21
10.5.
Inverter Power Supply
Caution
DO NOT try to repair this inverter power supply). Replace as a whole H.V. Inverter Unit.
Figure 3
Inverter Power Supply Diagram
10.6.
Inverter Power Supply Unit
Warning
Do not attempt to make any measurements in the high volt-
age 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 func-
tioning.
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 out-
side this range the thermistor is defective and should be
replaced.
NOTE: When measuring the resistance of the thermistor dis-
connect 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 ther-
mistor resistance.
Summary of Contents for NN-A750WB
Page 3: ...3 3 Control Panels...
Page 7: ...7 5 Schematic Diagram 6 Wiring Diagram...
Page 11: ...11 Grill and Microwave Duty Cycles Figure 2 Grill Convection And Microwave Duty Cycles...
Page 12: ...12 Figure 3...
Page 18: ...18 One screw to remove the grill bracket Figure 11 Removing the grill element Figure 12...
Page 24: ...24 Troubleshooting Fuse is blown Figure 2 Troubleshooting Other problems Figure 3...
Page 26: ...26 13 Digital Programmer Circuit Troubleshooting Guide How to test the semiconductors...
