Goldstar ER-686ZD User manual

GoldStar
ArtB
-
MICROWAVE
OVEN
SERVICC
MANUAL
CAUTION
BEFOR=
SERVICING
THE
UNIT,
READ
THE
“SAFETY
PRECAUTIONS”
IN
THIS
MANUAL.
MODEL:
ER-6862D

SAFETY PRECAUTIONS
WARNING TO SERVICE TECHNICIANS
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
A) Do not operate or allow the oven to be operated with the door open.
B) Make the following safety checks on all ovens to be serviced before activating the magnetron or other
microwave source, and make repairs as necessary; (1) Interlock operation, (2) Proper door closing, (3) Seal
and sealing surfaces (arcing, wear, and other damage), (4) Damage to or loosening of hinges and latches;
(5) Evidence of dropping or abuse.
C) Before turning on microwave power for any service test or inspection within the microwave generating com-
partments,
check
the
magnetron,
wave
guide
or
transmission
line,
and
cavily
for
ptoper
alignment,
integri-
ty, and connections.
0) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation
and
transmission
systems
shall
be
repaired,
replaced,
or
adjusted
by
procedures
described
in
this
manuat
before the oven is released to the owner,
E) A microwave leakage check shouid be performed on each oven prior to release to the owner.
See reer ea
toy
-
Proper
operation
of
the
microwave
oven
requires
that
the
magnetron
be
assembled
to
the
wave
guide
and
cavity.
Never
operate
the
magnetron
untess
it
is
properly
installed.
-
Bo
sure
that
tho
magnetron
gaskot
is
properly
installed
around
the
dome
of
the
tube
whenever
installing
the
magnetron,
:
- Routine service safety procedures should be exercisod at all times,
-
Untrained
personnel
should
not.attempt
service
without
a
thorough
review
of
the
test
procedures
and
safely
in-
formation
contained
in
this
manual,
Read this manual carelully. Failure to adhere to of observe the information in this Manual may resull in exposing
yoursell to tha Microwave Energy normally contained within the oven cavity.
TABLE OF CONTENTS
CAUTIONS ic eigecadscanci coe iien we guashiddatebaweshous otedniadvinav) adigdy upleedeeng aa aidetataciavbeainadeanats satiny ine, *4
INSTALLATION PRECAUTIONS wisi iccecetetcnscerentesceeenes dvindalads Totastion geD agendas aga youneMaacdeetiag, Cady SAE GEES )
SPECIFICATIONS. seis: ccscisisicscoas ccodesscsuvavacsseenus csvceedud cusudacenieyeeassaresbeevesdeqecescviegesesteassnayveosuudsvoscanpasederscueaia ter 7
OPERATING INSTRUCTIONS oo... ccescscce cee ceeneeneerereecs PRIA in Scie has : Heatinsie, «ase 8
ASFEATURES® cx ccstesscacisncverdecasacevsaat padices coavects niceeas deuce genes codnn Fudd eshe Coates seguda ypmaeetaT ote doseaen ares 8
B.:CONTROL,. PANEL: sein scctclats ecg eeieotens sede ee leaae 9
C. OPERATING PROCEDURE oo... eesretteeees iyi eem. _ weabad stats Mites peienadsnccevet sen ais 410
SCHEMATIC DIAGRAM ooo. ccc etttteeeterennees c. tHe, >Reabin sat gio usearaabecearias deaeae tay 2)
CIRCUIT DESCRIPTION
COMPONENT TEST PROCEDURE ...vvvsesccccssen eve S et ne een
EXPLODED VIEW AND PARTS LIST vossscs ccssssssssenesee i Pustatiatch tebe Meriden ti cated eet 43-52
INTROS TIONS ids cistern, feats, mates snackorsnh eas Basten eUlnnatia aap Masta seed tes alte 43
1. DOOR PARTS vieccssssssssssesseeon See atacae tei altnmchinenh sean nh aimee cele nate Real Se 44
BACON TOL PANEL PARTS osu say2he cuales ryt Pon setae ssbb canons bbl snprtetse lA ak day hebedel 45
FO COMPONENT VIEW OR PCB siissiaintlt iuliintencamtica nami hna na ama decama ileal hea, 46
23. SCHEMATIC DIAGRAM FOR CIRCUIT BOARD .......... An aere h i he Attar es cal 47
BA. CIACUIT BOARD PARTG LIST wc sistauty vices tan ca oie ater ain haclld etn nasi att aaecaats 48
3. OVEN INTERIOR PARTS ..cccccccccsssssssssssessessesvessssensessseensesseues vee ree 49
4. BASE PLATE PARTS a 50
5. CABINET PARTS o..csssssscssssssssssesseeees ey Thoth ope anes bec Rc rea ae Lise aedee BEB
¢ REPLACEMENT PARTS LIST .u...cccccecccceetsecseeetesenteees fo tees bed dteagucs Be aaa . 52

CAUTIONS
EEE
ETT
Yu
Ta
aaaeemmmanminammnmuamemnmmemesmemmnnemennnnneneenns
CAUTIONS
TO
BE
OBSERVED
WHEN
TROUBLESHOOTING
Unlike
many
other
appliances,
the
microwave
oven
is
high
voltage,
high
current
equipment.
Though
it
is
free
.
from
danger
in
ordinary
use,
extreme
care
should
be
taken.during
repair.
:
CAUTION:
REMOVE
YOUR
WATCH
WHEN
WORKING
CLOSE
TO
OR
REPLACING
THE
MAGNETRON.
Warning
about
the
électric
charge
in
the
voltage
capacitor.
For
about
30
seconds
after
the
oven
stops,
an
electric
charge
remains
in
the
high voltage
capacitor
when
replacing
or
checking
parts,
short
between
oven
chassis
and
the
"4"
terminal
of
high
voltage
diode
by
using
a
properly:
insulated
jumper
wire.
WARNING:
THERE
IS
HIGH
VOLTAGE
PRESENT,
WITH
HIGH
CURRENT
CAPABILITIES
IN
THE
CIR-
CUITS
OF
THE
HIGH
VOLTAGE
TRANSFORMER
SECONDARY
AND
FILAMENT
TRANSFORMER
SECON-
DARY,
IT
IS
EXTREMELY
DANGEROUS
TO
WORK
ON
OR
NEAR
THESE
CIRCUITS
WITH
THE
OVEN
ENERGIZED.
‘
WARNING:
NEVER
TOUCH
ANY
CIRCUIT
WIRING
WITH
YOU
HAND
OR
INSULATED
TOOL
DURING
OPERATION.
DO
NOT
MEASURE
ANY
VOLTAGE
IN
THE
HIGH
VOLTAGE
CIRCUIT
INCLUDING
FILAMENT
VOLTAGE
OF
MAGNETRON.
WARNING:
DO
NOT
TOUCH
ANY
PART
OF
THE
CONTROL
CIRCUIT,
A
RESULTING
STATIC
ELEC-
TRIC
DISCHARGE
MAY
DAMAGE
THIS
CONTROL
PANEL.
MICROWAVE
RADIATION:
PERSONNEL
SHOULD
NOT
BE
EXPOSED
TO
THE
MICROWAVE
ENERGY
WHICH
MAY
RADIATE
FROM
THE
MAGNETRON
OR
OTHER
MICROWAVE
GENERATING
DEVICE
IF
IT
IS
IMPROPERLY
USED
OR
CONNECTED.
ALL
INPUT
AND
OUTPUT
MIGROWAVF
GON-
NECTIONS,
WAVEGUIDES,
FLANGES,
AND
GASKETS
MUST
BE
SECURE.
NEVER
OPERATE
THE
DEVICE
WITHOUT
A
MICROWAVE
ENERGY
ABSORBING
LOAD
ATTACHED.
NEVER
LOOK
INTO
AN
OPEN
|
WAVEGUIDE
OR
ANTENNA
WHILE
THE
DEVICE
IS
ENERGIZED.
:
(ees Sa ee
2 ee on,
INSTALLATION PRECAUTIONS
A. Plug the power supply cord into a 220V AC, 50Hz, single-phase power source.
8. Use the microwave oven in an ambient temperature less than 104°F (40°C).
C. Avoid placing the unit in a location where there is direct heat or splashing water.
D. Place the microwave oven on a sturdy and flat surface.
E. Place the unit as far away as possible from TV, radio. etc., to prevent interference.
F. Avoid placing objects on the top cover so as not to obstruct air flow ventilation.
G. Keep more than 10cm (4 inches) from the back plate to wail.
CAUTION
This unit is equipped with a 3-prong plug for your safety if the wall outlet is a grounded 3-hole type the unit will
be grounded automatically.
a. EARTHING INSTRUCTIONS
For personal safety, this appliance must be earthed. In the event of an electrical short circuit, earthing reduces
the risk of electric shock by providing an escape wire for the electric current. Thise appliance is equipped with
a cord having an earthing wire with an earthing plug, which must be plugged into an individual socket that is proper-
ly installed and earthed.
| WARNIN Geuse of the unearthed plug can result in a risk of electric shock. Do not, under any cir-
cumstances. Cul or remove the third earth prong from the power cord.
ek ered ee a eee
The conseumer should have it checked by a qualified electrician or serviceman if the earthing instructions are not
complelely understood, or if doubt exists as to whether the appliance is properly earthed
WARNING-THIS APPLIANCE MUST BE EARTHED
IMPORTANT
The wites in this mains leads are coloured in accordance with the tollowing code !
Green-and-yellow : Earth ° '
Blue : Noutrat
Brown : Live
As the colours of the wires in the mains lead of this appliance inay Nol correspond wilh the coloured markings
identifying the terminals in your plug, proceed as follows:
The wire which is coloured green-and-yellow must be connecied to the terminal in the plug which is marked
with the letter E or by the earth symbol + or coloured green or green-and-yellow. :
The wire which is coloured blue must be connected to the terminal which is marked with the letter N or col-
oured black. 3 Bee geting ates soe Someta Sal a8 8,
The wire which is coloured brown must be connected to the terminal which is marked with the letter Lo
oured red. * . é . a " a ae i “tee a 5s aes fae gn
ft CO}.
pe
RAL
R
ITC
OO
EEE
AOE
IRE
IEEE
EER
LEE
EEE
nn
REE
EGE
CRIT
SES
Be
Ce:
Rens
SSS
Re
noo SEE

b.
CIRCUITS
For
safety
purposes
this
oven
must
be
plugged
into
a
6.3
Amp
circuit.
No
other
electric
al
appliances
or
lighting
circuits
should
be
on
this
line.
Vin
doubt,
consull
a
licensed
electrician.
c.
VOLTAGE
WARNING
The
voltage
used
at
the
wall
receptacie
must
be
the
same
as
specified
on
the
o
the
back
or
on
the
side
of
the
control
panel
of
the
oven.
Use
of
a
higher
voltage
is
in
a
tire
or
other
type
of
accident
causing
oven
damage.
Low
voltage
wi
microwave
oven
does
not
perform
normal
operation
in
accor
the
power
cord
and
then
insert
it
again.
ven
serial
plate
localed
on
dangerous
and
may
result
1
cause
slow
cooking.
in
case
your
dance
with
AC
power
source
and
voltage,
remove
e
d.
LOCATION
OF
THE
OVEN
Your
microwave
oven
can
easily
be
placed
in
your
kitchen,
family
room
ar
any
other
room
in
your
home.
Place
the
oven
ona
flat
surface
such
as
a
kitchen
counter
top
or
a
‘specially
designed
microwave
oven
cart.
Do
not
place
oven
above
a
gas
Of
electric
range.
Free
air
flow
around
the
oven
is
important.
e.
DO
NOT
BLOCK
VENTS
All
air
vents
should
be
kept
clear
during
cooking.
If
air
vents
are
covered
during
oven
operation
the
oven
may
overheat.
In
this
case
a
sensitive,
inermal
salety
device
automatically
turns
the
oven
oll.
The
oven
will
be
in-
operable
until
it
has
cooled
sutticiently.
:
____DOOR OPEN
DOOR CLOSED
SPECIFICATIONS
“7a
Rated Power Consumption bastasaSnansvivases
Microwave Output ..., uw
Frequency .......
bs mee i 2 : 2450 MHz + 50 MHz. .
eeponiatd
‘
Se
phase
220
V,
50
Hz.
earthed
Magnetron Cooling ee.
Microwave Stirring
. Forced air cooling
Safety Device
.. Turntable
Primary Interlock Switeh/S: . |
/Secondary Int ‘Swi
. Monitor Switch, irate
- Main Fuse (T 6.3 Amp). Monitor F
F use T 125A
: Magnetron Thermostat ; eon)
Open at 145°C +6°Ce
Magnetron Wastes Rie aes
Bivens ASE ay SRE pone 2M214.39F Or 2M214-69
Han Vermeer - ee 0.86 wF, 2100V AC
ar LAMP Aiveseestexeaseisediess ee ow
IMOl icsectisediesnoteiss b )
SRI aE 90
retail Dimension WW» Hox DD). Pits i ~ 43 x 13%
ae
Dimensions
(W
x
H
x
OD)
we,
eas
Fie
%
10",
es
ty
Ge
ee
ee)
aVity VOIUME ...c cece ’y.0cu.t Bete On ee ae
shits “panleednevoia teers “1.0cu. ht .
;
" Specifications are subject to.change without notice.
SWITCH CHART
INTERLOCK
tg
__
INTERLOGK
MONITOR
SWATCH
|
SWITCH
SWITCH
CONDITION
sce
OM
Sod
ND.
OPEN
CLOSED ____ CLOSED
Ref. COM: COMMON
NO: NORMAL OPEN
NC: NORMAL CLOSED

OPERATING
INSTRUCTIONS
A. FEATURES
co
'*
TEMP
PROBE
OVEN
LIGHT
SOCKET
SAFETY DOOR LOCK SiGitis
DISPLAY Willie ce
(suds
AIR
VENTS
|
ROVAT
Is
Hn
WINDOW -DOOR SCREEN
** TEMPERATURE PROBE
SELECTOR WUEFON
; x tae)
nn
ne
aetna
ememnennanennenemeame
teen
eieenemetmee
meee
nme
nae
B. CONTROL PANEL
Indicator Lights-AUTO START,
AUTO WEIGHT DEFROST,
TIME, TEMP, AUTO TIME,
AUTO TEMP, RECIPE, POWER
lights indicate which cooking
operation is being used.
Olspiay Window-Used lo show
Time of day.
* Cooking ime
¢ Cooking power level
* Cooking temperature
* Italso function as count down
tumert of temperature indicator
/ duning cooking.
Recipe Entry Recali-Used to
preset lavonte cooking programs
for use at a later date by touching
RECIPEW, And itis also used to
call up a cooking program stored
in the memory sequentially
Power Level-Used in selecting
Auto
Weight
Detrost-Used
to
cooking
power
level
Uehrost with three pads and fo
select weight with NUMBER pad
Temp-Used in selecting the =~
desired food temperature
automuancally - Timer/Weight/Temp: Used to
ahically.
select (he ime, weight, emp
Auto Temp- Used in selecting
cooking temperature
automatically.
Start-Starts
the
oven.
Auto Time-Used to select
programmed lime recipe.
Door Open Button
Clear-Clears
all
entries
except
-—~
time
of
day.
Seton
. Postian

rte
cnet
tte
Lo
moder.
Lad
Sia
3
dpe
gene
taareenne
es
eae
atm
een
tar
tn
ene
Re
u
8
'
“Buin
GutY00I
UNROYD
ayy
10]
‘ainjesodwa
10
BWI}
UOSOYd
B
10,
jO40|
JOMOG
Judo;
BIC
‘iad
pay)
ep
punss
vu
vp
aunt Nig Agjag lososd @ tn Buiyauy pus AjeonnuoinE 5ulyo09 oy! Ounseys Aq auop oq utd Bu(x009 RIS qyny oinyesodusny 40 oust] UasOYd B 40] [AQ] JaMOd UTE9d B le EBEIS OU U! 4OOd O} LOAD O4)) 1
3
IM009
FOVIS-FIYHL
'S
ONINOOD
LUVIS
OLNY
‘9
ON
ne ener
3. “MULTI-POWER” COOKING
CSOFERATING
PROCERURE
Many
foods
need
slower
cooking
(at
less
than
full
power)
in
order
to
give
you
the
bes(
results.
In
addition
to
*
FULL
1,
SETTING
CLOCK
POWER
(HIGH)”’
there
are
four
multipower
settings.
The
cookbook
tells
yeu
which
power
Setting
is
recommended
for
the food
being
cacked.
= a aT
STEP. KEY PAD i DISPLAY WINDOW:
EXAMPLE: The present time 1s 12:34.
KEY PAD.
DISPLAY ¥ WINDOW
1, Touch ‘Clear’. | je) : a
ey Or So
i _—s
1. Plug the power cord into an electrical
outlet.
2. Touch pad for desired power level | oa
(Warm). ‘ 3s o>
Lore:
|
|
|
2, Touch “Clock” Hl oo
3.
Rotate
the
TimerMWeight/Temnp
Knob
with
.
,
rok
i
no
it
Out
(setting
position)
to
indicate
correct
.
in
is
hour
(12
hours)
Yoo
:
; Ose {
3. Rotate the TimerWeight/Temp knob with :
=. |
:
.
S
;
TT
Chen
it out (selling position) to set the desired : rn ; . tt ie
cooking time (1 minutes) ; :
: i
{
ay
orn
'
: 5 : ' ' mrt pat : rE Phen
4.
Touch
“Clock
|
£
cle)
i
2
dee
4,
Touch
"Start".
'e:
PeLt
ui
'y
Oa’e ee ee ee Og oP aaa ma
5. Rotate the TimerWeight/lemp knob with ' pe es; ie
2 y wt : ' al Lda ad of level. F ect it by touching the right pad alter step 2.
it
Out
(Setting
position)
to
indicate
correct
,
OC)
{
[i
2
2424
If
you
touch
a
wrong
pad
of
level.
you
can
correct
it
by
touching
ight
p
step
minutes
(34
m-rutes)
2
‘
i OH*a hia, ‘
6.
Touche
‘Clock
,
e
H
Pe
iGet
Pee
oe
on we ee ETE. GUIDE FOR MULTI POWEB - ‘
Note:
The
Timer
is
a
24
hour
CLOCK("20:30"
correspouds
to
8:30
PM)
The
“MULTI
POWER
"
feature
lets
you
can
cook
wt
the
best
power
level
for
the
food
being
Cooked.
Cooking
direc:
tions can be found in the cookbook
2, FULL-POWER (HIGH) COOKING
POWER POWER
SETTING PERCENTAGE
EXAMPLE Hf yore want fo cook fresh fish on full power for 5 minutes 30 seconds EXAMPLES
“step” b.. uoeetarase 5 aoe ae a dere yoteetherw wate gate
* Sottening cream cheese.
5 (WARM :
| ) * Keeping casserokes and main dishes warm.
. Touch Clear”.
ena el eae 2 es
* Thawing meat, poultry and seafood.
.
Touch
“High”.
i
(LOW)
*
Completing
the
cooking
cycle
of
casseroles,
stews
and
some
sauces.
. poring: small quantities of most foods.
. Rotate the TimerWeight/Temp knob with it ret) ieee daabieustey Ge Spee Seti tee tee Me ey
out (Setting position }to set the desired cooking
time,
cy (MEDIUM)
. Coen sprambled egges.
. Cooking tender cuts of meal.
* Cooking fish, vegetables and most casseroles.
Preheating the browning dish.
* Boiling water.
* Thickening some sauces.
. Touch "Start".
10) HIGH(FULL 100%
POWER)
Note
To stir tood duting cooking open the oven door; stir or turn-the food.
Close the oven door and touch start. The oven will automatically continue to count down the amount of time left
on the tmer.
~~
-H- ;

4. AUTO WEIGHT DEFROST
The microwave oven controls different output powers automatically during defrosting time programmed by setting
weight and functions (MEAT, POULTRY, FISH) of AUTO WEIGHT DEFROST functions you want to cook.
1) MEAT (Touch “Auto Weight Detrost” once for meat defrosting.)
EXAMPLE: To defrost 0.2 kg. of meats,
KEY PAD DISPLAY WINDOW
. Measure the weight of frozen food you
want to cook and place it in the oven and close
the door.
. Touch ‘Clear’.
. Touch "Auto Weight Defrost”.
. Rotate the TimerWeight/Temp knob with
it out (setting position) to set weight of frozen
food you measured (0.2 Kg)
5. Touch “Start”.
2) POULTRY (Touch “Auto Welght Defrost” twice for poultry defrosting.)
EXAMPLE: To detrost 0.7 kg. of poultry.
DISPLAY WINDOW
1. 2, Step 1 and 2 are the
same with "MEAT".
3. Touch “Auto Weight Defrost
twice.
4, Rotate the Timer/Weight/Temp knob with it
out (setting position) to set weight of frazen
food you measured (0.7 Kg)
5. Touch “Start”.
3) FISH (Touch “Auto Weight Defrost” three thmes for {lsh defrosting.)
EXAMPLE: To defrost 1.0 kq of fishes.
STEP
1. 2. Step 1 and 2 are the .
same with “MEAT”.
3. Touch “Auto Weight Defrost"
three times.
4. Rotate the TimerWeight/Temp knob with it
out (setting position) to set weight of frozen
food you measured (1.0 Kg)
5. Touch ‘Start’.
Note
1. This oven can defrost from 0.1 kg to 4.9kg
2. This oven can defrost in stage of 0.1 kg
peas,
KEY PAD DISPLAY WINDOW
aut
La 33
St te MUS na
© rie ay
siete alge sa a Sables elethcia

aanuav0dd ONILVYadO ‘(9
6. AUTO START COOKING
5,
THREE-STAGE
COOKING
ortain
powor
level
for
a
chosen
time
of
temperature
Auto
Start
cooking
can
be
done
by
starting
the
cooking
automatically
and
finishing
at
a
preset
Delay
Start
time,
This cooking allows you to set the oven to cook In one slage ala c for tha chosen cooking time.
and
then
In
a
second
and
a
third
stage
ata
ditterent
powor
level
for
a
chosen
time
or
temporature.
eal
3
KEY
PAO
DISPLAY
WINDOW
EXAMPLE:
if
you
want
to
start
«
6:30
(Current
time
of
day
is
4:30.)
STE
eepemenes
aera:
Demme
«ene
eens
.
ee
STEP KEY PAD _| DISPLAY WINDOW
1.
Touch
“Clear”.
QO
i
Pet
(jee
Od
Touch
“Auto
Start".
oat,
D0
3. ok he TinerWeighV/Temp knob with it 1 3
out ( INg POSHiON) to indicate Correct hour 16
(6 hou. .) Soe
4. Touch ‘Auto Start".
1. Touch "Clear".
2. Touch “High”.
~
A
Rotate
the
TimerWeight/Temp
knob
wilh
it
oul
(setting
position)
to
set
the
cooking
tine,
(4
minute
30
seconds)
sme
Cc na
ut “|
| 4. Touch “Medium”
+
5
Step
Sis
same
as
step
3
above.
(4
minutes
H
30
seconds)
;
|
anc
5S.
Rotete
the
lin
awWeight/lemp
knou
to
‘
S
;
Arte
Po
indicate
corect
minute.
(30
minutes
cs
\
oO
4
L{0g
'
6.
Touch
“Low”
i
J
|
:
i
7
i
6.
Touch
button
for
desired
power
level.
i
Boe
ara
Pe
|
7
Step
715
the
same
as
step
3
above.
(6
minutes)
os
(eg
a
Oa'c
8.
Touch
“Start”.
©
:
7.
Rotate
the
Time/Weight/Teimp
knob
with
il
|
a
'
=F
ren
;
|
out
(setting
position)
to
set
the
desired
cooking
Fe
ee
:
time.
(15
minutes)
Ny,
x
~
Lt
Phos
eee
want
two-stage
cooking,
push
the
start
pad
after
step
5
is
completed.
8.
Touch
‘‘Start”
{
O
Ef
Dts
,
}
Poe
en
SER
A
ae
Sn
eng
eg
en
ena
es
2,
You
can
also
use
temperature
cooking.
:
:
,
1.
Pn
SraeESOAE
SE
3
Don't
use
Temp
Probe
with
Auto
Weight
Defrost
Cooking
or
Time
Cockiing:
:
:
NOTE
1. A preset Auto Start time is Jess than 24 hours. The timer is a 24 hour clock.
("18:30 corresponds to 6:30 f’.M.)
2. Fresh food should not stand at room temperature for too tong.
.
3.
Before
the
Auto
Start
button
is
touched,
the
time
of
day
must
be
set.
;
4.
When
the
door
is
opened
and
closed
again
during
Auto
Start
operation,
‘'Strt"’
is
displayed
in
the
display
win-
dow to call Start pad. ;
5.
Auto
Start
cooking
must
always
be
used
alter
Time
of
Day
is
set
if
Time
of
Day
is
not
set
and
start
the
oven
“Err”
will
be
displayed.

Table #1
7. AUTO TIME .
STEP
; DISPLAY WINDOW
i Touch “Clear OC)
. |
Pouch) Sute Tame” i OO
i
:
d
=
Pog
Touch
Stat’
a
25:
gut
birt
Cc)
2¢€
ofthe
us
{
es
Lk
:
NOTE:
Reter
to
tabie
#1
lor
detailed
recipe
corresponding
to
each
number
which
appears
in
the
display
vi.
Jow
whenever
you
touch
the
Auto
Time
pad.
STAGE 1 ee ae
|
NO,
MENU
rower
ey
TIME
PAUSE
row
TIME
;
ae
oe
!
ne
mae
veka
i
LEVEL
|
hes
eek
2
BAKED
POTATO
100
%
|
2:10
0
100
%
|
2:10
|
3
CANNED
VEGETABLE
|
100%
|
2:00
fe) 100
%o
2:00
4 HOT DOG ' 100%» = § oso | x |
5
CHICKEN
(BONE
IN)
100
%
4
2:00
|
oO
100
%o
|
2:00
ae
COFFEE
1
400
%
2:20
x
[7
|.
Hamoucen
|
too%
|
100
|
0
100
Note:
Whenever
you
touch
the
Auto
Time
pad,
the
number
in
the
display
window
changes
trom
No.
1
to
No.
7
gradually.
Choose
the
desired
number
(desired
recipe)
for
the
best
result.
me 16-
8.
TEMPERATURE
COOKING
ON
FULL
AND
MULTI-POWER
1.
Plug
the
temperature
probe
into
the
jack
on
the
ceiling
of
the
oven.
2.
Place
the
temperature
probe
into
the
food
with
the
first
inch
of
the
sensor
into
the
center
of
the
food.
The
temperature
probe
is
ut
-d
to
judge
doneness
when
cooking
or
reheating
food.
\
Sensing
Area
(Aboul ! inch)
[ee
TER
ee
oy
|
KONE
AD
DISPLAY
WINDOW
.
|
fe)
2.
Touch
the
desired
power
level.
a’
>
same
oY
par)
tie
_
3.
Louch
"Lemp"
“Ge
“Ay
3.
Touch
Pfemp
(ers
a
3
;
;
:
Oo'c
4.
Rotate
the
Timer/Weight/!
emp
knob
with
it
rece:
i
iti
i i
CC
rw
oul
(setting
position)
to
set
-e
desired
cooking
‘
fm
Lo
“
temperature
(60°C)
k
“
; % —
co hoa
0 ”
~
y
5.
Touch
"Start".
|
CO
Ly
or
ty
NOTE
1.
Temperature
from
35°C
to
95°C
can
be
chosen
and
sel.
The display will show the ris : in food temperature.
2.
The
lowest
temperature
nun
ver
that
can
be
displayed
at
35°C.
Theretore,
even
though
food
inay
be
less
than
35°C,
the
display
will
remain
at
“Cool''
until
the
food
is
heated
to above 35°C. .
3.
If
the
temperature
probe
is
ot
plugged
into
the
jack,
display
window
will
show
“Prob”.
nn et nnn nn es conn a
me: a aS BB nia MeCN Add Hus ede een oe eS
: ene ea RS RII Cp ener Fie FOR
cont | PP Free = Gace
NAY RAN BAD: 48d ER he cena artnet med nan tanta eat ORS aae bu sy wedtaaakiobe
enn ertethy oh Be eB Nabi 7808

COOKING TEMPERATURE AND POWER LEVEL OF EACH STAGE FOR MENUS
a
| __STAGE 1
°C(*F)
NO. MENU
t BEEF
| af RAED
12 weoiumy
| 4 H BEEF
Bet 4 (WELL DONE)
} 4 HAR {
Tg Puy coonEM
ig | CHICKEN
* * } (WHOLE)
6: PORK
bP ORMIEATLOA
(Lota:
i . the
meer cece an a ne pn
1
38( 100) turn the food,
crossed And then close the
38(100) i door and toucn
Spied Start again.
381100) | If not needed,
- touch start withoul
38100) ° these procedures.
When the display
window will show
“PAUS" open the
door and stir and
BTGUY
- \9-
STAGE 2
49(120)
54(130)
60(140)
49(120)
82(180)
74(165)}
68(155)
PGhadadly
Chogoe
Ue
Geied
QUribGe
(dented
tocwpe)
lor
the
best
result
STAGE 3
Vine
never
you
touct
tie
Auto
Teing
button
the
cumber
in
the
display
window
changes
trom
No
|
to
tee eee ee =
according to the menu.
1. Plug the temperature probe into
2.
Place
the
temperature
probe
into
the
food with
t
pe
|
the jack on the ceiling of the oven.
he
2.5cm
of
the
sensor
into
the
center
of
the
food.
STEP
1. Touch "Clear!
2. Select desired number by touching
“Auto Temp”.
3. Touch “Start”.
When 1st cooking ends.
Display window will show "PAUS". and two
beep tones will sound.
4. Touch "Start" once more.
2nd stage cooking ends, two beep tones
sound and 3rd stage cooking begins.
When 3rd stage cooking ends, End" appears
in display window.
NOTE
1,
The
display
window
will
show
the
temperature
from
35°C
to
38°C
with
going
up
1°
increments.
When
over.
temperature
reaches
38°C,
two
beeps
will
sound
and
"“PAUS"
will
appear
in
the
display
window.
2.
When
the
display
window
will
show
“PAUS"',
open
the
door
and
stir
or
turn
the
food.
And then close the door and touch start again.
3. Refer to Table #2 for detailed recipe corresponding to each number which appears in the display window whenever
you touch the Auto Temp pad. ‘
Ee eel
KEY PAD
{o)
S
}
O5r
~ 18-
DISPLAY WINDOW
OTT ence A RS

10, MEMORY ENTRY
pitt Gh iehe, SEES
STEP
DISPLAY
WINDOW
KEY PAD
“Clear” e
@. Touch “High”
1. Touch
3.
Rolate
the
TimerWeight/femp
knob
wilh
it
CnyC
out
(setting
position)
to
set
the
desired
C)
od
cooking time, (1 minutes)
4. Touch ‘Memory Mecall’’,
_
1
~
§. Touch
pp
i
Toueb
Satay”
(
)
“Memory Entry”, ‘
Ce
to ot
oo
NOTE:
You
can
enter
your
own
recipes
in
the
memory
bank
of
three
blocks
by
touching
Memory
Entry
One
black
maans
one
sequential
cooking
proqrum
f@.,
combination
of
§
STAGE
1,
STAGE
2.
and
STAGE
3)
fhe
numbers
ter
memory
bank
are
12
and
3
Me
tory
Latry
butlon
1s
used.
11. MEMORY RECALL
EXAMPLE: When the | minutes. (HIGH POWER)
STEP _KEY PAD
DISPLAY WINDOW ©
1. Touch ''Clear”. é)
2. Touch "Memory Recall”,
3. Fouch
“Stan” ¢)
Note:
Memory
Recall
button
1s
used
to
recall
cooking
data
programmed
or
input
a
Proper
cooking
program
in
each memory stage.
20
CIRCUIT DESCRIPTION
¢ The low voltage transformer supplies the necessary
voltage to the mi 2m controller when power cord is
plugged in.
As the door is opened the contact of monitor switch
is closed. This switch creates the short circuit to blow
6.3A fuse during operation under abnormal condition.
(ie, should be contacts of primary switch and secon-
dary switch fail to open the circuit)
* The door latches are secured by the latch board.
WHEN COOKING POWER LEVEL AND COOKING
TIME ARE SET BY TOUCHING THE TIME COOK
AND THE POWER LEVEL PAD
* The micom controller memorizes the function you set.
¢ The time you set appears in the display window.
- ¢ Each function-indicate turns on to indicate that stage
Bane.
has been set.
WHEN TOUCHING THE START PAD
* The coil of the RELAY 2 is energized by micom
controller,
The RELAY 1 operates.
220 volts AC supplied to the high voltage transformer.
FAN motor rotates and cools the magnetron by biow-
Ing the aif (coms | from inlet of the back plate) over
the magnetro firs.
This air is also directed into oven to exhaust the vapor,
The oven light turns on.
Function indicate Bar word sharts Displaying indicate
progress function.
Cooking time starts counting down.
3.2 Volts AC is generated from the filament winding
of the high voltage transformer. This 3.2 voit is applied
to the magnetron to heat magnetron filament through
two noise supp ssion choke coils, A high voltage
2100 volts AC is generated in the secondary winding
of the high voltage transformer and this secondary
voltage is increased by action of the diode and charg-
ing of the high voltage cpapcitor. This resultant DC
voltage is then applied to the magnetron via the
filament.
The disturbance wave gencrated by the magnetron
is suppressed by the choke coils, raise filter assembly
and the magnetron shielded case, so that TV and
RADIO programs are not impaired by noise.
e
WHEN THE OVEN JN SET AT ANY POWER EXCEPT
MAX POWER LEVEL
¢ Micom controller controls the ON-OFF tire of the
RELAY 2 by the applied gate signal to vary the
average output power of microwave oven from
“POWER LOW" to “POWER HIGH".
* One complete cycle of RELAY 2 is 22 seconds.
POWER CHART
OUTPUT POWER
AGAINST
HIGH POWER
ON-OFF TIME
INDICATION OF RELAY
4122 (10%)
| 8/22 (30%)
eretebtiae o
10/22 (40%)
12/22 (50%) -
14122 (60%)
16/22 (70%) |
ie arp Saco
18/22 (80%)
ice p ew ee
20/22 (90%)
22/22 ( 100%)
WHEN THE DOOR JS OPENED DURING COOKING
Both primary switch open to cut off primary winding
voltage to the high voltage transformer.
ON-OFF Time of Relay is coupled electrically with
opening and closing of secondary. switch.
When the door is opened, secondary switch is open-
ed and when the door is closed, secondary switch is
closed.
Function indicate word stops displaying and display
stops counting down. |
Relay stops functing.
* As the door is opened, if the contact of primary switch
fail to open, the 6.3 amp fuse blows by the large cur-
rent surge caused by the monitor switch activation and
in turn this stops magnetron oscillation. (Fig. 4)
°
e
SIMPLIFIED SHORT CIRCUIT
PRIMARY SWITCH
MONITOR
SWITCH
Fig. 4
~22~-:
fete we

.
.
MAGNETRON TUBE
* The magnetron tube is the heart of the microwave
oven, It is basically a diode with the addition of a
magnetic field. The magnetron tube assembly consists
of cylindrical cathods (negative) terminal, enclosed
within a cylindrical anode (positive) terminal,
evacuated of all air, and surrounded by a permanent
magnet,
In order to create an electron flow from cathode to
anode, the cathode must be heated and a potential
dilfarence must exist between the two. This is ac-
complished by heating the cathode with 3.15 VAC
(lrom the filament winding of the high voltage
transformer), and applying a negative 4000 VDC (from
the voltage doubler circuit) to the cathode.
Onginally, the electrons would travel in a straight line
trom the cathode to the anode (see Fig. 5).
However, with the addition of a permanent magnet
surrounding the anode creating a magnetic field, the
electrons travel an orbital path between the cathode
and anode (see Fig, 6). As the electrons approach the
anode, their orbital path takes them past small reso-
nant cavities that are part of the anode. The passing
notion of the electrons induces electron current lo
oscillate in the resonant Cavities at the very high fre-
quency of 2.450 megahertz. This RF energy is then
transterred to the antenna,
TESTING MAGNETRON TUBE
ee
Disconnect power, remove
discharge the capacitor.
Remove the two leads from the magnetron terminals,
Connect the ohmmeter between one terminal of the
magnetron and the outer case of the magnetron. If the
ohmmeter reads infinity, go to below. If the ohmmeter
reads less than infinity, the magnetron is shorted.
Connect the ohmmeter across the terminals of the
magnetron. The ohmmeter should read less than one
ohm, lf ohmnieter reads over one ohm or infinity, the
tube is defective. .
the wrapper, and
janet wae eee
iAA
ELECT os
ANCE
AAC ETL
AbLER INE:
ELECTHONY
ANODE --
a 23 we
CHE WEEHOU]
/
ANVVPR A Neoish de ok
Foie
anise
A
a
EI
ck
Tg
a
en
ene
tai
A
tt
a
trates
ALEDE MELS
CAD ot
INSTALLATION AND ADJUSTMENT OF
INTERLOCK SYSTEM
Ir Oy 5 me 5a:
+ INTERLOCK MECHANISM
Tho door lock mochanism is a device which has been
specially designed to completely eliminate microwave
when the door is opened during cooking and thus to
perfectly prevent the danger resulting from the leakage
of microwave.
ae
LL
I
Priniary
Intenoct
Switch
Latch Board-t.~ u
Monitor /
Switch
aici” 4
Mounting
Screw
Secondary”
Switch
Sere eee ae
NT:
Tey
Barre
che
l
be
we
vee
Mounting Scras.
se Lateh Board
Primary.
Interlock
Switch
c
Mende.
Sy: :
voy“ Lateh Board:t
~Monitor Switch
Secondary
Saat Switch
7
4
S emanmpeaantad
7 ada
a cade Pe eR ne a ET Rn anemia arity ae te ES
ae.
BOD
nest
SOE
Mit
ype
ats
aid
Mat
amwee.
an
on
tee
tree
eran
ne
Slims
-
vs
INSTALLATION AND ADJUSTMENT OF THE LATC
BOARD ASM TO THE OVEN ASSEMBLY
* Mount the latch board to the oven assembly.
* Adjust the latch board arrow direction $0 that ove
door wil not have any play in it where closed,
Tighten the mounting screw.
Check for play in the door by pushing the door relea:
button. Door movement play should be less than 0
mm (1/64).
Do not push the door release button while makit
adjustment,
Make sure that the latch moves smoothly after adju:
ment in completed and that screws are tight.
After he adjustment, make sure by the ‘continuity te
procedure that the primary switch operates proper!
.
Fig. 7
ro Ste ulaibabecue a este

t
INTERLOCK
CONTINUITY
TEST
| ba aera eee eae ten renner tn ETO EI '
:
*
The
service
personnel
should
replace
all
of
the
monitored
safety
imerlock
switches
and
mca
ao
oven
has
been
rendered
inoperative
due
to
the
failure
of
the
monitored
salety
interlock(s).
*
Be
sure
to
connect
the
monitor
switch
after
replacement
and
to
check
interlock/monitor
cont
COMPONENTS
TEST PROCEDURE on eee att
cern settee foe: EO Sh eS
MEASURING
INSTRUMENTS
Check for continuity of
SWITCHES with an Ohin-ineter
(Wire leads removed.)
‘
Switch
! { n
| { Snead
| 1 Monitor { | te
| Po Saidten cs
\ t H
i i %
\ ‘
\ '
} Hh
\ i Sacondary | |
; : Seeditch is
1 i
WEN OTE ANGE CHEE ng
, RS eile,
Primary san [ Ss ak
aes oe
paar eg Se AAA ARGS
¢ for the ‘continuity of’switches,’
“correctly connected,
i
the switch ib Our
4 yaaa)
hs
PG eae
PRIMARY INTERLOCK (UPPER LATCH)
SWITCH TEST
~~ When.the door button is slowly depressed with the door
closed, an audible ‘click’ should be heard at the same
Pals time or successively at intervals. When the button is
“. Slowly released, the latches should activate the switches
with an audible “click”. ;
Pee if the latches do not activate the switches when the door
| 0 --ds closed, the switches should be adjusted in accordance
| with adjustment procedure.
». Isolate the primary switch by disconnecting it from lead-
. -wire, Connect the ohmmeter leads to the common (COM)
/ and normally open (NQ)} terminal of the switch, The meter
should indicate an open circuit in door open condition,
When the door is closed, the meter should indicate a
closed circuit,
| When the primary switch operation is abnormal, make
the necessary adjustment or replace the switch only with
| the same type. of switch.
SECONDARY INTERLOCK (LOWER :
SWITCH TEST
Isolate the secondary switch by disor:
lead wire. Connect the ohmmeter leads |. «!
(COM) and normally open (NO) terminal. «6+!
The meter should indicate an closed vinci. 2 ©
open condition. When door is closed. th:
indicate an closed circuit. When the yu:
operation is abnormal, make the necenn: -
or replace the switch only with tha sani
MONITOR SWITCH TEST
Isolate the monitor switch by disconne t.
wire, Connect tha otimmeter leads ta the cr.
and normally close (NC) terminals of thy.
meter should indicate closed circuit in theo
dition. When door is closed, the moter.
an open circuit.
When the monitor switch operation is at.
the same type cf switch.
NOTE: Alter repairing the door or the 2-1:
it is necessary (Je this continuily toc) &:
the oven.
orn
NECESSARY
TOOLS
AND
-
“
NECESSARY
TOOLS
:
.
NECESSARY
MEASURING
INSTRUMENTS
Tools
normally
used
for
TV
servicing
are
sufficient.
.
Abra
vee
DC,
AC-ohmmeter)
listed
below.
s
Inch
scale
fs
ee
—
:
»
Electromagnetic
radiation
monitoi
>
pee
vie
pliers
*
600
cc
glass
beaker
or
equivalent
+ Glass thermometer 100°C
:
Two
1
titer
beakers
or
equivalent
»
Cross
head
screwdriver
*
Socket
wrench
(size
Sin)
¢ Nutdriver (size 5 min}
¢ Adjustable wrench
* Soldering iron
* Solder
» Vinyl insulation lane
Polishing cloth

at
"
g.
REMOVING
THE
OUTER
CASE
(FIG.
6)
(1)
Remove
five
screws
from
the
side
section.
(2)
Remove
three
screws
from
the
rear
section.
-©
The
outcase
must
be
moved
backward
to
the
lifted
off.
*
REPLACING
THE
POWER
SUPPLY
CORD.
Remove
the
outer
case.
‘Disconnect
the
terminal
of
power
supply
cord.
Remove
the
power
supply
cord
from
the
appliance.
‘tstall:new
power
supply
cord
as
shown
in
Fig.
8.
Connect
terminals
of
power
supply
cord,
Live,
Neutral
-
and
Earth.
eee 8 @
CAUTION
MICROWAVE
RADIATION
0
NOT
BECOME
EXPOSED
TO
RADIATION
FROM
THE
MICROWAVE
GENERATOR
OR
OTHER
PARTS
CONDUCTING
MICROWAVE
‘ENERGY.
B.
REMOVING
CONTROL
PANEL
ASS’Y
(FIG.
9)
(1)
Disconnect
the
wire
leads
(from
relay
1
and
relay
2)
and
WO
connector.
(2)
Remove
the
earth
screw
securing
earth
terminal
to
the
front
plate.
(3)Remove
two
screws
securing
the
control
panel
:
to
the
front
plate.
|
(4)Remove
the
contro!
panel.
|
é
‘
tance
the
wire
leads
from
the
relay
1,
relay
2
and
VO
|.
ggnnector
VERY
CAREFULLY.
Be
sure
to
grasp
the
con-
nector,
and
not
the
wires.
DISASSEMBLY
AND
PARTS
REPLACEMENT
PROCEDURE
wcpmpger
FRONT PLATE
CONTROL
PANEL
RELAY 1
RELAY 2
EARTH SCREW
-27-
Splimnnereennepetrmeneimetenanimevnnmmnenmmasens
canna
en
tennsinte
coer
eer
cmnmgmmmnnne
a
ween
ES
OUTER CASE
SCREWS
Fig. 3
YC. REMOVING PCB ASSEMBLY (FIG. 10
nh
Sig!
ae
ae
‘
)
(1) Disconnect the wire leads from URI connector.
(2) Remove two screws securing the PCB assembly
from the control panel.
(3) Remove three screws securing the power trans
volume assembly.
(4) Remove the screws securing the tactile key
assembly from control pancl.
(5) Remove the release lever.
(6) Remove the digitron window.
(7) Separate the key membrance from the coniroi
panel.
(8) Remove the door button and bution spring.
NOTES:
1. Reverse the above steps for reassembly.
2. Do not touch any part of the circuitry on the control
circuit on the control circuit board since static elec-
tric discharge may damage the control unit.
Always touch yourself to ground while working on
this circuit to discharge any static charge accumlated
in your body.
CONTROL
PANEL
PCB
TACTILE ASSEMBLY
KEY ASSEMBLY
BUTTON
_
RELEASE
LEVER
BUTTON
SPRING
CAUTION |
WHEN REMOVING THE HIGH VOLTAGE TRANS: |
FORMER,
DIODE,
CAPACITOR
AND
MAGNETRON,
|
ALWAYS DISCHARGE THE HIGH VOLTAGE CA-
PACITOR.
D. REMOVING THE HIGH VOLTAGE
TRANSFORMER (FIG. 11)
(1) Disconnect the wire leads from H.V. transtormer
to the magnetron and H.V. capacitor.
(2) Remove two screws securing the H.V.
transtormer to the base plate.
(3) Tilt the top of the H.V. transformer forward and
lift it up.
NOTES:
1. Remove the wire leads from the H.V. transformer
VERY CAREFULLY.
2. When removing the wire leads from the parts, be
sure to grasp the connector, and not the wires.
£&. REMOVING THE HIGH VOLTAGE DIODE AND
HIGH VOLTAGE CAPACITOR (FIG. 12)
(1) Discharge the High Voltage capacitor.
(2) Disconnect the wire leads from the H.V.
capacitor.
(3) Remove fan motor and suction guide. (See page
30.)
(4) Remove one screw securing the H.V. capacitor
and diode to the base plate.
~ 28 -~
HIGH VOLTAGE
CAPACITOR
HIGH VOLTAGE
DIODE
TRANSFORMER
H.V. CAPACITOR &

NOTES
1. Remove the connector trom the H.V. capacitor
VERY CAREFULLY with fong nose pliers.
2. When removing the connector from the H.V.
. Capacitor, be sure to grasp the connector, and not
the wires.
3. Remove the diode from the H.V. capacitor VERY
CAREFULLY with long nose pliers.
F. REMOVING MAGNETRON (FIG. 13)
(1)
Disconnect
the
wire
leads
from
the
magnetron.
(2)
Remove
one
screw
(G)
to
detach
the
air
duct
from
the unit. Fig. 13).
(3)
Remove
two
screws
securing
the
section
guide.
(4)
Remove
four
machine
screws
(A,
B,
C
and
D)
securing the magnetron to the unit. (Fig. 13)
NOTES
_ 1. When removing the magnetron, make sure its dome
does not hit any adacent parts, or it may be damag-
ed. (Fig. 14)
2. When replacing the magnetron, be sure to install the
» Magnetron gasket in the correct position and be sure
that the gasket is in good condition. (Fig. 14).
‘3.
‘After
replacing
the
magnetron,
check
on
microwave
.. energy jeakage with a survey meter around the
., (magnetron.
Microwave energy must be below the limit of 5
mWicm, (With a 275 mi water lead)
~ See page 31 (MEASUREMENT WITH THE OUT-
ER CASE REMOVED)
CAUTION CHECK THE CORRECT POSITION |
MAGNETRON
PRIMARY HV. CAPACITOR
_7MGT-THERMOSTAT
!
a MAGNETRON
D0
~~ So
AIR DUCT
b____ MAGNETRON
GASKET
—~~-- MAGNETRON
a d Fig. 14
G. REMOVING THE FAN MOTOR (FIG. 15)
(1) Disconnect the wire leac:s from the fan motor
terminal.
(2) Remove two screws securing the suction guide
Asm to the magnetron.
(3) Remove one screw securing the suction guide
Asm to the back plate.
(4) Remove two screws securing the fan motor to the
back plate.
NOTE: Reverse the above ste; 3 for reassemblage.
H. REMOVING DOOR (FIG. 16)
(1) Remove two screws securing the upper hinge.
(2) To remove the door, tilt the top of the door for-
ward and lift up.
NOTES
1. After replacing the door, be sure to check that the
primary switch, monitor switch and secondary switch
operates normally. -
2. After replacing the door, check for microwave energy
leakage with a survey meter.
Microwave energy must be below the limit of
2mWiem?. (with a 275 mi water load).
1. REMOVING TURNTABLE MOTOR (FIG. 17)
{1) Remove the turntable and rotating ring.
(2) Remove the turntable shaft VERY CAREFULLY
with a slotted screwdriver. (Fig. 18)
(3) Upset the unit. :
(4) Remove one screw to detach the motor cover
from the motor bracket.
(5) Remove the wire leads from the turntable motor
CAREFULLY with long nose pliers. -
(6) Remove two screws securing the turntable motor
to the motor bracket.
NOTES
1. Remove the wire lead from the turntable motor VERY
CAREFULLY WITH long nose pliers
2. Be sure to grasp the connector, and not the wires
when removing the wires,
-30-
UPPER HINGE
(HINGE. PLATE-U) i?
Fig. 17
TURNTABLE SHAFT

ENERGY LEAKAGE
CAUTIONS
Be sure to check a microwave emission prior to ser-
“vicing the oven if the oven is operative prior to
Servicing.
f the oven operates with the door open, the service
- personnel should tell the user not to operate the oven.
The service personne! should check all surface and
:vent openings for, microwave emission testing.
Check for microwave energy leakage after every ser-
icing. The power density of the microwave radiation
: leakage emitted by the microwave oven should not ex-
ceed 2 miV/cm. sq. And always start measuring of an
unknown field to assure safely for operating person-
née! from radiation leakage.
NOTE: The standard is 5 mW/cm. sq. while in he
customer's rome. 2 mWicm. sq. stated here is manufac-
turef’s own voluntary standard for units in customer's
‘home
~” EQUIPMENT :
“"« Electromagnetic energy leakage monitor (NARDA
“81008, HOLADAY H1501)
© 600 cc glass beaker
‘e Glass thermometer 100°C or 212°F
PROCEDURE
FOR
MEASURING
MICROWAVE
—
MEASURING MICROWAVE ENERGY LEAKAGE
¢ Pour 275 + 15cc of 20 + 5°C water in a beaker which
is graduated to 600cc, and piace the beaker in the
center of the oven.
Set the energy leakage monitor to 2,450 MHz and use
it following the manufacturer's recommended test pro-
cedure to assure correct result.
When measuring the leakage, always use the 2a" -
(5 cm) spacer supplied with the probe.
Operate the oven at its maximum output.
Measure the microwave radiation using and elec-
tromagnetic radiation monitor by holding the probe
perpendicular to the surface being measured. (see
Fig. 20).
Move probe along shaded area
Probe scanning speed
less than 2.5 cm/sec
prgggseasssewaairsegs
cA
Zi 4
3 3
y 4
g 4
4 4
g 0
g 4
3 4
3 4
z 3
GIULUSSMSES a
Fig. 20
MEASUREMNT WITH THE OUTER
CASE REMOVED °
« When you replace the magnetron, measure tor
microwave energy leakage before the outer case is
installed and after all necessary components are
replaced or adjusted.
Special care should be taken in measuring the follow-
ing parts.
—Around the magnetron.
—The waveguide
WARNING: AVOID CONTACTING ANY HIGH
VOLTAGE PARTS.
-31-
MEASUREMENT WITH A FULLY
ASSEMBLED OVEN
* After all components, including the outer panels, are
fully assembled, measure for microwave energy
leakage around the door viewing window, the exhaust
opening and air inlet openings.
* Microwave energy leakage must not exceed the
values prescibed below.
NOTES:
Leakage
with
the
outer
panels
removed—less
than
5
mWicm.sq.
Leakage for a fully assembled oven (‘Before the latch
switch (primary) interrupted”) with the door in a slightly
opened position—less than 2 mW/cm.sq.
NOTE WHEN MEASURING
* Do not exceed meter full scale deflection.
* The test probe must be removed no faster tnan 1
inch/sec (2.5cm/sec) along the shaded area, otherwise
a false reading may result.
The test probe must be held with the grip poruon of
the handle.
A false reading may result if the operator's hand is
between the handie and the probe.
When testing near a corner of the door, keep the pro-
be perpendicular to the surface making sure the pro-
be horizontally along the oven surface, this may
possibly cause probe damage.
RECORD KEEPING AND NOTIFICATION
AFTER MEASUREMENT
¢
After
adjustment
and
repair
of
any
microwave
energy
interruption
or
microwave
energy
blocking
device,
record the measured values for future reference. Also
enter the information on the service invoice.
Should
the
microwave
energy
leakage
not
be
more
than
2
mWicm.sq.
after
determining
that
all
parts
are
in
good
condition,
functioning
properly
and
genuine
replacement
parts
which
are
listed
in
this
manual
have
been used.
* Atleast once a year, have the electromagnetic energy
leakage monitor checked for calibration by its
manufacturer.
°
DETERMINATION OF MEASUREMENT OF MICRO-
WAVE POWER OUTPUT
* Microwave power output measurement is made with
the
microwave
ovensupplied
at
its
rated
voltage
and
Operated at its maximum microwave power setting
with a load of (1000 +5) g of potable water.
The water is contained in a cylindrical borosilicate
glass vessel having a maximum material thickness of
3 mm and an outside diameter of approximately 190
mm.
The oven and the empty vessel are at ambient
temperature prior to the start of the test.
The initial temperature of the water is (10 +2)°C. It
is measured immediately before the water is added
to
the
vessel.
After
addition
of
the
water
to
the
vessel,
the load is immediately placed on the centre of the
shelf which is in the lowest position and the microwave
power switched on.
The time T for the temperature of the water to rise by
avalue AT of (10 +2) K is measured, where T is the
time in seconds and A T is the temperature rise. The
initial and final water temperatures are selected so
that the maximum difference between theifinal water
temperature and the ambient temperature is 5 K.
*
The
microwave
power
output
P
in
watts
is
calculated
from the following formula:
_ 4187(AT)
T1
P
is measured while the microwave generator is
operating at full power. Magnetron filament heat-up
time is not included.
The water is stirred to equalize temperature
throughout the vessel, prior to measuring the final
water temperature.
Stirring
devices
and.
measuring
instruments
are
selected
in
order
to
minimize
addition
or
removal
of
heat.
WATER LOAD
TURN TABLE
Fig. 24
-32-

- TROUBLESHOOTING GUIDE
:
When
you
get
a
complaint
from
your
customer,
evaiuate
the
complaint
carefully
before
going
to
the
customer's
!
“el,
home.
If
the
following
symptoms
apply,
please
inform
the
customer
in
the
proper
use
of
the
microwave
oven.
This
“
Gan
eliminate
an
unnecessary
call.
D>) CONDITION
REMEDY
Avoid using electrical apphances
when you use the microwave
oven
Over loaded circuit
Microwave oven plug 's not | il Insert microwave oven
inserted tightly plug securely
Low AC input voltage Use the microwave oven on
adequale line voltage
This may not be a detect. It 1s
possible that the food should be
cooked for a longer time period.
Food temperature is too low
Do not use metallic ware for
cooking except where noted
in the cook book.
Using metallic ware which
touch the oven wail
-| Sparks occurring
Ceramic ware trimmed in
: Oo not use any type of
gold or silver powder is used
cookware with metalic trimming.
1, Wrap thinner part with
aluminum fot.
Use plastic wrap or with a lid.
Stir once or twice while
cooking Soup, cocoa of milk
etc.
Inconsistent intensity of
microwave energy due to their
inherent characteristics
ee
en
CONTROL CIRCUIT TROUBLESHOOTING
Follow the procedure below to check the control circuit.
¢ Check grounding before checking for other trouble.
© Be careful of the high voltage circuit.
« When checking the continuity of the switches or transformer, disconnect one lead wire trom these parts and -
then check continuity without lurning the power source on.
¢ Do not touch any part of the circuitry on the printed circuit board, since static electric discharge may damage
the digital programmer circuit.
Always drain electrostatic energy to ground by touching a known earth ground while working on this circuit
© First operate the microwave oven toHowing the correct operating procedures.
233=
|
(TROUBLE
1)
The
following
visual
conditions
indicate
a
probable
defective
printed
circuit
board
(PCB)
|
e Incomplete segments.
-Segment missing.
~P irtial segement missing.
-Lugit flickering (NOTE: Slight Flickering Normal)
Color does not turn on, when they should.
A
distinct
change
in
the
brightness
of
one
or
more
numbers
in
display.
One
or
more
digits
in
the
display
not
lighting
when
they
should.
:
:
;
Display
indicates
a
number
different
from
one
touched.
For
example,
key
in-5
and
3
appears
in
the
dispiay.
Specific
numbers
(for
example
7
of
9)
will
not
display
when
key
pad
is
touched.
Display
does
not
count
down
with
time
cooking
or
Clock
will
not
maintain
the
time
of
day.
Display
erraticatly
jumps
in
time
while
counting
down.
Display
counts
down
noticeably
too
fast,
whole
cooking.
:
rae
;
It
does
not
beep
twice
when
it
shifts
from
stage
cooking
to
second
stage
cooking
in
the
2
stage
cooking
program.
Each
power
indicator
light
does
not
reappear
when
cooking
is
finished,
and
start
pad
is
touched.
*
Beep
sound
is
not
heard
when
correct
key
is
touched.
°
1. Nof Check the Connected Defective Replace
inpui connection * PCB : PCB
between assembly assembly -
key membrance
and printed
circuit board Loose Connect than
(PCB)
connection
tightly
j
No Connected
=
Som
nied
Everything
Defective
Replace
rogr.isimed
Replace
key
works
as
an
=
,
membrance
specitied
key
membrane
key
membrane
and operation.
Reptace
(PCB)
3. Display . .0ows
anum: or
figure erent
fram or.
touche :
Sti nave Detective
trouble (PCB)
. Errau a
grami.
when j. -SSiINg
other oads
|
play
figure
becomes
fixed
and
cannot
accept
any
input.

(TROUBLE
2)
Oven
does
not
operate
at
all;
Display
window
does
pi
cisplay
any
figures
and
no
in-
put
is
accepted.
CONDITION
ie
CHECK
[Resut
|
id
"
‘
ei
ascckia
=
Check
continuity
Continunty
fees
BES
scion
at
Le
a
ey
blows.
of
monitor
switch
Sor
chr
Switch
i Ah its
(with
door
close)
‘
Swit
See interlock
continuity test
SUSE |
on
page
25.
No
contnunty
.
,
EE
NA
Sa
eee
ee
=
~
(Replace
6.34
ruse
|
a
SWC
Parphace
(ne
pe
relay
2
7
grondtoe
cwiten
<=
Cneck continuity
primary switch
and relay 2
terminal wilh
door opened
_—_—
Both or one
continuny
Pree COMLCIS penary Switch
~7
es
wee
andor
PCB
No both caleed asseinbly
ad
Check
continuily
No
continuity
ere
Secoaetary
switen
piBeplace
pratary
of
secondary
tl
andor
relay
2
Monier
.
switch.
—
{mater
hon
SeCOb
Ary
Savile
(With
door
open)
aaa
Continuity
f
ania
FOES
|
L
=
asinitdly
aby
hily
1
_—
5
[
Disconnect
one
side
é
iste
es
Hepes.
faah
‘eof
tne
wire
leads
asia
|
Normal ‘ -
Payne voltage valle
beodestut mer
connected form the
transtormer to the
high voltage Capact-
tor and operate the
unt,
Urtdtta feet
6.3A fuse
blows again
“THepia es begs
anprete dbad
}
pee eee a
*
Refer
to
page
for
continuity
check
of
primary
and
monitor
switches
———
os
CONDITION
CHECK
RESULT
iz
CAUSE
|
Check
continuity
No
Opa
power
el
Replace
power
of
power
supply
continuity
supply
cord
Te
supply
Cond
HY
Hepes
fo
hid
Wet
a
J
REMEDY
2. Fuse does not
blow
Check continuity
of MGT
thermostat
No continuity
cord
(TROUBLE
3)
Display
shows
all
figures
set,
but
oven
does
not
start
cooking
through
progres:
fie:
and
START pad is touched.
CONDITION CHECK
Check continuity
secondary switch
with door closed
ie CAUSE
_p! Detective nw gf REpPlacs:
secondary switch secondary switch
| RESULT |
[ REMEDY
1, SETTING Time
does not count
down when
touching
START PAD
Detective cheng Reptice
~
PCB
assembly.
PCB
umbly
Loose Fs Coane t thet
cannechon mee ughtly
Check the
connection
between I/O
connector and
PCB assembly
No connected
REMEDY
{
[ ConpiTIoN | [ CHECK 1 [ RESULT | CAUSE REMEDY
2 Fan motor anc | ; smal No continurty Defective Replace i
: Sent j PCB assembly PCB assembly !
oven
iamp
do
_
ot
Relay
+
on
notturn
on
|
>
Ahter
moving
————_—__ * Lead wire from
‘Relay
1
ana
|
mes
genera
aelrctads|
i
operate
PCB
:
1
Contmuty
Faulty
contacts
Replace
|
7
|
assembly
:
—
:
of
relay
or
open
Relay | ‘
(TROUBLE 4) No microwave oscillation oven although the fan motor, oven lamp and synchronous
motor
operate
(Display
operates
properly)
:
a : :
| CONDITION [ CHECK “4 RESULT CAUSE REMEDY |
a
Noes)
Pa
At
- :
:
sale
re = .
1 Checsa comipuity
- Jamas ee
af 2 eas Apnormai Defective eS Replace ;
a Relay 2 with a ar oc a PCB assembly {PCB assebmly :
1 move wire leads j j ects eee a pres aren | ey
i
from
relay
2
ang
!
-
' ba 4
‘
operate
PCB
:
a
Normal
Open
winding
of
~~»
Replace
HV
“|
No microwave he.
oscillation
|
assembly
f
oat
high.
voltage
trans{
transtormer
ee
ne
ae
ga
i
former.
or
faulty
3
a
fe
Poilety
aan
etd
insulation
ot
[
4
.
P
mien
8 :
flament
winding
\
tod
Checa
tne
L.
--e{|
Normal
:
(Reter
to
“com.
|
ireler
to
cam.
|
i]
mat
ponent
test
i
ponent
tes1
procedure’’}
|
j
Procedure
{
|
=
aeeeromiaeae
Varner
|
Shorted
nigh
ha
ae
Replace
HV!
voltage
capacitor
|
Capactor
|
!
-
j
Faulty
magnetron
NOTE:
*
MAKE
SURE
THE
WIRE
LEADS
ARE
IN
THE
CORRECT
POSITION
‘
.
Maha
REMOVING
THE
WIRE
LEADS
FROM
THE
PARTS,
BE
SURE
TO
GRASP.
THE
CONNECTOR,
AND
NOT
THE
WIRES
;
*¢ WHEN REMOVING THE MGT BE SURE TO INSTALL THE MGT. GASKET IN THE CORRECT POSITION AND IN
GOOD
CONDITION
:
Replace
magnetron
Replace Relay 2
(TROUBLE
5)
Oven
does
not
cook
properly
when
programmed
for
power
ievel
1
through
power
level
10
(cooking
powers
operate
properly
on
full)
|
CONDITION
CHECK
RESULT
REMEDY
:
Check
the
relay
2
ae
Output
is
fuil
reter
to
eon
pe>
|
Avnormal
|
_
Detective
Replace
power
when
is
nent
test
Relay
2
Relay
2
set
lower
procedure”
power
level
See
Fig.
34
Orn A988 2,
ake Normal Defecive PCB Replace PCB
Bees assembly. assembly.

| (TROUBLE 6) Output power is low. | ;
CONDITION
CHECK
RESULT
te
CAUSE
|
|
Nisaey
Output
ts
low
cannot
key
in.
continuity
of
Check the power Lower than
source voltage 216V a
reatil
Probe
in
use
sensor
probe
Cnet
sate
ia
one
2
indicator
does
a
,
Normal
;
RR git seat fe
-+|
Normal
ile
ts
FS
4
not
light
on
|
Disconnect the
(TROUBLE
7)
Temperature
probe
is
plugged
in
and
touch
the
TEMP.
PAD
and
touch
the
POWER
LEVEL.
[
conoition
|
[
CHECK
|
RESULT
CAUSE
REMEDY
1. Temp control
Decrease in poweth abo, ol undone
source voltage canilas Chocab ete
Cneck
Defective
sensor
probe fopen)
Infinity
Replace
WD (aed
anaes
we
f
7 ‘
Repair
ihe
7
:
\
e@
i
ane
a
Detecuve
PCB
|.
.
tha
ae
|
i
Creck
Coen
erase}
row]
wire
leads
from
{
Assembly
is
Fer
i
continuity
:
ae
eee
eae
Z
red
ct
:
H
ot
testa
wire
Seapets
Se
SS
Oe
;
|
relay
2
and
ttt
fet
Se
:
|
between
Continuity
Tor
Detective
ro
Replace
|
check
on
and
otf
|
\
a
“de
2
icon
t
\
time
multrtester
z
Norrmnat
,
SeTNgOr
jac
i
cane
4]
|
i
and
micom
controller
i
s
i
'
controller
eee eens l 4
Measure
the
Less
than
a3
Lefective
i
=
a
output
power
630W
+
nagnelon
a
__.
eee
;
Pe
oad
a
i
ee
eee
te
eh
Ae
ae
:
Saeed
r:
aon
Detective
——
Replace
:
2.
Oven
stops
as
:
(Check
tne
=
:
tie
{
Ssoonas
"START
Ef
Ga
BUR
ala
baciee
=
ar
pad
1s
touched
(shortegy
|
NOTE
3:
The
periods
ol
the
line
voltage
being
applied’
COOKING
TIME
COMPLAL
eee
ee
Cerrone
|
|
os
Paint
6
i
ould-ead-a
ré
faulting
the
microwave
oven, chec:
|
:
pet
:
;
;
ae
et
ing
when
complaints
of
excessively
long
+:
[
:
|
Sis
:
ses
received
SRS
rs
-.-e|
Check
continuity
“0”
ohm
-
uae
Replace
|
‘
:
between
terminals
:
a
ae
¢
Size
or
volume
of
food
ts
larger
thai
5
Oca
eval
;
off
time
miximum.
at
:
ot
stag
Set
otarecauten
eee
Ser
cas
om
Detective
Uh
ee
aoe
O
sec
*
Temperature
of
[uod
ts
loo
low.
(Frozen
cued
ae
6
food).
resistance
micom
controller
Replace
micom controller
WHEN
SENSOR
PROBE
!S
SHORTED
AND
START
PAD
{S$
TOUCHED,
“COOL”
APPEARS
IN
THE
DISPLAY
WINDOW.
:
;
CHECK
FOR
RESISTANC
ea
te
HIGHEST
SCALE.
* Cooking without a tid or cooking unwis,
* Check the house Inne voltage at the tre ct.
the microwave oven is used most ollen, writ:
other lamps and appliances that are norris!)
mit : : on. tf less than 216 Volis AC ihe protic: :
When the periods of the line voltage, are other than those line voltage. If the line voltage is subject |
dlisted ‘on the left, replace the touch control circuit. variations, or if the wiring is inadequal«:,
a the problem may rest with the local pow:
or the electrician.
NOTE: <«
—&
BETWEEN
THE
FOLLOWING
SEGMENTS
BY
USING
TESTER
ON
TEMP PROBE.
Ar PROBE JACK