CHAPTER 11 TROUBLESHOOTING
COPYRIGHT © 1997 CANON INC. CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
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The Add Toner indicator fails to turn off.
Cause
Toner sensor
(TS1)
DC controller
PCB
Screw, gear,
stirring rod
Checks
Is toner present around the toner
sensor (TS1) at the front of the
developing assembly?
Replace the toner sensor. Is the
problem corrected?
Execute ‘409’ in service mode [4].
Is the stirring rod inside the
hopper rotating normally while the
hopper motor is rotating?
Step
1
2
3
YES/N
NO
YES
NO
NO
YES
Action
Go to step 3.
End.
Check the wiring from
the DC controller PCB to
the toner sensor; if
normal, replace the DC
controller PCB.
Check the screw, gear,
and stirring rod to see if
they are installed
properly.
Check the shutter
assembly of the toner
supply mouth between
the hopper and the
developing assembly.