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Page Title:
Table 4-7 Performance and Troubleshooting Test for the 20-Hz Ring Supply Assembly A36 SM-F-935784-Continued |
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 TM 11-5895-1123-34
Table 4-7 Performance and Toubleshooting Test for the 20-Hz Ring Supply Assembly A36 SM- F-935784-Continued
Step
Test setup instructions
Normal indication
If indication is abnormal
j.
On the test fixture, disconnect the leads coming from
20 Hz + 1 Hz
Proceed to 4 below and
perform the realignment
across J1C and J1D and measure the frequency.
procedures for ring
generator A36A1
k.
On the oscilloscope, set the controls as follows:
VERT MODE
CH1
CH1 VOLTS/DIV
.1
AC GND DC
AC
HORIZ DISPLAY
A
LOCK
KNOBS
A TRIGGER TRIG MODE
AUTO
A TRIGGER SOURCE
NORM
A TRIGGER COUPLING
AC
A TRIGGER HOLDOFF
NORM
A and B TIME/DIV
5 ms
l
On the test fixture, attach the clip-on current probe
Unclipped sinewave
Proceed to 4 below to
to the CURRENT loop and observe the waveform
without spikes.
perform the realignment
on the oscilloscope.
procedures for ring
generator A36A 1.
3
Ring Generator A36A2 Online:
a On the test fixture, set the GEN switch for generator
ONLINE lamp 1 is off
Proceed to b below.
1 (leftmost GEN switch) to OFF position and ob-
and 2 is on.
serve the ONLINE lamps. Readjust the LOAD
ADJ, if necessary for 160 ma 5 ma indication on
digital multimeter 2. If indications are normal, pro
ceed to d below.
b. On the UUT, loosen the two quarter-turn fastening
screws on the A3 module circuit card retainer and
remove the card retainer and module A3.
c
On the UUT, connect the RMS voltmeter across ter-
100 - 15VRMS
(1) If voltage is absent,
minals 3 and 5 on TB1 and measure the voltage. If
replace A2 on the
indications are normal, check and replace A3 on the
UUT (fig. FO-6).
UUT (fig. FO-6).
(2) If voltage is present
but not within tol-
erance, proceed to
4 below and per-
form the realign-
ment procedures
for ring generator
A36A2.
d.
On the test fixture, disconnect the leads coming from 100 + 15 VRMS
Perform b and c above.
the frequency counter, and connect the RMS volt-
meter across J1C and J1D and record the voltage.
e.
On the test fixture, set the 20Hz LOAD switch to the
Within + 15% of the
Proceed to 4 below to
OFF position and observe the reading on the RMS
voltage recorded in d
perform the realignment
voltmeters.
above and not to
procedures for ring
exceed 125 VRMS.
generator A36A2.
f.
On the test fixture, set the 20 Hz LOAD switch back on the
ON position.
g.
On the test fixture, disconnect the leads coming from
20 Hz + 1Hz
Proceed to 4 below to perform
the RMS voltmeter and connect the frequency
the realignment procedures for
counter across J1C and J1D and measure the fre-
ring generator A36A2.
quency.
h.
Observe the waveform on the oscilloscope.
Unclipped sinewave
Proceed to 4 below to
without spikes.
perform the realignment
procedures for ring generator
A36A2.
4-15
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