All codes
Service call
SC412
Exposure potential Vpl adjustment error
BTransfer / HV
Level B — stop, power-cycle may clear
First check
Same as SC411 — PCU/charge first, laser only if 220/240 are also logging.
What it means
Exposure potential adjustment failed. Charge unit / PCU, sometimes laser.
Likely causes
- Charge unit
- PCU
- LOSU
On-site steps
Parts to have on the truck
- Charge unit / PCU
- LOSU
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.