GENERAL-continued

TM 11-5820-670-30

2-24. GENERAL. (CONT)

Troubleshooting procedures in this section make use of TMDE and Maintenance Kit, Electronic

Equipment MK-1035/ARC-131. Specific test arrangements are given for each procedure. A prelimi-

nary status condition for the maintenance kit is set up and then changed as required to perform

troubleshooting procedures.

Complete descriptive data and instructions for operating the maintenance kit are given in TM 11-6625-

1610-12. Instructions for operating the radio set control unit are given in TM 11-5820-670-12.

The function of the transmit button (usually part of the aircraft wiring or of the headset-microphone) is

performed by the TRANSMIT switch on the test set (set to MOM or ON position to transmit). An audio

amplifier is built into the maintenance kit so that test audio signals may be monitored when a headset is

plugged into J111 on the kit. The radio antenna is simulated in the maintenance kit by a dummy load

which is connected to the rt output by means of a jumper cable (CG-3370/U (W6)) connected

between J112 and J113 on the kit.

Troubleshooting is performed with equipment covers removed and some modules swung open. In

some procedures, modules, components, or internal connections are removed. See section V of this

chapter for detailed removal and replacement procedures for covers, modules, and chassis-mounted

components.

WARNING

Most procedures are performed with power applied to the equipment. To safeguard

against electrical shock and possible damage to equipment, remove all jewelry.

Measurements of resistance between a test point and ground are used to locate shorts in primary

power circuits. This is done with power off and the rt completely disconnected from any other

equipment. The rt modules are transistorized. Exercise care when taking resistance measurements.

When troubleshooting the rt in the receive mode, it is sometimes necessary to test the response of the

rt on a specific module under operational conditions. This can be done on the test bench by generat-

ing a simulated received signal and substituting this signal for an actual signal and injecting it at a

particular connector pin on test point. When applicable, reference is made to the signal substitution

procedure and signal strength and frequency, point of injection, monitor point, and typical indication

are given.

NOTE

Make certain to understand how to use the flow charts before attempting to troubleshoot

2-52