Ricoh D131 - Page 504

SC600: Data Communication
SM Appendix 2-37 D131/D132/D133
Appendix:
Service Call
Conditions
SC621-02 D
BCU/Finisher communication error: Timeout error
During communication between the finisher MBX and the BCU, no
ACK signal was detected for 100 ms, even after three attempts.
 Connection between main machine loose, broken, defective
 Breaker switch defective
 Power cord loose, broken, defective
 Peripheral unit control board defective
 BCU defective
 Serial line level unstable, external noise on the line
SC623 D
BCU-PFB communication error
More than 2 in communication errors between the BCU and PFB
were detected after startup, or more than 3 errors were detected
after settings were initialized.
 Harness connectors between BCU and PFB loose, broken,
disconnected
 Serial line connection unstable
 External noise on the line
 BCU defective
 PFB defective
SC626-01 D
BICU, LCT communication error: Break reception error
During communication with the LCT, the BICU received a break
(Low) signal.
 LCT connection to main machine loose, broken, defective
 LCT control board defective
 BCU defective
 Serial line connection unstable
 External noise on the line