TM 32-5835-005-14 & P
8-15. Performance Standards.
d. To check AGC feed, a 1 KHz tone at
0dB into RCVR of a channel and deter-
Upon completion of troubleshooting and
mine that +7dB (1.74VRMS across 600 OHMS)
necessary repair actions, unit shall
is present at the HEADPHONE jack when
be tested in accordance with operational
AGC is switched in.
test procedures (para.8-34.) which will
provide a direct go-no-go basis for
e. Increase the input by 15dB and
rejecting or passing the repaired
determine that the output increase by
equipment.
no more than 3.0 dB.
f. If desired readings are not ob-
tained, probable defects are: board
A1A3 defective or AGC - MAN switch
defective.
g. If one or both amplifier channels
oscillate, probable cause is due to
use of extender card for Record/Repro-
duce board A1A3. This is expected
due to the increase in lead length
and the unshielded nature of the ex-
tender. Oscillation should stop
when extender is removed, a faulty cap-
stan control board (A1A5), or faulty
relays on the preamlifier (A1A8) can
also cause this oscillation.
h. If meters fail to indicate, yet
unit operation is normal, then meter
may be open or movement stuck. Check
also for open wires to the meter.
8-7
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