All codesService call
SC181
CIS lamp abnormal
BScanner / optics
Level B — stop, power-cycle may clear
First check
ADF CIS is a common swap after a noisy ADF or a dropped scanner.
What it means
Contact image sensor lamp/LED failed (ADF CIS or book CIS depending on model).
Likely causes
- CIS LED
- CIS unit
- ADF CIS harness
On-site steps
Parts to have on the truck
Confirm the subcode and part number in the FSM for this serial. Raicoh is a field companion, not a replacement for the book.