NN-GT338MZTE, NN-GT338WZTE, NN-GT338MZPE, NN-GT338WZPE - Panasonic Home Appliance Service Manual Simplified (repair manual). Page 12

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5.1. Trouble related to Digital Programmer Circuit
SYMPTOM
STEP
CHECK
RESULT
CAUSE/CORRECTIONS
No display when oven is first plugged
in
1
Fuse pattern of D.P.C.
Normal
→Step2
Open
Replace D.P.C. or Fuse
Pattern
2
Low voltage transforment (L.V.T.)
secondary voltage
Abnormal 0V
L.V.T.
Normal
→Step3
3
IC1 pin23 voltage
Abnormal
Q11, ZD11
Normal=3.3V
IC1, CX320, Display
No key input
1
Membrane switch continuity
Abnormal
Membrane switch
Normal
IC1
No beep sound
1
IC1 pin 29 voltage
Abnormal
IC1
Normal=3.3V
BZ210, Q210
Power relay RY4 does not turn on
even though the program had been set
and the start pad is tapped
1
IC1 pin 26 voltage while operation
Abnormal
IC1
Normal=3.3V
→Step2
2
Collector of Q229 voltage
Abnormal
Q229
Normal 0.7V
RY4
No microwave oscillation at any power
1
IC1 pin 1 voltages while operation at high
power
Abnormal
IC1
Normal=3.3V
→Step2
2
Collector of Q220 voltage
Abnormal
Q220 and /or Q225
Normal 0.7V
→Step3
3
Short circuit between collector and emitter
of Q220
Still not turn on
RY1, Q225
RY1 turns on
Q220
Dark or unclear display
1
Replace display and check operation
Normal
Display
Abnormal
IC1
Missing or lighting of unnecessary
segment
1
Replace IC1 and check operation
Normal
IC1
Abnormal
Display
5.2. How to check the semiconductors using an OHM meter
12
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