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TM 11-6625-2976-40
2-7. TROUBLESHOOTING TABLE. (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4. VOR modulation or 9960 fm deviation performance test failure. (Cont)
Test frequency divider output in the following manner.
Step 2.
Connect oscilloscope (time base: 5 ms; vertical: 2v/div; sync: INT) to J16
(FO-4). Verify square wave, 0(base) to 7 (peak) v 1 v amplitude.
Connect frequency counter to J16. Verify frequency 240 0.024 Hz. Connect
oscilloscope to J6 (FO-4). Verify square wave, 0(base) to 6.2 (peak)
v 0.3 v amplitude.
Connect frequency counter to J6. Verify frequency 60 0.006 Hz.
Connect oscilloscope toJ17 (FO-4). Verify square wave, 0 (base) to 6.2
(peak) v 0.3 v amplitude.
Connect frequency counter to J17. Verify frequency 30 *0.003 Hz.
If waveforms, voltages, or frequencies are incorrect, replace circuit
card assembly A6.
Check VOR modulation adjustment (para 2-11).
Step 3.
Adjust VOR section of circuit card assemblyA6 (para 2-11).
If unable to aline, or if test set fails performance test after adjustment,
replace circuit card assembly A6.
5. VOR zero performance test failure.
If error is 45 degrees or more, perform VOR bearing selector alinement
Step 1.
Step 2.
Check setting of A6R72.
With equipment set up as in performance test, adjust A6R72 (FO-4) for
000.00 indication on zifor.
If performance test indicates fault still exists, go to MALFUNCTION item 4, step 3.
Step 3.
6. LOC or glide slope modulation performance test failure.
Perform steps 1 and 2 under MALFUNCTION item 4.
Step 1.
If percent MOD is incorrect, see paragraphs 2-9 and 2-10.
Step 2.
2-36

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