Test Procedure - Viking VCSO210SS Service Manual

VCSO210SS
MAGNETRON ASSEMBLY TEST
1. Disconnect the power supply cord, and then remove the outer case and the back plate assembly.
2. Open the door and block it open.
3. Wait for 60 seconds to discharge the high voltage capacitors of the inverter unit.
4. Disconnect the high voltage wire from the magnetron terminal with insulated pliers.
5. Make the terminal (metal part) of the high voltage wire contact to the magnetron body with insulated pliers.
6. Now, the capacitors of the inverter unit are discharged.
WARNiNG: Use the pliers that the portions of their handles are insulated completely to avoid an
electric shock.
7. 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 1 ohm.
8. 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.
9. Reconnect all leads removed from components during testing.
10.Reinstall the outer case and the back plate assembly.
11.Reconnect the power supply cord after the outer case and the back plate assembly are installed.
12.Run the oven and check all function.
1. MiCROWAvE OUTPUT POWER
The following test procedure should be carried out with the oven in a fully assembled condition (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 inverter unit or wiring. This test will require a 16
ounce (453cc) measuring cup and an accurate mercury thermometer or thermocouple type temperature tester. For accurate
results, the following procedure must be followed carefully:
1. Fill the measuring cup with 16 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
stabi lizes. Record the temperature of the water.
2. Place the cup of water in the oven. Operate oven at 100% power 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 21.6 to 40°F(12 to
22.3°C) rise in temperature. If the water temperatures are accurately measured 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 120 volts and the oven cavity is clean.
PRiMARY iNTERLOCK SYSTEM TEST- checking switches
Before checking switches
1. Disconnect the power supply cord, and then remove the outer case and the back plate assembly.
2. Open the door and block it open.
3. Wait for 60 seconds to discharge the high voltage capacitors of the inverter unit.
4. Disconnect the high voltage wire from the magnetron terminal with insulated pliers.
5. Make the terminal (metal part) of the high voltage wire contact to the magnetron body with insulated pliers.
6. Now, the capacitors of the inverter unit are discharged.
7. Reconnect the high voltage wire to the magnetron terminal after discharging.
WARNiNG: Use the pliers that the portions of their handles are insulated completely to avoid an electric shock.
isolate the switch and connect the ohmmeter to the terminals of the switch (refer to page 32 for each switch
terminal location).
Check all switches. If improper operation is indicated, replace the faulty switch.
9. Reconnect all leads removed from components during testing.
10.Reinstall the outer case and the back plate assembly.
11.Reconnect the power supply cord after the outer case and the back plate assembly are installed.
12.Run the oven and check all function.
TEST PROCEDURES
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