NP6020

SERVICE MANUAL (for'2201240V)

REVISION 0 MAY 1993

I Canon FY8-13CT-000

COPYFtIGHT 1993 CANON INC. CANON NP6020 REV.0 MAY 1993 PRINTED IN JAPAN

1. GENERAL DESCRIPTION -

---\/ I. FEATURES 1. Front-loading.

- The copier is designed to accept cassettes from the front for ease of use (two cassettes holding 250 sheets each).

l The copier is given two cassette holders, thereby eliminating the need for cassette replacement in making copies of different sizes.

* The copiers multifeeder allows Jeeding multiple postcards.

2. Full line of automatic features - The copier has an auto paper selection mechanism as standard, which selects paper of

the correct size in response to placement of a document. - With the auto reproduction ratio selection mechanism, the copier calculates the correct

reproduction ratio according to the specified copy size. * The AE (auto exposure) mechanism ensures crisp reproduction of newspapers and blue-

print documents.

I\ - The copiers auto-start feature lets you press the COPY START key during the wait period : so that the copier will start making copies as soon as it becomes ready.

3. HQ jumping toner. - The copier uses Canons own HQ (high quality) jumping toner for reproduction of clear

characters and photos. l The toner is a single-component type, which provides stable images. l In addition, a 30mm-dia. high sensitivity OPC drum is used to enable enhanced image

reproduction and a compact copier design.

4. Man-machine interface. l As many as 20 copies (A4, landscape) may be made per minute. - The zoom mechanism allows reduction down to 50% and enlarqement up to 200% of the

original image. - The page separation mode serves to speed up copying bound documents. - The copier accepts documents as small as a postcard or as large as A3. * With the CT Unit (option), the copies may be in red, green, blue, or brown

- I 1

5. A variety of options to choose from for full automation. The copier commun/cates with its options at a higher speed than ever, resulting in more output per given time.

* With options, up to 20 copies/min; 1:1 (A4, landscape).

* ADF-Al for automatic document feed. - Sorter-Al for automatic sorting and grouping (20 bins) l MS-Al for automatic sorting aid grouping (70 bins). * Control Card V (configured as built-in) for copy volume control (up to 200 groups). l Stapler Sorter-BNIl for stapling copies sorted in its ten bins.

- 1. GENERAL DESCRlPTlON

II. SPECIFICATIONS A. Type

Body Desk top

Copyboard Fixed

Light source Halogen lamp (330 W)

Lens Zoom lens

Photosensitive medium OPC

6. Construction

Copying

Charging

Exposure

Copy density adjustment

Development

Pick-up Automatic

Manual

Transfer

Separation

Cleaning

Fixing

Indirect static photocopying

Corona

Slit (moving light source)

Automatic (AE) or Manual

Dry (toner projection)

2 cassettes

Multifeed (about 50 sheets of 80g/m2)

Corona

Curvature and Static eliminator

Blade

Heat roller (950 W)

1. GENERAL DESdRlPTlON -

C. Performance

Document type Sheet, Book, 3-D object (2 kg)

Document size (max.) A3 (297x420 mm)

Reproduction ratio See Table l-l ; 50% to 200%, zoom.

Wait time 90 set or less (20C)

First copy 8 set or less

Continuous copying 1 to 99 copies

Copy size A3 (297 x 431.8 mm) max. Postcard (100 x 148 mm) min.

COPY paper Cassette Plain paper (64 to 80 g/m), Tracing paper*, Colored paper*

Multi feed tray Plain paper (64 to 128 g/me), Tracing paper Colored paper*, OHP film*, Postcard, Label

Tow-sided Plain paper (64 to 128 gim2), Colored paper*, Overlay copy Postcard

Cassette Claws, Front loading: 27 mm deep (about 250 sheets of 80 g/m*)

Copy tray 99 sheets (80 g/m*)

Non-image width 2.0 +1.5 mm (leading edge), 2.5 +1.5 mm (left/right)

Auto clear mechanism Provided. (2 min. standard)

Auto shut-off mechanism Provided. (2 hours, standard; may be disabled)

Auto start Provided.

Option Sorter-Al, MS-Al, Paper Deck Pedestal-J1 , Control Card V, CT Unit, Stapler Sorter-D1 Stapler Sorter-62

* Of a type recommended by Canon.

D. Others

(Sound power level as prescribed by ISO)

Consumables

Keep in box or pedestal; avoid direct sun, and keep it under 30% 85%

I

I, GENERAL DESCRIPTION -

Reproduction mode Paper size Cassette Copies/min

A3 (297x420mm) A3 11

A4 (21Ox297mm) A4 20

I A4R (297x210mm) I A4R I 15 DIRECT

84 (257x365mm) (84) 12

85 (1 e2x257mm) (85) 21

A5R (21Ox149mm) I A5R I 20

I 50% REDUCE

II A3 + A4R A4R 13

I A4R --3 A3 A3 11 ENLARGE

II 200%

Table l-1

~pecificafions are subjecf lo change without notice.

A. External View

-1. GENERAL DESCRIPTION

III. NAMES OF PARTS

@ Control panel @ Power switch @ Upper cassette @ Lower cassette @ Front door @ Delivery cover

Figure l-1

@ Copyboard glass @ Multifeeder cover @ Multifeeder tray @! Developing assembly release lever

Feeder assembly release lever

@ Fixing assembly knob

Figure l-2

,-- j\

I

,

I ,, .=,

1. GENERAL DESCRIPTION -

B. Cross-Sectional View

@ No. 3 mirror @ No. 2 mirror @ No. 1 mirror @ Scanning lamp @ Copyboard glass @ Copyboard cover 0 Lens @ Pre-exposure lamp @ Primary corona unit @ No. 6 mirror

0

Q Q 0 63 63 @

Figure 1-3

No. 5 mirror No. 4 mirror Registration roller Multifeeder tray Vertical feed roller 1 Vertical feed roller 2 Cassette 1 pick-up roller Cessette 2 pick-up roller Feeder roller Transfer corona unit

@ Static eliminator @ Photosensitive drum @ Cassette 1 Q Cassette 2 @ Feeder unit @ Ozone filter @ Exhaust fan @ Fixing unit @ Delivery roller

CANON NPS020 REV0 MAY 1993PRNTED NJWNN(IMFRMEW JUUN) I-7

- 1. GENERAL DESCRIPTION

IKOPERATION A. Control Panel

Figure l-4

SORT/GROUP/STAPLE SORT key Press it to select the sort group, staple sort or non-sort mode. The indicator remains unlit when the non-sort mode is selected. * sorting

z- grouping 0 staplesorting

PAGE OPERATlON key Press it to seled the page separation mode. JAM indicator CONTROL CARD indcator ADD PAPER indicator ADD TONER in&&r COPY COUNT/RATIO indiitor It indiites the reproc+Jdon ratio when the % key is pressed. COPY START key - glows orange when the copier is not ready

for copying. - gk3ws green when the copier is ready for

copying. RESET key Press it to reset the copier to its default settings. Default Settings * copy count 1 - DIRECT - AE (may be turned OFF using C15 of

service mode) CLEARSTOP key STANDBY key POWER switch

POWER indicator The indicator remains ON while the power is on. Numeric keypad % key Press it to check the reproduction ratio on the copy count indicator. The display changes to the copy count 2 set after the key is released. ZOOM key Press it to select a desired reproduction ratio between 50% and 200% in 1% increments. AUTO RATIO key Press it to select or deselect the auto reproduction ratio mode. The key is effective when the ADF is attached. PAPER SELECT/JAM indicator ,A LED goes ON to indicate the locatin of the paper or flashes to indicate the location of the jam, if any. PAPER SELECT key Press it to select automatic paper selection (may be turned OFF using CO7 of service mode) or cassette or multifeeder as the source of paper. ENLARGE key DIRECT key REDUCE key

-. AE (automatic exposure; density adjusbnent) key COPY DENSITY lever

B. *-j 1)

2)

5)

,,=7, j/

3)

Basic Copying Operation Set the power switch to ON.

If the temperature of the fixing roller is too low for copying, the indicator of the COPY START key will blink green. When the temperature of the fixing roller becomes high enough for copying, the indicator will glow green. The normal *waiting time at room temperature (20C) is about 90 seconds.

Raise the copyboard cover, place an original on the copvboard with the side to be copied facing down, and align it with the size index. To adjust the copy density manually, the AE key indicator should be OFF; press the key once if it is ON. Set the COPY DENSITY lever to suit the original. Check the size of paper in the cassette. a) If the cassette does not have the

desired size of paper, remove it and install a cassette with the desired size.

Set the required number of copies (1 to 99) using the NUMERIC keypad and confirm that the correct number appears on the COPY COUNT/RATIO indicator. a) If an error was made in inputting

the number of copies, press the CLEAR/STOP kev and reset the number of copies. _

Press the COPY START key. To stop a continuous copying operation, press the CLEAWSTOP key or RESET key. The copier will complete the copy in progress, then stop. The COPY COUNT/RATIO indicator will display the initial copy quantity. It is possible to switch from automatic exposure control to manual density adjustment at any time from the start of copying to the completion of the final copy. However, it is not possible to switch from manual density adjustment to automatic.

C.

:;

:; 5)

6)

87;

9)

19)

11)

If the copy is too dark or too faint using AE, cancel AE and vary the copy density with the COPY DENSITY lever.

If the ADD PAPER indicator goes ON during copying, the copier will stop. Refill the cassette and press the COPY START key. The remaining number of copies will be made automatically. If the copier has an ADF, place a document (original) on the document tray. The document will be fed automatically and copying will start. If no other operation is performed, the copier will return to the standard mode approximately 2 min after it completes a copy or after the last key operation. The copier shuts itself off auto- matically 2 hours after power-on (auto shut-off function; may be turned off using CO8 of service mode).

Pick-Up from Multifeeder Set documents on the copyboard. Press the PAPER SELECT kev to select the multifeeder. Open the multifeeder tray. Open the multifeeder cover. Set the slide guide to the size of the copy paper. Set copy paper.

0 As may as 50 sheets (80 g/mz) may be set.

Close the multifeeder cover. Set the desired reproduction ratio using the DIRECT, REDUCE, ENLARGE, or ZOOM key. Cancel the AE mode, and set the COPY DENSITY lever if manual adjustment of the density is desired. Enter the number of copies using the numeric keypad. Press the COPY START key.

Example:

l-9

D. Two-Sided Copying Copy one side of a 2-sided original.

Turnover the original so that the same edge faces the front. Turnover the copy in the same way (from edge facing the front) and feed it into the copier.

a) Use dry, uncurled paper. b) Use paper in the weight range 60

to 128 glmz. c) When making two-sided copies,

only one image can be made on each side of the copy paper.

d) Both overlay and two-sided copies cannot be made on the same sheet of copy paper.

Figure l-5

E. Overlay Copy Operation By changing the developing assembly,

a P-color copy can be made on the same side of the copy paper.

Use paper in the range of 64 to 128 glm2. When making an overlay copy, a maximum of two images can be made on one side of the copy paper. Overlay and two-sided copies cannot be made on the same sheet of copy paper.

F. Auto Start The auto start mechanism may be

made use of while the copier isin the wait mode (COPY START key blinking green); i.e., after it is switched ON or after the standby mode is canceled.

Set a document while the copier is in the wait mode, and select the copy modes; then, press the COPY START key.

The COPY START key changes from

blinking green to orange to indicate that the auto start mechanism has been activated. ,-

The copier starts making copies as soon as it enters the standby mode using \__ the selected copy modes,

The auto start mechanism may be canceled by pressing the CLEAR/STOP or RESET key.

G. Auto Shut-off If the copier is not used for two hours,

the power will turn OFF automatically. (The Standby key will flash orange.)

To turn the power back ON, press the Standby key.

H. Replacing the CT Unit 1) Open the front door. 2) Swing the developing assembly release .__

lever counterclockwise. 3) Pull the developing assembly forward. 4) Grasp the handle of the developing

assembly, and raise it carefully.

Figure l-6

5) Place the CT carefully on the devel- oping assembly guide rails and push it in the copier.

6) Shift the developing assembly release lever clockwise until it is horizontal.

7) Close the front door.

1 i. ,Do nbt~tilt~or.handle the developing i as&mbly prthe CT unit roughly. : ii. Dpnot .plaq the develapinng assembly

dr the,,CTunit onthe floor.: Be sure to 1 .:place,them ,in,their~storage.box or on, ,.

,---

1) the pedestal~of,the.cqpier, _ _) _ :*^^,3 ,, I.__

1. GENERAL DESCRIPTION -

V. WARNING INDICATOR AND REQUIRED ACTION

A. Jam Indicatorh

If an area of this indicator flashes while copying is taking place, it is likely that the paper has jammed at the position repre- sented by the part that is flashing. Check and take action as follows.

Sorter JAM indicator

Feeding unit indicator

Figure 1-7

When clearing a paper jam which has occurred in an option unit (sorter or ADF), refer to the SERVICE MANUAL for the option unit. l Multifeeder indicator * ADF unit document JAM indicator - Copier paper JAM indicator l Right door OPEN indicator l Feeding unit indicator - Sorter JAM indicator

If paper jams inside the copier, check the paper pick-up area, separation feeder area, fixing/copy delivery area, and cartridge area; and remove all jammed paper. 1) Open the front door. 2) Remove the copies from the copy tray. 3) Operate the release and open the copy

delivery assembly. 4) Check if there is copy paper jammed in

the fixing assembly. If there is paper jam in it, turn the knob of the fixing rollers counterclockwise to remove the jammed paper.

Figure 1-8

Close the copy delivery assembly. Check if there is paper jammed in the separation/feeder area. If there is, swing the feeder release lever counter-, clockwise to open the feeder, then remove the jammed paper. Be careful not to tear the paper.

Note-: ,I,:- ., , ; :I^ , ((1; ;,;,;

When removing jammed paper from the1 : separation area,. be very careful not,$ touch the photbsehsitivedrum.~ :( (. S_ ,I,/ ;

Figure 1-9

7) Open the multifeeder cover, and remove the paper from the multifeeder tray.

8) Hold the grip found at the bottom of the multifeeder cover, and open the right door; then, remove the jam.

Figure l-10

9) Close the right door.

Figure l-11

-10) Close the front door.

B. Add Paper Indicator& ,

1. Cassette The indicator goes ON when no \

cassette is found in the cassette holder or no paper is found inside the cassette. 1) Push the center of the cassette.

- The cassette springs out automati- cally.

,_--

Figure l-l 2

2) Set copy paper inside the cassette. * As many as 250 sheets of copy

paper (80 g/m*) may be set.

Figure I-13

3) Hold the center of the cassette, and slide it into the cassette holder until it stops.

2. ~Multifeeder The indicator goes ON when the paper

on the multifeeder tray is not positioned correctly or the multifeeder cover is left open.

. As many as 50 sheets of copy paper (80 iglmz) may be set on the multi- feeder tray.

1-12

C. Add Toner Indicator& This indicator flashes when the amount

of toner in the black developing assembly has become low.

1.

:;

3)

4)

5)

3)

7)

8)

2, ii)

12)

13)

Black developing assembly Open the front door. Turn the developing assembly release lever counterclockwise. Pull the developing assembly forward as far as possible. Open the top cover of the developing assembly. Shake the toner cartridge back and forth about 10 times. Place the toner cartridge on the developing assembly. While holding the toner cartridge in place, remove the seal slowly to allow the toner to flow out.

Figure l-14

Tap the top of the toner cartridge to remove any toner remaining in the cartridge. Carefully remove the toner cartridge. Close the top cover of the developing assembly. Put the developing assembly back into the copier. Swing the developing assembly release lever clockwise. Close the front door.

2. CT Unit (color developing unit) If copy images become faint, the color ~

toner has probably run out. In this case, replace the CT Unit. The copy image can sometimes be temporarily restored by agitating the CT Unit in its storage box.

The CT : unit is a &sjras&fe type. Wheh i the color toner has be&n used up, toner ii.: not a&fad to the dT.Unit; rather, the entfr& unit is replaced: ;, , _, ^, ,( _I,, ;I I ibi i

D. Control Card Indicator IEB The control card indicator operates on

a copier with a control card unit. It flashes in the following cases:

4

b)

When-there is no control card in the control card unit. When there is a control card in the control card unit but the indication on the control card unit is P or EE.

I 1. GENERAL DESCRIPTION

VI. DAILY INSPECTION TO BE PERFORMED BY THE CUSTOMER

Carefully instruct the customer to be sure to clean the following parts of the copier once a week. 1. Primary Corona Assembly

Slide in and out the wire cleaner to clean the corona wires.

2. Copyboard Glass Clean the copyboard glass with a moist cloth, then wipe it dry.

3. Copyboard Cover Clean the copyboard cover with a mild detergent solution, then wipe it dry.

4. Transfer Corona Assembly Remove the transfer corona assembly from the copier, then slide the knob (wire cleaner) at the bottom of the transfer corona assembly back and forth to clean the corona wires. Further, clean the static eliminator using the cleaning brush (accessory).

2. COPYING PROCESS -

,,_~, I. IMAGE FORMATION (/ PROCESS

A. Outline

$,_- - _+-.+

Primary corona assembly _ Developing .r>

Figure 2-1

- 2 COPYING PROCESS

Electrostatic latent image formation block ~------__-_-- ------ --7

2. Primary corona

+ Direction of rotation of drum /_. \

Figure 2-2

This copier consists of the units shown Step 3: Image exposure in Figure 2-l. Step 4: Developing (positive plus AC)

The image forming process is divided Step 5: Transfer (negative DC) into the right steps shown below. Step 6: Separation Step 1: Preexposure Step 7: Fixing Step 2: Primary corona (negative DC) Step 8: Drum cleaning

,-..\

2. COPYING PROCESS 0

The outer surface of the photosensitive drum is a layer of organic photoconductor (OPC). The base is an aluminum (conduc- tive) cylinder.

Photoconductive layer

Base

Figure 2-3

B. Electrostatic Latent Image ~ Formation Block

i i/.-- \ This stage consists of three steps. At the end of the stage, the drum has a pattern of negative electrical charges on its surface corresponding to the dark parts of the document image. The light areas of the document image are represented on the drum by the absence of charges.

The pattern of negative charges cannot be seen by the eye, hence it is called an electrostatic latent image.

Of- Time (1) -

Dark area

Figure 2-4

C. Step 1 Pre-Exposure

Figure 2-5

Before the primary corona step, light from the pre-exposure lamp is shone onto the surface of the drum (pre-exposure). This process eliminates residual charges and helps to make the density of the copy even.

D. Step 2 Primary Corona

Primary corona assembly

Figure 2-6

The primary corona (negative) applies a uniform layer of negative charges over the drum surface.

The drum surface potential is deter- mined bv the arid ootential. The grid is connected to ground through which holds the drum potential the varistor break-down voltage.

a varistor,, constant at

- 2. COPYING PROCESS

E. Step 3 Scanning Exposure

Optical image

Figure 2-7

Light from the original is projected onto the drum surface. Charges in these light areas on the drum are neutralized by drum photosensitive effects.

F. Step 4 Developing

} $$JpQ

Figure 2-8

As shown in Figure 2-8, the developing assembly consists of a developing cylinder (a stationary magnet surrounded by a rotating sleeve) and a blade made of magnetic material. Black toner is a single component type consisting of a fine powder of mixed magnetite and resin binder. The toner has insulating properties and is charged to a positive potential by friction with the rotating cylinder.

Color developer is a two-component type consisting of iron powder (carrier) and

toner mixed together in a fixed ratio. The main component of the toner is resin. The /--- toner is charged to a positive potential and , the iron powder to a negative potential by friction with the rotating cylinder.

Figure 2-9

A concentrated magnetic field develops between the magnet and the edge of the _ blade. This field attracts the charged developer.

The developer is held virtually immobile by the magnetic field, forming a curtain along the edge of the blade. As the cylinder rotates, this curtain skims the toner particles on its surface to a thin uniform layer.

An AC bias plus a negative DC bias are applied simultaneously to the developing cylinder so that the waveform of the developing bias has a larger negative excursion than positive.

.q++fjyg

DC bias

Figure 2~10

During copying toner is attracted to the drum by the charges on the drum surface and by repulsion due to the developing bias (during the positive excursion), transforming the latent electrostatic image into a visible image. Excess toner particles are attracted back to the cylinder from the drum due to the charges on the drum surface and the developing bias (during the negative excursion).

The DC bias affects copy density and _ fogging: As the DC bias becomes less negative (approaching OV), the density and _ degree of fogging both increase.

2. COPYING PROCESS -

( G. Step 5 Transfer ,?

H. Step 6 Separation

Transfer coroa g \ 4

Static charge eliminator

i -\ Figure 2-l 1 Figure 2-12

In this step, a negative corona is The copy paper is separated from the applied to the back of the copy paper, drum by utilizing its stiffness. Thin paper, attracting the toner from the surface of the however, is not stiff, and may wrap around drum to the copy paper. the drum instead of separating from it. To

prevent this, a positive voltage is appliedto the separation static charge eliminator, weakening the attraction between the drum and the copy paper. This enables the paper to separate easily from the drum.

- 2. COPYING PROCESS

I. Step 7 Fixing II. AUXILIARY _ Oil application roller

%I

PROCESSES [ A. Blank Exposure

& Upper iixing roller Blank exposure is the process of

Tungsten-halogen shining light onto the drum and is simply the

heater (950W) removal of the drum surface potential in the

1 non-image areas resulting from REDUCTION cbpying and using some

Lower fixing roller \

TClWJr cassette sizes (paper sizes). The light for

+ this is produced by the preconditioning lamp and is reflected onto the drum by a reflector.

WY paper In the non-image area on the drum

between successive sheets of copy paper,

Figure 2-13 the grid bias of the primary corona is reduced to orevent adhesion of toner. For

In this step, the copy paper is pressed these areas, there is no blank exposure for removal of the surface charges. /- /

between two heated rollers to make the _ toner image permanent.

To prevent the copy paper from B. Ozone Filter wrapping around the roller and toner offsetting (adhesion of toner to the roller and transfer of the toner to the next copy), the surface of the upper fixing roller is cleaned with the cleaning roller.

A catalytic ozone filter in the exhaust fan prevents ozone (generated by the coronas) from escaping to the atmosphere by converting the ozone to oxygen.

J. Step 8 Drum Cleaning

Cleaning blade

Toner catcher

Figure 2-14

This step prepares the drum surface for the next copying operation. Any residual toner scraped off the drum by the cleaning blade and picked up by the toner catcher. It is then pushed to the back by the paddle.

\ 1 ,

-..

~ 3. OPERATIONS AND TlMfNG -

~ I. BASIC OPERATION --\ A. Functions

I

The copier can ,be divided into four functional sections: paper pick-up and feed system, exposure system, image formation system, and control system.

___ _ _ -_{ ]T5a~e7GKa~ti-i s ysim system I I

1 Primary coronaA j

/? \

Cassette 1

I I I I I

cassene 2 I

Figure 3-l

B. Outline of Electric Circuitry

1. . . . . .

. 2.

.

3.

The NP6020s main mechanisms are controlled by the microprocessor, PROM, and EEPROM on the DC controller PCB.

Microprocessor (Q303: master) controls the copying sequence controls the control panel controls the main motor/scanner motor controls the scanning lamp controls the serial communication with the ADF reads analog signals PROM ((2318) contains seauence oroorams EEPROM (d315) stores data that can be modified in the service mode (replaces conventional variable resistors and switches)

-3. OPERATIONS AND TIMING

-.

Microprocessor ((2305: slave) controls the document size identifica- tion controls the serial communication with the sorter controls the fans and the oil application solenoid controls the paper deck pedestal

I

-\ 1 (Sensor)

I 3. OPERATIONS AND TlhUNG -

(Control panel)

r _-__--- DC controller PCB I

Scanner home position

sensor

Lens home position

sensor

Cassette paper sensor

Delivery paper sensor

Pre-registration paper

sensor

Multifeeder paper sensor

AE sensor

Black toner level sensor

Control panel

Thermistor 1 Microprocessor (Q305 : slave)

(Loads) I

Scanner motor

J Lamp regulator Scanning larrp

r-- --l----

I 1 1

I

I I

I I_ Microprocessor I I

Sorter controller PCB

I I - I

I Deck controller PCB

I

Sensors. Switches

I

\_ { Microprocessor

ADF controller PCB

Figure 3-2

-3. OPERATIONS AND TIMING

C. Inputs to DC Controller 1. Inputs to DC Controller (l/3)

7.

DC controller PCB

Pm-registration

paper Sensor

Scanner home

position sensor

Lens home position

sensor

Delhy paper sensor

cassette 1 paper sensor

a2 5v

J23-1 J312-3 f

-2 -2 POP1 -3 -1

Control panel

a

when papet is we, Qi ,I.

(light-blocking plate is at (31)

when paper is over Q2,l.

(light-blocking plate is at Q2)

when scanner is at home position.l.

(light-blocking plate is at 03) --

when lens is at home positlon.l

(light-blocking plate is at 04)

when pap&is over Cl5,o.

(light-blocking plale is not at Q5)

when paper IS in upper casselte,l.

(light-blocking plate is at 06)

when paper is inlower cassette,l.

(lighl-blocking plate is at Cl7)

I_-_-____

3. OPERATIONS AND TIMING- ~

2. Inputs to DC Controller (213)

DC controller PCS I

AE I 24V

AE sensor

Black toner level sensor

Thermistor

Cassette 1 size sensor

cassette 2 size sensor

Right door switch

TSI I 5v

I THl(NTC1) I

I ,._.. 1 J41-1 J318-2

I I

Ttil -2 -1

CSTl(SW1) ._______-

!rO\o I J28-3 J311-2 I ucszo I -4 -3

UCSZl I I -5 I-0 -4 ucszz I I -6 -5 I-o UCSZB , I I -2 -1 I oscillation ,__-e---J signal

CSTZ(SW2) r________ J32-3 J311-7 I 1 1-o LCSZO I I 4 -8 I-0 LCSZl I I -5 -9 I-0 LCSZZ I I -6 -10 I-o LCSZ3 I I 1 -2 -6 I . _ oscillation ,_____--J signal

when black toner in black developing assembly is below specific level,0.

when color developing assembly is set,l.

The voltage lowers as the fixing heater temperature rises.

Reads the cassetre size; see p.3.36

when right door IS closed, 0.

~ - 3. OPERATION6 AND TIMING

3. Inputs to DC controller (313)

DC controller PCS

Copyboard CM.W swath,

when copyboard cover is moved

down to about 20 deg., 0.

(starts 1st docomenl identification)

when copyboard cover is moved

down to about 5 deg., 0.

(starts 2nd document identification:

about lsec thereafter)

Document size

identiiication 0

J38-1 J305-7 24V

-10 24V

-2 -8 I - DSLDO

(output)

when o, LED goes ON; when

document is present, 0.

(output)

when 0, LED goes ON; when

document is present, 0.

APS 1

Figure 3-5

1 I 3. OPERATIONS AND TIMING-

..-\, ~

I ___._.\~

D. DC Controller Outputs 1. DC Controller Outputs (l/3)

DC controlier PC6 -___-___

DSW(SW2) SW1

MMD when l, main motor ON

-4. KD when 1.

Fixing roller heater

Thermo-switch

fixing roller healer ON

AC driver OFF

See page 3-24

Scanner motor @&--%jq+ :page3.17 1 I L___________I

AC driver/DC paver ~-~

supply PCB

Figure 3-6

- 3. OPERATIONS AND TMING

2. DC Controller Outputs (2/3)

Cassette 1 Pick-up clutch solenoid

DC contmller PCB

Lens solenoid

MuWeeder solenoid

- LNsD when 0, SL2 ON

24V J312-11 )

- , i?% when0 SL3ON

I 3. OPERATIONSANDTIMING- ~

3. DC Controller Outputs (313)

DC controllel PCB

r---------- 24V

J309-1

Scanner cooling fan

when 0. FM1 ON

Exhaust fan

I J323-1 I 24V

when O, FM2 ON

I Pm-exposure lamps LA2

_________-_____--________,J,3, J304 I I -2 -6 24V I I I I I I I I I 1 ; -1 -5 _ I I PEXP I when 0. Pm-exposure lamps ON 1 LA731-LA739 I ____________-_____---__I

H V T

I

See page 3-25

i______--__ Figure 3-8

I - 3. OPERATIONS AND TIMING E. Basic Sequence of Operations (Direct, Continuous Copying 2

sheets)

WMUPR POWER SWlTCH165C 175% COPY START key

ON (145-C) (155C)ON SCRV SCRV

\ \ \ WMUP 1 ISTBYl INTR 1 SCFW 1 1 SCFW 1 ILSTRI STBY \

l Numbers in parentheses apply to when the CT Unit is used.

Figure 3-9

Period Purpose Remarks

NMUP (Warm-Up) From switch on until Allows time for fixing Warm-up time varies the fixing roller roller to warm up. with fixing roller temperature reaches temperature at power 165C for the black ON. When the COPY developer or 145C for START key is lighting the CT Unit. (about 75 green. seconds at an ambient temperature of 20C)

NMUPR (Warm- Until the fixing roller Keeps fixing roller * After the WMUPR Jp Rotation) temperature reaches temperature uniform. period ends, the

175C to 180C for the READY/WAIT black developer or Stabilizes drum indicator changes 155 to 160% for the- sensitivity to prepare from orange to CT unit. for copying. green.

- Even when the fixing roller has warmed up, it rotates for at least 3.5 seconds.

NTR (INITIAL qotation)

About 2.2 set after the COPY START key is pressed.

A Paper feed signal is generated to feed the first sheet of copy paper. Note: About 9.9 set both AE and non-AE mode.

Table 3-l (a)

Period Purpose Remarks

4ER (AE Rotation) From when the Moves the scanner In the non-AE mode, scanner moves forward abour70 mm the scanner does not forward about 70 mm from the end of the move forward or in from the end of the image and measures reverse. image until it returns to its home position.

the document density.

XFW (Scanner When the,scanner is Scanning lamp illumi- . A REGISTRATION -orward) moving forward. nates original, and the signal is generated,

l Travel distance reflected optical image and copy paper is changes with copy is transmitted to the fed to transfer area. paper size. photosensitive drum * A PAPER FEED

through mirrors and signal is generated tc lens array. feed the next sheet

of copy paper.

SCRV (Scanner qeverse)

While the scanner is Scanner is moved moving in reverse. back to the Home - The speed of the position to prepare for

reverse movement is the next copy. 2.5 times that of the forward movement.

_STR (LAST qotation)

Until the main motor Ensures discharge of stop after SCRV for the last copy. the last copy ends.

STBY (STANDBY) Waits until the COPY START key is pressed.

Table 3-l (b)

,--- ,

II. EXPOSURE SYSTEM A. Changing the Reproduction

Ratio The reproduction ratio across the drum

is varied by changing the position of the lens. It is moved by the lens drive system. The reproduction ratio around the drum is varied by changing the speed of the scanner. Figure 3-10 shows how the position of the lens is varied to change the reproduction ratio across the drum

DRECT v ENLARGEMENT m&

Figure 3-10

The scanner drive system changes the reproduction ratio around the drum by varying the speed at which mirror 1 moves relative to the peripheral speed of the drum. (The scanner is mirror 1 plus the scanning lamp.)

The mirror speed is faster than the drum peripheral speed for REDUCTION and slower for ENLARGEMENT.

No&, ,(. (( ;I_ (i(_ ,:, ; 2,. ; 1. The relative ~ospion of the mikw if+

_, +t changed to varj, thd, repryductiot-, : ratio.. 17 ,, 4 I

.2. For OHEC? copying, the q&e&of the.mi,rror is the, same a&the

Cl perip_heral speed ofthe drum. :: t* 31 ,I ,: ,, , : ,/P

B. Lens Drive System 1. Outline

,-

The lens is moved by the scanner motor (M2). Normally, the coupling gear is in its upper position, and connects the scanner motor to the scanner drive capstan. To move the lens, the lens solenoid (SL2) goes ON, causing the coupling gear to disengage from the scanner capstan gear and engage with the lens capstan gear. The lens is a floating element type. In operation, the relative position of the lens elements (individual lenses) changes, and the focal length changes as a result, but the changes are to optimize lens sharpness for each reproduction ratio, not to make the lens function as a zoom lens. (The lens should not be dismantled.)

When the scanner motor rotates (CW), the lens will be moved to the left (for ENLARGEMENT) by the capstan and cable.

When the cassette size is changed or when the copier is in the REDUCE mode, the blank exposure shutter moves in relation to the distance over which the lens travels, thereby blanking out the width corres- ponding to the reproduction ratio; see p. 3-31.

The DC controller indicates E210 on the control panel in response to an error in the lens drive system.

-.

I 3. OPERATIONS AND TIMING - I

.-\

Scanner drive capstar

Coupling gear

Solenoid ON \

Lens drive cable

Enlargement direction

DC controller PCB

Figure 3-11

/-Y,

-3. OPERATIONS AND TIMING

2. Basic Lens Drive System Operation (change of reproduction ratio)

POWER SWITCH COPY START key

1; fN AER INTR ) SCFW (,

Scanner home

poskion (Q3) signal pm, m-1 \

@)ccw rotatm

@ CW rotation

@ENLARGEMENT direction

@Blanking by CASSETTE SIZE

/REDUCTION\ \direction )

@Blanking by Selected REPRODUCTION RATIO

Figure 3-12

When the casette size is changed or when the copier is in the ZOOM mode, the lens first returns to the home position before moving to the position that corresponds to

the cassette size and the reproduction ratio. This operation is executed also when the ,_. ZOOM mode is switched to the DIRECT mode.

3. OPERATIONS AND TIMING -

C. Scanner Drive System 1. Outline

The scanner is driven by the scanner motor (M2). The direction of rotation of the scanner motor determines whether the scanner moves forward or backward. The forward speed of the scanner motor is continuously variable to produce the required reproduction ratio. The reverse

speed is fixed regardless of the reproduction ratio (2.5 times the forward speed for DIRECT copying).

The distance that the scanner moves varies to suit the size of copy paper and the reproduction ratio.

The control panel displays E202 in response to an error in the scanner motor (M2) or the scanner home position sensor (Q3).

Mirror 1 mount

Scanner home position

ignal generating plate

Scanner motor (M2)

AC Ny PCB

Figure 3-13

2. Relation Between Scanner Sensor and Signals

Scanner Signal Scanner

sensor name Forward Reverse Meaning

tinner home SCHP - Grid bias ON losition sensor

Q3) -L

* After 0.1 seconds, scanner stops

I

advancing

Table 3-2

3. Basic Scanner Operation

POWER switch ON. COPY START key ON

Figure 3-14

3-16 CCWRlGHT@ 1093CM3N NC.

,/-

4. Scanner Motor Drive System Operation The scanner motor is a 4-phase

stepping motor, and rotates CW and CCW depending on the combination of pulses (A, K B, E) to each phase. a. Clockwise Rotation

The scanner motor driver outputs pulses, and the motor rotates CW. This moves the lens in the direction for REDUCTION, and the scanner moves forward.

For REDUCTION copying, the motor speed increases to move the scanner faster (forward).

b. Counterclockwise Rotation The scanner motor is driven CCW by

pulses of phase relationship opposite of that used to drive it CW. This moves the lens in the direction for ENLARGEMENT, and moves the scanner in reverse.

c. Mechanism The motor-driver circuit controls the

direction and speed of the scanner motor based on the following signals generated by the microprocessor on the DC controller: l scanner motor drive commandMD) A scanner forward command (SCFW) * scanner speed control command(SCCLK)

-- 1

A J109-1

A -2

p

M2 Scanner trotor

B -3

B -1

I

Forward

SCMD SCFW

0 0

I Reverse 0 I 1 I 1 Braking 1 0 1 l 1

1 Still 1 1 1 If 1

1 and 0 are reversed from previous states. 1 or 0 is maintained.

Table 3-3

The motor driver circuit operates as shown in Table 3-3 based on the -- combinations of SCMD and SCFW.

When the scanner is moving forward, the number of SCCLK pulses is varied according to the reproduction ratio selected; when the scanner is moved in reverse, however, the number remains the same.

E202 is indicated if the scanner does not reach the home position within a specific time after it has started to move.

Scanner speed conirol command

Scanner forward -3 command (SCFW) -7

Scanner motor -5 drive command (SCMD) -9

.

1 AC diver /DC power Supply PCB

Figure 3-15

: controller P

-3. OPERATIONS AND TIMING

5. Scanner,Movement for Two-Page Separation Mode (copy count 2)

Dot. L.E. Dot. L.E. Doc.L.E. Dee. L.E. Dm. L.E. Doz. L.E. (1 St page) (1 st page) (1 st we) (2~1 page) (1st paw) w page)

STBY

Figure 3-16

Timing of operations, I, II, and III shown in figure 3-16 is with reference to the leading edge of the first page of the document (fall of Q3 signal).

I: The distance traveled by the scanner from the leading edge of the original is determined by the reproduction ratio and the copy paper size, just as for a normal copy.

II: This is roughly the same as I. If the

forward distance traveled by the scanner is greater than 210 mm the DC controller will judge that 210 mm is the leading edge of the original. If the distance that the scanner moves ,forward is less than 210 mm, the point at which the scanner reverses in I will be the leading edge of the second page of the document.

Ill: Same as I,

D. Document Size Identification 1. Outline

The copier is equipped with auto ljaper selection and auto reproduction ratio selection mechanisms. These mechanisms call for identification of the document size as described below.

To enable such identification, three circuits areattached under the copyboard glass (Figure 3-17); when the copyboard cover is lowered, the DC controller checks the output of the& circuits twice, thereby identifying the document as A3, A4, A4R, or A5R.

The document identification circuit causes its LED to emit light to illuminate the document; the reflected light is then checked by the phototransistor, whose output is sent to the DC controller.

2. Mechanism The DC controller checks the output of

the document identification circuit when the copyboard cover is lowered to about 20 deg. (SW4 ON) and about 1 set second after the over has been lowered to about 5 deg. (SW5 ON).

TheDC controller recognized the presence of a document if the two measurements are identical; conversely, it recognizes the absence of a,document if the measurements are different.

1 DC conboller PCB DC controller PCB I (The thickness of the arrows represents the degree of the level.)

Figure 3-17

When a document is present, the light reflected by the document is checked by the document identification circuit; therefore, the output of the circuit is constant regardless of the angle of the copyboard cover.

When no document is present, the output of the circuit from the first measure- ment is low or none at all; the output

of the circuit from the second measurement, on the other hand, is high because the light is reflected by the document sheet.

If the document is too thick and, therefore, if only SW4 goes ON, the document size is Identified based on the current output level.

Copyboard cowr Copyboard cover

moved up moved down

v 77 20 50 w v

1 I I I

Ddcument identification circuit LED I

Figure 3-18 Document Identification Timing

,-

,--I

\

3. OPERATIONS AND TIMING-

3. Identification of Document Size The DC controller identifies the size of

documents based on the levels of the output from the document identification circuit; see Table 3-4.

Document Document identification circuit Size , 0 i

A3 constant constant

A4 varying constant

A4R constant varying

A!% varying varying

constant: no change to output of document identification circuit; recognizes presence of document.

varying: change to output of document identification circuit; recognizes absence of document.

Table 3-4

Phototransistor LED

\ I

Document identification signal 1 (DSZl)

t

Document identification signal 0 (DSZO)

I

V

~ A4 I , A4R A3 +5fl

ib @Ii Document /dentification circull 0

Document identification circuit 1 t

14. _ ___ . _ 9

I DC controller PCB Copyboard MYW signal 1 (CBCCl)

Figure 3-19

III. IMAGE FORMATION SYSTEM

A. Outline . The basic structure of the image

formation system is as shown below. . .

.

.

Scanning lamp control system Primary/transfer corona current and grid bias voltage control system Controlling developing bias Document density measurement system Developing assembly/Drum cleaner Blanking

I R A I R R I I I/

4 &__o Scanning lamp

+--r-----

--&___._ p /-

L

DC controller PCB

8 I

.1

When shorted, signal sent to indicate black developing assembly.

DC BIAS control command (DCBC)

I)(HVT) It------ 1 (

I -I 747 Figure 3-20

3. OPERATIONS AND TIMING-

,-- ,,, B. Basic Operation ?f Image Formation System (Black Developing Assembly, 2 Copies)

COPY START key

Developing bias AC

* When CT unit is used.

Figure 3-21

When a color developing (CT) unit is used, the AC component of the bias operates when the main motor (Ml) is operating.

? ,

C. Controlling the Scanning Lamp

1. Outline The scanning lamp (LAl) is controlled

by the DC controller PCB; see Figure 3-22. Specifically, the DC controller l turns the scanning lamp ON and OFF. l controls the intensity of the scanning lamp.

2. a.

b.

Mechanism Turning the Scanning Lamp ON and OFF The microprocessor (Q303) on the DC

controller PCB controls the lamp regulator. The scanning lamp goes ON when the scanning LAMP ON command (LAON) is l, and it goes OFF when the signal is 0. Controlling the Intensity of the Scanning Lamp The machine exerts phase control by

the zero-cross signal (ZXDP) to stabilize the light intensity.

CT unit I

The intensity of the scanning lamp is switched between when the black - developing assembly is used and when the, __ CT unit is used.

When the CT unit is used, the LIGHT INTENSITY CONTROL command. (m) goes 1 to raise the lamp voltage by about 3.5 V higher than when the black developing assembly is used.

During AE exposure, however, the voltage (70 V) applied to the scanning lamp remains the same.

The NP6020 adjusts the copy density using its development bias; see p, 3-26. c. Error Protection

The condition of the scanning lamp is monitored using the LIGHT signal (LGHT).

If the LIGHT signal (LGHT) is received ,---- by the DC controller for about 20 set, the error detection circuit generates the AC SHUTGFF signal (ACOFF) to force the relay (KlOl) on the AC driver/DC power supply PCB to go OFF, thereby cutting AC power supply (P. 3-45). In this case, E220 error is displayed.

ACOFF

DC controller PcB- Lamp reg&tor PCB

Figure 3-22

D. Primary/Transfer Corona Current and Grid Bias Voltage Control System

1. Outline The circuit shown in Figure 3-23

controls the primary/transfer coronil current and the bias voltage of the grid of the primary corona. Main functions are as follows. a. Switching primary/transfer corona

current ON/OFF b. Maintaining primary/trahsfer corona

currentconstant c. Switching primary corona grid bias

voltage d. Switching primary corona grid bias

ON/OFF

In order to eliminate the effect of changes in atmospheric conditions on the effectiveness of the corona discharge, the current to the primary corona wire is maintained constant.

The primary corona and transfer corona current are switched ON and OFF by the HVT ON command (m).

The grid bias v&age is switched by the GRID ON signal (GRDON).

2.

a.

b.

3.

Switching Primary/Transfer Corona Current ON/OFF

When HVTON = 1

1. Dlfferentlal amplifier goes OFF.

Lgo;s OF/! Variable ulse width oscillator

LHfh-voltage transformer goes 0 F.

When HVTON = 0

1. Differential amplifier goes ON.

Variable pulse width oscillator goes ON.

L - High voltage transformer goes ON.

Maintaining Primary/Transfer Corona Current Constant If the primary corona current is greater

than the correct value due to changes in the environment, the level (analog) of the feedback signal to the differential amplifier circuit will increase and the output from the differential amplifier circuit will fall. As a result, the primary/transfer coronal current will fall. Similarly, if the primary corona current is too low, it will be increased

If the output side of the high-voltage transformer supplying the primary corona assembly should be overloaded, the current will be limited to a certain maximum.

3-25

4. Controlling Grid Bias Voltage a. During scanning, the DC controller

PCB outputs GRDUFI = 0.

LQ7 goes ON and the comparator output is L.

1 Q6 goes OFF.

L Current does not flow into trans- former T4 and 05 goes ON.

LBias is applied to the grid.

1 The surface of the drum is charged.

The voltage applied to the grid is fed back to the comparator which functions to maintain the grid voltage constant.

b. When scanning is not taking place, the DC controller PCB outputs GRDON = 1.

1 Q7 gees OFF and comparator circuit output is H.

L Q6 goes ON and current flows into T4.

1. Bras IS not applied to the grid.

Under the above conditions, the surface of the drum is not charged, hence toner does not adhere to it (blanking).

The timino at which the arid bias I is switched maybe varied using C&f or in

X6 the service mode (leading edge non- image width adjustment).

E. Controlling Developing Bias ,,___ 1. Outline

The circuit shown in Figure 3-25 - controls the developing bias. Its main functions are as follows. a. Switching AC component of the

developing bias ON/OFF. b. Regulating voltage of the DC

component of the developing bias.

The copy density can be controlled by varying the voltage of the developing bias to suit the following variables.

a. Settings of COPY DENSITY lever and recalibration dial

b. AE sensor output c. Type of developing assembly

When there is a black developing *- assembly in the copier, J306-1 and J306-4 are connected electrically to inform the copier that a black developing assembly is in place.

The photosensitive drum gradually deteriorates with use, causing the potential (VL) of light areas of the drum to increase, so that copy density is not correct for a given setting of the copy density lever. To compensate for this, operate the COPY DENSITY knob, which can be turned to raise the DC bias by exactly the increase in VL, thereby producing clear copies again.

2. Operation a. Switching AC component of the \

developing bias ON/OFF

The square wave generator operates continuously while the copier remains ON.

a) ,When ACBON = 1

LAC bias switch circuit goes ON

1 Output from the square wave generator is cut off.

So AC bias is not supplied to the developing cylinder.

. ..-

b) When ACBON = 0

I, The AC bias switch circuit goes OFF.

The output of the square wave oscillator goes to the Tl drive circuit. This causes the AC high-voltage transformer to generate a 1300VAC AC bias, which is supplied tothe developing cylinder.

Also, the output of the AC high-voltage transformer is rectified and supplied to the static charge eliminator (approx. 3.2 kV). b. Controlling DC bias

The differential amplifier of Figure 3-25 operates when DCBC is 16V or below. (The range of DCBC (analog) is 6 to 16V, as set by the copy density cursor or the AE system.)

1. Drfferentral amplifier goes ON.

1 Vanable pulse-width oscillator goes ON.

LDC high-voltage transformer goes ON.

The DC bias is applied to the developing cylinder.

The copy density knob changes the DC component of the developing bias as shown in Figure 3-24.

COPY DENSITY lever scale

-200

-300- \Y \__j\

-400

-500

I

DC bias

-D

Figure 3-24 Changes in Development Bias (DC component) by COPY DENSITY Knob

Figure 3-25

- 3. OPERATIONS AND TlMlNG

3. Developing Bias Operation /

COPY START key

Figure 3-26

* The value of the DC BIAS CONTROL command and the DC bias are determined by (1) the setting of the COPY DENSITY lever and COPY DENSITY knob, (2) the AE sensor output, and (3) the type of developing assembly installed.

The DC bias used at times other than during scanning depends on the type of developing assembly installed. Black developing assembly: Approx. -320V CT unit: Approx. -220V

,-

3. OPERATIONS AND TIMING m

,---

F. document Density Measurement System

3. Reading the Output of the AE Sensor The AE sensor consists of a

1. Outline There is an automatic density

adjustment (AE) system which adjusts the DC component of the developing bias to suit the density of the original. If the density of the original is more or less uniform, the AE function varies the DC component of the developirig bias to suit the density of the original, so that copies of the correct density will be made.

photodiode (Q702) and an operational amplifier (Q701). If the strength of light striking the photodiode is high, the output voltage (AE) of the amplifier will be small. If the amount of light is small, the output voltage will be large.

The DC controller reads the output at a certain time after the zero-cross signal (ZXDP) is received from the lamp regulator.

The data representing the adjusted AE 2. Operation

The scanner moves forward approxi- mately 70 mm past the leading edge of the original and stops momentarily. The scanning lamp goes ON for approximately one second, the image density is read by the AE sensor, and the sensor output is interpreted by the DC controller. The DC controller then adjusts the DC component of the developing bias accordingly.

reference/slope values are Written to EEPROM when CD3 or CD : is used in the service mode.

[Approx. 65mm

n 1

(I35 IA4 Approx. I 30mm

I Approx. ;

For reference: I36 size

- Approx. ApProx. 36mm

A is the position of the AE sensc~r

25mm --

Figure 3-27

r I

i LrrE __--_- __-_____--- i_-__-- AE sensor PCB DC controller PCB

Figure 3-28

-3. OPERATIONS AND TlMlNG

G. Developing Assembly/ Drum Cleaner

1. Outlines The paddle inside the drum cleaning

unit and also the developing cylinder are rotated by the main motor.

The amount of toner in the developing assembly is sen$ed by the black toner level sensor (TSl).

When the amount of toner falls below the required quantity, the ADD TONER indicator on the control panel will flash.

When the toner in the CT unit is used up, the entire CT unit should be, replaced.

The toner collected by the cleaning blade is stored in the drum cleaning unit.

The developing assembly is pressed against the drum by a cam that presses against the developing assembly rail. (The cam is operated by the developing assembly release lever.)

2. Remaining Toner Sensor The black developing assembly has a

piezoelectric type sensor (TSl) which senses if the toner remaining in the hopper of the developing assembly is above or below the required level.

When the amount of toner in the ,_ hopper is sufficient, the sensor output is 1. When it is below the specified level, the output is 0.

The DC controller makes checks for 30 seconds during copying, if the TONER EMPTY signal (BTEP) is being outputted. ,If the, signal is outputted continuously for 30 seconds, it is regarded as TONER OUT and the DC controller makes the ADD TONER indicator flash.

The CT unit for this copier does not have a toner remaining sensor or waste toner sensor.

3. Torque Limiter There is a torque limiter in the drive

train between the main motor and the drum -- to stop the drum in response to a jam in the drum cleaner.

Figure 3-29

3 - 30 CCWRKiHl@ 1903CUiQNNC

H. Blanking 1. Outline

The area of the drum between the trailing edge of one copy and the leading edge of the next would normally act as an all black area and attract toner if a preventive measure were not taken. This measure is to switch the primary corona OFF and the primary corona assembly grid wire bias ON. (There is no blank exposure; see page 3-25.)

When the copy (cassette) size is a non- default size or when the copier is in the REDUCE mode, the light from the pre- exposure lamp is directed to the photosensitive drum by way of the reflecting plate to prevent adhesion of toner; the blank exposure shutter is moved to open the exposure slit making use of the movement of the lens.

2.

a.

Movement of the Blank Exposure Mechanism When the copier is switched ON, the lens first moves in the direction of enlargement and then returns to the home position. Next, the lens moves in the direction of reduction for blank exposure up to a point that corres- ponds to the cassette size. At the time, the blank solenoid goes ON, and the blank exposure shuttermmoves in the direction of the arrow bythe force of the spring.

Blank exposure shutter

/

Figure 3-31

(Front)

Blank exposure shutter

-3. OPERATIONS AND llMlNC

b. The blank exposure shutter is moved by the cam attached to the bottom of the lens when the lens moves to the blank exposure position, which corres- ponds to the cassette size. The blank solenoid (SL4) goes OFF as soon as the blank exposure shutter has moved to a cut-out to fix the shutter in position; cut-offs are provided for each cassette size. DIRECT and ENLARGE copies are made with the mechanism in this position.

Figure 3-32

c. When the REDUCE mode is selected, the lens first returns to the home position and then moves to a position that corresponds to the selected reduction ratio. At the time, the blank exposure shutter is moved over a distance corresponding to the selected reduction ratio by the cam attached to the bottom of the lens to execute blank exposure.

Figure 3-33

_/--..

---\_

I_

IV. PAPERTRANSPORT SYSTEM

A. Paper Pick-up Assembly and Feeder

1. &line When the pick-up clutch solenoids

(SLl, SL6) engage, the main motor (Ml) turns the roller, feeding a sheet of copy paper to the registration rollers. The number of rotations of the pick-up roller varies with the fength of the copy paper.

The copy paper is fed by the registration rollers so that its leading edge is in line with the leading edge of the toner image on the photosensitive drum. It then passes through the transfer, separation, feed, fixing and delivery stages to the copy tray.

The copy paper is sensed by paper sensors (Q2, Q5). If it does not reach or pass the sensors within the specified period, the DC controller PCB judges that a jam has occurred and causes the JAM indicator on the control panel to flash.

Cassette paper sensors (Q6, Q7) senses whether there is paper in the cassette. If there is not, the CASSETTE PAPER EMPTY signals (UCPD, LCPD) becomes O, causing the ADD PAPER indicator on the control panel to go ON.

Pick-up roller f---w

Control ring

Figure 3-34

-3. OPERATIONS AND TIMING

I--

DC controller PCB

,

Cassette 1 YI I I n

I

Figure 3-35

3-34 CCWRIGHT @ ,993 CbMJN NC

3. OPERATIONS AND TIMING -

2. Pick-up and Feeder Operation

-,~

I I I

Figure 3-36

-3. OPERATIONS AND TIMING

3. Identifying the Cassette Size The presence/absence of a cassette in

the cassette holder and the size thereof are identified by four switches (CSTI through CST4) provided in each cassette holder. Based onthe combinations of the switches

which have been actuated, the micro- __ processor recognizes the presence/absence of a cassette as shown in Table 3-5 and, at the same time, determines where to reverse the scanner and how to control the blank shutter.

(unit: mm) Table 3-5

0: SW is OFF. 1: SW is ON.

3. OPERATIONS AND TIMING-

4. Pick-Up from Multifeeder The multifeeder pick-up roller is

controlled by the main motor (Ml). When the multifeeder paper sensor

(al) identifies copy paper and the COPY START key is pressed, the multifeeder clutch (CL2) goes ON and the pick-up roller starts to rotate to pick up the paper.

When the copy paper reaches the registration roller, the multifeeder clutch (CL2) goes OFF and the pick-up roller stops.

At the same time, the multifeeder solenoid (SL3) goes ON to transmit the drive of the main motor (Ml) to the cam

mechanism, thereby lowering the multi- feeder holding tray to prevent dirt on the next copy paper in duplex.

The multifeeder solenoid (SL3) goes OFF as soon as the first copy paper moves past the pre-registration paper moves past the preregistration paper sensor (Q2); at the time, the multifeeder holding tray returns to the normal pick-up position.

f,Jdte:, : : I,:,, I;;:, .,,, (:::,;I;

The degree of arching fdi,pi$C;b$ f+hj 1 themultifeedar may ,be +fjusted '4' !he:,! serp mode (cm). : ,_ , 11 I ;;l:s,

,,, , I.,.

DC controller PCS

Cam mechanism

Figure 3-37

- 3. OPERATIONS AND TIMING

(P&up)

ifeeder solenoid (SL3)

(Holding plate) _--

Multifeeder solenoid (SL3) ON

j\.

Figure 3-38

the holding plate

Figure 3-39 _

COPY START ke

Figure 3-40

I 3 - 38

,_--. \ B. Fixing Assembly and Delivery Unlit

. 1. Controlling the Fixing Roller

Temperature The upper and lower rollers of the fixing

assembly and the delivery roller of the delivery unit are driven by the main motor (Ml). -

The upper roller is heated by a heater (H1:95OW) built in it.

The DC controller monitors the surface temperature of the upper heater by means of a thermistor (THl) so as to control the temperature to a specific value.

The temperature of the upper fixing roller is controlled as follows: @ For Black Developing Assembly

,/ --Y 175C (at standby, during copy ooeration) 140% (inpre-heat mode)

0 ForCTUnit 155C (at standby, during copy operation) 140C (in pre-heat mode)

To prevent drops in the temperature of the upper roller during continuous copy operation, the control temperature IS switched after 2 copies for long paper (a, Table 3-6) and 4 copies for short paper (b, Table 3-6).

For Black Developing Assembly If the copy is narrow (c, Table 3-6) the control temperature is 175C.

If the copy is wide (d, Table 3-6), the control temperature is switched from 175C to 165C.

For CT Unit If the copy is narrow (c, Table 3-6) the control temperature is 155C.

If the copy is wide (d, Table 3-6), the control temperature is switched from 155C to 165C.

d A3, B4, A4, 85, 11 X 17, LTR, Multifeeder

Table 3-6

The copier is equipped with three protection mechanisms to prevent the fixing heater from going ON at wrong timing.

- The microprocebsor monitors the voltage of THl and indicates EOOO or EOOl in response to an error.

l If the voltage of THl falls below about 0.9 V (equivalent of 215C), the error detection circuit cuts off the supply power to the fixing heater regardless of the output of the microprocessor. If the inside temperature of the thermal

switch rises above 220% the power to the fixing heater will be off.

- 3. OPERATIONS AND TIMING

2. Oil Application Roller The upper fixing roller is provided with

an oil application roller for cleaning and application of oil. Normally, the oil application roller remains away from the fixing roller, and it comes into contact with the upper fixing roller only when copy paper passes through.

The mechanism is driven by the oil application solenoid (SL5); SL5 goes ON 1

,~.

set after the registration roller goes ON; it I then goes OFF as soon as the main motor (Ml) goes OFF.thereby bringing the oil application roller into contact with the upper fixing roller.

DC Controller Pa?

Oil applicalion solenoid J3lC-3 OILSL

Micro- processor : (slave)

__-

J318-2 THl

Delivery roller + )T Upper fixing heater Y

i

A- l Power Supply i

J303-4 , HTRD

Micro processor (master)

L -

Figure 3-41

3. Operation of Fixing Assembly Temperature Control System

Power switch 165C 175C COPY START key

160C

I

I When black developing assembly used / ~_--I, 150C

l/

i/ ; Ji I

I ,I I I ,I / I

Figure 3-42

- 3. OPERATIONS AND TIMING

C. Jam Detection The copier has two sensors to sense

whether copy paper is being fed normally. l Preregistration paper sensor (02) - Delivery paper sensor (Q5)

Paper jams can be identified by the microprocessor by reading signals from the sensors at predetermined times to check if paper is at or not at a sensor at that time, and thus identify if the paper is moving through the copier correctly.

If a jam occurs, the copier memorizes the number of copies that have not yet been made and also the copier settings. This information is stored in the copier, even if the power is cut off by opening the front door in order to reset the copier.

The microprocessor identifies a jam in - any of the following four cases. Also, the microprocessor judges that there is a jam if I one of the sensors detects paper when the power is switched ON.

1. Pick-up Assembly Delay Jam If the copy paper does not reach the

paper sensor of the pick-up assembly within a specified period after paper pick-up-starts, the microprocessor will judge that a pick-up delay jam has occurred, and immediately stop the operation of the copier. Also, the JAM indicator on the control panel will flash and a segment of,the PAPER SELECT/JAM indicator will go ON.

a. Multifeeder

COPY START JAM indicator key ON flashes

_-..

Figure 3-43 (multifeeder pick-up assembly delay jam)

b. Cassettes

COPY START JAM indicator key ON flashes

* Upper cassette: 1.8 set Lower cassette: 2.7 set

Figure 3-44 (cassette pick-up assembly delay jam)

-A

i ,--

1

I

/-- I,

2. Delivery Assembly Stationary Jam If the copy does not pass the delivery

assembly paper sensor within the specified period after the registration roller clutch (CLI) operates, the microprocessor will judge that a delivery unit stationary jam has

COPY START key ON

3. OPERATIONS AND TIMING-

occurred, and immediately stop the operation of the copier. Also, the JAM indicator on the control paperwill flash and a segment of the PAPER SELECT/JAM indicator will go ON.

JAM indicator flashes

Figure 3-45 (delivery assembly stationary jam, A4 size)

3. Delivery Assembly Delay Jam If the copy does not reach the delivery

assembly paper sensor within the specified period after the registration roller clutch (CLl) has operated, the microprocessor will judge that a delivery assembly delay jam

has occurred, and immediately stop the operation of the copier. Also, the JAM indicator on the control panel will flash and a segment of the PAPER SELECT/JAM indicator will light.

COPY START JAM indicator key ON flashes

Figure 3-46 (delivery assembly stationary jam, A4 size)

,/-

- 3. OPERATIONS AND TIMING

V. POWER SUPPLY A. AC Driver/DC Power Supply, 1. Outline

The AC driver/DC power supply PCB is supplied with AC power when the door switch (SW2) and the power switch (SWl) go.ON.

On the other hand, the DC power supply supplies the main body with 24 VDC and 5 VDC.

24 VDC is used to drive the scanner motor (M2), fans and solenoids as well as high-voltage transformer (HVT); 5 VDC is used by the sensors and ICs on the DC controller PCB.

2. DC Power Supply Circuit The 24 VDC for the DC power supply is

supplied by the switching regulator. The 5 VDC, on the other hand, is

supplied by the DC/DC converter after conversion from 24 VDC.

The DC/DC converter generates the reset signal (RESET) after power-on and until the 5VDC supply stabilizes to reset the micro processor, thereby preventing malfunction of the micro processor.

3. AC Driver Circuit

- The DC power supply/AC driver PCB has an AC driver circuit and, based on the signals from the DC controller PCB, controls the SSRs and relays on the DC power supply/AC driver PCB to drive AC loads.

If the DC controller PCB detects an error, the ACOFF signal is generated to turn the relay (KIOI) on the DC power supply/AC driver PCB OFF, thereby shutting off the power to the lamp regulator and the fixing heater.

When the power is shut off, switch the copier OFF, and identify the cause; then, switch the copier OFF.

Note that repeated short-circuiting and resetting can cause the built-in fuse to blow.

3. OPERATIONS AND TIMING B

I AC load

4 FW3 (FW

ix Switching !(;I regulator 5 -

I I-

24V

I DC

I I 24V ADF i Sorter I

C OFF

3ESEl

3,

AC dker/ DC-power swly P&3

___ indicates AC line

Figure 3-47

-I

-3. ObERATlONS AND TIMING

VLSERVICE MODE -- A. Outline

The NP602Os service mode allows the following:

.

.

9.

1)

2)

3)

4) 6)

.

6) 7)

checking the operation of some switches and LEDs. changing data in EEPROM.

Using the Service Mode Detach the VR cover from the rear of the left cover. Check that the COPY START key is glowing green. Press the service switch (SW300) on the DC controller PCB. Check that COO is indicated. Enter the No. of the desired service mode using the numeric keypad on the control panel. For example, the display indicates ED3 in response to a press on 3. Press the SORT/GROUP key. Operate as follows as necessary.

A press on the SORT/GROUP key executes the selected mode; a second press stops the execution.

Change the setting using the numeric

keypad, and press the SORT/GROUP key; the setting will be stored in EEPROM.

Press the AE key twice, and check

CEP is indicated on the control panel; then, press the SORT/GROUP key.

Press the service switch (SW300) to leave the service mode.

I 3 - 46 cm-fRlQm 0 1993 CbmN NC. ClNoN NW20 REV.OMAY 1993PRNTED NJWIN,IMPRME AJIPON)

3. OPERATIONS AND TIMING -

C. Guide to Service Mode

Default

Mode No. Display Remarks Settings

p j-f 1-1 AE sensor output Use it when adjusting the AE h h(rr

reference point/slope; see p. 3-52.

_

p r( ( AE adjustment

L I-1 1 23

A higher setting causes copies of newspaper to become lighter; see P.3-52. (unit: O.lV)

0 to 50

r I-

r

Leading-edge registration A higher setting delays the

I!- II, adjustment (registration roller registration roller ON timing. ON timing adjustment)

32 (unit: 0.25 mm)

0 to 63

r r(,( Leading-edge non-image A higher setting increases the

L LI-1 width adjustment (grid bias 32

leading edge non-image width

switch timing adjustment) (unit: 0.25 mm)

0 to 63

r; ro Degree of arching (multifeeder A higher setting delays the

I! 8-f i pick-up; clutch off timing 32 multifeeder clutch OFF timing. adjustment) (unit: 0.25 mm)

0 to 63

3 - 47

-3. OPERATIONS AND TIMING

Default Mode No. Display Remarks

Settings

)T r j- I- UZI

Leading edge registration adjustment (2nd page in

A higher setting advances the 32

page separation; registration registration roller ON timing.

roller ON timing adjustment) (unit: 0.25 mm)

0 to 63

P I( c Leading edge non-image A higher setting increases the

h UU width adjustment (2nd page in page separation; grid bias

32 leading edge non-image width (unit: 0.25 mm)

switch timing adjustment)

0 to 63

c 3 7 Automatic paper selection Selects/Deselects the APS (APS) mode setting

1 mode at time of power-on: 1, APS ON; 0, APS OFF.

Oor 1

r rcy Auto shut-off mode setting Selects/Deselects the Auto

hUrr 1 shut-off mode: 1, Auto shut-off ON; 0, Auto shut-off OFF.

Oor 1

r rca The output voltage of About 6 (0.6V) when the

t U-I document size 0 is indicated copyboard cover is closed. on the controlpanel

- About 40 (4.OV) when the copyboard cover is open.

(unit: 0,lV)

i

/

/--

.

I-

3. OPERATIONS AND TIMING -

Mode No.

Default Display Remarks

Settings

p (c( The output voltage of docu- About 6 (0.6V) when the

I- 11-I ment size 1 is indicated on the copyboard cover is closed.

control panel - Abbut 40 (4.OV) when the

copyboard cover is open.

(unit: 0.1 V)

r ( ( Cassette size 2

h I(

,r ;,=I Cassette size 1

-

The size of the cassette is indicated in code in response to the output of the activated

_ cassette switch; see Table 3- 7.

c

[Id LED ON check (on control

1 [ panel) -

c 1-J

(c AE mode setting 1

Selects/Deselects the AE mode at time of power-on: 1, AEON; 0, AE OFF.

0 or 1

c r;s

For factory adjustment Do not change the setting; 0 i.e., keep it to 0.

0 to 5

r (0 EEPROM reset Initializes EEPROM on the

I!- 1U _ DC controller PCB.

Code

0

1

2

3

4

5

6

7

8

~~~ 11 Code Cassette size Cassette size No cassette 9

85 l1O

u3 11

A4 12

B5-R 13

B4 14

A4-R 15

A3 16

A5R

Ui

u2

Letter

STMT-R

Legal

Letter-R

11x17

Multifeed

i

,-

Table3-7 Cassette Size Codes

3. OPERATIONS AND TIMING -

~ D. Adjustment - ~

1. image Leading Edge Non- Reproduced Area There is a white strip on the bottom of

the copyboard glass in the position shown in the figure below. if bias is being applied to the grid of the primary corona while the scanner is passing the white strip, the leading edge of the copy will be reproduced blank. if the leading edge non-image width is outside the standards, adjust the timing at which the grid bias goes from OFF to ON in the service mode (tU3 ).

,-\ \

Suriace of copyboard glass

Approx. 1Omm

Figure 3-49

The standard image leading edge non- reproduced area on a DIRECT copy of a test sheet is 2.0 f 1.5 mm.

---. I

Figure 3-49

I A higher setting ( Co3 ) increases the leading edge non-image width; in units of

~ 0.25 mm.

13. OPERATIONS AND TIMING

2. AE Adjustment Make the following adjustments when

the AE sensor or the DC controller PCB has been replaced.

8) Remove the test sheet, place a sheet _ of newspaper on the copybo8rd, and lower the copyboard cover.

9) Press the SORT/GROUP key. \

1)

2) . 3)

4)

5)

8)

Remove the VR cover at the back of the left cover. Set the power switch ON. Wait until the WAIT period has ended. Place an NB-3, NA-3 or NA-2 test sheet on the copyboard, and lower the copyboard cover. Press switch SW 300 on the DC controller PCB. l COO will appear on the COPY COUNT/RATIO indicator on the control panel.

l If LiY3 does not appear, press the 0 number key on the control panel so that &Xl appears.

Press the SORT/GROUP key on the control panel. *The scanner will move forward to the AE measuring position, then the scanning lamp will go ON.

Adjust VR301 on the DC controller so that 22 appears on the COPY COUNT/RATIO indicator.

Document densitv Test sheet Sheet of newspaper

Figure 3-50

7) Press the SORT/GROUP key. *The scanning lamp will go OFF, and the scanner will return to the HOME

*The copier will p,erform-the same operations as described in step 5).

10) Make a note of the num-erical value displayed on the COPY COUNT/RATIO indicator.

11) Press the SORT/GROUP key. *CCLIwill appear on the COPY COUNT/ RATIO indicator.

12) ,Press the 1 number key. C3 I will appear on the COPY COUNT/ RATIO indicator.

13) Enter the value recorded in step 10) using the numeric keypad.

--

L,, Document density Test sheet Sheet of neWSPaPer

c3 : when the setting is lowered. q : when the setting is raised.

Figure 3-51

,-

__ ,I

7

._

3. OPERAlIONS AND TIMING-

VII. SELF DIAGNOSjS The DC controller PCB has a

microprocessor that diagnoses the functions of the copier (particularly the sensors) at appropriate intervals. If this microprocessor detects an error, it will display the type of

the error on the indicator on the control panel.

The table below shows the various fault codes, their meaning, and the correspon- ding detection timing.

Example of EOOO code indication: EaafliJlight alternately.

Code displayed Main cam3 Fault criteria

E 3ez Thermistor (THl). Fixing roller - If the temperature of the fixing rollers after 40 heater (Hl), AC driver/DC power seconds is virtually the same as when the copier is supply PCB, DC controller PCB. turned ON. (This indication does not appear if Operation of thermoswitch warm-up is completed within 30 seconds.)

- If the temperature of the fixing roller drops below 100% for 0.1 seconds or longer after warm-up is completed.

rrrrO t Defective thermistor (THl), AC II the temperature remains 220C or higher for 0.1

Iuu f driver/DC power supply PCB, seconds or longer. Fixing roller heater (Hl), or DC controller PCB

r ri -1 B-4

CWZU Counter, DC controller PCB II the break signal is emitted continuously for 0.1

seconds or more the counter is not being driven.

DC controller PCB

1, If the scanner is not at the HOME position (SCHP = 0) when the COPY START key is pressed. If the scanner does not return to the HOME position (SCHP remains 0) within 15 seconds (A4 size) after it starts to reverse.

2. If the scanner is in the HOME position (SCHP = 1) when the COPY START key is pressed. * If the scanner does not leave the HOME

position (SCHP remains 1) within 1.5 second after it staris to advance.

- If the scanner does not return to the HOME position (SCHP remains 0) within 1 second after it leaves the HOME position (SCHP = 0).

E2 rU Lens home posirion sensor (Q4), - If the lens does not return to the HOME position or DC controller PCB (LHP remains 0) within 2.5 seconds. * If LHP remains 1 for at least 4 seconds. - 7 7 17

tCCM

lamp regulator PCB * At the lamp ON liming, LAON=l is not true. Scanning lamp - At the lamp OFF timing, LAON=O is not true.

EP

- _ro DC controller PCB The communication between microprocessor (master) and microprocessor (slave) is interrupted.

E zv# DCcontrollerPCB If the data in EEPROM has been rewritten more than specified.

- -tr 1

tco I

AC driver/DC power supply, If the mains frequency is out of the allowed range. DC controller PCB

E -eBu

ADF controller PCB, AC driver/DC If ADF remains 0 for 12 seconds or longer. power supply PCB, or DC controller PCB

E s33

Sorter cuntroller PCB or DC . If the copier does not communicate with the sorier controller PCB for at least 12 seconds.

* If the SORTER STANDBY signal does not return within 35 seconds after the BCR signal is outputted.

- 3. OPERATIONS AND TIMING

Note: (0, I

After self diagnosis has been executed, : the copier may be: reset by switching it : OFF and, then ON irnless EOOo3 or EOOI : is indicaied,onthe display. ,

,__ X

This consideration is made to prevent the user from resetting the copier when the fixing assembly has a serious fault (open thermistor or others) that can damage the assembly:

Rest the copier as follows if EOOO or 'EOOl is indicated:

Detach the VR cover. Press the service switch (SW300) on the DC controller. Check that P and OFF alternate on the control panel COPY COUNT/ RATIO indicator. Switch the copier OFF.

I ._

I. EXTERNALS A. External Covers

-0

-a

@ Copyboard cover @ Control panel @ Left cover @ Front door @ Delivery cover 0 Cassettes @ Copyboard glass @ Lower left cover

Figure 4-100

@ Right cover @ Rear cover @ Rear upper cover @ Right door

Figure 4-101

Detach the covers as necessary when cleaning, checking, or repairing the inside of the machine; covers that can be detached by mere removal of the fixing screws are omitted from the discussions.

Note: : (I ,,;,;

:I Make sure t&t the copi& doors are closed before detaching the copyboard,: glass. Use alcohol when cleaning. the glass; do not use solvent, or the white paint along thelright edge.of the glass m&y, melt.

1. Detaching the Inside Cover 1) Remove the two screws @ that hold

the front cover bands in place. 2) Remove the screw, and detach the

fixing assembly knob 0. 3) Remove the four mounting screws 0,

and detach the inside cover 0.

Figure 4-102

B 4. MECHAMCALSVSTEM

2. Detachfng the Right Door 1) Open the right door. 2) Disengage the two hooks 0.

Figure 4-103

3) Detach the right door @ as if to lift it out of the cut-offs @.

3.

1)

;;

4)

Figure 4-104

Detaching the Upper Rear Cover Detach the copyboard cover, copy- board glass, and rear cover. Remove the two screws 0. Disengage the hook 0. Detach the upper rear cover @ as if to lift it.

Figure 4-l 05

B. 1.

1) 2)

Control Panel ,,-. Detaching the control panel Detach the inside cover. Remove the five screws 0, and lift the control panel @ toward the front to detach.

Figure 4-106

3) Lift the control panel @ to the front, and turn it over.

,Note:,s*.! ,:, ^ ,_^

Do not force. the control. pan&, or. the harqess ~nn&tedto it may snSpoff. j -_

,,

Figure 4-107 -

4. MECHANICAL SYSTEM - I

,,_ C. Copyboard Cover 1. Replacing the Copyboard Sheet

The copyboard sheet is attached to the copyboard cover using adhesive tape and can be detached by pulling at its corner.

After replacement, make sure to even out the sheet for even contact.

2. Scanner Cooling Fan (FMl) 1) Detach the rear cover. 21 Detach the filter case @as if to lift it - from the bottom.

D. Fans 1. Outline

The NP6020 is equipped with two fans to circulate the air inside the machine, L

thereby preventing the machine from overheating.

Each fan serves the following function.

/- _ : \ Scanner cooling fan (FMl): cools the scan- ner feeder fan

air to the 3) 4)

Exhaust fan (FM2):discharges outside.

5)

Flgure 4-108

Figure 4-109

Cut off the harness band as necessary. Disconnect the connector @ (J309) from the DC controller PCB. Remove the three screws 0, and detach the scanner cooling fan 0.

Figure 4-110

-i

- 4. MECHANICAL SYSTEM

3.

1)

321

4)

Exhaust Fan (FM2) Open the front door, and detach the drum unit. Detach the rear cover. Disconnect the connector (J323), and remove the two screws from the DC controller PCB; then, shift the DC controller PCB. Remove the two screws @ from the rear of the exhaust fan.

1 5)

6)

Figure 4-111 (rear view)

Detach the ozone filter and the inside cover; then, release the feeder assembly. Hold the exhaust fan assembly @ on its bottom, and remove the two screws 0; then, pull the assembly to the front.

Figure 4-112

4. MECHANICAL SYSTEM W

fr.,, II. DRIVE SYSTEM A. Lens Drive Assembly

The unit is adjusted at the factory with high precision using special tools. Do not remove parts or loosen screws other than those discussed.

1. Detaching the Lens Cable 1) Detach the copyboard cover, copy-

board glass, lens cover, rear cover, and upper rear cover.

2.

1)

2) Remove the three screws @ shown in Figure 4-201, and detach the upper frame.

2)

3)

3)

4)

Figure 4-201

Mark the position of the pulley mount and the cable mount using a scriber; see Figure 4-200. Remove the two @ screws that hold the pulley mount @ in place; see Figure 4-202.

Figure 4-202

5) Detach the cable (cable mount).

Routing the Lens Cable Remove the two screws that hold the ,-- lens pulley fixing plate in place, and detach the lens pulley; see Figure 4- 200. Wind the lens cable around the lens pulley as shown in-Figure 4-200; then, fix it using two screws, Shift the pulley mount to the position marked with a scriber, and fix it in place using two screws.

_-._

4-6 CLWRlOHT @ 1093 CINON NC. CANON NPW20 REV.OMAV 1993pRNTED NJWMI(IMPRME AUJAFON)

B. Scanner Drive Assembly

,..--A

1.

1)

2)

Pulley 1

Topgroove of the pulley

Y3

Detaching the Scanner Cable Mark the position of the mount, and loosen screw B (1 PC.), which hold the mount in place. Loosen screw A (1 PC.), and detach the scanner cable.

2.

1)

2)

3)

Figure 4-203 Scanner Drive Assembly

Attaching the Scanner Cable Route the scanner cable as shown in Figure 4-203. Position the fixing plate where a mark has been put using screw A. Tighten screw B.

B 4. MECHANICAL SYSTEM

3. Adjusting the Mirror Position (optical distance between No. 1 and No. 2 mirrors) Adjust the position of the mirror after

attaching the scanner cable. To adjust, relocate the fixing used for

the No. 1 mirror mount; loosen the two screws.

i.

ii.

1)

2)

3)

n 4)

Draw a line 10 mm from both ends of copy paper (A4 or A3) as shown in Figure 4-204.

--j FlOmm lOmm-+

Figure 4-204

Make a copy of the sheet on which lines have been drawn; call the copy obtained this way sheet A. Place a blank sheet of paper on the copyboard, and feed the sheet on which lines were drawn in the manual mode; call the delivered sheet sheet B. Sheet B will show contraction by heat. Put the left lines on sheet A and sheet B together, and adjust the position of the No. 1 mirror mount so that x and y in Figure 4-205 are identical.

Figure 4-205

x=y correct

XY move the No. 1 mirror mount into the direction of @

X

I 5.

1)

2)

I

,/~--. , ,

Using the Mirror Cleaning Tool

Mirror 6 cleaning assembly

Mirror 5 cleaning assembly

Figure 4-207

Cleaning the No. 5 Mirror Detach the copyboard glass and the lens cover; then, remove the screw, and detach the mirror cleaning tool from the lens mount. Detach the lens cover, and insert the mirror cleaning tool as shown in Figure 4-208.

Mirror cleanmg tool

Vo. 5 mirror

3) Push the mirror cleaning tool against ~ the No. 5 mirror as shown in Figure 4- 209, and clean the lens by sliding it back and forth.

No. 4 mirror

6.

1)

2)

Figure 4-208 7.

Mirror cleaning tool

Figure 4-209

Cleaning the No. 6