Drum Temperature Detection Circuit; General Description; Circuit Configuration - Toshiba e-STUDIO163 Service Manual

11.5 Drum Temperature Detection Circuit

11.5.1

General description

To prevent the print quality from varying depending on the temperature, the temperature of the drum
surface and around the drum is detected by the drum thermistor. Based on the result of the detection,
this circuit corrects the output of the main charger bias, developer bias, transfer bias and separation
bias as well as the output of the auto-toner sensor and the laser.
11.5.2

Circuit configuration

The configuration of the drum surface temperature detection circuit is shown below. The voltage output
from the drum thermistor is converted by the A/D converter in the Main board and is input into the SoC.
The drum thermistor is a device whose resistance decreases as the temperature rises; thus, the volt-
age input to the A/D converter becomes smaller along with the rise of the temperature.
Drum thermistor
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MAIN board
+5V
DRTH-1A
SG SG
Fig. 11-4
11 - 7
Digital
data
A/D
SoC
converter
DRUM RELATED SECTION
11
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