b. Repair.
The only repair authorized at organizational level is
resoldering a wire to a connector pin in a cable or audio accessory and
cleaning contact surfaces, such as the screw threads of the antenna
sections.
PRACTICE EXERCISES:
8.
How many antenna systems are furnished with an AN/GRC-213 mounted on
an M151A1 vehicle?
a.
two
b.
three
c.
four
d.
only the vehicle whip
9.
What sound would you hear with
the
AN/GRC-213
turned
on
and
the
frequency set at 01.0000 MHz?
a.
1-kHz tuning tone
b.
beeping 1-kHz tone
c.
clicking sound in the handset
d.
receive noise in both the handset and the speaker
10.
If a fault tone is not present when you turn on the AN/GRC-213,
receive noise is not present in the speaker, or the handset and
amplifier-power supply power light is not on, you would next--
a.
remove the power cable from J101 and check for 24 to 32 volts DC
between pins A and B of the cable.
b.
remove the audio cable from the lower audio connector of the RT
and check for 1 to 3 volts AC between pins A and B of the
connector.
c.
remove the handset from the upper audio connector on the RT with
the PTT button closed and check for a short (O ohms) between pins
A and C of the handset cable.
d.
check for 24 volts DC at pins A and F of J104.
11.
At turn-on if a fault tone is not present in the handset and receive
noise is heard in both the handset and the speaker, you reset the
controls and close the PTT switch.
If a tune-up tone is present in
the handset but a fault tone is not present in the handset or speaker,
you would--
a.
disconnect the cable from J203 on the rear of the switching unit
and check for 12.5 to 31 watts on the wattmeter.
b.
disconnect the cable from J202 on the rear of the switching unit
and check for 12.5 to 31 watts on the wattmeter.
c.
close the PTT switch and whistle into the handset mouthpiece
while listening for a sidetone in the handset earpiece.
d.
remove the handset from the upper audio connector on the RT with
the PTT closed and check for a short (O ohms) between pins A and
C of the handset cable.
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