ELECTRONIC CONTROL DIAGNOSTIC MODE AND COMPONENT TESTING
Microwave Combination Wall Oven
n
3-13
Component Testing Chart - Microwave Oven
20
FOR SERVICE TECHNICIAN’S USE ONLY
Inverter
Top
Check wiring to MW inverter:
1.
Unplug the 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.
S
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
Ω
Filament to Chassis
Normal = Infinite
Q
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 >/= 300k
Ω
Abnormal </= 100k
Ω
P31 to P34, P32 to P33
Normal = 0
Ω
Abnormal >/= 100k
Ω
D
Humidity
Sensor
Top
1.
Unplug microwave oven or disconnect power.
2.
Remove the 3-pin connector from MW
Appliance Manager.
3.
Measure resistance across pins 1 and 3
and across pins 2 and 3.
4.
Replace the 3-pin connector from MW
Appliance Manager.
5.
Reassemble all parts and panels before
operating.
6.
Plug in microwave oven or reconnect power.
Normal = 2.8k
Ω
(approximately) at
77°F +/- 10°F
(25°C +/- 10°C)
Abnormal = Infinite.
E
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 = 10k
Ω
(approximately) at
77°F +/- 10°F
(25°C +/-10°C)
Abnormal = Infinite.
P
Grill
Thermostat
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.
Normal = Continuity
Abnormal = Infinite
U
Convect
Thermostat
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 = Continuity
Abnormal = Infinite
B
Component Serviceable
Side
Procedure
Results -
Resistance
Component
Location
Summary of Contents for JMW2427D
Page 38: ...2 16 n Microwave Combination Wall Ovens OPERATION NOTES...
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