The signal at 3ALPl-24-continued

TM 11-5820-695-35

connected through R32 to pin 4 of threshold detector

R25, R27 and R28 and the level is adjusted (R27) to

slightly less than 700 mv. The output signal at U18-2 is

U1B. The signal level at UlB.4 is normally less than 700

mv and for fault status it is greater than 700 mv. A

normally high (open circuit) and +28 vdc through R30

and R33 reverse biases CR7. For fault status the signal

reference signal at U1B-5 is derived from +28 vdc

at U18B-2 is ground and CR7 is forward biased.

through

Change 6 2-139