Canon PC800, PC900 Service Handbook

REVISION 0

PC860

F13-8491 TYA00001-

PC880

F13-8291 TZA00001-

PC890

F13-8242 UAA00001-

PC920

F13-8431 TVB00001F13-8441 PUD00001-

PUE00001-

F13-8461 PUH00001-

PC921

F13-8432 TVC00001-

PC940

F13-8436 TVD00001-

PC941

F13-8437 TVE00001-

PC950

F13-8231 TVF00001F13-8241 PUF00001-

PUG00001-

PC960

F13-8434 TVG00001-

PC980

F13-8232 TVH00001-

PC981

F13-8233 TVJ00001-

AUG. 1999

FY8-23B6-000

IMPORTANT

THIS DOCUMENTATION IS PUBLISHED BY CANON INC., JAPAN, TO SERVE AS A SOURCE OF REFERENCE FOR WORK IN THE FIELD. SPECIFICATIONS AND OTHER INFORMATION CONTAINED HEREIN MAY VARY SLIGHTLY FROM ACTUAL MACHINE VALUES OR THOSE FOUND IN ADVERTISING AND OTHER PRINTED MATTER.

ANY QUESTIONS REGARDING INFORMA TION CONTAINED HEREIN SHOULD BE DIRECTED TO THE COPIER SERVICE DEPARTMENT OF THE SALES COMPANY. THIS DOCUMENT ATION IS INTENDED FOR ALL SALES AREAS, AND MA Y CONTAIN INFORMATION NO T APPLICABLE TO CERTAIN AREAS.

Printed in Japan

Imprimé au Japon

Use of this manual should be strictly supervised to avoid disclosure of confidential information.

Prepared by

OFFICE IMAGING PRODUCTS TECHNICAL SUPPORT DIVISION

CANON INC.

5-1, Hakusan 7-chome, Toride-shi, Ibaraki 302-8501 Japan

• This service handbook covers the models shown in the following table. Be sure to have a good understanding of the difference from model to model before referring to this handbook.

Model

PC860 PC880 PC890 PC920 PC920 PC920 PC920 PC921 PC940 PC941 PC950 PC950 PC950 PC960 PC980 PC981

Type code

TYA TZA

UAA

PUD

PUE PUH TVB TVC TVD TVE

PUF PUG

TVF TVG TVH

TVJ

Multi-

feeder

√ √

√ √ √ √ √ √

Single feeder

√

√ √ √ √ √ √ √

Zoom

√ √ √ √ √ √ √

√ √

√ √ √ √

Default

ratio

2R2E 2R2E 2R2E 2R2E 2R2E 2R2E 3R1E 3R1E 3R1E 3R1E 2R2E 2R2E 3R1E 3R1E 3R1E 3R1E

Density

correction

switch

(SW101)

√ √ √ √ √ √

√ √

The notation “√” indicates that the item in question is available.

ADF

standard

√

√ √ √

Cassette

250 sheets 250 sheets 250 sheets

Universal Universal Universal Universal Universal Universal Universal Universal Universal

500 sheets

Universal 500 sheets 500 sheets

Copying

speed

(cpm) at

Direct

12 12 12 10 10 10 10 10 13 13 12 12 13 10 13 13

CHAPTER 1 MAINTENANCE AND INSPECTION

A. Periodically Replaced Parts .........1-1

B. Durables and Consumables .........1-1

C. Scheduled Servicing .................... 1-1

D. Storing and Handling

the Cratridge ................................1-2

D-1.Storing the Car tr idge with

the Packaging Seal Intact ............1-2

D-2.Storing and Handling the Car tr idge

with the Packaging Seal

Removed......................................1-3

E. Image Adjustment Basic

Procedure.....................................1-7

F. Points to Note for Servicing .........1-8

CHAPTER 2 STANDARDS AND ADJUSTMENTS

A. Mechanical...................................2-1

B. ADF ........................................... 2-26

C. Electrical ................................... 2-37

CHAPTER 3 ARRANGEMENT AND FUNCTIONS OF

ELECTRICAL PARTS

A. Sensors and Solenoids................3-1

B. Switches....................................... 3-2

C. Lamp, Heater, Motor, Etc. ............3-3

D. PCBs ............................................3-4

E. ADF ..............................................3-5

F. Variable Resistors (VR) and

Check Pins by PCB......................3-6

CHAPTER 4 SELF DIAGNOSIS

A. Self Diagnosis .............................. 4-1

APPENDIX

A. General Timing Chart.................. A-1

B. Signals and Abbreviations .......... A-3

C. General Circuit Diagram ............. A-5

D . Special T ools ............................... A-7

E. Solvents/Oils ............................... A-8

F. Specifications.............................. A-9

iii

CHAPTER 1 MAINTENANCE AND INSPECTION

A. Periodically Replaced Parts

The machine does not have parts which must be replaced on a periodical basis.

B. Durables and Consumables

The machine does not have items designated as durables or consumables.

C. Scheduled Servicing

The machine does not have any parts which require scheduled servicing.

1-1

CHAPTER 1 MAINTENANCE AND INSPECTION

D. Storing and Handling the Cartridge

The cartridge is subject to the effects of the environment whether its packing seal is intact or removed or whether it is inside the machine or otherwise, changing over time regardless of the number of copies made. The degree of change is highly dependent on the site of installation and how it is maintained, and no general rule may be drawn; however, it is important to exercise care when storing or handling it.

D-1. Storing the Cartridge with the Packaging Seal Intact

If you are storing the cartridge in a warehouse or workshop, be sure that the environment is as indicated in Table 1-1; in addition, keep the following in mind:

• Avoid direct rays of the sun.

• Avoid vibration.

• Do not subject it to impact (as by hitting or dropping it).

Normal (9/10 of entire storage period)

Harsh (1/10 of entire storage period)

Temperature

Temperature changes (within 3-min period; approx.)

Normal (9/10 of entire storage period)

Harsh (1/10 of entire storage period)

Humidity

Atmospheric pressure

Table 1-1 Temperature/Humidity Conditions for Storage

Temperature

between -20°C/-4°F and 40°C/104°F

High temperature

Low temperature

High humidity

Low humidity

between 0°C/32°F and 35°C/95°F

between 35°C/95°F and 45°C/113°F

between -20°C/-4°F and 0°C/32°F from 40°C/104°F to 15°C/59°F

from -20°C/-4°F to 25°C/77°F

between 35% and 85% RH

between 85% and 95% RH

between 10% and 35% RH

between 613.3 and 1013.3

(hPa; 0.6 to 1 atm)

Humidity

90% or less

1-2

Table 1-2 Conditions for Transportation

CHAPTER 1 MAINTENANCE AND INSPECTION

D-2. Storing and Handling the Cartridge with the Packaging Seal

Removed

The photosensitive medium is an organic photoconducting (OPC) material, which would dete-

riorate if subjected to storing light.

The cartridge also holds toner, requiring the user to exercise care when storing or handling it.

(Be sure that the user stores it in an appropriate storage box for storage.)

1. Storage after Removing the Packaging Seal

a. Avoid areas subject to the direct rays of the sun, i.e., near a window. Do not keep it in a car for

a long time, as it will be subjected to an extremely high temperature. (This applies even if the cartridge is inside a protective box.)

b. Avoid areas subjected to high or low temperature/humidity or where temperature or humidity

tends to change abruptly (e.g., near an air conditioner). c. Avoid areas subject to dust, ammonium gas, or organic solvent. d. Make sure that the cartridge is stored at 40°C/104°F or lower.

1-3

CHAPTER 1 MAINTENANCE AND INSPECTION

2. Handling the Cartridge

a. Before setting the cartridge in the machine or if copies have white spots as when it starts to run

out of toner, hold the cartridge level and shake it about 90° several times as shown in Figure 11 to even out the toner inside. If you shake it in a different way, the toner can spill out of the developing assembly or the cleaning assembly.

Figure 1-1

b. Do not place the cartridge on its end or turn it over as shown in Figure 1-2.

Figure 1-2

1-4

CHAPTER 1 MAINTENANCE AND INSPECTION

c. Do not touch the surface of the photosensitive drum as by opening the shutter for the photosen-

sitive drum cover found at the bottom of the cartridge.

(If you have soiled the surface of the photosensitive drum, wipe it with a flannel cloth coated

with toner. Do not clean it using solvents.)

d. Do not disassemble the cartridge.

e. Do not subject the cartridge to excess vibration or impact. In particular, do not impose force on

the shutter for the photosensitive drum shutter.

f. Make sure that it is out of reach of children.

g. The photosensitive drum is susceptible to strong light, and the light-blocking shutter is pro-

vided as a means of protection.

If the drum is exposed to strong light for a long time, however, copies can start to show white

spots or vertical bands. Try leaving the machine alone as long as possible if such a problem is

noted; the memory (i.e., cause of white spots or vertical bands), however, may not disappear.

Keep the following in mind:

Caution:

1. Try to work briskly when removing a jam or replacing the cartridge.

2. If the cartridge must be taken out of the machine for storage, be sure to put it in a protective box or put a cover over it. Do not leave it outside the machine unprotected.

Reference:

If the photosensitive drum is exposed to light of 1500 lux (general lighting) for 5 min and then left alone in a dark place for 5 min, it should recover so that it will not cause practical problems. Nevertheless, avoid direct sunshine. (The rays of the sun is as strong as 10000 and 30000 lux.)

1-5

Making Pre-Checks Adjusting the Optimum Density

Clean the parts.

E. Image Adjustment Basic Procedure

Set it at the middle.

Select non-AE, and set the copy density adjusting lever to the middle index; then, make two to three copies of the Test Sheet (NA-3).

Scanning system, pickup/feeding system, delivery assembly

Is the copy density

correction switch (SW101) set

to the middle index?

(Note 1)

YES

Is gray scale No. 9

barely visible?

Can the

deviation be corrected

using the copy density correction

switch (SW101)?

(Note 1)

Is the optimum

density obtained by intensity

adjustment?

(Note 3)

YES

END

Check the following:

1. Density of gray scale No. 9

2. Presence/absence of difference between front and rear (Note 2)

3. Density of gray scale No. 1 (good or bad; Note 2)

4. Fogging of background (Note 2)

Check the following:

1. Cartridge

2. Scanning lamp

3. AE sensor PCB

4. DC controller PCB

5. Composite power supply PCB (See the appropriate troubleshooting procedure.)

Note:

1. Applies only if the machine is equipped with a copy density correction switch (SW101).

2. The machine is not equipped with a function to correct image faults. See the appropriate troubleshooting procedure.

3. See p. 2-38.

1-7

F. Points to Note for Servicing

Copyboard, Scanner

Item Tools/solvent Work/remarks

Copyboard cover Copyboard glass Lens Blower brush Cleaning. Scanning lamp Reflecting plate

No. 1 through No. 6 mirror

Fixing Assembly, Delivery Assembly

Item Tools/solvent Work/remarks

Alcohol Alcohol

Lint-free paper

Blower brush

Cleaning. Cleaning.

Dry wiping. If dirt cannot be removed,

dry-wiping with lint-free paper.

Cartridge

Item Tools/solvents Work/remarks

Drum cover shutter

Pickup, Feeding, and Transfer Assemblies and Static Eliminator

Item Tools/solvents Work/remarks

Most cloth

Cleaning; be sure to remove all toner to prevent toner soiling images.

Inlet guide

ADF

Item Tool/solvent

Feeding belt

Separation pad Pickup roller Cloth moistened with

*Be sure to wring it well.

Cloth moistened with water*

Cloth

water* or alcohol

Solvent Cleaning.

Work/remarks

Dry-wiping.

Cleaning. Cleaning.

Single-feeder pickup roller

Multifeeder, Pickup roller

Cassette pickup roller

Registration roller

Transfer guide

Transfer charging roller

Static eliminator

Feed belt

Moist cloth or alcohol

Moist cloth Moist cloth Lint-free paper

Special brush Moist cloth

Cleaning.

Cleaning. Cleaning. Cleaning. Do not use

water or solvent. Take care not to touch it or leave solvent or oil.

Cleaning. Cleaning.

1-8

CHAPTER 2 ST ANDARDS AND ADJUSTMENTS

CHAPTER 2 STANDARDS AND ADJUSTMENTS

A. Mechanical

1. Copier

a. Leading Edge Non-Image Width

Make adjustments so that the leading edge non-image width is 2.0 ±1.5 mm when the Test

Sheet is copied in Direct.

Caution:

If you have performed this adjustment, be sure to adjust the image leading edge margin.

2.0 ± 1.5mm

Figure 2-1

1) Turn VR105 on the DC controller PCB so that the width is as indicated.

VR105

J130

J101J131

VR103VR102

J107

J114

J103

J104

J102

J101

VR104VR105

J105

J102

VR106

VR107

J106

J109

Figure 2-2

Turing VR105 and Leading Edge Non-Image Width

Direction of VR105

Clockwise

Counterclockwise

Leading edge non-image width

Decreases

Increases

Table 2-1

2-1

CHAPTER 2 ST ANDARDS AND ADJUSTMENTS

b. Image Leading Edge Margin (registration activation timing)

Make adjustments so that the leading edge margin is 2.5 ±1.5 mm when the Test Sheet is

copied.

Caution:

Be sure to check that the leading edge non-image width is as indicated before performing this adjustment.

2.5 ± 1.5mm

Figure 2-3

1) Turn VR104 on the DC controller PCB so that the margin is as indicated.

VR104

J130

J101J131

VR103VR102

J107

J114

J103

J104

J102

J101

J102

VR104VR105VR106

J105

VR107

J109

Figure 2-4

Turing VR104 and Image Leading Edge Margin

Direction of VR104

Clockwise

Counterclockwise

Image leading edge margin

Increases

Decreases

Table 2-2

J106

2-2

CHAPTER 2 ST ANDARDS AND ADJUSTMENTS

c. Adjusting the Mirror Position (optical length between No. 1 mirror and No. 2 mirror)

If you have replaced the scanner drive cable, you must adjust the mirror position, by changing

the position of the cable retainer of the No. 1 mirror mount.

Reference:

1. As more and more copies are made, the cable tends to become slack, requiring adjustment.

2. If the optical length between the No. 1 mirror and the No. 2 mirror is not correct, the horizontal reproduction ratio will be wrong, causing poor sharpness or blurred images.

1) Fit the mirror positioning tool (FY9-3009) as shown.

Figure 2-5

2) Remove the copyboard glass.

3) Loosen the screws used to secure the cable retainer at the rear and the front of the No. 1 mirror mount [1].

[1]

Figure 2-6

2-3

CHAPTER 2 ST ANDARDS AND ADJUSTMENTS

4) Turn the cable drive pulley [3] so that the three shafts [2] of the mirror positioning tool for the front and the rear may be arranged as shown.

[3][2]

[2]

Figure 2-7 (rear)

[2]

Figure 2-8 (front)

2-4

CHAPTER 2 ST ANDARDS AND ADJUSTMENTS

[1]

5) While keeping the condition of 4), tighten the positioning screw at the rear and the front of the No. 1 mirror mount [1].

[1]

Figure 2-9 (rear)

Figure 2-10 (front)

2-5

CHAPTER 2 ST ANDARDS AND ADJUSTMENTS

d. Checking the Force of the Cassette Spring

If the force of the spring used to hold up the holding plate of the cassette is not correct, pickup

faults or the like can occur.

If a fault is suspected, check the force of the spring using a spring gauge (CK-0054), and

replace the spring if it is not as indicated:

Standard: 970 ±150 g

Making Measurements

Push the spring gauge against the middle of the spring as shown, and check to make sure that the reading of the spring gauge is 970 ±150 g when the holding plate is 18 mm away from the bottom of the cassette.

Spring gauge (CK-0054)

Holding plate

Cassette spring

18mm

Cassette

Figure 2-11

2-6

e-1. Routing the Scanner Drive Cable

CHAPTER 2 ST ANDARDS AND ADJUSTMENTS

Wind 1.5 times. (black cable) Wind 7.5 times. (silvercolored cable)

Figure 2-12

2-7

CHAPTER 2 ST ANDARDS AND ADJUSTMENTS

e-2. Routing the Scanner Drive Cable

1. Before Starting the Work

Prepare the following:

• Mirror positioning tool (FY9-3009)

• Cable clip (FY9-3017)

• Adhesive tape

1) Set the mirror positioning tool as shown.

Figure 2-13

2) Prepare about five strips of adhesive tape (each one about 20 × 50 mm).

3) Remove the copyboard glass.

4) Disconnect the connectors (J101, J131) [1] from the DC controller PCB.

[1]

Figure 2-14

2-8

CHAPTER 2 ST ANDARDS AND ADJUSTMENTS

5) If the machine is equipped with an ADF, free the hook [2], and disconnect the two relay connectors [3] from the left upper stay [4].

[2]

[3]

Figure 2-15

6) Remove the three screws [5], and detach the left upper stay [4].

[4]

[5]

[4][5]

Figure 2-16

2-9

CHAPTER 2 ST ANDARDS AND ADJUSTMENTS

7) Remove the four screws [7], and detach the lens cover [8].

[7]

[8]

Figure 2-17

2-10

CHAPTER 2 ST ANDARDS AND ADJUSTMENTS

[1]

[3]

Top view

[3]

2. Routing the Reversing Cable

1) Wind the reversing cables (silver-colored) [2] on the cable drive pulley [1] 7.5 times with the longer of the two on top; then, secure it in position with a cable clip [3].

[1]

Longer end

[2]

Figure 2-18

Shorter end

Face with a marking

Figure 2-19

2-11

CHAPTER 2 ST ANDARDS AND ADJUSTMENTS

2) Put the cable drive pulley [1] into the shaft [4], and secure it in position with an E-ring [5]. When putting the cable drive pulley into the shaft, be sure that the hook is at the front.

[5]

Hook

[1]

(front)

[4]

Figure 2-20

3) Hook the shorter end [6] on the pulley [7].

[7]

[6]

2-12

Figure 2-21

CHAPTER 2 ST ANDARDS AND ADJUSTMENTS

4) Lead the shorter end [6] under the No. 1 mirror mount [8] and the No. 2/3 mirror mount [9]; then, hook it on the left rear pulley [10] and the pulley [11] of the No. 2/3 mirror mount.

[11]

[9]

[8]

[10]

[6]

Figure 2-22

5) After fitting the shorter end [6] on the cable hook [12], secure its end with adhesive tape [13]. Be sure that the secured end of the cable is found where the hole in the left side plate and the tip of the cable matches.

[12][13]

[6]

Figure 2-23

2-13

+ 61 hidden pages

Canon PC800, PC900 Service Handbook

CONTENTS

CHAPTER 1 MAINTENANCE AND INSPECTION

A. Periodically Replaced Parts

B. Durables and Consumables

C. Scheduled Servicing

D. Storing and Handling the Cartridge

D-1. Storing the Cartridge with the Packaging Seal Intact

E. Image Adjustment Basic Procedure

F. Points to Note for Servicing

CHAPTER 2 STANDARDS AND ADJUSTMENTS

A. Mechanical