Sharp R363 SM Schematic

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SERVICE MANUAL

MICROWAVE OVEN

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S06278R363EHW

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R-363(IN)

R-363(IN)

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

TABLE OF CONTENTS

Page

CAUTION ............................................................................................................................. INSIDE COVER

GENERAL IMPORTANT INFORMATION .................................................................................................. 1

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

CAUTION, MICROWAVE RADIATION, WARNING ................................................................................... 5

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

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

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

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

TEST PROCEDURES .............................................................................................................................. 10

TOUCH CONTROL ASSEMBLY .............................................................................................................. 19

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ..................................................... 23

TEST DATA AT A GLANCE ..................................................................................................................... 27

MICROWAVE MEASUREMENT .............................................................................................................. 28

WIRING DIAGRAMS ................................................................................................................................ 29

SWITCH UNIT CIRCUIT ............................................................................................................................32

PICTORIAL DIAGRAM .............................................................................................................................. 33

PRINTED WIRING BOARD OF SWITCH UNIT ........................................................................................34

PARTS LIST ............................................................................................................................................. 35

EXPLODED VIEW OF OVEN ....................................................................................................................38

CONTROL PANEL & DOOR PARTS ........................................................................................................39

MISCELLANEOUS/PACKING AND ACCESSORIES ............................................................................... 40

MODELS

SHARP CORPORATION

SERVICE MANUAL

MICROWAVE OVEN

R-363(IN)

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 in 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.

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.

All the parts marked ”*” on parts list are used at voltages more than 250V.

Removal of the outer wrap gives access to potentials 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.

Never operate the Grill with the oven outer cabinet removed. (Because air flow is eliminated, and the excess heat
generated on adjacent components). It can cause permanent damage or a fire.

SHARP CORPORATION
OSAKA, JAPAN

R-363 -

1

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 3D

1) Disconnect the supply.

2) Door opened, and wedged open.

3) Discharge high voltage capacitor.

WARNING AGAINST THE CHARGE OF THE HIGH­VOLTAGE 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
high-voltage capacitor (that is, of the connecting lead of
the high-voltage 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
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.

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.

3D checks

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 deprimaire zijde vande
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

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
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 carried out.

bovenstaande 3 stappen en verbindt u de electrische
draden weer aan de primaire zijde van de
vermogenstransformator.

3D checks and re-examine the connections to

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.

R-363 -

2

SERVICING

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

E

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 ALTO VOLTAJE

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.

R-363 -

3

SERVICING

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 IMPORTANTI 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.

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.

As part of our policy of continuous improvement, we reserve the
right to alter design and specifications without notice

R-363 -

IMPORTANT: If the oven becomes inoperative because of

a blown fuse F8A in the monitored latch
switch - monitor switch circuit, check the
monitored latch switch and monitor switch
before replacing the fuse F8A.

4

CAUTION/WARNING

CAUTION

MICROWAVE RADIATION

Service engineers 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.

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

All the parts marked "*" on parts list are used at
voltages more than 250V.

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

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

WARNING

WARNING

THIS APPLIANCE MUST BE EARTHED. THE WIRES IN THIS MAINS LEAD ARE COLOURED IN

ACCORDANCE WITH THE FOLLOWING CODE:
GREEN-AND-YELLOW : EARTH BLUE : NEUTRAL BROWN : LIVE

PRODUCT DESCRIPTION

SPECIFICATION

Power Requirements 230 Volts 50 Hertz Single phase, 3 wire earthed
Power Consumption 1.35 kW Approx. 6.0 A
Power Output 900W watts nominal of RF microwave energy

(measured by way of IEC 60705) Operating frequency of 2450 MHz

Case Dimensions Width 520mm

Height 305mm including foot
Depth 422mm

Cooking Cavity Dimensions Width 342mm

Height 207mm

Depth 368mm
Turntable diameter 325mm
Control Complement Jog Touch System

Clock (1:00-12:59 or 0:00-23:59)
Timer (0-99 minutes 90 seconds)

Control Complement 90 minutes

Microwave Power for Variable Cooking
Repetition Rate;

HIGH ............................. Full power throughout the cooking time

MEDIUM HIGH.............. approx. 70% of Full Power

MEDIUM........................ approx. 50% of Full Power

MEDIUM LOW .............. approx. 30% of Full Power

LOW .............................. approx. 10% of Full Power

EXPRESS COOK key
EXPRESS DEFROST key x 3

STOP key
POWER LEVEL key
MINUTE PLUS/START key

ROTARY KNOB

Set Weight Approx. 18.0 kg

R-363 -

5

APPEARANCE VIEW

OVEN

AUTO-TOUCH CONTROL PANEL

1. Door

2. Door hinges

3. Oven lamp

4. Waveguide cover

5. Contol panel

6. Coupling

7. Door latches

8. Oven cavity

9. Door seals and sealing surfaces

10. Safety door latches

11. Door handle

12. Ventilation openings

13. Outer case

14. Rear back plate

15. Power supply cord

1. Place the roller stay on the coupling.

2. Then place the turntable on it.

TURNTABLE

ROLLER STAY

COUPLING

COOK

DEFROST

1

2

1. Display Window

2. Symbols and Indicators

3. EXPRESS COOK

4. EXPRESS DEFROST

5. +1min/START button

3

6. STOP button

7. COOKING MODE button

4

8. TIMER/WEIGHT/POWER knob

5
6

7

8

R-363

R-363 -

5

6

OPERATING SEQUENCE

OFF CONDITION

Closing the door activates all door interlock switches
(monitored latch switch and stop switch).

IMPORTANT
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 line voltage is supplied to the point
A1+A3 in the control unit.

Figure O-1 on page 29

1. The display flashes "88:88”.

2. To set any programmes or set the clock, you must first
touch the STOP pad.

3. “:” appears in the display.

NOTE: When the oven door is opened, the oven lamp

comes on at this time.

MICROWAVE COOKING CONDITION

HIGH COOKING

Enter a desired cooking time with the ROTARY knob and
start the oven by touching START button.

Function sequence Figure O-2 on page 29

CONNECTED COMPONENTS RELAY

Oven lamp, Fan motor, Turntable motor RY1
Power transformer RY2

CONDITION

SWITCH CONTACT COOKING (NO COOKING)
Monitored latch switch COM-NO Closed Open
Monitor switch COM-NC Open Closed

COM-NO Closed Open

Stop switch COM-NO Closed Open

DURING DOOR OPEN

The circuits to the power transformer, fan motor and
turntable motor are cut off when the primary latch
switch and stop switch are made open.
The oven lamp remains on even if the oven door is
opened after the cooking cycle has been interrupted,
because the relay

RY1 stays closed. Shown in the

display is the remaining time.

6. MONITOR SWITCH CIRCUIT
The monitor switch

SW2 is mechanically controlled by
oven door, and monitors the operation of the
monitored latch switch

SW1

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

cycle of cooking program, the monitored latch and
stop switches
first. After that the contacts (
monitor switch

SW1 + SW3 must open their contacts

COM - NC) of the

SW2 can be closed.

6-2 When the oven door is closed, the contacts

(

COM - NC) of the monitor switch SW2 must be
opened. After that contacts of the monitored latch
and stop switches

SW1 + SW3 are closed.

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

the monitored latch switch

SW1 remain closed, the
fuse F8A will blow, because the monitor switch is
closed and a short circuit is caused.

1. The line voltage is supplied to the primary winding of
the power 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 single tone is heard
and the relays

RY1 + RY2 go back to their home
position. The circuits to the oven lamp, power
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.

MEDIUM HIGH, MEDIUM, MEDIUM LOW, LOW
COOKING

When the microwave oven is preset for variable cooking
power, the line voltage is supplied to the power
transformer intermittently within a 48-second time base
through the relay contact which is coupled with the
current-limiting relay
microwave power are given.

SETTING

HIGH

MEDIUM
HIGH

MEDIUM

MEDIUM
LOW

LOW

NOTE: The ON/OFF time ratio does not exactly

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

RY2. The following levels of

32 sec. ON

Approx100% = 900Watts

24 sec. ON

18 sec. ON

12 sec. ON

6 sec. ON

8 sec. OFF

Approx. 70% = 630Watts

14 sec. OFF

Approx. 50% = 450Watts

20 sec. OFF

Approx. 30% = 270Watts

26 sec. OFF

Approx. 10% = 90Watts

R-363 -

7

FUNCTION OF IMPORTANT COMPONENTS

FUSE F1 F8A 250V

DOOR OPEN MECHANISM

The door can be opened by puiiing the door handle. When
the door handle is pulled, the latch head is moved upward,
and released from the latch hook now the door can be
opened.

Latch Hooks

1. If the wire harness or electrical components are short-

2. The fuse also blows when monitored latch switch

3. The fuse blows when the asymmetric rectifier, H.V.

circuited, this fuse blows to prevent an electric shock or
fire hazard.

SW1
remains closed with the oven door open and when the
monitor switch

rectifier, H.V. wire harness, H.V. capacitor, magnetron
or secondary winding of power transformer is shorted.

SW2 closes.

Stop Switch
SW3

Monitor Switch
SW2

Monitored Latch
Switch SW1

Figure D-1. Door Open Mechanism

MONITORED LATCH SWITCH SW1
STOP SWITCH SW3

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

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

MONITOR SWITCH SW2

1. When the oven door is closed, the contacts (
must be opened and the contacts (
closed.

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

3. If the oven door is opened and the contacts (
of the monitored latch switch
F8A blows simultaneously with closing the contacts (

- NC) of the monitor switch SW2.

SW1 fail to open, the fuse F1

COM - NO) must be

COM - NO)

COM - NC)

COM - NC)

COM - NO)

COM

THERMAL CUT-OUT 125

The thermal cut-out protects the magnetron against
overheat. If this temperature goes up higher than 125°C
because the fan motor is interrupted or the ventilation
openings are blocked, the thermal cut-out
and line voltages to the power transformer
and the operation of the magnetron MG will be stopped. The
defective thermal cut-out
one.

THERMAL CUT-OUT 125

The thermal cut-out located on the top of the oven cavity is
designed to prevent damage to the oven if the food in the
oven catches fire due to over heating caused by improper
setting of cook time or failure of control unit. Under normal
operation, the oven thermal cut-out remains closed. How­ever, when abnormally high temperatures are reached
within the oven cavity, the oven thermal cut-out will open at
125°C, causing the oven to shut down. The defective
thermal cut-out

TURNTABLE MOTOR

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

FAN MOTOR

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

NOISE FILTER

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

TC2 must be replaced with new one.

°C TC1 (MG)

TC1 will open

T will be cut off

TC1 must be replaced with new

°C TC2 (OVEN)

CAUTION: BEFORE REPLACING A BLOWN FUSE F1 F8A,

TEST THE MONITORED LATCH SWITCH SW1
AND MONITOR SWITCH SW2 FOR PROPER
OPERATION. (REFER TO CHAPTER ”TEST
PROCEDURE”.)

R-363 -

8

FUNCTION OF IMPORTANT COMPONENTS

ASYMMETRIC RECTIFIER

The asymmetric rectifier is a solid state device that prevents
current flow in both directions. It prevents the temperature
rise of the power transformer by blowing the special fuse

F1

when the high voltage rectifier is shorted.

D2

ASYMMETRIC
RECTIFIER

D1

HIGH VOLTAGE RECTIFIER

The rated peak reverse voltage of D1 of the asymmetric
rectifier is 6 KV. The rated peak reverse voltage of D2 of the
asymmetric rectifier is 1.7 KV. D1 and D2 of the asymmetric
rectifier or high voltage rectifier are shorted when the each
peak reverse voltage goes beyond the each rated peak
reverse voltage.
(The process of blowing the fuse

F1)

1. The high voltage rectifier is shorted by any causes when
microwave cooking.

2. The peak reverse voltage of D2 of the rectifier goes
beyond the rated peak reverse voltage 1.7 KV in the
voltage doubler circuit.

3. D2 of the rectifier is shorted.

4. The large electric currents flow through the high voltage
winding of the power transformer.

5. The large electric currents beyond 10A flow through the
primary winding of the power transformer.

6. The fuse

F1 blows by the large electric currents.

7. The power supply to the power transformer is cut off.

R-363 -

9

TEST PROCEDURES

CONDITION

OFF
CONDITION

TEST PROCEDURE

POSSIBLE CAUSE

AND

DEFECTIVE PARTS

PROBLEM

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

Fuse F8A blows when the door is opened.
Special fuse blows when power supply cord is

plugged into wall outlet.
“88:88” does not appear in display when power

cord is plugged into wall outlet.
Display does not operate properly when STOP

pad is touched.
Oven lamp does not light when door is opened.

(Display appears.)
Oven does not start when START pad is touched.

(Display appears.)

ABCDEEEF GHI

F

N

S

T

S

M

P

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L
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COOKING
CONDITION

Oven lamp does not light. (Display appears.)

Fan motor does not operate. (Display appears.)
Turntable motor assembly does not operate.

(Display appears.)
Oven or any electrical parts do not stop when

cooking time is 0 or STOP pad is touched.
Oven seems to be operating but little or no heat is

produced in oven load. (Microwave power level is
set at ”HIGH”)

Oven does not operate properly during the variable
cooking condition except ”HIGH” cooking condition.
(Oven stops when STOP pad is touched.)

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

Oven stops as soon as the START pad is touched.

R-363 -

10

TEST PROCEDURES

I J K M N

S

T

T

U

O

R

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T

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A
B

C
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R-363 -

11

TEST PROCEDURES

PROCEDURE

LETTER COMPONENT TEST

A MAGNETRON TEST

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

CARRY OUT

Isolate the magnetron from high voltage circuit by removing all leads connected to 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 short 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 (IEC-60705-1988)

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 way of
IEC 60705, 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(g) rises ∆T (°C) during this microwave heating period, the
calorie of the water is V x ∆T.

The formula is as follows;

Our condition for water load is as follows:

3D CHECK

P x t / 4.187 = V x ∆ T P (W) = 4.187 x V x ∆T / t

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

Water load.........1000 g Initial temperature...........10 ± 2°C Heating time ...47+3=50 sec.

P = 90 x ∆T

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 5K.

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 ± 2) K.

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

R-363 -

12

TEST PROCEDURES

PROCEDURE

LETTER COMPONENT TEST

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.

Initial temperature ......................................................................................................... T1 = 11°C

Temperature after (47 + 3) = 50 sec. ............................................................................ T2 = 21°C

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

Measured output power

The equation is “P = 90 x ∆T” ................................................. P = 90 x 10°C = 900 Watts Approx.

JUDGMENT: The measured output power should be at least

CAUTION: 1°C CORRESPONDS TO 90 WATTS. REPEAT MEASUREMENT IF THE POWER IS

INSUFFICIENT.

1000g

1000g

T1˚C

B POWER TRANSFORMER TEST

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

filament winding of the power 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

± 15 % of the rated output power.

1000g

T2˚C

Heat up for 50 sec.

Disconnect the leads to the primary winding of the power 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 windings. The following readings should be obtained:-

a. Primary winding ............2 ohms approximately

b. Secondary winding ....... 130 ohms approximately

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

If the reading obtained are not stated above, then the power transformer is probably faulty and should
be replaced.

CARRY OUT

4R CHECKS

C HIGH VOLTAGE RECTIFIER ASSEMBLY 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 B + C 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

R-363 -

13

TEST PROCEDURES

AB

C

D2 D1

ASYMMETRIC
RECTIFIER

HIGH VOLTAGE RECTIFIER

PROCEDURE

LETTER COMPONENT TEST

ASYMMETRIC RECTIFIER TEST

CARRY OUT 3D CHECKS.

Isolate the high voltage rectifier assembly from the HV circuit. The asymmetric rectifier can be tested
using an ohmmeter set to its highest range. Connect the ohmmeter across the terminals A + B of the
asymmetric rectifier and note the reading obtained. Reverse the meter leads and note this second
reading. If an open circuit is indicated in both directions then the asymmetric rectifier is good. If an
asymmetric rectifier is shorted in either direction, then the asymmetric rectifier is faulty and must be
replaced with the high voltage rectifier. When the asymmetric rectifier is defective, check whether
magnetron, high voltage rectifier, high voltage wire or filament winding of the power transformer is
shorted.

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.

D HIGH VOLTAGE CAPACITOR TEST

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.

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

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 readings are obtained, the high voltage capacitor must be replaced.

CARRY OUT

4R CHECKS

E SWITCH TEST

CARRY OUT

Isolate the switch to be tested and using an ohmmeter check between the terminals as described in the
following table.

Plunger Operation COM to NO COM to NC

Released Open circuit Short circuit

Depressed Short circuit Open Circuit

If incorrect readings are obtained, make the necessary switch adjustment or replace the switch.

CARRY OUT

3D CHECKS

Table: Terminal Connection of Switch

4R CHECKS.

R-363 -

14

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

TEST PROCEDURES

PROCEDURE

LETTER COMPONENT TEST

F THERMAL CUT OUT TEST

CARRY OUT

3D CHECKS

Disconnect the leads from the terminals of the thermal cut-out. Then using an ohmmeter, make a
continuity test across the two terminals as described below.

CARRY OUT

Temperature of ”ON” condition (closed circuit) ................................................................................. This is not resetable type

Temperature of ”OFF” condition (open circuit) ..................................................................................................... Above 125°C

Indication of ohmmeter (When room temperature is approx. 20°C.) ................................................................... Closed circuit

4R CHECKS

If incorrect readings are obtained , replace the thermal cut-out.

An open circuit thermal cut-out (MG) indicates that the magnetron has overheated, this may be due to
restricted ventilation, cooling fan failure or a fault condition within the magnetron or HV circuit.

An open circuit thermal cut-out (OVEN) indicates that the foods in the oven may have caught fire, this
may be due to over heating produced by improper setting of the cooking timer or failure of the control
panel.

G BLOWN SPECIAL FUSE F8A

CARRY OUT 3D CHECKS

1. If the special fuse

F1 is blown, there could be shorts or grounds in electrical parts or wire harness.

Check them and replace the defective parts or repair the wire harness.

2. If the special fuse

F1 is blown, there could be a short in the asymmetric rectifier or there is a ground
in wire harness. A short in the asymmetric rectifier may have occurred due to short or ground in H.V.
rectifier, magnetron, power transformer or H.V. wire. Check them and replace the defective parts or
repair the wire harness.

3. If the fuse

F1 8A is blown when the door is opened, check the primary latch switch, monitor switch
and monitor resistor.
If the fuse

F1 8A is blown by incorrect door switching replace the defective switch(s) and the fuse

F1 8A.

CARRY OUT

4R CHECKS

CAUTION: Only replace special fuse

H NOISE FILTER TEST

CARRY OUT

3D CHECKS

Disconnect the leads from the terminals of
the noise filter.
Using an ohmmeter, check between the ter­minals as described in the following table.

MEASURING POINTS INDICATION OF OHMMETER

Between N and L >100MΩ ohm
Between terminal N and WHITE Short circuit
Between terminal L and RED Short circuit

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

CARRY OUT

4R CHECKS

F1 with the correct value replacement

N

F8A

L

Cx

L

R2

L

L(min) Cx ± 20% Cy ± 20%
1mH 0.22µF 0.0033µF

R1

Cy

WHT

R1 = 10MΩ ± 5%
R2 = 680KΩ ± 5%

RED

R-363 -

15

TEST PROCEDURES

PROCEDURE

LETTER

I MOTOR WINDING TEST

CARRY OUT

Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the two
terminals as described in the table below.

If incorrect readings are obtained, replace the motor.

CARRY OUT

J TOUCH CONTROL PANEL ASSEMBLY TEST

CAUTION shock. Because the control unit is " TRANSLESS CIRCUIT " and all electrical parts

3D CHECKS

Motors Resistance
Fan motor Approximately 290Ω
Turntable motor Approximately 14.6kΩ

4R CHECKS

Do not touch the electrical parts and the printed wiring board to prevent an electric

are used at A.C. line voltage.

COMPONENT TEST

Table: Resistance of Motor

The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore,
unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter and
ohmmeter.
In this service manual, the touch control panel assembly is divided into two units, Control Unit and Switch
Unit, and troubleshooting by unit replacement is described according to the symptoms indicated.

1. Switch Unit. Note : Check switch unit lead wire harness connection before replacement.
The following symptoms indicate a defective switch unit. Replace the switch unit.
a) When touching the keys, a certain key produces no signal at all.
b) When touching a key, two figures or more are displayed.
c) When touching the keys, sometimes a key produces no signal.

2. Control Unit
The following symptoms indicate a defective control unit. Before replacing the control unit
perform the Switch unit test (Procedure I) to determine if control unit is faulty.

2-1 In connection with keys.

a) When touching the keys, a certain group of keys do not produce a signal.
b) When touching the keys, no keys produce a signal.

2-2 In connection with indicators

a) At a certain digit, all or some dots do not light up.
b) At a certain digit, brightness is low.
c) Only one indicator does not light.
d) The corresponding dots of all digits do not light up; or they continue to light up.
e) Wrong figure appears.
f) A certain group of indicators do not light up.
g) The figure of all digits flicker.

2-3 Other possible problems caused by defective control unit.

a) Buzzer does not sound or continues to sound.
b) Clock does not operate properly.
c) Cooking is not possible.

R-363 -

16

TEST PROCEDURES

PROCEDURE

LETTER

K SWITCH UNIT TEST

If the display fails to clear when the STOP key is de­pressed, first verify the lead wire harness is making good
contact, verify that the door sensing switch (stop switch)
operates properly; that is the contacts are closed when the
door is closed and open when the door is open. If the door
sensing switch (stop switch) is good, disconnect the lead
wire harness that connects the switch unit to the display
unit and make sure the door sensing switch is closed
(either close the door or short the door sensing switch
connector). Use the Switch unit matrix indicated on the
switch unit circuit and place a jumper wire between the pins
that correspond to the STOP key making momentary
contact. If the display unit responds by clearing with a beep
the switch unit is faulty and must be replaced. If the display
unit does not respond, it is a faulty and must be replaced.
If a specific key does not respond, the above method may
be used (after clearing the display unit) to determine if the
display unit or switch unit is at fault.

COMPONENT TEST

CN - C

1

SW1

2

SW2

3

SW3

4

SW4

5

SW5

SW6

SW7

6

L TACT SWITCH TEST

1. Disconnect the oven from the power supply.

2. Discharge the high voltage capacitor.

3. Remove the control unit from the control panel.

4. By using an ohmmeter, check the tact switch operation.

5. When the tact switch is not depressed, an ohmmeter should indicate an open circuit. When the tact
switch is depressed, an ohmmeter should indicate a short circuit. If improper operation is indicated,
the tact switch is probably defective and should be checked.

M RELAY TEST

Remove the outer case and check voltage between Pin No 5 of the 3 pin connector (A) and common
terminal of the relay (RY2) on the control unit with an A.C. voltmeter.
The meter should indicate rated voltage, if not check oven circuit.

RY1 and RY2 Relay Test
These relays are operated by D.C. voltage
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,

RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS

RY1 Approx. 18.0V D.C. Oven lamp / Turntable motor / Cooling fan motor
RY2 Approx. 7.0V D.C. High voltage transformer

control unit is defective.

R-363 -

17

TEST PROCEDURES

PROCEDURE

LETTER

N 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.

STEPS OCCURRENCE CAUSE OR CORRECTION

1 The rated voltage is not applied between Pin Check supply voltage and oven power cord.

No. 5 of the 3 pin connector (A) and the
common terminal of the relay RY2.

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

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

NOTE: *At the time of making these repairs,

make a visual inspection of the varistor.
Check for burned damage. If any ab­normal condition is detected, replace
the defective parts.

COMPONENT TEST

R70

RY2

RY1

ZD70

D71

c

(J1)

R1

b

a

d

VRS1

51

R-363 -

18

TOUCH CONTROL PANEL ASSEMBLY

OUTLINE OF TOUCH CONTROL PANEL

The touch control section consists of the following units.

(1) Switch Unit
(2) Control Unit

The principal functions of these units and the signals commu­nicated among them are explained below.

Switch Unit

The switch unit is composed of a matrix, signals generated in
the LSI are sent to the switch unit through R60, R61, R62 and
R63.
When a switch button is touched, a signal is completed
through the switch unit and passed back to the LSI through
R81 and R83 to perform the function that was requested.

Control Unit

Control unit consists of LSI, ACL circuit, indicator circuit,
power source circuit, relay circuit, buzzer circuit, synchroniz­ing signal circuit and back light circuit.

1) ACL

This circuit generates a signal which resets the LSI to the
initial state when power is supplied.

2) Indicator Circuit

This circuit consists of 4-digits, 12-segments and 3­common electrodes using a Liquid Crystal Display.

4) Relay Circuit

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

5) Buzzer Circuit

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

6) 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.

7) Door Sensing Switch (Stop Switch)

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

8) Encoder

The encoder converts the signal generated by LSI into
the pulse signal, and the pulse signal is returned to the
LSI.

9) Back Light Circuit

A circuit to drive the back light (Light emitting diodes
LED1-LED3)

3) Power Source Circuit

This circuit generates voltage necessary in the control
unit from the AC line voltage.

Symbol Voltage Application

VC +5V LSI(IC1)

R-363 -

19

DESCRIPTION OF LSI

LSI(IXA027DR)

The I/O signal of the LSI(IXA027DR) are detailed in the following table.

Pin No. Signal I/O Description

1-12 SEG0 - OUT Segment data signal.

SEG11 Connected to LCD.

The relation between signals are as follows:

LSI signal (Pin No.) LCD (Pin No.) LSI signal (Pin No.) LCD (Pin No.)

SEG 0 (1) ................................... S6 SEG 6 (7) ..............................S12

SEG 1 (2) ................................... S7 SEG 7 (8) ................................S5

SEG 2 (3) ................................... S8 SEG 8 (9) ................................S4

SEG 3 (4) ................................... S9 SEG 9 (10) ..............................S3

SEG 4 (5) ................................. S10 SEG 10 (11) ............................S2

SEG 5 (6) ................................. S11 SEG 11 (12) ............................S1

13 R60 OUT Tact switch strobe signal.

Signal applied to tact switch section. A pulse signal is input to R83 terminal while the
tact switch SW1 is touched.

14 R61 OUT

15 R62 OUT

16 R63 OUT

17 AIN0 IN

18-20 AIN1-AIN3 IN

21 VSS IN

22 R70 OUT

23 R71 OUT

Tact switch strobe signal.

Signal applied to tact switch section. A pulse signal is input to R81or R83 terminal
while the tact switch SW2 or SW5 is touched.

Tact switch strobe signal.

Signal applied to tact switch section. A pulse signal is input to R81 or R83 terminal
while the tact switch SW3 or SW6 is touched.

Tact switch strobe signal.

Signal applied to tact switch section. A pulse signal is input to R81 or R83 terminal
while the tact switch SW4 or SW7 is touched.

To input signal which communicates the door open/close information to LSI.

Door close "L" level signal (0V). Door open "H" level (+5V)

Terminal to change functions according to the Model.

By using the A/D converter contained in the LSI, DC voltage in accordance with the
Model in operation is applied to set up its function.

Power source voltage: 0V.

VSS voltage of power source circuit input.

Magnetron high-voltage circuit driving signal.

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

Signal to sound buzzer (2.0 kHz).

A: Tact switch touch sound.
B: Completion sound.

OFF

HIGH

OFF OFF

MEDIUM
HIGH

0.1 sec.

A

2 sec.

B

ON

ON

24 sec.

8 sec.

H : +5V

L : 0V
H : +5V

L : 0V

H : +5V

L: 0V

H : +5V

L: 0V

24 R72 OUT Oven lamp, fan motor and turntable motor driving signal.

To turn on and off shut off relay (RY1). The

20.0 msec

square waveform voltage is delivered to the
RY1 driving circuit.

During cooking

25 R73 IN Signal coming from encoder.

When the encoder is turned, the contacts of encoder make pulse signals. And pulse
signals are input into R73.

R-363 -

20

H : +5V

L : 0V

DESCRIPTION OF LSI

Pin No. Signal I/O Description

26 INT2 IN Signal synchronized with commercial power source frequency.

This is the basic timing for time processing of LSI.

20.0 msec

27 R81 IN Signal coming from tact switch.

When either of tact switches SW5-SW6 is touched, a corresponding signal out of
R60, R61, R62 and R63 will be input into R81. When no tact switch is touched, the
signal is held at "H" level.

28 INT1 IN

29 R83 IN

30-32 R90-R92 OUT Terminal not used.
33 XIN IN

34 XOUT OUT

35 RESET IN

36 HOLD IN/OUT Connected to VDD.
37 VLC IN

38 COM1 OUT

39 COM2 OUT

40 COM3 OUT

41 COM4 OUT Terminal not used.
42 VDD IN

Signal coming from encoder.

Signal similar to R73. Pulse signals are input into INT1.

Signal coming from tact switch.

When either of tact switches SW1-SW4 is touched, a corresponding signal out of
R60, R61, R62 and R63 will be input into R83. When no tact switch is touched, the
signal is held at "H" level.

Internal clock oscillation frequency setting input.

The internal clock frequency is set by inserting the capacitor and resistor circuit with
respect to XOUT terminal.

Internal clock oscillation frequency control output.

Output to control oscillation input of XIN.

Auto clear terminal.

Signal is input to reset the LSI to the initial state when power is supplied. Temporarily
set "L" level the moment power is supplied, at this time the LSI is reset. Thereafter
set at "H" level.

Signal synchronized with commercial power source frequency.
Signal similar to VSS.

Common data signal.

Connected to LCD(C1).

Common data signal.

Connected to LCD(C2).

Common data signal.

Connected to LCD (C3).

Power source voltage input terminal.

Connected to VC.

H : +5V

L : 0V

R-363 -

21

TOUCH CONTROL

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.

approx. 1M ohm

2. Shapes of Electronic Components

Transistor
2SA1267Y
KRA101M
KRC101M

B

C

E

KRC105M

3. 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 between

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 between

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. 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).

4. 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

5. 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.

R-363 -

22

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

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

operating the oven.

1. CARRY OUT

2. Make sure that a definite "click" can be heard when the
microwave oven door is unlatched. (Pull the microwave
oven door open slowly, 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:

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

3D CHECKS.

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.

OUTER CASE REMOVAL

To remove the outer case, proceed as follows.

1. Disconnect oven from power supply.

2. Open the oven door and wedge it open.

3. Remove the screws from rear and along the side edge
of case.

4. Slide the entire case back about 3cm to free it from
retaining clips on the cavity face plate.

5. Lift the entire case from the oven.

6. Discharge the H.V. capacitor before carrying out
any further work.

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

N.B.; Step 1, 2 and 6 form the basis of the

CAUTION: DISCHARGE HIGH VOLTAGE CAPACITOR

BEFORE TOUCHING ANY OVEN
COMPONENTS OR WIRING.

3D checks.

HIGH VOLTAGE COMPONENTS REMOVAL
(HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY)

To remove the components, proceed as follows.

1. CARRY OUT

2. Disconnect all the leads and terminals of high voltage
rectifier assembly from high voltage capacitor.

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

4. Remove one (1) screw holding capacitor holder to the
oven cavity.

5. Release the capacitor holder from the duct.

3D CHECKS

6. Remove the capacitor from the capacitor holder.

7. Now high voltage rectifier assembly and capacitor
should be free.

CAUTION: WHEN REPLACING HIGH VOLTAGE

RECTIFIER ASSEMBLY, ENSURE THAT THE
CATHODE (EARTH) CONNECTION IS
SECURELY FIXED TO THE CAPACITOR
HOLDER WITH AN EARTHING SCREW.

POWER TRANSFORMER REMOVAL

1. CARRY OUT 3D CHECKS

2. Disconnect the filament leads and secondary wire of the
power transformer from high voltage capacitor and the
magnetron.

3. Disconnect the main wire harness from the power
transformer.

MAGNETRON REMOVAL

1. CARRY OUT 3D CHECKS.

2. Remove the air separate duct from the chassis support
and the air intake duct.

3. Disconnect the H.V. wire B and filament lead of the
transformer from the magnetron.

4. Remove the one (1) screw holding the chassis support
to the magnetron.

5. Move the air intake duct to left.

6. Remove the air deflector from the magnetron.

.

4. Remove the two (2) screws and one (1) washer holding
the transformer to base plate.

5. Remove the transformer.

6. Now, the power transformer is free.

7. Carefully remove four (4) screws holding magnetron to
waveguide, when removing the screws hold the
magnetron to prevent it from falling.

8. Remove the magnetron from the waveguide with care
so that the magnetron antenna is not hit by any metal
object around the antenna.

CAUTION: WHEN REPLACING THE MAGNETRON,

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

R-363 -

23

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

FAN MOTOR REMOVAL

1. CARRY OUT 3D CHECKS

2. Remove the one (1) screw holding the noise filter to the
chassis support.

3. Release the noise filter from the tabs of the fan duct.

4. Disconnect the wire leads from the fan motor.

5. Remove the one (1) screw holding the capacitor holder
to the oven cavity back plate.

6. Remove the one (1) screw holding the fan duct to the
oven cavity back plate.

CONTROL PANEL REMOVAL

1. CARRY OUT

2. Disconnect the main harness and stop switch harness
from the control panel.

3D CHECKS

TURNTABLE MOTOR REMOVAL

1. Disconnect the oven from power supply.

2. Remove the turntable motor cover by snipping of material
in four corners.

3. Where the corners have been snipped off bend corner
areas flat. No sharp edge must be evident after removal
of TT motor cover.

7. Release the tabs of the capacitor holder from the fan
duct.

8. Remove the fan duct from the oven.

9. Remove the fan blade assembly from the fan motor.

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

11.Now, the fan motor is free.

3. Lift up the control panel assembly and pull it forward.
Now, the control panel assembly is free.

4. Disconnect the wire lead from turntable motor and
remove the 2 screws holding the turntable motor.

5. Turntable is now free.

6. After replacement use the one (1) screw provided with
the turntable motor assembly to fit the turntable motor
cover.

TURNTABLE COUPLING REMOVAL

1. Remove the turntable motor, refer to “Turntable Motor
Removal”.

2. Pull the coupling out of the hole in the oven cavity.

3. At that time the turntable coupling will be free.

CAUTION: REPLACE THE PACKING AT THE SAME

TIME WHEN REPLACING THE
COUPLING. BECAUSE THE PACKING
MAY BE DAMAGED WHEN PULLING OUT
THE COUPLING.

OVEN LAMP REMOVAL

1. CARRY OUT 3D CHECKS

2. To remove the wire from the lamp holder press down the
terminal tab and pull.

3. Lift up the oven lamp socket.

4. Now, the oven lamp socket is free.

PACKING

Figure C-1. Turntable Coupling

Lock

Socket

Figure C-2. Oven lamp

COUPLING

T.T.M
SUPPORT
ANGLE

Bulb

R-363 -

24

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

Latch Hooks

Stop Switch
SW3

Monitor Switch
SW2

Monitored Latch
Switch SW1

PRIMARY LATCH SWITCH, STOP SWITCH AND MONITOR SWITCH REMOVAL

1. CARRY OUT 3D CHECKS.

2. Remove the control panel assembly referring to
“CONTROL PANEL REMOVAL”.

3. Disconnect the leads from all switches.

4. Remove the two (2) screws holding the latch hook to the
oven cavity.

5. Remove the latch hook.

6. Push the retaining tab slightly and remove the switch.

Figure C-3. Switches

MONITORED LATCH SWITCH, STOP SWITCH AND MONITOR SWITCH ADJUSTMENT

Stop switch
SW3

Monitor switch
SW2

Monitored latch
switch SW1

If the monitored latch switch, stop switch and monitor switch
do not operate properly due to a mis-adjustment, the
following adjustment should be made.

1. CARRY OUT

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

3. With door closed, adjust the latch hook by moving it back
and forward, or up and down. In and out play of the door
allowed by the latch hook should be less than 0.5 mm.
The horizontal position of the latch hook should be
placed where the monitor switch has activated with the
door closed. The vertical position of the latch hook
should be placed where the monitored latch switch and
stop switch have activated with the door closed.

4. Secure the screws with washers firmly.

5. Make sure of the monitored latch switch, stop switch and
monitor switch operation. If those switches have not
activated with the door closed, repeat steps 1-4.

After adjustment, make sure of following:

1. In and out play of door remains less than 0.5 mm when

2. The contacts (COM - NO) of monitored latch switch and

latched position. First check latch hook position, pushing
and pulling the door toward the oven face. The results
(play of the door) should be less than 0.5 mm.

stop switch interrupt the circuit before the door can be
opened.

3D CHECKS

3. The contacts (COM - NC) of the monitor switch close
when the door is opened.

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

R-363 -

Figure C-4Latch Switches Adjustment

25

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

DOOR REPLACEMENT

REMOVAL

1. CARRY OUT 3D CHECKS.

2. Pull door handle to open door.

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

4. Release choke cover from door panel.

5. Now choke cover is free.

Figure C-5. Door Disassembly

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

7. Now, door sub assembly is free from oven cavity.

8. Remove the four (4) screws holding the door panel to
the door frame.

9. Now, door panel is free.

10. Slide latch head upward and remove it from door frame,
releasing latch spring from door frame and latch head.

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

12.Remove the two (2) screws holding the door handle to
the door frame.

13.Remove the door handle from the door frame.

14.Slide the front door glass rightwards to release the tabs
holding it.

15.Now, the front door glass is free

RE-INSTALL

Re-install the front door glass to the door frame as
follows.

1) Insert the left hand side edge of the front door glass into
the right hand side of the door frame.

2) Slide the front door glass leftwards into the door frame.

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

4. Re-install door panel to door frame.

5. Fit the door panel to the door frame with four (4)
screws.

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

7. Re-install choke cover to door panel.

Note: After any service to the door;

Make sure that door sensing switch and monitored
latch switch are operating properly.

Figure C-6. Door Replacement

Re-install the door handle to the door frame as
follows.

1) Re-install the door handle to the door frame so that the
two (2) holes of the glass stopper meet the two (2) pins
of the door frame.

2) Hold the door handler to the door frame with the two (2)
screws.

R-363 -

26

TEST DATA AT A GLANCE

Parts Symbol Value / Data
Fuse F1 F8A / 250V

Thermal cut-out (MG) TC1 125°C
Thermal cut-out (OVEN) TC2 125°C
Oven lamp OL 240-250 V 25W
High voltage capacitor C 1.0µF AC 2100V
Magnetron MG Filament < 1Ω

Filament – chassis ∞ ohm.

Power transformer T Filament winding < 1Ω

Secondary winding Approx. 130Ω
Primary winding Approx. 2 Ω

TEST POINT ON CONTROL UNIT

Resistance (Disconnect the

In/Out put terminal Test Point power plug and close the door.)
Input terminal (Power supply) RY.COM. - A5 ∞
Input terminal (Stop switch) B1–B2 0.2 ohm.
Output terminal (Oven lamp, A1–A5 Approx. 197Ω

Fan motor, Turntable motor)
Output terminal (Power transformer) NO. of RY2–A5 Approx. 2.5Ω

WARNING: DISCONNECT THE PLUG WHEN MEASURING RESISTANCE

WIRING / RE-WIRING

WARNING: Before carrying out any work carry out 3D checks

1) Disconnect the supply.

2) Door opened, and wedged open.

3) Discharge high voltage capacitor.

RE-WIRING

Ensure the following:

1. Wires must not touch:
a) High voltage parts.

(Magnetron, high voltage transformer, high voltage capacitor and high voltage rectifier assembly)

b) Parts that become hot.

(Heating elements, oven lamp, oven cavity magnetron and high voltage transformer)

c) Sharp edges.

(Bottom plates, oven cavity, waveguide flange, chassis support and other metallic parts)

d) Movable parts.

(Fan blade, any motor, switch, switch lever and open button)

2. Positive lock connectors are fitted correctly. Ensure the locking pin is located correctly.

3. Wires are connected correctly as per pictorial diagram.

4. No wire leads are trapped by the outer wrap.

R-363 -

27

MICROWAVE MEASUREMENT

After adjustment of door latch switches, 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 center 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

mW cm

SHARP

2

2

Microwave leakage measurement at 5 cm distance

R-363 -

28

R-363 -

29

NOISE
FILTER
UNIT

N

EARTH

NOISE SUPPRESSION COIL

BLU / 17

BRN / 17

G-Y / 17

O. 22 F / 250V

680K / 0.5W

0.0033 F / 250V

MAGNETRON

Figure O-2. Oven Schematic-ON Condition

THERMAL
CUT-OUT
125ßC

SW1:
MONIT’D
LATCH
SWITCH

SW2:
MONITOR
SWITCH

A5

no

no

SW3:
DOOR

STOP

SWITCH

com

no

no

03

B1
B2

072

OVEN
LIGHT

TURNTABLE
MOTOR

0.0033 F/ 250V

070

RY1

A1

OL

TTM

230V ~ 50HZ

F1:
FUSE
F8A

10M / 0.5W

A3

071

01

COM

RY2

NO

FM

FAN MMOTOR

POWER
TRANSFORMER

L

OVEN
THERMAL
CUT-OUT
125ßC

*

NOTE: * Components with

potentials above 250V.

NOISE
FILTER
UNIT

MAGNETRON

Figure O-1. Oven Schematic-OFF Condition

THERMAL
CUT-OUT
125ßC

SW1:
MONIT’D
LATCH
SWITCH

SW2:
MONITOR
SWITCH

no

N

EARTH

NOISE SUPPRESSION COIL

0.0033 F / 250V

A5

no

no

SW3:
DOOR

STOP

SWITCH

TURNTABLE
MOTOR

com

no

BLU / 17

O. 22 F / 250V

680K / 0.5W

070

03

B1

B2

072

OVEN
LIGHT

230V ~ 50HZ

BRN / 17

G-Y / 17

0.0033 F / 250V

071

01

RY1

A1

OL

TTM

F1:
FUSE
F8A

10M / 0.5W

A3

COM

RY2

NO

FM

FAN MMOTOR

POWER
TRANSFORMER

L

OVEN
THERMAL
CUT-OUT
125ßC

WIRING DIAGRAMS

*

ASYMMETRIC
RECTIFIER

H.V. RECTIFIER

*

CAPACITOR

1.0 F

*

2100VAC

*

MAGNETRON

ASYMMETRIC
RECTIFIER

*

*

H.V. RECTIFIER

CAPACITOR

1.0 F

*

2100VAC

*

MAGNETRON

*

R-363 -

30

TOUCH CONTROL PANEL

CN-B

CN-A

RLY 2

COM

NO

B

B

L

L

K

K

SW2: MONITOR
SWITCH

SW1: MONITORED
LATCH SWITCH

BLK

YLW

SW3:
STOP SWITCH

R
E
D

WHT

RED

RED

YLW

BLK

R
E
D

WHT

1

2

1
2
3
4

5

BLK

BLK

WHT

RED

WHT

TC2:
OVEN
THERMAL
CUT-OUT

R

B

E

L

D

K

TC1:
MAGNETRON
THERMAL CUT-OUT

W

B

H

L

T

K

TTM:
TURNTABLE MOTOR

RED

RED

WHT

NOISE
FILTER
UNIT

OL: OVEN LAMP

YLW

WHT

RED

WIRING DIAGRAMS

NEUTRAL

BLU

LIVE

N

L

W

R

H

E

T

D

RED

RED

RED

BRN

EARTH

G/Y

MG: MAGNETRON

T:
POWER
TRANSFORMER

Y
L
W

SHORT
PROTECTOR

C: HV CAPACITOR

POWER
SUPPLY
CORD

RED

FM:
FAN
MOTOR

Figure S-1. Pictorial Diagram

LIQUID CRYSTAL DISPLAY

WIRING DIAGRAMS

R-363 -

31

CN - A

OVEN LAMP
FAN MOTOR
TURNTABLE
MOTOR

FM

AC(N)

FM

AC(L)

HIGH
VOLTAGE
TRANSFORMER

A 1

A 5

A 3

COM

NO

ab

c

D3
1N4005E

D70

D70-71
1N4005E

RY2

d

RY1

D71

D1

1N4005E

VRS1

D73

R1

R2 R3 R4

R1-5
1k x 5 2w

+

10G471K

—

D20

R70 360 1w

R71 360 1w

ZD70-71
HZ7C2

NOTE :

C1 220 /16v

+

—

C40 0.1 /50v

D74

ZD71 ZD70

R5

D2

ZD1 HZ12C1

C20 220 /35v

ZD21 ZD20

+—+

—

C70 47 /35v

B 1 B 2

DOOR SWITCH

: IF NOT SPECIFIED 1/4W – 5%
: IF NOT SPECIFIED 1SS270A
: IF NOT SPECIFIED 0.01 F/16V

R10 27k R11 27k

1N4005E

R40

LED1-3

LED1 LED2 LED3

SLP-7117E

+

—

1.5k
1/2w

R30 3.3k

C21 100 /35v

Q20

ZD20-21 HZ12C1

KRA
101M

Q21
KRC
105M

R73 15k

C71 100 /35v

SP30

Q30
KRC
101M

+

—

C22 0.1 /50v

Q70
KRC105M

D72

D80

CN - B

CN-C

5

CN-C

6

4

CN-C

3

CN-C

2

(JSW2)

(J2)(J3)

(J4)(J5)

AIN3

AIN2

2019181716151413121110

(J6)(J7)

R12

D10

10k

C10

0.1

CN - C

CN-C1CN-C

/50v

R64 100k

22 21

R70 VSS

R71 23

R72 24

C41 47 /16v

R20

R41 1k

Q40 2SA1267Y

ZD40 HZ4C3

8.2k

C42 0.1 /50v

C43

R42 15k

JW1

+

—

R31 15k

C80

R81

R72

8.2k

4.7k

R80

15k

R63

R62

AIN1

AIN0

IC1
IXA027DR

R73 25

R81 27

INT2 26

INT1 28

S1S2S3S4S5

R61

R60

SEG11

R83 29

R90 30

R91 31

RW 100k

S12

SEG9

SEG8

SEG7

SEG6

SEG10

987654321

XIN 33

R92 32

XOUT 34

HOLD 36

RESET 35

R50 10kF

C50

33pF(CH)

C60

C61

R62 4.7k

R63 4.7k

S11

SEG5

VLC 37

S10

SEG4

COM1 38

S9S8S7

SEG3

SEG2

COM2 39

COM3 40

SEG1

COM4 41

S6

SEG0

VDD 42

A

C3C2C1

C44

R60 10k

R61 10k

B

SW60

Figure S-2. Control Panel Circuit

SWITCH UNIT CIRCUIT

SW1

SW2

CN - C

1

2

3

SW3

SW4

SW5

SW6

SW7

4

5

Figure S-3. Switch Unit Circuit

R-363 -

32

6

WARNING:

AC LINE VOLTAGE IS SUPPLIED TO ALL PARTS

ZD1

R30

LED1 LED2 LED3

DIP

WARNING:

TRANSLESS

R5

D2

C1

B

SP30

Q30

ZD40

E

B

C44

1

R41

1

E

Q40

2

R42

C42

(CF1)

R50

IC1

(SW1)

R12

D10

R10

R11

R31

(C60)

C50

C10

(C61)

16

R4

C22

C40

2242

C43

(J6)

21

(JSW2)

(SW2) (SW3)

CN - C

JW1

(J4)

JW1

R43

(J2)

C41

(J3)

R40

(J5)

,F

R20

RW

R72

(R65)

(R64)

(J7)

(R60)

3

C80
R81

(R61)

(R62)

R80

R3

(R63)

C20

ZD20
ZD21

D80

4

CN - B

1

41

(WH-1)

5

(SW4)

R1

ZD70

R2

R70

E

Q21

C21

B

E

D72

2

C70

ZD71

B

Q20

R71

E

B

6

D74

Q70

R73

C71

(SW5)

VRS1

(J1)

D71

D73

(SW6) (SW7)

RY2

C

B

D20

A

(WH-1)

4 1

51

D70

D3

CN - A

33

RY1

R-363 -

(SW60)

Figure S-4. Printed Wiring Board of Control Unit

PICTORIAL DIAGRAM

PRINTED WIRING BOARD OF SWITCH UNIT

SW6

SW4

SW2

DIP

SW5

SW3

61

CN - G

WHITE (EH)

SW7

GREEN (KR)

61

CN - C

SW1

Figure S-5. Printed Wiring Board of Switch Unit

R-363 -

34

PARTS LIST

Note: The parts marked “*” are used in voltage more than 250V. The parts marked "∆" may cause undue microwave exposure
“§” MARK: SPARE PARTS-DELIVERY SECTION

REF. NO. PART NO. §

ELECTRIC PARTS

∆

*

MG RV-MZA264WRE0 U Magnetron 1 BK

*

C RC-QZA222WRE0 U High voltage capacitor 1 AT
SW1 QSW-MA131WRE0 J Monitored latch switch 1 AK
SW2 QSW-MA133WRE0 J Monitor switch "C" 1 AN
SW3 QSW-MA131WRE0 J Stop switch 1 AK
FM RMOTEA361WRE0 U Fan motor 1 AT
F1 QFS-CAO25WRE0 J Fuse F8A 1 AC
OL RLMPTA066WRE0 U Oven lamp 1 AK
TTM RMOTDA227WRE0 U Turntable motor 1 AU
TC1 RTHM-A098WRE0 U Thermal cut-out 125°C (Magnetron) 1 AH
TC2 RTHM-A098WRE0 U Thermal cut-out 125°C (Oven) 1 AH
T RTRN-A016URE1 U Power transformer 1 BE

*

1-1 FH-DZA035WRE0 U H.V. rectifier assembly 1 AP

*

1-2 FPWBFA308WRE2 U Noise filter 1 AQ
1-3 QACCVA054WRE3 U Power supply cord 1 AR

CABINET PART

∆ ∆

2-1 GCABUA024URP0 U Outer case cabinet 1 AX
2-2 GDAI-A219WRP5 U Base plate 1 AS
2-3 GLEGPA028WRE0 U Foot 4AA

CONTROL PANEL PARTS

3- 1 DPWBFC030WRKZ U Control unit 1 BC
3- 1A QCNCMA430DRE0 U 3-pin connector (CN-A) 1 AC
3- 1B QCNCMA414DRE0 U 2-pin connector (CN-B) 1 AB
3- 1C QCNCMA330DRE0 U 6-pin connector (CN-C) 1 AB
3- 1D RLCDSA036DRE0 U Liquid crystal display 1 AP
3- 1E LHLD-A179WRF0 U LED holder 1 AE
3- 1F PSHEPA601WRE0 U LED sheet 1 AD
C1 VCEAB31CW227M U Capacitor 220 uF 16V 1 AB
C10 RC-KZA087DRE0 U Capacitor 0.1 uF 50V 1 AB
C20 VCEAB31VW227M U Capacitor 220 uF 35V 1 AC
C21 VCEAB31VW106M U Capacitor 10 uF 35V 1 AB
C22 VCEAB31HW104M U Capacitor 0.1 uF 50V 1 AA
C40 RC-KZA087DRE0 U Capacitor 0.1 uF 50V 1 AB
C41 VCEAB31CW476M U Capacitor 47 uF 16V 1 AA
C42 RC-KZA087DRE0 U Capacitor 0.1 uF 50V 1 AB
C43-44 VCKYD11CY103N U Capacitor 0.01 uF 16V 2 AA
C50 VCCCF61HH330J U Capacitor 33 pF 50V 1 AB
C60-61 VCKYD11CY103N U Capacitor 0.01 uF 16V 2 AA
C70 VCEAB31CW476M U Capacitor 47 uF 35V 1 AA
C71 VCEAB31VW107M U Capacitor 100 uF 35V 1 AB
C80 VCKYD11CY103N U Capacitor 0.01 uF 16V 1 AB
D1-3 VHD1N4005E61B U Diode (1N4005E) 3 AE
D10 VHD1SS270A/-1 U Diode (1SS270ATA) 1 AA
D20 VHD1SS270A/-1 U Diode (1SS270ATA) 1 AA
D70-71 VHD1N4005E61B U Diode (1N4005E) 2 AE
D72-74 VHD1SS270A/-1 U Diode (1SS270ATA) 3 AA
D80 VHD1SS270A/-1 U Diode (1SS270ATA) 1 AA
IC1 RH-IXA027DRZZ U LSI 1AZ
JW1 FW-VZA259DRZZ U 1-pin harness 1 AE
LED1-3 VHPSLP7117E-3 U Light emitting diode 3 AC
Q20 VSKRA101M//-3 U Transistor (KRA101M) 1 AA
Q21 VSKRC105M//-3 U Transistor (KRC105M) 1 AA
Q30 VSKRC101M//-3 U Transistor (KRC101M) 1 AB
Q40 VS2SA1267Y/-3 U Transistor (2SA1267Y) 1 AC
Q70 VSKRC105M//-3 U Transistor (KRC105M) 1 AA
R1-5 VRS-L63DA102J U Resistor 1.0k ohm 2W 5 AB
R10-11 VRD-B12EF273J U Resistor 27k ohm 1/4W 2 AA
R12 VRD-B12EF103J U Resistor 10k ohm 1/4W 1 AA

DESCRIPTION

Q’TY CODE

∆

*

*

*
*

R-363 -

35

PARTS LIST

Note: The parts marked ”*” are used in voltage more than 250V. The parts marked "∆" may cause undue microwave exposure
“§” MARK: SPARE PARTS-DELIVERY SECTION

REF. NO. PART NO. §

CONTROL PANEL PARTS CONTINUED

R20 VRD-B12EF822J U Resistor 8.2k ohm 1/4W 1 AA
R30 VRD-B12EF332J U Resistor 3.3k ohm 1/4W 1 AA
AAR31 VRD-B12EF153J U Resistor 15k ohm 1/4W 1 AA
R40 VRD-B12HF152J U Resistor 1.5k ohm 1/2W 1 AA
R41 VRD-B12EF102J U Resistor 1.0k ohm 1/4W 1 AA
R42 VRD-B12EF153J U Resistor 15k ohm 1/4W 1 AA
R50 VRN-B12EK103F U Resistor 10k ohm 1/4W 1 AA
R60-61 VRD-B12EF103J U Resistor 10k ohm 1/4W 2 AA
R62-63 VRD-B12EF472J U Resistor 4.7k ohm 1/4W 2 AA
R64 VRD-B12EF104J U Resistor 100k ohm 1/4W 1 AA
R70-71 VRS-B13AA361J U Resistor 360 ohm 1W 2 AA
R72 VRD-B12EF822J U Resistor 8.2k ohm 1/4W 1 AA
R73 VRD-B12EF153J U Resistor 15k ohm 1/4W 1 AA
R80 VRD-B12EF153J U Resistor 15k ohm 1/4W 1 AA
R81 VRD-B12EF472J U Resistor 4.7k ohm 1/4W 1 AA
RW VRD-B12EF104J U Resistor 100k ohm 1/4W 1 AA
RY1 RRLY-A080DRE0 U Relay (OJ-SH-124LM) 1 AG
RY2 RRLY-A094DRE0 U Relay (OMIF-S-112LM) 1 AL
SP30 RALM-A014DRE0 U Buzzer (PKM22EPT-THAI) 1 AG
SW60 RVR-BA018WRE0 U Encoder 1AH
VRS1 RH-VZA032DRE0 U Varistor (10G471K) 1 AC
ZD1 VHEHZ12C1//-1 U Zener diode (HZ12C1) 1 AA
ZD20-21 VHEHZ12C1//-1 U Zener diode (HZ12C1) 2 AA
ZD40 VHEHZ4C3///-1 U Zener diode (HZ4C-3) 1 AA
ZD70-71 VHEHZ7C2///-1 U Zener diode (HZ7C2) 2 AA
3- 2 FPWBFA053URK0 U Switch unit assembly 1 BC
3- 2-1 FW-VZA262DRZZ U 6-pin harness (CN-C) 1 AE
3- 2-2 QSW-PA016DRE0 U Tact switch (SW1-7) 7 AB
3- 3 GMADIA005URF0 U Display window 1 AE
3- 4 HPNLCS019URT0 U Control panel frame 1 AW
3- 5 HPNLCK012URR0 U Jog panel 1 AQ
3- 6 JBTN-K028URR0 U Express/Defrost button 1 AE
3- 7 JBTN-K027URF0 U Stop/Start button 1 AE
3- 8 JKNBKK008URF0 U Rotary knob 1 AC
3- 9 LSTPPA019URF0 U Stopper 1AB
3- 10 XEPSD30P10XS0 U Screw; 3mm x 10mm 9 AA

DESCRIPTION

Q’TY CODE

OVEN PARTS

4-1 FOVN-A004URT0 U Oven cavity 1 BL
4-2 LBNDKA107WRP1 U Capacitor holder 1 AD
4-3 PHOK-A002URF0 U Latch hook 1 AG
4-4 NFANJA001URE0 J Fan blade 1 AF
4-5 PDUC-A637WRF2 U Fan duct 1 AL
4-6 LANGFA155WRP7 U Chassis support 1 AF
4-7 PPACGA108WRE0 U Packing 1AC
4-8 PCUSUA340WRP2 U Air deflector cushion 1 AA
4-9 PCUSGA273WRP0 U Air separator 1 AC
4-12 NCPL-A042WRF1 U Coupling 1 AD
4-13 PCOVPA308WRE1 U Waveguide cover 1 AE
4-14 PFILWA042WRP0 U Lamp filter 1 AB
4-16 PDUC-A606WRF1 U Air intake duct 1 AK
4-17 PSPAGA001WRE0 U Vibration proof cushion 1 AA

R-363 -

36

PARTS LIST

Note : The parts marked “*” are used in voltage more than 250V. The parts marked "∆" may cause undue microwave exposure
“§” MARK: SPARE PARTS-DELIVERY SECTION

REF. NO. PART NO. §

DOOR PARTS

5-1 FDORFA287WRT0 U Door panel sub assembly 1 AW
5-2 GCOVHA365WRF2 U Choke cover 1 AM
5-3 GWAKPS021URT0 U Door frame (IN) 1 AT
5-4 PGLSPA026URR0 U Door glass 1 AX
5-5 LSTPPA017URF0 U Latch head 1 AG
5-6 MSPRTA197WREZ U Latch spring 1 AC
5-7 PSHEPA457WRE0 U Door film 1 AF
5-9 XCPSD30PO6000 J Screw 3mm x 6 mm 7 AA
5-10 JHNDPK002URF0 J Handle (BLK) 1 AD

MISCELLANEOUS

6-1 FROLPA002URK0 U Roller stay assy 1 AM
6-2 NTNT-A051WRE0 U Turntable 1 AN
6-4 TINS-A216URR0 U Instruction book 1 AS

* 6-6 QW-QZA210WRE1 U H.V. wire B 1 AD

6-7 FW-VZA077URE1 U Main wire harness 1 AU
6-8 TCAUHA006URR0 U Combined caution label 1 AE
6-10 TLABMA146URRO U Menu label 1 AE
6-11 LHLDKA008WRF0 U P-Clip 1AA

SCREW, NUT AND WASHER

7-1 XHTSD40P08RV0 J Screw 4mm x 8mm 4 AA

7-2 XEPSD40P25000 J Screw 4mm x 25mm 2 AA
7-4 XWWSD50-06000 J Washer 4mm x 0.6mm 1 AA
7-5 XOTSD40P12RV0 J Screw 18 AA
7-6 LX-LZA011WRE0 U Rivet 2AB
7-7 XHPSD40P08K00 J Screw with SP washer 4mm x 8mm 2 AA
7-8 XCPSD30P06000 J Screw 3mm x 6mm 1 AA
7-9 XFPSD50P10KS0 J Screw 4mm x 10mm 2 AB
7-10 XOTSE40P12000 J Screw 4mm x 12mm 4 AA
7-10 XOTSF40P12000 J Screw 4mm x 12mm 4 AA
7-11 LX-EZA045WRE0 J TTM cover screw 1 AA

DESCRIPTION

Q’TY CODE

∆
∆

∆

*

HOW TO ORDER REPLACEMENT PARTS

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

1. MODEL NUMBER 2. REF. NO.

3. PART NO. 4. DESCRIPTION

R-363 -

37

EXPLODED VIEW OF OVEN

CABINET AND UNIT CHASSIS PARTS

4-1

4-8

7-10

7-6

2-1

TC2

7-10

4-9

6-8

7-1

7-5

7-10

1-3

7-5

TC1

7-8

7-5

7-1

7-1

7-10

F1

1-3

6-11

7-7

4-5

1-2

4-6

FM

7-2

x 2

4-12

4-13

4-14

2-2

7-5

2-3

4-7

TTM

7-7

NOTE: In the event of removing the
turntable motor cover this part
should be refitted using screw
connection: LX-EZA045WRE0(7-11)

7-2

7-11

7-5

7-5

7-5

7-10

T

4.17

7-6

MG

7-5

4-4

7-5

4-3

x 4

6-2

SW3

SW2

SW1

4-16

OL

C

4-2

1-1

7-1

6-1

R-363 -

38

CONTROL PANEL/DOOR PARTS

CONTROL PANEL PARTS

3 - 5

3 - 4

3 - 3

3 - 8

3 - 6

3 - 2

3 - 7

3-1D

3-10

3-1F

3-1E

3 - 1

3-10

3 - 9

DOOR PARTS

5-3

5-10

5-9

X6

5-9

5-2

X3

5-4

5-5

5-1

5-6

R-363 -

39

MISCELLANEOUS/PACKING AND ACCESSORIES

MISCELLANEOUS

6-6

Actual wire harness may be different from illustration.

6-7

PACKING AND ACCESSORIES

ROLLER STAY

TRAY PACK
SPADPA015URE0

INTO THE
OVEN CAVITY
UNDERNEATH
TRAY PACK

OPERATION MANUAL/TINS-A216URR0
COOKBOOK/TCADCA013URR0

DOOR PROTECTION SHEET

SPADPA020WRE0

INTO THE
OVEN CAVITY
(DIAGONALLY)

TURNTABLE TRAY

MICROWAVE OVEN

TRAY PACK

Not replaceable items.

PACKING KIT
CPADBA146WRK0

POLYETHENE BAG
SSAKHA041WRE0

PACKING CASE
SPAKCA393URRO

R-363 -

40

NOTES

R-363 -

41

COPYRIGHT C 2000 BY SHARP CORPORATION

ALL RIGHT RESERVED.

No part of this publication may be reproduced,
stored in a retrieval system, or transmitted in
any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, without
prior written permission of the publisher.

R-363 -

SHARP CORP 2000 Printed in UK

42

CAUTION

MICROWAVE RADIATION

Personnel should not be exposed to the mircowave 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 energised.

VARNING

MIKROVÅGSSTRÅLNING

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

VAROITUS

MIKROAALTOSATEILYA

Käyttäjä ei saa joutua alttiiksi mikroaaltoenergialle, jota voi säteillä magnetronista tai muusta
mikroaaltoja kehittävästä laitteesta, jos sitä käytetään väärin tai jos se kytketään väärin. Kaikkien
mikroaaltoliitäntöjen sekä syöttö-että ulostulopuolella, aaltoputkien laippojen ja tiivisteiden tulee olla
varmistettuja.
Mikroaaltouunia 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 utstråles fra magnetronen eller andre
mikrobølge-generende deler dersom apparatet feilbetjenes eller blir feiltikoplet. Alle inn- og ut­tilkoplinger i forbindelse med mikrobølgestrålingen, bølgeledere, flenser og tetningsringer/pakninger må
festes ordentlig.
Aldri bruk apparatet med mindre en mikrobølgeabsorberende last er plassert i ovnsrommet. Aldri se
direkte inn i en åpen bølgeleder eller antenne imens apparatet er strømførende.

ADVARSEL

MIKROBØLGEBESTRÅLING

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 mikrobølgeabsorberende anordning. Se aldrig ind i en åben bølgeleder
eller antenne, mens ovnen er i brug.