Ricoh M281 Series - Page 473

Service Call 501-582
SM 6-35 D255/D256/M281/M282
Troubleshooting
SC No. Type Error Name/Error Condition/Major Cause/Solution
SC541-00 D Fusing Thermistor (Center) Disconnected Error
Input from fusing thermistor (center) is 1019 or more (A/D value)
continuously for 4 seconds.
 Connector pin defective
 Triac defective
 Fusing unit defective
 Fusing thermistor connection PCB defective
 IOB defective
 Fusing thermistor (center) defective
 Fusing thermostat defective
 PSU 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.