First check
Count them in SC history. One: cycle power. Many: firmware + disk.
What it means
Logged software exception. A one-shot 990 after a jam is noise. A storm of 990s is firmware/disk.
Likely causes
- Transient
- Firmware
- HDD
On-site steps
Parts to have on the truck
- Firmware
- 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.