Whirlpool MH2175XSB Service Guide - Page 42

Humidity Sensor, Hood Exhaust Fan Motor

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Humidity Sensor Hood Exhaust Fan Motor 1. Unplug microwave oven or disconnect power. 1. Unplug microwave oven or disconnect power. 2. Remove the 3-pin connector from the electronic control (P1). NOTE: Do not remove the attached resistor, which is used for internal resistance calibration. 3. Measure resistance across pins 1 & 3, and across pins 2 & 3 (ohmmeter scale: Rx1k): • Normal: 2.8k ohms (approximate) at 77ºF (28ºC) +/- 18ºF (-10ºC) • Abnormal: Infinite 2. Remove wire leads. 3. Measure resistance (ohmmeter scale: Rx1): • High Speed-Normal: Red (R) and Blue (BU) wires: 100-200 ohms (approximate); Blue (BU) and Black (BK) wires: 40-100 ohms (approximate) ; Abnormal: Infinite • Low Speed-Normal: Red (R) and Blue (BU) wires: 100-200 ohms (approximate); Blue (BU) and White (W) wires: 80-150 ohms (approximate); Abnormal: Infinite 1 BK W R BK W BU HF Y R 5-4

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5-4
HUMIDITY SENSOR
1. Unplug microwave oven or disconnect power.
2. Remove the 3-pin connector from the elec-
tronic control (P1).
NOTE: Do not remove the
attached resistor, which is used for internal
resistance calibration.
3. Measure resistance across pins 1 & 3, and
across pins 2 & 3 (ohmmeter scale: Rx1k):
• Normal: 2.8k ohms (approximate) at 77ºF
(28ºC) +/- 18ºF (-10ºC)
• Abnormal: Infinite
BK
R
W
1
HOOD EXHAUST FAN MOTOR
1. Unplug microwave oven or disconnect power.
2. Remove wire leads.
3. Measure resistance (ohmmeter scale: Rx1):
• High Speed—Normal: Red (R) and Blue (BU)
wires: 100-200 ohms (approximate); Blue (BU)
and Black (BK) wires: 40-100 ohms (approxi-
mate) ; Abnormal: Infinite
• Low Speed—Normal: Red (R) and Blue (BU)
wires: 100-200 ohms (approximate); Blue (BU)
and White (W) wires: 80-150 ohms (approxi-
mate); Abnormal: Infinite
BU
W
BK
Y
R
HF