Ricoh M281 Series Service Manual page 475

SC No. Type
SC543-00 D
SM
Error Name/Error Condition/Major Cause/Solution
Fusing Thermistor (Center) High Temperature

The fusing thermistor (center) detects the temperature that
exceeds 245 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.

Connector pin defective

Triac defective

Fusing thermistor defective

IOB defective

Connector pin defective
If the I/F connector pins of the fuser unit and the main unit
are deformed owing to foreign materials, replace the
connectors or the units including the connectors.

Triac defective
Disconnect the power cord and check that the resistance
between terminals T1 and T2 of the triac TRA31 and triac
TRA41 on the PSU are several Mega-Ohms and not
shorted. If failed, replace the PSU.

Fusing thermistor defective
Replace the fusing unit.

IOB defective
Replace the IOB.
6-37
Service Call 501-582
D255/D256/M281/M282