All codes
Service call
SC547
Zero-cross / fusing temperature does not increase
AFusingCommon field call
Level A — stop, SP reset after repair
First check
Wall power, then PSU zero-cross circuit. Common on a machine that was moved to a bad outlet / UPS.
What it means
Zero-cross signal from AC line missing, or temperature refuses to rise. Power quality or PSU.
Likely causes
- No AC zero-cross (PSU)
- Bad outlet / UPS / generator
- Heater open
- IOB
On-site steps
Parts to have on the truck
- PSU
- IOB
- Fusing unit
SP / reset
SP5-810-001
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.