All codes
Service call
SC142
White level detection error
BScanner / opticsCommon field call
Level B — stop, power-cycle may clear
First check
Dirty white plate or exposure glass is the #1 field cause. Clean before replacing SBU.
What it means
SBU could not get a usable white level during shading.
Likely causes
- Dirty shading plate / glass
- Lamp weak
- SBU
On-site steps
Parts to have on the truck
- SBU
- Exposure lamp
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.