Electrolux # Service-Handbuch - Seite 16

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GLMV169GSB

GLMV169GBB

GLMV169GQB

PLMVZ169GCB/C

PROCEDURE

LETTER

MAGNETRON ASSEMBLY TEST

. Disconnect the power supply cord, and then remove outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check

across the magnetron filament leads should indicate less than ohm.

5. To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads

and chassis ground. This test should indicate an infinite resistance. If there is little or no resistance

the magnetron is grounded and must be replaced.

6. Reconnect all leads removed from components during testing.

7. Reinstall the outer case (cabinet).

8. Reconnect the power supply cord after the outer case is installed.

9. Run the oven and check all functions.

MICROWAVE OUTPUT POWER

The following test procedure should be carried out with the microwave oven in a fully assembled condi-

tion (outer case fitted).

HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE, SO EXTREME CAUTION SHOULD

BE OBSERVED.

Power output of the magnetron can be measured by performing a water temperature rise test. This

test should only be used if above tests do not indicate a faulty magnetron and there is no defect in the

following components or wiring: silicon rectifier, high voltage capacitor and power transformer. This test

will require a 6 ounce (453cc) measuring cup and an accurate mercury thermometer or thermocouple

type temperature tester. For accurate results, the following procedure must be followed carefully:

. Fill the measuring cup with 6 oz. (453cc) of tap water and measure the temperature of the water

with a thermometer or thermocouple temperature tester. Stir the thermometer or thermocouple

through the water until the temperature stabilizes. Record the temperature of the water.

2. Place the cup of water in the oven. Operate oven at POWER 0(HIGH) selecting more than 60

seconds cook time. Allow the water to heat for 60 seconds, measuring with a stop watch, second

hand of a watch or the digital read-out countdown.

3. Remove the cup from the oven and again measure the temperature, making sure to stir the

thermometer or thermocouple through the water until the maximum temperature is recorded.

4. Subtract the cold water temperature from the hot water temperature. The normal result should be 29.2

to 54.2

and tested for the required time period the test results will indicate if the magnetron tube has low

power output (low rise in water temperature) which would extend cooking time or high power output

(high rise in water temperature) which would reduce cooking time. Because cooking time can be

adjusted to compensate for power output, the magnetron tube assembly should be replaced only if

the water temperature rise test indicates a power output well beyond the normal limits. The test is

only accurate if the power supply line voltage is 20 volts and the oven cavity is clean.

POWER TRANSFORMER TEST

. Disconnect the power supply cord, and then remove outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Disconnect the primary input terminals and measure the resistance of the transformer with an

ohmmeter. Check for continuity of the coils with an ohmmeter. On the R x scale, the resistance

of the primary coil should be less than ohm and the resistance of the high voltage coil should be

approximately 83.2 ohms; the resistance of the filament coil should be less than ohm.

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

7. Reconnect the power supply cord after the outer case is installed.

8. Run the oven and check all functions.

TEST PROCEDURES

F(6.2 to 30.

C) rise in temperature. If the water temperatures are accurately measured

COMPONENT TEST