Panasonic NN-SD382SZPE / NN-SD372SZPE Service Manual ▷ View 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
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
IC10 pin5 voltage
Abnormal
IC10, ZD10
Normal=5V
IC1, CX320, Display
No key input
1
Touch switch continuity
Abnormal
Touch switch
Normal
IC1
No beep sound
1
IC1 pin 62 voltage
Abnormal
IC1
Normal=5V
BZ210, Q210
No microwave oscillation at any power
1
IC1 pin 27 voltages while operation at high
power
power
Abnormal
IC1
Normal=5V
→Step2
2
Collector of Q220 voltage
Abnormal
Q220 and /or Q221, Q222,
Q225, Q227
Q225, Q227
Normal 0.7V
→Step3
3
Short circuit between collector and emitter
of Q220
of Q220
Still not turn on
RY1
RY1 turns on
Q220 and /or Q221, Q222,
Q225, Q227
Q225, Q227
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 pin3 voltage
measure pin3 voltage
Abnormal=0V
D.P.C.
Approx. AC 3V
Magnetron
21
NN-SD382S / NN-SD372S
9.4. Simple way of H.V. Inverter/magnetron troubleshooting
Purpose:
Simple way (3/23 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.
procedure.
Power will:
Ammeter reading is:
To do:
Remedy:
Shut off in 23 seconds
after “Start”.
after “Start”.
1. Between 0.5A and 1.0A.
Check and repair open magnetron circuit 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
(F606YBA00GP)
(F606YBA00GP)
2. D702 is OK
Replace magnetron
Shut off in 3 seconds
after “Start”
after “Start”
1. Less than 0.5A
Check open circuit: Latch Switch, DPC,
Power Relay and CN701
Power Relay and CN701
Replace
defective
component(s),
or
correct switch, cables and connectors.
9.5. How to check the semiconductors using an OHM meter
22
NN-SD382S / NN-SD372S
9.6. H.V. INVERTER MAIN PARTS LIST (F606YBA00GP)
Ref. No.
Part No.
Part Name & Description
Pcs/Set
Remarks
Q701
Z1JAEV000003
IGBT
1
C701
ZCWHC3B104JA
FILM CAPACITOR
1
0.1µF,1000VDC
C702
ZCWF4305N851
FILM CAPACITOR
1
3µF,250VDC
DB701
Z0FBBQ000006
RECTIFIER BRIDGE
1
L701
Z5020W100AP
CHOKE COIL
1
R702
Z0CM562JA002
SAND BAR RESISTOR
1
T701
Z609ABA00GP
TRANSFORMER
1
(INCLUDING D701,D702,C706,C707)
D701,D702
Z0FBAZ000003
DIODE
2
C706
Z0C3F562A002
FILM CAPACITOR
1
5600PF/3KV
C707
Z0C3F822A002
FILM CAPACITOR
1
8200PF/3KV
23
NN-SD382S / NN-SD372S
10 EXPLODED VIEW AND PARTS LIST
10.1. EXPLODED VIEW
24
NN-SD382S / NN-SD372S
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