Ricoh D009 Service Manual page 396

Service Call Conditions
Engine startup error
The BICU fails to respond with the prescribed time when the machine is
turned on.
670 D
Connections between BICU and controller board are loose,
disconnected, or damaged
1. Replace the BICU
2. Replace the controller board
BICU error
The model code from the BICU is not correct when the machine is turned
671 D
on.
Install the correct BICU for this model.
D009/D011/D012/D013/D091/D092 3-28 SM Appendix