Test

TM 11-6660-266-13

4-7. TEST.

This section provides the performance test procedures for the Power Supply Unit and the 24 VDC Power Supply.

These procedures should be performed after repair of the power supplies to assure that they meet minimum

performance standards.

4-7-1. Power Supply Unit. Testing of the Power Supply Unit can be accomplished with the use of a Model

8840A/AF-05 Digital Multimeter (or equivalent) and 120 VAC, 60 Hz and +28 VDC power sources.

To test the Power Supply Unit, proceed as follows:

TO PREVENT INJURY TO PERSONNEL, ENSURE POWER TO THE

POWER SUPPLY UNIT IS TURNED OFF PRIOR TO TEST SETUP.

a. Set AC and DC PWR circuit breakers to tripped (off) position.

b. Set PROCESSOR power select switch and RDF power switch to OFF.

c. Connect primary AC power to AC IN connector J1 as follows:

PinA-120VAC60Hz

Pin B - AC Return

Pin C - Safety ground

d: Set AC PWR circuit breaker to ON and observe that AC INPUT POWER LED illuminates.

e. Set RDF power switch to ON and observe that RDF LED illuminates.

f. Using Digital Multimeter, check for presence of 120 VAC at RDF connector J6, pins A (hot) and B (return).

NOTE

Actual measured voltage should be the same as input voltage.

g. Set PROCESSOR power select switch to AC ON and observe that PROCESSOR LED illuminates.

h. Using Digital Multimeter, check for presence of 120 VAC at AC connector J4, pins A (hot) and B (return).

NOTE

Actual measured voltage should be the same as input voltage.

i. Using Digital Multimeter, check for 8.5 0.5 VDC at DCT connector J3, pins A (+) and B (-).

j. Set PROCESSOR power select switch and RDF power switch to OFF. Set AC PWR circuit breaker to

tripped (off) position.

4-6