PERSONNEL HEATER AND DEFROSTER SYSTEM - TM-9-2320-270-20-10264

TM9-2320-270-20-1

TROUBLESHOOTING - CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

PERSONNEL HEATER AND DEFROSTER SYSTEM

76. HEATER MOTOR DOES NOT WORK.

Turn on heater (TM 9-2320-270-10). Check if heater works only on high or low

Step 1.

speed, or not at all.

If motor works on low speed only, turn heater off (TM 9-2320-270-10)

and go to step 4.

Open instrument panel (page 4-244). If heater works on high speed only, go to

Step 2.

terminal for wire no. 071 (1) on resistor. Set switch (2) on low speed. Using

multimeter set at 30 vdc, put red probe on wire no. 071 terminal and black probe

to good ground.

a. If meter reads voltage, turn heater off (TM 9-2320-270-10) and

replace resistor (page 4-1315).

b. If meter does not read voltage, turn heater off (TM 9-2320-270-10),

close instrument panel (page 4-244), and notify direct support

maintenance.

Close instrument panel (page 4-244). Disconnect motor ground wire (3) from

Step 3.

ground point. Put switch (2) in on position. Using multimeter set at 30 vdc, put

red probe on ground wire and black probe to good ground.

If meter reads voltage, put switch in OFF position and reattach ground

wire to good ground.

Step 4.

With motor ground wire reattached and switch (2) in ON position, go to radio

interference suppressor (4). Using multimeter set at 30 vdc, put red probe on

terminal (5) for wire leading to heater motor and black probe to good ground.

If meter reads voltage, replace heater motor (page 4-1270).

Put heater switch (2) in OFF position. Remove radio interference suppressor (4)

Step 5.

from line. Using multimeter set at RX-1, check capacitor for continuity.

If meter does not read continuity, replace suppressor (page 4-1316).

3-202