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TM 11-5820-509-35
Item
Indication
Probable trouble
Procedure
1
Multimeter at A5J7 (fig. 3-4) does
Popover control relay circuits of R1
Proceed to popover distribution
not read +24 volts dc.
or K2, or low voltage circuits of
circuit checks (para 3-5b).
PP-3518/PRC 47 (A51 are
defective.
2
Multimeter at A5J8 (fig. 3-4) does
Low-voltage power circuits or
Proceed to power distribution
not read +20 volts dc regulated.
regulator of PP-3518/PRC-47
circuit checks (para 3-5b ).
(A5) are defective.
3
Multimeter with rf probe at A3J5
Signal Data Translator CV-
Proceed to frequency generation
(fig. 3-4) does not read 1.75
1377A/PRC-47 (A3) defective.
circuit checks (para 3-5b).
volts peak-to-peak.
4
Frequency counter at A3J5 does
Signal Data Translator CV-
Proceed to frequency generation
not read 3502 kHz.
1377A/PRC-47 (A3) defective.
circuit checks (para 3-5c ).
Place POWER-LIGHTS switch on the front of RT-671/PRC-47 to POWER OFF. Connect test equipment for receiver tests (fig.
3-2). Adjust frequency control knobs for reading of 2225 on KILOCYCLES indicator. Adjust signal generator output level to
2.0 microvolts at 2226 Hz. On RT671/PRC-47, rotate VOLUME control to maximum clockwise stop, then place POWER-
LIGHTS switch to POWER ON.
5
Multimeter with rf probe at A2J3
Signal Data Translator CV-
Proceed to receiver circuit checks
(fig.. 3-4} does not read 100
1377A/PRC-47 (A3) defective.
micro-volts rms.
6
Multimeter with rf probe at A2J4
Proceed to frequency generation
(fig. 3-4) does rot read 1.5 volts
1032/PRC-47 (A6) defective.
and/or relay circuit checks (para
rms.
3-5c and/or 3-5f ).
7
Multimeter with rf probe at A1J13
Amplifier-Modulator AM-
Proceed to receiver circuit checks
(fig. 3-4) does not read 0.1 volt
3507/PRC-47 (A2) defective.
rms (1000 Hz approx.)
CAUTION
Before proceeding further, disconnect signal generator and dummy load from ANTENNA
terminal.  Place POWER-LIGHTS switch on the front of RT-671/PRC-47 tom POWER OFF.
Connect the test equipment for transmitter tests (fig. 3-3). Set KILOCYCLES indicator on the
front of RT-671/PRC-47 to 2000. Return POWER-LIGHTS switch to POWER ON, and tune the
power amplifier as follows:
CAUTION
Do not permit the OPR-TUNE switch to remain in TUNE position for more than a few seconds at a
time while the output circuit is being adjusted. Circuit damage can result.
(3) Return the OPR-TUNE switch to OPR.
(1) Place OPR-TUNE switch to TUNE.
Connect audio oscillator to A1J1 (fig. 3-4) and set the
(2) Immediately adjust POWER AMPLIFIER
output level to 0.1 volt rms at 1, 000 Hz.
TUNE controls for maximum indication on XMTR
OUTPUT meter.
Item
Indication
Probable trouble
Procedure
CAUTION
Do not permit CW-FSEC/VOICE switch to remain in the CW-FSK position for mere than a few at a time; output circuit dodge
can result.
8
With CW-FSK/VOICE switch to
High-voltage power supply circuits
Proceed to power distribution
CW-FSK, multimeter at J101
of PP-3618/PRC-47 (A5)
circuit checks (para 3-5b).
(fig 3-5) does not read +65
defective.
volts dc.
9
Multitester with rf probe at an-
Amplifier-Modulator AM-
Proceed to transmitter circuit
tenna simulator does not read
3507/PRC-7 (A2), or
power checks (para 3-5e ).
13.7 volts rms with CW-
amplifier stage defective.
FSK/VOICE switch at CW-
FSK.
NOTE
place CW-FSK/VOICE switch to VOICE, rotate XMTR PWR switch to Hi, and retune the output
circuit to peak the XMTR OUTPUT meter readings.
3-74


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