Service Guide

For Service Technician Use Only
COMPONENT TESTING
3-18
n
Whirlpool
®
Smart Wall Ovens
Component Serviceable
Side
Procedure  Component

Inverter Top Check wiring to MW inverter:
1. Unplug microwave oven or disconnect power.
2. Visually inspect 4 connectors on the MW
inverter boards, CN701, CN702, CN703,
and E701 to see whether there are signs of
overheang or any signs of failure due to
loose wires, bad crimping, etc.
3. Reassemble all parts and panels before
operang.
4. Plug in microwave oven or reconnect power.
H
Magnetron Top 1. Unplug microwave oven or disconnect power.
2. Remove wire leads. Check that the seal is in
good condion.
3. Measure resistance.
4. Replace wire leads.
5. Reassemble all parts and panels before
operang.
6. Plug in microwave oven or reconnect power.
Filament Terminals
Normal = <1 W
Filament to Chassis
Normal = Innite
K
Line Filter Top 1. Unplug microwave oven or disconnect power.
2. Remove wire leads.
3. Measure resistance.
4. Replace wire leads.
5. Reassemble all parts and panels before
operang.
6. Plug in microwave oven or reconnect power.
P31 to P32, P33 to P34
Normal >/= 300 kΩ
Abnormal </= 100 kΩ
P31 to P34, P32 to P33
Normal = 0 Ω
Abnormal >/= 100 kΩ
F
Humidity Sensor Top 1. Unplug microwave oven or disconnect power.
2. Remove the 3-pin connector from MW ACU.
3. Measure resistance across pins 1 and 3 and
across pins 2 and 3.
4. Replace the 3-pin connector from MW ACU.
5. Reassemble all parts and panels before
operang.
6. Plug in microwave oven or reconnect power.
Normal = 2.8 kΩ
(approximately) at 77°F ±
10°F (25°C ± 10°C)
Abnormal = Innite
D
Magnetron
Thermistor
1. Unplug microwave oven or disconnect power.
2. Remove wire leads.
3. Measure resistance.
4. Replace wire leads.
5. Reassemble all parts and panels before
operang.
6. Plug in microwave oven or reconnect power.
Normal = 10 kΩ
(approximately) at
77°F ± 10°F
(25°C ± 10°C)
Abnormal = Innite
J
Cavity Temp Sensor Rear 1. Unplug microwave oven or disconnect power.
2. Remove wire leads.
3. Measure resistance.
4. Replace wire leads.
5. Reassemble all parts and panels before
operang.
6. Plug in microwave oven or reconnect power.
Normal = 230 kΩ
(approximately)
at 77°F ± 10°F
(25°C ± 10°C)
Abnormal = Innite
G