Humidity Sensor - Panasonic NN-CT890SBPQ Service Manual

11.5. Inverter Power Supply
Caution
DO NOT try to repair this inverter power supply. Replace as a whole H.V. Inverter Unit.
Inverter power supply diagram
11.6. 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
page 27 to determine if the inverter power supply is still func-
tioning.
11.7. Temperature Sensor
A temperature sensor is mounted on the rear of the oven. 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 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.

11.8. Humidity sensor

1. If the auto cooking by humidity sensor is not working,
the microwave will stop running & return to clock display after
18 seconds.
NN-CT890SBPQ
Figure 3
31