3.4 TEMPERATURE COMPENSATION
The applied voltage varies with the temperature around the drum charge
roller. The lower the temperature is, the higher the applied voltage required.
This affects the drum charge efficiency.
To compensate for these characteristics, the drum charge thermistor [A]
detects the temperature around the drum charge roller. Before the copy job
starts, the drum charge thermistor contacts the drum charge roller, T/H
correction for the first copy uses the temperature detected while the drum
charge thermistor contacts the drum charge roller. After the copy job starts,
the thermistor is away from the drum charge roller. After the 2nd copy, T/H
correction uses the temperature detected while the drum charge thermistor
is away from the drum charge roller. Using the detected temperature, T/H
correction is performed. (See "T/H correction" in the Process Control section
for details.)
To avoid low drum charge efficiency for the first copy after the main switch is
turned on, there is a drum heater [B] located over the drum and drum charge
roller. This heater is turned on while the copier main switch is turned off. It
keeps the temperature around the drum and drum charge roller over 15
°
C.
For this heater to operate, the power cord of the copier must be plugged in
even when the main switch is turned off.
Rev. 7/95
[B]
[A]
A156/A160/A162 2-38 STM
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