KitchenAid Whirlpool W11400254 Service Manual page 38

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COMPONENT TESTING (Cont.)
Components
Hood Exhaust Fan Motor
HF NTC Thermistor
AC Line Filter Board
Thermostats
Cavity Thermostats
Magnetron Thermostat
Cooling Fan Motor
FC Motor
FC Ring Heater
FC Thermistor
FC Thermoactuator
Power Resistor
Quartz Grill Heater
n
3-10 Microwave Hood Combination
For Service Technician Use Only
Test/Results
1. Unplug microwave oven or disconnect power.
2. Remove wire leads.
3. Measure resistance:
n High Speed—Normal: Red (RD) and Blue (BU) wires: 70 to 100 ohms (approximate);
Blue (BU) and Black (BK) wires: 30 to 60 ohms (approximate)
n Low Speed—Normal: Red (RD) and Blue (BU) wires: 70 to 100 ohms (approximate);
Blue (BU) and White (WH) wires: 50 to 80 ohms (approximate)
1. If "NTC SHORT, CALL FOR SERVICE" or "NTC OPEN, CALL FOR SERVICE" scrolls on display,
unplug microwave oven or disconnect power.
2. Measure hood thermistor:
n Normal: 10 k ohms ± 5% at 77°F (25°C)
1. Unplug microwave oven or disconnect power.
2. Remove wire leads.
3. Measure resistance:
n Normal: L-IN to L-OUT (coil): Less than 1 ohm; N-IN to N-OUT (coil): Less than 1 ohm
NOTE: Refer to "Parts Layout" for opening and closing temperatures.
1. Unplug microwave oven or disconnect power.
2. Remove wire leads.
3. Measure continuity:
n Normal: Continuity
1. Unplug microwave oven or disconnect power.
2. Remove wire leads.
3. Measure resistance:
n Normal: 40 to 60 ohms (approximate)
1. Unplug microwave oven or disconnect power.
2. Remove wire leads.
3. Measure resistance:
n Normal: 23 to 25 ohms
1. Unplug microwave oven or disconnect power.
2. Remove wire leads.
3. Measure resistance:
n Normal: 9 ± 3 ohms
1. Unplug microwave oven or disconnect power.
2. Remove wire leads.
3. Measure resistance:
n Normal: 17 k ± 20% ohm at 77°F (25°C)
1. Unplug microwave oven or disconnect power.
2. Remove wire leads.
3. Measure resistance:
n Normal: 1.2 k ± 0.5 k ohms
1. Unplug microwave oven or disconnect power.
2. Remove wire leads.
3. Measure resistance:
n Normal: 20 ohms/25 W
1. Unplug microwave oven or disconnect power.
2. Remove wire leads.
3. Measure resistance:
n Normal: 5 ± 1 ohms