Table 4-7 Performance and Troubleshooting Test for the 20-Hz Ring Supply Assembly A36 SM-F-935784-Continued

TM 11-5895-1123-34

Step

Test setup instructions

Normal indication

If indication is abnormal

On the test fixture, adjust the LOAD ADJ control for a 160

ma + 5 ma indication on digital multimeter 2.

I. Readjust the power supply, if necessary, for a -48 volts +

0.5 volt indication on digital multimeter 1.

m. On the test fixture set the GEN switch for generator 2

(right-most GEN switch) to the ON position and GEN

switch for generator 1 (leftmost GEN switch) to the OFF

position.

n. Connect the positive lead of digital multimeter 1 to

-46.5 to -48 vac

Check and replace, if

necessary,

terminal 8 of TB1 on the UUT and measure the

CR2 and module A3 on the

voltage.

UUT (fig. FO-6).

On the UUT, remove the positive lead of digital mul-

OV to -1 vdc

Check and replace, if

necessary,

timeter 1 from terminal 8 of TB 1 and connect it to

CR1 on the UUT (fig. FO-6).

terminal 7 and measure the voltage.

On the test fixture, set the GEN switch for generator

1 (leftmost GEN switch) to the ON position and the GEN

switch for generator 2 (rightmost GEN switch) to the OFF

position and push the RESET button.

Disconnect the positive lead of digital multimeter 1

-46.5 to - 48 vdc

Check and replace, if

necessary,

from J1L on the test fixture and connect it to ter-

CR1 and module A3 on the

minal 8 on TBI of the UUT and measure the volt-

UUT (fig. FO-6).

age.

On the UUT, remove the positive lead of digital mul-

0 to -1 vdc

Check and replace, if

necessary,

timeter 1 from terminal 8 on TB1 and connect it to

CR2 on the UUT (fig. FO-6).

terminal 9 on TB 1 and measure the voltage.

Ring Generator A36A I Online.

a. On the test fixture, set the GEN switch for generator 2

(rightmost GEN switch) to the ON position.

b. Turn the power supply off for about 10 seconds and

then back on again.

c. On the test fixture, push the RESET button and

ONLINE lamp 1 is

Proceed to d below.

observe the ONLINE lamps. If indications are normal, -

on and 2 is off.

proceed to f below.

d. 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.

e. On the UUT, connect the RMS voltmeter across ter-

100 + 15 VRMS

(1) If voltage is absent,

replace

minals 2 and 3 on TB I and measure the voltage. If

Al on the UUT (fig. FO-6

indications are normal, check and replace A3 on the

2) If voltage is present but not

UUT (fig. FO-6).

Within tolerance, proceed to 4

below and perform the

realignment procedures for ring

generator A36A1.

On the test fixture, connect the leads from the RMS

100 -+15 VRMS

Perform d and e above.

voltmeter across J1C and J1D and record the voltage.

On the test fixture, set the 20-Hz LOAD switch to

Within _ 15% of the

Proceed to 4 below to

the OFF position and observe the reading on the rms

voltage recorded in step

realignment procedures for ring

voltmeter.

1f above and not to

generator A36A1

and not to exceed 125

VRMS.

On the frequency counter, set the controls as f ollows:

SENSITIVITY (VOLTS RMS)

TIME BASE

FUNCTION

FREQUENCY

On the test fixture, set the 20-Hz LOAD switch back

to the ON position.

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