Section III TROUBLESHOOTING - TM-11-6625-2976-400062

TM 11-6625-2976-40

Section Ill TROUBLESHOOTING

Page

Para

Subject

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-8

Troubleshooting Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

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2-6. GENERAL.

This section contains a troubleshooting table which will help you diagnose faults in the test set. The

troubleshooting table is designed to isolate faults in response to specific performance problems noted

during performance testing in section 1 of this chapter.

The troubleshooting table does not isolate every possible defect. If you are unable to find the reason

for a performance test failure, refer the test set to a higher level of maintenance.

2-7. TROUBLESHOOTING TABLE.

The troubleshooting table is used in the following manner.

1. Go to MALFUNCTION item number referred to in performance test.

2. Perform TEST OR inspection step 1.

3. if CORRECTIVE ACTION is taken, repeat performance test (para 2-5).

4. if no CORRECTIVE ACTION is taken, go to next step.

5. Repeat procedure. Do all steps in sequence.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. No frequency or no power at output.

Check coaxial cablie connections between appropriate rf module and antenna

Step 1.

jack (FO-2). If ok, go to step 2.

Replace defective cables. Tighten loose connections. Recouple bad

connections.

Check voltage at P1 XTAL pin inputs to appropriate rf module (FO-3).

Step 2.

If voltage is correct, replace rf module (para 2-18).

NOTE

If checking GS mode, replace GS/UHF rf module A2 and repeat performance test. If

problem still exists, replace GS/VHF rf module A3.

If checking MB mode, replace MB rf module Al and repeat performance test. If problem

still exists, replace MB impedance Matching Network A7.

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