C41

0.5p

R744

R25

47k

R38 10

0

R16

0

C74

3

1000

p

L5

C18

0.1u

D70

8

DA

2S10

1

5C

C57

470p

R758

0

C74

0

0.1u

R35

120k

R743

C4

100p

C73

1

0.01

u

C73

4

IC703NJM2100V-ZB

1 2 3 45678

V+

R28

220

TC

1

10p

C61 3p

R75

9

1k

R37 0

R10

8.2k

C16

1000

p

R734

220k

C17

0.01

u

D7091SS372F

C74

4

10u

R13

10k

C14

0.1u

C72

8

2.2u

R71

0

15k

C726

C20

470p

C29

0.1u

35

R71

1

15k

5C

R6

1.5k

C76

4

5p

R72

3

9.1k

C25

0.04

7u35

C75

4

10u

C49 4.5p

R22

22k

L17

R2 1k

C5

1000

p

R72

9

120k

R31

4.7k

8C

C75

0

150p

R12

5.6k

R3 1k

R72

7

330k

R740

68k

R9

470

R4 1k

C58

1000

p

C27

1.5u

16

IC1MB15A02PFV2E1

11121314151617181920

R74

2

120k

C738

0.1u

C60

6p

R737

10k

L2

10u

R74

7

100k

D8

DA

2S10

1

D1

HZU5ALL

C7

100p

C732

R738

68k

C72

5

0.1u

C763

3p

C75

3

4700

p

C51

5p

C72

2

1000

p

C74

2

820p

C72

9

10u

R73

5

270k

R34

1k

R7

10

R71

7

C53

1000

p

R15

1k

8C

R30

100k

R716

100

R725

240k

R20 1k

R74

1

150k

C15

10u

R726

18k

C75

8

10u

R27

47k

R749

5.6k

TH

702

100k

C83

5

1000

p

TH

703

100k

C82

3

1000

pC745

39p

IC705M62363FP-F

1 2 3 4 5 6 7 8 9

10 11 12131415161718192021222324

R73

6

10k

IC706BA10324AFV

VCC VEE

C735

C75

1

1u

X1

C6

1000

p

C9

0.1u

L6

270n

L8

270n

C36

30p

L13

27u

L12

33n

C39 8p L1

5

27u

R32

220C

45 1p

R29

470

L7

270n

C3582p

L1147n

C38 10

p

L9 270n L1

4

27u

C5010p

R33

100

L16

27u

C52

11p

L1

L18

33n

D7

1SV

278F

IC704NJM12904RB1

12345 6 7 8

VC

C

SPLATTER FILTER

W/N

I(E

VO

L1)

5C

VCOCV

VOLTAGEDROPPED

SWITCHING

OP AMP

TCXO

IDC

DETECTION

BUFFER AMP

CK(CPU54)

DT(CPU53)

DT

(CP

U53

)

HPF

TX-RX UNIT (X57-8130-XX)(A/2) : TX-RX SECTION

W/N

O(E

VO

L2)

PLLE(CPU3)

FR

QO

UL(CPU21)

CK

(CP

U54

)

PLL

E(C

PU

3)

8CL

8CL

RIPPLEFILTER

DIGITALPOTENTIOMETER

OSCILLATOR

MO

DI(

EV

OL9

)

Q1,2

D4,6

8C

D3,5

MOD

MODULATION

8C

1/2Vcc

AGC/MIC MUTE

T/R SWITCH

PLL IC

D7

T/R SWITCH

16.8MHz

BEATSHIFT

TC

XO

MO

D

RIPPLEFILTER

RF AMP

RIPPLEFILTER

1 2 3 4 5 6 7 8 9 10C

LOC

K

NC

3

DAT

ALEFC

NC

4

FO

UTP

NC

5RO

SC

IN

NC

1

OS

CO

UT

VP

VC

C

DO

GN

D

LD NC

2

FIN

2SC4649(N,P)Q3

MCH3914(7)-HQ6

2SJ347FQ5

MCH3914(7)-HQ4

2SC5108(Y)FQ9

Q7UMC4N

KTC4075E(Y,GR)Q8

2SC4919-SQ702

X701

2SC4919-SQ703

8

9

10

11

12

13

141

2

3

4

5

6

7

2VO

LI

2VO

LO

BLO BLI

1VO

LI

1VO

LODO

VD

Fref

RE

SE

T

GN

D

FR

QI

FR

QO

PC

/TV

O

PC

/TV

I

VD

D

LD CLK

DAT

MO

DI

MO

DO

W/N

O

W/N

I

BR

II

BR

IO

QT/DQT(CPU1)

1/2Vcc

EVLLD(CPU8)

UL(CPU21)

PLLE(CPU3)

XOUT(CPU11)

XIN(CPU13)

TX DTMF

BSHIFT

MICMT(CPU77)

TX/RX (CPU20)

W/NO(EVOL2)

W/NI(EVOL1)

MIC

VOLO(EVOL15)

VOLI(EVOL13)

DT(CPU53)

CK(CPU54)

BRI

PLL

E(C

PU

3)

MO

DO

(EV

OL1

0)

PC

/TV

UL(

CP

U21

)

PC

/TV

O(E

VO

L3)

EV

LLD

(CP

U8)

MIC

MT

(CP

U77

)

MO

D

TX

/RX

(C

PU

20)

R756

10k

R762

10k

R829

0

R828

0

R74

8

22k

VC +DC

GNDOUTPUT

C21

470p

R18 0

R1

100k

C1

22u

R5

10k

FRQO

1k

1k1k

68p

R71

3

820

R835

R836

R837

R838

K

M3

M2

M4

X57-8130-XX

-23

-10

-21

-22

C726

0.039u

0.039u

0.039u

0.068u

1000p

1000p

680p

C732

1000p 0.022u

0.022u

0.039u

0.022u

C734

0

R717

0

NO

0

R721

NO

NO

0

R835

NO

NO

NO18k

R837

10k

18k

18k

750k

750k

1M

750k

R838R836

NO

NO

NO

NO

NO

NO

MIC MUTE

OP AMP

OP AMP

OSCILLATOR

SWITCH BEATSHIFTSWITCH

CONTROLFREQENCY

VCO

CONTROLFREQENCY

VCO

RX VCO

TX VCO

L77-1944-05

L78-1427-05

PC/TV

T:0.77V

BEAT SHIFT ON:4.87V

R:4.84VT:0V

R:2.29VR:4.93V

R:0.73VT:0.72V

R:3.35V

R:5.85V

R:6.03V

R:0.71V

R:2.50V

R:7.59V

5.00V

R:5.00V

R:6.85V

T:6.77V

R:1.07V

R:4.94V

R:0.76V

R:1.47V

R:7.82V

R:6.91V

R:2.21V

R:0.76V

R:7.81V

T:3.68V

BEAT SHIFT OFF:0V

7

6

5

4

3

2

1

A B C D E

37

SCHEMATIC DIAGRAM TM-281A

X57-813 (A/2) 2/3

PTT

C68

1000

p

C56

6

1000

p

R773

0

R502

100

R514

4.7k

R550

10k

L305

10n

R76

5

1k

C519

10u

C56

5

1000

p

R524

390k

R50

9

0

C64

220p

C778

1u

C55

0

1000

p

R75

7

47k

R55

5

100k

R55

5

100k

C507

0.01u

L502

330n

C53

5

1000

p

D9

C71 39p

C55

7

5pC54

8

0.01

u

R782

1k

R35

8

220k

R50

7

10k

C62

2p

C65

1000p

C50

2

0.01

u

C54

4

0.1u

C57

9

1000

p

R53

7

470k

8R

CE

R77710k

C51

0

0.01

u

RXD

L504

330n

CNVSS

D501MC2858-T111

R41

10k

C55

2

1000

p

R54

9

150

C573

4p

5M

C70

1000

p

C77

4

1800

p

5M

C31

0

C57

2

1000

p

R547

0

R528

1k

C769

1000p

R7761.5k

IC708EX24064ASAS0A

1A0

2A1

3A2

4VSS

5

6

7

8

R44

100

IC2UPB1509GV

1

2

3

4 5

6

7

8 R307

0

C76

1

0.1u

5M

R50

6

10k

5M

R778

10k

L503

330n

8R

C555

1p

R775

1k

R76

1

47k

R40 1k

C54

1

1000

p

L702

C50

4

56p

C67

18p

5C

5C

8C

R77

1

47k

5C

R763

0

C56

7

1000

p

C52

0

1000

p

R78

1

47k

DI

R76

9

1k

L21

39n

R50

3

6.8k

C527

5p

R77

0

0

C308

1200p

L507

390n

C56

9

1000

p

R772

10k

C72

18p

C51

1

10u

C776 1000p

L302

22n

DO

C50

3

270p

8R

R542

0

R78

5

12k

8RC

777

0.47

u

C69

1000

p

5M

5M

C54

9

1000

p

C53

8

0.01

u

R774

4.7k

D502MC2858-T111

R55

2

47k

L508

47n

C50

8

1u

C77

9

0.1u

C56

2

1000

p

C77

2

0.1u

C514 0.1u

C568

100p

L20

100n

R78047k

R46

2.2k

R45 10

0

8R

C63

1000

p

R52

2

100

R54

0

47k

R50

8

6.8k

C77

1

1000

p

C54

7

1000

p

R525

270

R78

4

15k

C30

9

C55

6

1000

p

R50

4

10k

C545

13p

R42

8.2k

R54

3

100k

C77

5

3900

p

L506

390n

R501

120k

2SC5108(Y)FQ10

C768

0.1u

R51

5

4.7k

R50

5

10k

R783

39k

C50

9

1u

R55

4

100k

C52

8

0.01

u

R43

100

5M

TON

E

DT

MF

PLL

E

NC

NC

GN

D

CN

VS

S

EV

LLD

BS

HIF

T

RE

SE

T

XO

UT

VS

S

XIN

VC

C

GN

D

NC

PO

WE

R

INT

NC

TX

/RX

UL

NC

NC

EE

PS

DT

EE

PC

K

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51525354555657585960616263646566676869707172737475

76

77MICMT

78NC

798RC

808TC

81NC

82SBC

83NC

84NC

85NC

86CM

87MICKEY2

88MICKEY

89VOL

90TEMP2

91TEMP1

92RSSI

93SQIN

94AVSS

95DTMF IN

96VREF

97AVCC

98NC

NC

NC

EN

CA

EN

CB

R753

47k

R751 1k

R750 1k

R75

2

47k

KTC4080E-PQ501

C505

68p

C66

1000

p

5M

CL

R75

5

47k

R76

8

R76

7

R76

40

R76

6

R78

6

150k

R78

7

120k

KTC4080E-PQ503

R531

100

C53

7

20p

C53

3

6p

C53

9

20p

R53

4

220 R

539

180

C551

100p

R54

1

33k

C55

3

3p

C55

8

33p

D50

6

3SK318Q504

3SK294-FPQ505

R55

1

100k

R55

3

27k

L514

68n

L515

68n

C546

27p

C765

1000p

R76

0

47k

L19

R77

9

47k

5M

C57

4

1.5p

C57

0

1p

2SK3019Q705

2SK3019Q704

8TC(CPU80)

FM IC

BPF

5M

WIDE(CPU65)

TXDRXD

RF SWITCH

NARROW

NARROW(CPU64)

D505,506

IF SWITCH

RF BPF TUNING

D508,509

IF AMP

50.4

MH

z

8R 8R

IF SWITCH

W/NI(EVOL1)

EEPROM

RF AMP

MCU

AFV

AF MUTE

AF MUTE

VOLI(EVOL13)

DIVIDER

AFM(CPU50)

WIDE

TRIPLER

RF BPF TUNING

MIXER RF AMP

8RC(CPU76)

8TC(CPU80)

AMPSW(CPU52)

SPM(CPU51)

BRI

8RC(CPU76)

VOLO(EVOL15)

W/NO(EVOL2)

MIC

PC/TV

CM

MICKEY

VOL

TV

TX/RX (CPU20)

QT/DQT(CPU1)

EVLLD(CPU8)

TX DTMF

UL(CPU21)

PLLE(CPU3)

XOUT(CPU11)

XIN(CPU13)

POWER

MICMT(CPU77)

CK(CPU54)

DT(CPU53)

W/NO(EVOL2)

PC/TV

W/NI(EVOL1)

MIC

VOLI(EVOL13)

VOLO(EVOL15)

BRI

SQIN(CPU93)

RSSI(CPU92)

SBC(CPU82)

1/2Vcc

DTMF IN(CPU95)

BSHIFT

IC70730622MEP540GU

NC

TXD1

RXD1

CLKFLS

BSYFLS

TXD

RXD

PTT

NC

NC

NC

EMPFLS

NC

NC

NC

NC

CEFLS

NC

NC

NC

NC

NC

AFM

EEPWP

NC

SP

M

AM

PS

WDT

CK

NC

DS

T1

DS

T2

DS

T3

DS

T4

VC

C

NC

VS

S

AD

J

NA

RR

OW

WID

E

NC

NCCL

CE

DO

(to

LCD

)

DI(

from

LC

D)

NC

EN

CB

EN

CA

99

100

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

SPM(CPU51)

AMPSW(CPU52)

W/NI(EVOL1)

VOLI(EVOL13)

SW1

SW2

OUT

VCC2VCC1

IN

IN

GND

SDA

SCL

WP

VCC

SQIN(CPU93)

SBC(CPU82)

RESET(CPU10)

INT(CPU18)

1/2Vcc

DTMF IN(CPU95)

RSSI(CPU92)

IC501UA31136L

MIXIN

GND

N-REC

AFOUT

IFIN

DEC

FILOUT

FILIN

OSCIN

OSCOUT

MIXOUT

VCC

1

2

3

4

5

6

7

8

11

12

13

14

15

16

XF501

CF501

CF502

TV

R55

6

0

D50

9C

576

18p

D50

8

1SV

325F

C57

1

18p

1SV

325F

C57

5

1000

p

R557

100k

R559

27k

C57

7

1000

pR

558

47k

2SK1830FQ506

8T

D50

5C

554

24p

L510

68n

1SV

325F

C560

1000p

R54

5R

546

100

L511

68n

1SV

325F

R54

4

100k

L512

330n

C56

1

1000

p

1k

C58

2

1p

R536

560

R52

3

0

L505

3.3u

N-DET

RSSI

IFOUT

QUAD

C50

6

47p

0.1u

C515 0.1u

C517

R51

2

560k

C51

3

330p

C516

R511

22k

10

9

330pR

510

1k

100p

C518

C58

3

4p

C522

27p

CD

501 R

517

1.8k

C52

1

0.01

u

FILOUT

C584

0.1u

C585

0.1u

C586

0.1u

C587

0.1u

R75

4

47k

R844

10k

NC

NC

5M

5M

R843

47k

CE

R841

47k

EPM

BUSY

R842

10k

SCLK

TD1RD1

RESET

C31

2

12p

8p6p

HSC277

R532

0

C30

6

1000

p

R30

4

1k

K

M3

M2

M4

X57-8130-XX

-23

-10

-21

-22

0

R766

0

NO

0 0

0

R767

NO

NO

0

R768

NO

NO

NO

R82

6

47k

PC/TV SWITCH

D10 HSC277

D9,10

L71-0655-05

R:1.23V

R:7.52V

R:6.78V

R:0.71V

R:2.48V

R:4.94V

R:5.00V

R:4.82VT:4.76V

4.94V

R:0.71V

R:1.81V

SQ ON:0V

R:2.85V

N:0VW:4.90V

R:2.51V

R:5.00V

R:2.19V

R:5.59V

T:5.55V

R:3.20V

R:7.04V

W:0VN:4.90V

R:4.94V

R:5.96V

SQ OFF:4.94V

T:4.87V

R:7.07V

JIHGF

TX-RX UNIT (X57-8130-XX)(A/2): TX-RX SECTION

38

TM-281A SCHEMATIC DIAGRAM

X57-813 (A/2) 3/3

-t

C83

3

1000

p

C34

7

0.1u

L319

5T

C80

2

L318 5T

B

5M

R790

12k

C41

2

1000

p

IC713TA7805F-NQ

2

GND

3

IN1

OUT

R79

9

470k

2SJ645Q714

R79

4

120k

C79

0

0.03

3u

C83

2

0.1u

R814

1.5k

5C

R797

2.7k

R33

8

150k

BS

B

C406

1000p

C78

6

0.03

9u

R82

2

330k

C80

6

10u

R35

1

47k

R35

1

47k

C52

5

0.22

u

C84

9

10u

C83

4

1000

p

R34

6

220

R811

0

TH

501

470k

8R

5C

C53

4

0.03

9u R819

12k

C82

1

1000

p

8T

L320

5T

R812

2.2k

R334

100

C80

7

10u

8T

L315

9.5T

R82

4

470k

Q712DTC363EU

R80

7

1M

R80

5

5.6k

C82

40.

1u

2SB1694Q711

C84

0

0.1u

L317

1.5T

D307

C40

8

0.5p

R795

5.6k

R52

0

470k

C79

8

0.22

u

R810

15k

R813

47k

R81

7

47k

C82

6

1000

p

C523

5600p

R80

4

12k

C785

0.01u

C816

0.22u

C35

0

1000

p

C81

5

0.1u

D712

UDZW18(B)

C80

0

1000

p

R802

47k

Q709RT1N141U-T111

C84

7

B

C80

5

1000

p

C83

7

0.01

u

R79

2

5.6k

C78

3

1u

C82

0

1000

p

2SB1694Q710

C39

9

0.01

u

R809

470

8C

C79

9

4.7u

D503HSB88AS-E

Q713RT1N141U-T111

C81

7

1000

p

D7111SS372F

C34

4

100p

L316

9.5T

C41

5

22p

C41

0

18p

R818

68k

C79

6

1200

p

C42

2

1000

p

C80

4

0.01

u

C80

9

1u

C80

1

1000

p

R80

6

2.7k

C35

5

47p

C84

4

1000

p

C41

7

0.5p

C35

6

22p

C78

2

0.1u

R800

5.6k

C82

5

22u

D30

1

UD

Z5.

1(B

)

C83

147

u16

R37

7

10k

R535

0

5C

C82

74.

7u

R37

8

10k

R815

4.7k

R52

1

1k

R79

3

91k

BS

B

C795

0.22u

C78

1

1000

p

D314HSB88AS-E

R816

47k

Q708RT1N141U-T111

C81

0

0.1u

R80

8

15k

C808

1u

C83

0

1000

p

R801

0

C40

2

0.01

u

R82

1

47k

R82

5

390k

Q715RT1N141U-T111

C82

8

1000

p

C34

2

100p

D71

4

Z5W

27V

R80

3

3.9k

Q707RT1N141U-T111

R791120k

R82

7

330k

2

GND

1IN

3

OUT

C39

7

1000

p

C79

7

39p

8R

C82

9

0.01

u

C79

4

8200

p

8C

C530

0.022u

C83

8

1000

p

C822 1000p

IC303NJM12904RB1

1

2

3

4VEE

5

6

7

8VCC

D31

1

C78

8

0.01

uR

519

10k

R79

6

18k

C793

0.018u

R52

9

390k

C40

9

4p

R78

9

220k

R82

0

220

C789

0.033u

R82

3

390

CN702

R834

R701

C71

8

C71

9

C71

310

00p

C72

0

D70

5

D70

4

D70

6M

C28

50

D70

2

5M

C42

1

C413

2p

C40

4

18p

JDP

2S12

CR

R348

15k

1

2

3

4VCC

5

6

7

VEE

2SC2412KQ706

FB

D710

DA2S101

IC714XC61CN3202MR

J701

F701

FB

C83

6

330u

25

C578

39p

C581

33p

Q303

BUFFERAMP

MIC

SQ

IN(C

PU

93)

B

OVER VOLTAGE

DETECTION

E8V AVR

REVERSECONNECTIONPROTECTION

APC CONTROLLER

D309,311

TEMPERATURECOMPENSATION

1/2Vcc

5M

LIMITER

8TQ709,711

APC VOLTAGEDETECT

VOLTAGEDETECTION(RESET)

D313,314

ANT SWITCH

D702,704-706

8TC(CPU80)

8RC(CPU79)RX

5C

DETECTION

VOLTAGEDETECTION(INT)

DC SWITCH (SB)

8C

W/N

O(E

VO

L2)

SQL AMP

Q708,710

8C

SB

OVER VOLTAGEDETECTION

SURGE ABSORPTION

AF MUTE

AF MUTE

8R

POWER

IC715LA4600

12345678910

PTT

BRI

RXD

POWER

VOL

8C

5C

DO

CL

CE

DI

MICKEY

ENCB

CM

ENCA

DC SWITCH (8R)

DC SWITCH (8T)

PROTECTION

BRI

AUDIO AMP

RD00HVS1-T113

AMPSW(CPU52)

MIC

8TC(CPU80)

SPM(CPU51)

8RC(CPU76)

BRI

PC/TV

VOLO(EVOL15)

W/NO(EVOL2)

2SC4617(S)Q502

8

9

10

11

12

13

14

IC709BA10324AFV

DTMF IN(CPU95)

INT(CPU18)

RESET(CPU10)

SBC(CPU82)

1/2Vcc

SQIN(CPU93)

INT(CPU18)

RESET(CPU10)

SBC(CPU82)

IC712

IC711TA7808F-NQ

IC710XC6209B502P-G

AMPSW(CPU52)

VOLO(EVOL15)

SPM(CPU51)

C78

4

0.01

u

C78

7

0.01

u

C405

1000p

R380

0

ANT

C420

4p

18p

C41

8

4p

D313HSB88AS-E

C41

6

1000

p

C40

7

1000

p

D312

RB521S-30

R34

7

1.5k

C40

1

1000

p

D306L407CDB

L407CDB

D30

9

JDP

2S12

CR

C40

3

27p

C36

5

6p

C34

8

C34

5

100p

C35

4

22p

L314

L313

L312

C34

3

1000

p

C34

0

220p

1000

p

R33

2

10

R33

3

100

R331

R33

6

47

10

C33

1

C32

9

1000

p

0.02

2u

L309

120n

C332

150p

L310

47n

L308

8.2n

C32

8

13p

C33

0

2.5p

8T

R350

10

C31

8

1000

p

R31

4

22k

R31

2

4.7k

R32

6

12k

R34

9

220

C40

0

1000

p

D31

6

RB

521S

-30

C39

50.

1u

C39

4

1000

p

R34

5

100k

R34

4

100k

R34

1

150k

C33

8

1000

p

R33

7

100

C33

4

1000

p

C33

3

4.7u

R34

0

22k

R34

2

1.5k

R33

9

10k

DA2S101

D305

R557

100k

C57

9

1000

p

TV

MC

2850

MC

2850

MC

2850

C70

20.

047u

C70

3

0

1k

R706

0

R708

0

R707

1k

R705 1k

R704 1k

R702

100

R703

100

R83

1

0

0.04

7u

1000

p10

00p

1000

p

R83

0

0

R83

2

0

R83

3

0

1000

p

C83

9

330u

25

C81

8

22u

2

VSS

3VIN VOUT 1

XC61CN4002MR

2

VSS

3 VIN VOUT 1

C85

0

10u

C85

1

10u

C81

4

10u

1N

C2

CE

3V

SS

45

VIN

VO

UT

C84

8

10u

10u

C81

1

0.1u

R560

0

FILOUT

C52

4

0.1u

C55

9

1000

p

R526

0

R52

7

470k

D504DA2S101

C85

3

22u

C85

4

22u

ANT SWITCH

D316

PROTECTION

PROTECTION

DC SWITCH (SB)

DRIVE AMP

VOLTAGEPROTECTION

D306,307

POWER MODULE

PROTECTION

OP AMP

5V AVR

5V AVR

EXT SP

RA60H1317M231IC302

1 2 3 4

RF

_IN

VG

G

VD

D

RF

_OU

T

4A

ANT

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

SPGND

GND

ME

19

20

21

22

1

PTT

BRI

RXD

POWER

VOL

8C

5C

DO

CL

CE

DI

MICKEY

ENCB

CM

ENCA

MIC

SPGND

SPOUT

SPOUT

CN501

STRIP LINE

R:3.20V

R:4.93V

R:2.62V

R:7.79V

R:13.8V

T:2.71V

R:4.94V

T:1.58V

R:13.8V

R:4.56V

R:0.45V

R:3.34V

R:0V

T:7.67V

R:1.02V

R:3.22V

T:7.73V

R:7.82V

65W:4.29V

25W:0.77V

T:7.72V

25W:3.43V

65W:1.25V

T:13.8V

R:5.98V

R:7.82VR:5.00V

K L M N O

TX-RX UNIT (X57-8130-XX)(A/2): TX-RX SECTION

39

SCHEMATIC DIAGRAM TM-281A

X57-813 (B/2) 1/1

Note: The components marked with a dot (•) are parts of layer 1.

C91

2

1000

p

C92

6

100p

R91

8

820

C91

8

1000

p

C92

8

680p

C91

5

100p

Q904UMG3N

J901

R923

CP901

C901

0.1u

D903 C92

9

1000

p

Q902

RT1N141U-T111

C90

3

0.1u

L901

R92

0

CN901

R910

10k

R908

100

D901

1SS355

C92

2

1000

p

R90

6

0

D904

B30-2337-05

R912

10k

R91

3

56k

C92

0

470p

C92

1

1u

R914

1k

R903

4.7k

R91

7

3.9k

D906

B30-2337-05

R922

330

C91

7

1000

p

C90

2

0.1u

C91

6

1000

p

R91

9

2.7k

Q901RT1P141U-T111

R902

4.7k

R92

1

C92

7

100p

BL

NC

NC

NC

SE

G0

SE

G1

SE

G2

SE

G3

SE

G4

SE

G5

SE

G6

SE

G7

SE

G8

SE

G9

SE

G10

SE

G11

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33343536373839404142434445464748

49NC

50KI1

51KI2

52KI3

53NC

54NC

55NC

56VDD

57VDD1

58VDD2

59VSS

60OSC

61DO (to cpu)

62CE

63CL

64DI (from cpu)

R90

4

0

R911

10k

VR901R31-0662-05

R924

C92

4

0.1u

R90

5

0

R909

1k

S901W02-3704-05

SE

G9

SE

G15

SE

G7

SE

G10

SE

G23

SE

G3

SE

G21

SE

G11

CO

M2

SE

G13

CO

M1

RESISTOR

CO

M3

SE

G24

SE

G1

LCD

SE

G17

SE

G27

SE

G29

SE

G4

SE

G26

SE

G31

SE

G5

SE

G14

SE

G18

SE

G19

VARIABLE

SE

G8

SE

G12

SE

G2

SE

G20

LED

TX-RX UNIT (X57-8130-XX)(B/2) : DISPLAY SECTION

SE

G22

MR

SE

G0

SE

G16

CO

M0

SE

G6

SE

G28

SE

G25

SE

G30ENCODER

LCD DRIVER

KEY BACKLIGHT SWITCH

BRIGHTNESSFUNCTIONSWITCH

D903-905

LCD BACKLIGHT SWITCH

DC SWITCH

LED

2

3

4

5

6

7

8

8

9

10

11

12

13

14

15

16

17

18

Func

CALLVFO

REV

CMHOOKMIC

MEPTTGND8CMBL(Key A)

SPGND

GND

ME

2SB1132(Q,R)Q903

IC901PT6554LQ

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16S

EG

28

SE

G29

SE

G30

SE

G31NC

NC

NC

CO

M0

CO

M1

CO

M2

CO

M3

KS

1

KS

2

NC

NC

NC

SEG12

SEG13

SEG14

SEG15

SEG16

SEG17

SEG18

SEG19

SEG20

SEG20

SEG22

SEG23

SEG24

SEG25

SEG26

SEG27

R901

0

19

20

21

22

1

1

PTT

BRI

RXD

POWER

VOL

8C

5C

DO

CL

CE

DI

MICKEY

ENCB

CM

ENCA

MIC

SPGND

SPOUT

SPOUT

SPGND

SPOUT

C91

0

1000

p

1k x4

R91

6

18k

18k

100k

D905R915

1.5k 330

330D908

D910

D907

D909

D911B30-2337-05

B30-2337-05

B30-2337-05

B30-2337-05

B30-2337-05

D90

2

UD

ZW

6.2(

B)

REVERSECONNECTIONPROTECTIOM

D901

SURGEABSORPTION

D906-911

LCD ILLUMINATION

KEY ILLUMINATION

INT SP

+

-

7.81V

5.00V

7.56V

5.00V

4.96V

7

6

5

4

3

2

1

TSRQP

TM-281A

40

KTC4075E(Y,GR)

RX

8C

PTT/TXD

Q701

AGC

TX

CK

FILTER

KS1

8C

RXD

8CL

NJM2100V-ZB

PLL ICFin

SW

CM

KEY BACKLIGHT

SPOUT

VCO

MIC

FILTER

B30-2337-05

SPGND

SW

Q8

SW

DI

RXD

2SC4919-SIC703

VCOMO

Q901

MIC

16.8MHz

MICKEY

SQIN

8C

Q45C

MICKEY

2SC4649(N,P)

PTT/TXD

CE

IC1

SPOUT

KI2

ME

MB15A02PFV2E1

RIPPLE

UL

DT

KI1

LOOP

DO

CV

5C

KI3

S901W02-3704-05

ENCODER

8C

VCO oscillation frRX: 371.900~447. 387.900~395.TX: 272.000~347. 288.000~295.

Q3

RT1P141U-T111

5C

RT1N141U-T111Q902

VCO

PLLE

TX-RX UNIT (X57-8130-XX B/2): Display section TX-RX UNIT (X57-8130-XX A/2): TX-RX section

SP

MCH3914

BL

LCD DRIVER

IC901PT6554LQLCD

DISPLAY

POWER

5C

BRICL

POWERD903~D905

1SS372FD709

X1

KS2

MIC MICAMP

GND

5C

CMENCA

VOL

MEGND

AMP

L77-1944-05

TCXOMOD TCXO

ENCB

COM0~3SEG0~31

KI2KI1

KI3 KS1KS2

SW

2SB1132(Q,R)Q903

LCD ILLUMINATION

D906~D911B30-2337-05

UMG3NQ904

BRI SW

8C

MICMT

MUTESW

5C

DET

DHSB

N

8CL

DA2S101D8

PUMPCHARGE

D708DA2S101

IC704NJM12904RB1

FILTERSPLATTER

8C

SPGND

IC706(1/4)BA10324AFV AMP

SUM

8CDTMO,

5C

M62363FP-FIC705(3/8)

BA10324AFV AMPBUFFERIC706(3/4)

8C

M62363FP-F CONV.D/A

CONV.D/A

IC705(6/8)

5CTCXOMOD

VCOMOD

M62363FP-FIC705(5/8)

CONV.D/A

5C

M62363FP-F

CONV.D/A

IC705(4/8)

BRI

5C

TONE

BSHIFT

RESETPOWER

INT

TX/RX

UL

SPMAMPSWNARROWWIDE

ENCBENCA

MICMT

8RC8TC

SBC

8C

Q12SA1832(GR)F

2SC4738(GR)FQ2

SPOUTSPGND

DO

CLCE

VOL

VR901R31-0662-05

VARIABLE RESISTOR

MR VFO CALL

MHz REV FUNCENCAENCB

DIBL

16.8MHz

BLOCK DIAGRAM

TM-281A

41

Q709

IC708

2SB1694

(NARROW)

IC715

MC2858-T111

IF

SW

RX

8TC

AVR

49.95MHz

Q5

8RC

AMP

Q711

Q707

OVER

EX24064ASAS0A

Q710

MC2858-T111

ANTBUFF

BSB

XF501

POWER

INT

RT1N141U-T111

Q10 D309,D311JDP2S12CR

INT

Vgg

450kHz

BPF

LA4600

TX

MCU

Q9

SW

WIDE

ANT SW

LNA

VOLTAGE

SW

(WIDE)

1SV325F

3SK294-FP

Q713

TX/RX

IC710

5C

TA7808F-NQ

AVRTEMP2

Q503

MIXER

SW

Q504

VCO

SW

2SC5108(Y)F

CF502

2SC5108(Y)F

IC711

SW

8CL

1SV325FD508,D509

TX/RX

8R

SW

SW

IC302

E

2SB1694

50.4MHz Q505

MUTESW

Q501

8V

8R

XC6209B502P-G

TUNE

SW

VCOMOD

IC713

NARROW

EEPROM

8R

Q714

RESET

TA7805F-NQ

TUNE

30622MEP540GU

AVR

BPF

RT1N141U-T111

DTC363EU

XC61CN4002MR

RESET

XC61CN3202MR

QIN

RT1N141U-T111

Q708

MODULE

SBC

CF501

Q4

POWER

Q6

8C

SPM

8T

DRIVE

+B

D313,D314

DEMODULATOR

AF AMP

D505,D506

IC707

MCF

INT

2SJ347F

D306,D307L407CDB

8T

D500

KTC4080E-P TRIPPLER

APC

IC712

TEMP1

DETECT

RD00HVS1-T113

LPF

8R

SP

SWD502

Q303

1st Local185.950~223.9475MHz (K,M2,M3)193.950~197.9475MHz (M4)

oscillation frequency371.900~447.895MHz (K,M2,M3)387.900~395.895MHz (M4)272.000~347.995MHz (M2,M3)288.000~295.995MHz (K,M4)

RX: 136.000~173.9975MHz (K,M2,M3) 144.000~147.9975MHz (M4)TX: 136.000~173.9975MHz (M2,M3) 144.000~147.9975MHz (K,M4)

SW

RF BPF

5M

IF

Q712

HSC277

EXT

16.8MHz

3SK318

2SJ645

5V

VCO

RF BPF

8R

IC714

MCH3914(7)-H

EEPSDT

IC501

SW

RT1N141U-T111

AMPSW

Q715

RSSISQIN

8C

UA31136L

AMPCOMMAMP

D9,D10

HSB88AS-EDETECTOR

IC303NJM12904RB1

AMPRSSI

RT1N141U-T111

5V

FB

5C

MCH3914(7)-H

RA60H1317M231

L71-0655-05

L72-1034-05

L72-0999-05

8T

BSB

8.000MHzL78-1427-05

X701

UDZW18(B)D712

XINXOUT

+B8T

FUSE

F701F53-0327-15

NOISEAMP

Q502

DETECTOR

D503HSB88AS-E

NOISE

SW

Q5062SK1830F

TH702,TH703NCP18WF104J03

CL

Q7UMC4N

DIVIDERRF

IC2UPB1509GV

5C

SPOUT

5C

FB

KTC4080E-P

W/NI

2SC4617(S)

5M

M62363FP-FIC705(1/8)

CONV.D/A

W/NI

5C

FILTER

8C

AF

IC709BA10324AFV

HPF

8C

Q7062SC2412K

Q704,Q7052SK3019

MUTESW

AFMDTMFIN

D/A

IC705(7/8,8/8)

CONV.

M62363FP-F

5C

DTMF

SPGND

D/A

IC705(2/8)

CONV.

M62363FP-F

5C 8C

BA10324AFV

AMPDC

IC706(4/4)

SWBSHIFT

Q702,Q7032SC4919-S

TEMP.DETECTOR

8T

TEMP1TEMP2

8R

TONEDTMO

PLLEEVLLD

BSHIFT

RESETPOWER

INT

TX/RX

UL

EEPCKEEPWP

TXD

PTTRXD

SPMAMPSW DT

CKNARROWWIDE DO

CECL

DIENCBENCA

MICMT

8RC8TC

SBC

CMMICKEY

VOL

DTMFIN

5M

2nd_Local

BLOCK DIAGRAM

TM-281A

42

To make

G2Q503

3

IC703 IC706

Q505 XF501

7

IC704 IC704

BPF BPF

6 8Q6

ANTG2

91

To make measurements in the RF section, connect the RF level meterIn the RF section, use a 0.01μF coupling capacitor.(The display shows the SSG input value required to obtain 12dB SINA

1

G1

2 2

S

Q504

10

TX-RX Unit(Display)

D

IC705

TX-RX

MIC

To make measurements in the AF section, connect the AC level meter.AG is set so that MIC input becomes 3kHz/1.5kHz (Wide/Narrow) DEV at 1kHz MOD.

D

CF501/CF502

450kHz

7

IC706

TX-RX Unit

S

IC501

5

49.95MHz

9

IC703

G1

20

1

Center Frequency

W : –123.5dBmN : –123.5dBm

W : –120.0dBmN : –120.0dBm

W : –103.5dBmN : –104.0dBm

W : –107.5dBmN : –108.5dBm

W : 0.63VrmsN : 0.31Vrms


W : –109.0dBmN : –109.5dBm

W : –97.0dBmN : –96.0dBm

W : –80.5dBmN : –78.0dBm

W/N4.5mVrms (2.0mVrms for M4-type)

W/N0.11Vrms

W/N1.62Vrms

W/N1.32Vrms

W/N1.46Vrms

W/N1.19Vrms

Receiver Section

Transmitter Section

LEVEL DIAGRAM

TM-281A

43

To make measurements in the RF section, connect the RF Wattmeter (50Ω).

To make measurements in the AF section, connect the AC level meter.(ANT input : –53dBm, 1kHz FM, 3kHz DEV (Wide)/1.5kHz DEV (Narrow))The AF output level is adjusted for a 0.64V/8Ω by the front panel AF VOL control.

Q6

vel meter.

12dB SINAD.)

TX-RX Unit

Q97

11

Q10

PowerModule

Q303

2 D9

D10

TX-RX Unit

S

IC2

Audio Frequency

D

TX-RX Unit (VCO)

CF501/CF502

450kHz

G

IC501

D306/D307 ANT

3.5dBm –10dBm –3.7dBm65W: K,M2,M325W: M4

W : –84.5dBmN : –84.5dBm

W/N0.54Vrms

W/N0.45Vrms

W/N0.42Vrms

W/N0.45Vrms

W/N0.47Vrms

W/N10mVrms

W/N0.70Vrms

W/N0.64Vrms

4.0dBm

14 J1

IC705

12Q706

89 13

8oh

m

10

IC709

7

IC715IC709

5 1

IC709IC709

1513

41

IC302

17dBm

C60 C62 C67 C72

LEVEL DIAGRAM

TM-281A

2967-3, Ishikawa-machi, Hachioji-shi, Tokyo, 192-8525 Japan

P.O. BOX 22745, 2201 East Dominguez Street, Long Beach,

6070 Kestrel Road, Mississauga, Ontario, Canada L5T 1S8

Rembrücker Str. 15, 63150 Heusenstamm, Germany

Leuvensesteenweg 248 J, 1800 Vilvoorde, Belgium

KENWOOD House, Dwight Road, Watford, Herts.,

Amsterdamseweg 37, 1422 AC Uithoorn, The Netherlands

Via G. Sirtori, 7/9 20129 Milano, Italy

Carretera de Rubi, 88 Planta 1 A 08174 Sant Cugat del Vallès Barcelona, Spain

Talavera Business Park Building A, 4 Talavera Road, North Ryde NSW 2113 Australia

Suite 2504, 25/F, Tower 2, Nina Tower, No. 8 Yeung Uk Road,

1 Ang Mo Kio Street 63, Singapore 569110

CA 90801-5745, U.S.A.

Tsuen Wan, New Territories, Hong Kong

WD18 9EB United Kingdom

L’Etoile Paris Nord 2, 50 Allée des Impressionnistes, Bp 58416 Villepinte, 95944 Roissy Ch De Gaulle Cedex

GENERALFrequency Range TX .................................................................................. K,M4: 144~148MHz M2,M3: 136~174MHz RX ................................................................................. K,M2,M3: 136~174MHz M4: 144~148MHzMode ................................................................................ F3E (FM)Antenna Impedance ......................................................... 50ΩUsable Temperature Range .............................................. –20°C~+60°C (–4°F~+140°F)Power Supply ................................................................... 13.8V DC±15% (11.7~15.8V)Grounding Method ........................................................... Negative groundCurrent Transmit (max.) ............................................................. K,M2,M3: 14A or less M4: 8A or less Receive (at 2W output) ................................................. 1.0A or lessFrequency Stability (–20°C~+60°C) .................................. Within ±2.5ppmDimensions (W x H x D projections not included) ............ 160 x 43 x 126 mm / 6.30 x 1.69 x 4.69 inWeight .............................................................................. Approx. 1.13kg / 2.5lb

RECEIVERCircuitry ............................................................................ Double conversion superheterodyneIntermediate Frequency (1st / 2nd) .................................. 49.95MHz / 450kHzSensitivity (12dB SINAD) .................................................. Wide: 0.18µV or less Narrow: 0.22µV or lessSelectivity –6dB .............................................................................. Wide: 12kHz or more Narrow: 10kHz or more –60dB ............................................................................ Wide: 30kHz or less Narrow: 24kHz or lessSquelch Sensitivity ........................................................... 0.1µV or lessAudio Output (8Ω, 5% distortion) ..................................... 2W or higherAudio Output Impedance ................................................. 8Ω

TRANSMITTERPower Output High ............................................................................... K,M2,M3: 65W M4: 25W Low ............................................................................... K,M2,M3: Approx. 25WModulation ........................................................................ Variable reactance modulationSpurious Emissions .......................................................... –60dB or lessMaximum Frequency Deviation ........................................ Wide: ±5kHz Narrow: ±2.5kHzAudio Distortion (at 60% modulation) .............................. 3% or lessMicrophone Impedance .................................................... 600Ω

Note: All specifi cations (General, Transmitter and Receiver) are guaranteed within the

amateur radio band.Guaranteed frequency range ............................................ 144~148MHz

SPECIFICATIONS

J K L M N O P Q R SIHGFEDCBA

1

2

3

4

5

6

7

8

9

10

11

12

13

14

1

2

3

4

5

6

7

8

9

10

11

12

13

14

GSD

GSD

GSD

R812

R815

R820R821

R823IC715

C401

R828

R829C407

R835

R836

R837

R838

C70

C416

C417

C418

C805

R842

C807

R844

C809

C422

C815

F701

C824

10

C826

C828C833

FB+B

C835

C848

Q502

C851

8R

Q703Q702

Q706

Q707

L312

L313

L314

Q710

Q713

Q715

L702

R503

R506

R519

R526R527

R334

R336

CN702

R339

POWER

GND

R535PC/TV

R341

5M

R345

CNVSSRESET

UL 8C

8T

5C

TEMP1

TEMP2

R347

ADJGND

RXD

TXD

CE

EPM

BUSYSCLK

ANT

TD1

BSB

4 5

1 8

RD1

C515

RSSI

AFV

GND BPF

R748

R557

R558

R559

4 5

1 8

X701

R750R751

C523

R754

R755

DTMFIN

R756

R759

C338

R2R3

R378

R4

R760

R762

C534

C345C348

C544

C350

R777

1

C354

C355C356

C552

R786R787

C559

R791

R792

D502

R793 SQIN

CV

D312

D313

C764

C765

C572

C766

C768C769

C577

D710

C771

D712

GND

1 2 3 4

IC302

C772

C777

C394C395

C783

IC707

12526

5051 75

76

100

C789

IC712O

GI

R809

R822

R824

R825

R826

C801

C806

C810

C817

C822

C830

C832

C838

Q71

4

G S

D

R737

R739

R757

R758

R761

R765

R769

R770

R771

R772

R774

C749

C753

C763C7

67

C774

C775

C776

IC70

8

IC71

1

O

G

I

R817

R818

R819

R832

R833

R834

R841

R843

C814

C816

C820

C827

C834

C850

Q70

4

Q70

5

Q71

2

R504

R505

R507

R701

R702

R703

R704

R705

R706

R707

R708

R337

C508

C509

C702

C703

R749

C713

SPG

ND

SPG

ND

SPO

UT

SPO

UT 8C

RXD

PTT

VOL

MIC

KEY 5C CM

ENCA

ENCB D

ID

O CE CL BRI

POW

ER MIC ME

GN

D

1 22

R752

R753

C718

C719

C720

R763

R764

R766

R767

R768

R773

R775

R776

R778

R779

R780

R782

R783

R784

R785

D50

1

R795

C761

C778

C584

C779

C585

C586

C587

C781

C782

R813

C408

C409

C412

Q50

6

Q70

8

R508

R509

CN50

1

R520

R521

R529

R338

R340R3

42

R344

R348

TH50

1

R351

TH70

3

C514

C524

C525

C333

C334

R377

C530

C342 C3

47

D30

1

C556

D30

5

D50

3D

504

C565

D31

4

D31

6

C575

IC30

3

C579



Component side

Foil side

Layer 1Layer 2

TM-281A PC BOARD PC BOARD TM-281A

J79-0316-09 A/2

Ref. No. Address

IC302 3K

IC303 8P

IC707 9F

IC708 7E

IC711 6G

IC712 7F

IC715 9B

Q502 11N

Q506 8R

Q702 7F

Q703 7F

Q704 10I

Q705 10I

Q706 10I

Q707 6F

Q708 10O

Q710 10O

Q712 10E

Q713 6D

Q714 5E

Q715 9D

D301 7O

D305 8P

D312 8Q

D313 5Q

D314 5R

D316 7Q

D501 12K

D502 12K

D503 11O

D504 10O

D710 6F

D712 6F


1

2

3

4

5

6

7

8

9

10

11

12

13

14

1

2

3

4

5

6

7

8

9

10

11

12

13

14

GSD SD

G

SDG

CF501(WIDE)

C35

R801

R803R804

R808

C42

C43

C48

R810

C49

R811

R814R816

C50C54

C59

C400C402

C403

R827

C404

C6745

18

R831

C410C413

C415

C72

C800

C802

C808

C421

C823

TC1

C829

TC2

C6

C837

D5D6

D8

+

C847

Q501

Q503

C853

C854

+

L302

Q701

L305

L503

L310

L504

L506

L508

L315

L316

L319

L318

L510

L512

L514

L515

R304R307

R501

R314

L5

+ + +

R510

L8L9

R511

XF501

R515

R517

R710

R713

R714

R716

L12

R523R717

L13

R524

R718

R719

R331

L16L17

R528

L18

L19

L20

R531

R725

GND

ADJR532

R726R727

IC1

R536

C306

R537 R538

C308

R539

R346

R730

R349

C502

C503 C504C505

C312

R736

R543

GND BPFC507

R10

R350

R546

R13

C318

R549

R16

R17R18

C510

89

116

R19

C511

TH702

C513

R550R551

R745

C516

R552R553

R747

R20

R554

C518

R555

R21

CV

R22

C329

Q2

R27

Q3

Q73

1

4

5

Q8

R560

C331

C332

C528

R33

R35

C722

R37

C725

C726

C727

R7

R8

C340

C728

C729

C535

R380

C538

R40

R41

R44

C731

R46

C733

C541

C735

C736C737

C738

C545

C739

C546

C547C548

C549

C742

C743

C550

C744

C551

R781

C553

C747

C554

C555

C365

R789

C751

D309

C752

C560

R790C562

C757

C758

R794

D505

D311

R7967

78

114

8

1 14

C566

R797

C567

D508

D509

C569

C570

C571

D708

C574

C576

C578

D714

+

C581

C582

C397C399

X1

IC703IC704

C784

IC705

C785C786

C787

C788

IC710

3

1

4

5

IC713 G

O

I

+

C793

IC714

O

GI

C795

C796

C11

C14

C15

C16

C405

C406

D30

6

D30

7

L317

C34

C38

C41

C46

C52

C53

C55

C56

C58

Q10

C65

C68

C69

C71

C420

L320

D4

D7

D9

Q50

4

Q50

5

G1

S

SD

DG

2

G1

G2

L507

L511

D10

L7

L10

L11

L14

L21

R534

R540

R541R5

42

R544

R545

R547

R556

R24

R25

R26

R29

Q5

R31

R34

C537

C539

R42

R43R4

5

C557

C558

C561

D50

6

C568

C573 C6

0C6

2C6

3

C64

C66

R512

R514

R525

IC2

C517

C519

C520

C521

C522

Q6

Q9

C527C5

33

IC50

1

C583

R522

C36

C39

C45

C51

C57

D3

L502

R502

L6

L15

C506

CD50

1R2

8

Q4

R30

R32

R38

C20

C21

C23C2

5

C27

C28

C29

C61

C804

C811

C1

C3 C4

C5

C7

C91011

120

D1

D2

Q30

3

G S D

C849

L308

L309

Q70

9

Q71

1

R312

L1

L2

L3

R326

R332

R333

C309

C310

R11

R12

R15

R23

C328

Q1

C330

R1R5

R6

R9

C343

C344

C10

C12C1

7C1

8

CF50

2(N

ARR

OW

)

R800

R802

R805

R806

R807

C821

L701

R711

R715

R721

R722

R723

R724

R728

R729

R733

R734

R735

R738

R740

R741

R742

R743

1213

124

R744

R746

C724

C732

C734

C740

C745

C746

C748

C750

C754

R799

D70

2

D70

4

D70

5

D70

6

D70

9

D71

1

IC70

9

C790

C794

C797 C7

98

4

45

18

5

18

C799

C818

C825

C831

C840

C844

IC70

6

J701EXT. SP

C836

C839

R830

L505



Component side

Foil side

Layer 1Layer 2


J79-0316-09 A/2

Ref. No. Address IC1 9I IC2 8F IC501 11F IC703 11M IC704 11L IC705 9K IC706 12K IC709 10K IC710 8J IC713 6O IC714 8M Q1 10I Q2 10I Q3 8G Q4 10H Q5 9F Q6 9F Q7 9F Q8 10F Q9 9G Q10 8F Q303 7H Q501 11H Q503 11E Q504 10C Q505 10A Q701 12M Q709 7I Q711 7I D1 10I D2 8I D3 10G D4 10F D5 10G D6 10F D7 9F D8 10F D9 8E D10 8E D306 6B D307 6C D309 6A D311 6A D505 11B D506 11B D508 9A D509 8A D702 12N D704 12N D705 12O D706 12O D708 12M D709 12M D711 11L D714 4M


1

2

3

4

5

6

7

8

9

10

11

12

13

14

1

2

3

4

5

6

7

8

9

10

11

12

13

14

Q903

B

C

E

Q904B

BE

C

C

L901

R901R909

R911

R913

R916

R917

R919

CN901

C903

C910

C924

C927

C928

SP+

SP–

IC901

116

17

32

33 48

49

64

S901ENCODERVR901

CALL VFO MR REV FUNC

1

2

8

CM

HOOK

ME

GND

MBL

MIC

PTT

8C

CM

HOOK

ME

GND

MBL

MIC

PTT

8C

7

J901

D903

D904

D905

D906

D907

D908

D909

D910

D911

CP901

Q901

Q902

R902

R903

R904

R905

R906

R908

R910

R914

R915

R918

R920

R921 R

922 R923

R924

C901

C902

C912

C915

C916

C917

C918

C920

C921

C922

C926

C929

D901

D902

R912

SPG

ND

1 22

SPG

ND

SPO

UT

SPO

UT 8C

RX

D

PTT

VO

L

MIC

KEY 5C

CM

ENC

A

ENC

B DI

DO CE CL

BR

I

POW

ER

MIC

ME

GN

D





Component side

Foil side

Layer 1Layer 2

Component side

Foil side

Layer 1Layer 2


J79-0316-09 B/2

J79-0316-09 B/2

Ref. No. Address

D903 6K

D904 6G

D905 6O

D906 4F

D907 4G

D908 4H

D909 4I

D910 4L

D911 4J

Ref. No. Address

IC901 12K

Q901 11F

Q902 11F

Q903 11G

Q904 11F

D901 9D

D902 10D

-t

-t-t

C23

470p

C83

3

1000

p

C34

7

0.1u

PTT

C10

68p

R24

100k

C68

1000

p

C56

6

1000

p

L319

5T

C75

7

10u

C80

2

R773

0

C34

1000

p

L318 5T

R23

10k

C46

0.5p

C43

470p

C74

8

1000

p

R71

9

1.2k

C59

470p

R502

100

B

5M

C74

7

10u

R790

12k

R514

4.7k

C41

2

1000

p

IC713TA7805F-NQ

2

GND

3

IN1

OUT

R550

10k

C76

6

5p

R79

9

470k

L305

10n

2SJ645Q714

R79

4

120k

C79

0

0.03

3u

C83

2

0.1u

R814

1.5k

C73

9

1000

p

5C

R71

5

680

R76

5

1k

R797

2.7k

R739

22k

C519

10u

C56

5

1000

p

R33

8

150k

C72

4

10u

R524

390k

BS

B

C72

7

1000

p

C406

1000p

C55

0.5p

R50

9

0

C64

220p

C78

6

0.03

9u

R82

2

330k

TC

2

6p

R17

470

C80

6

10u

C778

1uR73

3

680k

C55

0

1000

p

C74

6

0.1u

R35

1

47k

R35

1

47k

C54

0.3p

R75

7

47k

R55

5

100k

R55

5

100k

C52

5

0.22

u

R745

C84

9

10u

8C

C507

0.01u

C83

4

1000

p

C752

3900p

R34

6

220

R811

0

TH

501

470k

L502

330n

8R

5C

5C

C73

7

1000

p

C73

6

10u

C53

4

0.03

9u

C53

5

1000

p

L3

R71

8

1.5k

R819

12k

C82

1

1000

p

8T

D9

L320

5T

R19

2.7k

R74

6

82k

C71 39p

R812

2.2k

R334

100

C767

3p

C80

7

10u

C55

7

5pC54

8

0.01

u

R782

1k

R35

8

220k

R50

7

10k

C62

2p

R722

1.5k

C65

1000p

8T

C50

2

0.01

u

C56

22u1

6

L315

9.5T

R728

82k

R82

4

470k

Q712DTC363EU

C54

4

0.1u

R80

7

1M

C57

9

1000

p

R26

47k

R72

4

6.8k

R53

7

470k

R80

5

5.6k

C82

40.

1u

2SB1694Q711

C74

9

0.01

u

R21

1.5k

5C

R721

D5

HVC359

C84

0

0.1u

D3

HV

C35

9

L317

1.5TC42

470p

8R

CE

5M

C28

470p

R77710k

C51

0

0.01

u

RXD

D307

L504

330n

CNVSS

C12

10u

C40

8

0.5p

D501MC2858-T111

C48

1000

p

R41

10k

R71

4

100k

R795

5.6k

R52

0

470k

C79

8

0.22

u

C55

2

1000

p

R810

15k

R813

47k

R81

7

47k

R54

9

150

C82

6

1000

p

R11

10k

D4

HV

C35

9

2SC4919-SQ701

C523

5600p

R80

4

12k

C733

0.1u

C785

0.01u

2SC4738(GR)FQ2

2SA1832(GR)FQ1

C573

4p

5M

C816

0.22u

C70

1000

p

C77

4

1800

p

D6HVC359

5M

R730

82k

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CO

M1

CO

M2

CO

M3

KS

1

KS

2

NC

NC

NC

SEG12

SEG13

SEG14

SEG15

SEG16

SEG17

SEG18

SEG19

SEG20

SEG20

SEG22

SEG23

SEG24

SEG25

SEG26

SEG27

XF501

CF501

CF502

C78

4

0.01

u

C78

7

0.01

u

R901

0

C405

1000p

R380

0

ANT

C420

4p

18p

C41

8

4p

D313HSB88AS-E

C41

6

1000

p

C40

7

1000

p

D312

RB521S-30

R34

7

1.5k

C40

1

1000

p

D306L407CDB

L407CDB

D30

9

JDP

2S12

CR

C40

3

27p

C36

5

6p

C34

8

C34

5

100p

C35

4

22p

L314

L313

L312

C34

3

1000

p

C34

0

220p

1000

p

R33

2

10

R33

3

100

R331

R33

6

47

10

C33

1

C32

9

1000

p

0.02

2u

L309

120n

C332

150p

L310

47n

L308

8.2n

C32

8

13p

C33

0

2.5p

8T

R350

10

C31

8

1000

p

R31

4

22k

R31

2

4.7k

R32

6

12k

R34

9

220

C40

0

1000

p

D31

6

RB

521S

-30

C39

50.

1u

C39

4

1000

p

R34

5

100k

R34

4

100k

R34

1

150k

C33

8

1000

p

R33

7

100

C33

4

1000

p

C33

3

4.7u

R34

0

22k

R34

2

1.5k

R33

9

10k

DA2S101

D305

R557

100k

C57

9

1000

p

TV TV

19

20

21

22

MC

2850

MC

2850

MC

2850

C70

20.

047u

C70

3

0

1k

R706

0

R708

0

R707

1k

R705 1k

R704 1k

R702

100

R703

100

1

1

R83

1

0

0.04

7u

1000

p10

00p

1000

p

R83

0

0

R83

2

0

R83

3

0

1000

p

C83

9

330u

25

C81

8

22u

2

VSS

3VIN VOUT 1

XC61CN4002MR

2

VSS

3 VIN VOUT 1

C85

0

10u

C85

1

10u

C81

4

10u

1N

C2

CE

3V

SS

45

VIN

VO

UT

C84

8

10u

10u

C81

1

0.1u

R560

0

R55

6

0

D50

9C

576

18p

D50

8

1SV

325F

C57

1

18p

1SV

325F

C57

5

1000

p

R557

100k

R559

27k

C57

7

1000

pR

558

47k

2SK1830FQ506

8T

D50

5C

554

24p

L510

68n

1SV

325F

C560

1000p

R54

5R

546

100

L511

68n

1SV

325F

R54

4

100k

L512

330n

C56

1

1000

p

1k

C58

2

1p

R536

560

R52

3

0

L505

3.3u

N-DET

RSSI

IFOUT

QUAD

C50

6

47p

0.1u

C515 0.1u

C517

R51

2

560k

C51

3

330p

C516

R511

22k

10

9

330p

R51

0

1k

100p

C518

C58

3

4p

C522

27p

CD

501 R

517

1.8k

C52

1

0.01

u

FILOUT FILOUT

C52

4

0.1u

C55

9

1000

p

R526

0

R52

7

470k

D504DA2S101

C584

0.1u

C585

0.1u

C586

0.1u

C587

0.1u

R75

4

47k

R844

10k

NC

NC

5M

5M

R843

47k

CE

R841

47k

EPM

BUSY

R842

10k

SCLK

TD1RD1

RESET

R756

10k

R762

10k

R829

0

R828

0

R74

8

22k

C31

2

12p

8p6p

HSC277

R532

0

C30

6

1000

p

R30

4

1k

VC +DC

GNDOUTPUT

C21

470p

R18 0

R1

100k

C1

22u

R5

10k

FRQO

1k

1k1k

68p

R71

3

820

R835

R836

R837

R838

K

M3

M2

M4

X57-8130-XX

-23

-10

-21

-22

0

R766

0

NO

0 0

0

R767

NO

NO

0

R768

NO

NO

NO

K

M3

M2

M4

X57-8130-XX

-23

-10

-21

-22

C726

0.039u

0.039u

0.039u

0.068u

1000p

1000p

680p

C732

1000p 0.022u

0.022u

0.039u

0.022u

C734

0

R717

0

NO

0

R721

NO

NO

0

R835

NO

NO

NO18k

R837

10k

18k

18k

750k

750k

1M

750k

R838R836

NO

NO

NO

NO

NO

NO

C85

3

22u

C85

4

22u

R82

6

47k

PTT

BRI

RXD

POWER

VOL

8C

5C

DO

CL

CE

DI

MICKEY

ENCB

CM

ENCA

MIC

SPGND

SPOUT

SPOUT

SPGND

SPOUT

C91

0

1000

p

1k x4

R91

6

18k

18k

100k

D905R915

1.5k 330

330D908

D910

D907

D909

D911B30-2337-05

B30-2337-05

B30-2337-05

B30-2337-05

B30-2337-05

D90

2

UD

ZW

6.2(

B)

REVERSECONNECTIONPROTECTIOM

D901

ANT SWITCH

D316

PROTECTION

PROTECTION

DC SWITCH (SB)

DRIVE AMP

VOLTAGEPROTECTION

PC/TV SWITCH

MIC MUTE

D306,307

POWER MODULE

PROTECTION

OP AMP

5V AVR

5V AVR

OP AMP

OP AMP

OSCILLATOR

SWITCH BEATSHIFTSWITCH

CONTROLFREQENCY

VCO

CONTROLFREQENCY

VCO

SURGEABSORPTION

D906-911

D10 HSC277

EXT SP

RX VCO

TX VCO

D9,10

RA60H1317M231IC302

1 2 3 4

RF

_IN

VG

G

VD

D

RF

_OU

T

4A

ANT

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

SPGND

GND

ME

19

20

21

22

1

PTT

BRI

RXD

POWER

VOL

8C

5C

DO

CL

CE

DI

MICKEY

ENCB

CM

ENCA

MIC

SPGND

SPOUT

SPOUT

LCD ILLUMINATION

KEY ILLUMINATION

INT SP

+

-

L77-1944-05

L78-1427-05

L71-0655-05

CN501

STRIP LINE

PC/TV

R:1.23V

R:7.52V

R:3.20V

R:6.78V

R:0.71V

R:4.93V

R:2.62V

R:7.79V

R:13.8V

T:0.77V

T:2.71V

R:2.48V

R:4.94V

BEAT SHIFT ON:4.87V

T:1.58V

R:4.94V

R:5.00V

R:4.84VT:0V

R:13.8V

R:2.29VR:4.93V

R:0.73VT:0.72V

R:4.56V

R:3.35V

R:5.85V

R:6.03V R:4.82VT:4.76V

4.94V

R:0.71V

R:0.45V

R:0.71V

R:1.81V

R:3.34V

SQ ON:0V

R:2.50V

R:2.85V

R:7.59V

R:0V

N:0VW:4.90V

T:7.67V

R:1.02V

R:3.22V

5.00V

R:5.00V

R:6.85V

T:6.77V

R:1.07V

R:4.94V

T:7.73V

R:2.51V

R:7.82V

R:0.76V

R:1.47V

R:7.82V

R:5.00V

R:6.91V

R:2.19V

7.81V

5.00V

7.56V

R:5.59V

T:5.55V65W:4.29V

25W:0.77V

R:3.20V

T:7.72V

R:7.04V

R:2.21V

R:0.76V

R:7.81V

T:3.68V

W:0VN:4.90V

R:4.94V

BEAT SHIFT OFF:0V

R:5.96V

SQ OFF:4.94V

25W:3.43V

65W:1.25V

T:4.87V

R:7.07V

T:13.8V

R:5.98V

5.00V

4.96V

R:7.82VR:5.00V

Q709

KTC4075E(Y,GR)

IC708

2SB1694

(NARROW)

IC715

MC2858-T111

IF

SW

RX

8TC

AVR

49.95MHz

Q5

8RC

AMP

Q711

Q707

OVER

8C

EX24064ASAS0A

Q710

MC2858-T111

ANTBUFF

BSB

PTT/TXD

XF501

POWER

INT

RT1N141U-T111

Q10

Q701

D309,D311JDP2S12CR

AGC

INT

Vgg

450kHz

BPF

LA4600

TX

MCU

Q9CK

SW

WIDE

FILTER

ANT SW

KS1

8C

LNA

VOLTAGE

RXD

8CL

NJM2100V-ZB SW

(WIDE)

1SV325F

PLL IC

3SK294-FP

Q713

Fin

TX/RX

IC710

5C

TA7808F-NQ

AVR

SW

TEMP2

CM

KEY BACKLIGHT

Q503

MIXER

SW

SPOUT

Q504

VCO

SW

MIC

FILTER

2SC5108(Y)F

CF502

2SC5108(Y)F

B30-2337-05

IC711

SW

SPGND

8CL

1SV325F

SW

D508,D509

TX/RX

Q8

8R

SW

DI

SW

IC302

E

RXD

2SB1694

50.4MHz Q505

MUTESW

Q501

8V

8R

2SC4919-SIC703

XC6209B502P-G

TUNE

SW

VCOMOD

IC713

NARROW

EEPROM

Q901

8R

Q714

RESET

TA7805F-NQ

MIC

TUNE

30622MEP540GU

AVR

16.8MHz

BPF

RT1N141U-T111

DTC363EU

XC61CN4002MR

RESET

XC61CN3202MR

MICKEY

SQIN

RT1N141U-T111

8C

Q708

MODULE

SBC

CF501

Q45C

MICKEY

POWER

Q6

2SC4649(N,P)

8C

SPM

PTT/TXD

CE

8T

DRIVE

IC1

+B

D313,D314

DEMODULATOR

SPOUT AF AMP

KI2

D505,D506

ME

IC707

MCF

INT

2SJ347F

D306,D307L407CDB

MB15A02PFV2E1

RIPPLE

8T

UL

D500

KTC4080E-P TRIPPLER

APC

DT

KI1

IC712

LOOP

TEMP1

DETECT

DO

CV

5C

RD00HVS1-T113

LPF

KI3

S901W02-3704-05

ENCODER

8C

8R

SP

SWD502

Q303

1st Local185.950~223.9475MHz (K,M2,M3)193.950~197.9475MHz (M4)

VCO oscillation frequencyRX: 371.900~447.895MHz (K,M2,M3) 387.900~395.895MHz (M4)TX: 272.000~347.995MHz (M2,M3) 288.000~295.995MHz (K,M4)

RX: 136.000~173.9975MHz (K,M2,M3) 144.000~147.9975MHz (M4)TX: 136.000~173.9975MHz (M2,M3) 144.000~147.9975MHz (K,M4)

SW

RF BPF

Q3

5M

IF

RT1P141U-T111

Q712

5C

RT1N141U-T111

HSC277

EXT

16.8MHz

3SK318

2SJ645

Q902

5V

VCO

RF BPF

8R

IC714

PLLE

TX-RX UNIT (X57-8130-XX B/2): Display section TX-RX UNIT (X57-8130-XX A/2): TX-RX section

SP

MCH3914(7)-H

BL

LCD DRIVER

IC901PT6554LQLCD

DISPLAY

POWER

5C

BRICL

POWERD903~D905

1SS372FD709

EEPSDT

X1

IC501

SW

RT1N141U-T111

AMPSW

Q715

RSSISQIN

8C

KS2

MIC MIC

UA31136L

AMPCOMMAMP

D9,D10

HSB88AS-EDETECTOR

IC303NJM12904RB1

AMPRSSI

RT1N141U-T111

5V

FB

AMP

GND

5C

CMENCA

VOL

MEGND

AMP

L77-1944-05

5C

MCH3914(7)-H

RA60H1317M231

L71-0655-05

L72-1034-05

L72-0999-05

8T

TCXOMOD TCXO

BSB

8.000MHzL78-1427-05

X701

ENCB

COM0~3SEG0~31

UDZW18(B)D712

KI2KI1

KI3 KS1KS2

SW

2SB1132(Q,R)Q903

LCD ILLUMINATION

D906~D911B30-2337-05

UMG3NQ904

BRI SW

8C XINXOUT

+B8T

FUSE

F701F53-0327-15

MICMT

MUTESW

5C

NOISEAMP

Q502

DETECTOR

D503HSB88AS-E

NOISE

SW

Q5062SK1830F

TH702,TH703NCP18WF104J03

8CL

DA2S101D8

Q7UMC4N

DIVIDERRF

IC2UPB1509GV

5C

PUMPCHARGE

SPOUT

5C

FB

KTC4080E-P

W/NI

2SC4617(S)

5M

D708DA2S101

IC704NJM12904RB1

FILTERSPLATTER

8C

SPGND

IC706(1/4)BA10324AFV AMP

SUM

8CDTMO,

5C

M62363FP-FIC705(3/8)

BA10324AFV AMPBUFFERIC706(3/4)

8C

M62363FP-F CONV.D/A

CONV.D/A

IC705(6/8)

5CTCXOMOD

VCOMOD

M62363FP-FIC705(5/8)

CONV.D/A

5C

M62363FP-FIC705(1/8)

CONV.D/A

W/NI

5C

FILTER

8C

AF

IC709BA10324AFV

HPF

8C

Q7062SC2412K

Q704,Q7052SK3019

MUTESW

AFMDTMFIN

D/A

IC705(7/8,8/8)

CONV.

M62363FP-F

5C

DTMF

SPGND

D/A

IC705(2/8)

CONV.

M62363FP-F

5C 8C

BA10324AFV

AMPDC

IC706(4/4)

SWBSHIFT

Q702,Q7032SC4919-S

TEMP.DETECTOR

8T

TEMP1TEMP2

M62363FP-F

CONV.D/A

IC705(4/8)

BRI

5C

8R

TONE

TONEDTMO

PLLEEVLLD

BSHIFT

RESETPOWER

INT

TX/RX

UL

EEPCKEEPWP

TXD

PTTRXD

SPMAMPSW DT

CKNARROWWIDE DO

CECL

DIENCBENCA

MICMT

8RC8TC

SBC

CMMICKEY

VOL

DTMFIN

5M

8C

Q12SA1832(GR)F

2SC4738(GR)FQ2

SPOUTSPGND

DO

CLCE

VOL

VR901R31-0662-05

VARIABLE RESISTOR

MR VFO CALL

MHz REV FUNCENCAENCB

DIBL

2nd_Local

16.8MHz

To make measurements in the RF section, connect the RF Wattmeter (50Ω).

G2Q503

3

IC703 IC706

Q505 XF501

7

IC704

To make measurements in the AF section, connect the AC level meter.(ANT input : –53dBm, 1kHz FM, 3kHz DEV (Wide)/1.5kHz DEV (Narrow))The AF output level is adjusted for a 0.64V/8Ω by the front panel AF VOL control.

IC704

BPF BPF

6 8Q6

ANTG2

91

To make measurements in the RF section, connect the RF level meter.In the RF section, use a 0.01μF coupling capacitor.(The display shows the SSG input value required to obtain 12dB SINAD.)

TX-RX Unit

Q971

G1

11

2Q10

PowerModule

2

Q303

2

S

Q504

10 D9

D10

TX-RX Unit

S

TX-RX Unit(Display)

IC2

D

Audio Frequency

IC705

D

TX-RX Unit (VCO)

MIC

To make measurements in the AF section, connect the AC level meter.AG is set so that MIC input becomes 3kHz/1.5kHz (Wide/Narrow) DEV at 1kHz MOD.

D

CF501/CF502

450kHz

7G

IC706

TX-RX Unit

S

IC501

5

49.95MHz

D306/D3079

IC703

G1

20

1 ANT

Center Frequency

3.5dBm –10dBm –3.7dBm65W: K,M2,M325W: M4

W : –123.5dBmN : –123.5dBm

W : –120.0dBmN : –120.0dBm

W : –103.5dBmN : –104.0dBm

W : –107.5dBmN : –108.5dBm



W : –109.0dBmN : –109.5dBm

W : –97.0dBmN : –96.0dBm

W : –80.5dBmN : –78.0dBm

W : –84.5dBmN : –84.5dBm

W/N0.54Vrms

W/N0.45Vrms

W/N0.42Vrms

W/N0.45Vrms

W/N0.47Vrms

W/N10mVrms

W/N0.70Vrms

W/N0.64Vrms

4.0dBm

W/N4.5mVrms (2.0mVrms for M4-type)

W/N0.11Vrms

W/N1.62Vrms

W/N1.32Vrms

W/N1.46Vrms

W/N1.19Vrms

14 J1

IC705

12Q706

89 13

8oh

m

10

IC709

7

IC715IC709

5 1

IC709IC709

1513

41

IC302

17dBm

C60 C62 C67 C72

Receiver Section

Transmitter Section

Documents

TM-281A144MHz FM TRANSCEIVER