Oki C9850 Maintenance Manual page 205

The screen in light on the overall. Or there is overall color drift in the printed image.
(Figure 7-2
• Is there enough toner? (Is [Toner Short] displayed?)
YES
• NO Is standard paper used?
NO
• YES Is the LED head lens dirty?
YES
• NO Is the entire LED head Assy properly connected to the relay PCB (S2H PWB)
and Engine PCB (S2V PWB)?
NO
• YES Is the LED head pressing spring properly set?
NO
• YES Are the protrusions on both sides of the LED head properly in contact with each
FG plate spring?
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
cassette Assy.
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
)
Replenish toner.
Use standard paper.
Clean the LED head lens.
Check the cable connect (between each LED head and engine PCB),
then properly connect the cable between the LED head and engine PCB.
Properly set the pressing spring.
Correct the bend in the FG plate spring.
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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