Ricoh MP C6502SP Field Service Manual page 1168

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5. Troubleshooting

Error Name/Error Condition/Major Cause/Solution

TDCU communication error.

ASAP communication protocol error

• A BREAK signal was detected at power-on.

• Non-response (100 ms) was detected 3 times consecutively during

normal operation.

• NAK was received 3 times before ACK was received during normal

• A BREAK signal was detected during normal operation.

• IOB defective

• Replace the IOB.

Error Name/Error Condition/Major Cause/Solution

DUB communication error at power-on

DUB communication error during normal operation

DUB BREAK detection during normal operation

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