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3–8
IMAGE FAULTS
6
The copy is foggy (overall).
Cause
Scanner
Pre-expo-
sure lamp,
DC control-
ler PCB
Developing
roll
Developing
cylinder
Developing
assembly
Drum
cartridge
Composite
power
supply PCB
Checks
Perform the Basic Image Adjustment
Procedure. Is the problem corrected?
Clean the scanning lamp, reflecting
plate, side reflecting plate, mirror,
lens, and dust-proofing glass. Is the
problem corrected?
Does the pre-exposure lamp remain
ON during copying operation?
Is the developing roll worn?
Is the developing cylinder worn?
Is the developing cylinder insulated
from the machine GND?
(Turn OFF the power, and disconnect
J908 of the composite power supply
PCB. Check the electrical continuity
between the developing assembly
side of J908-2 and the machine side
plate with a meter.)
Is the indication for service mode 105
(primary current indication) 10 µA or
less?
Yes/No
YES
YES
NO
YES
YES
NO
NO
YES
Remedy
End.
End.
See “The pre-exposure lamp
fails to turn ON.”
Replace the developing
assembly.
Replace the developing
assembly.
Check the developing
cylinder and parts around the
developing connector.
Replace the drum cartridge.
Replace the composite
power supply PCB.
Step
1
2
3
4
5
6
7
Содержание NP6621
Страница 4: ...ii ...
Страница 8: ...vi ...
Страница 48: ...3 2 IMAGE FAULTS ...
Страница 49: ...3 3 IMAGE FAULTS NOT USED ...
Страница 50: ...3 4 IMAGE FAULTS B Image Fault Samples not available ...
Страница 80: ...4 16 TROUBLESHOOTING MALFUNCTIONS ...
Страница 98: ...6 8 ARRANGEMENT AND FUNCTIONS OF THE ELECTRICAL PARTS D PCBs Figure 6 603 1 2 3 4 5 6 7 8 9 10 11 12 ...
Страница 108: ...6 18 ARRANGEMENT AND FUNCTIONS OF THE ELECTRICAL PARTS 4 Fixing Heater Driver PCB Figure 6 611 J402 1 J401 W1 W2 ...
Страница 134: ...A 4 APPENDIX ...
Страница 135: ...A 5 APPENDIX C GENERAL CIRCUIT DIAGRAM not available ...
Страница 136: ...A 6 APPENDIX ...
Страница 144: ...A 14 APPENDIX ...