Oki C9850 Maintenance Manual page 206

The white area gets dirty. (Figure 7-2
• Has the image drum been exposed to external light for a long time?
YES
• NO Is the fuser unit roller dirty?
YES
• NO Correct the [Paper Thickness] setting.
NO
• YES Replace the LED head.
Has the problem been corrected?
YES
• NO Replace the engine PCB (S2V PWB).
Has the problem been corrected?
YES
• NO Replace the head shield cable.
Has the problem been corrected?
YES
• NO Check the cable connection, then replace the low voltage power unit.
Has the problem been corrected?
YES
• NO Is +24V output to the HVOLT connector Pin 16 of the Engine PCB (S2V PWB)?
NO
• YES Check the cable connection, then replace the high voltage power unit or belt unit.
Has operation been restored?
YES
• NO Is the I/D unit terminal properly connected to the contact Assy?
(Refer to Figure 7-3)
NO
• YES Replace Image Drum Unit.
Note! 1. When replacing the Engine PCB (S2V PWB), remove the EEPROM from the old
PCB, then mount that EEPROM on the new PCB.
2. If the EEPROM is not going to be replaced, refer to Section 5.2.2.
43627911TH Rev. 3
Replace I/D Unit.
Replace the fuser unit.
Properly set the [Paper Thickness].
END
END
END
END
Replace the engine PCB.
END
Properly connect the I/D unit terminal to the contact Assy.
)
Oki Data CONFIDENTIAL
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