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31 December 1992
QUENCHING
7.
QUENCHING
[B]
[A]
+24 V
Quenching Lamp
Main Board
CN104
-B8
24
(-B9)
After the drum is cleaned by the cleaning blade, light from the quenching
lamp neutralizes any charge remaining on the drum. The quenching lamp
turns on and off at the same time as the main motor.
The quenching lamp consists of two PCBs containing 49 LEDs (light emitting
diodes) each. The LEDs output light in the 660 nm to 700 nm (red) range.
The main board turns on the quenching lamp LEDs by dropping CN104-B8
and CN104-B9 to 0 volts. The two PCBs have identical circuits (shown
above).
2-35
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