Ricoh D131 Service Manual page 554

Software performance error
If the processing program shows abnormal performance and the
program is abnormally ended, this SC is issued.

Controller board defective
SC899 D

Software defective

Replace the controller board.

Turn the main switch off and on.

Update the firmware on the controller.
SM Appendix 2-87
SC800: Overall System
GW
D131/D132/D133