Canon Camcorder PC941 User Manual

REVISION 0

PC860

PC940

F13-8436

F13-8491

TYA00001-

TZA00001-

UAA00001-

TVD00001-

TVE00001-

PC880

F13-8291

PC941

F13-8437

PC890

F13-8242

PC950

F13-8231

F13-8241

TVF00001-

PUF00001-

PUG00001-

PC920

F13-8431

TVB00001-

PUD00001-

PUE00001-

PUH00001-

F13-8441

PC960

F13-8434

TVG00001-

TVH00001-

TVJ00001-

F13-8461

PC980

F13-8232

PC921

F13-8432

TVC00001-

PC981

F13-8233

FY8-13GA-000

AUG. 1999

1999 CANON INC.

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

INTRODUCTION

This service manual has been prepared for the PC800/900 Series machines,

providing basic information used for servicing the machines in the field so as to ensure

their quality and performance.

This service manual consists of the following chapters:

Chapter 1 General Description introduces the machine's features, specifications,

names of parts, and how originals are reproduced.

Chapter 2 Basic Operation explains how copies are made on a step-by-step basis.

Chapter 3 Exposure System discusses the principles of operation used for the

machine's exposure system. It also explains the timing at which exposure-

related mechanisms are operated, and shows how they may be

disassembled/assembled and adjusted.

Chapter 4 Image Formation System discusses the principles of operation used for the

machine's image formation system. It also explains the timing at which image

formation-related mechanisms are operated, and shows how they may be

disassembled/assembled and adjusted.

Chapter 5 Pick-Up/Feeding System discusses the principles of operation used for the

machine's pickup/feeding system. It also explains the timing at which pickup/

feeding-related mechanisms are operated, and shows how they may be

disassembled/assembled and adjusted.

Chapter 6 Fixing System discusses the principles of operation used for the machine's

fixing system. It also explains the timing at which fixing-related mechanisms

are operated, and shows how they may be disassembled/assembled and

adjusted.

Chapter 7 Externals/Auxiliary Mechanisms discusses the principles of operation used

for the machine's externals/auxiliary mechanisms. It also explains the timing

at which auxiliary mechanism-related mechanisms are operated, and shows

how they may be disassembled/assembled and adjusted.

Chapter 8 ADF explains the principles of operation of the ADF in view of electrical and

mechanical functions and in relation to their timing of operation. It also shows

how the unit may be disassembled/assembled and adjusted.

Chapter 9 Installation introduces requirements for the site of installation, and shows

how the machine may be installed using step-by-step instructions.

Chapter 10 Maintenance and Servicing provides tables of periodically replaced parts and

consumables/durables and scheduled servicing charts.

Chapter 11 Troubleshooting provides tables of maintenance/inspection, standards/

adjustments, and problem identification (image fault/malfunction).

Appendix contains a general timing chart and general circuit diagrams.

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

The following rules apply throughout this Service Manual:

1. Each chapter contains sections explaining the purpose of specific functions and the

relationship between electrical and mechanical systems with reference to the timing

of operation.

In the diagrams,

accompanies the symbol

nal.

represents the path of mechanical drive—where a signal name

, the arrow indicates the direction of the electric sig-

The expression “turn on the power” means flipping on the power switch, closing the

front door, and closing the delivery unit door, which results in supplying the machine

with power.

2. In the digital circuits, ‘1’ is used to indicate that the voltage level of a given signal is

“High,” while ‘0’ is used to indicate “Low.” (The voltage value, however, differs from

circuit to circuit.)

In practically all cases, the internal mechanisms of a microprocessor cannot be checked

in the field. Therefore, the operations of the microprocessors used in the machines

are not discussed: they are explained in terms of from sensors to the input of the DC

controller PCB and from the output of the DC controller PCB to the loads.

The descriptions in this Service Manual are subject to change without notice for

product improvement or other reasons, and major changes will be communicated in the

form of Service Information bulletins.

All service persons are expected to have a good understanding of the contents of this

Service Manual and all relevant Service Information bulletins and be able to identify and

isolate faults in the machine.

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

• This service manual 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

manual.

Model

Type Multi- Single Zoom Default Density

ADF

Cassette

Copying

speed

code feeder feeder

ratio

correction

switch

standard

(cpm) at

Direct

(SW101)

PC860

PC880

PC890

PC920

PC921

PC940

PC941

PC950

PC960

PC980

PC981

TYA

TZA

UAA

PUD

PUE

PUH

TVB

TVC

TVD

TVE

PUF

PUG

TVF

TVG

TVH

TVJ

√

2R2E

3R1E

2R2E

3R1E

√

250 sheets

Universal

500 sheets

Universal

500 sheets

√

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

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

iii

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CONTENTS

CHAPTER 1 GENERAL DESCRIPTION

I. FEATURES ..................................1-1

IV. USING THE MACHINE ............. 1-15

A. Control Panel...................... 1-15

V. ROUTINE MAINTENANCE

BY THE USER .......................... 1-17

VI. IMAGE FORMATION ................ 1-20

A. Outline ................................ 1-20

II. SPECIFICATIONS .......................1-2

A. Copier....................................1-2

B. ADF .......................................1-8

III. NAMES OF PARTS................... 1-10

A. External View ..................... 1-10

B. Cross Section..................... 1-13

CHAPTER 2 BASIC OPERATION

I. BASIC OPERATIONS ..................2-1

A. Functional Construction ........2-1

B. Outline of Electrical

D. Controlling the Main Motor

(M1) .......................................2-5

E. Inputs to and Outputs from

the DC Controller ..................2-7

Circuitry .................................2-2

C. Basic Sequence of

Operations.............................2-3

CHAPTER 3 EXPOSURE SYSTEM

I. OPERATIONS ..............................3-1

A. Outline ...................................3-1

B. Varying the Reproduction

A. Controlling the Scanning

Lamp .....................................3-9

III. DISASSEMBLY/ASSEMBLY ..... 3-12

A. Scanner Drive Assembly.... 3-13

B. Lens Drive Assembly ......... 3-31

C. Exposure System ............... 3-37

Ratio ......................................3-2

C. Lens Drive System ................3-3

D. Scanner Drive System ..........3-4

II. EXPOSURE SYSTEM .................3-9

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 4 IMAGE FORMATION SYSTEM

I. IMAGE FORMATION SYSTEM ...4-1

A. Outline ...................................4-1

B. Timing Chart for the Image

Formation System .................4-3

C. Controlling the Primary

F. Measuring the Density of

Originals ............................. 4-16

G. Controlling the Side Blanking

Mechanism ......................... 4-21

II. DISASSEMBLY/ASSEMBLY ..... 4-22

A. Cartridge ............................ 4-23

B. Transfer Charging

Charging Roller Bias .............4-4

D. Controlling the Transfer

Roller Bias .............................4-8

E. Controlling the Developing/

Separation Static Eliminator

Assembly............................ 4-25

C. Blank Exposure .................. 4-26

Bias .................................... 4-11

CHAPTER 5 PICK-UP/FEEDING SYSTEM

I. PICKUP/FEEDING SYSTEM.......5-1

A. Outline ...................................5-1

B. Controlling the Pickup

Roller .....................................5-3

C. Controlling the Movement of

Paper .....................................5-9

D. Detecting Jams .................. 5-12

II. DISASSEMBLY/ASSEMBLY ..... 5-18

A. Pickup Assembly ................ 5-19

B. Multifeeder Assembly ......... 5-28

C. Single-feeder Assembly ..... 5-31

D. Feeding Assembly.............. 5-33

E. Registration Roller

Assembly............................ 5-34

F. Delivery Assembly.............. 5-36

CHAPTER 6 FIXING SYSTEM

I. OPERATIONS ..............................6-1

A. Outline ...................................6-1

B. Controlling the Fixing

II. DISASSEMBLY/ASSEMBLY ..... 6-10

A. Fixing Assembly ................. 6-11

Temperature ..........................6-3

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS

I. FANS ............................................7-1

II. POWER SUPPLY SYSTEM .........7-3

A. Outline of the Power Supply

System ..................................7-3

B. Power Supply Circuit .............7-4

C. Detecting an Error on

III. DISASSEMBLY/ASSEMBLY ........7-7

A. External Covers.....................7-8

B. Control Panel...................... 7-15

C. Copyboard Glass ............... 7-16

D. Main Motor/Main Drive

Assembly............................ 7-17

E. Electrical System ............... 7-21

the Composite Power Supply

PCB .......................................7-6

D. Protecting the Power Supply

Circuit ....................................7-6

CHAPTER 8 ADF

I. ADF ..............................................8-1

A. Outline ...................................8-1

H. Controlling the Belt Motor .. 8-15

I. Detecting Original Jams ..... 8-16

J. Power Supply ..................... 8-17

II. DISASSEMBLY/ASSEMBLY ..... 8-18

A. Removing the ADF............. 8-19

B. External Covers.................. 8-21

C. Drive System ...................... 8-23

D. Feeding System ................. 8-26

E. Electrical System ............... 8-33

Basic Construction ................8-2

C. Basic Operations...................8-4

D. Detecting an Original ............8-6

E. Pickup Operation...................8-8

F. Delivery .............................. 8-12

G. Controlling the Pickup

Motor .................................. 8-14

CHAPTER 9 INSTALLATION

I. SELECTING A SITE ....................9-1

II. UNPACKING AND

B. Placing Copy Paper...............9-9

III. MOVING THE MACHINE .......... 9-12

INSTALLATION ............................9-2

A. Unpacking and Installation....9-2

CHAPTER 10 MAINTENANCE AND SERVICING

I. PERIODICALLY REPLACED

PARTS....................................... 10-1

II. DURABLES AND

CONSUMABLES ...................... 10-1

III. SCHEDULED SERVICING ....... 10-1

IV. STORING AND HANDLING

THE CARTRIDGE..................... 10-2

A. Storing the Cartridge with the

Packaging Seal Intact ........ 10-2

B. Storing and Handling the

Cartridge with the Packaging

Seal Removed.................... 10-3

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

vii

CHAPTER 11 TROUBLESHOOTING

I. MAINTENANCE AND

A. Troubleshooting

INSPECTION ............................ 11-3

A. Image Adjustment Basic

Procedure........................... 11-3

B. Points to Note for

Malfunctions ..................... 11-61

V. TROUBLESHOOTING FEEDING

PROBLEMS ............................ 11-75

A. Copy Paper Jam............... 11-75

B. Faulty Feeding.................. 11-78

VI. ARRANGEMENT AND

Servicing ............................ 11-4

II. STANDARDS AND

ADJUSTMENTS ....................... 11-5

A. Mechanical ......................... 11-5

B. ADF .................................. 11-30

C. Electrical........................... 11-41

III. TROUBLESHOOTING IMAGE

FAULTS ................................... 11-48

A. Making Initial Checks ....... 11-48

B. Sample Image Faults ....... 11-52

C. Troubleshooting Image

FUNCTIONS OF ELECTRICAL

PARTS..................................... 11-79

A. Sensors and Solenoids .... 11-79

B. Switches ........................... 11-80

C. Lamp, Heater, Motor, Etc. 11-81

D. PCBs ................................ 11-82

E. ADF .................................. 11-83

F. Variable Resistors (VR) and

Check Pins by PCB .......... 11-84

VII. SELF DIAGNOSIS .................. 11-86

Faults................................ 11-53

IV. TROUBLESHOOTING

MALFUNCTIONS.................... 11-61

APPENDIX

A. GENERAL TIMING CHART ........ A-1

B. SIGNALS AND

ABBREVIATIONS ....................... A-3

C. GENERAL CIRCUIT

DIAGRAM ................................... A-5

D. DC CONTROLLER CIRCUIT

DIAGRAM ................................... A-7

E. ADF CONTROLLER CIRCUIT

DIAGRAM ................................. A-15

F. COMPOSITE POWER SUPPLY

CIRCUIT DIAGRAM.................. A-19

G. CONTROL PANEL CIRCUIT

DIAGRAM ................................. A-27

H. AE SENSOR CIRCUIT

I. SENSOR CIRCUIT

DIAGRAM ................................. A-30

J. NOISE FILTER CIRCUIT

DIAGRAM ................................. A-31

K. HIGH VOLTAGE CONTACT

CIRCUIT DIAGRAM.................. A-32

L. BLANK EXPOSURE (front)

CIRCUIT DIAGRAM.................. A-33

M. BLANK EXPOSURE (rear)

CIRCUIT DIAGRAM.................. A-34

N. SPECIAL TOOLS ...................... A-35

O. SOLVENTS/OILS ...................... A-36

DIAGRAM ................................. A-29

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

viii

CHAPTER 1

GENERAL DESCRIPTION

This chapter provides specifications of the machine, instructions on how to operate

the machine, and an outline of copying process.

I. FEATURES ..................................1-1

II. SPECIFICATIONS .......................1-2

A. Copier....................................1-2

B. ADF .......................................1-8

III. NAMES OF PARTS................... 1-10

A. External View ..................... 1-10

B. Cross Section..................... 1-13

IV. USING THE MACHINE ............. 1-15

A. Control Panel...................... 1-15

V. ROUTINE MAINTENANCE

BY THE USER .......................... 1-17

VI. IMAGE FORMATION ................ 1-20

A. Outline ................................ 1-20

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 1 GENERAL DESCRIPTION

I. FEATURES

1. Personal Copier with a Zoom Function and a Fixed Copyboard

• You can choose either a default enlargement/reduction ratio or any ratio between 70% and

141% in 1% increments.

2. Ecology-Conscious

• The use of a roller charging method has resulted in a considerable reduction of ozone: 0.01

ppm or less on the average, 0.02 ppm or less at maximum (1/100 to 1/1000 compared with

existing Canon machines).

3. SURF Fixing Assembly

• The wait time is 0 sec (at 20°C room temperature), enabling speedy copying work immedi-

ately after power-on.

4. Various Paper Sizes

• The paper may be between A4 (LGL) and A5 (STMT) (*Using the universal cassette).

• In manual feed mode, paper may be as large as A4 (LGL) or as small as a business card.

5. All-in-One Cartridge for Simple Maintenance

• The photosensitive drum, toner case, charging roller, developing assembly, and cleaning as-

sembly are constructed as a single entity (cartridge).

The user may expect quality copy images at all times as long as he/she performs simple

replacement/cleaning work.

6. Large Paper Source

• The source of paper may contain as many as 550 sheets of paper (500-sheet cassette +

multifeeder; multifeeder type).

7. Separate top unit

• The machine’s top unit may be opened to make jam removal easy.

8. ADF Type

• Continuous copying is possible with the use of the ADF.

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

1-1

CHAPTER 1 GENERAL DESCRIPTION

II. SPECIFICATIONS

A. Copier

1. Type

Item

Descriptions

Body

Desk top

Fixed

Copyboard

Source of light

Halogen lamp (80 V/110 W for 120V-model; 150 V/160 W

for 220/240 V-model)

Lens

Fixed focal point lens

OPC drum (24-mm dia.)

Table 1-201

Photosensitive medium

2. Mechanisms

Item

Descriptions

Reproduction

Indirect static reproduction

Charging

Roller (direct charging)

Slit (moving light source)

Auto or manual

Exposure

Copy density adjustment

Development

Pickup

Dry (toner projection)

Cassette (1 pc.)

Single-feeder (single-feeder type)

Multifeeder (multifeeder type)

Separation

Fixing

Curvature separation + static eliminator

Flat heater

Cleaning

Blade

Original orientation

Center reference (copyboard)

Table 1-202

1-2

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 1 GENERAL DESCRIPTION

3. Performance

Item

Descriptions

Original type

Sheet, book, 3-D object (2kg max.)

Maximum original size

Reproduction ratio

Zoom

A4 (297 × 210 mm)/LGL (216 × 356 mm)

Inch/AB-configuration: 2R2E Inch-configuration: 3R1E

70% to 141% (in 1% increments^*1)

Wait time

0 sec (at 20°C room temperature)

First copy time

10 sec or less (at 20°C room temperature; Direct, non-AE,

from the cassette)

Continuous copying

Copy size

100 (max.)

A4/LGL (297 × 210 mm/216 × 356 mm max.)

Business card (90 × 55 mm, min.)

Copy paper type

Cassette:

Plain paper (64 to 80 g/m²), tracing paper (SM-1, A4R/

B5R), colored paper, recycled paper (64 to 80 g/m²; A4R/

B5R), eco paper (80 g/m²; A4R)

Manual Feeder:

Plain paper (52 to 128 g/m²), tracing paper (SM-1, GNT-

80^*2; A4R/B5R), transparency^*2,*4(A4R/LTRR^*3), colored

paper, business card (200 g/m²or less), label sheet^*2(A4R/

LTRR), recycled paper (64 to 80 g/m²; A4R/B5R), eco pa-

per (80 g/m²; A4R), postcard^*3

Double-Sided/Overlay Copying^*5:

Plain paper (64 to 128 g/m²), colored paper, business card

(200 g/m²or less), recycled paper (64 to 80 g/m²; A4R/

B5R), eco paper (80 g/m²; A4R), postcard^*3

Cassette

With claws

Universal cassette (250 sheets of 80 g/m²paper; A4/LGL to

A5/STMT)

250-sheet cassette (250 sheets of 80 g/m²)

500-sheet cassette (500 sheets of 80 g/m²)

5 mm deep (approx.; 50 sheets of 80 g/m²)

100 sheets (A4; 80 g/m²)

Multifeeder tray

Copy tray

Non-image width

Leading edge: 2.0 ±1.5 mm (Direct; 4.0 mm or less otherwise)

Left/right: 0.0 +2.0, -0.0 mm (0 +4.0, -0.0 mm for LTR)

Provided (5 min, approx.; fixed)^*6

Auto power-off

Table 1-203

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

1-3

CHAPTER 1 GENERAL DESCRIPTION

*1. Applies only to models with a zoom function.

*2. Applies only to single pickup if the multifeeder is used.

*3. Applies only to vertical feeding.

*4. Upon delivery, be sure to remove each from the copy tray.

*5. Be sure to remove any curling before feeding for a second time.

*6. If stopped because paper ran out during copying operation, 1 hr.

1-4

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 1 GENERAL DESCRIPTION

4. Others

Item

Descriptions

Operating condition

Temperature

7.5°C to 32.5°C/44.5°F to 90.5°F

Humidity

5% to 85% RH

Atmospheric pressure

607.95 to 1013.25 hPa (0.6 to 1 atm)

Power source

Serial number

120 V 60 Hz 220/240 V 50 Hz, 60 Hz

TVBxxxxx PUDxxxxx PUHxxxxx

TVCxxxxx PUExxxxx

TVDxxxxx PUFxxxxx

TVExxxxx PUGxxxxx

TVFxxxxx

TYAxxxxx

TVGxxxxx TZAxxxxx

TVHxxxxx UAAxxxxx

TVJxxxxx

Maximum power consumption

Noise

0.9 kW or less

Standby: 1.2W (approx.; about 5min; reference only)

Copying: 0.4kWh (approx.; reference only)

Standby: -(sound power level by ISO)

Copying: (sound power level by ISO)

• Single-feeder type: 68 dB or less

• Multifeeder type: 66 dB or less

Ozone

0.01 ppm or less (average; 0.02 ppm or less, max.)

Dimensions (WxDxH)

Copyboard Type

484.9 × 448.2 × 297.5 mm^*1/ 329.0 mm^*2

19.1 in. × 17.6 in × 11.7 in^*1/ 13.0 in^*2

ADF Type

484.9 × 448.2 × 358.3 mm^*1/ 389.8 mm^*2

19.1 in × 17.6 in × 14.1 in^*1/ 15.3 in^*2

Weight (including the cassette)

Copyboard Type

Single-feeder type: 19.3 kg^*1/ 42.5 lb^*1, 20.9 kg^*2/ 46.0 lb^*2

Multifeeder type: 19.5 kg^*1/ 42.9 lb^*1, 21.1 kg^*2/ 46.4 lb^*2

ADF Type

Single-feeder type: 23.8 kg^*1/ 52.4 lb^*1, 25.2 kg^*2/ 55.4 lb^*2

Multifeeder type: 24.0 kg^*1/ 52.8 lb^*1, 25.4 kg^*2/ 55.9 lb^*2

Consumables

Copy paper: Keep wrapped, and protect against humidity.

Toner: Avoid direct sunlight, and store at 40°C/104°F, 85%

or less.

Table 1-204

*1. 250-sheet cassette type

*2. 500-sheet cassette type

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

1-5

CHAPTER 1 GENERAL DESCRIPTION

5. Default Ratios

Item

2R2E (Inch/AB-configuration)

3R1E (Inch-configuration)

Direct

1:1.000

Reduce I

Reduce II

Reduce III

Reduce IV

Enlarge I

Enlarge II

1:0.707

1:0.786

1:0816

1:0.860

1:1.414

1:1.154

1:1.414

Table 1-205

1-6

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 1 GENERAL DESCRIPTION

6. Copying Speed

Copying speed

at Direct

Reproduction ratio

Copy size

Number of copies

( Multifeeder^*1)

(Copies / min)

13 (9)

Direct

LTRR

LGL

STMTR

MIN

11 (8)

13 (9)

10 (9)

12 (9)

10 (9)

Reduce I (70.7%)

Reduce II (78.6%)

Reduce IV (86.0%)

Enlarge II (141.4%)

Direct

LGL → LTRR

MARJIN

MAX

A4R

B5R

A5R

Reduce I (70.7%)

Reduce III (81.6%)

Enlarge I (115.4%)

Enlarge II (141.4%)

Direct

A4R → A5R

B5R → A5R

B5R → A4R

A5R→ A4R

A4R

B5R

A5R

Reduce I (70.7%)

Reduce III (81.6%)

Enlarge I (115.4%)

Enlarge II (141.4%)

Direct

A4R → A5R

B5R → A5R

B5R → A4R

A5R → A4R

LTRR

10 (9)

10 m(9)

10 (9)

LGL

STMTR

MIN

LGL → LTRR

MARJIN

MAX

10 (9)

Reduce I (70.7%)

Reduce II (78.6%)

Reduce III (86.0%)

Enlarge II (141.4%)

Table 1-206

*1. The number of copies starting with the pickup operation that follows the delivery of the

19th copy in a continuous copying job. (See p.5-8)

The specifications are subject to change for product improvement.

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

1-7

CHAPTER 1 GENERAL DESCRIPTION

B. ADF

Item

Descriptions

Original pickup

Auto pickup/delivery

Face-down

Original orientation

Original position

Original separation

Original type

Center reference

Top separation

Single-sided (50 to 128 g/m²)

A5 (STMT) to A4R (LTRR), LGL

Length: 139.7 to 355.6 mm (feeding direction)

Width: 139.7 to 215.9 mm

Stack

30 sheets (80 g/m²or less; about 3 mm in height)

Original processing mode

Original size detection

Mixed original sizes

Original detection

Original feeding speed

Communication with host

Dimensions

Single-sided original to single-sided copy

Yes (in feeding direction)

Yes

446 mm/sec

IPC

Width: 474 mm/ 18.7 in.

(659 mm/ 25.9 in. with the tray open)

Depth: 394 mm/ 15.5 in.

Height: 74 mm/ 2.9 in. (216 mm/ 8.5 in. with the tray open)

Weight

5 kg/ 11 lb (approx.)

Power source

24 VDC and 5 VDC (from the host)

40 W or less

Maximum power consumption

Operating environment

Temperature: same as the host

Humidity:

same as the host

Table 1-207

1-8

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 1 GENERAL DESCRIPTION

*1. The following may not be used as an original:

• Sheet with a staple, clip, or glue.

• Sheet with a cut, hole, or tear.

• Sheet with holes for binding.

• Sheet with a carbon back.

• Sheet with a cut-and-paste piece.

• Sheet with curling, bending, or wrinkling.

The specifications are subject to change for product improvement.

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

1-9

CHAPTER 1 GENERAL DESCRIPTION

III. NAMES OF PARTS

A. External View

[1]

1. Copyboard Type

[2]

[6]

[3]

[5]

[4]

[1] Copyboard cover

[2] Static eliminator cleaner

[3] Manual feed tray

[4] Right door

[5] Cassette

[6] Copyboard glass

Figure 1-301

[4]

[3]

[5]

[2]

[1]

[6]

[1] Copy tray

[4] Static eliminator

[2] Power cord connector

[3] Open/close lever

[5] Copy density correction switch

[6] Delivery guide plate

Figure 1-302

1-10

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 1 GENERAL DESCRIPTION

2. ADF Type

[1]

[5]

[2]

[4]

[3]

[1] ADF

[4] Cassette

[2] Manual feed tray

[3] Right door

[5] Copyboard glass

Figure 1-303

[6]

[5]

[7]

[4]

[3]

[2]

[1]

[1] Static eliminator cleaner

[2] Delivery guide plate

[3] Copy tray

[5] Open/close lever

[6] Static eliminator

[7] Copy density correction switch

[4] Power cord connector

Figure 1-304

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

1-11

CHAPTER 1 GENERAL DESCRIPTION

3. ADF

[3]

[4]

[2]

[1]

[1] Original tray

[3] Slide guide

[2] Original delivery tray

[4] Auxiliary tray

Figure 1-305

1-12

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 1 GENERAL DESCRIPTION

B. Cross Section

1. Body

[1] [2] [3] [4] [5]

[6]

[7]

[8] [9] [10] [11] [12] [13]

[14]

[28] [27] [26] [25] [24]

[23] [22] [21] [20] [19] [18] [17] [16] [15]

[29]

[1] No. 3 mirror

[11] Cartridge

[21] Transfer roller

[22] Feed belt

[23] Cassette

[24] Fixing upper unit

[25] Fixing lower roller

[2] No. 2 mirror

[3] No. 1 mirror

[4] Scanning lamp

[5] Heat exhaust fan

[6] Copyboard glass

[7] Side blanking lamp

[8] Lens

[12] No. 4 mirror

[13] No. 5 mirror

[14] Multifeeder tray

[15] Vertical path roller

[16] Multifeeder pickup roller [26] Cleaning roller

[17] Cassette pickup roller

[18] Registration roller

[27] Delivery roller

[28] Copy tray

[9] Primary charging roller [19] Developing cylinder

[29] Single-feeder pickup roller

[10] No. 6 mirror

[20] Photosensitive drum

Figure 1-306

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

1-13

CHAPTER 1 GENERAL DESCRIPTION

2. ADF

[1]

[2]

[3]

[4]

[5]

[6]

[13]

[12]

[11]

[10] [9] [8] [7]

[1] Delivery roller

[2] Copy tray

[8] Separation pad

[9] Registration roller

[3] Pickup roller 2

[4] Pickup roller 1

[5] Copyboard tray

[6] Auxiliary tray

[7] Guide plate

[10] Feed belt drive roller

[11] Feed belt

[12] Feed belt roller

[13] Feed belt link slave roller

Figure 1-307

1-14

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 1 GENERAL DESCRIPTION

IV. USING THE MACHINE

A. Control Panel

[1]

[2]

[3]

[4] [5] [6]

[7]

[8]

[9]

[15]

[14]

[13]

[12] [11]

[10]

Figure 1-401

No.

Name

Copy density adjusting lever

Description

Adjusts the density of copies

manually.

Remarks

Copy density mode indicator

Default ratio indicator

Indicates the selected copy den-

sity mode.

Indicates the selected default ra-

tio.

Paper selection indicator^*1

Indicates the selected cassette/

manual feed tray.If there is no

paper loaded, it flashes.

Jam indicator

Flashes in response to a jam.

Count/ratio indicator

• Indicates the number of copies 100 (max.; continuous

or reproduction ratio.

• The symbol “%” turns on

when indicating a ratio.

copying)

Clear/stop key

Stops copying or returns copy-

ing mode to standard mode.

Standard Mode

Ratio: 100%

Count: 1

Paper source: cassette

Copy density: auto

mode

Copy start key

Power switch

Starts copying.

Turns on and off the power.

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

1-15

CHAPTER 1 GENERAL DESCRIPTION

No.

Name

Count/zoom set key

Description

Sets the number of copies or a

zoom ratio.

Remarks

Zoom indicator^*2

Zoom key^*2

Turns on when zoom mode is

selected.

Selects/deselects zoom mode.

May be between 70%

and 141% in 1% incre-

ments.

Paper selection key^*1

Default ratio key

Selects the cassette/ manual

feed tray.

Selects a default reproduction

ratio.

Copy density mode selection

key

Selects copying density mode.

Table 1-401

*1. Applies only to a multifeeder model.

*2. Applies only to a model equipped with a zoom function.

1-16

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 1 GENERAL DESCRIPTION

V. ROUTINE MAINTENANCE BY THE USER

Instruct the user to clean the following if images tend to be soiled or copy paper tends to jam

often.

1. Soiled Images

a. Copyboard Glass/Copyboard Cover

Clean the cover with a moist cloth (with water or mild detergent solution); then, dry wipe it.

b. Feeding Belt (ADF type)

b.1 Cleaning in Feeder Cleaning Mode

1) Turn on the machine, and hold down the Copy Density Mode Selection key for 4 sec or

more.

• The count/ratio indicator will indicate ‘U6’.

Zoom

Figure 1-501

2) Place about 10 sheets of blank copy paper (A4/LTR) on the original tray of the ADF.

3) Press the Copy Start key.

• Copy paper will be fed from the original tray.

• The indicator flashes ‘U6’ while the feeder is being cleaned.

4) Press the Copy Density Mode Selection key to end the mode.

Caution:

• You cannot start feeder cleaning mode while the machine is making copies or if an error

exists.

• The auto power-off mechanism does not operate while feeder cleaning mode is being

executed.

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

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CHAPTER 1 GENERAL DESCRIPTION

b.2 Cleaning by Hand

1) Wipe the feed belt with a moist cloth (water or mild detergent solution) in the direction of

the arrow in the figure; then, dry wipe it.

Figure 1-502

2. If Jams Occur Frequently

a. Static Eliminator

1) Remove the static eliminator cleaner from the machine.

Figure 1-503 (Copyboard type)

1-18

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 1 GENERAL DESCRIPTION

Figure 1-504 (ADF type)

2) Pull the open/close lever to open the machine.

3) Using the static eliminator cleaner, clean the static eliminator.

• Brush out the paper lint or the like from the groove of the static eliminator.

Figure 1-505

4) Close the machine as soon as you have finished cleaning. (Work briskly.)

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

1-19

CHAPTER 1 GENERAL DESCRIPTION

VI. IMAGE FORMATION

A. Outline

The construction of the machine is as follows:

Copyboard glass

Scanning lamp

Fixed focal point lens

Side blanking lamp

(front, rear)

Primary charging roller

Developing blade

Cleaning blade

Developing cylinder

Fixing assembly

Photosensitive drum

Transfer charging roller

Static eliminator

Figure 1-601

1-20

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 1 GENERAL DESCRIPTION

The machine’s image formation process consists of the following seven steps:

Step 1

Step 2

Step 3

Step 4

Step 5

Step 6

Step 7

Primary charging (AC + negative DC)

Image exposure

Development (AC + negative DC)

Transfer (negative DC)

Separation (curvature separation + static eliminator; positive DC)

Fixing

Drum cleaning

Static latent image formation block

1. Primary charging

7. Drum cleaning

2. Image exposure

3. Development

4. Transfer

Manual feed

Registration

6. Fixing

5. Separation

Delivery

Cassette

: Flow of copy paper

: Rotation of the photosensitive drum

Figure 1-602

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

1-21

CHAPTER 2

BASIC OPERATION

This chapter provides descriptions on basic operations, functions of each operation,

relationships between electrical and mechanical systems, and timing at which each

associated part is turned on.

Process speed

96 mm/sec

I. BASIC OPERATIONS ..................2-1

A. Functional Construction ........2-1

B. Outline of Electrical

D. Controlling the Main Motor

(M1) .......................................2-5

E. Inputs to and Outputs from

the DC Controller ..................2-7

Circuitry .................................2-2

C. Basic Sequence of

Operations.............................2-3

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 2 BASIC OPERATION

I. BASIC OPERATIONS

A. Functional Construction

The machine consists of four functional blocks: pickup/feeding system, exposure system, im-

age formation system, and control system.

Control system

Control panel

Exposure system

Copyboard

Original

illuminating block

Control circuit

Optical block

Image formation

system

Primary charging

roller

Photosensitive

drum

Drum

cleaning block

Developing

assembly

Transfer/

separation

Pickup

control block

Feeding

Copy tray

Fixing assembly/

delivery assembly

Pickup/

feeding system

Cassette

Figure 2-101

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

2-1

CHAPTER 2 BASIC OPERATION

B. Outline of Electrical Circuitry

The machine’s major electric mechanisms are controlled by the microprocessor mounted on

the DC controller PCB, which reads input signals from sensors and operating keys according to the

instructions of the program stored in advance and sends signals used to drive motors, solenoids,

lamps, and other loads as needed.

Sensor

<Loads>

Composite

DC controller PCB

power supply PCB

Scanning lamp

Fixing heater

Q900

CPU

Q101

CPU

+5V

• Scanner home position detection

• Lens home position detection

• Pre-registration roller paper

detection

+24V

• Delivery paper detection

• Vertical path roller paper detection

• Single-feeder paper detection

• Primary charging roller

High-

voltage

circuit

block

• Developing cylinder

• Transfer charging roller

• Static eliminator

Contact

PCB

AE sensor

PCB

Main motor

driver PCB

Main

motor

Thermistor

• Pickup clutch solenoid

• Registration clutch solenoid

• Lens solenoid

• Scanner thermistor

• Fixing thermistor

Solenoid

• Multifeeder pickup solenoid

• Cassette pickup solenoid

Control

panel

Side blanking

lamp

Scanner/

lens drive motor

Power

switch

Scanner cooling fan

Sensor/

switch

ADF

ADF load

Figure 2-102

2-2

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 2 BASIC OPERATION

C. Basic Sequence of Operations

• A4R, Direct, 2 Copies, Continuous, Cassette

Power switch Copy Start key

ON ON

STBY INTR AER

SCFW

SCRV

SCFW

SCRV LSTR STBY

0.3sec (approx.)

Main motor (M1)

Scanning lamp (LA1)

Scanner

Forward Reverse

I II

Primary AC bias

Primary DC bias

Developing AC bias

Developing DC bias

Transfer bias

Static eliminator bias

Fixing heater (H1)

I : Scanner home position detection

II: Lens home position detection

Figure 2-103

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

2-3

CHAPTER 2 BASIC OPERATION

Period

Description

STBY

(standby)

• From when he power switch is turned Waits until the Copy Start key is

on to when the Copy Start key is pressed.

pressed.

• From when LSTR ends to when the

Copy Start key is pressed.

INTR

(initial rotation)

From when the Copy Start key is Removes residual charges from the

pressed to when the scanner moves for- photosensitive drum, thereby ensuring

ward.

a stable drum sensitivity.

AER

(AE rotation)

While the scanner moves forward about Measures the density of the original.

10 cm and then moves it in reverse.

SCFW

While the scanner is moving forward.

Illuminates the original by the scanning

(scanner forward)

• The distance varies according to the lamp, and the reflected optical image is

selected copy size and reproduction projected to the photosensitive drum

ratio.

through mirrors and lenses.

• The forward speed varies according to

the selected reproduction ratio.

SCRV

(scanner reverse)

While the scanner is moving in reverse. Moves the scanner to the home position

• The reverse speed is about 3.3 as fast in preparation for the next copying run.

as the forward speed used in Direct.

Neutralizes the drum surface potential

LSTR

(last rotation)

From when SCRV ends to when the as post-processing.

main motor stops.

Table 2-101

2-4

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 2 BASIC OPERATION

D. Controlling the Main Motor (M1)

1. Outline

Table 2-102 shows the functions of the main motor control circuit, and Figure 2-104 is a block

diagram of the circuit.

Item

Power supply

Description

24 VDC from the composite power supply.

Drive signal

Signal (MMD) from the DC controller PCB.

Moving/drive parts

Photosensitive drum, primary charging roller, developing assembly,

transfer charging roller, pickup roller, vertical roller, registration roller,

feeding assembly, fixing assembly, delivery roller, heat exhaust fan

Control

Executes on/off control.

Executes constant speed rotation control.

Error detection

Issues ‘E010’.

Table 2-102

+24V

J205

-4

J901

24V -1

Clock pulse

generator

Phase

control

drive

controller

PCB

Drive

current

-3

-2

GND -2

MMD -3

Main motor

(M1)

circuit

J203

-3

J103

-6

J104 J204

Hall IC output

MMCLK

-1

-7

-1 MLOCK -4

Composite

power

supply

PCB

Reference signal

Main motor drive PCB

Figure 2-104

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

2-5

CHAPTER 2 BASIC OPERATION

2. Operations

The main motor (M1) is a DC motor with a built-in clock pulse generator, which generates

clock pulses (MMCLK) in relation to the rotation of the motor while the motor is rotating.

The speed control circuit controls the main motor (M1) so that it rotates at a specific speed by

matching the frequency of these clock pulses and that of the reference signals.

When the main motor drive signal (MMD) from the DC controller circuit goes ‘1’, the motor

diver drive circuit turns on, causing the main motor (M1) to rotate at a specific speed.

While the main motor is rotating at a specific speed, the main motor driver PCB keeps sending

the constant speed state signal (MLOCK=0) to the DC controller PCB. If the rotation of the motor

starts to have fluctuations, the MLOCK signal goes ‘1’.

Related Error Code

E010

While the main motor drive signal is generated, the rotation of the main motor deviates from

a specific number for 1 sec or more.

a. Turning On/Off the Main Motor

When the main motor drive signal (MMD) from the DC controller circuit goes ‘1’, the main motor

driver turns on to rotate the main motor (M1).

b. Rotating the Main Motor at a Constant Speed

The drive circuit on the motor driver PCB controls the main motor so that the phase of the fre-

quency of the clock pulse signals (MMCLK) occurring when the motor rotates and that of the

frequency of the reference signals match. The main motor driver PCB sends the constant speed

state signal (MLOCK=0) to the DC controller circuit.

c. Detecting an Error (E010)

If the rotation of the main motor starts to have fluctuations for some reason, the MLOCK signal

goes ‘1’. If the signal remains ‘1’ for about 1 sec, the DC controller will find the condition to be a

fault in the main motor, and will stop the main motor and, at the same time, indicate ‘E010’ in the

display.

2-6

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 2 BASIC OPERATION

E. Inputs to and Outputs from the DC Controller

1. Inputs to the DC Control (1/2)

DC controller PCB

+5V

J101-1

Scanner home

position sensor

When the scanner is in the home position, ‘1’.

(The light-blocking plate is at PS1, ‘1’.)

-3

-2

SCHP

PS1

PS2

PS3

PS4

+5V

LHP

J109-11

Lens home

position sensor

When the lens is in the home position, ‘1’.

(The light-blocking plate is at PS2, ‘1’.)

-10

-9

J62

J102-7

DIG3

DPD

When PS3 has detected paper, ‘0’.

(The light-blocking plate is at PS3, ‘1’.)

-9

-8

Delivery sensor

+5V

J132-3

Vertical path roller

paper sensor

When PS4 has detected paper, ‘1’.

(The light-blocking plate is at PS4, ‘1’.)

-5

-4

PDP

J113-1

DIG2

SFPD

Single-feeder

When PS5 has detected paper, ‘0’.

-3

-2

paper sensor

(Single-feeder type only)

(The light-blocking plate is at PS5, ‘1’.)

PS5

+5V

J108-4

When Q751 has detected paper, ‘1’.

(The light-blocking plate is at PS751, ‘0’.)

Pre-registration

roller paper sensor

-3

-5

RPD

Q751

Sensor PCB

J433 J62

TH1

TH2

J102-1

-6

When the surface temperature of the fixing

heater increases, the voltage decreases.

(analog signal)

TH1

TH2

Fixing thermistor

J131-1

-2

When the temperature of the scanner increases,

the voltage decreases. (analog signal)

Scanner thermistor

Figure 2-105

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

2-7

CHAPTER 2 BASIC OPERATION

2. Inputs to the DC Controller (2/2)

DC controller PCB

+24V

J601

J107-4

+24V

-3

-2

-1

AEREF

When the light reflected by the original increases,

the voltage increases.

AE sensor PCB

The keys and the LEDs are wired in a matrix

in the control panel PCB, and the DC controller

turns on or flashes the LEDs and reads key inputs.

J301 J111

J111-15

Control panel

PCB

PWOFF

J111-16

SW309

J62

J102-2

DIG1

HEAT0

The variation in the resistance of the fixing heater

is corrected in three levels based on combinations

of 2-bit signals.

-3

-4

-5

DIG1

HEAT1

Figure 2-106

2-8

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 2 BASIC OPERATION

3. Outputs from the DC Controller (1/2)

Composite power supply PCB

DC controller PCB

Line filter

J201-2

LF1

NF1

(220/240V model only)

-1

DS1

Noise filter

Door switch

Fixing heater

J16

J434

Transformer

J207-1

-2

FU2

Thermal fuse 2

J104-2

Fixing heater

activation circuit

HEAT_TRG When ‘0’,

the fixing heater

turns on.

Scanning lamp

LA1

J910-3

-1

FU1

Scanning lamp

activation circuit

Thermal fuse 1

Primary charging roller

Developing cylinder

Transfer charging roller

Static eliminator

High-

Micro-

processor

voltage

circuit

block

Communication with

the composite power

supply

HVT board

+24V

J103-6

J104-1

MMD

See p. 2-5.

MLOCK

Main

motor

Main motor

driver PCB

See p. 3-7.

Scanner/

lens drive motor

Figure 2-107

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

2-9

CHAPTER 2 BASIC OPERATION

4. Outputs from the DC Control PCB (2/2)

DC controller PCB

+24V

J53 J51

J109-4

When ‘0’, the pickup clutch solenoid

turns on.

SL1

Pickup clutch solenoid

-3

PUSLD*

+24V

J54

J109-6

-5

When ‘0’, the registration clutch

solenoid turns on.

Registration clutch solenoid

SL2

SL3

SL4

RGSLD*

+24V

J52

J109-2

-1

When ‘0’, the lens solenoid turns on.

Lens solenoid

LNSLD*

+24V

J55 J51

J109-8

-7

When ‘0’, the multifeeder pickup

solenoid turns on.

Multifeeder pickup solenoid

(Multifeeder type only)

MFSLD*

+24V

J58

J132-2

-1

When ‘0’, the cassette pickup solenoid

turns on.

Cassette pickup solenoid

Scanner cooling fan

SL5

CPUSD*

+24V

J130-1

-2

When ‘0’, the scanner cooling fan

turns on.

FM1

FM1D*

J106-1

SB_LP*

Side blanking lamp (rear)

Side blanking lamp (front)

When ‘0’, the blanking lamp turns on.

+24V

-2

Figure 2-108

2-10

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 2 BASIC OPERATION

5. Inputs to and Outputs from the ADF

DC controller PCB

J60

-8

-7

-6

-5

-4

-3

-2

-1

J114-1

REQ

ACK

TXD

RXD

-2

-3

-4

-5

-6

-7

-8

To the ADF

See Chapter 8.

J24

-4

-3

-2

-1

To the ADF

J202-1

-2

J105-6

-5

+24V

+5V

-3

-4

-3

+5V

-5

-2

-6

-1

+24V

Composite power supply PCB

Figure 2-109

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

2-11

CHAPTER 3

EXPOSURE SYSTEM

This chapter discusses the principles of operation used for the machine's lens drive

unit and scanner drive unit. It also explains the timing at which these drive units are

operated, and shows how they may be disassembled/assmbled and adjusted.

I. OPERATIONS ..............................3-1

A. Outline ...................................3-1

B. Varying the Reproduction

A. Controlling the Scanning

Lamp .....................................3-9

III. DISASSEMBLY/ASSEMBLY ..... 3-12

A. Scanner Drive Assembly.... 3-13

B. Lens Drive Assembly ......... 3-31

C. Exposure System ............... 3-37

Ratio ......................................3-2

C. Lens Drive System ................3-3

D. Scanner Drive System ..........3-4

II. EXPOSURE SYSTEM .................3-9

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 3 EXPOSURE SYSTEM

I. OPERATIONS

A. Outline

Table 3-101 shows the major functions of the exposure system.

Item

Description

Lamp

Halogen

Scanning

By moving the No. 1 mirror mount

Scanner position detection

Ratio variation

By a sensor (scanner home position sensor; PS1)

Main scanning direction:by varying the optical length

Sub scanning direction:by varying the speed of the No. 1 mirror mount

Lens drive control

Scanner/lens drive motor (M2)

Fixed focal point lens unit

Mobile No. 4/5 mirror unit

Scanner drive control

Protective function

Scanner/lens drive motor (M2)

Scanner thermistor (TH2)

By a fuse (blows in response to overheating of the scanning lamp to cut

power to the lamp)

• Thermal fuse (FU1; blows at 128°C)

Table 3-101

Copyboard glass

Moves for enlargement/

Enlarge Reduce

reduction

Fixed focal point lens

No. 4/5 mirror unit

Photosensitive

drum

Figure 3-101

1999 CANON INC.

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

3-1

CHAPTER 3 EXPOSURE SYSTEM

B. Varying the Reproduction Ratio

The reproduction ratio in the drum axial direction (main scanning direction) is varied by the

lens drive system, and that in the drum peripheral direction (sub scanning direction) is changed by

the scanner drive system.

In the lens drive system, the positions of the fixed focal point lens and the No. 4/5 mirror are

changed to vary the reproduction ratio.

In the scanner system, the relative speed of the No. 1 mirror mount is made higher (for reduc-

tion) or lower (for enlargement) than the drum peripheral speed.

Direct

Optical length

Reduction

Optical length

Enlargement

Optical length

Optical length: L1 < L2, L1 < L3

Figure 3-102

3-2

1999 CANON INC.

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 3 EXPOSURE SYSTEM

C. Lens Drive System

1. Outline

The lens drive system is driven by the scanner/lens drive motor (M2). When the lens solenoid

(SL3) turns on, the switching gear is pushed in the direction of . In this condition, when the

scanner/lens drive motor rotates in reverse direction ( ), the lens unit will move in the direction of

reduction ( ) by the work of the gear and the lens cable.

At the same time, the No. 4/5 mirror unit operates according to the distance over which the lens

unit is moved by the work of the gear and the cam, thereby varying the optical length.

At this time, the blanking lamp also moves in conjunction with the lens to blank out the appro-

priate front/rear widths to suit the selected reduction ratio.

SL3

OFF

Switching

gear

Switching

gear

While the scanner is moving

Top View

While the lens is moving

Cam

Switching gear

SL3

Scanner/lens drive motor

(M2)

No. 4/5 mirror unit

Lens cable

Reduction

Enlargement

Lens unit

Lens home position

sensor (PS2)

Lens shift detecting shaft

for side blanking lamp

DC controller PCB

Figure 3-103

1999 CANON INC.

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

3-3

CHAPTER 3 EXPOSURE SYSTEM

D. Scanner Drive System

1. Outline

The scanner is driven by the scanner/lens drive motor (M2), whose direction of rotation

changes to move the scanner forward or in reverse.

When moving the scanner forward, the speed of rotation of the motor varies according to the

selected reproduction ratio on a continuous basis; when moving the scanner in reverse, on the other

hand, its speed remains the same regardless of the selected reproduction ratio in normal copying

(312mm/sec, about 3.3 as fast as when moving the scanner forward in Direct).

The distance over which the scanner is moved varies according to the length of copy paper and

the selected reproduction ratio.

The scanner/lens drive motor dives the lens drive system as well as the scanner.

PS1 Light-blocking

plate

Scanner home position signal (SCHP)

Scanner home position sensor (PS1)

Q109

Motor driver circuit

DC controller PCB

Figure 3-104

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1999 CANON INC.

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 3 EXPOSURE SYSTEM

2. Relationship between Scanner Sensor and Signal

Scanner

Forward Reverse

Scanner sensor

Signal

Description

PS1(scanner

home position

sensor)

• Provides a means of reference for

determining forward movement

distance.

• Stops the scanner moving in re-

verse in 0.1 sec.

SCHP

Table 3-102

3. Basic Sequence of Operations (scanner)

Power switch

Copy Start key

STBY

INTR

SCFW

SCRV

SCFW

SCRV LSTR STBY

Scanner home position

sensor (PS1)

Pre-registration roller

paper sensor (Q751)

Forward

Reverse

Scanner

Scanning lamp(LA1)

I : Scanner home position detection

II: Lens home position detection

Figure 3-105

The microprocessor on the DC controller PCB controls the forward movement distance of the

scanner with reference to the falling edge of the scanner home position signal. The forward move-

ment distance of the scanner varies according to the length of copy paper and reproduction ratio. If

the ratio is less than 130%, the scanner is moved forward as if for A4 (297 mm); if it is 130% or

more, the scanner is moved forward as if for LTR (279 mm).

For descriptions on how length is detected, see p. 5-10.

1999 CANON INC.

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

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CHAPTER 3 EXPOSURE SYSTEM

4. Controlling the Copying Speed

The machine uses a halogen lamp for scanning, and the heat of the lamp increases the tempera-

ture of the copyboard.

To prevent possible overheating of the copyboard glass, the temperature of the scanner is

monitored by a thermistor (TH2); if its reading reaches 37.5°C or higher, the copying speed is

reduced to 6 cpm.

If this mechanism turns on during continuous copying, it remains on until the end of the copy-

ing job.

At the end of copying, if the reading of the thermistor is 34.5°C or higher, the No. 1 mirror

mount is moved forward 105 mm from the home position and stopped, thereby lowering the tem-

perature of the copyboard fast.

Reference:

While the copying speed is controlled to 6 cpm, the speed of the reverse movement of the

scanner is reduced to prevent overheating of the copyboard glass. (about 75 mm/sec)

Switching to 6-cpm copying speed

SCRV SCFW SCRV

SCFW

SCRV

SCFW

SCRV LSTRSTBY

37.5˚C or higher

34.5˚C or higher

Check timing by thermistor

(TH2)

Main motor (M1)

Pickup clutch solenoid (SL1)

Registration clutch

solenoid (SL2)

Scanner

I : When the pre-registration roller paper sensor (Q751) is off, the pickup clutch solenoid is

turned off to prevent overheating of the pickup clutch solenoid (SL1).

II: By the time the Copy Start key is pressed or the power switch is turned off and then on again

next time, the scanner is moved to and stopped at 105 mm forward from the home position.

Figure 3-106

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1999 CANON INC.

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 3 EXPOSURE SYSTEM

5. Controlling the Scanner/Lens Drive Motor

a. Outline

The scanner/lens drive motor (M2) is a 4-phase stepping motor. The timing at which the drive

power (SC-COM) and pulses (SC-A, SCA*, SC-B, SC-B*) are generated is controlled to turn on/

off the scanner/lens drive motor (M2) or to switch the direction of its rotation.

DC controller PCB

+24VU

J110

R399

SC-COM

(Q101)

SC-COM

(Q109)

SC-A

SC-A*

Motor

SC-B

driver

circuit

SC-B*

Current switching signal 1

Current switching signal 2

Current switching signal 3

1999 CANON INC.

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CHAPTER 3 EXPOSURE SYSTEM

b. Operations

The microprocessor (Q101) mounted on the DC controller PCB receives instructions from the

control panel PCB copying mode settings (e.g., reproduction ratio). In response, it applies drive

pulses to the scanner/lens drive motor (M2) through the motor driver circuit.

The scanner motor is a 4-phase stepping motor, and changes the direction and speed of its

rotation according to the sequence and frequency of drive pulses (SC-A*through SC-B*).

The motor drive voltage is switched on and off by pulse signals (A through B*) generated by

the microprocessor (Q101). Any of these pulse signals is generated when the motor is in operation,

while no pulse signal is generated when the motor is at rest.

The current switching signals from 1 to 3 generated by the microprocessor (Q101) are used to

control the current flowing to the motor so that it varies according to the state of the scanner and the

lens.

Starting the lens Moving the lens

Reversing the

Forwarding the

scanner

Current switching signal 1

Current switching signal 2

Current switching signal 3

c. Detecting Overcurrent for the Scanner/Lens Drive Motor

If overcurrent flows to the scanner/lens drive motor for some reason, the fuse (R339) on the DC

controller PCB will blow to cut the power to the motor.

Caution:

The fuse (R339) will not recover once it has blown.

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1999 CANON INC.

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 3 EXPOSURE SYSTEM

II. EXPOSURE SYSTEM

A. Controlling the Scanning Lamp

1. Outline

Figure 3-201 shows the circuit used to control the scanning lamp, and has the following func-

tions:

• Turning on/off the scanning lamp.

• Controlling the intensity of the scanning lamp.

• Monitoring the state (on/off) of the scanning lamp.

Intensity adjustment

signal

(Q101)

(Q900)

Rectifying

circuit

PWM_1KHz

Phase

control

circuit

Thermal fuse

(FU1)

Serial

communication

Lamp activation

signal

Scanning lamp

(LA1)

LAMP_ON

(HIC001)

Arcing circuit

Activation detection

signal

Rectifying

circuit

LAMP_DETECT

Activation detection circuit

VR107

DC controller PCB

Composite power supply PCB

Figure 3-201

1999 CANON INC.

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

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CHAPTER 3 EXPOSURE SYSTEM

2. Operations

a. Turning On/Off the Scanning Lamp

The DC controller PCB and the composite power supply exchange signals in serial communi-

cation to control the scanning lamp. According to the scanner lamp active voltage signal, the mi-

croprocessor (Q900) on the composite power supply PCB controls the intensity adjustment signal

(PWM_1KHz) and the lamp activation signal (LAMP_ON) to turn on/off the scanning lamp

(LA1).

When LAMP_ON is ‘0’,

The phase control circuit turns on.

The arcing circuit turns on.

The scanning lamp turns on.

When LAMP_ON is ‘1’,

The phase control circuit turns off.

The arcing circuit turns off.

The scanning lamp turns off.

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CHAPTER 3 EXPOSURE SYSTEM

b. Controlling the Intensity of the Scanning Lamp

The intensity of the lamp is controlled by the scanning lamp active voltage signal sent by the

DC controller PCB in serial.

The microprocessor (Q900) on the composite power supply PCB sends the intensity adjust-

ment signal (PWM_1KHz) in response to the scanning lamp active voltage signal. In turn, the

phase control circuit (HIC 001) controls the voltage supplied to the scanning lamp.

The PWM_1KHz signal varies according to the setting of VR107 mounted on the DC control-

ler PCB between 10% and 90% in terms of pulse duty ratio or between 50.5 and 80 V for the 120 V

model (between 85.7 and 145.8 V for the 220/240 V model) in terms of actual voltage by way of

phase control.

However, the intensity remains a specific value for AE exposure so that it is 56 V for the 120 V

model (108.5 V for the 220/240 V model) in terms of actual voltage.

t [msec]

<PWM_1KHz signal>

OFF

[msec]

1kHz

Pulse duty= t/

× 100 [%]

Figure 3-202

c. Monitoring the Activation of the Scanning Lamp

The activation detection signal (LAMP_DETECT) is sent to the microprocessor (Q900) on the

composite power supply PCB as long as the scanning lamp remains on.

The composite power supply PCB sends the lamp activation signal to the DC controller PCB in

serial by way of monitoring the activation of the scanning lamp (LA1).

Related Error Code

E220

• The lamp activation detection signal is not detected for 1 sec or more although the scan-

ning lamp activation signal has been sent.

• The lamp activation detection signal has been detected for 1 sec or more although the

scanning lamp activation signal is not sent.

If an error has been detected, the power switch will be turned off after indicating an error code

for 2 sec.

1999 CANON INC.

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

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CHAPTER 3 EXPOSURE SYSTEM

III. DISASSEMBLY/ASSEMBLY

As needed, disassemble/assemble the machine with the following in mind:

Before starting the work, turn off the power switch and disconnect the power plug for

safety.

2. Unless otherwise instructed, assemble the parts by reversing the steps used to disassemble

it.

3. Identify the screws by type (length, diameter) and location.

4. Use the washers where necessary. (The screws used to mount the grounding wire and

Varistors come with a washer to ensure electrical continuity.)

5. As necessary, cut the harness band.

6. As a rule, do not operate the machine with any of its part removed.

7. A few of the screws used are special screws (with wider thread intervals). Do not use any

screws indiscriminately.

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1999 CANON INC.

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CHAPTER 3 EXPOSURE SYSTEM

A. Scanner Drive Assembly

1. Removing the Scanner/Lens Drive

Motor

1) Remove the front lower cover.

(See Chapter 7.III.A.2.“Removing the

Front Lower Cover.”)

2) Remove the copyboard glass.

(See Chapter 7.III.C.1.“Removing the

Copyboard Glass.”)

3) Remove the four screws [1], and detach

the lens cover [2].

[1]

[2]

Figure 3-301

4) Disconnect the connector (J110) [3] from

the DC controller PCB.

[3]

Figure 3-302

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CHAPTER 3 EXPOSURE SYSTEM

5) Open the machine’s top unit farther, and

hold it in position using the handle (about

30 mm in diameter) of a screwdriver.

Figure 3-303

6) Remove the machine’s two fixing screws

[4] from the scanner/lens drive motor [5].

[4]

[5]

[4]

Figure 3-304

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CHAPTER 3 EXPOSURE SYSTEM

7) Free the top unit (by removing the screw-

driver), and close the top unit.

8) Remove the E-ring [6]; then, lift the cable

drive pulley [7] slightly, and detach the

scanner/lens drive motor [5].

[6]

Lift.

[7]

[5]

Figure 3-305

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1999 CANON INC.

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 3 EXPOSURE SYSTEM

2. Outline of the Scanner Drive Cable

Wind 1.5 times.

(black cable)

Wind 7.5 times.

(silver-colored cable)

Figure 3-306

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1999 CANON INC.

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 3 EXPOSURE SYSTEM

3. Routing the Scanner Drive Cable

a. Before Starting the Work

Prepare the following:

• Mirror positioning tool

• Cable clip

• Adhesive tape

1) Set the mirror positioning tool as shown.

Figure 3-307

2) Prepare about five strips of adhesive tape

(each one about 20 × 50 mm).

3) Remove the copyboard glass.

(See Chapter 7.III.C.1.“Removing the

Copyboard Glass.”)

4) Disconnect the connectors (J101, J131)

[1] from the DC controller PCB.

[1]

Figure 3-308

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CHAPTER 3 EXPOSURE SYSTEM

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].

[4]

[2]

[3]

[2]

[3]

Figure 3-309

6) Remove the three screws [5], and detach

the left upper stay [4].

[5]

[4]

Figure 3-310

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1999 CANON INC.

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 3 EXPOSURE SYSTEM

7) Remove the four screws [6], and detach

the lens cover [7].

[6]

[7]

Figure 3-311

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1999 CANON INC.

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 3 EXPOSURE SYSTEM

b. Routing the Reversing Cable

1) Wind the reversing cables (silver-colored)

[2] on the cable drive pulley [1] 7.5 times

with the longer end on top; then, secure it

in position with a cable clip [3].

[1]

Longer end

Shorter end

[2]

Face with a marking

Figure 3-312

[3]

[1]

[3]

Top View

Figure 3-313

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CHAPTER 3 EXPOSURE SYSTEM

2) Put the cable drive pulley [1] into the shaft

[4], and secure it in position with an E-

ring [5].

[5]

When putting the cable drive pulley into

the shaft, be sure that the hook is at the

front.

Hook

[1]

(front)

[4]

Figure 3-314

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

[7]

[6]

Figure 3-315

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CHAPTER 3 EXPOSURE SYSTEM

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 3-316

[13]

[12]

5) After fitting the shorter end [6] on the

cable hook [12], secure its end with adhe-

sive tape [13].

[6]

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.

Figure 3-317

6) Lead the longer end [14] along the cable

drive pulley, and hook it on the pulley

[15] on the right front side.

[14]

[15]

Figure 3-318

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CHAPTER 3 EXPOSURE SYSTEM

7) Lead the longer end [14] under the No. 1

mirror mount [8] and the No. 2/3 mirror

mount [9]; then, hook it on the pulley [16]

on the left front side and the pulley [17] of

the No. 2/3 mirror mount.

[17]

[8]

[16]

[14]

[9]

Figure 3-319

8) Hook the longer end [14] on the cable

hook [18]; then, secure its end to the left

side with adhesive tape [19].

[18]

[19]

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.

[14]

Figure 3-320

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1999 CANON INC.

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CHAPTER 3 EXPOSURE SYSTEM

c. Routing the Forwarding Cable

1) Fit the longer end forwarding cable

(black) [2] on the top hook of the cable

drive pulley [1], and wind it 1.5 times.

Then, secure the shorter end [3] as shown

with adhesive tape [4].

[4]

[3]

Face without a marking

[2]

[1]

Figure 3-321

2) Lead the longer end [5] along the cable

drive pulley [1] as shown, and hook it on

the pulley [6] on the right front side.

[1]

[5]

[6]

Figure 3-322

[8]

3) Lead the longer end [5] under the No. 1

mirror mount [7]; then, hook it on the pul-

ley [8] of the No. 2/3 mirror mount, and

lead it between the No. 1 mirror mount [7]

and the scanning lamp [9].

[7]

[9]

[5]

Figure 3-323

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CHAPTER 3 EXPOSURE SYSTEM

4) Hook the end of the longer end [5] on the

hole [10] on the right side.

[10]

[5]

Figure 3-324

5) Free the shorter end [3], and hook it on the

pulley [11] on the right rear side.

[3]

[11]

Figure 3-325

[12]

6) Lead the shorter end [3] under the No. 1

mirror mount [7], and hook it on the pul-

ley [12] of the No. 2/3 mirror mount as

shown; then, lead it between the No. 1

mirror mount [7] and the scanning lamp

[9].

[3]

[9]

[7]

Figure 3-326

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CHAPTER 3 EXPOSURE SYSTEM

[3]

[13]

7) Hook the end of the shorter end [3] on the

hole [13] on the right side.

Figure 3-327

8) Free the shorter end [3] and the longer end

[5] (reversing cable), and connect both

with a spring [14]; then, fit the stopper

[15].

[3]

[14]

[15]

[5]

Figure 3-328

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1999 CANON INC.

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 3 EXPOSURE SYSTEM

9) Detach the pulley clip [16] from the cable

drive pulley [1].

[1]

[16]

Figure 3-329

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1999 CANON INC.

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 3 EXPOSURE SYSTEM

d. Positioning the No. 1 Mirror Mount

1) Fix the rear and the front of the No. 1 mir-

ror mount [1] temporarily to the metal fix-

ing [2] of the forwarding cable.

[1]

[2]

Figure 3-330 (rear)

[2]

[1]

Figure 3-331 (front)

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CHAPTER 3 EXPOSURE SYSTEM

[3]

2) Turn the cable drive pulley [4] so that the

three shafts [3] of the mirror positioning

tool for rear and front is as shown.

[4]

[3]

Figure 3-332 (rear)

[3]

Figure 3-333 (front)

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1999 CANON INC.

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 3 EXPOSURE SYSTEM

3) While keeping the condition of step 2),

tighten the positioning screw on the rear

and front of the No. 1 mirror mount [1].

[1]

Figure 3-334 (rear)

[1]

Figure 3-335 (front)

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CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 3 EXPOSURE SYSTEM

B. Lens Drive Assembly

1. Removing the Lens Cable

1) Turn on the power; when the lens has

moved to the Direct position, disconnect

the power plug.

2) Remove the copyboard glass.

(See Chapter 7.III.C.1.“Removing the

Copyboard Glass.”)

3) Remove the main drive assembly.

(See Chapter 7.III.D.2.“Removing the

Main Drive Assembly.”)

4) Remove the four screws [1], and detach

the lens cover [2].

[1]

[2]

Figure 3-336

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1999 CANON INC.

CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)