All codes
Service call
SC687
HDD communication error
BCommunications
Level B — stop, power-cycle may clear
First check
Reseat the disk. If it clicks or is missing from boot, replace it and reload firmware/apps.
What it means
Controller lost the HDD/SSD at the SATA/eMMC channel.
Likely causes
- Unseated SSD
- Dead disk
- Controller SATA
On-site steps
Parts to have on the truck
- HDD/SSD
- Controller
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.