Ricoh Pro 8300S - Fusing Temperature NC Sensor (Hot Roller Center) Defective (Sensor 7); Sc576-00

1.SC Codes
181
Error Condition
 Heating roller full-bd ends: T54
 Abnormal high temperature above 270°C is detected from the sensor.
(It is not detected when the fusing lamp relay is disconnected.)
Major Cause
 AC control board is defective (loading triac defective).
 IOB defective (fusing unit control going out of control).
 Thermopile (heating roller full-bd ends) (SEN85) is defective.
Solution
* Execute "Fusing SC Reset" (SP5-810-001) in SP mode every time you replace components.
Be careful not to bend the pins of the connector.
1. Replace the AC control board.
2. Replace the IOB.
3. Replace the thermopile (heating roller full-bd ends) (SEN85).
SC576-00
Error Name
Fusing Temperature NC Sensor (Hot Roller Center) Defective (Sensor 7)
Pattern
A
Error Condition
Abnormal low temperature is detected consecutively.
Major Cause
 Fusing temperature NC sensor (hot roller center) (SEN59) 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 NC sensor (hot roller center)).
2. Replace the IOB.