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TM 10-4320-343-14
Table 4-2.1. Unit Troubleshooting Table (Model 350 PAFN). (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Failure to heed these warnings may result in death or serious injury of personnel.
Step 1
Remove and check light bulb(s) (paragraph 4.13.10) of none-functioning light assembly.
Replace light bulb(s) (paragraph 4.13.10) if defective.
Step 2
Test control panel (paragraph 4.13.2.1)
Repair control panel (paragraph 4.13.3 through 4.13.10) if defective.
Step 3
Test system wiring (paragraph 4.12.4.1).
Replace system wiring harness (paragraph 4.12.5.1)or repair/replace individual wires as required.
8. INOPERABLE TACHOMETER/HOURMETER
WARNING
Do not smoke or use spark or flame producing equipment while troubleshooting.
Move equipment off line and have a fire extinguisher at hand when troubleshooting
involves electrical circuits.
Failure to heed these warnings can result in death or serious injury of personnel.
Step 1
Remove belt cover (paragraph 4.10.6) and check for worn, loose or broken alternator belt (item 4,
Figure 4-11)
Adjust or replace belt (paragraph 4.10.7).
Step 2
Start system and check for 12 Vdc at + (positive) and G (ground) terminals of tachometer/hourmeter
and for approximately 5 - 8 Vac at IN terminal of tachometer.
a. If voltage is available at contacts, replace tachometer/hourmeter (paragraph 4.13.5).
b. If less than 3 Vac at IN contact, replace alternator (paragraph 4.10.12).
Step 3
Test system wiring (paragraph 4.12.4.1).
Repair or replace system wiring harness (paragraph 4.12.5.1).
Step 4
Test control panel (paragraph 4.13.2.1).
Repair control panel (paragraph 4.13.3 through 4.13.10) if defective.
Change 1 4-10.9
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