Ricoh D017 Service Manual page 420

839 B USB flash error
This is a self-diagnostic error.
The device ID of the on-board
USB flash ROM was not
recognized.
851 D IEEE 1394 I/F Abnormal
IEEE1394 interface error.
SM Appendix
Replace the controller board
IEEE1394 interface board
defective
Controller board defective
3-45 D017/D018/D019/D020/D084/D085
Service Call Conditions