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Table 4-8. TRANSMIT CIRCUITS TEST PROCEDURE (Cont'd) - TM-11-5895-1141-340063
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TM-11-5895-1141-34 Control Radio Channel C-1 0931 (P)/FRC (NSN
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Figure 4-8. Microphone Amplifier/:amp Brightness Circuit Board


TM 11-5895-1141-34
Table 4-9. RECORDER/MONITOR CIRCUITS TEST PROCEDURES
Step
Operation
Normal Indication
1
Repeat steps 1, 2, 3 of the transmit test
procedure.
An output reading of 10 2 dBm should be
2
Connect the mixer amplifier output test
circuit (fig. 4-9) to J104 of the audio
obtained across the 600 ohm load resistor.
unit.
3
Remove the test circuit and replace with
Turn the front panel lamp brightness control
the recorder-monitor test circuit
to maximum. The recorder monitor syllabic
(fig. 4-10). Apply a monitor input
lamp on the audio unit front panel should be
level of -30 dBm by setting the audio
barely visible. If not, adjust R1313, the
oscillator for an output of 49 millivolts
syllabic lamp threshold adjust to achieve
at a frequency of 1000 Hz.
this light level. See figure 4-11.
4
1 Increase the audio oscillator output to
The syllabic lamp should be at full
0.49 v for an input of -10 dBm.
brightness.
5
If the installation instructions call for
Adjust R1313 to achieve barely lighted condi-
a threshold setting other than the -30 dBm
tion of the syllabic lamp.
of step 3 above reset the signal level in
the test circuit.
This completes the recorder/monitor test.
Remove test circuit.
4-18


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