All codesService call
SC558
Zero-cross signal abnormal
AFusing
Level A — stop, SP reset after repair
First check
Outlet quality, then PSU. Often paired with 547.
What it means
AC zero-cross missing or unstable. Power or PSU.
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.