Panasonic NN-CT577SEPG, Руководство по обслуживанию

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12.8 Checking the semiconductors using a resistance meter
Power relay (RY2 ) does not
operate 1 IC-1 pin 23 during
operation Abnormal
Normal 5V
2 Create a short circuit
between pin 6 and pin
16 of IC-2 RY2 does not turn on RY2
RY2 turns on
IC-220
No microwave oscillation 1 IC-1 pin 18 and 16
during high power
operation Abnormal IC-1
Normal 18 - 5V
16 - 5V Step 2
2 Q221 transistor
Dark or unclear display 1 Replace display Abnormal Display
Normal IC-1
Missing segments in display Replace IC-1 Abnormal IC-1
Normal Display
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