Canon NP6621 Service Handbook page 90

TROUBLESHOOTING FEEDING FAULTS
6 The lifter fails to rise (paper deck).
Cause Step
Deck 1
Lifter cable
2
Spring, 3
Lever
Pedestal 4
motor
Pedestal 5
controller
PCB
Pedestal
motor
Deck open 6
sensor
(PS6)
Deck lifter 7
drive clutch
(CL4)
Pedestal
controller
PCB
5–10
Checks
Is the deck properly set?
Is the lifter cable properly attached?
Push up the pick-up roller release
lever by a finger. Does the pick-up
roller lower?
Does the pedestal motor rotate?
Set the meter to the 50VDC range.
Does the voltage between J202-2 (+)
and J202-4 (–) on the pedestal
controller PCB change to +34V when
the deck is slid in and then to 0V?
Set the meter to the 12VDC range.
Does the voltage between J113-10 (+)
and J113-8 (–) on the pedestal
controller change as follows?
0V when the deck is opened; and
5V when the deck is closed.
Set the meter to the 30VDC range.
Does the voltage between J114-4 (+)
and J114-5 (–) on the pedestal
controller PCB change to 24V when
the deck is slid in and then to 10V?
Yes/No Remedy
NO Set the deck properly.
NO Attach the cable properly.
NO Detach the pick-up assem-
bly, and check the spring and
lever.
YES Go to step 6.
NO Replace the pedestal control-
ler PCB.
YES Check the wiring up to the
pedestal motor; if normal,
replace the pedestal motor.
NO Check the lever and wiring; if
normal, replace the sensor.
YES Check the wiring up to the
deck lifter drive clutch; if
normal, replace the clutch.
NO Replace the pedestal control-
ler PCB.