Temperature Compensation - Gestetner A193 Service Manual

PCU (PHOTOCONDUCTOR UNIT)

4.4.4 Temperature Compensation

[A]
A193D012-3.wmf
The voltage transferred from roller to drum varies with the temperature
around the drum charge roller. The lower the temperature is, the higher the
applied voltage required.
To compensate for this, the drum charge thermistor [A] detects the
temperature around the drum charge roller. Before the copy job starts, the
CPU monitors the temperature and instructs the high voltage supply board to
supply the correct the charge voltage in accordance with the temperature.
SM 2-29 (A193)