Oki C7400 Maintenance Manual page 108

4
Image Drum Unit (ID) Up-and-Down Operation Error
• Turn the printer off and, after a few seconds, on again.
• Are all the ID drums revolving properly during printing?
• No Does the resistance of the ID motor lie at the rated value (approx. 4.0 )?
No Replace the defective IDU motor.
• Yes Is 32V output to F3 and F5 of the engine board?
No Replace the low voltage power unit.
• Yes Replace the engine board after checking the cable connection.
• Yes Do the IDU sensor terminals operate properly?
• No Replace the defective gear or sensor terminals after checking the gear engagement and the
sensor terminal operation.
• Yes Does the ID sensor lever move properly?
(Check the signals on the JODEN connector pin of the driver board (71K PWB).)
Pin 12: IDU sensor Yellow
Pin 2: IDU sensor Magenta
Pin 4: IDU sensor Cyan
Pin 14: IDU sensor Black
Do all lie at 5V level or 0V level?
No Replace the connection board (N71 PWB).
• Yes Replace the engine board after checking the cable connection between connection board
(N71 PWB) and the engine board (71K PWB).
41316401TH Rev.9
Oki Data CONFIDENTIAL
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