Oki C7500n Maintenance Manual page 123

4 Up/Down movement error of the image drum unit (ID)
• Turn the printer OFF, then turn it ON after a few seconds.
• Are all ID drums rotating properly during print operation?
• No Is the ID motor resistance within the regulated value (approx. 8.6Ω)?
No Replace the faulty IDU motor.
M
• Yes Is 34V output to F3 and F5 on the engine board?
No Replace the low-voltage power unit.
M
• Yes Check the cable connections, then replace the engine board.
M
• Yes Is the IDU sensor terminal functioning properly?
No Check the gear mesh status and sensor terminal function, the replace the gear or sensor
terminal.
M •
Yes Is the ID sensor terminal functioning properly?
(Check the JODEN connector pin signal on the driver board (K7N/K7V PXB).)
Pin 12
Pin 2
Pin 4
Pin 14
Are all at 5V level or 0V level?
No Replace the connection board (N71 PWB).
M •
Yes Check the cable connection between the connection board (N71 PWB) and engine board
(K7N PWB), then replace the engine board.
41955801TH Rev.8
: IDU sensor - yellow
: IDU sensor - magenta
: IDU sensor - cyan
: IDU sensor - black
Oki Data CONFIDENTIAL
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