Ricoh MP C6502SP Field Service Manual page 1169

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Error Name/Error Condition/Major Cause/Solution

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.

• DUB defective

• PFB defective

• Harness between DUB and PFB broken

• Connecter between DUB and PFB disconnected

• Unintended electrical noise

• Replace the DUB.

• Replace the PFB.

• Replace the harness between DUB and PFB.

• Replace the connector between DUB and PFB.

Error Name/Error Condition/Major Cause/Solution

TSB communication error at power-on

TSB communication error during normal operation

TSB BREAK detection during normal operation

Service Call 620-689

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