Pc Drum Temperature Control - Minolta CF910 Service Manual

1154SBM0703A
7-3.

PC Drum Temperature Control

• PC Drum Heater H3 is installed inside the PC Drum to maintain drum sensitivity and pre-
vent condensation from forming on the drum surface.
• H3 is turned ON or OFF by a temperature-sensitive reed switch installed inside the PC
Drum, keeping the drum surface temperature at 35±5°C.
• H3 is a 50W heater.
• Power to H3 is supplied through the electrodes on the front flange face.
<Temperature-Sensitive Reed Switch>
• Assuming that there is a temperature difference of 2°C between the outside and inside of
the PC Drum, the reed switch is turned OFF when the temperature reaches 37°C and
ON when it becomes lower than 33°C.
<H3 ON Conditions>
• Power Switch S1 is turned ON.
• The temperature-sensitive reed switch is turned ON.
<H3 OFF Conditions>
• The temperature-sensitive reed switch is turned OFF.
• S1 is turned OFF.
• A misfeed or malfunction is reset or a door is opened.
ON
OFF
H3
Temperature-
ON
Sensitive
OFF
Reed Switch
( C)
PC Drum
Surface
Temperature
35
0
PC Drum
H3
Temperature-Sensitive
Reed Switch
Front Flange
M-18
1144M09TCB
Time
Electrodes
1144M025AA