Samsung RE-1200 User manual

SERVICE MANUAL
MODEL:RE-1200
34L
SAMSUNG
~ ELECTRONICS
S.E.G
COMBINATION OVEN
Y 000009000
SPECIFICATIONS
Power
Source
:
220
50Hz
Single
Phase
Power
Consumption
>
Microwave
only;
1400W
Convection(Heater); 1400W
Grill(Heater); 1300W
Power
Output
:
80~
800W(5
Power
Level)
Working
Frequency
> 2450MHz
Timer
:
99
Minutes
95
Seconds
Cooling
Method
:
Air
Cooling
Outside
Dimensions
,
>
496(L)x588(W)x380(H)
mm
Oven
Cavity
Dimensions
~
:
355(L)x355(W)x275(H)
mm
Shipping
Weight
:
Approx.
36Kg
Specifications are subject to change without notice.

—_
PRECAUTIONS
TO
BE
Technical
service
information
contained
herein
is
supplied
solely
for
use
by
qualified
service
personnel
trained
in
the
repair
of
microwave equipment.
.
Do
not
operate
the
oven
or
allow
it
to
be
operated
OBSERVED
BEFORE
AND
DURING
SERVICING
TO
|
AVOID
POSSIBLE
EXPOSURE
TO
EXCESSIVE
MICROWAVE
ENERGY
|
inspection
inside
the
microwave
generating
compart-
my
with the door opened.
_
Make
the
following
safety
checks
on
all
ovens
to
be
_
gerviced
before
activating
the
magnetron
or
other
microwave
source,
and
then
make
repairs
as
neces-
sary:
(A) interlock operation.
(B) Proper door closing.
(C)
Seal
and
sealing
surfaces
(arcing,
wear,
or
other
damages)
(D)
Damage
to
or
loosening
of
hinges
and
latches.
(E)
Evidence
of
dropping
or
abuse.
.
Before
turning
on
microwave
power
for
service
test
or
SAFETY
CHECKS
TO
BE
PERFORMED
AFTER
EACH
SERVICE
CALL
For
absolute
safety
of
the
user
with
interest
in
good
service,
the
following
safety
checks
should
be
per-
formed
upon
the
conclusion
of
any
service
to
this
ap-
pliance.
.
Check
electric
cord
and
plug.
Ask
user
if
improperly
grounded
wall
receptacle
is
being
used.
Check
cord
grounding
lead
to
frame.
Check
for
con-
nection
and
continuity
between
ground
terminal
on
plug
and
oven
frame.
ments,
check
magnetron,
wave-guide
or
transmission-_
anne
line,
and
cavity
for
proper
alignment,
intergrity
and
connections.
4.
Any
defective
or
misadjusted
components
in
the
inter-
lock,
monitor,
door
seal,
and
microwave
generation
and
transmission
systems
shail
be
repaired
or
adjusted
by
procedures
described
in
this
manual
before
releas-
ing
oven
to
the
owner.
5.
A
microwave
leakage
check
to
verify
compliance
with
Federal
Performance
Standard
should
be
performed
on
each
oven
prior
to
releasing
to
the
owner.
3.
Check
glass
tray
and
guide
roller
for
proper
installation
inside
oven.
4.
Make
physical
check
of
door
for
build-up
of
soil
on
door
seals
or
any
possible
damage.
Check
door
fit
and
adjustment
according
to
the
instructions.
5.
Check
latch
switch
and
door
safety
switch
interlocks
according
to
the
instructions.
6.
Check
microwave
emission
prior
to
servicing
the
oven
if it
is
operative.

Contents
CONTENTS
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PRECAUTIONS
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OBSERVED
WHEN
TROUBLESHOOTING
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Saat
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8.
WIRING
DIAGRAM.
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9
DISASSEMBLY
INSTRUCTION
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10.
INTERLOCK
MECHANISM
FUNCTIONS
&
ADJUSTMENT
2.00.0...
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24-25
14°
MEASUREMENTS.
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12.
TROUBLESHOOTING
GUIDE
OF
M.W.
OVEN
......
2.02.
cece
cn
cee
tenet
teens
28-33
13.
TROUBLESHOOTING
GUIDE
OF
TOUCH
CONTROL
CIRCUIT
....
2.
en
eens
34-35
14.
TOUCH
CONTROL
CIRCUIT
DESCRIPTIONS
.......
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36-48
15.
EXPLODED
VIEW
&
PARTS
LIST
........
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49-55
16.
P.C.B
CIRCUIT
DIAGRAM
&
PARTS
LIST
10...
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56-57
47
ACCESSORY
PARTS:
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58
NECESSARY
TOOLS
AND
MEASURING
INSTRUMENTS
1. Necessary tools 2. Necessary measuring instruments
Tools normally used for TV servicing are sufficient. * Tester (Volt D.C/A.C - ohm meter)
Standard tools are listed below. * Ruler
* Diagonal pliers * Microwave energy survey meter
* Philips head screwdriver * 600cc glass beaker
* Socket wrench (SIZE 8, 15mm) * Glass thermometer 100°C or 212°F with alcohol
* Nutdriver (SIZE 5.5, 7.8mm) column.
* Solder * Two 1 liter beakers.
* Vinyl insulation tape
* Long-nose pliers
* Slotted head screwdriver
* Adjustable wrench
* Soldering iron
* Polishing cloth

p
1. For Safe Operation
Damage that allows the microwave energy(that cooks
or)
to
expose
will
result
in
poor
cooking
and
may
cause
serious injury to the operator.
IF ONE OF THE FOLLOWING CONDITIONS EXISTS,
THE
OPERATOR
MUST
NOT
USE
THE
APPLIANCE.
(Only
a
trained
service
personnel
should
make
repairs.)
(A)
A
broken
door
hinge.
(B) A broken door mesh plate.
(C) A broken front panel to oven cavity.
(D) A loosened door lock.
(E) A broken door lock. ‘
The
door
gasket
plate
and
oven
cavity
surface
should
be
kept
clean.
No
grease,
soil
or
spatter
should
be
allowed
to
build
up
on
these
surfaces
or
inside
the
oven.
DO
NOT
ATTEMPT
TO
OPERATE
THIS
APPLIANCE
WITH
THE
DOOR
OPEN.
Interlock
switches
are
con-
cealed
from
outside
in
order
to
avoid
being
touched
by
someone’s
mistake
so
that
the
operation
of
oven
stops
when
the
door
is
opened.
Be
coutious
not
to
break
them.
Notice
that
you
should
not
attempt
any
service
unless
you
read
this
service
manual.
roper Use and Precautions
2. Correct Installation
(A) This microwave oven weighs 36Kg and must be -
placed on a horizontal base strong enough to sup-
port the weight.
(B) The oven should be placed as far from high tempera-
ture heat source and vapour as possible.
(C) The power supply cord is 2m long. Grounding is
required
when
connecting
the
power
source.
(D)
Power
consumption
of
this
oven
is
approximately
2.9kW.
It
suggests
that
the
unit
is
operated
on
such
power
line
that
can
provide
more
power
than
this
rating.
(E) Objects must not be placed on the top enclosure
SO
as
not
to
obstruct
air
flow
for
ventilation.
EXTERNAL VIEWS
(Fig. 1) Front View
fia
ener
etre
eh
eee
(Fig. 2) Side View

Circuit Descriptions
Refer to the wiring diagram on page 16.
1. When the food is placed inside the oven and the
door is closed
(A) The low voltage transformer supplies necessary volt-
age to the touch control circuit when the power
cord is plugged in.
(B) The primary interlock switch and the secondary in-
terlock switch are closed.
(C) The interlock monitor switch is opened. This interlock
monitor switch acts to blow 15A fuse and stop mag-
netron oscillation when the door is opened during
operation under an abnormal condition. (i.e. the
contacts of primary interlock switch do not open
and the contacts of secondary interlock switch do
not close the circuit to stop oscillation)
(D) The door key is caught by the door hook, the door
sensing switch is opened to give touch control circuit
the information that the door is closed.
2, When cooking cycle, power and time are set by touch-
ing the function pads and the desired numerical pads
(A) Cooking function word shown on the display window
blinks to indicate the selected function.
(B) The time set appears in the display window.
(C) The touch control circuit stores the cooking data
set.
3. When the START pad is touched
The main relay and the power control relay are controlled
by the touch control circuit.
(A) An ovenlamp lights the inside of the oven by operation
of the main relay in the Touch Control Circuit.
(B) Fan motor rotates and cools the magnetron by blow-
ing the air coming from the intake on the back panel
over the magnetron fins. After cooling the fins, this
air is directed into the oven to blow out the vapor.
(C) 220VAC is applied to the high voltage transformer
through the contacts of primary and secondary
switches shown by the solid line just after the power
control relay turns ON. (Fig. 3)
SECONDARY INTERLOCK
SWITCH
1A FUSE
MAIN INTERLOCK
RELAY | MONITOR
SWITCH
————
PRIMARY INTERLOCK
SWITCH
(D) 3.3V AC is generated from the filament winding of the
high voltage transformer. This 3.3V is applied to the
magnetron to heat the magnetron filament through two
noise preventing choke coils.
(E) High voltage of 2,120 volts AC is generated from the
high voltage transformer secondary and this secondary
voltage is increased by the action of the diode and
the charging of the high voltage capacitor. This resul-
tant D.C. voltage is then applied to the anode of the
magnetron. As shown in the Fig. 4, the first half cycle
of the high voltage produced in the secondary high
voltage transformer charges the high voltage capacitor.
| AC S.3ViEUF FT RES FFs |
|MAGNETRON
(Fig. 4)
Current flow is in the direction of the dotted line. During
the second half cycle, the voltage produced by the
transformer secondary and the charge of the high volt-
age capacitor are combined and applied to the mag-
netron as shown by the solid line so that oscillations
begin. The disturbance wave generated from the mag-
netron is prevented by the chock coils of 1.6uH, filter
capacitors of 500pF and the magnetron shielded case
so that TV and radio programs are not impaired by
noise.
(F) The power contro! relay is turned on intermittently by
the touch control circuit, when the oven is set at any
power selection except for full power. The touch con-
trol circuit controls the ON/OFF time of the power con-
trol relay in order to vary the output power of the
microwave oven from “Low” to “Full” power. One com-
plete ON/OFF cycle of the power control is 30 seconds.
The relation between indications on the control panel
and the output power level of the microwave oven is
on the page 35.

Circuit
Descriptions
(G)
The
cooking
time
shown
on
the
display
starts
to
count down.
4.
When
the
door
is
opened
during
cooking
|
fa
aay
a
(A)
The
primary
interlock
switch
and
secondary
interlock
|
SWITCH
switch
are
opened
to
cut
off
the
primary
voltage
of
FUSE
INTERLOCK
the
high
voltage
transformer
to
stop
microwave
os-
MONITOR
HV.
cillation.
=)=
SWITCH
TRANS.
(B)
The
door
sensing
switch
is
closed
to
give
the
door
open
information
to
touch
control
circuit.
The
main
relay
stays
on,
the
power
control
relay
turns
off
and
the
display
stops
counting
down.
(C)
The
fan
motor
and
turn-table
motor
are
stoped
by
operation
of
the
primary
or
secondary
interlock
switch.
But
the
oven
lamp
lights
the
inside
of
the
PRIMARY
INTERLOCK
ie SWITCH
Dees een;
oven
again
until
the
door
is
closed.
5.
When
the
CANCEL
pad
is
touched
during
cooking
(D)
Upon
opening
the
door,
the
contacts
of
primary
(A)
Once
touching
of
the
CANCEL
pad
stops
the
time
interlock
switch
and
secondary
interlock
switch
cooking.
Twice
touching
of
the
pad
cancels
all
open
and
the
contacts
of
interlock
monitor
switch
programs
stored
in
the
touch
control
circuit.
The
close
the
short
circult.
time
of
day
reappears
on
the
display
window.
(E)
If
the
contacts
of
primary
interlock
switch
and
secon-
dary
interlock
switch
do
not
funtion
properly,
the
15A
fuse
blows
out
due
to
the
large
current
surge
caused
by
the
monitor
switch
activation,
and
this
in
turn
stops
magnetron
oscillation.
(Fig.
5)
(B)
The
oven
lamp
and
cooking
indicators
turn
off.
(C) The fan motor stops.
(D)
The
power
control
relay
turns
off
to
cut
primary
voltage
to
high
voltage
transformer
so
that
the
mag-
netron
stops
oscillation.
CAUTIONS
TO
BE
OBSERVED
WHEN
TROUBLESHOOTING
UNLIKE
MANY
OTHER
APPLIANCES
THE
MICROWAVE
OVEN
IS
A
HIGH
VOLTAGE
AND
HIGH
CURRENT
EQUIPMENT.
THOUGH
IT
IS
FREE
FROM
DANGER
IN
ORDINARY
USE,
EXTREME
CARE
SHOULD
BE
TAKEN
DURING
REPAIR.
WARNING
PACEMAKER
WEARERS
MUST
CONSULT
THEIR
PHYSICIAN
BEFORE
SERVING.
CAUTION
SERVICEMEN
SHOULD
REMOVE
THEIR
WATCHES
WHENEVER
WORKING
CLOSE
TO
O
REPLACING
THE
MAGNETRON.

Cautions
Observed
When
Troubleshooting
CAUTION
SERVICEMEN
SHOULD
REMOVE
THEIR
WATCHES
WHENEVER
WORKING
CLOSE
TO OR
REPLACING
THE
MAGNETRON.
IMPORTANT
1. Check the earthing.
Do
not
operate
on
a
2-Wire
extension
cord.
The
microwave oven is designed to be used when earthed.
It
is
imperative,
therefore,
to
make
sure
the
oven
is
earthed properly before repair work.
2.
Warning
about
the
electric
charge
in
the
high
voltage
capacitor.
For
about
30
seconds
after
the
operation
stops,
an
electric
charge
remains
in
the
high
voltage
capacitor.
When
replacing
or
checking
parts,
be
sure
to
short
all
the
terminals
between
the
oven
chassis
and
the
high
voltage
capacitor
using
a
properly
insulated
jumper
wire.
|
i
WARNING
THERE
IS
HIGH-VOLTAGE
PRESENT,
WITH
HIGH-CURRENT
CAPABILITIES
IN
THE
CIRCUITS
OF
THE
HIGH
VOLTAGE
TRANSFORMER
SECONDARY
AND
FILAMENT
TRANSFORMER
SECONDARY.
IT
IS
EXTREMELY
DANGEROUS
TO
WORK
ON
OR
NEAR
THESE
CIRCUITS
WITH
THE
OVEN
ENERGIZED.
3.
When
parts
are
replaced,
must
remove
the
power
6.
Pacemaker
wearers
should
consult
their
physician
plug
from
the
outlet.
before
attempting
to
service
or
repair
a
microwave
oven.
For
additional
information
on
this
subject,
4.
When
the
15Amp
fuse
is
blown
due
to
the
operation
write
to
the
manufacturer
of
your
pacemaker.
of the Interlock Monitor Switch:
(A)
Replace
the
primary
interlock
switch,
secondary
in-
7.
Confirm
after
repair.
terlock
switch
and
interlock
monitor
switch.
This
is
(A)
After
replacement
of
parts,
make
sure
that
the
screws
mandatory.
Refer
to
page
24
for
the
measurement
are
neither
loose
nor
missing.
Microwaves
might
and
adjustments
for
these
switches.
leak
if
the
screws
are
not
properly
tightened.
(B)
When
replacing
the
fuse,
confirm
that
it
has
the
(B)
Make
sure
that
all
electrical
connections
are
tight
appropriate
rating
for
this
model.
before
inserting
the
plug
into
the
wall
outlet.
(C)
Check
for
radiation
leakage.
(Refer
to
procedure
for
5.
Avoid
inserting
nail,
wire,
etc.
through
any
holes
in
measuring
radiation
leakage
pages
26
and
27.)
the units during operation.
Never insert a wire, nail or any other metal object through
the
holes
on
the
cavity
or
any
other
holes
or
gaps,
because such objects may work as an antenna and
cause microwave leakage.

Features
.
Oven
door
enable
to
view
the
food
being
cooked.
. Interior
oven
Jamp.
. Thermistor sensor
: Barbecue Bar holder
. Grill heater
6.
Two
door
latches
and
safety
interlocks
. Roller ring
. Oven tray (removable) ceramic turn table
. Display window
10. Function selector pads
St—_1)
11.
Door
open
button
1. ROTATING BASE
This
fits
over
the
shaft
in
the
centre
of
the
oven
floor.
It
should
be
puctually
located
on
the
spindle.
Once
the
rotating
base
is
fitted
in
position,
it
should
only
be
removed
for
cleaning.
2. TURNTABLE TRAY
This
should
be
placed
on
the
rotating
base.
The
wheels
of
the
base
should
fit
inside
the
centre
rim
of
the
tray.
When
correctly
located
you
should
be
able
to
rotate
it
gently
by
hand.
The
turntable
tray
service
as
the
main
cooking
surface.
It
is
easily
removed
for
cleaning.
NOTE:
THE
OVEN
SHOULD
NOT
BE
OPERATED
WITHOUT
THE
BASE
AND
TURNTABLE.
3.
METAL
RACK
:
|
The
rack
is
used
to
cook
two
dishes
at
once.
A
small
dish
may
be
placed
on
the
turntable
and
a
second
dish
on
the
tray.
The
metal
racks
should
be
used
in
convection
or
combination
cooking.
4.
HOLDER
.
After
barbecue
cooking,
used
to
prevent
danger
from
hot
heat
when
taking
out
food.
5. BARBECUE BAR
Used
only
for
barbecue
cooking.
NOTE:
INSERT
FOOD
INTO
THE
BARBECUE
BAR
WITH
BALANCE.
|

hoe
St yGt. JAUFTAUAUTOMATIK
Tver
CONTROL PANEL
WINDOW DISPLAY AND INDICATOR LIGHTS
“Function Indicator Lights show which cooking funtion is be-
ing set or used.
* Digital Oisptay shows the current time of day and left cook-
\ ing time.
* Power indicater Light Indicates which power is being set or
used.
FUNCTION SELECTOR PADS
“Clock set, auto start
*Power Level select
"Microwave, Convection, Grill, Combination cook
* Auto. Defrost
“Memory
"Program review
” Rotating spit
"Temperature Set
“Min Plus, Min Minus
“Cancel, start
DOOR OPEN BUTTON
"Push to open the door
—To stop the oven, operation
—To put food on turntable
—To take out food

CONVERSION
CHART
(PAD
NAME)
fELOGK
|=
UHRA}
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STDMIN|=
MIN,AUTO
START
=
AUTO
START,
[COMBI
"=
KOMBi,
WEIGHT
DEFROST
=
AUFTAUAUTOMATIK,
POWER
LEVEL:
=
LEISTUNGSSTUFEN,
[MICROWAVE]
=
MIKROWELLE,
CONVECTION
|=
HEISSLUFT,
GRILL!
=
GRILL[SPIT,=
SPIES
TEMP?
=
TEMP.
[PROGRAM
AERIEW
.
GRILL!
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at
=
:
Ba
PROGRAMM
AUTOMATIK,
(MEMORY
|=
SPEICHER
AUTOMATIK
(CANCEL
]=
LOSCHEN,
START]
=
START
-
—-
=.
OPERATIONS
SET
THE
CLOCK
AS
FOLLOWS
Step
1.
Touch
the
CANCEL
pad
to
cancel
any
programme
and
you
will
be
in
clock
function.
1ST
Step
2.
Touch
the
CLOCK
pad.
i
f.
fi
Ly
The
colon
between
HOUR
and
MINUTE
will
bink
on
and
off.
Step
3.
Set
the
time
by
pressing
the
buttons
marked
HR
and
MIN.
Keep
pressing
the
but-
tons
for
the
figures
to
roll
on
quickly.
Step
4.
Touch
the
CLOCK
pad.
The
clock
is
now
set
and
then
will
flash
continuously.
The
clock
is
now
keeping
time
and
will
show
on
the
display
while
oven
is
not
operated.
If
the
oven
is
turned
off
from
the
mains
for
any
reason
the
display
will
show
all
figures
when
it
is
switched
again
and
you
will
have
to
re-set
the
clock.
At
this
time
you
can
re-enter
any
data
you
want
after
the
child
locking
indicator
disappears.
To
recall
the
time
during
cooking,
touch
CLOCK
and
the
present
time
of
day
will
show
on the
display
for
a
few
seconds
before
it
enter
to
the
cooking
programme.
,
Your
Combination
oven
has
a
built-in
24-hour
clock:
COOKING
BY
MICROWAVE
Microwave
cooking
is
ideal
for
fishes.
vegetables
(fresh
or
frozen),
sauces,
steamed
puddings,
jams
and
preserves,
rices,
pastes,
soups
and
drinks.
You
can
also
use
the
microwave
mode
for
fast
defrosting
and
re-heating
of
previously
cooked
food.
Remember
only
to
use
microwave-safe
utensils
when
you
cook
by
microwave.
Step
1.
Place
food
on
turntable
in
oven.
Never
switch
the
microwave
mode
when
the
oven
is
empty.
Step
2.
Close
the
oven
door.
Step
3.
Touch
the
MWO
pad.
The
display
will
show
4
(microwave
mode)
and!
(100%
power).
Step
4.
Set
the
length
of
cooking
time
by
pressing
the
three
pads
marked
10
min.
1
min,
15sec.
9
Hea
G
For
Example:
To
set
12
minutes
30
seconds,
press
10
min
pad
once,
1
min
pad
(Ge
cy
twice,
15
second
pad
twice.
ag
Step
5.
Select
the
required
power
level
by
pressing
the
power
level
pad.
The
power
level
indicators
on
the
display
will
glow.
Step
6.
Touch
START
(<>)
pad.
The
lamp
in
the
oven
will
illuminate
and
the
turntable
will
start
rotating.
The
micro-
wave
indicator
will.glow
to
show
that
the
microwave
cooking
starts.
The
timer
will
count
down.
Step
7.
After
cooking
the
timer
beeps
and
the
oven
stops
operating.
And
the
display
returns
automatically
to
the
present
time.
: