Canon NP6251 Service Manual page 633

CHAPTER 11 TROUBLESHOOTING
33. The deck lifter fails to move up. (front paper deck + cassette)
Cause Step
Deck
Lifter cable
Spring, Lever
Pick-up motor
(M2)
DC controller
PCB, Deck
open/closed
sensor (PS38,
right deck;
PS40, left deck)
Lifter position
sensor (PS32,
right deck;
PS40, left deck)
Deck lifter drive
motor (M18,
right deck; M19,
left deck)
DC controller
PCB
11-102
COPYRIGHT © 1997 CANON INC.
Checks
1 Is the deck set correctly?
2 Is the lifter cable routed correctly?
3 Push down the pick-up roller
releasing lever with a finger. Does
the pick-up roller move down?
4 Does the pick-up motor (M2)
rotate?
5 Set the meter to the 12VDC
range. Does the voltage between
J116B-8/J121A-2 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. Is the voltage between
J116A-7/4 (+) and GND (–) as
indicated when the deck is
opened/closed?
when closed, 0 V
when opened, 5 V
7 Set the meter to the 30VDC
range. Does the voltage between
J119B-9 (left)/11(right) (+) and
GND (–) on the DC controller PCB
change from 0 to 24 V when the
deck is slid into the machine?
YES/NO
NO
NO
NO
YES
NO
YES
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 and the lever.
Go to step 6.
Replace the DC
controller PCB.
Check the wiring up to
the sensor; if normal,
replace the sensor.
Check the lever and the
wiring; if normal, replace
the sensor.
Check the wiring up to
the deck lifer drive
motor; if normal, replace
the clutch.
Replace the DC
controller PCB.