Humidity Sensor; Hood Exhaust Fan Motor - Whirlpool MH3184XPB Service Manual

Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.

HUMIDITY SENSOR

Refer to page 4-5 for the procedure for access-
ing the humidity sensor.
1. Unplug microwave oven or disconnect
power.
2. Disconnect the humidity sensor 3-wire
connector from the control board at P1.
3. Set the ohmmeter to the R x 1K scale.
4. Touch the ohmmeter test leads to sensor
connector pins 1 and 3, and then 2 and 3.
The meter should indicate approximately
2.8 KΩ @ 77°F (25°C).
WARNING
Electrical Shock Hazard

HOOD EXHAUST FAN MOTOR

Refer to page 4-8 for the procedure for access-
ing the hood exhaust fan motor.
1. Unplug microwave oven or disconnect
power.
2. Disconnect the hood exhaust fan motor
wire connector from the main harness.
3. Set the ohmmeter to the R x 1 scale.
4. Touch the ohmmeter test leads to the
following hood exhaust fan motor plug
pins:
High Speed: Red and blue wires = 79 to
119 Ω.
High Speed: Blue and black wires = 22 to
43 Ω.
Low Speed: Red and blue wires = 79 to
119 Ω.
Low Speed: Blue and white wires = 43 to
62 Ω.
5-2