Ricoh Pro 8300S - Abnormal Low Temperature Is Detected Consecutively.; Sc551-00; Thermopile (Heating Roller Ends) Defective (Sensor 2)

1.SC Codes
168
Error Condition
Abnormal low temperature is detected consecutively.
Major Cause
 Fusing temperature sensor (heating roller center) (SEN88) is defective.
 IOB 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. Replace the harness (as well as the fusing temperature sensor (heating roller center)).
2. Replace the IOB.
SC551-00
Error Name
Thermopile (Heating Roller Ends) Defective (Sensor 2)
Pattern
A
Error Condition
Abnormal low temperature is detected for three seconds consecutively.
Major Cause
 Thermopile (heating roller ends) (SEN57) is not connected properly.
 IOB (CN223) is not connected properly.
 Thermopile (heating roller ends) (SEN57) is damaged.
 Thermopile harness is defective.
 IOB 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. Check the connector (thermopile control board connector, relay connector).
2. Check the IOB connector.
3. Replace the thermopile (heating roller ends) (SEN57).
4. Replace the harness.
5. Replace the IOB.