All codes
Service call
SC221
Laser scan length / sync detection
BLaser / write
Level B — stop, power-cycle may clear
First check
Sister of SC220. Seat the laser unit fully, then LOSU.
What it means
Laser scan length / sync detection. Confirm the exact subcode against the FSM for this serial — meaning can shift by generation.
Likely causes
- Sister of SC220. Seat the laser unit fully, then LOSU.
On-site steps
Parts to have on the truck
- Laser optics unit
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.