Chapter 6. GS AND DEPOT MAINTENANCE

TM 11-6625-924-14

CHAPTER 6

GS AND DEPOT MAINTENANCE

Section I. TROUBLESHOOTING

6 - 1 . General

Troubleshooting the test panel consists of performing

voltage tests on the synchro transmitters and resis-

tance measurements on the entire test panel. Measure-

ments are made through pins of the test cable connec-

tor or binding posts. If an erroneous indication is ob-

served, check the circuit connected to the pin or bind-

6-4. Synchro Transmitter No. 2 Test

ing post at which the erroneous indication was ob-

a. Connect a jumper between pins 2 and 11 of con-

served.

nector P1.

6 - 2 . Test and Additional Equipment Re-

b. Perform the steps in paragraph 6-3a through d,

quired

except, use the following chart instead of the one refer-

a. Multimeter AN/USM-223.

b. Voltmeter, Meter ME-30A/U.

c. 115 VAC, 400-Hertz power supply.

6-3. Synchro Transmitter No. 1 Test

a. Connect alligator clips on the power cable to the

115 VAC, 400-Hertz power source.

b. Set the ADF-VOR-RMI switch to the VOR posi-

tion.

6-5. Resistance Measurements

C. Set the ON-OFF switch to the ON position.

Perform the resistance measurements in the chart

d. Perform the test in the chart below by connecting

below by connecting the AN/USM-223 between the

the ME-30A/U between the pins of connector P1 indi-

pins of connector Pl, binding posts (BP), or test jacks

(TJ) under top cover indicated in column 1, setting

cated in column 1, setting the synchro transmitter No.

switches in column 2 (if indicated), and obtaining the

1 control as indicated in column 2, and obtaining the

readings in column 3.

ME-30A/U indication in column 3. The synchro

NOTE

transmitter No. 1 dial should indicate within 0.1

Switch settings for any measurement are as

previously indicated unless otherwise stated.

degree in each position.

6-1