Toshiba e-STUDIO200L Service Manual

Also see for e-STUDIO200L: User guide Operator's guide Service manual Service handbook Service handbook

Contents

13© 2004 - 2008 TOSHIBA TEC CORPORATION All rights reserved e-STUDIO200L/202L/203L/230/232/233/280/282/283FUSER UNIT13 - 96) Temperature detection configurationThermistor is a device whose resistance decreases as it detects a higher temperature. Thus its inputvoltage to engine-CPU changes and then engine-CPU judges whether this change is normal orabnormal. If one of the fuser roller thermistors is broken, the control circuit judges that the fuserroller temperature is extremely low and keeps turning the heater lamp ON. As a result, the fuserroller temperature rises, and possibly activates the thermostat which is a safety protection device. Toprevent this in advance, engine-CPU works to detect whether each thermistor is broken or not.Also, the thermistors constantly check the temperature of heater lamp to prevent it from excessiveheating by LGC circuit abnormality or thermistor abnormality. The thermistors automatically turnOFF the power when the temperature of heater lamp exceeds the specified temperature.Fig. 13-6138137 PC4/AN4PC5/AN5Engine-CPUSidethermistorCenterthermistor+5.1V139 PC6/AN6+5.1VEdgethermistor+5.1V