Toshiba e-STUDIO2006 Service Manual page 110

Multifunctional digital systems

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2. Temperature detection configuration

Thermistor is a device whose resistance decreases as it detects a higher temperature. Thus its input

voltage to A/D converter changes and then SoC judges whether this change is normal or abnormal.

If one of the fuser roller thermistors is broken, the control circuit judges that the fuser roller

temperature is extremely low and keeps turning the heater lamp ON. As a result, the fuser roller

temperature rises, and possibly activates the thermostat which is a safety protection device. To

prevent this in advance, SoC works to detect whether each thermistor is broken or not.

Also, the thermistors constantly check the temperature of heater lamp to prevent it from excessive

heating by MAIN circuit abnormality or thermistor abnormality. The thermistors automatically turn

OFF the power when the temperature of heater lamp exceeds the specified temperature.

3. Abnormality detection by the thermistors

The following table shows the conditions judging the fuser roller temperature abnormality and

detecting timing.

Operating state

e-STUDIO2006/2306/2506/2007/2307/2507/2303A/2303AM/2803AM/2309A/2809A

OUTLINE OF THE MACHINE

19 confirmed

21 confirmed

22 confirmed

62 confirmed

Evaluation temperature

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