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|  TM 11-5820-670-30
2-30. AUDIO LEVEL ADJUSTMENT. (CONT)
CONTROL AND SWITCH SETTINGS
EQUIPMENT
CONTROL OR SWITCH
POSITION/SETTING
TS-2575/ARC-131
Mode Switch
T/R
VOL
fully clockwise
SQUELCH
DIS
FREQ sel
60.05
AN/URM-127
amplitude control
0
output frequency
1000 Hz
AN/URM-103
Function selector
EXT MOD
output
10 microvolt
ADJUSTMENT PROCEDURE
1.
Adjust AN/URM-127 for 8 kHz deviation as indicated on AN/URM-103 modulation meter.
2.
Set TS-723A/U function switch to METER.
Tune AN/URM-103 frequency to 60.05 MHz as indicated on TS-723 A/U meter.
3.
4.
On the A4000 assembly, using screwdriver, remove screw on module A4300 cover and remove
cover.
EL1AT238
5.
Monitor voltage at TP5512 on audiofrequency amplifier assembly using multimeter ME-26B/U,
while adjusting R4304 on A4300 module to provide a 0.775 volt indication.
Install cover on module A4300.
6.
7.
On A5500 assembly, adjust potentiometer R5405 on module A5400 for a reading of 2.8 volts
on TS-723A/U meter connected at Hl-LO jack J107 on TS-2575/ARC-131.
2-133
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