Sharp R-771(W)N User manual

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SHARP SERVICE MANUAL
$11813R771EHW
—
MICROWAVE
OVEN
WITH
GRILL
AND
BOTTOM
HEATER
mopets R-771(W)N
~ R-771(B)
R-771(W)
R-771(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
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DESGRIPTION
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APPEARANCE
VIEW
/
WIRING/RE-WIRING.
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OPERATION
SEQUENCE
2...
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es
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Us
ssirantwneansegesoees
FUNCTION
OF
IMPORTANT
COMPONENTS)
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TOUCH
CONTROL
PANEL
ASSEMBLY
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TEST
PROCEDURES.
.......ssssccssserreonscssecsecesssncesscncnessssaceaceunsesennsssasasseansosecsenenensensnscanscnsonases
sai
susucasvonsants
DESCRIPTION
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LSI
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COMPONENT
REPLACEMENT
AND
ADJUSTMENT
PROCEDURE
.......ccccssssssseserserseseeeeeseseeessenseeseses
WARING
DIAGRAM
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excdeunh
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PICTORIAL
DIAGRAM
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ecto
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4
CONTROL
PANEL
CIRCUIT
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PRINTED
WIRING
BOARD
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PARTS
LIST
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OVEN
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eeseoneseuassnsanansnaaaacosscrsonsanensonccecesuasuccneneccans
CONTROL
PANEL
PARTS/DOOR
PARTS/MISC.
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46
PACKING
AND
ACCESSORIES.
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SHARP CORPORATION
R-771 - 1

CAUTION
MICROWAVE
RADIATION
Personnel!
will
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
far
inte
utsattas
for
mikrovagsenergi
som
kan
ustrala
fran
magnetronen
eller
andre
mikrovagsalstrande
anordningar
om
dessa
ar
felanslutna
eller
anvands
pa
fel
sait.
Alla
in-och
utgangsanslutningar
fér
mikrovagor,
vagledare,
flansar
och
packningar
maste
vara
fast
anslutna.
Mikrovagsgeneratorn
far
inte
arbeta
utan
att
absorberande
belastning
ar
ansluten.
Titta
aldrig
in
i@n
éppen
vagledare
eller
antenn
nar
mikrovagsgeneratorn
ar
pakoppiad
eller
laddad.
VAROITUS
MIKROAALTOSATELYA
Kayttaja
ei
saa
joutua
alttiiksi
mikroaaltoenergialle,
jota
voi
sateill4
magnetronista
tai
muusta
mikroaaltoja
kehittavasta
laitteesta,
jos
sita
kaytetaan
tai
jos
se
kytketaan
vaarin.
Kaikkien
mikroaaltoliitantdjen
seka
sy6tté-etta
ulostulopuolella,
aaltoputkien
laippojen
ja
tiivisteiden
tulee
olla
varmistettuja.
|
Mikroaaltouunnia
ei
koskaan
saa
kayttaa
ilman
kuormaa
jossa
mikroaaltoenergiaa
kuluu.
Avoimeen
aaltoputkeen
tai
antenniin
ei
koskaan
saa
katsoa
virran
ollessa
kytkettyna.
ADVARSEL
MIKROBOLGESTRALING
Personell
ma
ikke
utsettes
for
mikrobglge-energi
som
kan
utstales
fra
magnetronen
eller
andre
mikrobalge-generende
deler
dersom
apparatet
feilbetjenes
eller
blir
feiltikoplet.
Alle
inn-og
ut-tilkoplinger
i
forbindelse
med
mikrobalge-stralingen,
balgeledere,
flenser
og
tetningsringer/pakninger
ma
festes
ordentlig.
Aldri
bruk
apparatet
med
mindre
en
mikrobalge-absorberende
last
er
plassert
i
ovnsrommet.
Aidri
se
direkte
inn
i
en
Apen
balgeleder
eller
antenne
imens
apparatet
er
stramferende.
ADVARSEL
MIKROBOLGEBESTRALING
Man
ber
ikke
udsaatte
sig
for
mikrobglgebestraling
fra
magnetronen
eller
andre
mikrobalgefrembringende
anordninger,
hvilket
kan
ske
hvis
apparatet
er
forkert
tilsluttet
eller
bruges
forkert.
Alle
mikrobalgeindgange
og-udgange,
balgeledere,
flanger
og
teetningsstrimler
ma
veere
forsvarligt
udiert.
Anvend
aldrig
ovnen
uden
en
mikrobglgesabsorberende
anordning.
Se
aidrig
ind
ien
Aben
balgeleder
eller
antenne,
mens
ovnen
er
i
brug.
R771 - 2

en Be ee ee, oe,
a
5
SERVICE MANUAL
SHARP
MICROWAVE
OVEN
WITH
GRILL
AND
BOTTOM
HEATER
R-771(B) / R-771(W)
R-771(IN) / R-771(W)N
GENERAL IMPORTANT INFORMATION
This
Manual
has
been
prepared
to
provide
Sharp
Corp.
Service
engineers
with
Operation
and
Service
Information,
Itis
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
paris
marked
"*"
are
used
in
voltage
more
than
250V.
(Parts
List)
Anm:
Delar
market
med
"*"
har
en
spanning
6verstigande
250V.
Huom:
Huolto-ohjeeseen
merkitty
"tahdella"
osat
joissa
jannite
on
yli
250
V.
Bemerk:
Deler
som
er
merket
"asterisk"
er
utsatt
for
spenninger
over
250V
til
jord.
Bemeerk:
"Dele
market
med
stjerne
benyttes
med
hgjere
spzending
end
250
volt.
WARNING
; 0 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 to 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
"A"
on
the
parts
list
may
cause
undue
microwave
exposure,
by
themselves,
or
when
they
are
damaged,
loosened
or
removed.
Never
operate
the
oven
with
the
outer
cabinet
removed.
(Because
air
flow
is
eliminated,
and
the
excess
heat
generated
on
adjacent
components
can
cause
permanent
damage
or
fire).
SHARP CORPORATION
OSAKA, JAPAN
R-771 - 3

SOOM RT tear ree
tasted
enrol
SERVICING |
WARNING TO SERVICE PERSONNEL
result in.electrocution.
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 sec-
onds after the oven has been switched off. Wait for 60
seconds
and
ihen
short-circuit
the
connection
of
the
high-
voliage
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, inthis event carry out3D checks and
then disconnect the leads to the primary of the power trans-
former. 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.
Microwave
ovens
contain
circuitry
capable
of
producing
very
high
voltage
and
current,
contact
with
following
parts
will
High
voltage
capacitor,
Power
transformer,
Magnetron,
High
voltage
rectifier
assembly,
High
voltage
harness.
voltage capacitor (thatis, of the connecting lead of the high- |.
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
compo-
nent
being
tested.
When all service work is completed, and the oven is full
assembled,
the
microwave
power
output
should
be
checked
and
a microwave leakage test carried out.
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
geisoleerde
schroevedraaier kortsluit tegen het chassis.
Sharp
beveelt
ten
sterkste
aan
dat,
voor
zover
mogelijk,
defecten
worden
opgespoord
wanneer
de
stekker
uit
het
stopcontactis
gehaald.
Somsis
hetnodig
omde
stroomtoevoer
weer
tot
stand
te
brengen
nadat
de
buitenmantel
verwijderd
is.
Herhaal
dan
de
bovengenoemde
3
stappen
en
haal
de
electrische
draden
ult
de
primaire
zijde
van
de
vermogenstransformator.
Zorg
ervoor
dat
deze
draden
geisoleerd
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.
Conitroleer
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 iwee (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 aliereerste 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-771 - 4
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en yah an et orprgrntnatne en a nnrennaned ati fy Sant ig errata eae eit PE RAE
* cle TRS eS Sree STE AF r ey Ee
Los
hornos
de
microondas
contienen
circuitos
eléctricos
capaces
de
producir
voltajes
de
alta
tensi6n
y
descargas
eléctricas.
Para
evitar
el
riesgo
de
electrocucién,
absténgase
de
tocar
los
siguientes
componentes:
condensador
de
alta
tensi6n,
transformador
de
alta
tensién,
magnetrén,
dispositivo
del
rectificador
de
alta
tensién
y
arnés
de
alta
tension.
RECUERDE
LA
COMPROBACION
3D
_|
1)
Desconecte
la
alimentacion.
|
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
conexién
del
condensador
de
alio
voltaje
(esto
es,
del
conductor
de
conexién
del
rectificador
de
alto
voltaje)
al
chasis
con
un
destornillador
de
mango
aislado,
Se
recomienda
encarecidamente
que
siempre
que
sea
posible
la
localizacién
de
fallos
se
realice
con
la
alimentacién
desconectada.
Puede
ser
que
en
algunos
casos
sea
necesario
conectar
la
alimentacién
después
de
haber
retirado
la
carcasa
exterior.
En
este
caso,
realice
las
comprobaciones
3D
y
luego
desconecte
los
conductores
del
primario
del
_
jgtransformador
de
alimentacién.
Asegurese
de
que
esios
¥
conductores
permanezcan
aislados
de
otros
componentes
y
del
chasis
del
horno.
(Use
cinta
aislante
si
es
necesario).
Cuando
termine
la
prueba
efecite
las
comprobaciones
3D
y
reconecte
los
conductores
al
primario
del
transformador
de
alimentaci6on.
Kontakt
med
féljande
komponenter
kan
leda
till
dédsfall:
KOM
IHAG
ATT
KONTROLLERA
3
STEG
1) Koppla fran stromkallan.
2) Oppna dérren pa glant.
3) Ladda ur h6gspanningskondensaiorn.
VARNING FOR LADDNINGEN |
HOGSPANNINGSKONDENSATORN
Hégspanningskondensatorn
&r
laddad
i
60
sekunder
efter
det
att
ugnen
stangts
av.
Vania
60
sekunder
och
korislut
sedan
kondensatoms
anslutning
(dvs
ansiutningen
till
hdgspanningslikriktaren)
till
chassietmed
hjalp
aven
isolerad
skruvmejsel.
Sharp
rekommenderar
att
fels6kning
sker
med
strommen
frankopplad.
Ibland
kan
det
var
nédvandigt
att
koppla
pa
strommen
efter
det
att
hdljet
avlagsnats,
utfor
da
3
Steg
kontrollen
och
koppla
sedan
fran
ledarna
till
transformatorns
primarsida.
Se
till
att
ledarna
ar
isolerade
fran
andra
komponenter
och
chassiet.
(Anvand
Isoleringsband
om
det
behévs).
Nar
Du
testat
fardigt
utfér
Du
3
Steg
kontrollen
och
ansluter
ledningarna
till
transformatorns
primarsida
igen.
R-771
ger
RECUERDE
LA
COMPROBACION
4C
1)
Conecte
todos
los
componentes
desconectados
de
los
componentes
durante
la
prueba.
Coloque la carcasa exterior (cabina).
Conecte la alimentaci6n.
Compruebe
todas
sus
funciones
despues
de
poner
en
marcha e] horno.
Los
hornos
de
microondas
no
deben
funcionar
vacios.
Para
comprobar
!a
presencia
de
energia
de
microondas
dentro
de
una
cavidad,
coloque
una
taza
de
agua
fria
en
el
plato
giratorio
del
horno,
cierre
!a
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
fria,
efecttie
las
comprobaciones
3D
y
vuelvaa
examinar
las
conexiones
de
!os
componentes
que
han
sido
probados.
Cuando
haya
terminado
la
intervencion
en
el
equipo
y
e!
horno
haya
sido
ensamblado
de
nuevo
completamente,
debera
comprobar
la
potencia
de
salida
de
microondas
y
realizar
una
prueba
de
fugas
de
microondas.
MikrovAgsugnar
innehaller
kretsar
som
producerar
mycket
héga
sp&nningar
och
strommar.
Hdgspanningskondensator,
transformator,
magnetron,
hdgspannings
likriktare,
hgspannings
kablage.
KOM
IHAG
ATT
KONTROLLERA
4
STEG
4)
Anslut
alla
ledningar
som
anvants
vid
testning
2)
Saitt
tillbaka
ytterhdljet.
3)
Anslut
stromkallan
pa
nyit.
.
4)
S€tt
pA
ugnen.
Kontrollera
alla
funktioner.
Mikrovagsugnar
far
inte
anvandas
tomma.
Kontrollera
mikrovagsstrainingen
|
olika
delar
av
ugnen
genom
att
placera
en
kopp
med
kallt
vatten
p&
ugnens
tallrik,
stang
d6rren,
stall
in
HIGH
och
stall
in
2
minuter
pa
timern.
Nar
tva
minuter
har
gatt
(timem
visar
0)
kontrollerar
du
om
vattnet
ar
varmt.
Om
vatinet
fortfarande
ar
kallt
utfér
Du
3
steg
kontroller
och
kontrollerar
anslutningarna
till
varje
enskild
komponent
pa
nyit.
Nar
all
service
ar
klar
och
ugnen
ihopskruvad
skall
ugnens
uteffekt
och
eventuellt
mikrovagslackage
kontrolleras.
- §

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
1!
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
de!
condensatore
ad
alta
tensione
(cioé
del
conduttore
di
collegamento
del
raddrizzatore
ad
alta
tensione)
sul
telaiodelforno.
Sharp
raccomanda,
nei
limiti
del
possibile,
che
la
ricerca
dei
guasti
avvenga
in
assenza
di
alimentazione
elettrica.
in
alcuni
casi
tuttavia,
pud
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
del!'intervento,
eseguire
nuovamente
itre
controlli
e
ricollegare
i
conduttori
al
primario
de!
trasformatore.
\
forni
a
microonde
contengono
un
circuito
elettrico
in
grado
di
generare
tensioni
e
correnti
estremamente
elevate.
L'eventuale
contatto
con
i
seguenti
componenti
pud
causare
la
folgorazione:
condensatore
ad
alta
tensione;
trasformatore
ad
alta
tensione;
magnetron;
rettificatore
alta
tensione;
cablaggio
ad
QUATTRO
VERIFICHE
IMPORTANT!
DA
NON
DIMENTICARE
4)
Ricollegare
tutti
i
conduttori
staccati
dai
vari
componenti
durante
!'intervento.
2)
Rimontare
la
scatola
esterna.
3)
Ripristinare
l'alimentazione
elettrica.
4)
Rimettere
in
funzione
il
forno.
Controllare
tutte
fe
funzioni.
|
forni
a
microonde
non
devono
mai
funzionare
a
vuoto.
Per
verificare
la
presenza
di
energia
da
microonde
all'interno
di
una
cavita,
mettere
una
tazza
di
acqua
fredda
su!
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
caida.
Se
l'acqua
6¢/(
timasta
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,
€
necessario
controllare
la
potenza
delle
microonde
emesse
ed
eseguire
un
test
per
verificare
che
non
vi
sia
alcuna
dispersione.
‘®
R-771 - &

PRODUCT DESCRIPTION
SPECIFICATION
DESCRIPTION
Power
Requirements
230
Volts
|
50
Hertz
.
Single
phase,
3
wire
earthed
.
1
a
i
Power
Consumption
Microwave
cooking
1.6kW
Approx.
6.9A
Top
Grill
mode
1.25kW
=
Approx.
5.4A
Grill
cooking
Bottom
Heater
mode
0.85kW
=
Approx.3.7A
Top
and
Bottom
mode
2.05
kW
~~
Approx.
8.9A
‘
Micro
and
Top
Grill
2.8kW
Approx.
12.7A
Pual
cooking
Micro
and
Bottom
Heater
2.35
kW
Approx.
11
A
Power
Output
900
W
nominal
of
RF
microwave
energy
(measured
by
method
of
IEC
705)
Operating
fequency
2450
MHz
Grill
heating
element
Power
Output
(Top
Gritl}}
1200
W
(600
W
x
2)
Bottom
heating
element
Power
Output
|
800
W
.
E Cooking Cavity Dimensions .
207 mm
357 mm
Turntable
diameter
Ps2emm
Control
Complement
Twin-Jog
Touch
Conirol
System
Clock
(1:00
-
12:59
or
0:00
-
23:593)
/
Timer
(0
-
90
minutes
Microwave
Power
for
Variable
Cooking
520 mm
309 mm including foot
436 mm
349 mm
Repetition Rate;
TOO
FS
cei
ceceastwhenaactdsnicacnaedine
Full
power
throughout
the
cooking
time
FO
Pe
gircarstactathctentns
pias
Orinekerevicesinavisants
approx.
70%
of
FULL
Power
;
BOG
Gis
ivecuthiarasoananseaieanameenile
approx.
50%
of
FULL
Power
3
BO
SG
oscd
ea
eteascatessdati
eae
eume
chet
tiss
approx.
30%
of
FULL
Power
g
LOG
ieculiinisieue
niddvaevnatebittiewnncelinsereaae
approx.
10%
of
FULL
Power
|
LESS
(~)/MORE
(4)
buttons,
LANGUAGE
button
INFORMATION
button,
SNACK
buiton
PIZZA button, AUTO COOK/DEFROST button
MICROWAVE power button
Mode select knob
STOP button, MINUTE PLUS button
START button, CLOCK setting button
TIME/WEIGHT knob
Set
Weight
Approx.
19
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
R-771 - 7

OVEN
_
Control
panel
.
Oven
lamp
_
Grill
heating
element
(Top
Grill)
-
Door
opening
button
Waveguide
cover
Oven
cavity
_
Turntable
motor
shaft
_
Grill
heating
element
(Bottom
Heater)
9.
Door
seals
and
sealing
surfaces
40.Ventilation
openings
41,Outer
cabinet
42,Power
supply
cord
oy onrnan>
4.
Ensure
that
the
bottom
heater
is
in
the
lowest
position
as
shown
in
the
diagram,
as
itis
possible
Turntable
to
move
it
up
and
down
to
help
with
cleaning.
support
2.
Place
the
turntable
support
over
the
turntable
motor
shaft
on
the
floor
of
the
cavity.
3.
Then
place
the
turntable
on
to
the
turntable
SUP-
-
port.
=
an
SESS
Bottom
Turntable
oP
:
a
heater
motor
shaft
{
Digital
display
and
indicators
~
MICROWAVE
indicator
.
TOP
and
BOTTOM
GRILL
indicator
_
WEIGHT
(kg)
indicator
_
MICROWAVE
POWER
LEVEL
indicator
_
LESS/MORE
indicator
_
TIME
indicator
_
CLOCK
SET
indicator
.
COOK
indicator
_
INFORMATION
indicator
—_—
conrtanbkon
Operating
Buttons
40.
INFORMATION
button
44,
LANGUAGE
button
42.LESS/MORE
button
43.SNACK
button
44,.PIZZA
button
45.AUTO
COOK/DEFROST
buttons
46.DUAL
GRILL
button:
4
PRESS
=
MICROWAVE
&
TOP
GRILL
2
PRESSES
=
MICROWAVE
&
BOTTOM
GRILL
17.MICROWAVE
POWER
LEVEL
button
18.TOP
OR
BOTTOM
GRILL
button:
4
PRESS
=
TOP
GRILL
2
PRESSES
=
BOTTOM
GRILL
49,TOP
&
BOTTOM
GRILL
button:
(Top
and
Bottom
Grill
elements
in
use
together)
20.MINUTE
PLUS/START
buiton
91.STOP
bution
22.
CLOCK
SETTING
button
93,
TIME/WEIGHT
dial
24,.DOOR
OPEN
button
R-771
-
8

OPERATION
SEQUENCE
JFF CONDITION
slosing
the
door
activates
the
primary
latch
switch
and
the
itop
switch.
MPORTANT:
Nhen
the
oven
door
is
closed,
the
contacts
COM-NC
if
the
monitor
switch
must
be
open.
When
the
micro-
yave
oven
is
plugged
ina
wall
outlet
(230V
/50Hz),
the
ine
voltage
is
supplied
to
the
noise
filter
and
the
:ontrol
unit.
Figure O-1 on page 32
.
The
oven
display
will
flash
"PRESS
STOP"
in
6
lan-
guage.
»,
Press
the
STOP
button.
The
oven
display
will
flash
"SELECT
LANGUAGE’
in
6
languages.
}. Select language as follows.
3-1.
Choose
desired
language
by
pressing
the
LAN-
GUAGE
button.
3-2.
Start
the
setting
by
pressing
the
START
button.
The
oven
display
will
flash
"SET
CLOCK"
in
se-
lected
language.
|, Set the clock as follows.
4-1.
Choose
the
12
hour
clock
or
the
24
hour
clock
by
pressing
the
CLOCK
setting
button.
4.2.
Setthe
hours
by
rotating
the
TIME/WEIGHT
knob.
4-8.
Change
from
hours
to
minutes
by
pressing
CLOCK
setting
button.
.
4-4,
Set
the
minutes
by
rotating
the
TIME/WEIGHT
knob.
4-5,
Start
the
clock
by
pressing
the
CLOCK
setting
button.
NOTE:
.
{f
you
do
not
want
to
set
the
clock,
press
the
STOP
button
once
after
Janguage
is
chosen."
:
"
will
appear
on
the
display.
When
the
operation
of
the
oven
is
finished,
"
:
"will
appear
on
the
display
instead
of
the
time
of
day.
_
The
oven
can
be
also
used
when
the
language
and/or
the
clock
is
not
set..
|
3.
When
the
oven
door
is
opened,
the
oven
lamp
comes
on at this time.
ICROWAVE
COOKING
CONDITION
JIGH COOKING
Enter
a
desired
cooking
time
by
turning
the
TIME/WEIGHT
(nob
and
start
the
oven
by
pressing
START
button.
ow
Function sequence Figure O-2 on page 33
CONNECTED
COMPONENTS
RELAY
Oven
lamp,
Turntable
motor
RY1
High
voltage
transformer
RY1+
Grill
heating
element
RY1+
Botiom
heating
element
RY
1+
Fan
motor,
RY5
tL
I
|.
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
ihe
relays
RY1_
+
RY2
+
RY5
go
back
to
their
home
position.
The
circuits
to
the
oven
lamp,
high
voltage
transformer,
fan
motor
and
turntable
motor
are
cut
off.
5.
When
the
oven
door
is
opened
during
a
cooking
cycle,
the
switches
come
to
the
following
condition.
.
witch
ontact
ondition
During
Oven
Door
Cookin
Open(No
cooking)
Primary
latch
Switch
COM-NO
Closed
Opened
Stop
switch
COM-NO
Closed
Opened
Monitor
Switch
COM-NO
Closed
Opened
COM-NC
Opened
Closed
The
circuit
to
the
high
voltage
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
stay
closed.
Shown
in
the
display
is
remaining
time.
6. MONITOR SWITCH CIRCUIT
The
monitor
switch
SW3
is
mechanically
controlled
by
the
oven
door,
and
monitors
the
operation
of
the
primary
latch
switch
SW14.
6-1.
When
the
oven
door
is
opened
during
or
after
the
cycle
of
a
cooking
program,
the
primary
latch
switch
SW1
and
stop
switch
SW2
must
open
their
contacts
first.
After
that
the
contacts
(COM-NC)
of
the
monitor
switch
SW3
can
be
closed.
6-2.
When
the
oven
door
is
closed,
the
contacts
(COM-
NC)
of
the
monitor
switch
SW3
must
be
opened.
After
that
the
contacts
of
the
primary
latch
switch
SW1
and
the
stop
switch
SW2
are
closed.
6-3.
When
the
oven
door
is
opened
and
the
contacts
of
the
primary
latch
switch
SW1
remain
closed,
the
fuse
F2
F8A
will
blow,
because
the
monitor
switch
is
closed
and
a
short
circuit
is
caused.
MEDIUM
HIGH,
MEDIUM,
MEDIUM
LOW,
LOW
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-second
time
base
through
the
relay
contact
which
is
coupled
with
the
cur-
rent-limiting
relay
RY2.
The
following
levels
of
microwave
power
are
given.
42 sec, ON
SETTING 100% EINE Approx. 100%
24 sec. ON 6B sec, OFF
70%
Approx,
70%
1B sec. ON 44 sec. OFF
50% Approx. 50%
12 sec, ON 20 sec, OFF
30% Approx. 30%
6 sec. ON 26 sec, OFF
10% Approx. 10%
Note:
The
On/Offtime
ratio
does
not
exactly
correspond
to
the
percentage
of
microwave
power,
because
approx.
3
seconds
are
needed
for
heating
up
the
magnetron
filament.
R-771 - 9

GRILL
COOKING
CONDITION
The
oven
has
three
grill
cooking
conditions.
They
are
the
TOP
GRILL
mode,
BOTTOM
HEATER
mode
and
TOP
AND
BOTTOM
mode.
TOP
GRILL
MODE
In
this
mode,
the
food
is
cooked
by
the
grill
heating
elements
(top
grill).
Enter
the
cooking
time
by
rotating
the
TIMEWEIGHT
knob
and
select
the
TOP
GRILL
mode
by
rotating
the
mode
select
knob.
When
the
START
button
is
pressed,
the
following
operations
occur:
Figure
O-3(a)
on
page
33
.
The
relay
RY1
+
RY3
+
RY5
are
energized.
2.
Thenumbers
of
the
digital
readout
start
the
count
down
to
zero.
3,
Then
the
grill
heating
elements
(top),
turntable
motor,
oven
lamp
and
fan
motor
are
energized.
4,
Now,
the
food
is
grilled
by
the
grill
heating
elements.
5.
Upon
completion
of
the
selected
cooking
time,
audible
signal
sounds
and
the
contacts
of
relays
RY1
+
RY3
are
opened,
then
the
grill
heating
elements
(top),
turntable
motor
and
oven
lamp
are
de-energized.
6.
Therelay
RY5
stays
closed
for
five
(5)
minutes,
and
the
fan
motor
operates.
BOTTOM
HEATER
MODE
In
this
mode,
the
food
is
cooked
by
the
bottom
heating
element.
Enter
the
cooking
time
by
rotating
the
TIME/
WEIGHT.
knob
and
select
the
BOTTOM
HEATER
mode
by
rotating
the
mode
select
knob.
When
the
START
button
is
pressed,
the
following
operations
occur:
—_t
Figure
0-3(b)
on
page
34
1.
The
relay
RY1
+
RY4+
RY5
are
energized.
2.
Thenumbers
ofthe
digital
readout
start
the
count
down
{oO
zero.
3.
Then
the
bottom
heating
element,
turntable
motor,
oven
lamp
and
fan
motor
are
energized.
4,
Now,
the
food
is
grilled
by
the
bottom
heating
element.
5.
Upon
completion
of
the
selected
cooking
time,
audible
signal
sounds
and
the
contacts
of
relays
BY1
+
RY4
are
opened,
then
the
bottom
heating
elements,
turnta-
ble
motor
and
oven
lamp
are
de-energized.
-
6.
Therelay
RY5
stays
closed
for
five
(5)
minutes,
andthe
fan
motor
operates.
TOP
AND
BOTTOM
MODE
NE
In
this
mode,
the
food
is
cooked
by
both
the
grill
heating
elements
(top
grill)
and
bottom
heating
elemeni.
Enter
the
cooking
time
by
rotating
the
TIME/WEIGHT
knob
and
selectthe
TOP
AND
BOTTOM
mode
by
rotating
the
mode
select
knob.
When
the
START
button
is
pressed,
the
following
operations
occur:
Figure
0-3(c)
on
page
34
.
The
relay
RY1
+
RY3
+
RY4
+
RYS
are
energized.
2.
The
numbers
ofthe
digital
readout
start
the
count
down
to
zero.
3,
Then
the
grill
heating
elements
(top),
bottom
heating
element,
turntable
motor,
oven
lamp
and
fan
motor
are
energized.
4.
Now,
the
food
is
grilled
by
the
grill
heating
elements
(top)
and
the
bottom
heating
element.
5.
Upon
completion
ofthe
selected
cooking
time,
audible
signal
sounds
and
the
contacts
of
relays
RY1
+
RY3
+
th
RY4
are
opened,
then
the
grill
heating
elements
(top),
bottom
heating
element,
turntable
motor
and
oven
lamp
are
de-energized.
6.
The
relay
RY5
stays
closed
for
five
(5)
minutes,
and
the
@
fan motor operates.
DUAL
COOKING
CONDITION
The
oven
has
two
dual
cooking
mode.
One
is
MICRO-
WAVE
AND
TOP
GRILL
mode
and
other
one
is
MICRO-
WAVE
AND
BOTTOM
HEATER
mode.
In
both
modes,
the
relay
RY2
operaies
intermittently
with
in
a
48
seconds
time
base
as
shown
below.
Power
level!
ON
time
OFF
time
100%
48
sec.
0
sec.
70%
36
sec.
12
sec
50%
26
sec.
22
sec.
30%
16
sec.
32
sec
10%
8
sec.
40
sec
Power
level
0%
can
not
be
programmed
in
Dual
Cooking
condition.
MICROWAVE
AND
TOP
GRILL
MODE
NSA
A
————————o
inthis
mode,
the
food
is
cooked
by
microwave
and
the
grill
heating
elements
(top).
Enter
the
cooking
time
by
rotating
the
TIME/WEIGHT
knob
and
select
the
MICROWAVE
AND TOP
GRILL
mode
by
rotating
the
mode
select
knob.
And
select
the
power
level
by
pressing
the
MICROWAVE
power
button.
When
the
START
button
is
pressed,
the
following
operations
occur:
4.
The
relay
RY1
+
RY2
+
RY3
+
RY5
are
energized.
©.
Thenumbers
ofthe
digital
readout
start
the
countdown
to zero.
3.
The
grill
heating
element
(top),
high
voltage
trans-
dis:
former,
turntable
motor,
oven
lamp
and
fan
motor
are
energized.
4.
Now,
the
food
is
cooked
by
the
microwave
and
grill
heating
element
(top).
5.
Upon
completion
of
the
selected
cooking
time,
audible
signal
sounds
and
the
contacts
of
relays
BY1+RY2
+
RY3
are
opened,
then
the
grill
heating
element
(top),
high
voltage
transformer,
turntable
motor
and
oven
lamp
are
de-energized.
6.
Therelay
RY5
stays
closed
for
five
(5)
minutes,
and
the
fan
motor
operates.
MICROWAVE
AND
BOTTOM
HEATER
MODE
MCROWAVE
A
—e—eEeeE—E—EE——ee——_—_e
In
this
mode,
the
food
is
cooked
by
microwave
and
the
bottom
heating
element.
Enter
the
cooking
time
by
rotating
the
TIME/WEIGHT
knob
and
select
the
MICROWAVE
AND
BOTTOM
HEATER
mode
by
rotating
the
mode
select
knob.
And
select
the
power
level
by
pressing
the
MICROWAVE
power
button.
When
the
START
button
is
pressed,
the
following
operations
occur:
4.
The
relay
BY1
+
RY2
+
RY4
+
RY5
are
energized.
9
Thenumbers
ofthe
digital
readout
startthe
count
down
to
zero.
3.
The
bottom
heating
element,
high
voltage
transformer,
turntable
motor,
oven
lamp
and
fan
motor
are
ener-
gized.
4.
Now,
the
food
is
cooked
by
the
microwave
and
bottom
heating
element.
5.
Uponcompletion
of
the
selected
cooking
time,
audible
signal
sounds
and
the
contacts
of
relays
RY1+
RY2
+
RY4
are
opened,
then
the
bottom
heating
elements,
high
voltage
transformer,
turntable
motor
and
oven
lamp
are
de-energized.
R-771 - 10
@
SD
—_—_

6.
Therelay
RYS
stays
closed
for
five
(5)
minutes,
andthe
fan
motor
operates.
SNACK/
PIZZA
COOKING
SNACK/PIZZA
automatically
works
out
the
correct
cook-
ing
mode
and
time
for
cooking.
What
should
be
done
is
to
chose
menu
and
to
enter
the
weight
of
the
food
with.the
weight
entry
touch
pad.
Once
the
oven
Starts,
it
will
cook
according
to
the
special
cooking
sequence.
AUTO COOKING
AUTO
COOK
automatically
works
out
the
correct
cooking
mode
and
time
for
cooking.
What
should
be
done
is
to
chose
menu
and
to
enter
the
weight
of
the
food
with
the
weight
entry
touch
pad.
Once
the
oven
starts,
it
will
cook
according
to
the
special
cooking
sequence,
AUTO DEFROST
AUTO
DEFROST
automatically
works
out
the
correct
microwave
power
and
time
for
defrosting.
What
should
be
Jone
is
to
chose
menu
and
to
enter
the
weight
of
the
food
vith
the
weight
entry
touch
pad.
Once
the
oven
starts,
it
will
00k
according
to
the
special!
cooking
sequence.
-IMITATIONS
OF
POWER
OUTPUT
IN
MANUAL
>PERATION—-
\iter
the
same
cooking
mode
is
carried
out
for
more
than
he
specified
cooking
time,
the
power
output
is
automati-
‘ally
reduced
by
turning
the
control
relays
on
and
off
itermittently,
as
shown
in
the
table
below.
This
is
to
‘OOR
OPEN
MECHANISM
he
door
can
be
opened
by
pushing
the
open
button
onthe
dntrol
panel.
When
the
open
button
is
pushed,
the
open
ver
is
moved
upward,
operating
the
latch
head.
The
latch
2ad
is
moved
upward
and
released
from
the
latch
hook.
ow,
the
door
can
be
opened.
MONITOR SWITCH
PRIMARY
LATCH SWITCH
“SE STOP SWITCH
OPEN LEVER
Figure
D-1.
Door
Open
Mechanism
IMARY
LATCH
SWITCH
SWi
AND
STOP
NTCH
SWe2
When
the
oven
dooris
closed,
the
contacts
(COM-NO)
of
each
switch
must
be
closed.
WVhen
the
oven
door
is
opened,
the
contacts
(COM-
protect
the
oven
door
against
temperature
rising.
Cooking
mode
__j
time
(minutes
output
(%
seconds
70 32
50
Bottom heater
: 70
U|griltheater
|
15
(Gril)
|
70
bottom
heater|
15
(Heater)
|
50
48
NOTE:
1.
In
case
of
Automatic
operations,
the
limitations
of
power
output
are
not
carried
out.
2.
In
case
that
the
stop
button
is
pressed
or
the
oven
door
is
opened
during
cooking,
the
limitations
of
power
output
are
not
carried
out
after
the
total
cooking
time
beyond
the
specified
cooking
time.
3.
In
case
of
the
two
or
more
same
cooking
modes
are
carried
out,
the
limitations
of
power
output
are not
carried
out
after
the
total
cooking
time
beyond
the
specified
cooking
time.
4.
Incase
ofthe
two
or
more
different
cooking
modes
are
carried
out,
the
specified
cooking
time
is
started
to
countfrom
the
point
when
the
cooking
modeis
changed.
5.
If
the
cooking
mode
has
the
power
level
display,
the
power
level
is
also
displayed
when
the
limitations
of
power
output
are
carried
out.
cs Fev]
ao
re
;&
8
->
FUNCTION
OF
IMPORTANT
COMPONENTS
NO)
of
each
switch
must
be
opened.
MONITOR
SWITCH
SW3
1.
When
the
door
is
closed,
the
contacts
(COM-NC)
must
be
opened
and
the
contacts
(COM-NO)
must
be
closed.
2.
When
the
door
is
opened,
the
contacts
(COM-NC)
must
be
closed
and
the
contacts
(COM-NO)
must
be
closed.
3.
Ifthe
oven
door
is
opened
and
he
contacts
(COM-NO)
of
the
primary
latch
switch
SW1
fail
to
open,
the
fuse
Fe
8A
blows
immediately
after
closing
the
contacts
(COM-NC)
of
the
monitor
switch
SW3.
CAUTION:
BEFORE
REPLACING
A
BLOWN
FUSE
F8A
TEST
THE
PRIMARY
LATCH
SWITCH
SW1,
MONITOR
SWITCH
SW3
AND
MONITOR
RESISTOR
(MOUNTED
NOISEFI
LTER)
FOR
PROPER
OPERATION.
(REFER
TO
CHAP-
TER
“TEST
PROCEDURE”).
SPECIAL
FUSE
F1
15A
if
the
wire
harness
or
electrical
components
are
shori-
circuited,
this
fuse
Fiblows
to
prevent
an
electric
shock
of
fire
hazard.
R-771 - 114
ae ET ya oe SaR-LS, = ap lg eth tons
SRS SRT
ow ies apt de.

FUSE
F2
F8A
250V
4.
Ifthe
wire
harness
or
electrical
components
are
short-
circuited,
this
fuse
F2
blows
to
prevent
an
electric
shock
of
fire
hazard.
2.
Thefuse
F2also
blows
when
asymmetric
rectifier,
H.V.
rectifier,
H.V.
wire
harness,
H.V.
capacitor,
magnetron
or
secondary
winding
of
high
voltage
transformer
is
shorted.
ASYMMETRIC
RECTIFIER
The
asymmetric
rectifier
is
a
solid
state
device
that
pre-
vents
current
flow
in
both
directions.
And
it
prevents
the
temperature
rise
of
the
high
voltage
transformer
by
blow-
ing
the
fuse
Fe
EBA
when
the
high
voltage
rectifier
is
shorted.
The
rated
peak
reverse
voltage
nf
D1
of
the
asymmetric
(Oe
ag
Pt
ASYMMETRIC
RECTIFIER
HIGH
VOLTAGE
RECTIFIER
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
F2
F8A.)
4.
The
high
voltage
rectifier
is
shorted
by
any
cause
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
volt-
age
winding
of
the
high
voltage
transformer.
5.
The
large
electric
currents
beyond
8A
flow
through
the
primary
winding
of
the
high
voltage
transformer.
§.
The
fuse
F2
blows
by
the
large
electric
currents.
7.
The
power
supply
to
the
high
voltage
transformer
is
cut
off.
THERMAL
CUT-OUT
TC1
125°C
(MG)
This
thermal
cut-out
protects
the
magnetron
against
over-
heating.
If
the
temperature
goes
Up
higher
than
125°C
because
the
fan
motor
is
interrupted
or
the
ventilation
openings
are
blocked,
the
thermal
cut-out
TC
will
open
and
line
voltages
to
the
high
voltage
transformer
will
be
cut
off
and
the
operation
of
the
magnetron
will
be
stopped.
@
THERMAL
CUT-OUT
TC2
150°C
(OVEN)
The
thermal
cut-out
located
on
the
side
of
the
air
guide
ductis
designed
to
prevent
damage
to
the
oven
ifthe
foods
in
the
oven
catch
fire
due
to
over
heating
produced
by
improper
setting
of
the
cooking
time
or
failure
of
conirol
unit.
Under
the
normal
operation,
the
oven
thermal
cut-out
TC2
remains
closed.
However,
when
abnormally
high
temperature
are
reached
within
the
oven
cavity,
oven
thermal
cut-out
TC2
will
open
at
150°C
causing
the
oven
to
shut
down.
The
thermal
cut-out
will
cut
back
in
at
130°C.
TURNTABLE
MOTOR
TTM
The
turntable
motor
drives
the
turntable
roller
assembly
to
rotate
the
turntable.
FAN
MOTOR
FM
Thefan
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
chan-
nelled
through
the
oven
cavity
to
remove
steam
and
vapours
given
off
from
heating
food.
It
is
then
exhausted
through
the
exhausting
air
vents
of
the
oven
cavity.
NOISE
FILTER
The
noise
filter
assembly
prevents
radio
frequency
inter-
ference
that
might
flow
back
in
the
power
circuit.
GRILL
HEATING
ELEMENT
(TOP
GRILL)
GHi
The
grill
heating
element
GH1
is
located
on
the
top
of
the
oven
cavity
assembly.
The
grill
heating
element
GHi
sends
out
heat
to
grill
foods.
BOTTOM
HEATING
ELEMENT
GH2
The
bottom
heating
element
GH2
is
located
on
the
floor
of
the
oven
cavity
assembly.
The
bottom
heating
element
GH2
sends
out
heat
to
grill
foods.
TROUBLESHOOTING
GUIDE
When
troubleshooting
the
microwave
oven,
itis
helpful
to
followthe
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
proce-
dure
letter
which
will
be
found
in
the
"Test
Procedure”
section.
R-771
IMPORTANT:
ifthe
oven
becomes
inoperative
because
of
a
blown
fuse
E2
(F8A)
in
the
primary
latch
switch
-
monitor
switch
-
monitor
resistor
circuit,
check
the
primary
latch
switch,
monitor
switch
and
monitor
resis-
tor
(mounted
on
noise
filter)
before
replac-
@
ing
the
fuse
F2
(F8A).
- 12
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Fuse Fi i5A blows when power
cord is plugged into wall outlet.
Oven lamp does not light when door
is opened. (Display operates.)
Home fuse blows when power cord
is plugged into wall outlet.
"PRESS STOP" does not appear in
display when power cord is plugged
into wail outlet.
Display does not operate properly ©
when STOP button is pressed.
Oven does not start when the
START buiton is pressed. (Display
operates.)
Oven lamp does not light. (Turnta-
ble motor operates.)
Fan motor does not operate. (Oven
lamp lights.)
Turntable motor does not operate.
(Oven jamp lights.) .
Oven or electrical parts does not
stop when cooking time is 0 or
. | STOP button is pressed.
Oven goes into cook cycle but shuts
down before end of cooking cycle.
Oven seems to be operating but al
tle or no heat is produced in oven
load.
Oven
does
not
operating
properly
during variable cooking condition
except 100% cooking condition. —
Oven goes into cook cycle but shuts
down before end of cooking cycle.
Grill heating element (top) does op-
erate.
Bottom
heating
element
does
oper-
EAT
ate,
Oven seems to be operating but lit-
tle or no heat is produced in oven
load. (Microwave power does not
seem to be generated properly.)
Grill heating element (top) does op-
erate.
a
SATAY
ate.
R-771 - 13
OFF
CONDITION
a
, FCOOKING
\ IcoONDITION
(COMMON MODE}
MICROWAVE
COOKING
CONDITION

TEST
PROCEDURES
PROCEDURE
LETT
A
ER
COMPONENT
TEST
MAGNETRON
TEST
)
NEVER
TOUCH
ANY
PART
IN
THE
CIRCUIT
WITH
YOUR
HAND
OR
AN
INSULATED
TOOL
e
WHILE
THE
OVEN
IS
IN
OPERATION.
CARRY
OUT
3D
CHECKS.
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
filamentto
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
ts
obtained
then
the
magnetron
should
be
replaced.
MICROWAVE
OUTPUT
POWER
(IEC-705-1988)
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
705,
i.e.
it
is
measured
by
how
much
power
the
water
load
can
absorb.
To
measure
the
microwave
output
power
in
the
microwave
oven,
the
relation
of
calorie
and
wait
is
used.
When
P{W)
@
heating
works
for
t(second},
approximately
P
x
+/4.187
calorie
is
generated.
On
the
other
hand,
if
the
temperature
of
the
water
with
V(mil)
rises
AT
(°C)
during
this
microwave
heating
period,
the
calorie
of
the
water
is
V
x
AT.
The
formula
is
as
follows;
Pxt/4.187=VxAT
PW)
=4.187xVxAT/t
Our
condition
for
water
load
is
as
follows:
Room
temperature
.........-
around
20°C
Power
supply
Voltage
......-+.++
Rated
voltage
Water
load
......ssccsesererssessnecanereers
Initial
temperature
.......serererrrerenerseees
:
,
Heating
time
......cccseeseererenees
:
P=90x
AT
.
®
Measuring
condition:
4.
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
199
mm.
2.
Temperature
of
the
oven
and
vessel
The
oven
and
the
empty
vessel
are
at
ambient
temperature
prior
to
the
start
the
test.
3,
Temperature
of
the
water
The
initial
temperature
of
the
water
is
(10+2)°C.
4.
Selecttheinitial
and
final
water
temperature
so
thatthe
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
ihermomeier
must
be
scaled
by
0.1°C
at
minimum
and
be
an
accurate
thermometer.
7.
The
water
load
must
be
(1
000:5)
g.
8.
"t"ig
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.)
Therefore
total
heating
time
=
50
sec.
Measuring
method:
4.
Measure
the
initial
temperature
of
the
water
before
the
water
is
added
to
the
vessel.
(Example:
The
initial
temperature
T1
=
11°C)
_
Ada
the
1
litre
water
to
the
vessel,
_
Place
the
load
on
the
centre
of
the
shelf.
;
.
Operate
the
microwave
oven
at
HIGH
for
the
temperature
of
the
water
rises
by
a
value
AT
of
&
(10
+2)
K.
_
Stir
the
water
to
equalize
temperature
throughout
the
vessel.
rel
_
Measure
the
final
water
temperature.
(Example:
The
final
temperature
T2
=
21
°C)
_
Calculate
the
microwave
power
output
P
in
watts
from
above
formula.
f G fo
“om Oo
R-771 - 14
ee
AE
RTD
ET
TEAS
OR
7 $o—

TEST
PROCEDURES
(CONT'D)
PROCEDURE
LETTER
COMPONENT
TEST
Initial
temperature
Temperature
after
(47
+
Temperature
difference
Cold-Warm
Measured
output
power
The
equation
is
“P
=
90
x
AT”
JUDGMENT:
The
measured
output
power
should
be
at
least
=
15
%
of
the
rated
output
power.
-
CAUTION:
1°C
CORRESPONDS
TO
90
WATTS.
REPEAT
MEASUREMENT
IF
THE
POWER
!S
INSUFFICIENT.
Heat
up
for
50
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.
Itis
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
8D
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
ona
low
range,
it
is
possible
to
check
the
continuity
of
all
three
winding.
The
following
readings
should
be
obtained:-
a,
Primary
WINING
.....ccsseeeeeeeseneeseeseesees
approximately
1.9
2
b,
Secondary
WINING
.......seeeseeertesenrees
approximately
96
c.
Filament
Winding
..........ecssseeseeseeeneeeeneenenertees
less
than
71
2
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.
nena
Cc
HIGH
VOLTAGE
RECTIFIER
ASSEMBLY
TEST
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
ohmmeiter
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
kQ
in
the
other
direction.
CARRY
OUT
4R
CHECKS.
5
ASYMMETRIC
RECTIFIER
TEST
ASYMMETRIC
/
RECTIFIER
CARRY
OUT
3D
CHECKS.
C/
HIGH
VOLTAGE
RECTIFIER
Isolate
the
high
voltage
rectifier
assembly
from
the
HV
circuit.
The
asymmetric
can
be
tested
using
an
ohmmeter
set
to
its
highest
range
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
direction
then
the
asymmetric
rectifier
is
good.
If
an
asymmetric
rectifier
is
shorted
in
either
direction,
then
the
asymmetric
rectifier
is
probably
faulty
and
must
be
replaced
with
high
voltage
rectifier.
When
the
asymmetric
rectifier
is
defective,
check
whether
magnetron,
high
voltage
rectifier,
high
voltage
wire
or
filament
winding
of
the
high
voltage
transformer
is
shorted.
R-771 - 15

ot Henan dene renee
+EST
PROCEDURES
(CONT'D)
COMPONENT
TEST
PROCEDURE
LETTER
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
&
VOLTS,
BE-
&
CAUSE
OTHERWISE
AN
INFINITE
RESISTANCE
MIGHT
BE
SHOWN
IN
BOTH
DIREC-
TIONS.
D
WIGH
VOLTAGE
CAPACITOR
TEST
CARRY
OUT
3D.
CHECKS.
A.
\solate
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.
Anormal
capacitor
shows
continuity
for
a
short
time
(kick)
and
ihen
a
resistance
of
about
10M
after
it
has
been
charged.
D.
A
short-circuited
capacitor
shows
continuity
all
the
time.
E.
An
open
capacitor
constantly
shows
&
resistance
about
10
MQ
because
of
its
internal
10M&2
resistance.
=.
When
the
internal
wire
is
opened
in
the
high
voltage
capacitor
shows
an
infinite
resistance.
G.
The
resistance
across
all
the
terminals
and
the
chassis
must
be
infinite
when
the
capacitor
is
normal.
lf
incorrect
reading
are
obtained,
the
high
voltage
capacitor
must
be
replaced.
CARRY
OUT
48
CHECKS.
E
SWITCH
TEST
CARRY
OUT
3D
CHECKS.
.
isolate
the
switch
to
be
tested
and
using
an
ohmmeter
check
between
the
terminals
as
described
in
the
following
table.
Table:
Terminal
Connection
of
Switch
@
COM;
Common
terminal,
Released
—Spen
creuit
|
__Shorterouit__|
NO;
Normally
open
terminal
Depressed
her
crout
|
__Openccrouft__|
NC;
Normally
close
terminal
\f
incorrect
readings
are
obtained,
make
the
necessary
switch
adjustment
or
replace
the
switch.
CARRY
OUT
48
CHECKS.
F
THERMAL
CUT-OUT
TEST
CARRY
OUT
3D
CHECKS.
©
Disconnectthe
leads
from
the
terminals
of
the
thermal
cut-out.
Then
using
an
ohmmeter,
make
a
continuity
test
across
the
two
terminals
as
described
in
the
below.
Table:
Thermal
Cut-out
Test
Temperature
of
"ON"
condition
(closed
circuit).
|
condition
(open
circuit).
°C)
CC)
Thermal
cut-out
125°C
Above
125°C
if
incorrect
readings
are
obtained,
replace
the
thermal
cut-out.
Indication
of
ohmmeter
(Whenroom
temperature
is
approx.
20°C.)
.
Parts
Name
Closed
circuit
Closed
circuit
An
open
circuit
thermal
cut-out
C1
(MG)
indicates
that
the
magnetron
has
overheated,
this
may
be
due
to
resistricted
ventilation,
cooling
fan
failure
or
a
fault
condition
within
the
magneiron
or
HV.
circuit.
An
open
circuit
thermal
cut-out
TG2
(OVEN)
indicates
that
the
food
in
the
oven
cavity
may
catch
fire,
this
may
be
due
to
over
heating
produced
by
improper
setting
of
the
cooking
timer
or
failure
of
the
@:
control
panel.
4
CARRY
OUT
4R
CHECKS.
@
R-771
-
16
a ens
A Tt P
= recat ee keep tte ee

PROCEDURE
LETTER
sO
COMPONENT
TEST
G
BLOWN
EUSE
5A
(F1)
TEST PROCEDURES (CONT'D)
CARRY OUT 3D CHECKS.
Ifthe
fuse
15A
is
blown,
there
could
be
a
shorts
or
grounds
in
elecirical
parts
or
wire
harness.
Check
them
and
replace
the
defective
parts
or
repair
the
wire
harness.
CARRY OUT 4R CHECKS.
CAUTION:
Only
replace
fuse
15A
with
the
correct
value
replacement.
H
BLOWN
FUSE
F8A
(F2)
———=-—_>—_——
a
CARRY OUT 3D CHECKS.
lfthe
fuse
F8A
(F3)
is
blown,
there
could
be
a
short
in
the‘asymmetric
rectifier
or
there
is
a
ground
in
wire
harness.
Ashort
inthe
asymmetric
rectifier
may
be
occurred
due
to
short
or
ground
inH.V.
rectifier,
magneiron,
high
voltage
transformer
or
H.V.
wire.
Check
them
and
replace
the
defective
parts
or
repair
the wire harness.
CARRY
OUT
4R
CHECKS.
CAUTION:
Only
replace
fuse
with
the
correct
value
replacement.
i
NOISE
FILTER
TES
9)
RTEST
N
WHT
CARRY OUT 3D CHECKS.
Disconnect
the
leads
from
the
terminals
of
noise
filter.
L
Using
an
ohmmeter,
check
between
the
terminals
as
o—-=-0
described in the following table.
RED
MEASURING
POINTS
INDICATION
OF
OHMMETER
Between
N
and
L
Approx.
680
kQ
Between
terminal
N
and
WHITE
|
Shortcircuit
ST
Between
terminal
L
and
RED
|
Shortcircuit
SSS=*S
if
incorrect
readings
are
absorbed,
replace
the
noise
filter
unit.
CARRY OUT 4R CHECKS.
|
J
MOTOR
WINDING
TEST
CARRY
OUT
3D
CHECKS.
Disconnect
the
leads
from
the
motor.
Usin
terminals
as
described
in
the
table
below.
Table: Resistance of Motor
Turntable motor
If
incorrect
readings
are
obtained,
replace
the
motor.
CARRY
OUT
4R
CHECKS.
Resistance
Approximately 320 2
Approximately 15.5 kQ
R-771 - 17
g
an
ohmmeter,
check
the
resistance
between
the
two
“SET GE tere ere
TRE AE BRIT rat eit ny cee
TTS Pes ree prmeep rem rece,

TEST
PROCEDURES
(CONT'D)
PROCEDURE
LETTER
COMPONENT
TEST
K
GRILL
HEATING
ELEMENT
(TOP)
AND
BOTTOM
HEATING
ELEMENT
TEST
:
&
CARRY
OUT
3D
CHECKS.
Before
carrying
out
the
following
tests
make
sure
the
heating
element
is
cool
completely.
®
1.
Resistance
of
heating
element.
Disconnect
the
wire
leads
to
the
heating
element
to
be
tested.
Using
ohmmeter
with
low
resistance
range.
Check
the
resistance
across
the
terminals
of
the
heating
element
as
described
in
the
following
table.
Table:
Resistance
of
heating
element
Paris
name
Resistance
Bottom
heating
element
Approximately
66
&
2.
Insulation
resistance.
Disconnect
the
wire
leads
to
the
heating
element
to
be
tested.
Check
the
insulation
resistance
between
the
element
terminal
and
cavity
using
a
500V
-
400MQ
insulation
tester.
The
insulation
resistance
should
be
more
than
10
MQ
in
the
cold
start.
if
the
results
of
above
test
1
and/or
2
are
out
of
above
specifications,
the
heating
elementis
probably
faulty
and
should
be
replaced.
e
CARRY
OUT
4R
CHECKS.
|
L.
TOUCH
CONTROL
PANEL
ASSEMBLY
TES
The
touch
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.
Inthis
service
manual,
the
touch
control
panel
assembly
is
divided
into
two
units,
Control
Unit
and
Key
Unit,
and
troubleshooting
by
replacement
is
described
according
to
the
symptoms
indicated.
a
1.
Key
Unit
Note:
Check
key
unit
ribbon
connection
before
replacement.
@
The
following
symptoms
indicate
a
defective
key
unit.
Replace
the
key
unit.
a)
When
touching
the
pads,
a
certain
pad
produces
no
signal
at
all.
b)
When
touching
a
number
pad,
two
figures
or
more
are
displayed.
ce)
When
touching
the
pads,
sometimes
a
pad
produces
no
signal.
2,
Control
Panel
The
following
symptoms
indicate
a
defective
contro!
unit.
Before
replacing
the
conirol
unit.
perform
the
key
unit
test
(Procedure
N)
to
determine
if
control
unit
is
faulty.
2-1
\Inconnection
with
pads
a)
When
touching
the
pads,
a
certain
group
of
pads
do
not
produce
a
signal.
b)
When
touching
the
pads,
no
pads
produce
a
signal.
Se
2.2
\n
connection
with
indicators
a)
Ata
certain
digit,
all
or
some
segments
do
not
light
up.
b)
At
a
certain
digit,
brightness
is
low.
c)
Only
one
indicator
does
not
light
up.
d)
The
corresponding
segments
of
all
digits
do
not
light
up;
or
they
continue
to
light
up.
e)
Wrong
figure
appears.
f)
Acertain
group
of
indicators
do
not
light
up.
.
g)
The
figure
of
all
digits
flicker.
2-3
Other
possible
troubles
caused
by
defective
contro}
unit.
a)
Buzzer
does
not
sound
or
continues
to
sound.
|
b)
Clock
does
not
operate
properly.
c)
Cooking
is
not
possible.
a
NM
KEY
UNIT
TEST
if
the
display
fails
to
clear
when
the
STOP
pad
is
depressed,
first
verify
the
flat
ribbon
cable
is
@
marking
good
contact,
verity
that
the
door
sensing
switch
(siop
switch)
operates
properly;
that
is
ihe
contacts
are
closed
when
the
door
is
closed
and
open
when
the
door
is
open.
If
the
door
:
sensing
switch
(stop
switch)
is
good,
disconnecct
the
flat
ribbon
cable
that
connecis
the
key
unit
©
to
the
control
unit
and
make
sure
the
door
sensing
switch
is
closed
(either
close
the
door
or
short
the
door
sensing
switch
connecter).
Use
the
Key
unit
matrix
indicated
on
the
contro!
panel
schematic
and
place
a
jumper
wire
between
the
pins
that
correspond
to
the
STOP
pad
marking
R-771
-
18

TEST PROCEDURES (CONT'D)
a
PROCEDURE :
LETTER COMPONENT TEST
M TOUCH CONTROL PANEL ASSEMBLY TEST
The
touch
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.
inthis
service
manual,
the
touch
control
panel
assembly
is
divided
into
two
units,
Control
Unit
and
Key
and
Jog
Unit,
and
also
the
control
unit
is
divided
into
two
units,
CPU
unit
and
Power
unit,
and
troubleshooting
by
replacement
is
described
according
to
the
symptoms
indicated.
1.
Key
and
Jog
Unit
Note
:
Check
key
and
Jog
unit
wire
harness
connection
before
replacement.
The
following
symptoms
indicate
a
defective
key
unit.
Replace
the
key
and
Jog
unit,
a)
When
touching
the
pads,
a
certain
pad
produces
no
signal
at
all.
b)
When
touching
a
number
pad,
two
figures
or
more
are
displayed.
c)
When
touching
the
pads,
sometimes
a
pad
produces
no
signal.
2.
Control
Panel
The
following
symptoms
indicate
a
defective
conirol
unit.
Before
replacing
the
control
unit.
perform
the
key
and
Jog
unit
test
(Procedure
N)
to
determine
if
control
unit
is
faulty.
2-1
In
connection
with
pads
|
a)
When
touching
the
pads,
a
certain
group
of
pads
do
not
produce
a
signal.
b)
When
touching
the
pads,
no
pads
produce
a
signal.
!
2-2
In
connection
with
indicators
3
a) At
a
certain
digit,
all
or
some
segments
do
not
light
up.
|
b) At
a
certain
digit,
brightness
is
low.
¢)
Only
one
indicator
does
not
light
up.
d)
The
corresponding
segmenis
of
all
digits
do
not
light
up;
or
they
continue
to
light
up.
€) Wrong
figure
appears.
}
Acertain
group
of
indicators
do
not
light
up.
g) The
figure
of
all
digits
flicker.
2-3
Other
possible
troubles
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.
d)
Proper
temperature
measurement
is
not
obtained.
re
N
‘
KEY AND JOG UNIT TEST
If
the
display
fails
to
clear
when
the
STOP
pad
(tact
switch
SW1
3)
is
depressed,
first
verify
the
wire
harness
is
marking
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.
lf
the
door
sensing
switch
(stop
switch)
is
good,
disconnecct
the
wire
harness
that
connects
the
key
and
jog
unit
to
the
control
unit
and
make
sure
the
door
sensing
switch
is
closed
(either
close
the
door
or
short
the
door
sensing
switch
connecter).
Use
the
Key
and
jog
unit
matrix
indicated
on
the
control
panel
schematic
and
place
a
jumper
wire
between
the
pins
that
correspond
to
the
STOP
pad
(tact
switch
SW13)
marking
momentary
contact.
If
the
control
unit
responds
by
clearing
with
a
beep
the
key
and
jog
unit
is
faulty
and
must
be
replaced.
If
the
control
unit
does
not
respond,
it
is
a
faulty
and
must
be
replaced.
If
a
specific
pad
does
not
respond,
the
above
method
may
be
used
(after
clearing
the
control
unit)
to
determine
if
the
control
unit
or
key
and
jog
pad
is
at
fault.
CARRY OUT 4R CHECKS.
R-771 - 19

TEST
PROCEDURES
(CONT'D)
I
ce
ae
Ee
PROCEDURE
LETTER
ae
O
RELAY
TEST
CARRY
OUT
3D
CHECKS.
COMPONENT
TEST
.
6
Remove
the
outer
case
and
check
voltage
between
Pin
Nos.
1
and
3
of
the
4
pin
connector
(E)
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.
convection
cooking
operation
or
grill
operation.
DC.
voltage
indicated
..........
Defective
relay.
DC.
voltage
not
indicated
....
Check
diode
which
is
connected
to
the
relay
coil.
If
diode
is
good,
contro!
unit
is
defective.
OPERATIONAL
VOLTAGE
CONNECTED
COMPONENTS
Approx.
18.0V
D.C.
-Oven
lamp
/
Turntable
motor
Approx.
18.0V
D.C.
High
voltage
transformer
Approx.
24.0V
D.C.
Grill
heating
element
(Top
grill)
|
]
Approx,
24.0V
D.C.
Bottom
heating
element
npprox
240V0..
|
_Fanmowr
=
| RELAY SYMBOL
CARRY
OUT
48
CHECKS.
P
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
afine
foil
pattern
added
to
the
input
circuit
®
onthe
PWB,
this
foil
pattern
acts
as
a
fuse.
Ifthe
foil
pattern
is
open,
follow
the
troubleshooting
guide
given
below
for
repair.
Problem:
POWER
ON,
indicator
does
not
fight
up.
CARRY
OUT
3D
CHECKS.
STEPS[___
OCCURANCE
GRUSE
OR
CORRECTION
6
rated
AC
voltage
Is
not
present
at
eck
supply
voltage
and
oven
power
cord.
Power
terminal
of
CPU
connector
(CN-A).
@
fated
AC
voltage
Is
present
at
primary
Ow
vollage
transformer
or
secondary
circuit
detective.
re
side
of
low
voltage
transformer.
Check
and
repair.
Only
pattern
at
"a"
Is
broken.
hsert
jumper
wire
Ji
and
solder.
|
|
(CARRY
OUT
3D
CHECKS
BEFORE
REPAIR)
d
Patiemn
at
a”
and
b"
are
broken.
nsert
the
coil
A
OUSYAZz
between
“c"
and
“a
(CARRY
OUT
3D
CHECKS
BEFORE
REPAIR)
NOTE:
*At
the
time
of
these
repairs,
make
a
lee
rs
om
visual
inspection
ofthe
varistor
for
burn-
Res
ix
ing
damage
and
examine
the
trans-
former
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.
R-771 - 20