Read Panasonic NN-CD565BZPE Service Manual online
7.3. 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
2
Low voltage transforment (L.V.T.)
secondary voltage
secondary voltage
Abnormal 0V
L.V.T.
Normal
→Step3
3
IC10 pin 5 voltage
Abnormal
IC10, ZD10
Normal=5V
IC1, Display
No key input
1
Membrane switch continuity
Abnormal
Membrane switch
Normal
IC1
No beep sound
1
IC1 pin 5 voltage
Abnormal
IC1
Normal=5V
BZ210, Q224
Power relay RL2 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 29 voltage while operation
Abnormal
IC1
Normal=5V
→Step2
2
Collector of Q223 voltage
Abnormal
Q223
Normal 0.7V
RL2
No microwave oscillation at any
power
power
1
IC1 pin 21 voltages while operation at high
power
power
Abnormal
IC1
Normal=5V
→Step2
2
Collector of Q222 voltage
Abnormal
Q222 and/or Q221, Q225, Q226
Normal 0.7V
→Step3
3
Short circuit between collector of Q222
and emitter of Q226
and emitter of Q226
Still not turn on
RY1
RL1 turns on
Q222 and/or Q221, Q225, Q226
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
H95/H97/H98 appears in window and
oven stops operation.Program High
power for 1 minute and conduct
following test quickly, unless
H95/H97/H98 appears and oven
stops
oven stops operation.Program High
power for 1 minute and conduct
following test quickly, unless
H95/H97/H98 appears and oven
stops
1
Unplug CN702 (2 pin) connector and
measure voltage between terminals
measure voltage between terminals
Abnormal=0V
1. Latch Switch
2. D.P.C. /Power Relay
2. D.P.C. /Power Relay
Normal=220V
→Step2
2
Unplug CN701 (3 pin) connector and
measure pin1 voltage of D. P. C. CN3
measure pin1 voltage of D. P. C. CN3
Abnormal=0V
D.P.C.
Approx. AC 3V
Magnetron
21
NN-CD565B
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