Oki C9850 Maintenance Manual page 207

Blank Sheet (Figure 7-2
• Are all LED head Assy parts 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 +20V or more output to the Pin 16 of the HVOLT connector on 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
)
Check the cable connection of the LED head and cable connection between
between the relay PCB 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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