Whirlpool WOC75EC7H, Service Manual

Page: 66 / 84

For Service Technician Use Only
COMPONENT TESTING
3-18
n
Whirlpool
®
Smart Wall Ovens
Component Serviceable
Side
Procedure Results-Resistance Component
Location
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
overheating or any signs of failure due to
loose wires, bad crimping, etc.
3. Reassemble all parts and panels before
operating.
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 condition.
3. Measure resistance.
4.
Replace wire leads.
5. Reassemble all parts and panels before
operating.
6.
Plug in microwave oven or reconnect power.
Filament Terminals
Normal = <1 W
Filament to Chassis
Normal = Infinite
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
operating.
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
operating.
6. Plug in microwave oven or reconnect power.
Normal = 2.8 kΩ
(approximately) at 77°F ±
10°F (25°C ± 10°C)
Abnormal = Infinite
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
operating.
6. Plug in microwave oven or reconnect power.
Normal = 10 kΩ
(approximately) at
77°F ± 10°F
(25°C ± 10°C)
Abnormal = Infinite
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
operating.
6.
Plug in microwave oven or reconnect power.
Normal = 230 kΩ
(approximately)
at 77°F ± 10°F
(25°C ± 10°C)
Abnormal = Infinite
G