Local Control Unit Troubleshooting

TM 11-5820-477-30

Table 2-3. Remote Control Unit Troubleshooting (cont).

Malfunction

T e s t or Inspection

C o r r e c t i v e Action

8. RADIO SET SIGNALS ARE NOT RECEIVED BY REMOTE CONTROL UNIT INTERNAL LOUDSPEAKER

(cont).

Step 3. Check for defective power amplifiers Q206 and Q207 by checking for presence of operating

voltage at terminal 16 of component board A201.

I f defective, replace Q206 and/or Q207 (paragraph 2-13).

Step 4. Check for defective transformer T203 by checking resistance of transformer windings

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

Step 5. Check for defective loudspeaker by checking continuity of loudspeaker voice coil.

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

Step 6. Check for defective switch S202 by checking continuity of switch (section B, contacts 10 and 8).

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

Step 7. Check for defective relay K201 by checking continuity of relay (contacts 1,4 and 2).

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

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

Step 1. Check for defective oscillator Q204 by checking for presence of operating voltage at

terminal 4 of component board A201.

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

Step 2. Check for defective audio amplifier Q205 by checking for presence of operating voltage at

terminal 3 of component board A201.

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

Step 3. Check for defective audio line transformer T201 by checking resistance of transformer

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

Step 4. Check for defective capacitor C214.

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

2-7. Local Control Unit Troubleshooting

Table 2-4 lists troubleshooting procedures for local control unit C-2329(*)/GRA-39. (Refer to figure 2-3 for the

locations of components identified in table 2-4.)

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