Ricoh MP 7503SP Field Service Manual page 1313

SC626-01 D BICU, LCIT communication error: Break reception error
During communication with the LCIT, the BICU received a break (Low) signal.
• Serial line connection unstable
• External noise on the line
• LCIT connection to main machine loose, broken, defective
• LCIT control board defective
• BICU defective
• Determine if there is electrical noise on the power line or around the
• Check I/F cable connection of the LCIT on the right side of the main
• Inspect the cable connector for damage.
• Make sure the connector is locked and connected.
• Replace LCIT control board.
• Replace BICU.
SC626-02 D BICU, LCIT communication error: Timeout error
After 1 data frame is sent to the LCIT, an ACK signal is not received within 100
ms, and is not received after 3 retries.
• Serial line connection unstable
• External noise on the line
• LCIT connection to main machine loose, broken, defective
• LCIT control board defective
• BICU defective
• Determine if there is electrical noise on the power line or around the
• Check I/F cable connection of the LCIT on the right side of the main
• Inspect the cable connector for damage.
• Make sure the connector is locked and connected.
• Replace LCIT control board.
• Replace BICU.
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SC600: Data Communication
1311