Sharp R-4P58 User manual

R-4P58(B)
R-4P58(W)
R-4P56(BK)
R-dP58(W)N
R-4P58(W)F
SHARP.
SERVICE
MANUAL
$7601 R4P58EHW
MICROWAVE
OVEN
WITH
GRILL
AND
BOTTOM
HEATER
moves
R-4P58(B)
R-4P58(W)
R-4P58(BK)
R-4P58(W)N
R-4P58(W)F
a
ce
a
ea
ee
ree
ee
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
CAUTION, MICROWAVE RADIATION
WARNING
SERVICING
PRODUCT SPECIFICATIONS
GENERAL INFORMATION
APPEARANCE VIEW
OPERATION SEQUENCE
FUNCTION
OF
IMPORTANT
COMPONENTS
TROUBLESHOOTING
GUIDE
TEST PROCEDURE
TOUCH CONTROL PANEL ASSEMBLY
COMPONENT
REPLACEMENT
AND
ADJUSTMENT
PROCEDURE
MICROWAVE MEASUREMENT
TEST DATA AT A GLANGE
WIRING DIAGRAM
PICTORIAL DIAGRAM
CONTROL PANEL CIRCUIT
PRINTED WIRING BOARD
PARTS LIST
a
SHARP
CORPORATION

R-4P58(B}
R-4P58(W)}
R-4P58(BK)
R-4P58(W)N
R-4P58(W)F
CAUTION
MICROWAVE
RADIATION
Personne!
should
not
be
exposed
to
the
microwave
energy
which
may
radiate
from
the
magnetron
or
other
microwave
generating
devices
if
it
is
improperly
used
or
connected.
All
input
and
output
microwave
connections,
waveguides,
flanges
and
gaskets
must
be
secured.
Never
operate
the
device
without
a
microwave
energy
absorbing
load
attached.
Never
look
into
an
open
waveguide
or
antenna
while
the
device
is
energized.
VARNING
MICKROVAGSSTRALING
Personal
far
inte
utsAttas
for
mikrovagsenergi
som
kan
ustrala
fran
magnetronen
eller
andre
mikrovagsalstrande
anordningar
om
dessa
ar
felanslutna
éller
anvands
pa
fel
sat.
Alla
in-och
utgangsanslutningar
fér
mikrovagor,
vagledare,
flansar
och
packningar
maste
vara
fast
ansiutna.
Mikrovagsgeneratorn
far
inte
arbeta
utan
att
absorberande
belastning
4r
ansluten.
Titta
aldrig
in
i
én
éppen
vagledare
eller
antenn
nar
mikrovagsgeneratorn
ar
pakopplad
eller
laddad.
VAROITUS
MIKROAALTOSATELYA
Kayttaja
ei
saa
joutua
alttiiksi
mikroaaltoenergialle,
jota
voi
sateilla
magnetronista
tai
muusta
mikroaaltoja
kehittavasta
laitteesta,
jos
sita
kaytetaan
tai
jos
se
kytketaan
vaarin.
Kaikkien
mikroaaltoliitantéjen
seka
sydttd-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
MIKROB@LGESTRALING
Personell
ma
ikke
utsettes
for
mikrobelge-energi
som
kan
utstales
fra
magnetronen
eller
andre
mikrobelge-generende
dejer
dersom
apparatet
feilbetjenes
eller
blir
feiltikoplet.
Alle
inn-og
ut-tilkoplinger
i
forbindelse
med
mikrobelge-stralingen,
balgeledere,
flenser
og
tetningsringer/pakninger
ma
festes
ordentlig.
Aldri
bruk
apparatet
med
mindre
en
mikrobalge-absorberende
last
er
plassert
|
ovnsrommet.
Aldri
se
direkte
inn
i
en
Apen
balgeleder
eller
antenne
imens
apparatet
er
stremfgrende.
ADVARSEL
————_________—-WIKROBOLGEBESTRALING-—»--
--
Man
bar
ikke
udsaeite
sig
for
mikrobelgebestraling
fra
magnetronen
eller
andre
mikrobelgefrembringende
anordninger,
hvilket
kan
ske
hvis
apparatet
er
forkert
tilsluttet
eller
bruges
forkert.
Alle
mikrobalgeindgange
og-udgange,
balgeledere,
flanger
09
teatningsstrimler
mA
veere
forsvarligt
udfort.
—
Anvend
aldrig
ovnen
uden
en
mikrobglgesabsorberende
anordning.
Se
aldrig
ind
i
en
aben
balgeleder
eller
antenne,
mens
ovnen
er
i
brug.

SERVICE
MANUAL
|
SHARP
MICROWAVE
OVEN
WITH
GRILL
AND
BOTTOM
HEATER
R-4P58(W)/
R-4P58(B)/
R-4P58(BK)
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
The
parts
marked
"*"
are
usedin
voltage
more
than
250V.
(Parts
List)
Anm:
Delar
market
med
"*"
har
en
spanning
dverstigande
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
meerket
med
stjerne
benyttes
med
hgjere
spesnding
end
250
volt.
WARNING
Never
operate
the
oven
uniil
the
following
points
are
ensured.
(A)
The
door
is
tightly
closed.
(B)
The
door
brackets
and
hinges
are
not
defective.
(C) The door packing is not damaged.
(D) The door is not deformed or warped.
(E}
There
is
not
any
other
visible
damage
with
the
oven.
Servicing
and
repair
work
must
be
carried
out
only
by
trained
service
engineers.
Removal
of
the
outer
wrap
gives
access
to
potential
above
250V.
All
the
parts
marked
"A"
on
the
parts
list
may
cause
undue
microwave
exposure,
by
themselves,
or
when
they
are
dam-
aged,
loosened
or
removed.
Never
operate
the
Grill
and/
or
Bottom
heater
with
the
oven
outer
cabinet
removed.
(Because
air
flow
is
eliminated,
and
the
excess
heat
generated
on
adjacent
componenis).
It
can
cause
permanent
damage
or
fire.
SHARP CORPORATION
‘OSAKA, JAPAN
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R-4 P53 a}
R-4P58(B X
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SERVICING
result in electrocution.
REMEMBER
TO
CHECK
3D
4) 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
then
short-circuit
the
connection
of
the
high-
voltage
capacitor
(thatis,
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,
inthis
event
carry
out
8D
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,
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
valien.
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
weer
tot
stand
te
brengen
nadat
de
buitenmante!
verwijderd
is.
Herhaal
dan
de
bovengenoemde
3
stappen
en
haal
de
alectrische
draden
uit
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.
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
valtage
harness.
Magnetronovens
bevaiten
circuits
die
een
zeer
hoge
spannin
volgende
onderdelen
kan
elektrocutie
tot
gevolg
hebben.
Hoogspanningscondensator,
hoogspanningstransformator,
magnetron,
hoogspanningsgelijkrichter,
hoogspannings
2)
Plaats
de
buitenmantel
weer
om
het
toestel
heen
(kabinet).
-gopcontactisyehaaid:Somsishetnedigemdestroomioevoer
—-——Wanneer
alle
reparatie
s
zijn
uitgevoerd
en
de
oven
weer
in
elkaar
is
gezet,
moet
de
het
magnetronverioyent
Worden
a
i
REMEMBER
TO
CHECK
4R
1)
Reconnect
all
jeads
removed
from
components
during
testing.
2)
Replace
the
outer
case
(cabinet).
3) Reconnect the supply.
A)
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
setthe
microwave
timer
for
two
(2)
minutes.
When
the
iwo
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
anc
a
microwave
leakage
test
carried
out.
g
en
stroom
kunnen
voortbrengen.
Contact
met
de
VERGEET
DE
VOLGENDE
4
STAPPEN
NIET
4)
Sluit
de
draden
weer
aan
diezijn
losgehaald
voor
de
test.
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
draaitafe!
van
de
oven,
sluit
de
deur,
zet
de
oven
op
HIGH
en
steltdeklok
van
de
magnetron
in
op
twee
(2)
minuten.
Wanneer
de
twee
minuten
voorbij
zijn
(klok
staat
op
nul),
coniroleert
u
voorzichtig
of
het
water
heet
is.
Indien
het
water
nog
steeds
koud
is,
herhaalt
u
de
allereerste
drie
stappen
en
controleer
nogmaais
de
aansluitingen
naar
de
geteste
onderdelen.
gecontroleerd
en
moet
worden
geco
ntroleerd
of
er
geen
microgolflekkage
is.

R-4P58{B
&
Los
hornos
de
microondas
contienen
circuitos
eléctricos
capaces
de
producir
voltajes
de
alta
tensién
y
descargas
eléctricas.
Para
evitar
el
riesgo
de
electrocucién,
absténgase
de
tocar
los
siguientes
componentes:
condensador
de
alta
tension,
transformador
de
alta
tensidn,
magnetrén,
dispositivo
del
rectificador
de
alta
tensién
y
arnés
de
alta
tension.
RECUERDE
LA
COMPROBACION
3D
RECUERDE
LA
COMPROBACION
4C
1)
Desconecte
la
alimentacién.
,
2)
Deje
la
puerta
abierta
y
calzada.
| 3) Descargue el condensadcor de alto voltaje.
1) Conecte todos los componentes desconectados de los
componentes durante la prueba.
2) Coloque Ja carcasa exterior (cabina).
3) Conecte la alimentacion.
|
ead
sie
ee
URE
enone
Se
4)
Compruebe
todas
sus
funciones
despues
de
poner
en
El
condensador
de
alto
voltaje
permanece
cargado
uncs
marcha
el
horno.
60 segundos después de haber apagado el horno. Espere
60 segundos y luego ponga en cortocircuito la conexién del
condensador de alto voltaje (esto es, del conductor de
conexién del rectificador de alto voltaje) al chasis con un
destornillador de mango aislado.
Los harnos de microondas no deben funcionar vacios. Para
comprobar la presencia de energia de microondas dentro de
una cavidad, coloque una taza de agua frfa en el plato giratorio
del horno, cierre la puerta y ponga !a 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, efectue las comprobaciones 3D y vuelvaa
examinar las conexiones de los componentes que han sido
probados.
Se recomienda encarecidamente que siempre que sea
posible ia localizacién de fallos se realice con la alimentacion
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 desconecie los conductores de! primario del
transformador de alimentacién. Asegtrese de que esios
conductores permanezcan aisiados de otros componentes y
del chasis dei horno. (Use cinta aislante si es necesario).
Cuando termine la prueba efecttie las comprobaciones 3D y
reconecte los conductores al primario del transformador de
alimentacion.
Cuando haya terminado la intervencién en el equipo y el harno
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 spAnningar och stroémmar.
Kontakt med féljande komponenter kan leda till dédsfall:
Hégspanningskondensator,
transformator,
magnetron,
hogspannings
likriktare,
hégspannings
kablage.
KOM
IHAG
ATT
KONTROLLERA
3
STEG
KOM
IHAG
ATT
KONTROLLERA
4
STEG
1)
Koppla
fran
str6mkallan.
1)
Anslut
alla
ledningar
som
anvants
vid
testning
2)
Oppna
dérren
pa
glant.
2)
SAtt
tillbaka
ytterhdjjet.
3)
Ladda
ur
hégspanningskondensatorn.
3)
Anslut
stromkallan
pa
nytt.
—
4)
S&tt
pa
ugnen.
Kontrollera
alla
funktioner.
VARNING
FOR
LADDNINGEN
|
HOGSPANNINGSKONDENSATORN
Mikrovagsugnar
far
inte
anvandas
tomma.
Kontrollera
Hégspanningskondensatorn
ar
laddad
|
60
sekunder
efter
mikrovagsstralningen
i
olika
delar
av
ugnen
genom
att
placera
det
atl
ugnen
stangts
av.
Vanta
60
sekunder
och
korislut
en
kopp
med
kallt
vatten
pA
ugnens
tallrik,
stang
dérren,
stall
sedan
kondensatoms
anslutning
(dvs
anslutningen
till
in
HIGH
och
stall
in
2
minuter
pA
timern.
Nartva
minuter
har
gatt
hégspanningslikriktaren)
till
chassiet
med
hjalp
av en
isolerad
(timem
visar
0)
kontrollerar
du
om
vattnet
ar
varmt.
Om
vattnet
skruvmejsel.
fortfarande
4r
kallt
utfér
Du
3
steg
kontroller
och kontrollerar
anslutningama
till
varje
enskild
komponent
pa
nytt.
Sharp rekommenderar att felsékning sker med strommen
frankopplad. Ibland kan det var nédvandigt att koppla pa
strommen efter det att héljet avlagsnats, utfor da 3 Steg
kontrollen och koppla sedan fran ledarna till transformatorns
primarsida. Se till att ledarna 4r isolerade fr4n andra
komponenier och chassiet. (Anvand isoleringsband om det
behévs). Nar Du testat fardigt utfér Du 3 Steg kontrollen och
ansluter ledningarna till transformatorns primarsida igen.
Nar all service 4r klar och ugnen ihopskruvad skail ugnens
uteffekt och eventuellt mikrovagslackage kontrolleras.

R-4P5H(B
R-4P58
R-4P5. i.
C1.)
|
fornia
microande
contengeno
un
circuito
eletirice
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
alta tensione.
TRE
OPERAZIONI
IMPORTANTI
PER
QUATTRO
VERIFICHE
IMPORTANTI
DA
NON
INCOMINCIARE
DIMENTICARE
1)
Scollegare
|'alimentazione
elettrica.
1)
Ricollegare
tutti
i
conduttori
staccati
dai
vari
componenti
2)
Verificare
che
la
porta
sia
bloccata
in
posizione
durante
l'intervento.
aperta.
2)
Rimontare
la
scatola
esterna.
3)
Scaricare
il
condensatore
ad
alta
tensione.
3)
Ripristinare
l'alimentazione
elettrica.
A)
Rimettere
in
funzione
il
forno.
Controllare
tutte
le
funzioni.
ATTENZIONE
AL
CONDENSATORE
AD
ALTA
TENSIONE:
PUO
ESSERE
CARICO
1
fornia
microonde
non
devono
mai
funzionare
a
vuoto.
Per
li
condensatore
ad
alta
tensione
rimane
carico
per
circa
|
-
verificare
la
presenza
di
energia
da
microonde
all'interno
60
secondi
dopo
lo
spegnimento
del
forno.
Occorre
quindi
di
una
cavita,
mettere
una
tazza
di
acqua
fredda
sul
piatto
spettare
60
secondi
prima
di
cortocircuitare,
utilizzando
rotante
del
forno,
chiudere
la
porta,
regolare
la
potenza
su
un
cacciavite
con
impugnatura
isolata,
il
collegamento
HIGH
ed
impostate
ii
temporizzatore
su
due
(2)
minuti.
del
condensatore
ad
alta
tensione
(cioe
del
conduttore
Trascorsi
i
due
minuti
(temporizzatore
a
zero),
controllare
di
collegamento
dei
raddrizzatore
ad
alta
tensione)
sul
accuratamente
che
ora
l'acqua
sia
calda.
Se
l'acqua
@
telaio
del
forno.
timasta
fredda,
eseguire
i
tre
controlli
iniziali
e
verificare
nuovamente
i
collegamenti
del
componente
in
questione.
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
Dopo
aver
portato
a
termine
le
operazioni
di
manutenzione
l'apparecchio
dopo
aver
rimosso
la
scatola
esterna.
In
e
rimontato
il
forno,
@
necessario
controllare
la
potenza
delle
questo
caso
eseguire
i
tre
controlli
sopra
citati
e
quindi
microonde
emesse
ed
eseguire
un
test
per
verificare
che
scollegare
i
connettori
dal
primario
del
trasformatore.
non
vi
sia
alcuna
dispersione.
Assicurarsi
che
tali
connettori
non
vengano
a
contatto
con
altri
componenti,
ne
con
il
telaio
del
forno
{fare
uso,
5e
necessario,
di
nasiro
isolante).
Al
termine
dell'intervento,
eseguire
nuovamente
i
tre
controlli
e
ricollegare
i
conduttori
al primario del trasformatore.
m™\
|
Bs
tt
ane Lae

ae,
€)
PRODUCT
DESCRIPTION
SPECIFICATION
©
rem
dCSS™S™S™~CCCC*éESGRIPTIN'
Power
Requirements
230
Voits
50 Hertz
Single phase, 3 wire earthed
Power
Consumption
Microwave
cooking
1.55
kW
Approx.
7.3
A
Top
Grill
mode
1.25kW
Approx.5.4A
Griii
cooking
Botton
Heater
mode
C.B5
KW
Approx.
3.7
A
Top
and
Bottom
mode
2.05kW
Approx.9.5A
;
Micro
and
Top
Grill
2.8kKW
Approx.
12.7A
Dual
cooking
Micro
and
Bottom
Heater
2.35
kW
Approx.
11A
Power
Output
900
W
nominal
of
RE
microwave
energy
(measured
by
method
of
IEC
709)
Operating
fequency
2450
MHz
Grill
heating
element
Power
Output
(Top
Grill}
}_
1200
W
(600
W
x
2)
1
Bottom
heating
element
Power
Output]
800
W
.
Case
Dimensions
520
mm
309
mm
including
foot
436
mm
Cooking
Cavity
Dimensions
349
mm
:
189
mm
357
mm
Turntable diameter
Controt Complement
Touch Control System
Clock
(1:00
-
12:59
or
0:00
-
23:593)
/
Timer
(0
-
90
minutes)
Microwave
Power
for
Variable
Cooking
Repetition Rate;
TOO
Me
sccivistesoracichiaatavaiiwece
Full
power
throughout
the
cooking
time
10%
ccascolencensuascenédaveeteveeserednratatbnesvers
approx.
70%
of
FULL
Power
B5)90G
-cvsuitwsunangosavaneterneiasstaustdecobunenieiecre
approx.
50%
of
FULL
Power
BOG
cacsebixcanbelfincctendesgetaanenenovanssdcaivens
approx.
30%
of
FULL
Power
OG:
iceiacuiaausschsinchsoecesrescutesaenssiavannas
approx.
10%
of
FULL
Power
LESS
(~)/MORE
(4)
buttons,
LANGUAGE
button
INFORMATION
button,
SNACK
bution
PIZZA
button,
AUTO
COOK/DEFROST
button
MICROWAVE
power
button
DUAL
COOKING
button,
GRILL
button
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

APPEARANCE
VIEW
OVEN
. Control panel
. Oven lamp
. Grill heating element (Top Grill)
. Door opening button
. Waveguide cover
. Oven cavity
. Turntable motor shait .
. Grill heating element
| (Bottom Heater)
9. Door seals and sealing surfaces
OnNonhwh
10.Ventilation openings
11.Outer cabinet
High rack
12.Power
supply
cord
en
Ie
Turntable Turntable
heater motor shaft
DIGITAL
DISPLAY
AND
INDICATORS
1.
GRILL
(bottom
heater)
indicator.
2. MICROWAVE indicator
(&)Microwave cooking indicator
‘x’ Microwave defrosting indicator
. GRILL (top grill) indicator.
. CLOCK indicator.
. LESS /MORE indicator.
. Microwave power level indicator
. INFORMATION indicator
. Cook indicator
o~ md Om &
!
During
the
cooking,
the
indicator
will
light
up.
9. Kg indicator.
10.TIME indicator
OPERATING BUTTONS
11.LESS (~)/MORE (4) buttons
12.LANGUAGE button
13. INFORMATION button
14.SNACK button
{5.PIZZA buiton
16.AUTO COOK button
17.AUTO DEFROST button
18.MICROWAVE power button
19,.DUAL COOKING button
20.GRILL button
21.STOP button
22.MINUTE PLUS button
23.START button
——~— 94, CLOCK setting button
25. TIME/WEIGHT knob
.
Ensure
that
the
bottom
heater
is
in
the
lowest
position
as
shown
in
the
figure.
As
it
is
possible
to
move
it
up
and
down
to
help
with
cleaning.
.
Place
the
turntable
support
over
the
turntable
motor
shait
on
the
floor
of
the
cavity.
.
Then
place
the
turntable
on
to
the
turntable
sup-
port.
Oo-N ®
11
14
16

«)
OPERATION SEQUENCE
OFF CONDITION
Closing
the
door
activates
the
primary
latch
swlich
andthe
stop
switch.
IMPORTANT: "
When
the
oven
door
is
closed,
the
contacts
COM-NC
of
the
monitor
switch
must
be
open.
When
the
micro-
wave
oven
is
plugged
ina
wall
outlet
(230V
/
50H7z),
the
line
voltage
is
supplied
to
the
noise
filter
and
the
control
unit.
Figure O-1 on page 29
1.
The
oven
display
will
flash
"PRESS
STOP"
in
6
lan-
quage.
2.
Press
the
STOP
button.
The
oven
display
will
flash
"SELECT LANGUAGE" in 6 language.
3. 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.
4. 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.
Set
the
hours
by
rotating
the
TIME/WEIGHT
knob.
4-3.
Changefrom
hoursto
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: ‘
1.
If
you
do
not
want
to
set
the
clock,
press
the
STOP
button
once
after
language
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.
2.
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.
MICROWAVE COOKING CONDITION
HIGH COOKING
Enter
adesiredccokingtime
by
turning
the
TIME/WEIGHT
knob
and
start
the
oven
by
pressing
START
button.
Function sequence Figure O-2 on page 30
CONNECTED COMPONENTS RELAY
Oven lamp, Turntable motor RY1
High voltage transformer RY2
Grill heating element RY3
Bottom heating element RY4
Fan motor, RY5
1.
The
line
voltage
is
supplied
to
the
primary
winding
of
the
high
voltage
transformer.
The
voltage
is
converted
to
about
3.3
volts
A.C.
output
on
the
filament
winding
and
high
voltage
of
approximately
2000
volts
A.C.
on
the
secondary
winding.
2.
The
filament
winding
voitage
(3.3
volts)
heats
the
magnetron
filament
and
the
high
voltage
(2000
volts)
is
sent
to
the
voltage
doubling
circuit,
where
itis
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,
asignal
tone
is
heard
and
the
relays
RY1
+
RY2
+
RY5
go
back
to
iheir
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,
ihe
Switthes
Gos
to
Wie
folowing
Gondition,.
wiich ontact ondition
During Oven Door
Cookin Open(No cookin
Primary
latch
Switch
COM-NO
Closed
Opened
Stop
switch
COM-NO
Closed
Opened
Monitor
Switch
COM-NO
Closed
Opened
COM-NG 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
stays
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
SW1.
6-1.
When
the
oven
door
is
opened
during
or
after
the
cycie
of
a
cooking
program,
the
primary
latch
switch
SW1
and
stop
switch
SW2
must
open
their
contacts
first.
Atter
that
the
contacts
(COM-NC)
of
the
monitor
switch
SW3
can
be
closed.
6-2.
When
the
oven
door
is
closed,
the
contacts
(COM-
NG)
of
the
monitor
switch
SW3
must
be
opened.
After
that
the
contacts
of
the
primary
latch
switch
SW11
and
the
stop
switch
SW2
are
closed.
6-3.
When
the
oven
door
is
opened
and
the
contacts
ofthe
primary
latch
switch
SW1
remain
closed,
the
fuse
F1.
T160mA
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.
100%
24 sec. ON
32 sec. ON
Approx. 100%
8 sec. OFF
SETTING
10%
Approx.
70%
18 sec. ON 14 sec. OFF
50%
Approx.
50%
12 sec. ON 20 sec. OFF
Approx. 30%
26 sec. OFF
Approx. 10%
30%
6 sec, ON
10%
Note:
The
On/Offtime
ratio
does
not
exactly
correspond
to
the
percentage
of
microwave
power,
because
approx. 3seconds are needed for heating up the
magnetron filament.

aPesaR)
5. is
GRILL COOKING CONDITION
The oven has three grill cooking condition. 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
TIME/WEIGHT knob and select the TOP GRILL mode by
pressing the GRILL button once. When the START button
is pressed, the following operations occur:
Figure O-3(a) on page 30
. The relay RY1 + RY3 + RYS are energized.
. Thenumbers ofthe digital readout startthe count down
to zero.
. Then the grill heating elements (top), turntable motor,
oven lamp and fan motor are energized.
. Now, the food is grilled by the grill heating elements.
. Upon completion of the selected cooking time, audible
signal sounds and the contacts of relays RYi + 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.
Oo nn
on &
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 pressing the GRILL button twice. When the START
button is pressed, the following operations occur:
Figure O-3(b) on page 31
. The relay BY1 + RY4 + RY5 are energized.
. Thenumbers ofthe digital readout start the count down
to zero.
. Then the bottom heating element, turntable motor,
oven lamp and fan motor are energized.
. Now, the food is grilled by the bottom heating element.
. Upon completion of the selected cooking time, audible
signal sounds and the contacts of relays RY1 + RY4
are opened, then the bottom heating elements, turnia-
ble motor and oven lamp are de-energized.
6. Therelay RY5 stays closed for five (5) minutes, and the
fan motor operates.
TOP_ AND BOTTOM MODE
In this mode, the food is cooked by both the grill heating
elements (top grill) and bottom heating element. Enter the
cooking time by rotating the TIME/WEIGHT knob and
select
the
TOP
AND
BOTTOM
mode
by
pressing
the
GRILL
button
three
times.
When
the
START
button
is
oo nm—-
o>
pressed, the following operations occur:
Figure
0-3(c)onpage31—=~*~S~S*~*~S~S~S*«S:«C
HUTA
SCF
tHSTiigitatreacioutstarttecoUNtdown
—
to
zero.
oh, .
The
relay
RY1+
RY3
+
RY4
+
RYS
are
energized.
2.
Thenumbers
ofthe
digital
readout
startthe
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
of
the
selected
cooking
time,
audible
signal
sounds
and
the
contacts
of
relays
RY1+
RYS
+
RY4 are opened, then the grill heating elements (top),
bottom heating element, turntable motor and oven
lamp are de-energized.
6. Therelay 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 made. in both modes,
the relay RY2 operates intermittently with in a 48 seconds
time base as shown below.
Power level ON time OFF time
100% A8 sec. O 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
In
this
mode,
the
foad
is
cooked
by
microwave
andthe
grill
heating
elements
(top).
Enter
the
cooking
time
by
rotating
the
TIME/WEIGHT
knob
and
select
the
MICROWAVE
AND
TOP
GRILL
mode
by
pressing
the
DUAL
cooking
button
once.
And
select
the
power
level
by
pressing
the
MICROWAVE power button. When the START button is
pressed, the following operations occur:
1. The relay RY1 + RY2 + RY3 + RYS5 are energized.
2. Thenumbers of the digital readout start the count down
to Zero.
3. The grill heating element (top), high voltage trans-
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
RY1+
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,
andthe
fan
motor
operates.
MICROWAVE
AND
BOTTOM
HEATER
MODE
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
pressing
the
DUAL
cooking
button
twice.
And
select
the
power
level
by
pressing
the
MICROWAVE
power
oution.
Whenthe
START
button
is
pressed,
the
following
operations
occur:
1.
The
relay
BY1+RY2+
RY4
+
RY5
are
energized.
3, Thebottom heating element, high voitage 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. Upon completion of the selected cooking time, audible
signal sounds and the contacts of relays RY13.RY2 +
RY4 are opened, then the bottom heating elements,
high voltage transformer, turntable motor and oven
lamp are de-energized.
as
“yi
,
3
a
era

aoe
8.
The
relay
BY5
stays
closed
for
five
(5)
minutes,
and
the
fan
motor
operates.
SNACK/
PIZZA
COOKING
SNACK/PIZZA
automatically
works
out
the
correct
cook-
ing
mode
and
time
for
cooking.
Choose
menu
and
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.
Choose
menu
and
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.
Choose
menu
and
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.
LIMITATIONS
OF
POWER
OUTPUT
IN
MANUAL
OPERATION
After
the
same
cooking
mode
is
carried
out
for
more
than
the
specified
cooking
time,
the
power
output
is
automati-
cally
reduced
by
turning
the
control
relays
on
and
‘off
intermittently,
as
shown
in
the
table
below.
This
is
to
protect
the
oven
door
against
temperature
rising.
Specified
cocking
|
Limited
power
Cooking
mode
|
time
(minutes
output
(%
seconds
Top ail
Top grill and
Bottom
heater_|
15
(Bottom)
5] Micro. + Top |_ 20 (Micro.)
P| aril heater
Microwaves
|
20(Mioro)
|
70.
|
48
|
\bottom
heater
[15
(Heater)
=
{
50.
a8
NOTE:
4.
In
case
of
Automatic
operations,
the
limitations
of
cower
output
are
not
carried
out.
2.
Incase
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
count
from
the
point
when
the
cooking
modeis
changed.
5.
lf
the
cooking
mode
has
the
power
level
display,
the
power
level
is
also
displayed
when
the
limitations
of
power
output
are
carried
out.
FUNCTION
OF
IMPORTANT
COMPONENTS
DOOR
OPEN
MECHANISM
The
door
can
be
opened
by
pushing
the
open
button
on
the
contro!
panel.
When
the
open
button
is
pushed,
the
open
lever
is
moved
upward,
operating
the
latch
head.
The
latch
head
is
moved
upward
and
released
from
the
latch
hook.
Now,
the
door
can
be
opened.
LATCH HOOK
MONITOR SWITCH
PRIMARY
LATCH SWITCH
Figure
D-1.
Door
Open
Mechanism
PRIMARY
LATCH
SWITCH
SW1
AND
STOP
SWITCH
SW2
4.
When
the
oven
door
is
closed,
the
contacts
(GOM-NO)
of
each
switch
must
be
closed.
.
2.
When
the
oven
door
is
opened,
the
contacts
(COM-
NO)
of
each
switch
must
be
opened.
MONITOR
SWITCH
SW3
4.
When
the
coor
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
the
coniacts
(CONM-NQ)
of
the
primary
latch
switch
SW1
fail
to
open,
the
fuse
Fi
7T160mA
blows
immediately
after
closing
the
con-
tacts
(COM-NC)
of
the
monitor
switch
SWS.
CAUTION:
BEFORE
REPLACING
A
BLOWN
FUSE
T160mA
TEST
THE
PRIMARY
LATCH
SWITCH
SW1,
MONITOR
SWITCH
SW3
AND
MONITOR
RESISTOR
(MOUNTED
NOISEFILTER)
FOR
PROPER
OPERATION.
(REFER
TO
CHAPTER
“TEST
PROCE-
DURE’).
FUSE F1T160mA
The
fuse
Fi
blows
when
the
primary
latch
switch
SW4
remains
closed
with
the
oven
door
open
and
when
the
contacts
(COM-NG)
of
monitor
switch
SWS
closes.
SPECIAL FUSE F2 15A
If
the
wire
harness
or
electrical
components
are
short-

——_: - os
circuited,
this
fuse
E2
blows
to
prevent
an
electric
shock
of
fire
hazard.
FUSE E3 F8A 250V
1.
Ifthe
wire
harness
or
electrical
components
are
short-
circuited,
this
fuse
F3
blows
to
prevent
an
electric
shock
of
fire
hazard.
2.
The
fuse
F3
also
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
F3
F8A
when
the
high
voltage
rectifier
Is
shorted.
ASYMMETRIC
RECTIFIER
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
F3
F8A.)
1.
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
voitage
doubler
circuit.
3. D2 of the rectifier is shorted.
4,
The
large
electric
currents
flow
through
the
high
voit-
age
winding
of
the
high
voliage
transformer.
5.
The
large
electric
currents
beyond
8A
flow
through
the
primary
winding
of
the
high
voltage
transformer.
6.
The
fuse
F3
blows
by
the
large
electric
currents.
7.
The
power
supply
to
the
high
voltage
transformer
is
cut
off.
THERMAL CUT-OUT TC4 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
[C1
will
open
and line voltages to the high voltage transformer will be cut
off
and the
operation
of
the
magnetron
will
bestopped.
The
thermal cut-out will cut back in at 95°C.
THERMAL CUT-OUT TG2 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
control
unit.
Under
the
normai
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
io
shut
down.
The
thermal
cut-out
will
cut
back
in
at
120°C.
TURNTABLE MOTOR TTM
The turntable motor drives the turntable rojler assembly to
rotate the turntable.
FAN MOTOR EM
The
fan
motor
drives
ablade
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)
GH1
The grill heating element GH71 is located on the top of the
oven
cavity
assembly.
The
grill
heating
element
GH1
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,
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
proce-
dure
letter
which
will
be
found
in
the
“Test
Procedure”
section.
IMPORTANT: If the oven becomes inoperative because
of a blown fuse F1 (Ti60mA) in the pri-
mary latch switch ~ monitor switch - moni-
tor resistor circuit, check the primary latch
switch, monitor switch and monitor resis-
tor (mounted on noise filter) before replac-
ing the fuse Fi (T160mA).
ity

TEST
PROCEDURE
|AIBIC
DIEIEIEIFIFIGH
|
[ulk|kiuiL|
||
||
iMjiolololololrint
°C
)
POSSIBLE CAUSE
AND
DEFECTIVE PARTS
GH VOLTAGE GAPACITOR
iSE T160mA (F1)
GRILL HEATING ELEMENT S(TOP)
|__| BOTTOM HEATING ELEMENT
FCIL PATTERN ON P.W.B.
THERMAL CUT-OUT 125°C
TURNTABLE MOTOR
KE Y UNIT
FAN MOTOR
| | RELAY RY4
TY RELAY RY2 || RELAY RY3
P| RELAY RY4
|_| RELAY RY5 a
a;
PROBLEM
CONDITION
Fuse F2 15A blows when power
cord is plugged into wall outlet.
=
oO
ra
ke
WW
Zz
O
x
2
Fuse 1160MA blows when the f
| | POWER SUPPLY CORD
| E TC UGH CONTROL PANEL
Ot |_| OVEN LAMP OR SOCKET
|_| THERMAL CUT-OUT 150
|
a os FUSE 15A (F2
| | FUSE F8A (F3)
cil
ALT
HE aE
HE
~ | Ot — MIS-ADJUSTMENT OF SWITCHES
[| SHV. RECTIFIER ASSEMBLY aes ee
| C |_| PRIMARY LATCH SWITCH | © |_| MONITOR SWITCH
|_| © | SHORTED WIRE HARNESS
O [|_| OPENED WIRE HARNESS
Rom rae is:
door is opened.
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 wall outlet. :
Oven does not start when the
START button 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.
e
Cy
e
(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
OO
C)
down
before
end
of cooking
cycle.
Oven seems to be operating but lit-
tle or no heat is produced in oven
load.
MICROWAVE
COOKING
CONDITION
Oven does not cperating properly
during variable cooking condition
except 100% cooking condition.
CONDITION
Bottam heating element does eal
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 ap-
erate.
aie.
Oven goes into cook cycle but shuts
down
before
end
of
cooking
cycle.
Grill heating element (top) does op-
erate.
R-4P53a(
R-4P58(B 4
R-4P58 ;

TEST PROCEDURES
PROCEDURE
eceou COMPONENT TEST |
A MAGNETRON TEST Ni
NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL ,
WHILE THE OVEN IS IN OPERATION. ON:
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 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.
MIGROWAVE 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 7085, 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 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 Sy
temperature of the water with V(ml) rises AT (°C) during this microwave heating period, the calorie of
the water is V x AT.
The formula ts as follows;
Pxt/4.187=VxAT P(W)=4.187xVxAT/t
Our condition for water load is as follows:
Room temperature Power supply Voltage Rated voitage
Water load Initial temperature
Heating time é \.
P=90xAT ©
Measuring condition:
1. Container
The water container must be a cylindrical borosilicate glass vessel having a maximum material
thickness of 83mm 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 the test.
3, Temperature of the water 22
The initial temperature of the water is (10+2)°C. ©
4. Select theinitial 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 thermometer must be scaled by 0.1°C at minimum and be an accurate
thermameter.
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.)
Therefore total heating time = 50 sec.
oo. ipasuring-methed:
1. Measure the initial temperature of the water before the water is added to the vessel.
(Example: The initial temperature T1 = 11°C)
Add 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 waier rises by a value A T of ny
(1042) K.
. Stir the water to equalize temperature throughout the vessel. ey
. Measure the final water temperature. (Example: The final temperature T2 = 21°C) eo
. Calculate the microwave power output P in watts from above formula.
peviteencet nines katt
aN
“NOM

TEST PROCEDURES (CONT'D)
PROCEDURE
oy
LETTER
|
COMPONENT
TEST
initial temperature T1=11°C
Temperature after (47 + 3) =
neg Temperature difference Cold-Warm AT1=10C
Measured output power
The equation is “P = 90 x AT”
JUDGMENT: The measured output power should be at Jeast = 15 % of the rated output power.
CAUTION: 1°C CORRESPONDS TO 90 WATTS. REPEAT MEASUREMENT IF THE POWER IS
INSUFFICIENT.
wy
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 3D CHECKS.
Disconnect the leads to the primary winding of the high voltage transformer. Disconnect the filament
and secondary winding connections from the rest of the HV circuitry. Using an ohmmeter, set on alow
range, it is possible to check the continuity of all three winding. The following readings should be
obtained:-
8. PAMEFY WINGO :scisesusdcveasacdvonressnureds approximately 1.9 Q
De SECONCSLY WINDING sccsstncpetnecccrersiccsrees approximately 96 Q
Ce PIANIST WIIGING oussinnvsresnieteuraisenseebtisvvesoenaaa less than 1 Q
lf the readings obtained are not stated as above, then the high voltage transformer is probably faulty
and should be replaced.
CARRY OUT 4R CHECKS.
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 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 kQ in the other direction.
CARRY OUT 4R CHECKS.
ASYMMETRIC
RECTIFIER
TEST
ASYMMETRIC
RECTIFIER |
CARRY OUT 3D CHECKS. C/ HIGH VOLTAGE RECTIFIER
9
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 jeads and noie this second reading. If an open circuit is indicated
in both direction then the asymmetric rectifier is good. lf 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.
7
i Spe eR
| 13

0 reer oo
PROCEDURE
LETTER
TEST PROCEDURES (CONT'D)
COMPONENT TEST
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, BE-
CAUSE OTHERWISE AN INFINITE RESISTANCE MIGHT BE SHOWN IN BOTH DIREC-
TIONS.
HIGH VOLTAGE CAPACITOR TEST
CARRY OUT 3D CHECKS.
. Isolate the high voltage capacitor from the circuit.
. Continuity check must be carried out with measuring instrument which is set to the highest
resistance range.
. Anormal capacitor shows continuity for a short time (kick) and then a resistance of about 10MQ
after it has been charged.
. A short-circuited capacitor shows continuity all the time.
. An open capacitor constantly shows a resistance about 10 MQ because of its internal 1OMQ
resistance.
F. 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.
If incorrect reading are obtained, the high voltage capacitor must be replaced.
GARRY OUT 4R CHECKS.
SWITCH TEST
CARRY OUT 8D CHECKS.
Isolate the switch to be tested and using an ohmmeter check between the terminals as described in
the following table.
moO O}O WOOF
Table: Terminal Connection of Switch
Plunger Operation COM to NO COM to NC COM; Common terminal,
NO; Normally open terminal
NC; Normally close terminal
lf incorrect readings are obtained, make the necessary switch adjustment or replace the switch.
CARRY OUT 4R CHECKS.
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 in the below.
Table: Therma] Cut-out Test
Temperature of "ON" Temperature of "OFF" | Indication of ohmmeter
Parts Name condition (closed circuit). | condition (open circuit). | (When roomtemperature
(°C) (°C) is approx. 20°C.)
Thermal cut-out 125°C | Cuts back in at 95°C. Above 125°C Closed circuit
Thermal cut-out 150°C | Cuts back in at 120°C. Above 150°C Closed circuit
An open circuit thermal cut-out TC1 (MG) indicates that the magnetron has overheated, this may be
due to resistricted ventilation, cooling fan failure or a fault condition within the magnetron or HV. circuit.
An open circuit thermal cut-out TC2 (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.
CARRY OUT 4R GHECKS.
14

TEST PROCEDURES (CONT'D)
PROCEDURE
.
_
LETTER
COMPONENT
TEST
a
G
BLOWN
FUSE
15A
(F2)
—
GARRY
OUT
3D
CHECKS.
Bs
»
If
the
fuse
15A
is
blown,
there
could
be
a
shorts
or
grounds
in
electrical
parts
or
wire
harness.
Check
|
them
and
replace
the
defective
parts
or
repair
the
wire
harness.
|
CARRY
OUT
4R
CHECKS.
CAUTION:
Only
replace
fuse
15A
with
the
correct
value
replacement.
H BLOWN FUSE T160mA {F1)
CARRY OUT 3D CHECKS.
'f
the
fuse
T1GOmA
(F1)
is
blown
when
the
door
is
opened,
check
the
primary
latch
switch,
monitor
switch and monitor resistor.
ifthe
fuse
T160mA
(F1)
is
blown
by
incorrect
door
switching
replace
the
defective
switch(es)
and
the
fuse
T160mA
(Fi).
CARRY OUT 4R CHECKS.
CAUTION:
Only
replace
fuse
with
the
correct
value
replacement.
l BLOWN FUSE F8A {F3)
CARRY OUT 3D CHECKS.
Ifthe
fuse
F8A
(F3)
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
be
occurred
due
to
short
or
ground
in
H.V.
rectifier,
magnetron,
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.
J NOISE FILTER TEST
CARRY OUT 3D CHECKS.
Disconnect
the
leads
from
the
terminals
of
noise
filter.
Using
an
ohmmeter,
check
between
the
terminals
as
described
in
the
following
table.
[Between
terminal
Nand
WHITE
|
Shortecirouit_
[Between
terminalLandRED
|
Shortoirouit_
If
incorrect
readings
are
absorbed,
replace
the
noise
filter
unit.
CARRY
OUT
4R
CHECKS.
K MOTOR WINDING TEST
CARRY OUT 3D CHECKS.
Disconnect
the
leads
from
the
motor.
Using
an
ohmmeter,
check
the
resistance
between
the
two
terminals
as
described
in
the
table
below.
Table: Resistance of Motor
[Motors
——s—‘(izdTsSS™C~™~*~“‘SC@RRA@SFiStNCO@
Fan
otor—___
|
___
Approximately
250.6
Turntable
motor
Approximately
15.5
kQ
If
incorrect
readings
are
obtained,
replace
the
motor.
CARRY
OUT
4R
CHECKS.
15

A-AP58
R-4PS(5K)
A-4P5
A-4PSEWIF
PROCEDURE
LETTER
L
TEST PROCEDURES (CONT'D)
COMPONENT TEST
GRILL HEATING ELEMENT (TOP} AND BOTTOM HEATING ELEMENT TEST
CARRY OUT 3D CHECKS.
Before carrying out the fallowing tests make sure the heating element is cool completely.
1. Resistance of heating element.
Disconnect the wire leads to the heating elementio be tested. Using ohmmeter with low resistance
range. Check the resistance across the terminals of the heating element as described in the
foliowing table.
Table: Resistance of heating element
Grill heating element (top) Approximately 22.5 2 x 2 = 45 Q
Bottom heating element Approximately 66 Q -
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 - 100MQ insulation tester. The insulation
resistance should be more than 10 MQ in the cold start.
lf the results of above test 1 and/or 2 are out of above specifications, the heating element is probably
faulty and should be replaced.
CARRY OUT 4R CHECKS.
I H CONTROL PANEL ASSEMBLY TEST
The touch contro! 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 chmmeter.
In this 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.
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.
c) When touching the pads, sometimes a pad produces no signal.
2. Control Panel
The following symptoms indicate a defective coniro! unit. Before replacing the control unit, perform
the key unit test (Procedure N) to determine if control unit is faulty.
2-1 In connection with pads
@) 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
a) At acertain digit, all or some segments do not light up.
b) At acertain 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.
€) 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 control unit.
a) Buzzer does not sound or continues to sound.
b) Clock does not operate properly.
eam ee pe re ere a meh ratte AE Re ES Fon F
“c) Cooking is not possible.
KEY UNIT TEST
lf the display fails to clear when the STOP pad is depressed, first verify the flat ribbon 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. Ifthe door sensing switch (stop switch)
is good, disconnect the flat ribbon cable that connects the key unit to the control unit and make sure
ihe door sensing switch is closed (either close the door or short the door sensing switch connecter).
Use the Key unit matrix indicated on the control panel schematic and place a jumper wire between the
pins that correspond to the STOP pad marking momentary contact. If the control unit responds by
16

TEST PROCEDURES (CONT'D)
PROCEDURE é;
LETTER | COMPONENT TEST
clearing with a beep the key unit is fauity 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 pad is at fault.
CARRY OUT 4R CHECKS.
KEY UNIT
O RELAY TEST
ay CARRY OUT 3D CHECKS.
Remove the outer case and check voltage between Pin Nos. 7 and 3 of the4 pin connector {A) onthe
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,
cS control unit is defective.
CARRY OUT 4R CHECKS.
P PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING
BOARD (PWB) OPEN
To protect the electronic circuits, this model is provided with a fine foil pattern added to the input circuit
on the PWB, this foil pattern acts as a fuse. If the foil pattern is open, follow the troubleshooting guide
given below for repair.
Problem: POWER ON, indicator does not light up.
CARRY OUT 3D CHECKS.
The rated Ne voltage is noi present at Check supply voliage and oven power cord.
SS ae
tg rated AC voltage is present at — Low voltage Eeusionner or secondary circuit defective.
;
Only pattern at "a" is broken. “Insert jumper wire J1 and solder.
(CARRY OUT 3D CHECKS BEFORE REPAIR)
4 Pattern ai "a" and "b" are broken. "Insert the coil RCILF2003YAZZ between “c" and "d".
(CARRY OUT 3D CHECKS BEFORE REPAIR)
is
oe

TEST PROCEDURES (CONT'D)
SOOO
OE
Eee
SSS
ees
eee
PROCEDURE
LETTER
NOTE:
*At
the
time
of
these
repairs,
make
a
visual
inspection
of
the
varistor
for
burning
damage
and
examine
the
transformer
with
tester
for
the
presence
of
layer
short
circuit
(check
primary coil resistance).
if any abnormal condition is detected, re-
place the defective parts.
CARRY OUT 4R CHECKS.
COMPONENT TEST
TOUCH
CONTROL
PANEL
ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
The
touch
control
section
consists
of
the
following
units
as
shown
in
the
touch
control
panel
circuit.
(1) Key Unit
(2) Control Unit
The
principal
functions
of
these
units
and
signals
commu-
nicated
among
them
are
explained
below.
Key Unit
The
key
unit
is
composed
of
a
matrix,
signals
generated
in
the
LSI
are
sent
to
the
key
unit
through
P23
-
P27.
When
a
key
pad
is
touched,
a
signal
is
completed
through
the
key
unit
and
passed
back
to
the
LSI
through
P74
-
P77
to
perform
the
function
that
was
requested.
Control Unit
Control
unit
consists
of
LSI,
power
source
circuit,
synchro-
nizing
signal
circuit,
ACL
circuit,
buzzer
circuit,
tempera-
ture
measurement
circuit,
indicator
circuit,
encoder
circuit,
and
back
light
circuit.
1) LSI
This
LSI
controls
the
key
strobe
signal,
relay
driving
signal for oven function and indicator signal.
2) Power Source Circuit
This
circuit
generates
voltage
necessary
in
the
control
unit.
Symbol Voltage
VC -5.2V
Application
LSKIC1)
18
3) Synchronizing Signal Circuit
The
power
source
synchronizing
signal
is
available
in
order
to
compose
a
basic
standard
time
in
the
clock
circuit. It accompanies a very small error because it
works on commercial frequency.
4) ACL
A
circuit
to
generate
a
signals
which
resets
the
LSI
to
the initial state when power is supplied.
5) Buzzer Circuit
The
buzzer
is
responsive
to
signals
from
the
LSI
to
emit
audible
sounds
(key
touch
sound
and
completion
sound).
eel
6
eet
Door Sensing Switch (Stop Switch)
A
switch
to
"tell"
the
LSI
if
the
door
is
open
or
closed.
7) Relay Circuit
To
drive
the
magnetron,
heating
element,
fan
motor,
turntable motor and light the oven lamp.
8) Encoder
The
encoder
converts
the
signal
generated
by
LS!
into
the
pulse
signal,
and
the
pulse
signal
is
returned
to
the
LSI.
AL fo tap ew
9) Back Light Circuit
A
circuit
to
drive
the
back
light
(Light
emitting
diodes
LD1 - LDS).
10) indicator Circuit
This
circuit
consists
of
4-digits,
30-segments
and
3-
common
electrodes
using
a
Liquid
Crystal
Display.