Ricoh MP 7503SP Field Service Manual page 1312

7. Troubleshooting
SC621-01
SC621-02
1310
D BICU > Finisher communication error: Break error
During communication with the finisher MBX, the BICU received a break
(LOW) signal from the finisher.
• I/F cable connection to main machine or upstream finisher and loose,
broken, defective
• Breaker switch defective
• Power cord loose, broken, defective
• Peripheral unit control board defective
• Inspect I/F cable connections of finishers to the main machine or to
upstream unit.
• If the peripheral unit has a breaker switch, test it.
• Check power cord of peripheral unit if it has separate power cord.
• Replace peripheral unit control board.
D BICU> Finisher communication error: Timeout error
During communication between the finisher MBX and the BICU, no ACK signal
was detected for 100 ms after three attempts.
• Serial line level unstable, external noise on the line
• I/F cable connection to main machine or upstream finisher and loose,
broken, defective
• Breaker switch defective
• Power cord loose, broken, defective
• Peripheral unit control board defective
• BICU defective
• Determine if there is electrical noise on the power line or around the
machine.
• Inspect I/F cable connections of finishers to the main machine or to
upstream unit.
• If the peripheral unit has a breaker switch, test it.
• Check power cord of peripheral unit if it has separate power cord.
• Replace peripheral unit control board.
• Replace BICU