NO OPERATION FOR ANY POSITION OF TEL-RAD-RAD/SPKR SWITCH.

TM 11-5820-477-30

Table 2-3. Troubleshooting, Remote Control Unit (rent).

Malfunction

Test or Inspection

Corrective Action

4. NO OPERATION FOR ANY POSITION OF TEL-RAD-RAD/SPKR SWITCH.

Step 1. Check switch S201 by checking for battery voltage at terminal 11 of component board A201

when switch S201 is in ON position.

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

Step 2. Check for defective capacitor C215.

If defective, replace (paragraph 2-13).

Step 3. Check switch S202 for continuity of switch contacts for each position.

If defective, replace (paragraph 2-14).

5. TELEPHONE COMMUNICATION SIGNALS ARE RECEIVED BUT CANNOT BE TRANSMITTED TO LOCAL

CONTROL UNIT.

Step 1. Check for defective preamplifier (audio amplifier Q201 and Q202) by checking for signal voltage

at terminal 2 of component board A202.

If defective, replace Q201 and/or Q202 (paragraph 2-13).

Step 2. Check connectors P201 and J204 for continuity (pins A, C, H, J).

Replace defective connector(s) (paragraph 2-1 3).

Step 3. Check for defective switch S202. Check continuity of switch contacts 7 and 10.

If defective, replace (paragraph 2-14).

Step 4. Check audio line transformer T201 by checking winding resistance between terminals 1 and 2 of

t r a n s f o r m e r (paragraph 2-5).

I f defective, replace (paragraph 2-13).

Step 5. Check for defective AUDIO connector J201 by checking continuity of connector (all pins).

I f defective, replace (paragraph 2-14).

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

Step 1. Check audio line transformer T201 by checking winding resistance between terminals 3 and 4 of

t r a n s f o r m e r (paragraph 2-5).

I f defective, replace (paragraph 2-13).

Step 2. Check for defective switch S202 by checking continuity of switch (section A, contacts 4, 1,9,

12).

If defective, replace (paragraph 2-14).

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