All codesService call
SC866
Log data error
CController / HDD
Level C — logged only
First check
Job log corrupt. Usually noise. Recurring with 853 → disk.
What it means
Log data error. Confirm the exact subcode against the FSM for this serial — meaning can shift by generation.
Likely causes
- Job log corrupt. Usually noise. Recurring with 853 → disk.
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.