Oki C910 Service Manual page 221

Printing Thinned Out
• Is the LED head lens dirty?
YES
• NO Are all LED head Assy parts properly connected to the relay PCB (S2H PCB) and
engine PCB (S2V(1200dpi) or S2X(600dpi) PCB)?
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 head shield cable.
Has the problem been corrected?
YES
• NO Check the cable connection, then replace the engine PCB (S2V(1200dpi) or
S2X(600dpi) PCB).
Has the problem been corrected?
YES
• NO Check the cable connection. Then replace the low voltage power unit.
Has the problem been corrected?
YES
• YES Is +24V output to the HVOLT connector Pin 16 of the Engine PCB (S2X(1200dpi) or
S2X(600dpi) PCB)?
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(1200dpi) or S2X(600dpi) PCB), 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.
44043511TH Rev.2
Clean the LED head lens.
Check the cable connection of the LED and the cable connection 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.
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END
Replace the engine PCB.
END
Properly connect the I/D unit terminal to the contact Assy.
Oki Data CONFIDENTIAL
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