CHAPTER 2 STANDARDS AND ADJUSTMENTS2-283. Adjusting the Rear/Front Original Stop PositionYou must first correct original skew before adjusting the rear/front original stop position.1) Obtain a sheet of A4 or LTR white copy paper, and draw two lines as indicated.• The sheet will be used as a test sheet.Figure 2-482) Remove the original tray cover from below the original tray.Figure 2-4910mm10mmA4/LTR copy papperOriginaltray cover

dc controller pcb

Canon PC800 Series Service Handbook

I. FEATURES

II. SPECIFICATIONS

III. NAMES OF PARTS

B. Cross Section

IV. USING THE MACHINE

if jams occur frequently

VI. IMAGE FORMATION

basic operation

I. BASIC OPERATIONS

B. Outline of Electrical Circuitry

C. Basic Sequence of Operations

E. Inputs to and Outputs from the DC Controller

I. OPERATIONS

B. Varying the Reproduction Ratio

C. Lens Drive System

D. Scanner Drive System

II. EXPOSURE SYSTEM

outline of the scanner drive cable

image formation system

I. IMAGE FORMATION SYSTEM

B. Timing Chart for the Image Formation System

D. Controlling the Transfer Roller Bias

Separation Static Eliminator Bias

Originals

G. Controlling the Side Blanking Mechanism

DISASSEMBLY/ASSEMBLY

A. Cartridge

B. Transfer Charging Assembly

C. Blank Exposure

I. PICKUP/FEEDING SYSTEM

B. Controlling the Pickup Roller

C. Controlling the Movement of Paper

D. Detecting Jams

delivery delay jam

II. DISASSEMBLY/ASSEMBLY

A. Pickup Assembly

B. Multifeeder Assembly

removing the separation pad

C. Single-feeder Assembly

D. Feeding Assembly

E. Registration Roller Assembly

F. Delivery Assembly

B. Controlling the Fixing Temperature

II. POWER SUPPLY SYSTEM

B. Power Supply Circuit

the Composite Power Supply PCB

III. DISASSEMBLY/ASSEMBLY

A. External Covers

B. Control Panel

C. Copyboard Glass

D. Main Motor/Main Drive Assembly

E. Electrical System

A. Outline

B Basic Construction

C. Basic Operations

D. Detecting an Original

E. Pickup Operation

F. Delivery

G. Controlling the Pickup Motor

H. Controlling the Belt Motor

I. Detecting Original Jams

J. Power Supply

A. Removing the ADF

B. External Covers

C. Drive System

D. Feeding System

I. SELECTING A SITE

II. UNPACKING AND INSTALLATION

B. Placing Copy Paper

III. MOVING THE MACHINE

I. PERIODICALLY REPLACED PARTS

handling the cartridge

troubleshooting

INSPECTION

B. Points to Note for Servicing

II. STANDARDS AND ADJUSTMENTS

C. Electrical

checking the photointerrupters

III. TROUBLESHOOTING IMAGE FAULTS

C. Troubleshooting Image Faults

the back of the copy is soiled

the copy has a fixing fault

the copy has a blurred image

the copy is blank

the copy is solid black

IV. TROUBLESHOOTING MALFUNCTIONS

the scanner fails to move forward

the scanning lamp fails to turn on

the fixing heater fails to turn on

PROBLEMS

PC800 Series

PC860

PC880

PC890

PC900 Series

PC920

PC921

PC940

PC941

PC950

PC960

PC980

PC981