e-STUDIO200L/202L/230/232/280/282 DRUM RELATED SECTION June 2004 © TOSHIBA TEC
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11.4 Drum Temperature Detection Circuit
11.4.1 General description
If the temperature of the drum and its surrounding area becomes too high, the property of the toner
which is recovered by the drum cleaner easily changes. To prevent this, the drum thermistor detects the
surface temperature of the drum. Based on the result, it controls the exhaust fan and internal cooling
fan-1 to cool down the inside of the equipment.
11.4.2 Construction
The configuration of the drum surface temperature detection circuit is shown below. The input voltage
from the drum thermistor is converted by an A/D converter in the Engine-CPU on the LGC board. The
drum thermistor is a device whose resistance decreases as the temperature rises. Namely, the input
voltage to the Engine-CPU becomes smaller along with the rise of the temperature.
Fig.11-4
Drum
thermistor
+5V
DRTHP-1DRTH
LGC board
Engine-CPU
IC22
PC2/AN2
GNDGND
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