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41388601TH Rev.2 114 /
4 Image Drum Unit (IDU) Up/Down Error
• Turn off the printer, wait a few seconds, then turn it on again.
• Does each drum unit rotate properly while printing?
• No Is the resistance of the IDU motor at the rated value (approx. 4.0 Ω)?
No Replace the defective IDU motor.
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• Yes Is +32V supplied to the POWER connector Pins 7~10 on the engine board?
No Replace the low-voltage power unit.
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• Yes Check cable connection, or replace the engine board.
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• Yes Does the IDU sensor lever work adequately?
• No Check gear engagement and the sensor lever operation, or replace the defective gear or
sensor lever.
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• Yes Does the IDU sensor operate properly?
Verify the signal on the JODEN connector pins on the driver board (K73 PWB).
Pin 4: IDU sensor cyan
Pin 14: IDU sensor black
Pin 2: IDU sensor magenta
Pin 12: IDU sensor yellow
No Replace the junction board (N73 PWB).
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• Yes Check the cable connection between the junction board (N73 PWB) and engine board (K73
PWB), or replace the engine board.