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TROUBLESHOOTING GUIDE NN-G61 AR
SYMPTOM
STEP CHECK RESULT
Cause/Corrections
No display when oven is first
pluged in
1
2
3
4
5
Low voltage transformer
(LVT) secondary voltage
IC1-pin1voltage
(Q1-E)
IC1-pin27 voltage
(IC2-pin 14)
IC1 pin-2 voltage
Voltage of F1 and F2,
pins 1and 2, 29 and 30 of
display
Abnormal
Normal
Abnormal
Normal
Abnormal
Normal
Abnormal
Normal (30V)
Abnormal
2,5VAC
Transformer
go to step 2
ZD1, Q1
go to step 3
IC2
go to step 4
D11, C11, R51
R50 or S3 and S4
open or short cir-
cuited.
Oven does not accept key
input (Program)
1
Abnormal
Normal
Membrane switch
IC-1
No beep sound
1
IC-1 pin 23 2KHz signal
Abnormal
Normal
BZ1, D12, Q618V
IC-1
1
IC-1 pin 18 voltage while
operation
Abnormal
Normal = 5V
IC-1
RY-1
Power relay 1 does not turn
on even through the program
has been set and the start
pad is tapped
Abnormal IC-1
No microwave oscilation at
any power seting
2
1
IC-1 pin 15 and 5 voltage
while operation at high power
Transistor Q2
Normal
pin 5 = 5V
pin 15 = 5V
go to step 2
Abnormal Q3
Normal IC-2, RY-1
Abnormal IC-1
Normal Display
Replace display and check
operation
Dark or unclear display
1
Abnormal Display
Normal IC-1
Replace display and check
operation
segment
1
go to step 5