TRANSFORMER, RECTIFIER, CAPACITORS, AND HARNESS.

TM5-412038314

4-32.

TRANSFORMER, RECTIFIER, CAPACITORS, AND HARNESS.

The transformer rectifier and capacitors C1 and C2 are located

behind the junction box in the upper front left corner of the unit.

Disconnect input power from the air conditioner

before performing maintenance on any part of the

The voltages used can be lethal.

electrical system.

Inspect.

(1) Disconnect power at the power source.

(2) Remove top front cover (para 4-11).

(3) Remove junction box and control module (para 4-21 and

4-27).

(4) Check that solder connections and terminals are tight and

in good condition.

(5) Check that harness wires have no cuts, broken wires, or

frayed insulation.

(6) Check that attaching hardware is tight and in good

condition.

(7) Inspect electrical parts for obvious damage such as

cracks, evidence of overheating and broken terminals.

(8) Replace all damaged or broken parts.

Test.

(1) Transformer T1.

(a) Tag

and disconnect leads.

Do not remove jumper between

Check for continuity across the

pins 3 and 4 on

transformer.

primary winding

pin 2 to pin 5 and across the secondary winding pin

7 to pin 8.

either winding is open, replace transformer.

(b) Check for shorts between one terminal of each winding

and transformer case and also between one primary terminal and one

secondary terminal using an insulation tester, megger or multimeter

on high ohms setting.

Replace transformer if a short is indicated.

4-86