23
12.7 Checking the semiconductors using a resistance meter
Microwave oven shuts down
between 15 - 33 seconds.
Set the microwave oven to test
mode
Set to high power 1 minute.
H97 or H98 appears in the dis-
play and the microwave oven
stops working
Program for 1 minute and per-
form the following test
1
Unplug CN702 connec-
tor and measure the
voltage between the
terminlas
Abnormal
1. Latch switch
2. DPC/Power relay
Normal
Step 2
2
Unplug CN703 connec-
tor and measure the
voltage at Pin 1
Abnormal
DPC
Normal
1. Magnetron
2. Inverter circuit
Diode
Transistor
Digital transistor
A
C
C
C
C
B
B
E
E
E
E
B
B
A
K
K
Forward
Forward
Forward
Forward
Reverse
Reverse
Reverse
Reverse
A - K
B - E
E - B
E - B
B - C
C - B
C - B
C - E
C - E
C - E
Low
Low
Low
10 -30 k
10 -30 k
50 -90 k
40 -60 k
Low
Low
