Ricoh Pro 8320 - Hardware High Temperature Detection (Sensor 10); Sc553-00; Sc554-01; Software High Temperature Detection (Sensor 2): Thermopile

1.SC Codes
169
SC553-00
Error Name
Software High Temperature Detection (Sensor 2): Thermopile (Heating Roller Ends)
Pattern
A
Error Condition
Abnormal high temperature is detected.
Major Cause
 Thermopile (heating roller ends) (SEN57) is defective.
 AC control board is defective.
 IOB is defective.
 Harness between AC control board and 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 thermopile (heating roller ends) (SEN57).
2. Replace the AC control board.
3. Replace the IOB.
4. Replace the harness between the AC control board and IOB.
SC554-01
Error Name
Hardware High Temperature Detection (Sensor 10)
Pattern
A
Error Condition
 Heating Roller End: T34
 Abnormal high temperature above 290°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 is defective (fusing unit control going out of control).
 Fusing temperature sensor (heating roller end) (SEN87) defective.