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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 Troubleshooting Test for the 20-Hz Ring Supply Assembly A36 SM-F-935784-Continued
Step
Operation
Normal indication
If indication is abnormal
q.
On the oscilloscope, set the controls as follows!
VERT MODE
CH1
CH1 VOLTS/DIV
.1
AC GND DC
AC
HORIZ DISPLAY
A
LOCKS
KNOBS
A TRIGGER SOURCE
NORM
A TRIGGER MODE
AUTO
A TRIGGER COUPLING
AC
A TRIGGER HOLDOFF
NORM
A and B TIME/DIV
5 ms
r.
On the test fixture, attach the clip-on current probe
Unclipped sinewave without
Replace UUT.
to the CURRENT loop and observe the waveform
spikes.
on the oscilloscope.
s.
While observing the oscilloscope, adjust
R406 +C.1. ADJ adjustable
Replace UUT.
potentiomer R406 +C.1. ADJ, on the RG101
as described in the test
circuit card of the UUT, in a counterclockwise
setup instruction in the
direction to the point just before the positive
left column.
half cycle of the waveform just begins to flatten
or clip or spikes begin to appear on the waveform.
t.
While observing the oscilloscope, adjust
R411 -C.1. ADJ adjust-
Replace UUT
potentiomer R411 -C.1. ADJ, on the RG101
able as described in the
circuit card of the UUT, in a counterclockwise
test setup instruction in
direction to the point just before the negative
the left column
half cycle of the waveform just begins to flatten
or clip or spikes begin to appear on the waveform.
u.
Apply a modified alkyd cement compound to
R406 and R411 to lock the screw in place.
v.
If ring generator 1 was the UUT, repeat 2 above
or if ring generator 2 was the UUT, repeat 3
above. If indications are still abnormal, replace
the UUT.
4-17
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