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3.
Checking the Potential Control System
START
Start non-potential control mode
4
(PO.CONT '1';
).
NO
Is the problem corrected?
YES
Turn OFF the power switch.
Short J127-1 and -2 on the DC
controller PCB with a jumper wire.
Disconnect J103.
(zero-level check)
Turn ON the power switch.
Start service mode
(
2
).Is the indication of address
NO
Replace the DC controller PCB.
P023 between '0003' and '001B'
during initial rotation?
YES
Turn OFF the power switch.
Remove the jumper wire used to
short J127-1 and -2 on the DC
controller PCB. Connect J103.
Turn ON the power switch.
Check to make sure that the potential
measurement PCB is supplied with
power, and replace the potential
measurement unit.
COPYRIGHT © 1997 CANON INC.
CANON NP6045 REV. 1 MAR. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
<Checking the Transfer Output>
Is the toner image
NO
on the photosensitive drum
before transfer normal?
YES
Start non-potential control.
(
4
) PO.CONT '1'
Measure the voltage between J114-A6
(+) and J114-A13 (—) on the DC controller
PCB during copying. (STEP A)
(transfer output)
Select 'TC' (transfer charging
assembly current) in service mode
(
1
).Convert the value (unit:
A) indicated during copying into its
equivalent control voltage by
referring to 48 "Potential Control
Conversion Table."
Is the
difference between
NO
the actual measurement taken for
Replace the DC control PCB.
STEP A and the value under
'TC' in service mode
within –10%?
YES
Replace the
high-voltage transformer.
YES
Is the problem corrected?
NO
Check the transfer charging
assembly for leakage.
Try changing the value of 'FUZZY'
in service mode (
5
).
Try replacing the copy paper.
<Checking the Scanning Lamp Output>
Start potential control.
(
4
) PO.CONT '0'
Turn ON the power switch.
Select the ON voltage limiter for the
scanning lamp.
(
4
) LIMT.
Is '1' indicated under 'LIMIT'?
YES
Clean the standard white plate,
mirror, lens, and dust-proofing
glass; then, turn OFF and then ON
the power switch.
Is '1' indicated under 'LIMIT'?
YES
Start non-potential control .
(
4
) PO.CONT '1'
END.
Measure the voltage between
J111-B7 (+) and J111-B8 (—) on
the DC controller PCB during
A
B
NO
NO
10-39
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Troubleshooting
