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|  TM 11-5820-401-34-3/0967-LP-432-3060
4-22.
A5300 SQUELCH FILTER ALINEMENT. (CONT)
ALINEMENT PROCEDURE
1.
Lift R-442/VRC A3000 tray (1). (See test setup diagram
.)
2.
Connect MM-100E attenuated probe A (x1 setting) to TP5008 (2), and probe B to ground.
3.
Adjust R5301 (3) until 150-Hz tone is heard on MM-100E speaker.
4.
Adjust AN/GRM-114 A scope VERT control (large knob) and DEV-VERT CAL control (small
knob) to bring trace on center of screen and to obtain Iissajous ellipse. (See test setup
diagram
.)
5. Continue ajusting R5301 until all three of the following conditions are met:
a. 150-Hz tone on speaker is clear and steady, with no tone oscillation.
b. MM-100E voltage is at peak ac value (about 2.5 to 6.0 volts).
c. Lissajous ellipse is steady, with no rotation.
4-133
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