Ricoh Pro 8300S - Sc547-01; Zero Cross Error (Relay Point Welded)

1.SC Codes
165
Error Condition
Fusing lamps are lit at full power for more than the prescribed time.
Major Cause
 Thermopile (heating roller center) (SEN58) is blocked by a foreign object.
 Thermopile (heating roller center) (SEN58) is dirty.
 Fusing lamp harness is not connected properly.
 Fusing lamps (NA: 997W×3, EU: 1070W×3) (HT1) is defective.
 Thermopile (heating roller center) (SEN58) is defective.
 AC control board is defective.
Solution
* If fusing SC occurs during inspection, execute "Fusing SC Reset" (SP5-810-001) in SP mode every
time SC occurs, and then turn the main power OFF and ON.
1. Inspect the area between the thermopile and fusing belt for any foreign objects like waste paper.
2. Check if the thermopile is dirty. If necessary, clean it.
3. Check if the fusing lamp harness and connector are properly connected.
4. Replace the fusing lamp.
5. Replace the thermopile (heating roller center) (SEN58).
6. Replace the AC control board.
SC547-01
Error Name
Zero Cross Error (Relay Point Welded)
Pattern
D
Error Condition
Commercial frequency is detected even though AC power is not supplied to the fusing unit.
Major Cause
 AC control board is defective.
Fusing relay is damaged (relay point welded)
 IOB is defective
Drive circuit failure in the fusing relay.
Solution
1. Replace the AC control board.
2. Replace the IOB.