11. TEST AND CHECKOUT PROCEDURES, AND TROUBLESHOOTING

CAUTIONS

1.DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASE FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER.

2.ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD (1 LITER OF WATER IN CONTAINER) IN THE OVEN.

A.TEST PROCEDURES

COMPONENTS

TEST PROCEDURE

RESULTS

HIGH VOLTAGE TRANSFORMER (Wire leads removed)

FILAMENT

WINDING

 

 

PRIMARY

 

 

 

TERMINAL

 

 

1.

Measure the resistance.

 

 

 

(Ohm-meter scale: Rx1 and Rx100)

 

 

 

• Primary winding

Approx.: 0.2 ~ 0.4 ohm

 

 

• Secondary winding

Approx.: 70 ~ 100 ohm

 

 

• Filament winding

Less than: 1 ohm

 

2.

Measure the resistance.

 

 

 

(Ohm-meter scale: Rx1000)

 

 

 

• Primary winding to ground

Normal: Infinite

 

 

• Filament winding to ground

Normal: Infinite

 

 

 

 

MAGNETRON

1.

Measure the resistance.

 

(Wire leads removed)

 

 

(Ohm-meter scale: Rx1)

Normal: Less than 1 ohm

 

 

 

 

• Filament terminal

 

 

2.

Measure the resistance.

 

 

 

(Ohm-meter scale: Rx1000)

Normal: Infinite

 

 

• Filament to chassis

 

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Whirlpool 721.663398 manual Test and Checkout PROCEDURES, and Troubleshooting, Test Procedures Components, Magnetron

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