All codesService call
SC856
USB host error
BController / HDD
Level B — stop, power-cycle may clear
First check
USB host port. Disconnect dongles/card-readers and retry.
What it means
USB host error. Confirm the exact subcode against the FSM for this serial — meaning can shift by generation.
Likely causes
- USB host port. Disconnect dongles/card-readers and retry.
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.