Ricoh M281 Series Service Manual page 476

Service Call 501-582
SC No. Type
SC549-00 D
D255/D256/M281/M282
Error Name/Error Condition/Major Cause/Solution
Fusing Lamp Disconnected Error
The fusing thermistor (center) temperature does not reach a
temperature of 100 degrees C within 30 seconds after the
machine starts warming up.

Connector pin defective

Triac defective

Fusing unit defective

Fusing thermistor connection PCB defective

IOB defective

PSU defective

Fusing lamp defective

The fusing thermistor (center) detects the temperature that
exceeds 235 degrees C.

The fusing thermistor (center) detects the temperature that
exceeds 195 degrees C in a heater-off state after the fusing
thermistor (center) detects the temperature of 155 degrees
C or less.
6-38 SM