Canon NP6251 Service Manual page 649

CHAPTER 11 TROUBLESHOOTING
56. The deck lifter fails to move up. (paper deck-A1)
Cause Step
Paper deck
-A1
Lifter cable
Spring, Lever
Deck lifter
motor (M102)
DC controller
PCB
Deck open
detecting switch
(SW102)
Deck lifter
position sensor
(Q110)
DC controller
PCB
11-118
COPYRIGHT © 1997 CANON INC.
Checks
1 Is the deck set correctly?
2 Is the lifter cable routed correctly?
3 Push up the pick-up roller
releasing lever with a finger. Does
the pick-up roller move down?
4 Does the deck lifter motor rotate?
5 Set the meter to the 12VDC
range. Does the voltage between
2001A-3 and GND (–) on the DC
controller PCB change from about
0 to 5 V when the deck is closed?
6 Set the meter to the 12VDC
range. Does the voltage between
J2001A-4 (+) and GND (–) on the
DC controller PCB change as
follows?
when the deck is closed, 0 V
when the deck is opened, 5 V
YES/NO
NO
NO
NO
YES
NO
YES
YES
NO
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
Set the deck correctly.
Route the cable
correctly.
Remove the pick-up
assembly, and check the
spring lever.
Go to step 6.
Replace the DC
controller PCB.
Check the wiring to the
switch; if normal, replace
the switch.
Check the lever and the
wiring; if normal, replace
the sensor.
Replace the DC
controller PCB.