Canon NP6317 Service Manual page 218

CHAPTER 10 TROUBLESHOOTING
29. indicator does not go OFF when there is toner during black copying
Cause/Problem
Procedure
area
DC controller 1
PCB
DC controller 2
PCB
Stirring rod 3
gear
Black toner
level sensor
30. indicator does not go ON
Cause/Problem
Procedure
area
1
Wiring 2
Control panel 3
DC controller
Card sensor 4
PCB
Controller
PCB
10-54
Check
Does the indicator come back ON when
the power switch is set OFF, and then ON
again?
Turn the power OFF, and disconnect J39.
Turn the power ON, and press the COPY
START key to make copies of the follow-
ing:
[1] making 7 continuous copies on A3
[2] making 9 continuous copies on A4
[3] making 5 single copies on A3
[4] making 5 single copies on A4
Press the COPY START key once again.
Does the indicator go red when any of the
above has been made?
Does the stirring rod inside the developing
assembly operate normally?
Check
Was the shorting connector for J504 dis-
connected when the control card unit was
installed?
Set the power switch OFF; then, discon-
nect J316 on the DC controller PCB. Set
the meter to the "
Connect the leads to J316-1 and J504-4 on
the part of J316 connected to the wiring.
Does the meter indicate 0W?
Does the problem disappear when the con-
trol panel is replaced?
Does the problem disappear when the card
sensor PCB in the Control Card V unit is
replaced?
COPYRIGHT © 1999 CANON INC.
Result
Result
1" range.
CANON NP6317 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
Yes Replace the DC control-
ler PCB.
Yes Replace the DC control-
ler PCB.
No Check the stirring rod
and gear.
Yes Replace the black toner
level sensor (TS1).
Action
No Disconnect the shorting
connector, and connect
the connector of the con-
trol card unit.
No Check the wiring be-
tween the control card V
unit and the DC control-
ler PCB.
Yes End.
No Replace the DC control-
ler PCB.
Yes End.
• There may be a prob-
lem with the relay on
the card sensor PCB.
No Replace the controller
PCB of the Control Card
V unit.