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22. The scanner fails to move forward/in reverse.
23. The registration roller fails to rotate.
COPYRIGHT
©
1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
10-74
CHAPTER 10 TROUBLESHOOTING
Checks
Is the cable for the scanner routed
correctly?
Is the scanner rail free of dirt, and
does the scanner move smoothly
when pushed by hand?
Set the meter to the 50V DC
range. Does the index of the
meter point to 34 V when the (+)
probe is connected to JJ210-5
and the (-) probe is connected to
J210-6 on the composite power
supply PCB?
Replace the DC controller PCB. Is
the problem corrected?
Replace the scanner motor. Is the
problem corrected?
Cause
Cable
Scanner path
Composite
power supply
PCB
DC controller
PCB
Scanner motor
Step
1
2
3
4
5
Results
NO
NO
NO
YES
YES
Action
Re-route the cable.
Check the scanner rail
for dirt and foreign
matter; in addition check
for objects that may
come into contact with
the scanner.
See “DC power supply is
absent.”
End.
End.
Checks
Press the Copy Start key. Does
the registration roller rotate for
about 1 sec immediately after the
scanner starts to move forward?
Set the meter to the 30V DC
range. Is the voltage between
J303-5 (+) and J303-6 (-) on the
DC controller PCB change from
about 0 V to about 24 V when the
Copy Start key is pressed?
Cause
Registration
roller
DC controller
PCB
Registration
clutch (CL1)
Step
1
2
Results
YES
NO
YES
Action
Check the drive
assembly of the
registration roller.
Replace the DC
controller PCB.
Check the wiring
between the DC con-
troller PCB and CL1; if
normal, replace the CL1.