Drum Temperature Detection Circuit; General Description; Circuit Configuration - Toshiba e-STUDIO182 Service Manual

10.5 Drum Temperature Detection Circuit

10.5.1

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.
10.5.2

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
voltage 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. 10-4
10 - 7
Digital
data
A/D
SoC
converter
e-STUDIO182/212/242
DRUM RELATED SECTION
10