Welbilt MERRYCHEF conneX Service & Repair Manual page 58

5 Service information
Microwave power test: measuring the microwave power output of the magnetron(s)
Check that the following requirements have been met:
The appliance is cool. This test will not operate at a cavity temperature of 100

NOTE:
The power output is established under IEC 705 standard method which is only workable in laboratory controlled conditions.
The power output is also affected by line voltage under load, so this test is an approximation only.
1. Ensure the cavity is close to ambient temperature.
2. Enter the Service Settings / Tests.
3.
Fill a microwave safe container (glass or plastic) with one litre (1.78 pints) of cool tap water, ideally at 20°C (68°F).
4.
Measure and record the water temperature in the container using a thermometer capable of reading ±0.1
increments.
5.
Place the container centrally into the cavity.
6.
Select 'Microwave Power' from the service settings tests (microwave power 100% for 60 seconds, convection fan at
10%).
1. When the countdown has finished, remove the container from the cavity. Immediately stir with a plastic implement
and measure the water temperature.
2. Calculate the temperature rise of the water (end temperature minus the start temperature).
The temperature rise should be 14.3°C (25.7°F) ±10% for the 1000W (1 magnetron) variant.

The temperature rise should be 28.5°C (51.4°F) ±10% for the 2000W (2 magnetrons) variant.

If the temperature rise is outside these limits repeat test and/or check the microwave circuit and components. A low

reading could be caused by the water container absorbing the energy, in which case an alternative container should
be used.
Replace the faulty HV component if required (see High voltage components in section 5.8).

Note: Opening the door during the test will stop the test. Reselect the test to run again.
3. On completion of the test, specify the result by selecting 'Pass' or 'Fail'.
Merrychef conneX ® service and repair manual
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