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TM 11-5820-890-30-5
Section V. TROUBLESHOOTING PROCEDURES
Page
Subject
Para
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
Operational Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
Test Precautions and Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
Explanation of Symbols and Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19
Troubleshooting Flowcharts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
ECCM Fill Device, MX-10579/VRC and MX-18290/VRC . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
3-15. GENERAL.
Troubleshooting is performed on a unit that is not operating properly. Use the operational checks in
paragraph 3-17 to determine if a unit is operating properly. If it is not, follow the troubleshooting instructions in
this section.
3-16. TROUBLESHOOTING.
Troubleshoot the maintenance group using the troubleshooting flowcharts as follows:
3-25
3-25
3-26
3-46
3-46
3-47
3-86
a.
b.
c.
d.
e.
When a maintenance group is faulty, inspect it for damage. Repair any damage before proceeding
with testing.
Verify the symptom.
Perform the operational check in paragraph 3-17. This will direct you to the
correct troubleshooting flowchart or identify the fault.
Troubleshoot the maintenance group using the flowchart. It will identify the fault. Disassemble the
test adapter as necessary to gain access.
Repair the defective unit.
Follow the procedures in section Vl or indicated chapters.
Verify the repair.
Repeat the operational check in paragraph 3-17 that failed. If it passes, then
continue with the rest of the operational check. When the operational check is passed, the
maintenance group can be returned to service.
If you suspect a short circuit is the problem, follow these steps:
1.
Using schematic, visually check suspect path for wires pinched against chassis by bolting action of
components or brackets.
2. Use supplied schematic (figure FO-19) and a digital multimeter to check for incorrectly grounded
paths. As an example, the seventh test of the Test Adapter Continuity Checks (table 3-2) should not
give a digital multimeter resistance reading of less than 1 ohm between either J1-CC and TP 12
(ground) or J17-CC and ground. If it does, then a short to ground is located on the J17-CC to J1-CC
path.
3-25
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