Panasonic NN-ST686S User manual

© 2006 Panasonic Home Appliances Microwave
Oven (Shanghai) Co., Ltd. All rights reserved.
Unauthorized copying and distribution is a violation
of law.
NN-ST686S
NN-ST656W
KTE(UAE)
PTE(Iran)
KPQ(Kuwait, Doha, Qatar, Oman, Bahrain, Pakistan)
STM(Saudi Arabia)
Microwave Oven
Please file and use this manual together with the service manual for Model NN-S560WF (ORDER NO.
SIMMC0006012C3)
ORDER NO.PHAMOS0606035A3

2
NN-ST686S / NN-ST656W

1 SCHEMATIC DIAGRAM (STM) 4
2 SCHEMATIC DIAGRAM (EXCEPT FOR STM) 5
3 CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING
6
3.1. Check the grounding 6
3.2. Inverter warnings 6
3.3. Part replacement. 7
3.4. When the 10A fuse is blown due to the operation of the
short switch: 7
3.5. Avoid inserting nails, wire etc. through any holes in the
unit during operation. 7
3.6. Confirm after repair 7
3.7. Sharp edges 7
4 MEASUREMENTS AND ADJUSTMENTS 8
4.1. Adjustment of primary latch switch, secondary latch switch
and short switch. 8
4.2. Measurement of microwave output 8
5 EXPLODED VIEW AND PARTS LIST 9
5.1. EXPLODED VIEW 9
5.2. PARTS LIST 10
5.3. DOOR ASSEMBLY 11
5.4. WIRING MATERIALS 11
5.5. ESCUTCHEON BASE ASSEMBLY 12
5.6. PACKING AND ACCESSORIES 14
5.7. H.V. INVERTER BOARD MAIN PARTS LIST
(F606Y4V00XN) 14
6 DIGITAL PROGRAMMER CIRCUIT 15
6.1. SCHEMATIC DIAGRAM 15
6.2. PARTS LIST 17
CONTENTS
Page Page
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NN-ST686S / NN-ST656W

1 SCHEMATIC DIAGRAM (STM)
4
NN-ST686S / NN-ST656W

2 SCHEMATIC DIAGRAM (EXCEPT FOR STM)
5
NN-ST686S / NN-ST656W

Unlike many other appliances, the microwave oven is a high
voltage, high current device. It is free from danger in ordinary
use, though extreme care should be taken during repair.
Caution
Servicemen should remove their watches whenever
working close to or replacing the magnetron.
3.1. Check the grounding
Do not operate on a two wire extension cord. The microwave
oven is designed to be grounded when used. It is imperative,
therefore, to ensure the appliance is properly grounded before
beginning repair work.
3.2. Inverter warnings
DANGER, HIGH VOLTAGE AND HIGH TEMPERATURE
(HOT/LINE) OF THE INVERTER POWER SUPPLY (U)
The high voltage inverter power supply handles very high
voltage and current for the magnetron tube. Though it is
free from danger in ordinary use, extreme care should be
taken during repair.
The aluminum heat sink is also energized with high voltage
(HOT), do not touch when the AC input terminals are
energized. The power device Collector is directly connected
to the aluminum heat sink.
The aluminum heat sink may be HOT due to heat energy,
therefore, extreme care should be taken during servicing.
H.V. Inverter warning
WARNING FOR INVERTER POWER SUPPLY (U)
GROUNDING
Check the high voltage inverter power supply circuit
grounding. The high voltage inverter power supply circuit
board must have a proper chassis ground. The inverter
grounding bracket must be connected to the chassis. If the
inverter board is not grounded it will expose the user to very
high voltages and cause extreme DANGER! Be sure that
the inverter circuit is properly grounded via the inverter
earth bracket.
Grounding of the inverter circuit board
WARNING! DISCHARGE THE HIGH VOLATGE
CAPACITORS
For about 30 seconds after the oven is turned off, an
electric charge remains in the high voltage capacitors in the
inverter power supply circuit board.
When replacing or checking parts, remove the power plug
from the outlet and short the inverter output terminal of the
magnetron filament terminals to the chassis ground with an
insulated handle screwdriver to discharge. Please be sure
to touch the chassis ground side first and then short to the
output terminals.
Discharging the high voltage capacitors
WARNING
There is high voltage present with high current capabilities
in the circuits of the primary and secondary windings, choke
coil and heat sink of the inverter. It is extremely dangerous
to work on or near these circuits with the oven energized.
DO NOT measure the voltage in the high voltage circuit
including the filament voltage of the magnetron.
WARNING
Never touch any circuit wiring with your hand or with an
insulated tool during operation.
3 CAUTIONS TO BE OBSERVED WHEN
TROUBLESHOOTING
6
NN-ST686S / NN-ST656W

3.3. Part replacement.
When any part or component is to be replaced, always ensure
that the power cord is removed from the wall outlet.
3.4. When the 10A fuse is blown
due to the operation of the
short switch:
WARNING
When the 10A 250V fuse is blown due to the operation of
the interlock monitor switch, replace all of the components
(primary latch switch, door switch, short switch and power
relay B (RY1)).
1. This is mandatory. Refer to “adjustments and
measurements” for the location of these switches.
2. When replacing the fuse, confirm that it has the
appropriate rating for these models.
3. When replacing faulty switches, be sure the mounting
tabs are not bent, broken or deficient in their ability to
hold the switches.
3.5. Avoid inserting nails, wire etc.
through any holes in the unit
during operation.
Never insert a wire, nail or any other metal object through the
lamp holes on the cavity or any holes or gaps, because such
objects may work as an antenna and cause microwave
leakage.
3.6. Confirm after repair
1. After repair or replacement of parts, make sure that the
screws of the oven, etc. are neither loose nor missing.
Microwaves might leak if screws are not properly tightened.
2. Make sure that all electrical connections are tight before
inserting the plug into the wall outlet.
3. Check for microwave energy leakage. (Refer to procedure
for measuring microwave energy leakage).
CAUTION MICROWAVE RADIATION
USE CAUTION NOT TO BECOME EXPOSED TO
RADIATION FROM THE MICROWAVE MAGNETRON OR
OTHER PARTS CONDUCTING MICROWAVE ENERGY
IMPORTANT NOTICE
The following components have potentials above 2000V
while the appliance is operated.
•Magnetron
•High voltage transformer (Located on inverter (U))
•High voltage diodes (Located on inverter (U))
•High voltage capacitors (Located on inverter (U))
Pay special attention to these areas.
When the appliance is operated with the door hinges or
magnetron installed incorrectly, the microwave leakage can
exceed more than 5mW/cm2. After repair or exchange, it is
very important to check if the magnetron and the door
hinges are correctly installed.
3.7. Sharp edges
Caution
Please use caution when unpacking, installing or moving
the unit, as some exposed edges may be sharp to the touch
and cause injury if not handled with care.
7
NN-ST686S / NN-ST656W

4.1. Adjustment of primary latch
switch, secondary latch switch
and short switch.
1. Mount the Primary latch switch, the secondary latch switch
and the short switch to the door hook assembly as shown in
ILL.
NOTE:
No specific individual adjustments during
installation of the Primary latch switch, Secondary
latch switch or Short switch to the door hook are
required.
2. When mounting the door hook assembly to the oven
assembly, adjust the door hook assembly by moving it in
the direction of the arrows in the illustration, so that the
oven door will not have any play in it. Check for play in the
door by pulling the door assembly. Make sure that the latch
keys move smoothly after adjustment is completed.
Completely tighten the screws holding the door hook
assembly to the oven assembly.
3. Reconnect the short switch and check the continuity of the
monitor circuit and all latch switches again by following the
component test procedures.
4.2. Measurement of microwave
output
The output power of the magnetron can be determined by
performing IEC standard test procedures. However,due to the
complexity of IEC test procedures, it is recommended to test
the magnetron using the simple method outlined below.
Necessary Equipment:
*1 liter beaker *Glass thermometer
*Wrist watch or stopwatch
NOTE:
Check the line voltage under load.Low voltage will
lower the magnetron output. Take the temperature
readings and heating time as accurately as possible.
1. Fill the beaker with exactly one liter of tap water.Stir the
water using the thermometer and record the water’s
temperature. (recorded as T1).
2. Place the beaker on the center of glass tray.
Set the oven for High power and heat it for exactly one
minute.
3. Stir the water again and read the temperature of the water.
(recorded as T2).
4. The normal temperature rise at High power level for each
model, is as shown in table.
TABLE (1L-1min.test)
RATED OUTPUT TEMPERATURE RISE
1100W Min. 9.4°C
4 MEASUREMENTS AND ADJUSTMENTS
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5 EXPLODED VIEW AND PARTS LIST
5.1. EXPLODED VIEW
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NN-ST686S / NN-ST656W

5.2. PARTS LIST
NOTE:
1. When ordering replacement part(s), please use part number(s) shown in this part list.
Do not use description of the part.
2. Important safety notice:
Components identified by mark have special characteristics important for safety.
When replacing any of these components, use only manufacture’s specified parts.
NOTE:
“A” parts are supplied by CSD (Japan)
“F” parts are supplied by PHAMOS (China)
Ref. No. Part No. Part Name & Description Pcs/Set Remarks
1F00066V00HP CAUTION LABEL 1
3F21555500AP OVEN STICKY PAPER 1
4F10014T00APG BASE 1
5F10084T00AP RUBBER FOOT 4
6F110D5Y00SAP CABINET BODY(U) 1ST686S
6F110D5Y30HAP CABINET BODY(U) 1ST656W
7F200A8F00AP OVEN(U) 1ST686S
7F200A8F40AP OVEN(U) 1ST656W
8F20555L00AP COVER 1
9F21315Y00AP PULLY SHAFT 1
10 F2177-F80 WASHER 1
11 F290D9330AP ROLLER RING(U) 1
12 F30206G30AP DOOR HOOK 1
14 F31366G30AP HOOK LEVER A 1
15 F31376G30AP HOOK LEVER B 1
16 F31386G30AP HOOK LEVER C 1
17 F400A6V00QP FAN MOTOR 1EXCEPT STM
17 F400A4T10SN FAN MOTOR 1STM
18 F40084T00AP FAN BLADE 1
19 F40257D00APG AIR GUIDE A 1
20 F41444T00AP ORIFICE 1
21 A707S4T00AP STEAM SENSOR 1ST686S
22 F64508660AP SENSOR COVER B 1ST686S
24 F65434T00AP SENSOR COVER C 1ST686S
25 F612E6W50XP INCANDESCENT LAMP (U) 1
26 F61425U30XN MICRO SWITCH 1(PRIMARY LATCH SWITCH) (V-15G-3C25)
27 J61414T00AP MICRO SWITCH 1(SECONDARY LATCH SWITCH) (D3V-16G-3C25)
28 F61455L00CP THERMAL CUTOUT 1105°C
29 F66264T00CP THERMAL CUTOUT INSULATION BRACKET 1
30 F61785U30XN MICRO SWITCH 1(SHORT SWITCH) (D3V-1G-2C25)
31 F606Y4V00XN H.V.INVERTER (U) 1
32 2M261-M32KLY MAGNETRON 1EXCEPT STM
32 2M261-M32J MAGNETRON 1STM
33 F62306V60BP FUSE 110A/240V,50Hz
34 F40264T60APG AIR GUIDE B 1
35 F61844T00AP GROUNDING PLATE 1
36 F63265U30XN TURNTABLE MOTOR 1
37 F900C8F70YK AC CORD W/PLUG 1KTE,KPQ
37 F900C5E90SN AC CORD W/PLUG 1STM
37 F900C8F60PT AC CORD W/PLUG 1PTE
38 F692Y8A00YN NOISE FILTER (U) 1EXCEPT STM
38 F692Y8A00QP NOISE FILTER (U) 1STM
39 XTWFA4+12T SCREW 4FOR MAGNETRON
40 XTTFA4+6BN SCREW 1FOR COVER
42 XTCAFA4+12AFM SCREW 1FOR CABINET BODY SIDE (ST686S)
42 XTCAFA4+12AFW SCREW 1FOR CABINET BODY SIDE (ST656W)
43 XTWFA4+12D SCREW 4FOR CABINET BODY
45 F02445Y00AP CAUTION LABEL 1ST686S
46 F03348F60KT MENU LABEL 1ST686S
47 F02395E20KN CORD CAUTION LABEL 1
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NN-ST686S / NN-ST656W

5.3. DOOR ASSEMBLY
Ref. No. Part No. Part Name & Description Pcs/Set Remarks
D1 F3018-1200 DOOR KEY A 1
D2 F301A8F70HQP DOOR A (U) 1ST656W
D3 F302K5L00AP DOOR E (U) 1
D4 F30215G10XN DOOR KEY SPRING 1
D5 F30854T00AP DOOR C 1
D6 F31456V60XP DOOR SCREEN A 1
D7 F31468F70BQP DOOR SCREEN B 1ST656W
D9 F301A8F60SPT DOOR A (U) 1ST686S
5.4. WIRING MATERIALS
Ref. No. Part No. Part Name & Description Pcs/Set Remarks
W1 F030A8F60PT LEAD WIRE HARNESS 1EXCEPT STM
W1 F030A8F60ST LEAD WIRE HARNESS 1STM
W2 F030E8F60PT H.V.LEAD WIRE 1EXCEPT STM
W2 F030E8A00QP H.V.LEAD WIRE 1STM
11
NN-ST686S / NN-ST656W

5.5. ESCUTCHEON BASE ASSEMBLY
5.5.1. NN-ST686S
Ref. No. Part No. Part Name & Description Pcs/Set Remarks
E1 F603L8F60KT D.P.CIRCUIT (AU) 1ST686S KTE/PTE
E1 F603L8F60KP D.P.CIRCUIT (AU) 1ST686S KPQ
E1 F603L8F60ST D.P.CIRCUIT (AU) 1ST686S STM
E3 F800L5Y70SAP ESCUTCHEON BASE (U) 1ST686S
E6 F80725Y00SAP DOOR OPENING BUTTON 1ST686S
E7 F82565Y00AP DOOR OPENING LEVER 1ST686S
E8 F80375K00AP COOK BUTTON SPRING 1
E9 F630Y8F60SPT MEMBRANE SWITCH (U) 1ST686S
E14 F90095X00AP GROUNDING PANEL 1ST686S
E15 F00078F60SKT NAME PLATE 1ST686S KTE
E15 F00078F60SPT NAME PLATE 1ST686S PTE
E15 F00078F60SKP NAME PLATE 1ST686S KPQ
E15 F00078F60SST NAME PLATE 1ST686S STM
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5.5.2. NN-ST656W
Ref. No. Part No. Part Name & Description Pcs/Set Remarks
E21 F603L8F90KT D.P.CIRCUIT (AU) 1ST656W KTE/PTE
E21 F603L8F90KP D.P.CIRCUIT (AU) 1ST656W KPQ
E21 F603L8F90ST D.P.CIRCUIT (AU) 1ST656W STM
E23 F630Y8F90BPT MEMBRANE SWITCH (U) 1ST656W
E24 F80348F70HQP ESCUTCHEON BASE 1ST656W
E25 F80728F70HQP DOOR OPENING BUTTON 1ST656W
E26 F80375K00AP COOK BUTTON SPRING 1
E27 F82566K10AP DOOR OPENING LEVEL 1ST656W
E28 F00078F90HKT NAME PLATE 1ST656W KTE
E28 F00078F90HPT NAME PLATE 1ST656W PTE
E28 F00078F90HKP NAME PLATE 1ST656W KPQ
E28 F00078F90HST NAME PLATE 1ST656W STM
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NN-ST686S / NN-ST656W

5.6. PACKING AND ACCESSORIES
Ref. No. Part No. Part Name & Description Pcs/Set Remarks
P1 F00038F60KP INSTRUCTION MANUAL 1ST686S
P1 F00038F90KP INSTRUCTION MANUAL 1ST656W
P2 F01028F60SKT PACKING CASE, PAPER 1ST686S KTE/PTE
P2 F01028F60SKP PACKING CASE, PAPER 1ST686S KPQ/STM
P2 F01028F90HKT PACKING CASE, PAPER 1ST656W KTE/PTE
P2 F01028F90HKP PACKING CASE, PAPER 1ST656W KPQ/STM
P3 F01046K50AP UPPER FILLER 1
P4 F01055L00AP LOWER FILLER 1
P5 F01068100XN P.E.BAG 1
P6 F01078100XN DOOR SHEET 1
P8 F06014T00AP COOKING TRAY 1
P10 F000B7J70KP COOKING GUIDE 1
P11 F04458F60SKT OVERLAY 1ST686S
P11 F04458F90HKT OVERLAY 1ST656W
5.7. H.V. INVERTER BOARD MAIN PARTS LIST (F606Y4V00XN)
Ref. No. Part No. Part Name & Description Pcs/Set Remarks
Q701
A691E4V10GP
TRANSISTOR SI 1
Q702 TRANSISTOR SI 1
DB701 AESTRS2006M DIODE SI 120A,600V
D701,D702 A62024V00GP DIODE SI 20.3A
C704,C705 ECWH30822JUA CAPACITOR 28200PF 3000VDC
T701 F609A4V00XN H.V. TRANSFORMER 1
F607D4V00XN D.P.CIRCUIT (KU) 1
L701 F50204V00XN CHOKE COIL 1
CT701 F66904V00XN CURRENT TRANSFORMER 1
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NN-ST686S / NN-ST656W

6 DIGITAL PROGRAMMER CIRCUIT
6.1. SCHEMATIC DIAGRAM
15
NN-ST686S / NN-ST656W

16
NN-ST686S / NN-ST656W

6.2. PARTS LIST
Ref. No. Part No. Part Name & Description Pcs/Set Remarks
BZ210 L0DDEA000014 BUZZER 12.0KHz
C222 F1H1H103A220 CHIP CAPACITOR 10.01µF/50V
C486 F1H1H103A220 CHIP CAPACITOR 10.01µF/50V (ST686S)
C481 F1H1H473A220 CHIP CAPACITOR 10.047µF/50V (ST686S)
C11,C223,C350 F1H1E104A030 CHIP CAPACITOR 30.1µF/25V
C220,C221 F1H1A105A019 CHIP CAPACITOR 21µF/10V
C330 F1H1H102A219 CHIP CAPACITOR 11000PF/50V
C352 F1H1H1010005 CHIP CAPACITOR 1100PF/50V
C12 AECETK1V561B AL CHEM CAPACITOR 1560µF/35V
C13,C16 AECETS1C220B AL CHEM CAPACITOR 222µF/16V
C482 AECETS1H010B AL CHEM CAPACITOR 11µF/50V (ST686S)
C483 AECETS1HR47B AL CHEM CAPACITOR 10.47µF/50V (ST686S)
C485 AECETS1H2R2B AL CHEM CAPACITOR 12.2µF/50V (ST686S)
CN1 K1KA03AA0115 CONNECTOR 1
CN2 K1KA03A00299 CONNECTOR 13 Pin (ST686S)
CN3 F03524U00AP INV. HARNESS (U) 1
CN4 F03535G40XN CONNECTOR 1
CN8 K1MN09AA0040 CONNECTOR 19Pin
CX320 EF0EC8004A4 CERAMIC RESONATOR 18.00MHz
DISP110 L5AAAEC00057 LCD 1
DISP1 HOLDER F66174U20AP LCD HOLDER 1
D10-D13 B0EAKT000025 DIODE 4
D220-D222,D224,D227 MA2C19600E DIODE 5
D480 MA2C700A0F DIODE 1(ST686S)
D25 D4EAY511A036 VARISTOR 1510V
D26,D27 D4EAY112A036 VARISTOR 21100V
D180-D183 B3ACB0000065 CHIP-LED 4
IC1 MN101C78ADL L.S.I. 1
IC350 C0EBE0000401 IC 1
IC480 C0ABBA000230 IC 1(ST686S)
Q222,Q330 UNR211100L CHIP DIGI-TRANSISTOR 2
Q182,Q210,Q331 UNR221M00L CHIP DIGI-TRANSISTOR 3
Q10,Q180 B1BAAJ000003 TRANSISTOR 2
Q11,Q181,Q224,Q231 2SD0601A0L CHIP TRANSISTOR 4
Q220 2SB709A0L CHIP TRANSISTOR 1
R320 D0GBR00JA071 CHIP RESISTOR 1 0Ω,1/10W,5%
R13,R221,R223,R229,R231,R353 D0GB104JA068 CHIP RESISTOR 6100K,1/10W,5%
R483,R484,R489 D0GB105JA071 CHIP RESISTOR 31MΩ,1/10W,5% (ST686S)
R182 D0GB360JA072 CHIP RESISTOR 136Ω,1/10W,5%
R11 D0GB681JA069 CHIP RESISTOR 1680Ω,1/10W,5%
R224,R350,R441 D0GB102JA071 CHIP RESISTOR 31K,1/10W,5%
R230 D0GB152JA072 CHIP RESISTOR 11.5K,1/10W,5%
R220 D0GB222JA072 CHIP RESISTOR 12.2K,1/10W,5%
R210 D0GB332JA072 CHIP RESISTOR 13.3K,1/10W,5%
R340,R341 D0GB103JA072 CHIP RESISTOR 210K,1/10W,5%
R490,R492 D0GB103JA072 CHIP RESISTOR 210K,1/10W,5% (ST686S)
R485 D0GB154JA068 CHIP RESISTOR 1150K,1/10W,5% (ST686S)
R488,R491 D0GB202JA071 CHIP RESISTOR 22KΩ,1/10W,5% (ST686S)
R180,R330 D0GB333JA070 CHIP RESISTOR 233K,1/10W,5%
R222 D0GB363JA072 CHIP RESISTOR 136K,1/10W,5%
R236,R331 D0GB471JA069 CHIP RESISTOR 2470Ω,1/10W,5%
R495 D0GB471JA069 CHIP RESISTOR 1470Ω,1/10W,5% (ST686S)
R10,R14,R15,R351 D0GB472JA072 CHIP RESISTOR 44.7K,1/10W,5%
R480,R481 D0GB472JA072 CHIP RESISTOR 24.7K,1/10W,5% (ST686S)
R487 D0GB433JA072 CHIP RESISTOR 143KΩ,1/10W,5% (ST686S)
R440,C440 D0GB512JA072 CHIP RESISTOR 25.1K,1/10W,5%
R486 D0GB684JA068 CHIP RESISTOR 1680KΩ,1/10W,5% (ST686S)
R225 D0AE470JA155 CHIP RESISTOR 147Ω,1/4W,5%
R211 D0AE102JA155 CARBON RESISTOR 11K,1/4W,5%
R228,R352 D0AE104JA155 CARBON RESISTOR 2100K,1/4W,5%
RY1 AEBGJQC25F18 POWER RELAY 1
T10 G4C3AAH00008 LOW VOLTAGE TRANSFORMER 1
ZD10 B0BA5R600016 ZENER DIODE 1
ZD11 B0BA4R400002 ZENER DIODE 1
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NN-ST686S / NN-ST656W
07/06
S-8F6
S-8F9
Printed in China