Ricoh Pro 8300S - Fusing Temperature Sensor (Heating Roller Center) Defective (Sensor 9); Sc549-01; Sc550-00; Temperature Low Error (Sensor 1): Thermopile

1.SC Codes
167
Solution
Make sure that the frequency of the commercial power supply is 45 Hz or more.(power supply tester
needed).
In it is 44 Hz or less, the infrastructure must be improved.
SC549-01
Error Name
Temperature Low Error (Sensor 1): Thermopile (Heating Roller Center)
Pattern
D
Error Condition
The temperature drops during paper feed and does not reach the specified temperature.
Major Cause
 Thermopile (heating roller center) (SEN58) is blocked by a foreign object.
 Thermopile (heating roller center) (SEN58) is dirty.
 Fusing lamps (NA: 997W×3, EU: 1070W×3) (HT1) are 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. Replace the fusing lamp (HT1).
4. Replace the thermopile (heating roller center) (SEN58).
5. Replace the AC control board.
SC550-00
Error Name
Fusing Temperature Sensor (Heating Roller Center) Defective (Sensor 9)
Pattern
A