Panasonic NN-CS597S APH, Руководство по обслуживанию

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10.4. 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 IC10 pin5 voltage Abnormal IC10
Normal=5V IC1, CX320, Display
No key input 1 Membrane switch continuity Abnormal Membrane switch
Normal IC1
No beep sound 1 IC1 pin 8 voltage Abnormal IC1
Normal=5V BZ210, Q210
Power relay RY2 does not turn on
even though the program had been set
and the start button is tapped 1 IC1 pin 22 voltage while operation Abnormal IC1
Normal=5V
→
Step2
2 Collector of Q222 voltage Abnormal Q222
Normal 0.7V RY2
No microwave oscillation at any power 1 IC1 pin 24 voltages while operation at high
power Abnormal IC1
Normal=5V
→
Step2
2 Collector of Q223 voltage Abnormal Q223
Normal 0.7V
→
Step3
3 Short circuit between collector and emitter
of Q223 Still not turn on RY1, Q227
RY1 turns on Q223
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
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 1 Unplug CN702 (2 pin) connector and
measure voltage between terminals Abnormal=0V 1. Latch Switch
2. D.P.C. /Power Relay
Normal=120V
→
Step2
2 Unplug CN701 (3 pin) connector and
measure pin3 voltage Abnormal=0V D.P.C.
Approx. AC 3V Magnetron
10.5. SIMPLE WAY OF H.V. INVERTER/MAGNETRON TROUBLESHOOTING
Purpose:
Simple way (3/37 seconds rule) of identifying whether it’s Magnetron, Inverter or others.
Set-up:
The unit under question is connected through the Ammeter as shown below.
Procedure:
Follow the matrix table below to identify the problem source.
Note:
Do not replace both Inverter board and Magnetron simultaneously and automatically without going through this
procedure.
Power will: Ammeter reading is: To do: Remedy:
Shut off in 37 seconds
after “Start”. 1. Between 0.5A and 1.0A. Check and repair open magnetron circuit
CN703. Open magnetron wiring between Inverter
and magnetron terminal.
2. Between 1.0A and 2.0A. Check continuity of D702 in Inverter PCB.
1. D702 shorted Replace H.V.Inverter (F606Y8M00AP)
2. D702 is OK Replace magnetron
Shut off in 3 seconds
after “Start”. 1. Less than 0.5A Check open circuit: Latch Switch, DPC,
Power Relay, CN701 and CN702. Replace defective component(s), or
correct switch, cables and connectors.
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NN-CS597S