TEST PROCEDURES
PROCEDURE
NUMBER
COMPONENT TEST
1
MAGNETRON ASSEMBLY
HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE, SO EXTREME CAUTION SHOULD BE
OBSERVED.
DISCHARGE THE .HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR
WIRING.
-.
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.
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.
Power output of the magnetron can be measured by means of a water temperature rise test. This test should only be
used if the preceding test does not indicate a faulty magnetron and there is no defect on the following components
or wiring: silicon rectifier, high voltage capacitor and power transformer.
Refer to Microwave Output Power Measurement in GENERAL SERVICE MANUAL on pages 6 and 7.
2 POWER TRANSFORMER TEST
DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR
WIRING
Disconnect the primary input terminals and measure the resistance with an ohmmeter. Check for the continuity
of the coils with an ohmmeter. On the RX1 scale, the resistance of the primary coil should be approximately 1 ohm
and the resistance of high voltage coil should be approximately 77 ohms, and the resistance of filament coil should
be approximately 1 ohm. With 220/240 volts A.C. applied to the primary winding, the voltage across the filament
winding should be approximately 3.2 volts A.C. (HIGH VOLTAGES ARE PRESENT TO HIGH VOLTAGE TER-
MINAL, SO EXTREME CAUTION SHOULD BE OBSERVED.)
13
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