Section VII: RADIO INTERFERENCE SUPPRESSION

TM 5-4120-352-14

Table 4-2. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

9. EXCESSIVE NOISE

Step 1. Check evaporator fan or condenser fan for loose blade or loose mountings.

Tighten fan blade on motor shaft. Tighten all mounting hardware.

Step 2. Test for defective or worn evaporator or condenser fan motor.

Replace worn or defective motor (para 4-38 and 4-40).

Step 3. Check to see if compressor motor (para 4-38 and 4-40).

Stop air conditioner and report condition to direct support maintenance.

RADIO INTERFERENCE SUPPRESSION

Section VII.

power source. Capacitors (fig. 4-1) are located across

4 - 1 3 . General Methods Used to Attain

the rectifier terminals.

Proper Suppression.

Essentially, suppression is attained by providing

a low resistance path to ground for the stray cur-

4-15. Replacement of Capacitor.

rents. Methods used include shielding ignition and

a. Removal.

high frequency wires, grounding the frame with

(1) Remove front top cover of air conditioner.

bonding straps and using capacitors and resistors.

(2) Remove 7 screws and lockwashers from

front of control module assembly. Pull control mod-

ule assembly forward as far as allowed by attached

4-14. Interference Suppression Com-

wires.

ponents.

(3) Disconnect capacitor (fig. 4-1 from termi-

The control module, junction box and electrical

nals 1 and 3 or 2 and 4 of rectifier.

system components are grounded to the housing.

the housing is connected to a ground wire in the

4-6