Panasonic NN-A750WB, Manual

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Figure 3
10.6. Inverter Power Supply Unit
Warning
Do not attempt to make any measurements in the high voltage
circuitry of the inverter or magnetron.
See troubleshooting of the inverter circuit and magnetron on Figure 4 to determine if the
inverter power supply is still functioning.
10.7. Temperature Sensor
A temperature sensor is mounted on the oven cavity on the right hand side. The resistance
reading across the thermistor should read 300K ohm within a temperature range of 10 to 30
degrees centigrade. This would be the temperature range within a kitchen environment. If the
resistance measured is outside this range the thermistor is defective and should be replaced.
NOTE: When measuring the resistance of the thermistor disconnect the connector from the
digital programmer circuit.
NOTE: If the microwave oven has been operated allow to cool to room temperature before
attempting to measure the thermistor resistance.
11. Measurements and Adjustments
Warning
- For continued protection against radiation hazard, replace only
with identical parts.
- When the 10 amp fuse is blown due to the operation of the short
switch, you must replace the primary latch switch and short
switch. Then follow the installation procedures below.
- Interlock switch replacement - In replacing faulty switches, be sure
mounting tabs are not bent, broken or otherwise deficient in their
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