Table 3-3. Aviation Unit Maintenance Troubleshooting Procedures
(continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 4. Using a multimeter, refer to
Figure 3-2
and perform Test 2 in
accordance with the chart below.
If no failure is detected, the communication cord is working. Replace the earphones or
the microphone as necessary. Proceed to step 5.
If a failure is detected, unscrew the plug cover and check for any loose connections or
cold solder joints. Resolder any defective connections. Proceed to step 5.
NOTE:
Numbers in the Test 2 chart correspond to numbered call-outs in
Figure 3-2
.
Test 2 Chart
FROM
TO
OPEN
SHORTED
1 or 3
2 or 4
5
6
7
9
8
10
Bad
Bad
Bad
Bad
Good
Good
Good
Good
Step 5. Test the communications system by connecting it to a working radio.
Step 6. If the communications system still does not work, replace the
communications cord in accordance with Paragraph 3-3.7 (Page 57).
46
Figure 3-2. Test Points for Test 2
1
2
3
4
7
8
9
10
6
5
Summary of Contents for HGU-56/P
Page 2: ......
Page 4: ......
Page 72: ...66 Figure 4 2 Dual Visor Assembly Plain 2 3 1 11 7 9 4 5 6 10 8...
Page 80: ...74 Figure 4 7 ANVIS Direct Mount Dual Visor Assembly 1 11 7 9 4 5 6 10 8 3 2 12 14 15 13...
Page 84: ...NOTES...
Page 85: ......
