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c. Drum Temperature Compensation (TH2)
The CPU changes the bias voltage to
compensate for variations in drum
sensitivity that are induced by
temperature changes in the drum
cavity.
The compensation is effective from 5
degrees to 50 degrees (Celsius).
5°C ~ 15°C: 14 V/1°C
15°C ~ 50°C:
d. Rest Time Compensation
The drum sensitivity often drops slightly over the first few cycles of a copy
run. This is because the light from the exposure lamp fatigues the drum
slightly, and it takes a few copies for the selenium to restabilize. The amount
that the sensitivity drops depends on the drum's temperatur and the rest time
between copy runs – the longer the rest time, the greater the change.
The copier increases the bias at the begining of each copy run to prevent
variations in the image density of the first few copies produced. The amount
of bias increase is shown in the two tables below. If the drum temperature is
less than 10 degrees Celsius, no rest time compensation is applied.
When the main switch is turned on, the CPU will automatically select the
greater than two hours rest time compensation level.
T
: 10°C–20°C
D
Copy#
1
Rest Time
0–10s
One step down from previous
states
10s–3min.
3min–50min
30
50min–2hr
30
2hr–
60
•
If the drum temperature is less than 10 degrees Celsius, no rest time
compensation is applied.
6 V/1°C
2
3
4–5
30
0
0
30
30
0
30
30
30
Bias
voltage
Base Level
T
: 20°C–45°C
D
Copy#
6–10
Rest Time
0–10s
10s–3min
0
3min–50min
0
50min–2hr
0
2hr–
TD: Drum Temperature
- 53 -
1
2
3
One step down from previous states
30
30
30
60
60
30
90
60
60
120
90
90
Drum
4–5
6–10
0
0
30
0
30
30
60
30
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