All codes
Service call
SC131
F-GATE asserted during shading
BScanner / optics
Level B — stop, power-cycle may clear
First check
ADF gate during book shading — usually a noisy ADF I/F or CIS.
What it means
F-GATE asserted during shading. Confirm the exact subcode against the FSM for this serial — meaning can shift by generation.
Likely causes
- ADF gate during book shading — usually a noisy ADF I/F or CIS.
On-site steps
Parts to have on the truck
- ADF I/F
- CIS
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.