PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSI VE MICR OWAV E 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) Dam age to or loosening of hinges and latches, (5) Evidence of
dropping or abuse.
(c) Before turning on power to the microwave oven for any service test or inspection within the microwave
generating compartments, check the magnetron, wave guide or transmission line, and cavity for proper
alignment, integrity, and connections.
(d) 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 manual before the
oven is released to the owner.
(e) A microwave leakage check to verify compliance with the Federal performance standard should be performed on
each oven prior to release to the owner.
SAFETY AND PRECAUTIONS........................................................................................................... 2
FOR SAFE OPERATION................................................................................................................................. 2
FOR SAFE SERVICE PROCEDURES................ .. ........................ .. .. ............ .. .. ............ .. .. ............ .. .. .............. 2
FEAT UR E D IA G RAM ............ ... .. ....... .. .. ....... ... .. ....... .. .. ....... .. ... ....... .. .. .............. .. .. ....... ... .. ....... ........................ 5
CONTROL PANEL........................................................................................................................................... 6
This Device is to be Serviced Only by Properly Qualified S ervice Personnel. C onsult the Service Manual for
Proper Service Procedures to Assure Continued Safety O peration and for Precautions to be Taken to Avoid Possible
Exposure to Excessive Microwave Energy.
1. FOR SAFE OPERATION
Damage that allows the microwave energy ((that cooks or heats the food) to escape will result in poor cooking and may
cause serious bodily injury to the operator.
IF ANY OF THE FOLLOWING CONDITIONS EXIST, OPERATOR MUST NOT USE THE APPLIANCE.
(Only a trained service personnel should make repairs.)
1) A broken door hinge.
2) A broken door viewing screen.
3) A broken front panel, oven cavity.
4) A loosened door lock.
5) 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 . The microwave oven has concealed
switches to make sure the power is turned off when the door is opened. Do not attempt to defeat them.
DO NOT ATTEMPT TO SERVICE THIS APPLIAN CE UN TIL YOU HAVE READ THIS SERVICE MANUAL.
2. FOR SAFE SERVICE PROCEDURES
1) If the oven is operative prior to servicing, a microwave emission check should be performed prior to servicing the oven.
2) If any certified oven unit is found to servicing, a m icrowave emission check should be performed prior to servicing
the oven.
(a) inform the manufacturer, importer or assem b ler,
(b) repair the unit at no cost to the owner,
(c) attempt to ascertain the cause of the excessive leakage,
(d) tell the owner of the unit not to use the unit until the oven has been brought into compliance.
3) If the oven operates with the door open, the service person should tell the user not to operate the oven and contact
the manufacturer and CDRH immediately.
CAUTION
MICROWAVE RADIATION
PERSONNEL SHOULD NOT BE EXPOSED TO THE M ICROWAVE ENERGY WH ICH MAY RADIATE FROM THE
MAGNETRON OR OTHER MICROWAVE GENERATING DEVICE IF IT IS IMPROPERLY USED OR CONNECTED.
ALL INPUT AND OUTPUT MICROWAVE CONNECTIONS. WAVEGUIDE FLANGES AND GASKETS MUST BE
SECURE. NEVER OPERATE THE DEVICE WITHOUT A MICROWAVE ENERGY ABSORBING LOAD ATTACHED.
NEVER LOOK INTO AN OPEN WAVEGUIDE O R ANTENNA W HILE THE DEVICE IS ENERGIZED.
Page 4
SPECIFICATIONS
MOD ELKOR-631G/H1AKOR-861G/H1A
POW ER SU PPLY120V-60Hz, SINGLE PH ASE W ITH GRO UN DING
MICROW AVE1200W1350W
POW ER
CONSUMPTION
MICROWAVE ENERGY OUTPUT800W900W
MICROWAVE FREQUENCY2450MHz
OUTSIDE DIMENSIONS (W X H X D)465 x 279 x 360mm (18.3 x 11.0 x 14.2 in.)495 x 294 x 388mm (19.5 x 11.6 x 15.3 in.)
CAVIT Y DIMENS IONS (W X H X D )290 x 211x 306 m m (11.4 x 8.3 x 12.0 in.)320 x 228 x 338mm (12.6 x 9.0 x 13.3 in.)
NET W E IGHTAPPRO X . 12Kg ( 26.5lbs.)APPRO X. 14Kg ( 30.9lbs.)
TIMER59 min. 99 sec.
FUNCTION SELECTIONSMICROWAVE
POW ER SE LECTIONS10 LEVELS
GRILL
COMBINATION
CAVIT Y VOLUM E0.7 C u.Ft.0.9 C u.Ft.
SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTIC E.
Page 5
EXTERNAL VIEW
1. OUTER DIMENSION (KOR-631G/H1A, 861 G/H1A)
465/495
360/388
279/294
279/294
Page 6
2. FEATURE DIAGRAM
EXTERNAL VIEW
1. DOOR SEAL
Door seal m a intains the microwave within the oven cavity and prevents microwave leakage.
2. DOOR HOOK
When door is closed, it will automatically lock shut. If door is opened while oven is operating, magnetron tube will
immediately stop operating.
3. DOOR SCREEN
Allows viewing of food. Microwave cannot pass through perforations in screen.
4. SPATTER SHIELD
Protects the microwave outlet from splashes of cooking foods.
5. OVEN LAMP
Automatically turns on during oven operating.
6. SAFETY INTERLO CK SYSTEM
7. CONTROL PANEL
8. GLASS COOKING TRAY
Made of special heat resistant glass. The tray must always be in proper position before operating. Do not cook food
directly on the tray.
9. OVEN FRONT PLATE
10. DOOR OPENING BUTTON
To open the door, push the door opening button. When door is closed, it will automatically lock shut. If door is opened
w hile oven is operating, magnetron tube will immediately stop operating.
11. ROLLER GUIDE
Supports the glass cooking tray.
Page 7
EXTERNAL VIEW
3. CONTROL PANEL
1) KOR-631G1A/861G1A
1. Time set pad -
2. Disp lay
3. One touch
4. Auto cook
5. More
6. Less
7. Auto Defrost
8. Power
9. Defrost
10. Kitchen Timer
11. Clock
12. Stop/Clear
13. Start/Speedy cook
- Cooking time, power level, indicators and present time are displayed.
- Used to add time to cooking.
- Us ed to remov e ti me fr o m coo k i n g.
- Us ed to se t powe r l e ve l.
- Us ed to d efrost foo d s.(for time)
- Used to set clock .
Used to set the cooking time and the present time.
- Used to cook or reheat specific quantities of food.
- Used to cook or reheat.
- Used to defrost foods.(for weight)
- Used as a minute timer, delay cooking, hold setting after cooking.
- Used to stop the oven operation or to delete the cooking data.
- Used to start the oven and also used to set a reheat time.
Page 8
2) KOR-631H1A/861H1A
EXTERNAL VIEW
1. Time set pad
2. Disp lay
3. One touch
4. More
5. Less
- Used to add time to cooking.
- Us ed to remov e ti me fr o m coo k i n g.
6. Auto Defrost
7. Power
8. Defrost
9. Kitchen Timer
10. Clock
11. Stop/Clear
- Used to set the cooking time and the present tim e.
- Cooking time, power level, indicators and present time are displayed.
- Used to cook or reheat specific quantities of food.
- Used to defrost foods.(for weight)
- Us ed to se t powe r l e ve l.
- Us ed to d efrost foo d s.(for time)
- Used as a minute timer, delay cooking, hold setting after cooking.
- Used to set clock.
- Used to stop the oven operation or to delete the cooking data.
12. Start/Speedy cook
- Used to start the oven and also used to set a reheat time.
Page 9
INSTALLATI ON
1. Steady, flat location
This m icrowave oven should be set on a steady, flat surface.
2. Leave space behind and side
All air vents should be kept a clearance. If all vents are covered during operation, the oven may overheat and, eventually,
cause oven fa ilu re.
3. Away from radio and TV sets
Poor television reception and radio interference may result if the oven is located close to a TV, radio, antenna or feeder
and so on.
4. Away from heating appliances and water taps
Keep the oven aw ay from hot air, steam or splash w hen choosing a place to position it, or the insulation might be adversely
affected and breakdown s occur.
5. Power supply
•
Check your local power source.
This microw ave oven requires a current of approximately 12 am peres, 120 Volts, 60 Hz grounded outlet.
•
Power supply cord is about 1.2 meters long.
1. A short power-supply cord is provided to reduce the risks re sulting from becoming entangled in or tripping over a
longer cord.
2. Longer cord sets or extension cords are available and m ay be used if care is exercised in their use.
3. If a long cord or extension cord is used:
1) The marked electrical rating of the cord set or extension cord should be at least as great as the electrical rating of
the appliance.
2) The extension cord must be a grounding type 3-wire cord.
3) The longer cord should be arranged so that it will not drape over the counter top or tabletop where it can be pulled
on by children or tripped over unintentionally.
6. Examine the oven after unpacking for any damage such as:
A misaligned door, broken door or a dent in cavity.
If any of the above are visible, DO NOT INSTALL, and notify dealer immediately.
Page 10
OPERATIONS AND FU NCTIONS
1. Connect the main lead to an electrical outlet.
2. After placing the food in a suitable container, open the oven door and put it on the glass tray. The glass tray must always
be in place during cooking.
3. Close the door securely.
4. When the oven door is opened, the light turns off.
5. The oven door can be opened at any time during operation by touching the door release button on the control panel.
The oven will automatically shut off. To restart the oven, close the door and then touch START.
6. Each time a pad is touched, a BEEP will sound to acknowledge the touch.
7. The oven automatically cook on full power unless set to a lower power level.
8. The display will show :0 when the oven is plugged in.
9. Time clock returns to the present time w hen the cooking time ends.
10. When the STOP/CLEAR pad is touched during the oven operation, the oven stops cooking and all information retained.
To erase all information (except the present time), touch the STOP/CLEAR pad once more. If the oven door is opened
during the oven operation, all information is retained.
11. If the START pad is touched and the oven does not operate, check the area between the door and door seal for
obstructions and m ake sure the door is closed securely. The oven will not start cooking under the door is completely
closed or the program has been reset.
Make sure the oven is properly installed and plugged into the electrical outlet.
Wattage output chart
The power le vel is set by pressing the Power pad. The chart show s the display, the power level and the percentage of
power.
Touch Power pad.Power level (Display)Approximate Percentage of Power
Unlike many other appliances, the microwave oven is high-voltage, high-current equipm ent.
It is completely safety during normal operation. However, carelessness in servicing the oven
can result in an electric shock or possible danger from a short circuit.
You are asked to observe the following precautions carefully.
1. Always remove the power plug from the outlet before servicing.
2. Use an insulated screwdriver and ware rubber gloves when servicing the high voltage side.
3. Discharge the high voltage capacitor before touching any oven components or wiring.
(1) Check the grounding.
Do not operate on a two-wire extension cord.
The microwave oven is designed to be used with grounding.
It is imperative, therefore, to makes sure it is grounded properly
before beginning repair work.
(2) Warning about the electric charge in the high voltage capacitor.
For about 30 seconds after the operation stopped and electric
charge remains in the high voltage capacitor. When replacing
or checking parts, short between oven chassis and the negative
high terminal of the high voltage capacitor, by using a properly
insulated screwdriver to discharge.
4. When the 15A fuse is blown out due to the operation of the monitor
switch; replace primary interlock switch, secondary interlock switch
and interlock monitor switch.
5. After repair or replacement of parts, make sure that the screws are
properly tightened, and all electrical connections are tightened.
6. Do not operate without cabinet.
CAUTION
Service personnel should remove their watches whenever working close to or replacing the magnetron.
WARNING
W hen servicing the appliance, need a care of touching or replacing high potential parts because of electrical shock or
exposing microwave. These parts are as follows - HV Transform er, Magnetron, HV C apacitor, HV D iode.
Page 12
1. To remove cabinet
1) Remove three screws on cabinet back.
2) Push the cabinet backward.
2. To remove door assembly
1) Remove a screw which secure the stopper hinge top.
2) Remove the door assembly from top plate of cavity.
3) Reverse the above for reassembly.
D ISASSEMBLY AND ASSEMBLY
NOTE
After replacing the door assem bly, perform a check of correct alignm ent with the hinge and cavity front plate.
Page 13
D ISASSE MBLY AND ASSEM BLY
3. To remove door parts.
1) KOR-631G1A/631H1A
REF. NOPA RT CODEPART NAMEDESCRIPTIONQTYREMARK
A013512203800FRAM E D OO RABS XR -401 H-29381
A023517003050BARR IER-SCREEN *OACRYL1
A033515304610SUPPORTER BARR -S*OPP1
A043515204100STOPPER HINGE *T ASKOR-63150S1
A053511705500DOOR W ELD ASKOR-61150S1
A063517002800BARRIER-SCREEN *IPOLYESTER T0.11
A073512300200GASKET D OORPP1
A083513100700HOOKPOM1
A093515101300SPRING HOO KPW11
2) KOR-861G1A/861H1A
REF. NOPA RT CODEPART NAMEDESCRIPTIONQTYREMARK
A013512204100FRAM E D OO RABS XR -401 H-29381
A023517003150BARR IER-SCREEN *OACRYL1
A033515304410SUPPORTER BARR -S*OPP1
A043515204100STOPPER HINGE *T ASKOR-63150S1
A053511705620DOOR W ELD ASKOR-81250S1
A063517002900BARRIER-SCREEN *IPOLYESTER T0.11
A073512300400GASKET D OORPP1
A083513100700HOOKPOM1
A093515101300SPRING HOO KPW11
Page 14
1) Remove the gasket door from door plate.
2) Remove the barrier screen inner from door plate.
3) Remove the door frame from door plate.
4) Remove the stopper hinge top from door plate.
5) Remove the spring and the hook.
6) Remove the supporter barrier screen outer from door fram e.
7) Remove the barrier screen outer from door frame.
8) Reverse the above steps for reassem bly.
4. Method to reduce the gap between the door seal and the oven front surface.
1) To reduce gap located on part ‘A’.
Loosen a screw on stopper hinge top, and then
push the door to contact the door seal to oven front surface.
Tighten a screw.
D ISASSEMBLY AND ASSEMBLY
2) To reduce gap located on part ‘B’.
Loosen two screws on stopper hinge under, and then
push the door to contact the door seal to oven front surface.
Tighten two screws.
NOTE
A small gap m ay be acceptable if the microwave leakage does not exceed 4mW /cm2.
Page 15
D ISASSE MBLY AND ASSEM BLY
5. To remove control panel parts.
1) KOR-631G1A/631H1A
REF.NOPART CODEPART NAMEDES CRIPTIONQTYREMARK
B01
B023516719500CO NTR O L-PANELABS AF-345 HFA-700HT1
B033514320600PC B MAIN AS
B047122401211SCREW TAPPING
B053513702700LEVER DO OR O PENABS XR-401 H-29381
B06441G430171SPR ING BUTTO N
B073516906900BU TTON D O OR OPE N
3518521000
3518521010
SWITCH MEMBRANE
KOT-631G0A1
KOR-631H0A
KOR-631
H0A
T2S TRS 4X12 M FZN
SWP DIA0.7
ABS XR-401 H-2938
1
1
3
1
1
2) KOR-861G1A/861H1A
REF.NOPART CODEPART NAMEDES CRIPTIONQTYREMARK
B01
B023516720400CO NTR O L-PANELABS AF-345 HFA-700HT1
B033514320910PC B MAIN AS
B047122401211SCREW TAPPING
B053513702700LEVER DO OR O PENABS XR-401 H-29381
B06441G430171SPR ING BUTTO N
B073516906900BU TTON D O OR OPE N
3518521500
3518521510
SWITCH MEMBRANE
KOR-861G0A1
KOR-861
KOR-861
H0A
G0A
T2S TRS 4X12 M FZN
SWP DIA0.7
ABS XR-401 H-2938
1
1
3
1
1
Page 16
D ISASSEMBLY AND ASSEMBLY
1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly.
2) Remove the door open lever from the control panel.
3) Remove four screws which secure the PCB assembly to control panel.
4) Disconnect membrane tail from the connector of the PCB assembly.
5) Detach mem brane from the control panel.
6) Remove door open button and button spring from the control panel.
7) Reverse the above steps for reassem bly.
6. To remove high voltage capacitor.
1) Remove a screw which secure the grounding ring terminal
of the H.V.diode and the capacitor holder.
2) Remove the H.V. diode from the capacitor holder.
3) Reverse the above steps for reassem bly.
High voltage circuit wiring
7. To remove magnetron.
1) Remove a screw which secure the magnetron.
2) Remove the magnetron.
3) Reverse the above steps for reassem bly.
NOTE
Never install the magnetron without the m etallic gasket plate which is packed with each magnetron to prevent
microw ave leakage. W henever repair work is carried out on magnetron, check the microwave leakage. It shall
not exceed 4mW /cm
2
for a fully assembled oven with door normally closed.
Page 17
D ISASSE MBLY AND ASSEM BLY
8. To remove wind guide assembly.
1) Remove a screw which secure the wind guide assembly.
2) Draw forward the wind guide assembly.
3) Pull the fan from the motor shaft.
4) Remove tw o screws w hich secure the motor shaded pole.
5) Remove the motor shaded pole.
6) Reverse the above steps for reassem bly.
9. To remove H.V.transformer.
1) Remove four screws holding the H.V.transformer.
2) Remove the H.V.transform er.
3) Reverse the above steps for reassem bly.
Page 18
INTER L OCK MECHANISM AND ADJU STM E NT
The door lock mechanism is a device which has been specially designed to completely eliminate microwave radiation when
the door is opened during operation, and thus to perfectly prevent the danger resulting from the leakage of microw ave.
(1) P rima r y interlock switch
Wh e n the d o or is c l o s ed , the h oo k l o cks t h e oven d o or. If the door i s n ot closed prop erly, th e ov en will n ot o perate .
When the door is closed, the hook pushes the button of the m icroswitch. Then the button of the primary interlock switch
br in g it u n d e r “ON” co ndit ion.
(2) Secondary inte rlock switch and interlock monitor switch
When the door is closed, the hook pushes the lock lever downward. The lock lever presses the button of the interlock
monitor sw itch to bring it under “O FF” condition and presses the button of the secondary interlock switch to bring it
under “ON” condition.
ADJUSTME NT
Interlock monitor switch
W hen the door is closed, the interlock m onitor switch should be opened before other switches are closed.
W hen the door is opened, the interlock monitor switch should be closed after other switches are opened.
(3) Ad jus tment s tep s
a) Loosen the one mounting screw.
b) Adjust inte rlock switch assembly position.
c) Make sure that lock lever m oves smoothly after adjustment is completed.
d) Tighten completely one mounting screw.
NOTE
Microwave emission test should be performed after adjusting interlock m echanism. If the microw ave em ission exceed
4mW/cm
2
, readjust interlock mechanism.
Page 19
TROUBLE SHOOTING GUIDE
Following the procedure below to check if the oven is defective or not.
1) Check grounding before trouble checking.
2) Be care ful of the high voltage circuit.
3) Discharge the high voltage capacitor.
4) When checking the continuity of the switches, fuse or high voltage transformer, disconnect one lead wire from these parts
and ch ec k co ntinuity with the AC plug rem o ve d. To do otherwise may resu lt in a false reading or da mage to you r m e ter.
NOTE
When electric parts are checked, be sure the power cord is not inserted the wall outlet.
Check wire harness, wiring and connected of the terminals and power cord before check the parts listed below.
(TR OUB LE 1)
CONDITION
Fuse blows.
Ove n do es no t ope rate at all : any inpu ts can no t be ac cepted .
CHECKRESULTCAUSEREMEDY
Check continuity of
interlock monitor switch
with door closed
Replace fuse
Check continuity of prim ary
interlock sw itch contact
with door partially open
until interlock monitor switch
contact close
Check continuity of
prim ary winding of low
voltage transformer
Continuity
No Continuity
Continuity
0 infinite
or
Ω
Approx.
150~310
(normal)
Malfunction
of interlock
monitor
switch
Shorted contacts
of primary
interlock switch.
Defective low
voltage
transformer
Replace
NOTE 1
Replace
NOTE 1
Replace
Disconnect one side of the
lead wire connected form
high voltage transform er
to the high voltage capacitor
and operate the unit
Fuse again
blows
Defective high
voltage capacitor
Defective high
voltage transformer
Replace
Replace
Page 20
TROUBLE SHOOTING GUIDE
CONDITION
Outlet has
proper voltage
Fuse does not
blow.
CHECKRESULTCAUSEREMEDY
Check continuity of
magn etron
Check continuity of
power supply cord
Display do not
shown countdown
No
Continuity
No
Continuity
Normal
Defective
magn etron
Open pow er
supply cord
Defective touch
control circuit
Malfunction of
secondary
interlock sw itch
NOTE
All these switches must be replaced at the same time, please refer to “Interlock Mechanism And Adjustment”.
Replace
Replace
Replace
Replace
( TROUBLE 2 )
CONDITION
Turn table
m oto r, and
oven lamp do
not turn on
Display shows all figures selected, but oven does not start cooking, even though desired program and time
are set and start pad is tapped.
CHECKRESULTCAUSEREMEDY
Check continuity of
primary interlock sw itch
Check continuity of
secondary interlock switch
Che ck D .C. voltage
being supplied to
RELAY (RY2) coil
No
Continuity
No
Continuity
0 V
Approx
15 VDC
Malfunction
of primary
interlock sw itch
Malfunction
of secondary
interlock sw itch
Defective
touch control
circuit
Faulty
contacts of
RELAY
(RY2) or open
relay coil
Adjust or
Replace
Adjust or
Replace
Replace
Replace
Page 21
TROUBLE SHOOTING GUIDE
filament terminal of high
(
TROUBLE 3 )
CONDITION
No microwave
oscillation
N o micr o wave o scillation e ven thou gh fan mot o r rota tes.
CHECKRESULT
Check continuity of high
voltage capacitor
term in a ls with wire s
remo ve d
Check continuity of high
voltage rectifier in
forw ard and backward
direction w ith D C
megge r
Connect megger leads to
magne tron terminal and
magne tron body
Check resistance of
prim ary and secondary
coil of high voltage
transformer
Conti nuity
Continuity in
backward
direction
Continuity
or
0 Ω
CAUSE
Defective
high voltage
transformer
Defective
high voltage
rectifier
Defective
magnetron
Defective
high voltage
transformer
REMEDY
Replace
Replace
Replace
Replace
Check continuity of
magne tron w ith wires
remo ved
Check continuity of
voltage transform er
Che ck D .C. voltage
being supplied to
RELAY (RY1) coil
No
Continuity
No
Continuity
0 V
Approx
15 VDC
Defective
magnetron
Defective
high voltage
transformer
Defective
touch control
circuit
Faulty
contacts of
RELAY
(RY1) or open
relay coil
Replace
Replace
Replace
Replace
Page 22
TROUBLE SHOOTING GUIDE
Replace
control box
sub-assembly
Replace the
Malfunction
( TROUBL E 4 )
The following visual conditions indicate a probable defective touch control circuit or membrane switch assembly.
1. In complete segm ents,
1) Segments m issing.
2) Partical segments missing.
3) Digit flickering other than normal display slight flickering.
4) “ : 0 ” does not display when power is on.
2. A distinct change in the diplay are not on when they
numbers is the display.
3. One or more digits in the diplay are not on when they should be.
4. Display indicates a number different from one touched.
5. Specific numbers (for example 2 or 3) will not display w hen the panel is touched.
6. Display does not count down or up with time cooking or clock operation.
7. Oven is programmable and cooks normally but no display shows.
8. Display obviously jumps in time w hile counting down.
9. Display counts dow n noticeably too fast while cooking.
10. Display does not show the tim e of day when clear pad is touched.
11. O ven lamp and turntable m otor do not stop although cookin g is finished. Check if the RELAY 2 contacts close if they are
close, replace touch control circuit.
CONDITION
Display does
not show
programm ing
at all, even if
keyboard is
touched.
CHECKRESULTCAUSEREMEDY
Check each pad for
continuity of the
mem brane keyboard
for the following
keyboard check
procedure
Normal
Abnormal
of touch
control circuit
of control box
sub-assembly
Malfunction of
the mem brane
keyboard
membrane
keyborad
NOTE
Before following the particular steps listed above in the trouble shooting guide for the mem brane keyborad’s, failure,
please check for the continuity of each wire-harness between the membrane keyboard and P.C.B. assembly.
Page 23
ME ASUREME NT AND TEST
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT
Microwave output power can be checked by indirectly measuring the temperature rise of a certain amount of water exposed
to the m icrowave as directed below.
PROCEDURE
1. Microwave power output measurement is made with the m icrowave oven supplied at rated voltage and operated at its
maximum m icrowave power setting with a load of 1000 ± 5cc of potable water.
2. T h e w a te r is co nta in ed in a cy lin d ric a l b o ro s ilic a te g la s s v e s se l h a v in g a max imu m mate r ia l th ic kn e s s of 3 mm and an
outside diameter of approxim ately 190 mm .
3. The oven and the empty vessel are at ambient temperature prior to the start of the test. The initial tem p erature of the
water is 10 ± 2 °C (50 ± 3.6 ° F). It is m easured im mediately before the water is added to the vessel. After addition of
the water to the vessel, the load is immediately placed on the center of the shelf, which is in the lowest normal position.
4. Microwave power is switched on.
5. Heating tim e should be exactly A seconds.
(Refer to table as following)
Heating time is measured while the
microw ave generator is operating at
full power. The filament heat-up tim e
for magnetron is not included.
6. The initial and final tem perature of water is selected
so that the maximum difference betw een the ambient
and final water temperature is 5K.
7. The microwave power output P in w atts is calculated
from the follow ing formula:
P = 4187 X T
T is difference between initial and ending temperature.
t is the heating time.
The power measured should be B (Refer to SPECIFICATIONS) W ± 10.0 %.
CAUTION
1. Water load should be m easured exactly to 1 liters.
2. Input pow er voltage should be exactly specified voltage (Refer SPECIFIC ATIO NS).
3. Ambient tem perature should be 20
Heating time for power output:
A (second)7064605652494744424038
B (W)600650700750800850900950100010501100
± 2°C (68 ± 3.6 °F)
Page 24
MEASUR E MENT AND TE ST
2. MICROWAVE RADIATION TEST
CAUTION
1. Make sure to check the microw ave leakage before and after repair of adjustment.
2. Always start m easuring of an unknown field to assure safety for operating personnel from microwave energy.
3. Do not place your hands into any suspected m icrowave radiation field unless the safe density level is known.
4. Care should be taken not to place the eyes in direct line w ith the source of microwave energy.
5. Slowly approach the unit under test until the radiometer reads an appreciable m icrowave leakage from the unit
under the test.
PROCEDURE
1. Prepare Microw ave Energy Survey Meter,
600cc glass beaker, and glass thermometer
100°C (212°F ).
2. Pour 275cc ±15cc of tap w ater initially at 20 ± 5 °C
(68 ± 9°F) in the 600 cc glass beaker with an inside
diameter of approx. 95mm (3.5 in.).
3. Place it at the center of the tray and set it in a cavity.
4. Close the door and operate the oven.
5. Measure the leakage by using Microwave Energy
Survey Meter with dual ranges, set to 2450M H z.
1) Measured radiation leakage must not exceed the
value prescribed below. Leakage for a fully assembled
2
oven with door normally closed must be less than 4mW/cm
.
2) When measuring the leakage, always use the 5cm (2 in.) space cone with probe. Hold the probe perpendicular to the
cabinet and door. Place the space cone of the probe on the door, cabinet, door seem , door viewing screen , the exhaust
air vents and the suction air vents.
3) Measuring should be in a counter-clockwise direction at a rate of 1 in./sec. If the leakage of the cabinet door seem is
unknown, m ove the probe more slowly.
4) When measuring near a corner of the door, keep the probe perpendicular to the areas making sure the probe end at
the base of the cone does not get closer than 2 in. from any metal. If it does not, erroneous reading m ay result.
Page 25
MEASUR E MENT AND TE ST
3. COMPONENT TEST PROCEDURE
High voltage is present at the high voltage term inal of the high voltage transform er during any cooking cycle.
It is neither necessary nor advisable to attempt measurement of the high voltage.
Before touching any oven components or wiring, always unplug the oven from its power source and discharge the capacitor.
1. High voltage transformer
1) Remove connections from the transformer terminals and check continuity.
2) Normal readings should be as follows :
Secondary w inding ... Approx. 110 ±10%
once the capacitor charged.
Filament winding ... A pprox. 0
Prim ary winding ... Approx. 1
2. High voltage capacitor
1) Check continuity of capacitor with meter on the highest OH M scale.
2) A norma l capacito r will s ho w cont inu i ty fo r a sh or t t ime, and then indicate 10M
3) A shorted capacitor will show continuous continuity.
4) An open capacitor will show constant 10M.
5) Resistance between each term inal and chassis should be infinite.
3. High voltage diode
1) Isolate the diode from the circuit by disconnecting the leads.
2) With the ohmmeter set on the highest resistance scale measure the resistance across the diode term inals. Reverse
the meter leads and again observe the resistance reading. Meter with 6V, 9V or higher voltage batteries should be
used to check the front-back resistance of the diode, otherwise an infinite resistance may be read in both directions. A
normal diode's resistance will be infinite in one direction and several hundred k
in the other direction.
4. Magnetron
For com plete magnetron diagnosis, refer to “Measurement of the Microwave Power Output. " Continuity checks can only
indicate and open filament or a shorted magnetron. To diagnose for an open filament or a shorted m agnetron,
1) Isolate magnetron from the circuit by disconnecting the leads.
2) A continuity check across magnetron filament terminals should indicate 0.1
or less.
3) A continuity check between each filament terminal and magnetron case should read open.
5. Fuse
If the fuse in the primary and monitor switch circuit is blow n when the door is opened, check the primary and monitor
switch before replacing the blown fuse. In case the fuse is blown by an improper switch operation, replace the defective
switch and fuse at the same time. Replace just the fuse if the sw itches operate normally.
Page 26
WIRING DIAGR AM
Page 27
PRINTED CIRCUIT BOARD
1. CIRCUIT CHECK PROCEDURE
1. Low voltage transformer check
The low voltage transformer is located on the P.C.B.
Measuring condition: Input voltage: 120 V / Frequency: 60Hz
Terminal VoltageLOADNO LO AD
4 - 7AC 12.6 VAC 14.7 V
NOTE
1. Refer to Circuit Diagram (point 4).
2. Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source voltage.
3. The allowable tolerance of the secondary voltage is within 5% of nominal voltage.
2. Voltage Check
- Key check point
NOCHECK POINTREMARK
1IC1 PIN 2,21,30,34-5VDC
2IC1 PIN 35
T : 16.7 ms (60 Hz )
3IC1 PIN 31 OR 32
T : 250 ns( 4M Hz )
- Check method
NOMEASURE POINTWAVE FO RMREMEDYREMARK
1MP1DC -5V± 0.25VR eplace VL1, EC 1NO LO AD
2MP2DC -12V± 2.0VReplace E C2, D12,13,14NO LOA D
NOTE
Each measure point must be measured with GND points.
Page 28
PRINTED CIRCUIT BOARD
MP1
MP2
Measure Poin t
Page 29
PRINTED CIRCUIT BOARD
3. When there is no microwave oscillation
1) When touching
START
pad, oven lamp does not turn on.
Fan motor do not rotate, but cook indicator in display comes on.
Cause :
RELAY 2
does not operate. ref e r to Circ u it Diagram ( Point 3)
- Check method
PO INT
STATE
RELAY 2
RELAY 2
2) When touching
ON- 5VDCGND
OFFGND- 12VDC
START
pad, oven lamp turns on.
AB
Fan motor and turntable rotate and cook indicator in display comes on.
Cause :
RELAY 1
does not operate. ref e r to Circ u it Diagram ( Point 2 )
- Check method
P OINT
STATE
RELAY 1
RELAY 1
O N-5V DCGN D
OFFGND-12VDC
AB
4. When the door is opened during operation, the count down timer does not stop.
refer to Circuit Diagram ( Point 1 )
- Check method
POINT
STATE
1) DOOR OPENOPEN-5VDC
2) DOOR CLOSEDCLOSEGND
CHECK NOMETHODREMEDY
1
Ch eck the stage(O N,OF F) of the seco n dary interlock sw itch by re sistance
me asurement.
AB
Replace secondary interlock switch.
5. When the digital clock does not operate properly.
refer to Circuit D iagram ( Point 5 )
POINTWAVE FORM
A T: 16. 7 ms (60 Hz )
If clock does not keep exact time, you must check resistor R15,16, zener diodeZ D1.
Page 30
2. P.C.B. CIRCUIT DIAGRAM
1) KOR-631G1A/631H1
PRINTED CIRCUIT BOARD
Page 31
PRINTED CIRCUIT BOARD
3. P.C.B. LOCATION NO
1) KOR-631G1A/631H1A
NONAMESYMBO LSPECIFICATIONPART CODEQ'TY
1B UZZERBZ1BM -20K35156001001
2C ARR AYCA17P(6) 102 M 50VCN6XB-102M1
3C APACITOR ELECEC116V RSS 100uFCEX F1C101V1
4C APACITOR ELECEC225V RSS 1000uFCEXF1E102V1
5C ON NE CTOR WAF ERCN1YW 396-02AV35191505201
6C ON NE CTOR WAF ERCN2YW 396-05AV35191505101
7C ON NE CTOR WAF ERCN3FCZ254-11441M3671601
8D IODE R ECTIFYD1~6,9~121N4148DZN4148---10
9D IODE R ECTIFYD13,141N4002ADZN4002A--2
10D IODE ZENERZD1MTZ 5.1VB 1/2WDZTZ5R1B--2)
11DIODE ZENERZD2M TZ 3.9VB 1/2WDZTZ3R9B--1
12LED DISPLAYDP1DDG-631HDDD G631H --1
13PCB MA INM15881.5X139.935143154101
14R ARRAYRA17P(6) 1/8 100K JRA-87X104J1
15RESISTORR1~R71/6W 330 5%RD-AZ331J-7
16RESISTORR8,10,12,14,221/6W 1K 5%RD-AZ102J-5
17RESISTORR11,20,211/6W 100K 5%RD-AZ104J-3
18RESISTORR131/6W 100 5%RD -AZ101J-1
19RESISTORR15~171/6W 10K 5%RD-AZ103J-3
20RESISTORR181/6W 1M 5%RD -AZ105J-1
21RESISTORR191/4W 51 5%RD-4Z510J-1
22REGULATORVL1M C7905C1MC 7905C--1
23TRANSISTORQ1~5,9~11KRA-102MTZRA102M--8
24TRANSISTORQ6KTA-1270YTZTA1270Y-1
25TRANS PO W ERLVT1DMR -631P5EPU 0353021
26W IRE COPPERJ1-J211/0.52 TIN COATING85801052G Y21
27W IRE COPPERSJ31/0.52 TIN CO ATING85801052GY1
28IC MICOMIC1TMP 47C440BN13G S 631GH01
29RESONATOR CERACR1KBR-4.0MSTF5PKBR40MKS1
30SW RE LAYRY1G5G-1A DC12V5SC01011211
31SW RE LAYRY2G5B-1 DC12V5SC01011101
32CAPACITOR CER A C6102 50V Z AXIALCCZB1H102K1
33CAPACITOR CER A C1~5,C7104 50V Z AXIALCC ZF1H104Z6
Page 32
PRINTED CIRCUIT BOARD
2) KOR-861G1A/861H1A
NONAMESYMBO LSPECIFICATIONPART CODEQ'TY
1B UZZERBZ1BM -20K35156001001
2C ARR AYCA17P(6) 102 M 50VCN6XB-102M1
3C APACITOR ELECEC116V RSS 100uFCEX F1C101V1
4C APACITOR ELECEC225V RSS 1000uFC EX F1E102V1
5C ON NE CTOR WAF ERCN1YW 396-02AV35191505201
6C ON NE CTOR WAF ERCN2YW 396-05AV35191505101
7C ON NE CTOR WAF ERCN3FCZ254-11441M3671601
8D IODE R ECTIFYD1~6,9~121N4148DZN4148---10
9D IODE R ECTIFYD13,141N4002ADZN4002A--2
10D IODE ZENERZD1MTZ 5.1VB 1/2WDZTZ5R1B--2)
11DIODE ZENERZD2M TZ 3.9VB 1/2WDZTZ3R9B--1
12LED DISPLAYDP1DDG-631HDDD G631H --1
13PCB MA INM15881.5X139.935143154101
14R ARRAYRA17P(6) 1/8 100K JRA-87X104J1
15RESISTORR1~R71/6W 330 5%RD-AZ331J-7
16RESISTORR8,10,12,14,221/6W 1K 5%RD-AZ102J-5
17RESISTORR11,20,211/6W 100K 5%RD-AZ104J-3
18RESISTORR131/6W 100 5%RD -AZ101J-1
19RESISTORR15~171/6W 10K 5%RD-AZ103J-3
20RESISTORR181/6W 1M 5%RD -AZ105J-1
21RESISTORR191/4W 51 5%RD-4Z510J-1
22REGULATORVL1M C7905C1MC 7905C--1
23TRANSISTORQ1~5,9~11KRA-102MTZRA102M--8
24TRANSISTORQ6KTA-1270YTZTA1270Y-1
25TRANS PO W ERLVT1DMR -631P5EPU 0353021
26W IRE COPPERJ1-J211/0.52 TIN COATING85801052G Y21
27W IRE COPPERSJ1, SJ31/0.52 TIN COATING85801052GY2
28IC MICOMIC1TMP 47C440BN13G S 861GH01
29RESONATOR CERACR1KBR-4.0MSTF5PKBR40MKS1
30SW RE LAYRY1G5G-1A DC12V5SC01011211
31SW RE LAYRY2G5B-1 DC12V5SC01011101
32CAPACITOR CER A C6102 50V Z AXIALCCZB1H102K1
33CAPACITOR CER A C1~5,C7104 50V Z AXIALCC ZF1H104Z6
Page 33
EXPLODED VIEW AND PARTS LIST
1. DOOR ASSEMBLY
Refer to Disassembly and assembly.
2. CONTROL PANEL ASSEMBLY
Refer to Disassembly and assembly.
3. TOTAL ASSEMBLY
Page 34
EXPLODED VIEW AND PARTS LIST
1) KOR-631G1A/631H1A
REF NOPART CODEPART NAMEDESCRIPTIONQ'TYS UPPLY
A003511710300DOOR ASKOR-63150S1O
B003516721410CONTROL-PAN EL ASKOR-631G0A1O