Dacor PMOR3021B Service Manual

Also see for PMOR3021B: Use & care instructions Use & care installation instructions

Contents

Dacor PMOR3021B Service Manual Manual pdf 15 page image

13PMOR3021SPMOR3021BPMOR3021RB INVERTER UNIT TESTTEST PROCEDURESPROCEDURELETTER COMPONENT TEST1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.3. To discharge high voltage capacitor, wait for 60 seconds.4. To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check acrossthe magnetron filament leads should indicate less than 1 ohm.5. To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads andchassis ground. This test should indicate an infinite resistance. If there is little or no resistance themagnetron 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 POWERThe following test procedure should be carried out with the microwave oven in a fully assembled condition(outer case fitted).HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE, SO EXTREME CAUTION SHOULD BEOBSERVED.Power output of the magnetron can be measured by performing a water temperature rise test. This test shouldonly be used if above tests do not indicate a faulty magnetron and there is no defect in the followingcomponents or wiring: inverter unit. This test will require a 16 ounce (453cc) measuring cup and an accuratemercury thermometer or thermocouple type temperature tester. For accurate results, the following proceduremust be followed carefully:1. Fill the measuring cup with 16 oz. (453cc) of tap water and measure the temperature of the water with athermometer or thermocouple temperature tester. Stir the thermometer or thermocouple through the wateruntil the temperature stabilizes. Record the temperature of the water.2. Place the cup of water in the oven. Operate oven at POWER 10(HIGH) selecting more than 60 secondscook time. Allow the water to heat for 60 seconds, measuring with a stop watch, second hand of a watchor the digital read-out countdown.3. Remove the cup from the oven and again measure the temperature, making sure to stir the thermometeror 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 39.2 to63o F(21.8 to 35o C) rise in temperature. If the water temperatures are accurately measured and tested forthe required time period the test results will indicate if the magnetron tube has low power output (low risein water temperature) which would extend cooking time or high power output (high rise in watertemperature) which would reduce cooking time. Because cooking time can be adjusted to compensatefor power output, the magnetron tube assembly should be replaced only if the water temperature rise testindicates a power output well beyond the normal limits. The test is only accurate if the power supply linevoltage is 120 volts and the oven cavity is clean.A MAGNETRON ASSEMBLY TESTWARNING: DO NOT TOUCH THE COMPONENTS OF THE INVERTER UNIT WHILE INVERTERUNIT IS ENERGIZED. IT IS DANGEROUS BECAUSE THIS HAS HIGH VOLTAGECOMPONENTS.CAUTION: DO NOT OPERATE INVERTER UNIT BY ITSELF.CAUTION: DO NOT CONNECT THE OVEN TO WALL OUTLET WITHOUT THE OUTER CASEINSTALLED.Before checking the inverter unit, curry out following 4 steps.1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.3. To discharge high voltage capacitor, wait for 60 seconds.4. Make sure that the wire leads and the connectors are connected correctly to the inverter unit, control unitand magnetron.