All codes
Service call
SC144
SBU connection error
BScanner / opticsCommon field call
Level B — stop, power-cycle may clear
First check
Reseat both ends of the SBU flat cable. Look for a crease.
What it means
Controller cannot talk to the SBU. Almost always a FFC after ADF or scanner work.
Likely causes
- Unseated / creased FFC
- SBU
- Scanner I/F
On-site steps
Parts to have on the truck
- SBU FFC
- SBU
Related codes
Confirm the subcode and part number in the FSM for this serial. Raicoh is a field companion, not a replacement for the book.