Canon NP6320 Service Manual page 225

17. Paper is not picked up from multifeeder
Cause Step
Sensor arm
Pre-registra-
tion paper
sensor (Q2)
Multifeeder
clutch (CL2)
Gears
DC controller
PCB
18. Registration rollers do not rotate
Cause Step
Belts and
gears
Registration
roller clutch
(CL1)
DC controller
PCB
COPYRIGHT © 1999 CANON INC.
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1 Is the arm of the pre-registration paper
sensor (Q2) broken? Does it move
smoothly?
2 Is the pre-registration paper sensor (Q2)
functioning normally?
3 Disconnect J312 on the DC controller
PCB. Set the meter to the 1kΩ range. Con-
nect the leads to J312-9 and J312-10 of
part of J312 connected to the wiring. Is the
resistance approx. 155Ω?
4 Is the leading edge of the copy paper
reaching the registration rollers?
5 Are all drive gears from the main motor
(M1) to the pre-registration rollers nor-
mal?
1 Are the belts and gears from the main mo-
tor (M1) to the registration roller clutch
(CL1) normal?
2 Disconnect J308 on the DC controller
PCB. Set the meter to the 1kΩ range. Con-
nect the leads to J308-3 and J308-4 of part
of J308 connected to the wiring. Is the
registance approx. 120Ω?
3 Connect J308 to the DC controller PCB.
Set the meter to the 30VDC range. Con-
nect the (+) lead to J308-3 and the (−) lead
to J308-4. Press the Copy Start key. Does
the voltage change from 0V to about 24V?
CANON NP6320 REV.0 DEC. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 10 TROUBLESHOOTING
Checks
Checks
YES/
Action
NO
NO Replace the sensor arm.
NO Replace the pre-registra-
tion paper sensor (Q2).
NO Check the wiring from
J312 to CI2. If it is nor-
mal, replace multifeeder
clutch (CL2).
YES Refer to the sub-section
"Registration rollers do
not turn."
NO Re-install or replace the
gears.
YES Replace the DC control-
ler PCB.
YES/
Action
NO
NO Re-install or replace any
belts or gears.
NO Check the wiring from
J308 to CL1. If it is nor-
mal, replace the registra-
tion roller clutch (CL1).
NO Replace the DC control-
ler PCB.
YES Do the registration roll-
ers or drive gears inter-
fere with other parts?
Remove parts as neces-
sary.
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