Sharp R-204, R-204W Service Manual

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R-204(W)

TABLE OF CONTENTS

Page

CAUTION, MICROWAVE RADIATION.................................................................................................... 1

WARNING.................................................................................................................................................1

SERVICING ............................................................................................................................................. 2

PRODUCT SPECIFICATIONS .................................................................................................................5

GENERAL INFORMATION.......................................................................................................................5

APPEARANCE VIEW .............................................................................................................................. 6

OPERATION SEQUENCE........................................................................................................................7

FUNCTION OF IMPORTANT COMPONENTS ....................................................................................... 8

TROUBLESHOOTING GUIDE .................................................................................................................9

TEST PROCEDURE.............................................................................................................................. 10

CONTROL PANEL ASSEMBLY ............................................................................................................15

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE.................................................. 18

MICROWAVE MEASUREMENT ........................................................................................................... 24

TEST DATA AT A GLANCE .................................................................................................................. 25

WIRING DIAGRAM................................................................................................................................ 25

PICTORIAL DIAGRAM .......................................................................................................................... 26

CONTROL PANEL CIRCUIT ..................................................................................................................27

PRINTED WIRING BOARD ....................................................................................................................28

PARTS LIST .......................................................................................................................................... 29

S8102R204PHW/

MICROWAVE OVEN

MODEL R-204(W)

In interests of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used.

SERVICE MANUAL

SHARP CORPORATION

400

560

800

240

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R-204(W)

CAUTION

MICROWAVE RADIATION

Personnel should not be exposed to the microwave energy which may radiate from the magnetron or other microwave generating devices if it is improperly used or connected. All input and output microwave connections, waveguides, flanges and gaskets must be secured. Never operate the device without a microwave energy absorbing load attached. Never look into an open waveguide or antenna while the device is energized.

VARNING

MICKROVAGSSTRALING

Personal får inte utsättas för mikrovågsenergi som kan ustrala från magnetronen eller andre mikrovågsalstrande anordningar om dessa är felanslutna eller används på fel sätt. Alla in-och utgångsanslutningar för mikrovågor, vagledare, flänsar och packningar måste vara fast anslutna. Mikrovågsgeneratorn får inte arbeta utan att absorberande belastning är ansluten. Titta aldrig in i ën öppen vågledare eller antenn när mikrovågsgeneratorn är påkopplad eller laddad.

VAROITUS

MIKROAALTOSÄTELYÄ

Käyttäjä ei saa joutua alttiiksi mikroaaltoenergialle, jota voi säteillä magnetronista tai muusta mikroaaltoja kehittävästä laitteesta, jos sitä käytetään tai jos se kytketään väärin. Kaikkien mikroaaltoliitäntöjen sekä syöttö-että ulostulopuolella, aaltoputkien laippojen ja tiivisteiden tulee olla varmistettuja. Mikroaaltouunnia ei koskaan saa käyttää ilman kuormaa jossa mikroaaltoenergiaa kuluu. Avoimeen aaltoputkeen tai antenniin ei koskaan saa katsoa virran ollessa kytkettynä.

ADVARSEL

MIKROBØLGESTRÅLING

Personell må ikke utsettes for mikrobølge-energi som kan utståles fra magnetronen eller andre mikrobølge-generende deler dersom apparatet feilbetjenes eller blir feiltikoplet. Alle inn-og ut-tilkoplinger i forbindelse med mikrobølge-strålingen, bølgeledere, flenser og tetningsringer/pakninger må festes ordentlig. Aldri bruk apparatet med mindre en mikrobålge-absorberende last er plassert i ovnsrommet. Aldri se direkte inn i en åpen bølgeleder eller antenne imens apparatet er strømførende.

ADVARSEL

MIKROBØLGEBESTRÄLING

Man bør ikke udsætte sig for mikrobølgebestråling fra magnetronen eller andre mikrobølgefrembringende anordninger, hvilket kan ske hvis apparatet er forkert tilsluttet eller bruges forkert. Alle mikrobølgeindgange og-udgange, bølgeledere, flanger og tætningsstrimler må være forsvarligt udført. Anvend aldrig ovnen uden en mikrobølgesabsorberende anordning. Se aldrig ind i en åben bølgeleder eller antenne, mens ovnen er i brug.

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R-204(W)

WARNING

Never operate the oven until the following points are ensured. (A) The door is tightly closed. (B) The door brackets and hinges are not defective. (C) The door packing is not damaged. (D) The door is not deformed or warped. (E) There is not any other visible damage with the oven.

Servicing and repair work must be carried out only by trained service engineers.

Removal of the outer wrap gives access to potential above 250V.

All the parts marked "∆" on the parts list may cause undue microwave exposure, by themselves, or when they are damaged, loosened or removed.

SHARP CORPORATION

OSAKA, JAPAN

SERVICE MANUAL

MICROWAVE OVEN

R-204(W)

GENERAL IMPORTANT INFORMATION

This Manual has been prepared to provide Sharp Corp. Service engineers with Operation and Service Information.

It is recommended that service engineers carefully study the entire text of this manual, so they will be qualified to render satisfactory customer service.

WARNING

Note: The parts marked "*" are used at voltage more

than 250V. (Parts List)

Anm: Delar märket med "*" har en spänning

överstigande 250V.

Huom: Huolto-ohjeeseen merkitty "tähdella" osat

joissa jännite on yli 250 V.

Bemerk: Deler som er merket "asterisk" er utsatt for

spenninger over 250V til jord.

Bemærk: "Dele mærket med stjerne benyttes med

højere spænding end 250 volt.

SERVICING

PRODUCT SPECIFICATIONS

GENERAL INFORMATION

APPEARANCE VIEW

OPERATING SEQUENCE

FUNCTION OF IMPORTANT COMPONENTS

TROUBLESHOOTING GUIDE AND TEST PROCEDURE

TOUCH CONTROL PANEL

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

MICROWAVE MEASUREMENT

TEST DATA AT A GLANCE

WIRING DIAGRAM

PARTS LIST

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R-204(W)

REMEMBER TO CHECK 3D

1) Disconnect the supply.

2) Door opened, and wedged open.

3) Discharge high voltage capacitor.

WARNING: AGAINST THE CHARGE OF THE HIGH-

VOLTAGE CAPACITOR

The high-voltage capacitor remains charged about 60 seconds after the oven has been switched off. Wait for 60 seconds and then short-circuit the connection of the highvoltage capacitor (that is, of the connecting lead of the highvoltage rectifier) against the chassis with the use of an insulated screwdriver.

Sharp recommend that wherever possible fault-finding is carried out with the supply disconnected. It may in, some cases, be necessary to connect the supply after the outer case has been removed, in this event carry out 3D checks and then disconnect the leads to the primary of the power transformer. Ensure that these leads remain isolated from other components and the oven chassis. (Use insulation tape if necessary.) When the testing is completed carry out 3D checks and reconnect the leads to the primary of the power transformer.

SERVICING

WARNING TO SERVICE PERSONNEL

GB Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts will

result in electrocution. High voltage capacitor, Power transformer, Magnetron, High voltage rectifier assembly, High voltage harness.

REMEMBER TO CHECK 4R

1) Reconnect all leads removed from components during testing.

2) Replace the outer case (cabinet).

3) Reconnect the supply.

4) Run the oven. Check all functions.

Microwave ovens should not be run empty. To test for the presence of microwave energy within a cavity, place a cup of cold water on the oven turntable, close the door and set the power to HIGH and set the microwave timer for two (2) minutes. When the two minutes has elapsed (timer at zero) carefully check that the water is now hot. If the water remains cold carry out 3D checks and re-examine the connections to the component being tested.

When all service work is completed, and the oven is fully assembled, the microwave power output should be checked and a microwave leakage test should be carried out.

NL Magnetronovens bevatten circuits die een zeer hoge spanning en stroom kunnen voortbrengen. Contact met de

volgende onderdelen kan elektrocutie tot gevolg hebben. Hoogspanningscondensator, hoogspanningstransformator, magnetron, hoogspanningsgelijkrichter, hoogspannings kabelboom.

VERGEET DE VOLGENDE 3 STAPPEN NIET

1) Haal de stekker uit het stopcontact.

2) Open de deur en zorg ervoor dat hij niet dicht kan vallen.

3) Ontlaad de hoogspanningscondensator.

PAS OP VOOR DE ELECTRISCHE LADING VAN DE HOOGSPANNINGSCONDENSATOR

De hoogspanningscondensator blijft nog ongeveer 60 seconden lang opgeladen, nadat de oven is uitgeschakeld. Wacht 60 seconden voordat u de verbinding van de hoogspannings-condensator (m.a.w. de verbindingsdraad van de hoogspanningsgelijkrichter) met een geïsoleerde schroevedraaier kortsluit tegen het chassis.

Sharp beveelt ten sterkste aan dat, voor zover mogelijk, defecten worden opgespoord wanneer de stekker uit het stopcontact is gehaald. Soms is het nodig om de stroomtoevoer weer tot stand te brengen nadat de buitenmantel verwijderd is. Herhaal dan de bovengenoemde 3 stappen en haal de electrische draden uit de primaire zijde van de vermogenstransformator. Zorg ervoor dat deze draden geïsoleerd blijven van andere elementen en van het chassis van de oven. (Gebruik zo nodig isolatieband.) Wanneer de test is uitgevoerd, herhaalt u de bovenstaande 3 stappen en verbindt u de electrische draden weer aan de primaire zijde van de vermogenstransformator.

VERGEET DE VOLGENDE 4 STAPPEN NIET

1) Sluit de draden weer aan diezijn losgehaald voor de test.

2) Plaats de buitenmantel weer om het toestel heen (kabinet).

3) Stop de stekker weer in het stopcontact.

4) Zet de oven aan. Controleer alle functies.

Magnetronovens mogen niet leeg aangezet worden. Om te controleren of er microgolf-energie binnen de oven wordt geproduceerd, plaatst u een mok met koud water op de draaitafel van de oven, sluit de deur, zet de oven op HIGH en stelt de klok van de magnetron in op twee (2) minuten. Wanneer de twee minuten voorbij zijn (klok staat op nul), controleert u voorzichtig of het water heet is. Indien het water nog steeds koud is, herhaalt u de allereerste drie stappen en controleer nogmaals de aansluitingen naar de geteste onderdelen.

Wanneer alle reparaties zijn uitgevoerd en de oven weer in elkaar is gezet, moet de het magnetronvermogen worden gecontroleerd en moet worden gecontroleerd of er geen microgolflekkage is.

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R-204(W)

E Los hornos de microondas contienen circuitos eléctricos capaces de producir voltajes de alta tensión y descargas

eléctricas. Para evitar el riesgo de electrocución, absténgase de tocar los siguientes componentes: condensador de alta tensión, transformador de alta tensión, magnetrón, dispositivo del rectificador de alta tensión y arnés de alta tensión.

RECUERDE LA COMPROBACION 3D

1) Desconecte la alimentación.

2) Deje la puerta abierta y calzada.

3) Descargue el condensador de alto voltaje.

ADVERTENCIA SOBRE LA CARGA DEL CONDENSADOR DE AL T O VOL T AJE

El condensador de alto voltaje permanece cargado unos 60 segundos después de haber apagado el horno. Espere 60 segundos y luego ponga en cortocircuito la conexión del condensador de alto voltaje (esto es, del conductor de conexión del rectificador de alto voltaje) al chasis con un destornillador de mango aislado.

Se recomienda encarecidamente que siempre que sea posible la localización de fallos se realice con la alimentación desconectada. Puede ser que en algunos casos sea necesario conectar la alimentación después de haber retirado la carcasa exterior. En este caso, realice las comprobaciones 3D y luego desconecte los conductores del primario del transformador de alimentación. Asegúrese de que estos conductores permanezcan aislados de otros componentes y del chasis del horno. (Use cinta aislante si es necesario). Cuando termine la prueba efectúe las comprobaciones 3D y reconecte los conductores al primario del transformador de alimentación.

RECUERDE LA COMPROBACION 4C

1) Conecte todos los componentes desconectados de los componentes durante la prueba.

2) Coloque la carcasa exterior (cabina).

3) Conecte la alimentación.

4) Compruebe todas sus funciones despues de poner en marcha el horno.

Los hornos de microondas no deben funcionar vacíos. Para comprobar la presencia de energía de microondas dentro de una cavidad, coloque una taza de agua fría en el plato giratorio del horno, cierre la puerta y ponga la potencia en HIGH (alta) y coloque el temporizador en dos (2) minutos. Cuando transcurran los dos minutos (temporizador a cero) compruebe cuidadosamente que el agua se ha calentado. Si el agua permaneciese fría, efectúe las comprobaciones 3D y vuelva a examinar las conexiones de los componentes que han sido probados.

Cuando haya terminado la intervención en el equipo y el horno haya sido ensamblado de nuevo completamente, deberá comprobar la potencia de salida de microondas y realizar una prueba de fugas de microondas.

SV Mikrovågsugnar innehåller kretsar som producerar mycket höga spänningar och strömmar.

Kontakt med följande komponenter kan leda till dödsfall: Högspänningskondensator, transformator, magnetron, högspännings likriktare, högspännings kablage.

KOM IHÅG ATT KONTROLLERA 3 STEG

1) Koppla från strömkällan.

2) Öppna dörren på glänt.

3) Ladda ur högspänningskondensatorn.

VARNING FÖR LADDNINGEN I HÖGSPÄNNINGSKONDENSATORN

Högspänningskondensatorn är laddad i 60 sekunder efter det att ugnen stängts av. Vänta 60 sekunder och korislut sedan kondensatoms anslutning (dvs anslutningen till högspänningslikriktaren) till chassiet med hjälp av en isolerad skruvmejsel.

Sharp rekommenderar att felsökning sker med strömmen fränkopplad. Ibland kan det var nödvändigt att koppla på strömmen efter det att höljet avlägsnats, utför da 3 Steg kontrollen och koppla sedan från ledarna till transformatorns primärsida. Se till att ledarna är isolerade från andra komponenter och chassiet. (Använd isoleringsband om det behövs). När Du testat färdigt utför Du 3 Steg kontrollen och ansluter ledningarna till transformatorns primärsida igen.

KOM IHÅG ATT KONTROLLERA 4 STEG

1) Anslut alla ledningar som använts vid testning

2) Sätt tillbaka ytterhöljet.

3) Anslut strömkällan på nytt.

4) Sätt på ugnen. Kontrollera alla funktioner.

Mikrovågsugnar får inte användas tomma. Kontrollera mikrovågsstrålningen i olika delar av ugnen genom att placera en kopp med kallt vatten på ugnens tallrik, stäng dörren, ställ in HIGH och ställ in 2 minuter på timern. När två minuter har gått (timem visar 0) kontrollerar du om vattnet är varmt. Om vattnet fortfarande är kallt utför Du 3 steg kontroller och kontrollerar anslutningarna till varje enskild komponent på nytt.

När all service är klar och ugnen ihopskruvad skall ugnens uteffekt och eventuellt mikrovågsläckage kontrolleras.

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R-204(W)

I I forni a microonde contengono un circuito elettrico in grado di generare tensioni e correnti estremamente elevate.

L’eventuale contatto con i seguenti componenti può causare la folgorazione: condensatore ad alta tensione; trasformatore ad alta tensione; magnetron; rettificatore alta tensione; cablaggio ad alta tensione.

TRE OPERAZIONI IMPORT ANTI PER INCOMINCIARE

1) Scollegare l'alimentazione elettrica.

2) Verificare che la porta sia bloccata in posizione aperta.

3) Scaricare il condensatore ad alta tensione.

ATTENZIONE AL CONDENSATORE AD ALTA TENSIONE: PUO ESSERE CARICO

Il condensatore ad alta tensione rimane carico per circa 60 secondi dopo lo spegnimento del forno. Occorre quindi spettare 60 secondi prima di cortocircuitare, utilizzando un cacciavite con impugnatura isolata, il collegamento del condensatore ad alta tensione (cioè del conduttore di collegamento del raddrizzatore ad alta tensione) sul telaio del forno.

Sharp raccomanda, nei limiti del possibile, che la ricerca dei guasti avvenga in assenza di alimentazione elettrica. In alcuni casi tuttavia, può essere necessario alimentare l'apparecchio dopo aver rimosso la scatola esterna. In questo caso eseguire i tre controlli sopra citati e quindi scollegare i connettori dal primario del trasformatore. Assicurarsi che tali connettori non vengano a contatto con altri componenti, ne con il telaio del forno (fare uso, se necessario, di nastro isolante). Al termine dell'intervento, eseguire nuovamente i tre controlli e ricollegare i conduttori al primario del trasformatore.

QUATTRO VERIFICHE IMPORTANTI DA NON DIMENTICARE

1) Ricollegare tutti i conduttori staccati dai vari componenti durante l'intervento.

2) Rimontare la scatola esterna.

3) Ripristinare l'alimentazione elettrica.

4) Rimettere in funzione il forno. Controllare tutte le funzioni.

I forni a microonde non devono mai funzionare a vuoto. Per verificare la presenza di energia da microonde all'interno di una cavitá, mettere una tazza di acqua fredda sul piatto rotante del forno, chiudere la porta, regolare la potenza su HIGH ed impostate il temporizzatore su due (2) minuti. Trascorsi i due minuti (temporizzatore a zero), controllare accuratamente che ora l'acqua sia calda. Se l'acqua è rimasta fredda, eseguire i tre controlli iniziali e verificare nuovamente i collegamenti del componente in questione.

Dopo aver portato a termine le operazioni di manutenzione e rimontato il forno, è necessario controllare la potenza delle microonde emesse ed eseguire un test per verificare che non vi sia alcuna dispersione.

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R-204(W)

PRODUCT DESCRIPTION

SPECIFICATION

ITEM DESCRIPTION

Power Requirements 230 Volts

50 Hertz Single phase, 3 wire earthed

Power Consumption 1.18 kW Power Output

800 W nominal of RF microwave energy (measured by method of IEC 60705) Operating fequency 2450 MHz

Case Dimensions Width 460 mm

Height 275 mm including foot Depth 353 mm

Cooking Cavity Dimensions Width 322 mm

Height 187 mm

Depth 336 mm Turntable diameter 272 mm Control Complement Timer (0 - 30 minutes)

Microwave Power for Variable Cooking

Repetition Rate;

800W .....................................Full power throughout the cooking time

560W ....................................................... approx. 70% of Full Power

400W ....................................................... approx. 50% of Full Power

240W ....................................................... approx. 30% of Full Power

80W ......................................................... approx. 10% of Full Power

Set Weight Approx. 12 kg

GENERAL INFORMATION

WARNING

THIS APPLIANCE MUST BE EARTHED

IMPORTANT

THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE:

GREEN-AND-YELLOW : EARTH BLUE : NEUTRAL BROWN : LIVE

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R-204(W)

APPEARANCE VIEW

OVEN

1. Control panel

2. Door opening button

3. Waveguide cover

4. Seal packing

5. Oven cavity

6. Door

7. Door safety latch

CONTROL PANEL

476 5

8. Door hinges

9. Door seals and sealing surfaces

10.Safety door latches

11.Ventilation openings

12.Outer case

13.Power cord

Timer (0 - 30 Min.)

Light display.

Microwave power control.

Door opening button.

Menu guide. These are the cooking guides for 1 serve. Use 800W power level

Turntable

Roller stay

Seal packing

1. Place the roller stay on the floor of the oven cavity, engaging shaft into turntable motor shaft.

2. Then place the turntable on the roller stay.

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R-204(W)

OPERATION SEQUENCE

OFF CONDITION

Closing the door activates all door interlock switches (1st. interlock switch and 2nd. interlock relay control switch).

IMPORTANT When the timer knob is at "0" the oven in the OFF condition. When the oven door is closed, the monitor switch contacts (COM-NC) must be open. When the microwave oven is plugged in a wall outlet (230V 50Hz), the noise filter and the control panel are energized.

Figure O-1 on page 25

MICROWAVE COOKING CONDITION

HIGH COOKING

When the door is closed, the contacts (COM-NO) of the 1st. interlock switch (SW1) and the monitor switch (SW2) are closed. When the microwave power is set to 800W position by pressing the microwave power level button and cooking time is selected by turning the timer knob, the following components are energized: H.V. transformer, Magnetron, Oven lamp, Turntable motor and Fan motor.

Function sequence

Figure O-2 on page 25

CONNECTED COMPONENTS RELAY Oven lamp, Fan motor, Turntable motor RY1 High voltage transformer RY2

1. The line voltage is supplied to the primary winding of the high voltage transformer. The voltage is converted to about 3.3 volts A.C. output on the filament winding and high voltage of approximately 2000 volts A.C. on the secondary winding.

2. The filament winding voltage (3.3 volts) heats the magnetron filament and the high voltage (2000 volts) is sent to the voltage doubling circuit, where it is doubled to negative voltage of approximately 4000 volts D.C..

3. The 2450 MHz microwave energy produced in the magnetron generates a wave length of 12.24 cm. This energy is channelled through the waveguide (transport channel) into the oven cavity, where the food is placed to be cooked.

4. When the cooking time is up, a signal tone is heard and the relays RY1+RY2 open. The circuits to the oven lamp, high voltage transformer, fan motor and turntable motor are cut off.

5. When the door is opened during a cook cycle, the switches come to the following condition.

CONDITION DURING DOOR OPEN

SWITCH CONTACT COOKING

(NO COOKING)

1st. interlock switch COM-NO Closed Open Monitor switch COM-NC Open Closed 2nd. interlock relay control switch

COM-NO Closed Open

The circuits to the high voltage transformer, fan motor turntable motor, and the oven lamp are cut off when the 1st. interlock switch (SW1) and 2nd. interlock relay

control switch (SW3) are made open.

6. MONITOR SWITCH CIRCUIT The monitor switch (SW2) is mechanically controlled by oven door, and monitors the operation of the 1st. interlock switch (SW1).

6-1 When the oven door is opened during or after the

cycle of a cooking program, the 1st. interlock switch (SW1) and 2nd. interlock relay control switch (SW3) must open their contacts first. After that the contacts (COM-NC) of the monitor switch (SW2) can be closed.

6-2. When the oven door is closed, the contacts (COM-

NC) of the monitor switch (SW2) must be opened first. After that the contacts (COM-NO) of the 1st. interlock switch (SW1) and 2nd. interlock relay control switch (SW3) are closed.

6-3. When the oven door is opened and the contacts

(COM-NO) of the 1st. interlock switch (SW1) remain closed, the fuse F will blow, because the contacts (COM-NC) of the monitor switch are closed and a short circuit is caused.

560W, 400W, 240W, 80W COOKING

When the microwave oven is preset for variable cooking power, the line voltage is supplied to the high voltage transformer intermittently within a 32-seconds time base through the relay contact which is coupled with the current-limiting relay RY2. The following levels of microwave power are given.

SETTING;

NOTE: The ON/OFF time ratio does not exactly corre-

spond to the percentage of microwave power, because approx. 3 seconds are needed for heating up the magnetron filament.

POWER OUTPUT REDUCTION

After 100% power cooking mode is carried out for more than 20 minutes, the power output is automatically reduced to 70%. Even if the cooking time is shorter than for 20 minutes, the power output is reduced to 70% after total cooking time over 20 minutes when the oven is started in 100% power cooking mode again within 1 minute and 35 seconds.

32 sec. ON

Approx. 70%

100%

800W

560W

400W

240W

80W

24 sec. ON 8 sec. OFF

14 sec. OFF

10 sec. OFF

26 sec. OFF

Approx. 50%

18 sec. ON

Approx. 30%

12 sec. ON

Approx. 10%

6 sec. ON

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FUNCTION OF IMPORTANT COMPONENTS

If the food load is overcooked, by either error in cook time or defect in the control unit, the temperature fuse will open. Under normal operation, the temperature fuse remains closed. However, when abnormally high temperatures are reached within the oven cavity, the temperature fuse will open at 248˚F(120˚C), causing the oven to shut down.

TURNTABLE MOTOR (TTM)

The turntable motor drives the turntable roller assembly to rotate the turntable.

FAN MOTOR (FM)

The fan motor drives a blade which draws external cool air. This cool air is directed through the air vents surrounding the magnetron and cools the magnetron. This air is channelled through the oven cavity to remove steam and vapours given off from heating food. It is then exhausted through the exhausting air vents at the rear of the oven cavity.

NOISE FILTER

The noise filter assembly prevents radio frequency interference that might flow back in the power circuit.

DOOR OPEN MECHANISM

The door is opened by pushing the open button on the control panel, refer to the Figure D-1. When the open button is pushed, the open button pushes up the switch lever, and then the switch lever pushes up the latch head. The latch heads are moved upward and released from latch hook. Now the door will open.

Figure D-1. Door Open Mechanism

IST. INTERLOCK SWITCH (SW1) AND 2ND. INTERLOCK RELAY CONTROL SWITCH (SW3)

1. When the oven door is closed, the contacts (COM-NO) must be closed.

MONITOR SWITCH (SW2)

1. When the oven door is closed, the contacts (COM-NC) must be opened.

2. When the oven door is opened, the contacts (COMNC) must be closed.

3. If the oven door is opened and he contacts (COM-NO) of the ist. interlock switch (SW1) fail to open, the fuse F8A blows immediately after closing the contacts (COMNC) of the monitor switch (SW2).

CAUTION: BEFORE REPLACING A BLOWN FUSE F1

TEST IST. INTERLOCK SWITCH (SW1) AND MONITOR SWITCH (SW2) FOR PROPER OPERATION. (REFER TO CHAPTER “TEST PROCEDURE”).

FUSE (F1)

1. The fuse F1 blows when the contacts (COM-NO) of the 1st. interlock switch (SW1) remain closed with the oven door open and when the contacts (COM-NC) of the monitor switch (SW2) are closes.

2. If the wire harness or electrical components are shortcircuited, the fuse F8A blows to prevent an electric shock or fire hazard.

HIGH VOLTAGE FUSE (F2)

The high voltage fuse blows when the high voltage rectifier or the magnetron is shorted.

TEMPERATURE FUSE (TF)

The temperature fuse, located on the top of the oven cavity, is designed to prevent damage to the oven by fire.

Latch Heads

Latch Hook

Door

SW3: 2nd. Interlock Relay Control Switch

SW2: Monitor Switch

Switch Lever

SW1: 1st. Interlock Switch

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R-204(W)

When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter which will be found in the “Test Procedure” section.

IMPORTANT: If the oven becomes inoperative because

of a blown fuse F1. Check the ist. interlock switch (SW1), monitor switch(SW2) and 2nd. interlock relay (RY2) before replacing the F1 fuse.

TROUBLESHOOTING GUIDE

CONDITION PROBLEM

ABCD EEE FG H IIJKLLM

Home fuse blows when power cord is plugged into wall outlet.

Fuse F8A blows when power cord is plugged into wall outlet. (Timer off)

Oven does not operate at all. Timer is not set but when door

closed, oven starts operation. Oven does not start when timer

knob is turned, door closed. Oven lamp does not light, when in

operation. Fan motor does not operate. Turntable motor assembly does

not operate. Oven or electrical parts does not

stop when timer knob is at "0". Oven seems to be operating but

little or no heat is produced in oven load. (Microwave power level is set at 800W.)

Oven does not operate properly during the variable cooking condition except 800w cooking condition.

Oven goes into cook cycle but shuts down before end of cooking cycle.

Oven stops as soon as the oven is started.

Fan motor, oven lamp and turntable motor do not operate at the same time.

OFF

CONDITION

COOKING

CONDITION

TEST PROCEDURE

POSSIBLE CAUSE

AND

DEFECTIVE PARTS

MAGNETRON

HIGH VOLTAGE TRANSFORMER

H.V. RECTIFIER

HIGH VOLTAGE CAPACITOR

1ST. INTERLOCK SWITCH (SW1)

2ND. INTERLOCK RELAY CONTROL SWITCH (SW3)

MONITOR SWITCH (SW2)

TEMPERATURE FUSE 120˚C

FUSE F1

NOISE FILTER

FAN MOTOR

TURNTABLE MOTOR

POWER SUPPLY CORD

OVEN LAMP

SHORTED WIRE HARNESS

OPENED WIRE HARNESS

MIS-ADJUSTMENT SWITCHES

NO POWER AT WALL OUTLET

HIGH VOLTAGE FUSE

CONTROL UNIT

RELAY RY1

RELAY RY2

FOIL PATTERN ON P.W.B.

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R-204(W)

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

A MAGNETRON TEST

CARRY OUT 3D CHECKS. Isolate the magnetron from the high voltage circuit by removing all leads connected to the filament

terminal. To test for an open circuit filament use an ohmmeter to make a continuity test between the magnetron

filament terminals, the meter should show a reading of less than 1 ohm. To test for a short circuit filament to anode condition, connect ohmmeter between one of the filament

terminals and the case of the magnetron (ground). This test should be indicated an infinite resistance. If a low or zero resistance reading is obtained then the magnetron should be replaced.

MICROWAVE OUTPUT POWER (IEC60705)

The following test procedure should be carried out with the microwave oven in a fully assembled condition (outer case fitted). Microwave output power from the magnetron can be measured by IEC test procedure, i.e. it can be measured by using water load how much it can be absorbed by the water load. To measure the microwave output power in the microwave oven, the relation of calorie and watt is used. When P(W) heating works for t(second), approximately P x t/4.187 calorie is generated. On the other hand, if the temperature of the water with V(ml) rises ∆T (˚C) during this microwave heating period, the calorie of the water is V x ∆T.

The formula is as follows;

P x t / 4.187 = V x ∆ T+ 0.55 x mc (T2-T0)/4.187P (W) = 4.187 x V x ∆T / t + 0.55 x mc (T2-T0)/t Our condition for water load is as follows:

Room temperature (T0) ... around 20°C Power supply Voltage ..............Rated voltage

Water load..................................1000 g Initial temperature (T1) ...................... 10±1°C

Heating time.............................. 52 sec. Mass of container (mc) ......................... 330 g

T2............................ Final Temperature P = 80 x ∆T + 0.55 x mc (T2-T0)/52

Measuring condition:

1. Container The water container must be a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190 mm.

2. Temperature of the oven and vessel The oven and the empty vessel are at ambient temperature prior to the start of the test.

3. Temperature of the water The initial temperature of the water is (10±2)˚C.

4. Select the initial and final water temperature so that the maximum difference between the final water temperature and the ambient temperature is 5˚C.

5. Select stirring devices and measuring instruments in order to minimize addition or removal of heat.

6. The graduation of the thermometer must be scaled by 0.1˚C at minimum and an accurate thermometer.

7. The water load must be (1000±5) g.

8. “t” is measured while the microwave generator is operating at full power. Magnetron filament heat- up time is not included.

NOTE: The operation time of the microwave oven is “t + 3” sec. 3 sec. is magnetron filament heat-up

time.

Measuring method:

1. Measure the initial temperature of the water before the water is added to the vessel. (Example: The initial temperature T1 = 11˚C)

2. Add the 1 litre water to the vessel.

3. Place the load on the centre of the shelf.

4. Operate the microwave oven at HIGH for the temperature of the water rises by a value ∆ T of 10 ˚C.

5. Stir the water to equalize temperature throughout the vessel.

6. Measure the final water temperature. (Example: The final temperature T2 = 21°C)

7. Calculate the microwave power output P in watts from above formula.

NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION.

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TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

Room temperature ....................... To = 21˚C Initial temperature .................... T1 = 11°C

Temperature after (52 + 3) = 55 sec. ..................................................................... T2 = 21°C

Temperature difference Cold-Warm ................................................................... ∆T1 = 10°C

Measured output power

The equation is “P = 80 x ∆T” ...................................................... P = 80 x 10°C = 800 Watts

JUDGEMENT: The measured output power should be at least ± 15 % of the rated output power.

CAUTION: 1°C CORRESPONDS TO 80 WATTS. REPEAT MEASUREMENT IF THE POWER IS

INSUFFICIENT.

Heat up for 55 sec.

B HIGH VOLTAGE TRANSFORMER TEST

WARNING: High voltage and large currents are present at the secondary winding and

filament winding of the high voltage transformer. It is very dangerous to work near this part when the oven is on. NEVER make any voltage measurements of the high-voltage circuits, including the magnetron filament.

CARRY OUT 3D CHECKS. Disconnect the leads to the primary winding of the high voltage transformer. Disconnect the filament and secondary winding connections from the rest of the HV circuitry. Using an ohmmeter, set on a low range, it is possible to check the continuity of all three winding. The following readings should be obtained:-

a. Primary winding .......................... 2.4 ohms approximately

b. Secondary winding .................... 185 ohms approximately

c. Filament winding..................................... less than 1 ohm

If the readings obtained are not stated as above, then the high voltage transformer is probably faulty and should be replaced. CARRY OUT 4R CHECKS.

C HIGH VOLTAGE RECTIFIER TEST

CARRY OUT 3D CHECKS. Isolate the high voltage rectifier assembly from the HV circuit. The high voltage rectifier can be tested using an ohmmeter set to its highest range. Connect the ohmmeter across the terminal of the high voltage rectifier and note the reading obtained. Reverse the meter leads and note this second reading. The normal resistance is infinite in one direction and more than 100 kΩ in the other direction.

CARRY OUT 4R CHECKS. NOTE: FOR MEASUREMENT OF THE RESISTANCE OF THE RECTIFIER, THE BATTERIES OF

THE MEASURING INSTRUMENT MUST HAVE A VOLTAGE AT LEAST 6 VOLTS, BECAUSE OTHERWISE AN INFINITE RESISTANCE MIGHT BE SHOWN IN BOTH DIRECTIONS.

CARRY OUT 3D CHECKS. A. Isolate the high voltage capacitor from the circuit.

B. Continuity check must be carried out with measuring instrument which is set to the highest

resistance range.

D HIGH VOLTAGE CAPACITOR TEST

1000g

T1˚C

T2˚C

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F TEMPERATURE FUSE TEST

CARRY OUT 3D CHECKS. A continuity check across the temperature fuse terminals should indicate a closed circuit unless the

temperature of the temperature fuse reaches approximately 248˚F(120˚C). An open temperature fuse indicates overheating of the oven, exchange the temperature fuse and

check inside of oven cavity and for improper setting of cooking time or operation of control unit. Check for restricted air flow through the vent holes of the oven cavity, especially the cooling fan and air guide.

CARRY OUT 4R CHECKS.

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

C. A normal capacitor shows continuity for a short time (kick) and then a resistance of about 10MΩ

after it has been charged. D. A short-circuited capacitor shows continuity all the time. E. An open capacitor constantly shows a resistance about 10 MΩ because of its internal 10MΩ

resistance. F. When the internal wire is opened in the high voltage capacitor, the capacitor shows an infinite

resistance. G. The resistance across all the terminals and the chassis must be infinite when the capacitor is

normal. If incorrect reading are obtained, the high voltage capacitor must be replaced.

CARRY OUT 4R CHECKS.

E SWITCH TEST

Table: Terminal Connection of Switch

Plunger Operation COM to NO COM to NC

Released Open circuit Short circuit Depressed Short circuit Open circuit

COM; Common terminal, NO; Normally open terminal NC; Normally close terminal

If incorrect readings are obtained, make the necessary switch adjustment or replace the switch. CARRY OUT 4R CHECKS.

CARRY OUT 3D CHECKS. Isolate the switch to be tested and using an ohmmeter check between the terminals as described in the following table.

G BLOWN FUSE F1

CARRY OUT 3D CHECKS.

1. If the fuse F1 is blown, there could be a shorts or grounds in electrical parts or wire harness. Check them and replace the defective parts or repair the wire harness.

2. If the fuse F1 is blown when the door is opened, check the 1st. interlock switch (SW1), monitor switch (SW2) and 2nd. interlock relay (RY2).

If the fuse F1 is blown by incorrect door switching replace the defective switch(es) and the fuse F8A.

CARRY OUT 4R CHECKS.

CAUTION: Only replace fuse with the correct value replacement.

H NOISE FILTER TEST

CARRY OUT 3D CHECKS. Disconnect the leads from the terminals of noise filter.

Using an ohmmeter, check between the terminals as described in the following table.

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TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

MEASURING POINTS INDICATION OF OHMMETER

Between N and L Approx. 680 kΩ Between terminal N and WHITE Short circuit Between terminal L and RED Short circuit

If incorrect readings are obtained, replace the noise filter unit. CARRY OUT

4R CHECKS.

I MOTOR WINDING TEST

CARRY OUT 3D CHECKS. Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the two

terminals as described in the table below.

Table: Resistance of Motor

Motors Resistance Fan motor Approximately 400 Ω Turntable motor Approximately 12 kΩ

If incorrect readings are obtained, replace the motor. CARRY OUT 4R CHECKS.

FUSE M8A

F1:

LINE CROSS CAPACITOR

0.068µ/AC250V

NOISE SUPPRESSION COIL

LINE BYPASS CAPACITOR

0.0022µ/AC250V

LINE BYPASS CAPACITOR

0.0022µ/AC250V

NOISE FILTER

WHT RED

CARRY OUT 3D CHECKS. If the high voltage fuse is blown, there could be a short in the high voltage rectifier or the magnetron. Check them and replace the defective parts and the high voltage fuse.

CARRY OUT 4R CHECKS. CAUTION: ONLY REPLACE HIGH VOLTAGE FUSE WITH THE CORRECT VALUE REPLACE-

MENT.

J HIGH VOLTAGE FUSE TEST

K CONTROL PANEL ASSEMBLY TEST

The control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore, unlike conventional microwave ovens, proper maintenance can not be performed with only a voltmeter and ohmmeter. In this service manual, troubleshooting by replacement is described according to the symptoms indicated.

1. Control Panel The following symptoms indicate a defective control unit.

1-1 In connection with LEDs

a) At a certain LED, all or some LEDs do not light up. b) At a certain LED, brightness is low. c) Only one LED does not light up. d) All or some LEDs continue to light up. e) A certain group of LEDs do not light up. f) The LEDs flicker.

1-2 Tact switch

a) When touching a tact switch, a tact switch produces no signal.

1-3 Other possible troubles caused by defective control unit.

a) Buzzer does not sound or continues to sound. b) Cooking is not possible. c) Cooking time can not be set. d) Power level can not be set.

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R-204(W)

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

L RELAY TEST

CARRY OUT

3D CHECKS.

Remove the outer case and check voltage between Pin No. 3 of the 2 pin connector (A) and the common terminal of the relay RY2 on the control unit with an A.C. voltmeter. The meter should indicate 230 volts, if not check oven circuit.

Relay Test Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.

DC. voltage indicated.......... Defective relay.

DC. voltage not indicated.... Check diode which is connected to the relay coil. If diode is good,

control unit is defective.

RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS

RY1 Approx. 12.0V D.C. Oven lamp / Turntable motor / Fan motor RY2 Approx. 11.0V D.C. High voltage transformer

CARRY OUT 4R CHECKS.

M PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING

BOARD(PWB) IS OPEN

To protect the electronic circuits, this model is provided with a fine foil pattern added to the input circuit on the PWB, this foil pattern acts as a fuse. If the foil pattern is open, follow the troubleshooting guide given below for repair. Problem: POWER ON, indicator does not light up.

CARRY OUT 3D CHECKS.

STEPS OCCURRENCE CAUSE OR CORRECTION

1 The rated AC voltage is not present between Check supply voltage and oven power cord.

Pin No, 3 of the 2-pin connector CN-A and the common terminal of the relay RY2.

2 The rated AC voltage is present at primary Low voltage transformer or secondary circuit defective.

side of low voltage transformer. Check and repair.

3 Only pattern at "a" is broken. *Insert jumper wire J1 and solder.

(CARRY OUT 3D CHECKS BEFORE REPAIR)

4 Pattern at "a" and "b" are broken. *Insert the coil RCILF2003YAZZ between "c" and "d".

(CARRY OUT 3D CHECKS BEFORE REPAIR)

NOTE: *At the time of these repairs, make a

visual inspection of the varistor for burning damage and examine the transformer with tester for the presence of layer short circuit (check primary coil resistance). If any abnormal condition is detected, replace the defective parts.

CARRY OUT 4R CHECKS.

VRS1

RY1

CNA

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R-204(W)

Control Unit

Control unit consists of LSI, power source circuit, synchronizing signal circuit, ACL circuit, buzzer circuit, encoder circuit, indicator circuit and potentiometer circuit.

1) LSI

This LSI controls the encoder signal, tact switch strobe signal, relay driving signal for oven function, buzzer signal and LED signal.

2) Power Source Circuit

This circuit generates voltage necessary in the control unit.

Symbol Voltage Application

VC -5.0V LSI(I-1)

3) Synchronizing Signal Circuit

The power source synchronizing signal is available in order to compose a basic standard time in the clock circuit. It accompanies a very small error because it works on commercial frequency.

4) ACL

A circuit to generate a signals which resets the LSI to the initial state when power is supplied.

CONTROL PANEL ASSEMBLY

OUTLINE OF CONTROL PANEL

5) Buzzer Circuit

The buzzer is responsive to signals from the LSI to emit audible sounds (tact switch touch sound and completion sound).

6) 2nd. Interlock Relay Control Switch

A switch to "tell" the LSI if the door is open or closed.

7) Relay Circuit

To drive the magnetron, fan motor, turntable motor and light the oven lamp.

8) Encoder

The encoder generates the pulse signal, and the pulse signal is sent to the LSI.

9) Indicator Circuit

Indicator elements are the Light-emitting diodes (LD1LD24). This circuit consists of 4-digits and 6 segments.

10) Potentiometer Circuit

The circuit makes setting of the power level by variable resistance.

DESCRIPTION OF LSI

LSI

The I/O signal of the LSI are detailed in the following table.

Pin No. Signal I/O Description

1 VDD IN Power source voltage: 0V.

Connected to 0V.

2 VSS IN Power source voltage: -5V.

Connected to -5V.

3 XIN IN Internal clock oscillation frequency input setting.

The internal clock frequency is generated by connecting the capacitor and resistor

to XIN. 4 XOUT OUT Terminal not used. 5 CNVSS IN Connected to VSS through resistor R5. 6 RESET IN Auto clear terminal.

Signal is input to reset the LSI to the initial state when power is applied. 7 P21 IN Signal to synchronize LSI with commercial power source frequency.

This is basic timing for all real time

processing of LSI.

20 msec

H : GND

L : -5V

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R-204(W)

Pin No. Signal I/O Description

8 P20 OUT

Magnetron high-voltage circuit driving signal.

To turn on and off the cook relay (RY2). The signal holds "L" level during microwave cooking and "H" level while not cooking. In other cooking modes (70%, 50%, 30%, 10%) the signal turns to "H" level and "L" level in repetition according to the power level.

9 D5 OUT Digit selection signal.

Signal is input to the anodes of the light-emitting diodes (LD19 - LD24).

10 D4 OUT Digit selection signal.

Signal is input to the anodes of the light-emitting diodes (LD13 - LD18).

11 D3 OUT Digit selection signal.

Signal is input to the anodes of the light-emitting diodes (LD7 - LD12).

12 D2 OUT Segment data signal.

Signal is input to the cathodes of the light-emitting diodes (LD6, LD12, LD18 and LD24).

13 D1 OUT Segment data signal.

Signal is input to the cathodes of the light-emitting diodes (LD5, LD11, LD17 and LD23).

14 D0 OUT Segment data signal.

Signal is input to the cathodes of the light-emitting diodes (LD4, LD10, LD16 and LD22).

15 INT IN Signal coming from encoder.

When the encoder is turned, the contacts of encoder make pulse signals. And pulse signals are input into INT.

16 CNTR OUT Signal to sound buzzer.

Completion sound.

17 P11 IN Signal coming from encoder.

Signal similar to INT. Pulse signals are input into P11.

18 P10 OUT Oven lamp, turntable motor and fan motor driving signal (Square Waveform

: 50Hz).

To turn on and off shut-off relay (RY1). The square waveform voltage is delivered to the relay (RY1) driving circuit and relay(RY2) control circuit.

19 P03 OUT Digit selection signal.

Signal is input to the anodes of the light-emitting diodes (LD1 - LD6).

20 P02 OUT Segment data signal.

Signal is input to the cathodes of the light-emitting diodes (LD3, LD9, LD15 and LD21).

21 P01 OUT Segment data signal.

Signal is input to the cathodes of the light-emitting diodes (LD2, LD8, LD14 and LD20).

22 P00 OUT Segment data signal.

Signal is input to the cathodes of the light-emitting diodes (LD1, LD7, LD13 and LD19).

23 AIN3 IN Signal coming from potentiometer.

By inputting DC voltage corresponding to the power level set by the potentiometer, this input is converted into the power level by the A/D converter built into the LSI.

24 AIN2 IN Input signal which communicates the door open/close information to LSI.

Door closed; "H" level signal. Door opened; "L" level signal.

ON/OFF time ratio in Micro cooking (a. 32second time base)

MICRO ON OFF COOK 100% 32sec. 0sec. 70% 24sec. 8sec. 50% 18sec. 14sec. 30% 12sec. 20sec. 10% 6sec. 26sec.

H: GND

L: -5V

2.0 sec

20 msec

During cooking

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R-204(W)

SERVICING

As for the sensor-related controls of the touch control panel, checking them is possible if the dummy resistor(s) with resistance equal to that of the controls are used.

(2) Servicing the touch control panel with power

supply from an external power source:

Disconnect the touch control panel completely from the oven proper, and short both ends of the door sensing switch (on PWB) of the touch control panel, which brings about an operational state that is equivalent to the oven door being closed. Connect an external power source to the power input terminal of the touch control panel, then it is possible to check and repair the controls of the touch control panel; it is also possible to check the sensor-related controls of the touch control panel by using the dummy resistor(s).

3. Servicing Tools

Tools required to service the touch control panel assembly.

1) Soldering iron: 30W (It is recommended to use a soldering iron with a grounding terminal.)

2) Oscilloscope: Single beam, frequency range: DC 10MHz type or more advanced model.

3) Others: Hand tools

4. Other Precautions

1) Before turning on the power source of the control unit, remove the aluminium foil applied for preventing static electricity.

2) Connect the connector of the key unit to the control unit being sure that the lead wires are not twisted.

3) After aluminium foil is removed, be careful that abnormal voltage due to static electricity etc. is not applied to the input or output terminals.

4) Attach connectors, electrolytic capacitors, etc. to PWB, making sure that all connections are tight.

5) Be sure to use specified components where high precision is required.

1. Precautions for Handling Electronic Components

This unit uses CMOS LSI in the integral part of the circuits. When handling these parts, the following precautions should be strictly followed. CMOS LSI have extremely high impedance at its input and output terminals. For this reason, it is easily influenced by the surrounding high voltage power source, static electricity charge in clothes, etc., and sometimes it is not fully protected by the built-in protection circuit. In order to protect CMOS LSI.

1) When storing and transporting, thoroughly wrap them in aluminium foil. Also wrap PW boards containing them in aluminium foil.

2) When soldering, ground the technician as shown in the figure and use grounded soldering iron and work table.

2. Servicing of Touch Control Panel

We describe the procedures to permit servicing of the touch control panel of the microwave oven and the precautions you must take when doing so. To perform the servicing, power to the touch control panel is available either from the power line of the oven itself or from an external power source.

(1)Servicing the touch control panel with power

supply of the oven : CAUTION:

THE HIGH VOLTAGE TRANSFORMER OF THE MICROWAVE OVEN IS STILL LIVE DURING SERVICING AND PRESENTS A HAZARD .

Therefore, when checking the performance of the touch control panel, put the outer cabinet on the oven to avoid touching the high voltage transformer, or unplug the primary terminal (connector) of the high voltage transformer to turn it off; the end of such connector must be insulated with an insulating tape. After servicing, be sure to replace the leads to their original locations.

A. On some models, the power supply cord be-

tween the touch control panel and the oven itself is so short that the two can't be separated.

For those models, check and repair all the controls (sensor-related ones included) of the touch control panel while keeping it connected to the oven.

B. On some models, the power supply cord be-

tween the touch control panel and the oven proper is so long enough that they may be separated from each other. For those models, therefore, it is possible to check and repair the controls of the touch control panel while keeping it apart from the oven proper; in this case you must short both ends of the door sensing switch (on PWB) of the touch control panel with a jumper, which brings about an operational state that is equivalent to the oven door being closed.

approx. 1M ohm

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COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below

before operating the oven.

1. Disconnect oven from power supply.

2. Make sure that a definite” click” can be heard when the microwave oven door is unlatched. (Hold the door in a closed position with one hand, then push the door open button with the other, this causes the latch leads to rise, it is then possible to hear a “click’ as the door switches operate.)

3. Visually check the door and cavity face plate for damage (dents, cracks, signs of arcing etc.).

Carry out any remedial work that is necessary before operating the oven. Do not operate the oven if any of the following conditions exist;

1. Door does not close firmly.

2. Door hinge, support or latch hook is damaged.

3. The door gasket or seal is damaged.

4. The door is bent or warped.

5. There are defective parts in the door interlock system.

6. There are defective parts in the microwave generating and transmission assembly.

7. There is visible damage to the oven.

Do not operate the oven:

1. Without the RF gasket (Magnetron).

2. If the wave guide or oven cavity are not intact.

3. If the door is not closed.

4. If the outer case (cabinet) is not fitted.

Please refer to ‘OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS’, when carrying out any of the following removal procedures:

WARNING FOR WIRING

To prevent an electric shock, take the following manners.

1. Before wiring,

1) Disconnect the power supply.

2) Open the door and wedge the door open.

3) Discharge the high voltage capacitor and wait for 60 seconds.

2. Don't let the wire leads touch to the following parts;

1) High voltage parts: Magnetron, High voltage transformer, High voltage capacitor, High voltage rectifier assembly and High voltage fuse.

2) Hot parts: Oven lamp, Magnetron, High voltage transformer

and Oven cavity.

3) Sharp edge: Oven cavity, Waveguide flange, other metallic plate.

4) Movable parts (to prevent a fault) Fan blade, Fan motor, Switch and Turntable motor.

3. Do not catch the wire leads in the outer case cabinet.

4. Insert the positive lock connector certainly until its pin is locked. And make sure that the wire leads should not come off even if the wire leads is pulled.

5. To prevent an error function, connect the wire leads correctly, referring to the Pictorial Diagram.

3) Discharge high voltage capacitor.

REMEMBER TO CHECK 3D

1) Disconnect the supply.

2) Door opened, and wedged open.

To To remove the outer case, procedure as follows.

1. Disconnect the power supply cord.

2. Open the oven door and block it open.

3. Remove the two (2) screws along the right side of the outer case.

4. Remove the remaining five (5) screws from the rear of the outer case.

5. Slide the entire outer case back out about 1 inch (3 cm) to free it from retaining clips on the cavity face plate.

6. Lift entire outer case from the unit.

7. Discharge the H. V. capacitor before curring out any

OUTER CASE REMOVAL

further work.

8. Do not operate the oven with the outer case removed.

NOTE: Step 1, 2 and 7 from the basis of the 3D checks.

CAUTION:1. DISCONNECT OVEN FROM POWER

SUPPLY BEFORE REMOVING OUTER CASE.

2. DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.

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MAGNETRON REMOVAL

1. CARRY OUT 3D CHECKS.

2. Disconnect the wire leads from magnetron.

3. Remove the three (3) screws holding the magnetron to the waveguide.

4. Remove the magnetron from waveguide.

5. Now, the magnetron is free. CAUTION: WHEN REPLACING THE MAGNETRON,

BE SURE THE R.F. GASKET IS IN PLACE AND THE MAGNETRON MOUNTING SCREWS ARE TIGHTENED SECURELY.

To remove the components, proceed as follows.

1. CARRY OUT 3D CHECKS.

2. Remove one (1) screw holding capacitor holder to rear cabinet.

3. Disconnect the H.V. wire of the H.V. rectifier assembly from the magnetron.

4. Disconnect the filament lead of the power transformer from the H.V. capacitor.

5. Remove one (1) screw holding ground side terminal of high voltage rectifier assembly, and remove capacitor holder.

6. Disconnect all the leads and terminals of high voltage

rectifier assembly from high voltage capacitor.

7. Now the H.V. rectifier assembly and H.V. capacitor should be free.

CAUTION: WHEN REPLACING HIGH VOLTAGE REC-

TIFIER ASSEMBLY, ENSURE THAT THE CATHODE (GROUND) CONNECTION IS SECURELY FIXED TO THE CAPACITOR HOLDER WITH A GROUNDING SCREW.

CAUTION: DO NOT REPLACE ONLY HIGH VOLT-

AGE RECTIFIER. WHEN REPLACING IT, REPLACE HIGH VOLTAGE RECTIFIER ASSEMBLY.

HIGH VOLTAGE COMPONENTS REMOVAL

(HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY)

1. CARRY OUT 3D CHECKS.

2. Disconnect the wire leads (main wire harness) from power transformer.

3. Disconnect the lead from magnetron filament.

4. Disconnect the leads of the power transformer from high voltage capacitor.

5. Remove the two (2) screws holding the transformer to bottom plate from the upper side.

6. Remove the remaining two (2) screws from the bottom.

7. Remove the transformer.

8. Now the power transformer is free.

Re-install

1. Rest transformer on the bottom plate with its primary terminals toward the oven face plate.

2. Secure transformer with four (4) screws to the bottom plate.

3. Re-connect wire leads (primary and high voltage) and filament leads to the power transformer, magnetron and high voltage capacitor, referring to "Pictorial Diagram".

4. Re-install outer case and check that the oven is operating properly.

POWER TRANSFORMER REMOVAL

1. CARRY OUT 3D CHECKS.

2. Push the lever of positive lock® connector.

3. Pull down on the positive lock® connector.

CAUTION: WHEN CONNECTING THE POSITIVE

LOCK® CONNECTORS TO THE TERMINALS, INSTALL THE POSITIVE LOCK® SO THAT THE LEVER FACES YOU

POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL

Figure C-1. Positive lock® connector

1. CARRY OUT 3D CHECKS.

2. Disconnect the leads from the control unit.

3. Remove the one (1) screw holding the control panel to

Terminal

Push

Pull down

Lever

Positive lock® connector

CONTROL PANEL ASSEMBLY REMOVAL

the front plate of the oven cavity.

4. Now, the control panel assembly is free.

Page 22

R-204(W)

TURNTABLE MOTOR REMOVAL

COOLING FAN MOTOR REMOVAL

REMOVAL

1. CARRY OUT 3D CHECKS.

2. Remove the magnetron from the waveguide. Refer to chapter "MAGNETRON REMOVAL"

3. Disconnect the wire lead from the C/T fuse.

4. Remove the one (1) screw to get the C/T fuse off.

5. Disconnect the wire leads from the fan motor.

6. Disconnect the wire lead from the disconnect the fan duct.

7. Remove the three (3) screws holding the fan duct to the oven cavity.

8. Release the fan motor assembly from the oven cavity.

9. Remove the fan blade from the fan motor shaft according to the following procedure.

10.Hold the edge of the rotor of the fan motor by using a pair of groove joint pliers.

CAUTION:

• Make sure that any pieces do not enter the gap

between the rotor and the stator of the fan motor. Because the rotor is easy to be shaven by pliers and metal pieces may be produced.

• Do not touch the pliers to the coil of the fan motor

because the coil may be cut or injured.

• Do not disfigure the bracket by touching with the

pliers.

11.Remove the fan blade assembly from the shaft of the fan motor by pulling and rotating the fan blade with your hand.

12.Now, the fan blade will be free.

CAUTION:

• Do not re-use the removed fan blade because

Rear view Side view

Removal

1. Disconnect the oven from the power supply.

2. Remove the turntable and turntable support from the oven cavity.

3. Turn the oven over.

4. Remove the one (1) screw holding the turntable motor cover to the bottom plate.

5. Now, the turntable motor cover is free.

6. Disconnect the wire leads from the turntable motor.

7. Remove the single (1) screw holding the turntable motor to the oven cavity.

8. Remove the turntable motor from the oven cavity.

9. Remove the TTM packing from the turntable motor.

10.Now, the turntable motor is free.

Re-install

1. Re-install the TTM packing.

2. Re-install the turntable motor with theTTM packing with the single (1) screw.

3. Re-connect the wire leads to the turntable motor.

4. Insert the tab of the turntable motor cover into the hole of the bottom plate.

5. Re-install the turntable motor cover to the bottom plate with one (1) screw.

Figure C-2. TTM packing Installation

TTM packing

Turntable motor

the hole (for shaft) may be larger than normal.

13.Remove the two (2) screws holding the fan motor to the fan duct.

14.Now, the fan motor is free.

INSTALLATION

1. Install the fan motor to the fan duct with the two (2) screws.

2. Install the fan blade to the fan motor shaft according to the following procedure.

3. Hold the center of the bracket which supports the shaft of the fan motor on the flat table.

4. Apply the screw lock tight into the hole (for shaft) of the fan blade.

5. Install the fan blade to the shaft of fan motor by pushing the fan blade with a small, light weight, ball peen hammer or rubber mallet.

CAUTION:

• Do not hit the fan blade strongly when installed

because the bracket may be transformed.

• Make sure that the fan blade rotates smooth after

installed.

• Make sure that the axis of the shaft is not slanted.

6. Install the fan motor assembly to the oven cavity with three (3) screws.

7. Re-install the C/T fuse to the oven cavity with the one (1) screw.

8. Install the magnetron with three (3) screws.

9. Re-install the wire leads of the fan duct.

10.Connect the wire leads to the magnetron and the fan motor, referring to the pictorial diagram.

Gap

Rotor

Bracket

Stator

Groove joint pliers

Coil

Shaft

Axis

Stator

Rotor

These are the positions that should be pinched with pliers.

Shaft

Table

Center of bracket

Page 23

R-204(W)

POWER SUPPLY CORD REPLACEMENT

Removal

1. CARRY OUT 3D CHECKS.

2. Remove the single (1) screw holding the green/yellow wire to the oven cavity.

3. Disconnect the leads of the power supply cord from the noise filter, referring to the Figure C-3 (a).

4. Release the moulding cord stopper of the power supply cord from the square hole of the oven cavity back plate, referring to the Figure C-3 (b).

5. Now, the power supply cord is free.

Re-install

1. Insert the moulding cord stopper of power supply cord into the square hole of the rear cabinet, referring to the Figure C-3 (b).

2. Install the earth wire lead of power supply cord and the earth angle to the oven cavity with one (1) screw and tight the screw.

3. Connect the brown and blue wire leads of power supply cord to the noise filter correctly, referring to the Pictorial Diagram.

1. CARRY OUT 3D CHECKS.

2. Disconnect wire leads from the switches.

3. Remove two (2) screws holding latch hook to oven flange.

4. Remove the switch lever from the oven cavity

5. Remove latch hook assembly from oven flange.

6. Push outward on the two (2) retaining tabs holding switch in place.

7. Switch is now free.

1ST. INTERLOCK SWITCH (SW1), 2ND. INTERLOCK RELAY CONTROL SWITCH (SW3) AND

MONITOR SWITCH (SW2) REMOVAL

Re-install

1. Re-install each switch in its place. The secondary interlock/monitor switches are in the lower position and the door sensing switch is in the upper position.

2. Re-connect wire leads to each switch. Refer to pictorial diagram.

3. Secure latch hook (with two (2) mounting screws) to oven flange.

4. Install the switch lever to the oven cavity

5. Make sure that the monitor switch is operating properly and check continuity of the monitor circuit. Refer to chapter "Test Procedure" and Adjustment procedure.

1ST. INTERLOCK SWITCH (SW1), 2ND. INTERLOCK RELAY CONTROL SWITCH (SW3) AND

MONITOR SWITCH (SW2) ADJUSTMENT

Power Supply Cord

Oven Cavity Back Plate

Screw

Green/Yelow Wire

Brown Wire

Fuse

Blue Wire

Noise Filter

Power Supply Cord

Oven Cavity Back Plate

Square Hole

Moulding Cord Stopper

Figure C-3 (a). Power Supply Cord Replacement Figure C-3 (b) Power Supply Cord Replacement

1. CARRY OUT 3D CHECKS. If the 1st. interlock switch, 2nd. interlock relay control switch and monitor switch do not operate properly due to a misadjustment, the following adjustment should be made.

2. Loosen the two (2) screws holding latch hook to the oven cavity front flange.

3. With door closed, adjust latch hook by moving it back and forth, and up and down. In and out play of the door allowed by the upper and lower position of the latch hook should be less than 0.5mm. The vertical position of the latch hook should be adjusted so that the 1st. interlock switch and 2nd. interlock relay control switch are activated with the door closed. The horizontal position of the latch hook should be adjusted so that the plunger of the monitor switch is pressed with the door closed.

4. Secure the screws with washers firmly.

5. Check the operation of all switches. If each switch has not activated with the door closed, loosen screw and adjust the latch hook position.

Figure C-4. Latch Switch Adjustments

Latch Heads

Latch Hook

Door

SW3: 2nd. Interlock Relay Control Switch

SW2: Monitor Switch

Switch Lever

SW1: 1st. Interlock Switch

Page 24

R-204(W)

REMOVAL

1. Disconnect the oven from the power supply.

2. Open the door slightly.

3. Insert a putty knife (thickness of about 0.5mm) into the gap between the choke cover and corner portion of door panel as shown in Figure C-5 to free engaging parts.

4. Pry the choke cover by inserting a putty knife in order shown in figure C-5.

5. Release choke cover from door panel.

6. Now choke cover is free.

NOTE: When carrying out any repair to the door, do

not bend or warp the slit choke (tabs on the door panel assembly) to prevent microwave leakage.

Figure C-5. Door Disassembly

7. Release two (2) pins of door panel from two (2) holes of upper and lower oven hinges by lifting up.

8. Now, door panel is free from oven cavity.

9. Release door panel from ten (10) tabs of door frame and remove door frame by sliding the door panel downward.

10.Now, door panel with sealer film is free.

11.Tear sealer film from door panel.

12.Now, door panel is free.

13.Slide latch head upward and remove it from door frame with releasing latch spring from door frame and latch head.

14.Now, latch head and latch spring are free.

15.Remove door screen from door frame.

16.Now, door screen is free.

RE-INSTALL

1. Re-install door screen to door frame.

2. Re-install latch spring to the head. Re-install latch spring to the door frame. Re-install latch head to the door frame.

3. Re-install door panel to door frame by fitting ten (10) tabs of door frame to ten (10) holes of door panel.

4. Put sealer film on door panel. Refer to "Sealer Film" and figure C-7, on how to handle the new film.

DOOR REPLACEMENT

5. Catch two (2) pins of door panel on two (2) hole of upper and lower oven hinges.

6. Re-install choke cover to door panel by pushing.

Note: After any service to the door; (A) Make sure that 1st. interlock switch, 2nd. inter-

lock relay control switch and monitor switch are operating properly. (Refer to chapter "Test Procedures".).

(B) An approved microwave survey meter should be

used to assure compliance with proper microwave radiation emission limitation standards.

After any service, make sure of the following :

1. Door latch heads smoothly catch latch hook through latch holes and that latch head goes through center of latch hole.

2. Deviation of door alignment from horizontal line of cavity face plate is to be less than 1.0mm.

3. Door is positioned with its face pressed toward cavity face plate.

4. Check for microwave leakage around door with an approved microwave survey meter. (Refer to Microwave Measurement Procedure.)

Note: The door on a microwave oven is designed to act

as an electronic seal preventing the leakage of microwave energy from oven cavity during cook cycle. This function does not require that door be air-tight, moisture (condensation)-tight or lighttight. Therefore, occasional appearance of moisture, light or sensing of gentle warm air movement around oven door is not abnormal and do not of themselves, indicate a leakage of microwave energy from oven cavity.

Figure C-6. Door Replacement

After adjustment, check the following.

1. In and out play of door remains less than 0.5mm when in the latched position. First check upper position of latch hook, pushing and pulling upper portion of door toward the oven face. Then check lower portion of the latch hook, pushing and pulling lower portion of the door toward the oven face. Both results (play in the door) should be less than 0.5mm.

2. The 1st. interlock switch, 2nd. interlock relay control switch interrupt the circuit before the door can be opened.

3. Monitor switch contacts close when door is opened.

4. Re-install outer case and check for microwave leakage around door with an approved microwave survey meter. (Refer to Microwave Measurement Procedure.)

Choke Cover

Door Frame

Putty Knife

Upper Oven Hinge

Lower Oven Hinge

Choke Cover

Slit Choke

Door Panel

Page 25

R-204(W)

SEALER FILM

Installation

1. Put the adhesive tape on the backing film of the sealer film as shown in Fig. C-7.

2. Tear the backing film by pulling the adhesive tape.

3. Put the pasted side of the sealer film on the door panel

Figure C-7. Sealer film

Sealer film

Backing film

Adhesive tape

Page 26

R-204(W)

MICROW AVE MEASUREMENT

After adjustment of 1st. interlock switch, 2nd. interlock relay control switch, monitor switch and door are completed individually or collectively, the following leakage test must be performed with a survey instrument and it must be confirmed that the result meets the requirements of the performance standard for microwave oven.

REQUIREMENT

The safety switch must prevent microwave radiation emission in excess of 5mW/cm2 at any point 5cm or more from external surface of the oven.

PREPARATION FOR TESTING:

Before beginning the actual test for leakage, proceed as follows;

1. Make sure that the test instrument is operating normally as specified in its instruction booklet. Important: Survey instruments that comply with the requirement for instrumentations as prescribed by the performance standard for microwave ovens must be used for testing.

Recommended instruments are: NARDA 8100 NARDA 8200 HOLADAY HI 1500 SIMPSON 380M

2. Place the oven tray into the oven cavity.

3. Place the load of 275 ± 15ml of water initially at 20 ± 5˚C in the centre of the oven tray. The water container should be a low form of 600 ml beaker with inside diameter of approx. 8.5cm and made of an electrically non-conductive material such as glass or plastic. The placing of this standard load in the oven is important not only to protect the oven, but also to insure that any leakage is measured accurately.

4. Close the door and turn the oven ON with the timer set for several minutes. If the water begins to boil before the survey is completed, replace it with 275ml of cool water.

5. Move the probe slowly (not faster that 2.5cm/sec.) along the gap.

6. The microwave radiation emission should be measured at any point of 5cm or more from the external surface of the oven.

mW cm

Microwave leakage measurement at 5 cm distance

Page 27

R-204(W)

TEST DATA AT A GLANCE

PARTS SYMBOL VALUE / DATA Fuse F1 M 8A 250V Temperature fuse (OVEN) TF 120°C Oven lamp OL 240–250 V 25W High voltage capacitor C 0.91µF AC 2100V Magnetron MG Filament < 1Ω / Filament – chassis ∞ ohm. High voltage transformer T Filament winding < 1Ω

Secondary winding Approx. 185 Ω Primary winding Approx. 2.4 Ω

WARNING: DISCONNECT THE PLUG WHEN MEASURING RESISTANCE.

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. MICROWAVE POWER LEVEL 800W.

3. TIMER ON.

Figure O-2 Oven Schematic-ON Condition

Figure O-1 Oven Schematic-OFF Condition

NOTE: " " indicates components with potential above 250V.

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. TIMER OFF.

HIGH VOLTAGE

TRANSFORMER

MG: MAGNETRON

H.V. RECTIFIER

CAPACITOR

0.91µF

AC2100V

TURNTABLE MOTOR

FAN MOTOR

OVEN LAMP

SW2: MONITOR SWITCH

CONTROL

UNIT

2ND. INTERLOCK RELAY

2ND. INTERLOCK RELAY CONTROL SWITCH

1ST. INTERLOCK SWITCH

B2A3

TTM

TF: TEMPERATURE FUSE 120˚C (OVEN)

N.O.

RY-1

COM.

RY-2

MONITOR

RESISTOR

0.8/20W

EARTH

230V

50Hz

BLU

BRN

LIVENEUTRAL

G-Y

FUSE M8A

LINE CROSS CAPACITOR

0.068µ/AC250V

NOISE SUPPRESSION COIL

LINE BYPASS

CAPACITOR

0.0022µ/AC250V

LINE BYPASS

CAPACITOR

0.0022µ/AC250V

NOISE FILTER UNIT

H.V. FUSE

0.6A

F2:

F1:

SW1:

SW3:

HIGH VOLTAGE

TRANSFORMER

MG: MAGNETRON

H.V. RECTIFIER

CAPACITOR

0.91µF

AC2100V

TURNTABLE MOTOR

FAN MOTOR

OVEN LAMP

SW2: MONITOR SWITCH

CONTROL

UNIT

2ND. INTERLOCK RELAY

2ND. INTERLOCK RELAY CONTROL SWITCH

1ST. INTERLOCK SWITCH

B2A3

TTM

TF: TEMPERATURE FUSE 120˚C (OVEN)

N.O.

RY-1

COM.

RY-2

MONITOR

RESISTOR

0.8/20W

EARTH

230V

50Hz

BLU

BRN

LIVENEUTRAL

G-Y

FUSE M8A

LINE CROSS CAPACITOR

0.068µ/AC250V

NOISE SUPPRESSION COIL

LINE BYPASS

CAPACITOR

0.0022µ/AC250V

LINE BYPASS

CAPACITOR

0.0022µ/AC250V

NOISE FILTER UNIT

H.V. FUSE

0.6A

F2:

F1:

SW1:

SW3:

Page 28

R-204(W)

Figure S-1. Pictrorial Diagram

WHT

RED

HIGH VOLTAGE COMPONENTS

MG:

MAGNETRON

HIGH

VOLTAGE

CAPACITOR

H.V.

RECTIFIER

SW2: MONITOR

SWITCH

TTM:

TURNTABLE

MOTOR

FM:

FAN MOTOR

WHT

GRY

SW1: 1ST.

INTERLOCK

SWITCH

COM.

ORG

GRY

ORG

RED

WHT

BLK

N.C.

N.O.

GRY

RED

WHT

R: MONITOR RESISTOR

SW3:

2ND. INTERLOCK

RELAY CONTROL

SWITCH

GRY

T: HIGH VOLTAGE

TRANSFORMER

F2: HIGH VOLTAGE

FUSE

BLK

G/Y

EARTH

LIVE

NEUTRAL

POWER SUPPLY CORD

NOISE

FILTER

OCEN CAVITY

BACK PLATE

WHT

RED

PNK

WHT

CONTROL UNIT

GRY

ORG

RED

WHT

CN-A

CN-B

ORG

GRY

WHT

COM.

ORG

CN-A

CN-B

RY2

RY1

PNK

ORG

N.O.

OL: OVEN LAMP

TF: TEMPERATURE

FUSE (OVEN)

Page 29

R-204(W)

23456

123456

Figure S-2. Control Unit Circuit

A 3

C1 470µ/35v

D22D21

R40 3.3k

R10 1k 1/2w

C2 0.1µ/50v

C21

10µ/35v

SP1

ZD1 HZ6A3

ZD2 HZ4A2

R3 4.7k

R20 4.7k

6.8kF

R11 4.7k

IC-1

C61

C60

R61 10kR62 4.7k

R63 4.7k R60 10k

VR1 10kB

C10 0.1µ/50v

VRS1

(J1)

10G471K

D1-D4

1N4005E

R2 2k 1/2w

AC230V

50Hz

HIGH

VOLTAGE

TRANSFORMER

OVEN LAMP

FAN MOTOR

TURNTABLE

MOTOR

2ND.

INTERLOCK

RELAY

CONTROL

SWITCH

CN-A

CN-B

: IF NOT SPECIFIED, 1SS270A

: IF NOT SPECIFIED, 1/10W ± 5%

: IF NOT SPECIFIED, 0.01µF/ 50V

R1 100 2w

KTA1274

C4 47µ/16v

C5 0.1µ/50v

CNVSS

RESET

P21

INT

DOOR

P20

D5D4D3

XOUT

XIN

VSS

VDD AIN2

AIN3

P00

P01

P02

P03

P10

P11

CNTR

INT

P20

C20 0.1µ/50v

0.1µ/50v

R5 4.7k

R31 15k

R50 150 1/4w

R51 150 1/4w

R52 150 1/4w

R53 150 1/4w

R54 150 1/4w

R55 150 1/4w

LD5 LD11 LD17

LD23

LD4 LD10 LD16

LD22

LD3 LD9 LD15

LD21

LD2 LD8 LD14

LD20

LD1 LD7 LD13

LD19

LD6 LD12 LD18

LD24

R32 4.7k

C11

33pFCH/50v

C30

124

12 13

Q40

KRA101M

Q22

KRA101M

Q20

KRA101M

Q21

KRC243M

ZD3

HZ12A3

Q24

KTA1274

KRA117M

Q10

KRA101M

Q53

KRA222M

Q52

KRA222M

Q51

KRA222M

Q50

KRA222M

R30 15k

SW1

C31

RY2

RY1

D20 D30

COM

N O

A 1

B 1

NOTE

B 2

–

Page 30

R-204(W)

Figure S-3. Printed Wiring Board

23456

123456

FA701DR

R51

R50

R52

R54

R55

JP2

JP1

JP6

JP10

JP11

JP14

C21

JP18

Q20

Q21

D22

D21

VRS1

321

Q10

R10

ZD3

Q24

JP19

JP22

JP21

JP20

JP13

JP12

Q22

CNB

ZD2

321

D20 D20

VR1

DIP

JP4

JP3

R53

JP5

JP7 JP8

JP9

SW1

JP15

JP23

SP1

RY2

RY1

CNA

ZD1

Q40

JP16

JP17

Q53

Q52

Q51

Q50

E E

B B

CBA

Page 31

R-204(W)

* *

∆*

PARTS LIST

ELECTRIC PARTS

C RC-QZA211WRE0 High voltage capacitor 1 AV C RC-QZA285WRZZ High voltage capacitor (Interchangeable) 1 AW F1 QFS-CA010WRE0 Fuse M8A 1 AE F2 QFS-IA004WRE0 High voltage fuse 1 AK FM RMOTEA403WRZZ Fan motor 1 AZ FM RMOTEA340WRE0 Fan motor (Interchangeable) 1 AX MG RV-MZA306WRZZ Magnetron 1 BL OL RLMPTA083WRZZ Oven lamp 1 AM R RR-WZA022WRE0 Monitor resistor 0.8 ohm 20W 1 AK SW1 QSW-MA137WRE0 1st. interlock switch 1 AH SW2 QSW-MA138WRE0

Monitor switch

1AH SW3 QSW-MA137WRE0 2nd. interlock relay control switch 1 AH T RTRN-A650WRZZ High voltage transformer 1 BQ TF QFS-TA038WRE0 Temperature fuse 120˚C (Oven) 1 AK TTM RMOTDA173WRE0 Turntable motor 1 AX TTM RMOTDA226WRE0 Turntable motor (Interchangeable) 1 AT 1- 1 QACC-A075WRE0 Power supply cord 1 AW 1- 2 FPWBFA318WRK0

Noise filter

1AT 1- 3 FH-DZA102WRKZ High voltage rectifier assy 1 AN

CABINET PARTS

2- 1 GCABUA817WRPZ Outer case cabinet 1 BD 2- 2 GLEGPA074WRE0 Foot 2 AC 2- 3 PCUSUA409WRP0 Cushion 1 AD

CONTROL PANEL PARTS

3- 1 DPWBFC213WRUZ Control unit 1 BH 3- 2 HPNLCB684WRRZ Control panel 1 AZ 3- 3 HPNLTA156WREZ Timer sheet 1 AM 3- 4 JBTN-B151WRFZ Open button 1 AF 3- 5 JKNBKA660WRFZ Timer knob 1 AR 3- 6 JKNBKA661WRFZ Power change knob 1 AR 3- 7 MSPRCA050WRE0 Button spring 1 AB 3- 8 MSPRPA096WREZ Spring 1 AG 3- 9 XEPSD30P08XS0 Screw: 3mm x 8mm 4 AA

OVENPARTS

4- 1 PHOK-A122WRFZ Latch hook 1 AM 4- 2 LBNDKA038WRP0 Capacitor holder 1 AF 4- 3 NFANJA029WRE0 Fan blade 1 AK 4- 4 PDUC-A777WRPZ Fan duct 1 AP 4- 5 FOVN-A483WRTZ Oven cavity 1 BF 4- 6 GCOVHA425WRPZ Turntable motor cover 1 AK 4- 7 MLEVPA241WRFZ Switch lever 1 AG 4- 8 PCOVPA276WRE0 Waveguide cover 1 AM 4- 9 PCUSUA237WRP0 Cushion 2 AF 4-10 PPACGA176WREZ TTM packing 1 AC 4-11 PCUSUA278WRP0 Cushion 1 AB

DOORPARTS

5- 1 FDORFA348WRTZ Door panel assembly 1 BC 5- 2 GWAKPA818WRRZ Door frame 1 AZ 5- 3 HPNL-A764WREZ Door screen 1 AP 5- 4 LSTPPA205WRFZ Latch head 1 AF 5- 5 MSPRTA189WRE0 Spring 1 AE 5- 6 PSHEPA782WREZ Sealer film 1 AG 5- 7 GCOVHA424WRFZ Choke cover 1 AK

MISCELLANEOUS

6- 1 NTNT-A060WRE0 Turntable 1 AP 6- 2 FROLPA099WRKZ Turntable support 1 AP 6- 3 TCAUHA168WRR0 H caution label 1 AH 6- 4 FW-VZB849WREZ Main wire harness 1 AU 6- 5 TINSZA046WRRZ Instruction book 1 AN

SCREWS,NUTS AND WASHERS

7- 1 XHPSD40P08K00 screw : 4 mm x 8 mm 4 AC 7- 2 XHTSD40P08RV0 Screw : 4mm x 8mm 4 AA 7- 3 XOTSD40P08000 Screw : 4mm x 8mm 6 AA 7- 4 LX-CZ0052WRE0 Special screw 2 AA 7- 5 LX-EZA042WRE0 Special screw 2 AB 7- 6 XHPSD30P06000 Screw : 3mm x 6mm 1 AA

∆

Note: The parts marked "∆" may cause undue microwave exposure.

The parts marked "*" are used in voltage more than 250V.

REF. NO. PART NO. DESCRIPTION Q'TY CODE

Page 32

R-204(W)

Note: The parts marked "∆" may cause undue microwave exposure.

The parts marked "*" are used in voltage more than 250V.

REF. NO. PART NO. DESCRIPTION Q'TY CODE

7- 7 XHPSD40P08000 Screw : 4mm x 6mm 3 AA 7- 8 XOTSD40P12RV0 Screw : 4mm x 12mm 5 AA 7- 9 XOTSE40P08000 Screw : 4mm x 8mm 2 AA

HOW TO ORDER REPLACEMENT PARTS

To have your order filled prompty and correctly, please furnish the following information.

1. MODEL NUMBER

3. PART NO.

2. REF. NO.

4. DESCRIPTION

Page 33

R-204(W)

23456

123456

OVEN PARTS

7-8

2-1

7-8

6-3

4-11

4-3

7-3

7-5

2-2

4-7

4-10

4-2

6-1

6-2

7-3

7-2

7-3

7-9

7-1

4-5

7-3

7-6

7-3

7-2

7-1

SW1

SW2

SW3

TTM

1-3

4-1

7-2

2-2

4-6

4-9

2-3

4-8

4-4

7-1

1-1

1-2

7-7

7-4

4-9

Page 34

R-204(W)

23456

123456

5-2

6-4

5-5

5-3

5-4

5-6

5-7

5-1

Actual wire harness may be different than illustration.

3-9

3-1

3-8

3-2

3-3

3-5

3-6

3-7

3-4

CONTROL PANEL PARTS

DOOR PARTS

MISCELLANEOUS

Page 35

R-204(W)

PACKING AND ACCESSORIES

6-1 TURNTABLE TRAY

6-5 INSTRUCTION BOOK

6-2 TURNRTABLE SUPPORT

INTO THE OVEN CAVITY

Not replaceable items.

TRAY PAD ASSY

(CPADBA287WRKZ)

PACKING CASE

MICROWAVE OVEN

TOP PAD ASSEMBLY FPADBA459WRKZ

WRAP COVER SSAKHA014WRE0

SPAKCD635WREZ

BOTTOM PAD ASSEMBLY FPADBA460WRKZ

DOOR PROTECT SHEET SPADPA580WRE0

Page 36

R-204(W)

'01 SHARP CORP. (8S1.31E) Printed in Germany