Read Panasonic NN-GT338MZTE / NN-GT338WZTE / NN-GT338MZPE / NN-GT338WZPE Service Manual Simplified online
5.1. Trouble related to Digital Programmer Circuit
SYMPTOM
STEP
CHECK
RESULT
CAUSE/CORRECTIONS
No display when oven is first plugged
in
in
1
Fuse pattern of D.P.C.
Normal
→Step2
Open
Replace D.P.C. or Fuse
Pattern
Pattern
2
Low voltage transforment (L.V.T.)
secondary voltage
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
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
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
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
segment
1
Replace IC1 and check operation
Normal
IC1
Abnormal
Display
5.2. How to check the semiconductors using an OHM meter
12
NN-GT338M / NN-GT338W
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