Ricoh A250 Service Manual page 739

SERVICE CALL CONDITIONS
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SC691: Communication Error between BICU and Fax Controller Unit
Definition: [B]
The BICU board cannot communicate with the fax control unit properly.
Possible Causes:
• The cable between the BICU board and the fax control unit has a poor connection
• BICU board defective
• Fax control unit defective
SC692: Communication Error between BICU and Printer Controller Board
Definition: [B]
The BICU board cannot communicate with the printer controller board properly.
Possible Causes:
• The cable between the BICU board and the mother board has a poor connection.
• The connection between the mother board and the printer controller board is poor.
• BICU board defective
• Printer controller board defective
• Mother board defective
SC760: ADF Gate Abnormal
Definition: [B]
The ADF Gate signal line between the ADF main board and the input/output board is
disconnected.
Possible Causes:
• ADF main board defective
• Input/output board defective
• The connection (ADF Gate line) between the ADF main board and the input/output
board is poor.
SC900: Electrical Total Counter Error
Definition: [B]
The electrical total counter is not working properly.
Possible Causes:
• NVRAM defective
SC901: Mechanical Total Counter
Definition: [B]
The mechanical total counter is not working properly.
Possible Causes:
• Mechanical total counter defective
• Input/output board defective
• Disconnected mechanical total counter
A250 7-8
Rev. 02/2000
SM