Canon GP405 Service Manual page 512

CHAPTER 14 TROUBLESHOOTING
41 The lifter fails to move up.
Cause
Cassette
Paper level sensor
Lifter drive
assembly
Pick-up assembly
42 Pick-up operation fails (from the multifeeder).
Cause
Multifeeder pick-
up clutch (CL2)
Paper guide cam
Multifeeder
holding plate
releasing solenoid
(SL3)
DC controller
PCB
43 The registration roller fails to rotate.
Cause
Registration roller
Registration
clutch (mounting)
DC controller
PCB
Registration
clutch (CL1)
14-94
Step Check
1 Slide out the cassette, and move up
the holding plate of the cassette by
hand. Does it move smoothly?
2 Is the paper level sensor in the
problem holder normal? (See the
descriptions on how to check
photointerrupers.)
3 Is the lifter drive assembly normal?
Step Check
1 Select the multifeeder, and press
the Copy Start key. Doe the pick-up
roller of the multifeeder rotate?
2 Select the multifeeder. Doe the
paper guide plate spring up when
the Copy Start key is pressed?
3 Does I/O>DC-CON>P005-bit7
change from '0' to '1' during pick-
up from the multifeeder?
Step Check
1 Press the Copy Start key. Doe the
registration roller rotate
immediately after the scanner starts
to move forward?
2 Is the grip ring used to mount the
registration clutch mounted
securely?
3 Does I/O>DC-CON>P005-bit3
change from '0' to '1'? (J102-B4:
CL1D*)
COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Yes/No Action
NO Check the inside of the
cassette for foreign
matter.
NO Replace the pick-up
PCB.
NO Correct it.
YES Replace the pick-up
assembly.
Yes/No Action
NO Check the wiring; if
normal, replace the
clutch.
YES Check the position of the
paper guide plate cam
and the separation pad.
As necessary, adjust/
replace the parts.
NO Check the wiring; if
normal, replace the
solenoid.
YES Replace the DC
controller PCB.
Yes/No Action
YES Check the registration
roller drive assembly
and wiring.
NO Mount it securely.
NO Replace the DC
controller PCB.
YES Check the wiring from
the DC controller PCB
to the clutch; if normal,
replace the clutch.