Table 4-8. Performance and T7oubleshooting Test for the Control Monitor Assembly -48V/20 Hz Assembly--Continued

TM 11-5895-1123-34

Table 4-8. Performance and Troubleshooting Test for the Control Monitor Assembly -48V/20 Hz Assembly-Continued

Step

Operation

Normal indication

If indication abnormal

e. Set switch 5 (S5) to ON and then to OFF

UNIT 1 ON LINE indicator

Replace DS3.

lights.

f. Set switch 6 (S6) to ON and then to OFF

UNIT 2 ON LINE indicator

Replace DS4.

lights.

g. Set switch 7 to ON and then OFF

20-Hz GEN PRIME FAULT

Check DS7. Check CR4.

indicator lights and AUDI-

BLE ALARM sounds.

h Set switch 8 (S8) to ON and then to OFF

20-Hz GEN STBY FAULT

Check DSS8. Check CR5.

indicator lights and AUDI-

BLE ALARM sounds.

i. Set switch 9 (S10) to ON and then to OFF

20-Hz GEN PRIME

Check DSI 1. Check R9.

POWER ON indicator

lights.

j. Set switch 10 (S11) to ON and then to OFF

20-Hz GEN STBY POWER

Check DS12. Check R10.

ON indicator lights.

k. .Set switch 11(S9) to ON.

AUDIBLE ALARM sounds.

Check LS1. Check R13. Check

S3.

l. Set switch 11 to OFF.

AUDIBLE ALARM is silent.

m. On the UUT, set AUDIBLE ALARM switch to

AUDIBLE ALARM sounds.

Check LS1. Check R13. Check

TEST.

S3.

o. Set AUDIBLE ALARM switch to ON.

p. Press each indicator lamp.

Each indicator lamp should Check lamp and circuitry that

light when pressed.

does not light.

Control Monitor Timer Test:

a. On the UUT set the 20-Hz GEN POWER switches

to OFF.

b. On the test fixture, connect a cable from the oscillo-

scope CH-1 INPUT to test jack J11 (J16 P).

e. On the oscilloscope, set the controls as follows:

CHANNEL 1 INPUT VOLTSIDIV 10/cm (DC)

TIMEIDIV TRIGGER SOURCE EXT 2 SEC.

d. On the UUT, set the 20-Hz GEN POWER switches

The oscilloscope sweep starts Refer to figure 4-10.

to ON.

across the screen at a level

of 0 to -2 vdc. It should

remain at that level for 10

seconds minimum and then

fold to a level -14 to -20

vdc

e. On the UUT, set the 20-Hz GEN POWER switches

to OFF.

f. Set the AUDIBLEALARM switch to DISABLE.

UUT, the AUDIBLE

ALARM lamp lights.

g. Set the AUDIBLE ALARM switch to ON

UUT, the AUDIBLE

ALARM lamp goes out.

k. Disconnect UUT from test fixture.

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