Ricoh Pro 8300S - Hardware High Temperature Detection (Sensor 4); Sc568-00

1.SC Codes
177
Major Cause
 Heating roller thermistor (rear) (SEN9) is defective.
 AC control board is defective.
 IOB is defective.
 Harness between the 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 harness (as well as the thermistor).
2. Replace the AC control board.
3. Replace the IOB.
4. Replace the harness between the AC control board and IOB.
SC568-00
Error Name
Hardware High Temperature Detection (Sensor 4)
Pattern
A
Error Condition
 Heating Roller Rear: T44
 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).
 Heating roller thermistor (rear) (SEN9) defective.
Solution
* Execute "Fusing SC Reset" (SP5-810-001) in SP mode every time you replace components, and then
turn the main power OFF and ON.
Be careful not to bend the pins of the connector.
1. Replace the AC control board.
2. Replace the IOB.
3. Replace the heating roller thermistor (rear) (SEN9).