Pick-Up Fails. (Multifeeder) - Canon NP6251 Service Manual

CHAPTER 11 TROUBLESHOOTING

36. Pick-up fails. (multifeeder)

Cause Step
Pick-up roller, 1
Pick-up/feeding
roller,
Separation
roller
Belt, Gear, 2
Coupling
3
4
DC controller
PCB
5
Multifeeder
pick-up clutch
(CL7)
Multifeeder 6
pick-up
solenoid (SL10)
DC controller
PCB
11-106
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Checks
Is the orientation of the pick-up
roller, pick-up/feeding roller, and
separation roller correct?
Is the drive from the main motor
transmitted to the multifeeder pick-
up assembly through the belt,
gear, and coupling?
Is the leading edge of the copy
paper as far as the registration
roller?
Set the meter to the 30VDC
range, and connect the probe of
the meter to J115B-1 (+) and
J115B-2 (–) on the DC controller
PCB; then, select the multifeeder.
Does the voltage change from 24
to 0 V when the Copy Start key is
pressed?
Connect the probes of the meter
to J115B-11 (+) and J115B-12 (–)
on the DC controller PCB. Does
the voltage change from about 0 V
to 24 V and then to 0 V when the
Copy Start key is pressed?
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
YES/NO Action
NO Install the rollers
correctly.
NO Check the belt, gear,
and coupling.
YES See "The registration
roller fails to rotate."
NO Replace the DC
controller PCB.
YES Replace the multifeeder
pick-up clutch (CL7).
NO Replace the multifeeder
pick-up solenoid (SL10).
YES Replace the DC
controller PCB.