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Page Title:
Table 4-8. Performance and T7oubleshooting Test for the Control Monitor Assembly -48V/20 Hz Assembly--Continued |
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 TM 11-5895-1123-34
Table 4-8. Performance and T7oubleshooting Test for the Control Monitor Assembly -48V/20 Hz Assembly--Continued
Step
Operation
Normal indication
If indication abnormal
d.
On the test fixture, plug connector P1 into a source of
115 volts 60-Hz power.
e. Connect the UUT to the test fixture as shown in
figure 4-9.
2
Dc Meter Test
a. On the UUT, set the AUDIBLE ALARM switch (S3)
to the DISABLE position.
b. Apply power to the external power supply, and ad-
-48 VDC MONITOR me-
just the power supply output to obtain 48 volts as
ters:
indicated by the digital multimeter.
48 3.0 VDC 0 AMPS
c. On the UUT, place the 20-Hz POWER switches to
The 20-Hz GEN POWER
Check indicator lamps
DS11 and
ON.
ON indicators should light
DS12.
and the -48 VDC MONI-
TOR ammeter should indi-
cate lamp current.
d.
On the UUT, place the 20-Hz POWER switches to
OFF
e. On the UUT, place the AUDIBLE ALARM switch
to ON.
3
Ac Voltage Test:
a. On the test fixture, place the LINE switch (S12) to
the ON position.
b. On the UUT, place the -48 VDC POWER circuit
The POWER ON indicator
Check DS5.
breaker (CB1) to ON.
should light.
c. Adjust the digital multimeter to indicate AC volts.
Voltage range 200 volts.
d. On the test fixture, connect the digital multimeter
115 5.0 vac
between J21 (J17-c) and J24 (J17-h).
e. On the UUT, place the POWER circuit breaker CB1
in the OFF position.
f. On the UUT, place the -48 VDC POWER circuit
The POWER ON indicator
breaker CB2 in the ON position.
should light.
g. On the test fixture, connect the digital multimeter
115 5.0 vac
between J22 (J17-D) and J28 (J17-H).
k. On the UUT, place the POWER circuit breaker CB2
in the OFF position.
4
Fault Test:
a. On the test fixture, set switch1l(S1) to ON and then On the UUT,UNIT 1
Replace DS5.
to OFF
POWER ON indicator
lights.
b. Set switch 2 (S2) to ON and then to OFF
UNIT 2 POWER ON indica-
Replace DS6.
tor lights.
c. Set switch 3 (S3) to ON and then to OFF
UNIT 1 FAULT indicator
Replace DS1.
lights and AUDIBLE
ALARM sounds.
d. Set switch 4 (S4) to ON and then to OFF
UNIT 2 FAULT indicators
Replace DS2.
lights and audible alarm
sounds.
4-19
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