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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
3. ENGINE SPEED DOES NOT ADJUST OR RUNS ROUGH IN MANUAL MODE.
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 may result in death or serious injury of personnel.
Step 1
Attempt to adjust speed at manual SPEED CONTROL knob on the pressure controller (item 1, Figure
2-1) while noting if the fuel control linkage is responding. If no response is noted go to step 5.
Step 2
Check for combustion of fuel and air in accordance with steps 3 through 7 of Malfunction 2.
Step 3
Check valve clearance adjustment (paragraph 4.10.23).
Adjust valve clearance (paragraph 4.10.23) as required.
Step 4
Notify Direct Support Maintenance.
Step 5
Disconnect the branched cable assembly (item 15, Figure 4-52) from the magnetic pickup, the actuator
controller and the pressure controller and check cable for continuity and short circuits.
Replace cable assembly (paragraph 4.14.1) if defective.
Step 6
Check Magnetic pickup (Step 12, Malfunction 2).
Replace pickup (paragraph 4.14.3) if defective.
Step 7
Test for continuity of wiring from pin E of right hand connector on pressure controller (Figure 4-53) to
wiper contact of mode switch (green wire) and for resistance across potentiometer at pins B and C of 4
to 6 Ohms.
Replace pressure controller (paragraph 4.14.2) if correct continuity/resistance is not indicated.
Step 8
Start system, open cover (item 6, Figure 4-53) on pressure controller and check for 4 volts on
potentiometer(Manual Speed Control Switch) contact (black wire) of 8 Vdc and for 4 Vdc on white wire
on potentiometer
a. Replace pressure controller (paragraph 4.14.2) if incorrect value is indicated.
b. Replace control box (paragraph 4.14.4), if incorrect voltage is indicated.
Change 1 4-10.5
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