Panasonic NN-ST686S Manual de usuario

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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

NN-ST686S / NN-ST656W

1 SCHEMATIC DIAGRAM (STM) 4

2 SCHEMATIC DIAGRAM (EXCEPT FOR STM) 5

3 CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING

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

NN-ST686S / NN-ST656W

1 SCHEMATIC DIAGRAM (STM)

NN-ST686S / NN-ST656W

2 SCHEMATIC DIAGRAM (EXCEPT FOR STM)

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

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.

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

NN-ST686S / NN-ST656W

5 EXPLODED VIEW AND PARTS LIST

5.1. EXPLODED VIEW

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

NN-ST686S / NN-ST656W

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