First check
After an ADF or SBU swap — harness. Recurring with 181/183 → CIS.
What it means
ADF gate signal (DF-GATE) asserted/negated at the wrong time. Timing between ADF and SBU.
Likely causes
- ADF I/F
- SBU timing
- 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.