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 SB 740-91-01
4. Electrical Tests
The following tests are to be performed, using the applicable data sheet (figure B-17), for the Amplifier, Audio Frequency,
AM-1280/VRC
Step
Settings and Instructions
Normal Indication
1
Output and distortion
(a) Connect the equipment in accordance with
(b) Adjust the output of the PP-1104/U for
25.5 VDC.
(c) Set AM-1780/VRC controls as follows:
The power indicator
(1) Main power. Norm
should light.
(2) Installation. Other
(3) Power circuit breaker. On
(d) Adjust the output of the AN/URM-127 to
0.22 V. Use the ME-30/U to measure
the output voltage of the AN/URM-127
throughout this procedure.
(e) Adjust the TS-723/U to measure voltages.
The voltage should not
Record the voltage across the 100 ohm
be less than 10 VDC.
resistor.
(f) Readjust the TS-723/U to measure
Distortion should not ex-
distortion. Record the distortion
ceed 10 percent.
across the 100 ohm resistor.
(g) Readjust the TS-723/U to measure voltages.
(h) Connect AN/URM-127 to terminals K and A
(ground) of Test Cable No. 1 connected
to J510. Readjust AN/URM-127 output
voltage, if necessary, to 0.22 VAC.
(i) Record the TS-723/U voltage indication
The voltage should not
be less than 10 VAC.
(j) Connect AN/URM-127 to terminals K and A
(ground) of Test Cable No. 2C connected
to J503. Readjust AN/URM-127 output
voltage, if necessary, to 0.22 VAC.
(k) Record the TS-723/U voltage indication
The voltage should not
be less than 10 VAC.
(1) Turn the AM-1780/U power circuit
breaker to OFF.
(m) Connect Test Cable No. 2C to J505 with
AN/URM-127 still attached to terminals
K and A.
B-67
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