The Copy Has A Fixing Fault - Canon PC920 Service Manual

14 The copy has a fixing fault.

Cause Step
Copy paper 1
Fixing film 2
Fixing heater 3
DC control-
ler PCB,
Composite
power
supply PCB
15 The copy has a misplaced leading edge. (extremely excess margin)
16 The copy has a misplaced leading edge. (excess margin)
17 The copy has a misplaced leading edge (no margin)
Cause Step
Pickup 1
roller,
Pickup
clutch,
Cassette
Sensor 2
(PS1), Light-
blocking
plate
VR104 3
Solenoid 4
(SL2), DC
controller
PCB
Copy paper 5
Registration
clutch
COPYRIGHT © 1999 CANON INC.
Checks
Is the copy paper of a recommended
type?
Is the problem vertical and, in addi-
tion, in the form of lines?
Does the heater turn on when the Copy
Start key is pressed?
Checks
Make copies using the cassette and
manually. Are the results the same?
Are the scanner home position sensor
(PS1) and the light-blocking plate
normal? (See the instructions on how
to check the photointerrupter.)
Adjust the image leading edge margin.
(p. 11-6) Is the problem corrected?
Does the registration clutch solenoid
(SL2) operate normally?
Is the paper of a recommended type?
CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 11 TROUBLESHOOTING
YES/NO
NO Try a recommended
type. If the results are
good, ask the user to
use a recommended
type.
YES Check the fixing film
and the fixing lower
roller for scratches. If
there are scratches,
replace them.
NO See "The fixing heater
fails to turn on."
YES The control tempera-
ture of the fixing
heater is likely to be
too low. Check the
fixing assembly top
unit, DC controller
PCB, and composite
power supply PCB.
YES/NO
NO Check the pickup
roller, pickup clutch,
and cassette. Or,
replace them.
NO Replace the sensor, or
check the light-
blocking plate.
YES End.
NO 1. Check the solenoid
(SL2).
2. Check the DC
control PCB.
NO Try a recommended
type. If the results are
good, ask the user to
use a recommended
type.
YES Check the registration
clutch.
Action
Action
11-57