Ricoh MP C6502SP Field Service Manual page 1174

5. Troubleshooting
SC No.
SC665-02
1172
Level Error Name/Error Condition/Major Cause/Solution
FFC set detection (Error between BCU and IOB)
The HORUS port on the BCU is used for FFC connection detection to
detect FFC (harness) disconnection and loose connection between BCU
and IOB. By checking the voltage level of the AD terminal, the connection
status can be checked.
Details:
• When the harness between BCU and IOB becomes disconnected,
the number of parallelly connected resistors changes and therefore
the voltage input to the AD terminal changes.
D
• FFC harness between BCU and IOB broken
• FFC harness between BCU and IOB not connected fully
• BCU damaged
• IOB damaged
• Replace the FFC harness between BCU and IOB.
• Reconnect the FFC harness between BCU and IOB.
• Replace the BCU board.
• Replace the IOB.