Power Supply Tests

TM 11-6625-2616-14

b. Test Condition.

Power Supply Tests

6-8.

(1) Instrument connected to a 115 vac pow-

a. General. The regulated voltages developed

er source through a variac.

by the power supplies are critical to the proper

performance of every circuit in the AN/GSM-

(2) PWR ON pushbutton in (no warmup

64A. It is, therefore desirable, whenever a mal-

required).

function occurs, to determine that the voltages

(3) VDC pushbutton in.

developed in the power supplies are correct, A

quick check of the voltages at the test points

c. Test Procedure. Connect the leads of the

provided on the printed circuit boards will verify

multimeter (VOM) between instrument SIG

that this is, or is not, the source of the malfunc-

L and the test points set forth in the chart

tion. Since this is so simple to do and since the

below. The chart provides nominal voltage of

power supplies are so important, it is good prac-

each power supply and the acceptable limits.

tice to do this test first before anything else.

During the testing of each supply, vary the

6-5