Read Panasonic NE-1027ZPE / NE-1037ZPE Service Manual online
9.3. Trouble related to Digital Programmer Circuit
SYMPTOM
STEP
CHECK
RESULT
CAUSE/CORRECTIONS
No display when oven is first plugged
in
in
1
Printed fuse pattern of D.P.C.
Normal
STEP 2
Open (NOTE)
Shorted circuit of ZNR,
L. V. T., Oven Lamp etc.
Replace D.P.C.
L. V. T., Oven Lamp etc.
Replace D.P.C.
2
Low voltage transformer (L.V.T.)
secondary voltage
secondary voltage
Abnormal 0V
L.V.T.
Normal
→ Step 3
3
IC1 pin 7 voltage (Emitter of Q10)
Abnormal
ZD10,Q10
Normal = 5V
→ Step 4
4
IC1 pin 4 voltage (pin 6 of IC380)
Abnormal
IC380
Normal
5V
→ IC1, CX320, DISPLAY
No key input
1
Membrane switch continuity
Abnormal
Membrane switch
Normal
IC1
No beep sound
1
IC1 pin 18 voltage
Abnormal
IC1
Normal
BZ210, Q210, Q211,
Q212, Q213, ZD210
Q212, Q213, ZD210
Power relay A(RY3) does not turn on
even though the program has been set
and the start pad is tapped
even though the program has been set
and the start pad is tapped
1
IC1 pin 61 voltage while operation
Abnormal
IC1
Normal=5V
→ Step 2
2
short circuit between collector and
emitter of Q226
emitter of Q226
Still not turn on
RY3
RY-2 turns on
Q226
No microwave oscillation at any power
setting
setting
1
IC1 pin 1 and pin 64 voltages while
operation at high power
operation at high power
Abnormal
IC1
Normal
1---5V, 64---5V IC1
1---5V, 64---5V IC1
→ Step 2
2
Transistor Q220 and Q350
Abnormal
Q220 and/or Q350
Normal
RY1
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
24
NE-1027 / NE-1037
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