RADIO SET TRANSMlTTER IS NOT ENERGIZED BY REMOTE CONTROL UNIT.

TM 11-5820-477-30

Table 2-4. Troubleshooting, Local Control Unit (cent).

Malfunction

Test or

Inspection

Corrective Action

6 . TELEPHONE COMMUNICATIONS ARE SENT OUT BUT NOT RECEIVED BY LOCAL CONTROL UNIT

(cent)

2 . Check for defective switch S102 by checking continuity of switch (section A rear, contacts 4

Step

and 1).

If defective, replace (paragraph 2-14).

7 . RADIO SET T R A N S M l T T E R I S N O T E N E R G I Z E D B Y L O C A L C O N T R O L U N I T .

Step 1. Check for defective relay K101 by checking for presence of battery voltage at contact 1.

a. If battery voltage is present, set TEL-REMOTE-RADIO switch to RADIO.

b. Press handset push-to-talk switch and check for continuity between pin C of RADIO

connector P101 and ground.

Step 2. Check for defective switch S102 by checking continuity of switch (section A rear, contacts 6 and

8 and section B rear, contacts 10 and 12).

If defective, replace (paragraph 2-14).

Step 3. Check for defective RADIO connector P101 by checking continuity of all pins.

If defective, replace (paragraph 2-14).

8 . RADIO SET TRANSMlTTER IS NOT ENERGIZED BY REMOTE CONTROL UNIT.

Step 1. Check for defective relay K101 using procedure in malfunction 7, step 1.

If defective, replace (paragraph 2-13).

Step 2. Check for defective resonant relay amplifier by checking for presence of operating voltage at

terminals 3, 4, and 5 of component board A102.

If defective, replace amplifier (paragraph 2-13).

Step 3. Check for defective connectors P102 and J104 by checking continuity of connectors

(pins A, D, E, or F).

Replace defective connector(s) (paragraph 2-13).

9 . RADIO SET TRANSMlTTER IS ENERGIZED BY LOCAL CONTROL UNIT BUT SIGNALS ARE NOT

TRANSMlTTED.

Step 1. Check for defective filter FL101 by checking resistance of filter (paragraph 2-5).

If defective, replace (paragraph 2-13).

Step 2. Check for defective switch S102 by checking continuity of switch S102 (section A front,

contacts 11 and 5 and section B rear, contacts 3 and 4).

If defective, replace (paragraph 2-14).

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