TM 5-6675-324-14
i.
Developer OUT/WASTE Developer Indicator Circuit.
The TEOFP signal appears when developer in the reservoir runs low or waste developer
in the cleaning unit receptacle exceeds the prescribed volume. Under normal opera-
tion, waste developer COVF signal is low and light from lamp LA3 shines on CdS2,
keeping its resistance low. When COVF is low, LED204 is off and the output of
Q205-6 = O (TEOFP).
When the waste receptacle is full, light from LA3 is blocked, CdS2 resistance is
high, COVF signal is high, LED204 is on, and Q205-6 = 1. ZD203 holds the input
voltage to 9.1 V. When the developer supply is adequate, the light from lamp LA4 is
blocked by CdS3, so the resistance of CdS3 is high, TEP = O, Q213-7 = O, LED204 is
off, and Q205-6 = O (TEOFP).
3-20
