Service STDF2

STDF-2 (MCA) S/M

SERVICEMANUAL

Published in Apr. ’9819270761Revision 1

R

STDF-2

ST

DF

-2

SERVICEMANUAL

STDF-2

Safety precautions

This booklet provides safety warnings and precautions for our servicepersonnel to ensure the safety of their customers, their machines as wellas themselves during maintenance activities. Service personnel areadvised to read this booklet carefully to familiarize themselves with thewarnings and precautions described here before engaging inmaintenance activities.

Safety warnings and precautions

Various symbols are used to protect our service personnel andcustomers from physical danger and to prevent damage to theirproperty. These symbols are described below:

DANGER: High risk of serious bodily injury or death may result frominsufficient attention to or incorrect compliance with warningmessages using this symbol.

WARNING: Serious bodily injury or death may result from insufficientattention to or incorrect compliance with warning messagesusing this symbol.

CAUTION: Bodily injury or damage to property may result frominsufficient attention to or incorrect compliance with warningmessages using this symbol.

SymbolsThe triangle ( ) symbol indicates a warning includingdanger and caution. The specific point of attention is showninside the symbol.

General warning.

Warning of risk of electric shock.

Warning of high temperature.

indicates a prohibited action. The specific prohibition isshown inside the symbol.

General prohibited action.

Disassembly prohibited.

indicates that action is required. The specific actionrequired is shown inside the symbol.

General action required.

Remove the power plug from the wall outlet.

Always ground the copier.

1. Installation Precautions

WARNING

•Do not use a power supply with a voltage other than that specified.Avoid multiple connections to one outlet: they may cause fire or electricshock. When using an extension cable, always check that it isadequate for the rated current. ..............................................................

•Connect the ground wire to a suitable grounding point. Not groundingthe copier may cause fire or electric shock. Connecting the earth wireto an object not approved for the purpose may cause explosion orelectric shock. Never connect the ground cable to any of the following:gas pipes, lightning rods, ground cables for telephone lines and waterpipes or faucets not approved by the proper authorities. ......................

CAUTION

•Do not place the copier on an infirm or angled surface: the copier maytip over, causing injury. ..........................................................................

•Do not install the copier in a humid or dusty place. This may cause fireor electric shock. ....................................................................................

•Do not install the copier near a radiator, heater, other heat source ornear flammable material. This may cause fire. ......................................

•Allow sufficient space around the copier to allow the ventilation grills tokeep the machine as cool as possible. Insufficient ventilation maycause heat buildup and poor copying performance...............................

•Always handle the machine by the correct locations when moving it. ...

•Always use anti-toppling and locking devices on copiers so equipped.Failure to do this may cause the copier to move unexpectedly ortopple, leading to injury. .........................................................................

•Avoid inhaling toner or developer excessively. Protect the eyes. If toneror developer is accidentally ingested, drink a lot of water to dilute it inthe stomach and obtain medical attention immediately. If it gets into theeyes, rinse immediately with copious amounts of water and obtainmedical attention. ..................................................................................

•Advice customers that they must always follow the safety warningsand precautions in the copier’s instruction handbook............................

2. Precautions for Maintenance

WARNING

•Always remove the power plug from the wall outlet before startingmachine disassembly. ............................................................................

•Always follow the procedures for maintenance described in the servicemanual and other related brochures. .....................................................

•Under no circumstances attempt to bypass or disable safety featuresincluding safety mechanisms and protective circuits. ............................

•Always use parts having the correct specifications. ..............................

•Always use the thermostat or thermal fuse specified in the servicemanual or other related brochure when replacing them. Using a pieceof wire, for example, could lead to fire or other serious accident. .........

•When the service manual or other serious brochure specifies adistance or gap for installation of a part, always use the correct scaleand measure carefully............................................................................

•Always check that the copier is correctly connected to an outlet with aground connection. ................................................................................

•Check that the power cable covering is free of damage. Check that thepower plug is dust-free. If it is dirty, clean it to remove the risk of fire orelectric shock. ........................................................................................

•Never attempt to disassemble the optical unit in machines using lasers.Leaking laser light may damage eyesight. ............................................

•Handle the charger sections with care. They are charged to highpotentials and may cause electric shock if handled improperly. ............

CAUTION

•Wear safe clothing. If wearing loose clothing or accessories such asties, make sure they are safely secured so they will not be caught inrotating sections. ...................................................................................

•Use utmost caution when working on a powered machine. Keep awayfrom chains and belts. ...........................................................................

•Handle the fixing section with care to avoid burns as it can beextremely hot. ........................................................................................

•Check that the fixing unit thermistor, heat and press rollers are clean.Dirt on them can cause abnormally high temperatures. ........................

•Do not remove the ozone filter, if any, from the copier except forroutine replacement. ..............................................................................

•Do not pull on the AC power cord or connector wires on high-voltagecomponents when removing them; always hold the plug itself. .............

•Do not route the power cable where it may be stood on or trapped. Ifnecessary, protect it with a cable cover or other appropriate item. .......

•Treat the ends of the wire carefully when installing a new charger wireto avoid electric leaks. ...........................................................................

•Remove toner completely from electronic components. ........................

•Run wire harnesses carefully so that wires will not be trapped ordamaged. ...............................................................................................

•After maintenance, always check that all the parts, screws, connectorsand wires that were removed, have been refitted correctly. Specialattention should be paid to any forgotten connector, trapped wire andmissing screws. .....................................................................................

•Check that all the caution labels that should be present on the machineaccording to the instruction handbook are clean and not peeling.Replace with new ones if necessary. .....................................................

•Handle greases and solvents with care by following the instructionsbelow: ....................................................................................................· Use only a small amount of solvent at a time, being careful not to spill.Wipe spills off completely.

· Ventilate the room well while using grease or solvents.· Allow applied solvents to evaporate completely before refitting thecovers or turning the main switch on.

· Always wash hands afterwards.

•Never dispose of toner or toner bottles in fire. Toner may causesparks when exposed directly to fire in a furnace, etc. ..........................

•Should smoke be seen coming from the copier, remove the powerplug from the wall outlet immediately. ....................................................

3. Miscellaneous

WARNING

•Never attempt to heat the drum or expose it to any organic solventssuch as alcohol, other than the specified refiner; it may generate toxicgas. ........................................................................................................

1-1-1

192

CONTENTS

I THEORY AND CONSTRUCTION SECTION1-1 Specifications

1-1-1 Specifications ................................................................................ 1-1-11-2 Mechanical Construction

1-2-1 Parts names and their functions .................................................... 1-2-11-2-2 Machine cross section ................................................................... 1-2-21-2-3 Drive system ................................................................................. 1-2-31-2-4 Mechanical construction ................................................................ 1-2-4

II ELECTRICAL SECTION2-1 Electrical Parts Layout

2-1-1 Electrical parts layout .................................................................... 2-1-12-2 Detection of Paper Misfeed

2-2-1 Original misfeed detection ............................................................. 2-2-12-2-2 Original misfeed detection conditions ........................................... 2-2-2

III SET UP AND ADJUSTMENT SECTION3-1 Installation

3-1-1 Unpacking and installation ............................................................ 3-1-13-2 Assembly and Disassembly

3-2-1 Precautions for assembly and disassembly ................................... 3-2-13-2-2 Procedure for assembly and disassembly ..................................... 3-2-2

3-3 Troubleshooting3-3-1 Image formation problems ............................................................ 3-3-13-3-2 Original misfeeds .......................................................................... 3-3-33-3-3 Electrical problems ........................................................................ 3-3-43-3-4 Mechanical problems .................................................................... 3-3-5

3-4 AppendixesTiming chart No. 1 ...................................................................................... 3-4-1Timing chart No. 2 ...................................................................................... 3-4-2DF size detection PCB ............................................................................... 3-4-3

1-1-3

192

CONTENTS

1-1 Specifications

1-1-1 Specifications ...................................................................................... 1-1-1

192

1-1-1

1-1-1 Specifications

Original feed system ................ Automatic feedOriginals ................................... SheetsOriginal weight ......................... 45 – 90 g/m2

Original paper .......................... Plain paper, thermal paper, art paper, colored paperand carrier sheet

Original sizes ........................... A3 – A5R, folio/11" × 17" – 51/2" × 81/2"RNo. of originals ......................... Up to 50 sheetsPower source ........................... Electrically connected to the copierMachine dimensions ................ 544 (W) × 456 (D) × 107 (H) mm

217/16" (W) × 1715/16"(D) × 43/16" (H)Weight ...................................... Approx. 4.7 kg/10.3 lbs

1-1-5

192

CONTENTS

1-2 Mechanical Construction

1-2-1 Parts names and their functions ......................................................... 1-2-11-2-2 Machine cross section ........................................................................ 1-2-21-2-3 Drive system ....................................................................................... 1-2-31-2-4 Mechanical construction ..................................................................... 1-2-4

192

1-2-1

1-2-1 Parts names and their functions

Figure 1-2-1

1 Original table2 Auxiliary original table3 Original insert guides4 DF cover

4 3 1 2

192

1-2-2

1-2-2 Machine cross section

Figure 1-2-2 Machine cross sectional view

Original path

192

1-2-3

1-2-3 Drive system

Figure 1-2-3 Drive system

1 DF motor gear2 Gear 15/21/403 Gear 15/294 Original feed gear 315 Original feed pulley gear6 Idle gear 14

7 3 6 5 4

2 ! 9

909

8

1

As viewed from machine rear

7 Forwarding pulley gear8 Eject gear 289 DF pulleys 160 DF belt! DF tension pulley

192

1-2-4

1-2-4 Mechanical construction

The sheet-through DF consists of the parts shown in Figure 1-2-4. An original placed on theoriginal table is conveyed onto the DF contact glass in sync with the scanning timing of thescanner.When the main switch is pressed or original feed is completed, the DF original feed pulleyrotates opposite to the original feed direction, the forwarding spring touches the originalstopper and the DF forwarding pulley rises and stops at the standby position.

Figure 1-2-4

1 DF forwarding pulley2 DF original feed pulley3 DF separation pulley4 DF conveying pulley 15 DF conveying roller 16 DF conveying pulley 27 DF conveying roller 28 DF eject roller

9 DF eject pulley0 Forwarding spring! Original stopper@ Upper DF housing# DF original feed guide$ Original table% DF contact glass^ DF timing switch (DFTSW)

%^ 3

98

#1@!20

4

$

6

75

192

1-2-5

Figure 1-2-5 Sheet-through DF block diagram

• Initial operation when turning on the main switch

Timing chart 1-2-1 Initial operation when turning on the main switch

A The scanner motor (SM) reverses to start initial operation.B After the exposure lamp (EL) turns on for 1000 ms, the DF motor (DFM) rotates forward

for 1000 pulses and, 40 ms later, reverses for 800 pulses. The DF forwarding pulley thenrises and stops at its standby position.

EPCB MOTPCB

DFSDPCB

DFTSW

CN12-1–CN12-2

CN2-1–CN2-6

CN13-14 CN1-8CN2-3

DFM

MSW: On

Fwd. rotation

Rev. rotation

Fwd. rotation

Rev. rotation

SM

EL

DFM

SHPSW

40 ms

40 ms

800 P

992 P

1000 P

1000 ms

A B

192

1-2-6

• Original feed operation during copying

Timing chart 1-2-2 Original feed operation during copying

A When the scanner motor (SM) reverses and the scanner stops at the scanning startposition, the DF motor (DFM) rotates forward and the DF forwarding pulley descendsfrom its standby position, forwarding the original.

B 150 pulses after the leading edge of the original turns the DF timing switch (DFTSW) on,the DF motor (DFM) turns off and forwarding of the original is completed.

C The DF motor (DFM) rotates forward again, the original is conveyed onto the DF contactglass by the rotation of the DF forwarding pulley and DF original feed pulley and thescanner scans the original.

D 75 to 395 pulses after the trailing edge of the original turns the DF timing switch (DFTSW)off, the SVSYNC signal turns off.

E 2500 pulses after the SVSYNC signal turns off, the DF motor turns off and the originalfeed operation is completed. 50 ms later, the DF motor (DFM) reverses and the DFforwarding pulley rises and stops at its standby position.

Scan signal

Fwd. rotation

Rev. rotation

Fwd. rotation

Rev. rotation

SM

EL

DFM

SVSYNC

SHPSW

DFTSW

560 – 800 P

106 P

150 P 2500 P

992 P

50 ms

20 ms

120 ms

50 ms

During scan: 200 – 520 pulsesDuring copy: 168 – 488 pulses

A BC D E

75 – 395 P

1-1-7

192

CONTENTS

2-1 Electrical Parts Layout

2-1-1 Electrical parts layout ........................................................................... 2-1-1

192

2-1-1

2-1-1 Electrical parts layout

Figure 2-1-1

1. DF motor (DFM) .................................................. Drives the sheet-through DF. 2. DF safety switch (DFSSW) ................................. Breaks the safety circuit when the

DF cover is opened; resetsoriginal jam detection.

3. DF size detection PCB (DFSDPCB) ................... Detects the presence and size ofpaper on the original table.

4. DF timing switch (DFTSW) ................................. Detects original jam in the sheet-through DF.

Machine front Machine inside Machine rear

1

2

43

1-1-9

192

CONTENTS

2-2 Detection of Paper Misfeed

2-2-1 Original misfeed detection .................................................................. 2-2-12-2-2 Original misfeed detection conditions ................................................. 2-2-2

192

2-2-1

2-2-1 Original misfeed detection

When an original jams, the copier immediately stops copying and displays a message andgraphic on the operation panel.To remove the jammed original, open the DF cover as necessary.To reset the original misfeed detection, open and close the DF cover to turn the DF safetyswitch off and on.

Figure 2-2-1 Original misfeed detection

DFM

DFTSWDFSDPCB

DFSSW

192

2-2-2

2-2-2 Original misfeed detection conditions

• The DF timing switch (DFTSW) is still on after the main switch has been turned on and theinitial operation of the scanner has completed.

• An original jam occurs under any of the following conditions when turning the DF motor(DFM) on after the scanner moves to the scanning start position.- The switch (OD) on the DF size detection PCB (DFSDPCB) is off.- The DF timing switch (DFTSW) is on.- The DF safety switch (DFSSW) is off.- The original detection switch (ODSW) of the copier is off.

• An original jam occurs under any of the following conditions while the DF motor is on andan original is scanned or ejected.- The DF safety switch turns off.- The original detection switch (ODSW) of the copier turns off.

• During continuous copying, the next original has already turned the DF timing switch(DFTSW) on before the previous original is ejected.

• The length of an original is longer than 17" by 50 mm or more.

1-1-11

192

CONTENTS

3-1 Installation

3-1-1 Unpacking and installation .................................................................. 3-1-1

3-1-1

192

1 Copier2 Bottom pads3 Plastic sheet4 Bottom plate5 Bar code labels6 Outer case7 Air-padded bag8 Original table9 Top pad0 Accessory case! Plastic bag

3-1-1 Unpacking and installation

Figure 3-1-1

@ Installation manual# Instruction handbook$ Plastic bag% Two (2) M4 × 6 cross-headed TP-A chrome screws^ Three (3) M4 × 6 cross-headed TP-A bronze screws& One (1) M4 × 8 cross-headed TP tap-tight P bronze

screw* Air-padded bag( Right hinge attachment) Left hinge attachment⁄ DF grounding wire

$

!

)(

*

0

%^

&

⁄

9

1

@#

8

2

7

3

4

6

5

1-1-13

192

CONTENTS

3-2 Assembly and Disassembly

3-2-1 Precautions for assembly and disassembly ......................................... 3-2-1(1) Precaution.................................................................................... 3-2-1

3-2-2 Procedure for assembly and disassembly ........................................... 3-2-2(1) Detaching and refitting the DF forwarding pulley ......................... 3-2-2(2) Detaching and refitting the DF original feed pulley ...................... 3-2-3(3) Detaching and refitting the DF separation pulley ......................... 3-2-4(4) Adjusting the copy center line when the sheet-through

DF is used.................................................................................... 3-2-7(5) Adjusting the scanning start position when the sheet-through

DF is used.................................................................................... 3-2-8(6) Adjusting the scanning end position when the sheet through

DF is used.................................................................................... 3-2-9(7) Adjusting magnification .............................................................. 3-2-10

3-2-1

192

3-2-1 Precautions for assembly and disassembly

(1) Precaution• Be sure to turn the main switch off and disconnect the power plug before startingdisassembly.

3-2-2

192

3-2-2 Procedure for assembly and disassembly

(1) Detaching and refitting the DF forwarding pulleyClean or replace the DF forwarding pulley as follows

Procedure1. Open the DF cover.2. Remove the two screws holding the DF cover and then the cover.3. Remove the E-ring and then the DF forwarding pulley from the forwarding pulley

shaft.4. Clean or replace the DF forwarding pulley.5. Refit all the removed parts.

Figure 3-2-1 Detaching the DF forwarding pulley

DF forwarding pulley

E-ring

Forwarding pulley shaft

3-2-3

192

(2) Detaching and refitting the DF original feed pulleyClean or replace the DF original feed pulley as follows.

Procedure1. Open the DF cover.2. Remove the two screws holding the DF cover and then the cover.3. Remove the screw and DF rear cover (see Figure 3-2-3).4. Remove the two stop rings and the bushing and slide the original feed pulley shaft

toward the machine rear.5. Remove the DF original feed pulley and original feed pulley gear from the original

feed pulley shaft.6. Clean or replace the DF original feed pulley.7. Refit all the removed parts.

• When fitting the DF original feed pulley and original feed pulley gear, ensure that theside having the one-way clutch faces the machine rear.

Figure 3-2-2 Detaching the DF original feed pulley

Stop rings

DF original feed pulley

Original feed pulley gear

Original feed pulley shaft

BushingDF forwarding pulley retainer

3-2-4

192

(3) Detaching and refitting the DF separation pulleyClean or replace the DF separation pulley as follows.

Procedure1. Open the DF cover.2. Remove the two screws holding the DF cover and then the cover.3. Remove the screw holding the DF rear cover and then the cover.4. Remove the DF connector.5. Detach the cable tie holding the DF wires from the base.6. Remove the four screws holding the DF original feed unit and then the unit.

• When installing the DF original feed unit, ensure that the mark at the center of thescale is aligned with the center of the projection on the front side of the copier.

Figure 3-2-3

DF rear cover

DF connector

DF original feed unit

3-2-5

192

Figure 3-2-4

7. Remove the stop ring and then the housing coupling.8. Remove the front and rear pins and then the DF upper housing.9. Remove the two screws and then the DF original feed guide.

PinDF lower housing

Pin

DF original feed guide

Stop ring

Housing couplingDF upper housing

3-2-6

192

10. Remove the two stop rings and bushings from the front and rear of the separationpulley shaft.

11. Remove the E-ring and pin and detach the DF separation pulley from the shaft.12. Clean or replace the DF separation pulley.13. Refit all the removed parts.

Figure 3-2-5 Detaching the DF separation pulley.

Stop ring

Separation pulley springs

Bushing

Pin Separation pulley shaft DF separation

pulley

E-ring

Bushing

Stop ring

3-2-7

192-1

(4) Adjusting the copy center line when the sheet-through DF is usedPerform the following adjustment if there is a regular error between the centers of theoriginal and copy image when the sheet-through DF is used.

Important: When performing this adjustment, all the above maintenance items must beexecuted in the order indicated.Use an original with a line drawn down the center.

Procedure

No. 120 No. 127

Enter maintenance mode.

Enter 400 with the numeric keys and press the start key.

Place an original on the DF original table.


Yes

No

Start

End

Press the all clear/reset key.

Exit maintenance mode.

Press the start key to make a test copy.

Is the image correct? Press the numeric keys to change the setting.• For copy example 1, increase

the value.• For copy example 2, decrease

the value.

Press the start key.




The new setting is stored.

Setting range: 0 – 20Reference: 10Change per step: 0.5 mmIncreasing the value moves the copy image toward the machine rear, and decreasing the value moves it toward the machine front.

Original Copyexample 1

Copyexample 2

Center line

Figure 3-2-6

3-2-8

192-1

(5) Adjusting the scanning start position when the sheet-through DF is usedPerform the following adjustment if there is a regular error between the leading edges ofthe original and the copy image when the sheet-through DF is used.

Important: When performing this adjustment, all the above maintenance items must beexecuted in the order indicated.Use an original with a line drawn horizontally at a point 10 mm from theleading edge.

Procedure

No. 110 No. 107(p. 3-2-10)

No. 112





Yes

No

Start

End




Is the image correct? Press the numeric keys to change the setting.• For copy example 1, increase

the value.• For copy example 2, decrease

the value.






Setting range: 0 – 40Reference: 20Change per step: 0.5 mmIncreasing the value makes the scanning start later, and decreasing the value makes it start earlier.

Figure 3-2-7


Copyexample 2

Horizontal line

10 mm

3-2-9

192-1

(6) Adjusting the scanning end position when the sheet through DF is usedPerform the following adjustment if there is a regular error between the trailing edges ofthe original and copy image when the sheet-through DF is used.

Important: When performing this adjustment, all the above maintenance items must beexecuted in the order indicated.

Procedure

No. 110 No. 115 No. 107(p. 3-2-10)

No. 117





Yes

No

Start

End




Is the image correct?






Setting range: 0 – 40Reference: 20Change per step: 0.5 mmIncreasing the value makes the scanning end later, and decreasing the value makes it end earlier.

Press the numeric keys to change the setting.• For copy example 1, decrease

the value.• For copy example 2, increase

the value.

Figure 3-2-8


Copyexample 2

3-2-10

192-1

(7) Adjusting magnificationPerform the following adjustment if magnification is not correct when the sheet-throughDF is used.

Procedure




Yes

No

Start

End




Is the image correct?

Press the numeric keys to change the setting.






Setting range: 0 – 60Reference: 30Change per step: 0.1%Increasing the value makes the copy image longer/wider, and decreasing the value makes it shorter/narrower.

Enter a function No. with the numeric keys and press the start key: 105 for the main direction and 107 for the auxiliary direction.

Main scanning direction

Auxiliary scanning direction

Figure 3-2-9

1-1-15

192

CONTENTS

3-3 Troubleshooting

3-3-1 Image formation problems .................................................................. 3-3-1(1) There is a regular error between the centers of the original

and copy image when using the sheet-through DF. ................... 3-3-2(2) There is a regular error between the leading edges of the

original and copy image when using the sheet-through DF. ....... 3-3-23-3-2 Original misfeeds ................................................................................ 3-3-3

(1) An original jams in the DF simultaneously when scannerinitialization ends. ....................................................................... 3-3-3

(2) An original jams frequently. ........................................................ 3-3-33-3-3 Electrical problems .............................................................................. 3-3-4

(1) The DF motor does not operate. ................................................ 3-3-4(2) A message requesting the ADF cover be closed is displayed

with the cover closed correctly. ................................................... 3-3-4(3) A message indicating an original jam is displayed when the main

switch is turned on. ..................................................................... 3-3-4(4) Original size is not detected correctly. ........................................ 3-3-4

3-3-4 Mechanical problems .......................................................................... 3-3-5(1) No original feed........................................................................... 3-3-5(2) An original jams. ......................................................................... 3-3-5

3-3-1

192

(1) There is a regular er-ror between thecenters of the originaland copy image whenusing the sheet-through DF.

See page 3-3-2.

(2) There is a regular er-ror between the lead-ing edges of the origi-nal and copy imagewhen using the sheet-through DF.

See page 3-3-2.

3-3-1 Image formation problems

3-3-2

192

(1) There is a regular errorbetween the centers ofthe original and copyimage when using thesheet-through DF.

Causes1. Misadjusted DF center line.

(2) There is a regular errorbetween the leadingedges of the originaland copy image whenusing the sheet-throughDF.

Causes1. Misadjusted scanning start position of the DF

original.

Causes Check procedures/corrective measures

1. Misadjusted DF center line.

Causes Check procedures/corrective measures

1. Misadjusted scanning startposition of the DF original.

Readjust the scanning start position of the DForiginal (see page 3-2-8).

Readjust the DF center line when using thesheet-through DF (see page 3-2-7).

3-3-3

192

3-3-2 Original misfeeds

Check visually and remove it, ifany.

With 5 V DC present atCN13-17 on the engine PCB ofthe copier, check if CN13-14remains low when the DF tim-ing switch is turned on and off.If it does, replace the DF timingswitch.

Use an original conforming tothe specifications.

Check and clean them with iso-propyl alcohol if they are dirty.

Remedy.

(1)An originaljams in theDF simultane-ously whenscanner ini-tializationends.

(2)An originaljams fre-quently.

A piece of paper torn from anoriginal is caught around the DFtiming switch.

Defective DF timing switch.

An original outside the specifi-cations is used.

The DF forwarding pulley, DForiginal feed pulley or DF sepa-ration pulley is dirty with paperpowder.

The DF conveying roller and DFconveying pulley, or the DFeject roller and DF eject pulleydo not contact each other.

Problem Causes/check procedures Corrective measures

3-3-4

192

Broken DF motorcoil.

The connectorterminals of the DFmotor make poorcontact.

The connectorterminals of the DFsafety switch makepoor contact.

Defective DFsafety switch.

A piece of papertorn from an origi-nal is caughtaround the DFtiming switch.

Defective DF tim-ing switch.

Defective connec-tor terminals of theDF size detectionPCB.

Defective DF sizedetection PCB.

3-3-3 Electrical problems

(1)The DF motordoes not op-erate.

(2)A messagerequesting theADF cover beclosed is dis-played withthe coverclosed cor-rectly.

(3)A messageindicating anoriginal jam isdisplayedwhen themain switch isturned on.

(4)Original sizeis not de-tected cor-rectly.

Check for continuity across the coils. If none,replace the DF motor.

Check for continuity across the connectorterminals of the DF motor. If none, replacethe connector terminals.

Check for continuity across the connectorterminals. If none, replace the connectorterminals.

Check for continuity across the contacts ofthe switch. If none when the switch is on,replace the switch.

Check visually and remove it, if any.

With 5 V DC present at CN13-17 on the en-gine PCB of the copier, check if CN13-14remains low when the DF timing switch isturned on and off. If it does, replace the DFtiming switch.

Check for continuity across the connectorterminals. If none, replace the terminals.

Check if each of CN13-10 to 13 on the en-gine PCB of the copier changes when eachof four size detection sensors on the DF sizedetection PCB is turned on and off. If any ofthem does not, replace the DF size detectionPCB.

Problem Causes Check procedures/corrective measures

3-3-5

192

3-3-4 Mechanical problems

Clean with isopropyl alcohol ifthey are dirty.

Use an original conforming tothe specifications.

Clean with isopropyl alcohol ifthey are dirty.

Remedy.

(1)No originalfeed.

(2)An originaljams.

The surfaces of the DF forward-ing pulley or DF separation pul-ley are dirty with paper powder.

An original outside the specifi-cations is used.

The surfaces of the DF forward-ing pulley, DF original feed pul-ley or DF separation pulley aredirty with paper powder.

The DF conveying roller and DFconveying pulley, or the DFeject roller and DF eject pulleydo not contact each other.

Problem Causes/check procedures Corrective measures

1-1-17

192

CONTENTS

3-4 Appendixes

Timing chart No. 1 ......................................................................................... 3-4-1Timing chart No. 2 ......................................................................................... 3-4-2DF size detection PCB .................................................................................. 3-4-3

192

3-4-1

Tim

ing

char

t No.

1In

itial

ope

ratio

n of

the

DF

and

sca

nner

MS

W: O

N

Fw

d. r

otat

ion

Rev

. rot

atio

n

Fw

d. r

otat

ion

Rev

. rot

atio

n

CN

12-7

–C

N12

-12

CN

14-1

–C

N14

-2

CN

12-7

–C

N12

-12

CN

13-7

40 m

s

40 m

s

800

P

992

P

1000

P

1000

ms

SM

DF

M

EL

SH

PS

W

192

3-4-2

Tim

ing

char

t No.

2S

cann

ing

oper

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n

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ion

Rev

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Rev

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CN

12-7

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CN

14-1

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N14

-2

DF

MC

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-7–

CN

12-1

2

SV

SY

NC

SH

PS

WC

N13

-7

DF

TS

WC

N13

-14

560

–80

0 P

58 –

154

P

150

P25

00 P

992

P

50 m

s

75 –

395

P

20 m

s 120

ms

50 m

s

Dur

ing

scan

: 200

- 5

20 p

ulse

sD

urin

g co

py: 1

68 -

488

pul

ses

AA A

A

AA A

A

E

E E

E

E

E E

E

EA

EA

A B C D E F G H I J

A B C D E F G H I J

1

2

3

4

5

6

7

8

1

2

3

4

5

6

7

8

192

3-4-3

STDF-2 (MCA/MCE) S/M

DF size detection PCB

CN2-25 V DC

SG

DFTSW

DFSSW

DFSSW

SG

DFTSW

SG

DFSSW

5 V DC

DF SIZE1

DF SIZE2

DF SIZE3

DF SIZE4

DFOD

CN1-1

CN1-2

CN1-3

CN1-4

CN1-5

CN1-6

CN1-7

CN1-8

CN1-9

CN1-10

CN2-1

CN2-3

CN3-1

CN3-2

©1998 MITA INDUSTRIAL CO., LTD.MITA and are registered trademarks of MITA INDUSTRIAL CO., LTD.

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