Ricoh D131 - Page 512

SC600: Data Communication
SM Appendix 2-45 D131/D132/D133
Appendix:
Service Call
Conditions
SC670 D
Engine start up error CTL
The BCU failed to respond within the prescribed time when the
machine was turned on.
 Connections between BCU and controller board are loose,
disconnected, or damaged.
 Replace the BCU
 Replace the controller board
SC671 D
Illegal Engine Board CTL
An illegal engine board was detected by the firmware at power on.
 Replace BICU