Ricoh SP 8400DN Field Service Manual page 1294

6.Troubleshooting
SC No. Type
Detected an error when connecting the communication line.
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Check if the SC occurs by turning the main power OFF then ON. If the SC occurs again, do
the following steps. Check if the SC reoccurs by cycling the power after each step.
1.
2.
3.
SC No. Type
SC623- D Paper Bank Communication Error (D696)
00
When two trays PFU (M494) and side LICT (D696) or LCIT (M496) and side LCIT (D696)
are installed,
1.
2.
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SC No. Type
SC641-00 D
556
Error Name/Error Condition/Major Cause/Solution
Paper bank control board defective
BCU defective
Paper bank-main machine connection fault
Check if all connectors in tray 1, 2, and optional paper tray are connected securely.
Reconnect the connectors if they are disconnected, or loose.
Check the harness in tray 1, 2, and optional paper tray. Replace the harness if it is
disconnected, or damaged.
Check if there are any signs of a short circuit on the Bank Main Board. If there are any
defects, replace the board.
Error Name/Error Condition/Major Cause/Solution
When the upper stream unit (M494 or M496) recognizes the lower stream unit (D696),
the break of the lower stream unit is not canceled within predetermined milliseconds.
After the upper stream unit (M494 or M496) recognizes the lower stream unit (D696),
there is no ACK within predetermined milliseconds after transmission of a data frame to
the lower stream unit, and a timeout error occurs for 3 times consecutively even if
retransmission is performed.
Bank control board fault
Connector disconnected
Turn the power off/on.
Reset the optional paper tray connecting cable.
Replace the BCU.
Replace the optional paper tray.
Error Name/Error Condition/Major Cause/Solution
Communication error between BCU and Controller board.
Controller board does not respond after BCU tries to communicate three times.
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Controller board software error
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Connection error between BCU and Controller board
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Engine board software error
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Check connections between Controller board and BCU.