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S/M No. : R630A0S002




Service Manual
Microwave Oven
Model: KOR-630A0S
KOR-860A0S
KOR-860A0N




DAEWOO ELECTRONICS CO., LTD.
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING
TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
(a) D o not operate or allow the oven to be operated with the door open.
(b) M ake the follow ing safety checks on all ovens to be serviced before activating the m agnetron or other m icrow ave
source, and m ake repairs as necessary: (1) Interlock operation, (2) Proper door closing, (3) Seal and sealing
surfaces (arcing, wear, and other dam age), (4) D am age to or loosening of hinges and latches, (5) Evidence of
dropping or abuse.
(c) Before turning on power to the m icrowave oven for any service test or inspection within the m icrowave generating
com partm ents, check the m agnetron, wave guide or transm ission line, and cavity for proper alignm ent, integrity,
and connections.
(d) Any defective or m isadjusted com ponents in the interlock, m onitor, door seal, and m icrowave generation and
transm ission system s shall be repaired, replaced, or adjusted by procedures described in this m anual before the
oven is released to the owner.
(e) A m icrowave leakage check to verify com pliance with the Federal perform ance standard should be perform ed on
each oven prior to release to the owner.






SAFETY AND PRECAUTIONS........................................................................................................... 2
FOR SAFE OPERATION.................................................................................................................. 2
FOR SAFE SERVICE PROCEDURES............................................................................................. 2
SPECIFICATIONS............................................................................................................................... 3
EXTERNAL VIEW ............................................................................................................................... 4
OUTER DIMENSION ........................................................................................................................ 4
FEATURE DIAGRAM........................................................................................................................ 5
CONTROL PANEL............................................................................................................................ 6
INSTALLATION .................................................................................................................................. 7
OPERATIONS AND FUNCTIONS ...................................................................................................... 8
DISASSEMBLY AND ASSEMBLY ..................................................................................................... 9
INTERLOCK MECHANISM AND ADJUSTMENT .............................................................................. 16
TROUBLE SHOOTING GUIDE........................................................................................................... 17
MEASUREMENT AND TEST.............................................................................................................. 21
MEASUREMENT OF THE MICROWAVE POWER OUTPUT.......................................................... 21
MICROWAVE RADIATION TEST..................................................................................................... 22
COMPONENT TEST PROCEDURE................................................................................................. 23
WIRING DIAGRAM ............................................................................................................................. 24
PRINTED CIRCUIT BOARD ............................................................................................................... 25
CIRCUIT CHECK PROCEDURE...................................................................................................... 25
PCB CIRCUIT DIAGRAM ................................................................................................................. 27
P.C.B. LOCATION NO...................................................................................................................... 28
EXPLODED VIEW AND PARTS LIST ................................................................................................ 29
DOOR ASSEMBLY........................................................................................................................... 29
CONTROL PANEL ASSEMBLY ....................................................................................................... 29
TOTAL ASSEMBLY .......................................................................................................................... 29

SAFETY AND PRECAUTIONS

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 APPLIANCE UNTIL YOU HAVE READ THIS SERVICE MANUAL.

2. FOR SAFE SERVICE PROCEDURES
1) If the oven is operative prior to servicing, a m icrowave em ission check should be perform ed prior to servicing the oven.
2) If any certified oven unit is found to servicing, a m icrowave em ission check should be perform ed prior to servicing the oven.
(a) inform the m anufacturer, im porter or assem bler,
(b) repair the unit at no cost to the ow ner,
(c) attem pt to ascertain the cause of the excessive leakage,
(d) tell the ow ner of the unit not to use the unit until the oven has been brought into com pliance.
3) If the oven operates with the door open, the service person should tell the user not to operate the oven and contact the
m anufacturer im m ediately.



IMPORTANT

The w ire in this m ains lead coloured in accordance w ith the following code.

G reen-and-yellow: E arth
B lue : N eutral
B row n : Live

A s the colours of the w ires in the m anins lead of this appliance m ay not correspond w ith the coloured m arkings
identifying the term inals in your plug, proceed as follow s.
The w ire which is coloured green-and-yellow m ust be connected to the term ianl in the plug which is m arked w ith
the letter `E' or by earth sym bol or green-and-yellow.
The w ire which is coloured blue m ust be connected to the term inal w hich is m arked w ith the letter `N ' or coloured black.
The w ire which is coloured brow n m ust be connected to the term inal w hich is m arked w ith the letter `L' or coloured red.




NOTE
This oven is designed for counter-top use only.




SPECIFICATIONS
KOR-630A

M ODEL K O R -630A 0S
P O W E R S U P P LY 230V, 50Hz, S IN G LE P HA S E W IT H EA RT H IN G
M IC RO W AVE 1200W
P O W E R C O N SU M PT IO N G R ILL

C O M B IN AT IO N
M IC R O W AV E EN E R G Y O U TP U T 800W
M IC R O W AV E FR E Q U EN C Y 2450M H z
O UT S ID E D IM EN S IO NS (W X H X D) 465 x 279 x 360 m m (18.3 x 11.0 x 14.2 in.)
C AV IT Y D IM E N S IO N S (W X H X D ) 290 x 220 x 306 m m (11.4 x 8.7 x 12.0 in.)
N ET W E IG H T A PP R O X. 13 K g ( 28.7 lbs.)
T IM E R 59 m in. 90 sec.
F UN C T IO N S E LE C T IO N S M IC R O W AV E
P O W E R S E LE CT IO N S 10 LE V ELS
C AV IT Y V O LU M E 0.7 C u.F t.




KOR-860A

M ODEL K O R-860A 0S K O R -860A 0N
P O W E R S U P P LY 230V, 50H z(860A 0S )/220V,50H z(860A 0N)
S IN G LE P H AS E W IT H E A RTH IN G
M IC RO W AVE 1350W 1250W
P O W E R C O N SU M PT IO N G R ILL
C O M B IN AT IO N
M IC R O W AV E EN E R G Y O U TP U T 900W
M IC R O W AV E FR E Q U EN C Y 2450M H z
O UT S ID E D IM EN S IO NS (W X H X D) 495 x 294 x 388 m m (19.5 x 11.6 x 15.3in.)
C AV IT Y D IM E N S IO N S (W X H X D ) 320 x 244 x 338 m m (12.6 x 9.6 x 13.3 in.)

N ET W E IG H T A P P R O X . 15 Kg ( 33.1 lbs.)
T IM E R 59 m in. 90 sec.
F UN C T IO N S E LE C T IO N S M IC R O W AV E
P O W E R S E LE CT IO N S 10 LE VE LS
C AV IT Y V O LU M E 0.9 Cu.F t.

S pecifications are subject to change w ithout notice.



EXTERNAL VIEW
1. OUTER DIMENSION

KOR-630A




465 360


279




KOR-860A




495
294





EXTERNAL VIEW



2. FEATURE DIAGRAM




1. DOOR SEAL
Door seal maintains 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 INTERLOCK 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 while
oven is operating, magnetron tube will immediately stop operating.

11. ROLLER GUIDE
Supports the glass cooking tray.



EXTERNAL VIEW



3. CONTROL PANEL




1. Time set pad - Used to set the cooking time and the present time.
2. Display - Cooking time, power level, indicators and present time are displayed.
3. One touch - Used to cook or reheat specific quantities of food.
4. Auto cook - Used to cook or reheat.
5. More - Used to add time to cooking.
6. Less - Used to remove time from cooking.
7. Auto Defrost - Used to defrost foods.(for weight)
8. Power - Used to set power level.
9. Defrost - Used to defrost foods.(for time)
10. Kitchen Timer - Used as a minute timer, delay cooking, hold setting after cooking.
11. Clock - Used to set clock.
12. Stop/Clear - Used to stop the oven operation or to delete the cooking data.
13. Start/easy cook - Used to start the oven and also used to set a reheat time.





INSTALLATION
1. Steady, flat location
This microwave oven should be set on a steady, flat surface.
This microwave oven is designed for counter top use only.

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 failure.

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.
Position the oven as far from them as possible.

4. Away from heating appliances and water taps
Keep the oven away from hot air, steam or splash when choosing a place to position it, or the insulation might be adversely
affected and breakdowns occur.

5. Power supply
Check your local power source.
This microwave oven requires a current of approximately 6amperes, 230 Volts, 50 Hz / 220Volts, 50Hz(KOR-860A0N).
Power supply cord is about 0.8 meters long.
The voltage used must be the same as specified on this oven. Using a higher voltage may result in a fire or other accident
causing oven damage. Using low voltage will cause slow cooking. We are not responsible for damage resulting from use
of this oven with a voltage of ampere fuse other than those specified.
This appliance is supplied with cable of special type, which, if damaged, must be repaired with cable of same type.
Such a cable can be purchased from DAEWOO and must be installed by a Qualified Person.

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.

7. Do not operate the oven if it is colder than room temperature
(This may occur during delivery in cold weather.) Allow the oven to become room temperature before operating.


EARTHING INSTRUCTIONS

This appliance must be earthed. In the event of an electrical short circuit, earthing reduces the risk of the electric shock by
providing an escape wire for the electric current. This appliance is equipped with a cord having a earthing wire with a earthing
plug. The plug must be plugged into an outlet that is properly installed and earthed.


WARNING

Im proper use of the earthing plug can result in a risk of electric shock. C onsult a qualified electrician or servicem an if
the earthing instructions are not com pletely understood, or if doubt exists as to whether the appliance is properly
earthed, and either : If it is necessary to use an extension cord, use only a 3-w ire extension cord that has a 3-blade
earthing plug, and a 3-slot receptacle that w ill accept the plug on the appliance. The m arked rating of the extension
cord should be equal to or greater than the electrical rating of the appliance, or Do not use an extension cord.




OPERATIONS AND FUNCTIONS
1. Connect the m ain 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 m ust always
be in place during cooking.
3. Close the door securely.
4. W hen the oven door is opened, the light turns off.
5. The oven door can be opened at any tim e during operation by touching the door release button on the control panel.
The oven will autom atically shut off. To restart the oven, close the door and then touch START.
6. Each tim e a pad is touched, a BEEP will sound to acknowledge the touch.
7. The oven autom atically cook on full power unless set to a lower power level.
8. The display will show :0 when the oven is plugged in.
9. Tim e clock returns to the present tim e when the cooking tim e ends.
10. W hen the STOP/CLEAR pad is touched during the oven operation, the oven stops cooking and all inform ation retained.
To erase all inform ation (except the present tim e), touch the STOP/CLEAR pad once m ore. If the oven door is opened
during the oven operation, all inform ation is retained.
11. If the START pad is touched and the oven does not operate, check the area betw een the door and door is closed
securely. The oven will not start cooking under the door is com pletely closed or the program has been reset.



M ake sure the oven is properly install


Variable power cooking
On and OFF cycle time of mechanical V.P.C switch is 30 seconds.
When the V.P.C knob is set to the desired position and timer knob turns to the desired position, the V.P.C switch has a cycle
(ON/OFF time(sec.)) listed below.

TOUCH POW ER PAD. POW ER LEVEL (DISPLAY) APPROXIMATE PER CENTAGE O F POW ER
O nce P -HI 100 %
Tw ice P -90 90 %
3 tim es P -80 80 %
4 tim es P -70 70 %
5 tim es P -60 60 %
6 tim es P -50 50 %
7 tim es P -40 40 %

8 tim es P -30 30 %
9 tim es P -20 20 %
10 tim es P -10 10 %
11 tim es P -00 0%





DISASSEMBLY AND ASSEMBLY
Cautions to be observed when trouble shooting
Unlike many other appliances, the microwave oven is high-voltage, high-current equipment.
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 earthed.
Do not operate on a two-wire extension cord.
The microwave oven is designed to be used with earthed.
It is imperative, therefore, to makes sure it is earthed 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 12A 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
S ervice personnel should rem ove their watches w henever w orking close to or replacing the m agnetron.




WARNING
W hen servicing the appliance, need a care of touching or replacing high potential parts because of electrical shock or
exposing m icrow ave. These parts are as follows - H V Transform er, M agnetron, H V C apacitor, H V D iode, H V Fuse.





DISASSEMBLY AND ASSEMBLY



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 assembly.

NOTE
A fter replacing the door assem bly, perform a check of
correct alignm ent with the hinge and cavity front plate.



3. To remove door parts




D O O R A S S E M B LY
: 3511710320(K O R -630A )
: 3511710720(K O R -860A )

KOR-630A
REF. NO PART COD E PART NA ME DESC RIPTIO N Q 'TY REMARK
A01 3512203810 FRAM E DOOR A BS X R -401 H -2938 1
A02 3517003050 B A R R IE R -S CR E E N*O A CRY L 1
A03 3515304610 S U P P O RT E R B AR R -S*O PP 1
A04 3515204100 S TO P P E R H IN G E *T AS K O R -63150S 1
A05 3511705500 D O O R W E LD A S K O R -61150S 1
A06 3517002800 B A R R IE R -S CR E E N *I P O LY E S T ER T 0.1 1
A07 3512300200 G A S K ET D O O R PP 1
A08 3513100700 HOOK POM 1
A09 3515101300 S P R ING H O O K PW1 1




DISASSEMBLY AND ASSEMBLY



KOR-860A
REF. NO PART CO DE PAR T NAME DESCRIPTION Q'TY REMA RK
A01 3512204110 FR A M E D O O R A BS X R -401 H -2938 1
A02 3517003150 BA R R IER -S C RE E N *O A CR YL T 1.5 1
A03 3515304410 SU P P O R TE R B AR R -S *O PP 1
A04 3515204100 ST OP P E R H IN G E *T A S K O R -63150S 1
A05 3511705620 DO O R W E LD A S K O R -81250S 1
A06 3517002900 BA R R IER -S C RE E N *I P O LYE S T E R T 0.1 1
A07 3512300400 GA S K E T D O O R PP 1
A08 3513100700 HO O K POM 1
A09 3515101300 SP R IN G H O O K PW1 1


1) Remove the gasket door from door weld AS.
2) Remove the barrier screen inner from door weld AS.
3) Remove the door frame from door weld AS.
4) Remove the stopper hinge top from door weld AS.
5) Remove the spring and the hook.
6) Remove the supporter barrier screen outer from door frame.
7) Remove the barrier screen outer from door frame.
8) Reverse the above steps for reassembly.

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.
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 sm all gap m ay be acceptable if the m icrow ave leakage does not exceed 4m W /cm 2 .





DISASSEMBLY AND ASSEMBLY



5. To remove control panel pats.




C O N TR OL PAN E L A S S E M B LY
: P K C P S W ZE 00(K O R -630A )
: P K C P S W N E 00(K O R -860A )




KOR-630A
REF.NO PART CO DE PART NAM E DES CRIPTION Q'TY REMA RK
B 01 3518521100 SW IT CH M E M B R A NE K O R -630A 0S 1
B 02 3516719410 CO N T RO L-PA NE L A B S XR -401 H -2938 1
B 03 P K M PM S Z A 00 PC B M A IN A S K O R -631H 0S 1
B 04 7122401211 SC R E W TA P P ING T 2S TR S 4x12 M F ZN 4
B 05 3513702710 LE V E R D O O R O P E N A B S XR -401 H -2938 1
B 06 441G 430171 SP R ING B U TT O N S W P DIA 0.7 1
B 07 3516906910 BU T TO N D O O R O P E N A B S XR -401 H -2938 1

KOR-860A

REF.NO PA RT CODE PAR T NAME DESCR IPTIO N Q 'TY REMA RK
B 01 3518521300 S W ITC H M E M B R AN E KO R -860A 0S 1
B 02 3516720210 C O NT R O L-PAN E L A B S X R -401 H -2938 1
B 03 P K M P M S ZA 00 P C B M A IN AS K O R-631H 0S 1
B 04 7122401211 S C R EW TA P PIN G T 2S TR S 4x12 M FZ N 4
B 05 3513702710 LE V ER D O O R O P EN A B S X R -401 H -2938 1
B 06 441G 430171 S P R IN G B UT TO N S W P D IA 0.7 1
B 07 3516906910 B U T TO N D O O R O PE N A B S X R -401 H -2938 1



DISASSEMBLY AND ASSEMBLY



1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assem bly.
2) Rem ove the door open lever from the control panel.
3) Rem ove four screws which secure the PCB assem bly to control panel.
4) Disconnect m em brane tail from the conector of the PCB assem bly.
5) Detach m em brane from the control panel.
6) Rem ove the 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 reassembly.




High voltage circuit wiring





DISASSEMBLY AND ASSEMBLY



7. To remove magnetron.

1) Remove a screw which secure the magnetron.
2) Remove the magnetron.
3) Reverse the above steps for reassembly.




NOTE

N ever install the m agnetron w ithout the m etallic gasket plate w hich is packed w ith each m agnetron to prevent
m icrow ave leakage. W henever repair w ork is carried out on m agnetron, check the m icrow ave leakage. It shall not
exceed 4m W /cm 2 for a fully assem bled oven w ith door norm ally closed.





DISASSEMBLY AND ASSEMBLY



8. To remove wind guide assembly.

1) Remove a screw for earthing.
2) Remove the noise filter from the wind guide.
3) Remove a screw which secure the wind guide assembly.
4) Draw forward the wind guide assembly.
5) Pull the fan from the motor shaft.
6) Remove two screws which secure the motor shaded pole.
7) Remove the motor shaded pole.
8) Reverse the above steps for reassembly.




9. To remove H.V.transformer.

1) Remove four screws holding the H.V.transformer.
2) Remove the H.V.transformer.
3) Reverse the above steps for reassembly.





INTERLOCK MECHANISM AND ADJUSTMENT
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 microwave.

1. Primary interlock switch
When the door is closed, the hook locks
the oven door. If the door is not closed properly,
the oven will not operate. When the door is closed,
the hook pushes the button of the microswitch.
Then the button of the primary interlock switch bring
it under "ON" condition.

2. Secondary interlock 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 switch to bring it under "OFF" condition
and presses the button of the secondary interlock switch
to bring it under "ON" condition.




ADJUSTMENT

Interlock monitor switch
W hen the door is closed, the interlock m onitor sw itch should be opened before other sw itches are closed.
W hen the door is opened, the interlock m onitor sw itch should be closed after other switches are opened.




3. Adjustment steps
(a) Loosen the one mounting screw.
(b) Adjust interlock switch assembly position.
(c) Make sure that lock lever moves smoothly after adjustment is completed.
(d) Tighten completely one mounting screw.

NOTE

M icrow ave em ission test should be perform ed after adjusting interlock m echanism .
If the m icrow ave em ission exceed 4m W /cm 2 , readjust interlock m echanism .





TROUBLE SHOOTING GUIDE
Following the procedure below to check if the oven is defective or not

1. Check grounding before checking trouble.
2. Be careful 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 then check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter.

NOTE
W hen electric parts are checked, be sure the pow er cord is not inserted the w all outlet.
"C heck wire harness, wiring and connected of the term inals and pow er cord before check the parts listed below.




(TROUBLE 1) Door shut, timer set, but no cooking takes place.


CO NDITION CH ECK RE SU LT CA US E RE M ED Y

F use blow s. C heck continuity of (C O M <-> NC ) M alfunction R eplace
interlock m onitor sw itch C ontinuity of inte rlock NOTE 1
w ith door closed m onitor
(C O M <-> NC ) (C O M <-> NC ) sw itch
N o C ontinuity


C heck continuity of b oth No M alfunction R eplace
prim ary and secondary C ontinuity of inte rlock NOTE 1
interlock switch w ith sw itch
door closed C ontinuity



C ontinuity Sho rted R eplace
C heck continuity of
prim ary in terlock sw itch contacts of NOTE 1
contact w ith door prim ary
partially open until interlock
interlock m onitor sw itch sw itch
contact clo se
(C O M <-> NC close)


C heck continuity of 0 or infinite D efective low R eplace
prim ary w inding of low voltage
voltage transform er App rox. transform er
150~310
(norm al)


D isconnect high voltage F use again D efective R eplace
fuse a nd operate the unit blow s high voltage
transform er





TROUBLE SHOOTING GUIDE




CON DITION CHECK RESULT CAUSE REM EDY

O utlet has C heck con tinuity of No D efective R eplace
proper voltage m agn etron C ontinuity m agn etron
Fuse does not
blow. C heck con tinuity of noise No D efective R eplace
filter board C ontinuity noise filter board


C heck con tinuity of No O pen pow er A djust
pow er supply cord C ontinuity supply cord

N orm al D efective A djust
touch control
circuit



NOTE
A ll these sw itches m ust be replaced at the sam e tim e, please refer to "Interlock M echanism A nd A djustm ent".




(TROUBLE 2) Display shows all figures selected, but oven does not start cooking, even though desired
program and time are set and start pad is tapped.


CON DITION CHE CK RES ULT CAU SE REM EDY

G rill heater is C heck contin uity of No M alfu nction A dju st or
not h eated. prim ary interlock sw itch C ontinuity of prim ary R eplace
interlock sw itch


C heck contin uity of No M alfu nction A dju st or
seco ndary interlock an d C ontinuity of se condary R eplace
D .O .M . sw itch interlock and
D .O .M . sw itch


C heck D .C. voltage 0V D efe ctive R eplace
being supplie d to touch control
R EL AY (R Y2 ) coil circu it


A pprox Faulty R eplace
15 V D C conta cts of
R EL AY
(RY 2 ) or open
relay coil




TROUBLE SHOOTING GUIDE



(TROUBLE 3) N o m icrowave oscillation even though fan m otor rotates.

C O N DITIO N C H EC K R E SU LT C A US E R E M ED Y

N o m icrow ave C heck co ntinu ity of h igh No
osc illation voltage fuse C on tinuity

R eplace high vo lta ge fuse


C heck co ntinu ity of h igh C on tinuity D efective R ep la ce
voltage ca pacito r high voltage
term ina ls w ith w ires transfo rm er
rem ove d


C heck co ntinu ity of h igh C on tinuity in D efective R ep la ce
voltage rectifier in ba ckw ard high voltage
forw a rd a nd backw a rd direction rectifier
direction w ith D C
m eg ger


C onn ect m eg ger le ads to C on tinuity D efective R ep la ce
m ag netron te rm in al and m a gne tro n
m ag netron bod y


C heck resistance o f 0 or D efective R ep la ce
prim ary a nd seco n da ry high voltage
coil of high volta ge transfo rm er
tra nsform er


C heck co ntinu ity of No D efective R ep la ce
m ag netron w ith w ire s C on tinuity m a gne tro n
rem ove d


C heck co ntinu ity of No D efective R ep la ce
filam ent te rm inal of h igh C on tinuity high voltage
voltage transform er transfo rm er


C heck D .C . v oltag e 0V D efective R ep la ce
be ing su pplie d to tou ch co ntrol
R E L AY (R Y 3) coil circuit

A pp ro x F aulty R ep la ce
13 VD C co ntacts o f
R E LAY
(R Y3) o r o pe n
relay co il




TROUBLE SHOOTING GUIDE



( TROUBLE 4 ) The follow ing visual conditions indicate a probable defective touch control circuit
or m embrance sw itch assem bly.
1. Incomplete segments,
1) Segments missing.
2) Partical segments missing.
3) Digit fickering other than normal fluorescent 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. g


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 when 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 while counting down.

9. Display counts down noticeably too fast while cooking.

10. Display does not show the time of day when clear pad is touched.

11. Oven lamp and turntable motor do not stop although cooking is finished. Check if the RELAY 2 contacts close if they are
close, replace touch control circuit.




CON DITION CHECK RESULT CAUSE REM EDY

D isplay does C heck each button for N orm al M alfunction R eplace
not show continuity of the button of touch control box
program m ing keyboard for the control circuit sub-a ssem bly
at all, even if following keyboard of control box
keyboard is check procedure sub-a ssem bly
touched.

N orm al M alfunction R eplace
of botton the button
keyboard keyboard




NOTE
B efore following the particular steps listed above in the rtouble shooting guide for the m em brane keyborad's, failure,
please check for the continuity of each w ire-harm ess betw een the m em brane keyboard and P.C.B . assem bly.





MEASUREMENT 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 microwave as directed below.

PR O CED U R E
1. Microwave power output measurement is made with the microwave oven supplied at rated voltage and operated at its
maximum microwave power setting with a load of 1000 5cc of potable water.
2. 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.
3. 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 (50 3.6 F). 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 center of the shelf, which is in the lowest normal position.
4. Microwave power is switched on.
5. Heating time should be exactly A seconds (Refer to table as following).
Heating time is measured while the microwave generator is operating at
full power. The filament heat-up time for magnetron is not included.
6. The initial and final temperature of water is selected so that the maximum
difference between the ambient and final water temperature is 5K.
7. The microwave power output P in watts is calculated from the following
formula:


P = 4187 x T/ t
T is difference between initial and ending temperature.
t is the heating time.
The power measured should be B (Refer to 2. SPECIFICATIONS) W 10.0 %.


CAUTION

1. W ater load should be m easured exactly to 1 liters.
2. Input pow er voltage should be exactly specified voltage (Refer to 2. S P E CIFIC ATIO N S ).
3. A m bient tem perature should be 20 2 C (68 3.6 F)



Heating time for power output:
A (second) 70 64 60 56 52 49 47 44 42 40 38
B (W ) 600 650 700 750 800 850 900 950 1000 1050 1100





MEASUREMENT AND TEST



2. MICROWAVE RADIATION TEST

WARNING

M ake sure to check the m icrowave leakage before and after repair of adjustm ent.
A lways start m easuring of an unknow n field to assure safety for operating personnel from m icrow ave energy.
D o not place your hands into any suspected m icrow ave radiation field unless the safe density level is know n.
C are should be taken not to place the eyes in direct line w ith the source of m icrow ave energy.
Slowly approach the unit under test until the radiometer reads an appreciable microwave leakage from the unit under the test.



PR O CED U R E
1. Prepare Microwave Energy Survey Meter,600cc glass beaker, and glass
thermometer 100C (212F ).
2. Pour 275cc 15cc of tap water initially at 20 5 C (68 9F) in the 600cc
glass beaker with an inside diameter of approx. 95 mm(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 2450MHz.
(1) Measured radiation leakage must not exceed the value prescribed below.
Leakage for a fully assembled oven with door normally closed must be
less than 4mW/cm2.
(2) When measuring the leakage, always use the 5 cm (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, move 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 may result.





MEASUREMENT AND TEST



3. COMPONENT TEST PROCEDURE
High voltage is present at the high voltage terminal of the high voltage transformer 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 winding ... Approx. 110 10%

Filament winding ... Approx. 0

Primary winding ... Approx. 1

2. High voltage capacitor
(1) Check continuity of capacitor with meter on the highest OHM scale.
(2) A normal capacitor will show continuity for a short time, and then indicate 10M once the capacitor charged.
(3) A shorted capacitor will show continuous continuity.
(4) An open capacitor will show constant 10M .
(5) Resistance between each terminal 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 terminals. 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 complete magnetron diagnosis, refer to "Measurement of the Microwave Output Power." Continuity checks can only
indicate and open filament or a shorted magnetron.
To diagnose for an open filament or a shorted magnetron,
(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 blown 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 switches operate normally.





WIRING DIAGRAM





PRINTED CIRCUIT BOARD
1. CIRCUIT CHECK PROCEDURE

1) Low voltage transformer check
The low voltage transform er is located on the P.C.B.
M easuring condition: Input voltage: 220~230 V / Frequency: 50Hz


Term inal Voltage LO AD N O LO A D
4-7 A C 12.6 V A C 14.7 V


NOTE

1. Refer to Circuit Diagram (point 4).
2. Secondary side voltage of the low voltage rtansformer changes in proportion to fluctuation of power source voltage.
3. The allowable tolerance of the secondary voltage is within 5% of nom inal voltage.

2) Voltage Check
- Key check point

NO CHECK POINT REMARK
1 IC1 P IN 2,21,30,34 -5VD C
2 IC1 P IN 35



T : 20 m s(50Hz)


3 IC1 P IN 31 O R 32



T : 250 ns(4M Hz)


- Check m ethod

NO MEASURE POINT WAVE FORM REMEDY REM ARK
1 MP1 D C -5V 0.25V Replace V L1, E C1, Z D2 N O LO A D
2 MP2 D C -12V 2.0V Replace E C 2, D12,13,14 N O LO A D



NOTE

Each m easure point m ust be m easured with GND points.





PRINTED CIRCUIT BOARD



3) W hen there is no microwave oscillation

(1) W hen touching START pad, oven lam p does not turn on.
Fan m otor do not rotate, but cook indicator in display com es on.
Cause : RELAY 2 does not operate. refer to Circuit Diagram ( Point 3 )
- Check m ethod

P OINT
A B
STATE
RELA Y 2 O N - 5V DC GND
RELA Y 2 O F F GND - 12V DC

(2) W hen touching START pad, oven lam p turns on.
Fan m otor and turntable rotate and cook indicator in display com es on.
Cause : RELAY 2 does not operate. refer to Circuit Diagram ( Point 2 )
- Check m ethod

POINT
A B
STATE
R ELA Y 1 O N -5VD C G ND
RELA Y 1 O FF G ND -12VD C



4) W hen the door is opened during operation, the Count down timer does not stop.
refer to Circuit Diagram ( Point 1 )
- Check m ethod

POINT
A B
STATE
D O O R O PE N O P EN -5V DC
D O O R C LO S E D C LO SE GND



CHECK N O METHOD REM EDY
C heck the stage(O N,O FF ) of the secondary interlock switch by resistance Replace secondary interlock switch.
1
m easurem ent.


5) W hen the digital clock does not operate properly.
refer to Circuit Diagram ( Point 5 )
POINT WAVE FORM



A T: 20 m s(50H z)




If clock does not keep exact tim e, you m ust check resistor R15,16, zener diodeZD1.

PRINTED CIRCUIT BOARD



2. PCB CIRCUIT DIAGRAM





PRINTED CIRCUIT BOARD



3. P.C.B. LOCATION NO.
NO NAM E SYM BOL SP ECIFIC ATION PART CODE Q 'TY
1 B UZ Z E R B Z1 B M -20K 3515600100 1
2 C AR R AY CA 1 7P(6) 102 M 50V CN 6X B-102M 1
3 C APAC ITO R ELE C E C1 16V R S S 100uF CE X F 1C 101V 1
4 C APAC ITO R ELE C E C2 25V R S S 1000uF C E X F 1E 102V 1
5 C O N N E CT O R W A F E R CN 1 Y W 396-02AV 3519150520 1
6 C O N N E CT O R W A F E R CN 2 Y W 396-05AV 3519150510 1
7 C O N N E CT O R W A F E R CN 3 F CZ 254-11 441M 367160 1
8 D IO D E R EC T IF Y D1~6,9~12 1N4148 D Z N 4148--- 10
9 D IO D E R EC T IF Y D13,14 1N4002A D Z N 4002A -- 2
10 D IO D E Z EN E R Z D1 M TZ 5.1VB 1/2W D Z T Z 5R 1B -- 1
11 D IO D E Z EN E R Z D2 M TZ 3.9VB 1/2W D Z T Z 3R 9B -- 1
12 LE D D IS PLAY DP 1 D DG -631H DD D G 631H -- 1
13 P CB M A IN M 158 81.5X 139.9 3514315410 1
14 R AR R AY RA 1 7P(6) 1/8 100K J R A -87X 104J 1
15 R ES IS TO R R1~R 7 1/6W 330 5% R D -A Z331J- 7
16 R ES IS TO R R8,10,12,14,22 1/6W 1K 5% R D -A Z102J- 5
17 R ES IS TO R R11,20,21 1/6W 100K 5% R D -A Z104J- 3
18 R ES IS TO R R13 1/6W 100 5% R D -A Z101J- 1
19 R ES IS TO R R15~17 1/6W 10K 5% R D -A Z103J- 3
20 R ES IS TO R R18 1/6W 1M 5% R D -A Z105J- 1
21 R ES IS TO R R19 1/4W 51 5% R D -4Z510J- 1
22 R EG U LATO R V L1 M C7905C 1M C 7905C -- 1
23 T RA N S IS TO R Q 1~5,9~11 K RA -102M T Z R A 102M -- 8
24 T RA N S IS TO R Q6 K TA -1270Y T ZTA 1270Y- 1
25 T RA N S P O W E R LV T 1 D M R -631P 5E P U 035302 1
26 IC M IC O M IC1 T M P 47C 440B N -N F 94 13G S 371G H 0 1
27 R ES O N ATO R CE R A CR 1 K BR -4.0M S T F 5P K B R40M K S 1
28 S W R E LAY RY 1 G 5G -1A DC 12V 5SC 0101121 1
29 S W R E LAY RY 2 G 5B -1 D C12V 5S C0101110 1
30 C APAC ITO R CE R A C6 102 50V Z A X IA L CC Z F 1H 102Z 1
31 C APAC ITO R CE R A C1~5,C 7 104 50V Z A X IA L CC Z F 1H 104Z 6





EXPLODED VIEW AND PARTS LIST

1. DOOR ASSEMBLY
Refer to Disassem bly and assem bly.

2. CONTROL PANEL ASSEMBLY
Refer to Disassem bly and assem bly.

3. TOTAL ASSEMBLY





EXPLODED VIEW AND PARTS LIST



KOR-630A0S
REF NO. PART CODE PART NAME DESCRIPTION SUPPLY REMARK
A00 DOOR AS Refer to disassem bly and assembly O
B00 CONTROL-PANEL AS Refer to disassem bly and assembly O
F01 3510801310 CABINET PCM T0.6 GE O
F02 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN O
F03 3516019000 CAVITY W ELD AS CAVITY W ELD AS O
3516109600 CAVITY JOINT AS CAVITY JOINT AS O
F04 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN O
F05 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN O
F06 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN O
F07 35113AEQ0D CORD POW ER AS 3X0.75 70X70 100-RTM L O
F08 4413A90012 CLAM P POW ER CORD NYLON66 O
F09 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN O
F10 7122401211 SCREW TAPPING T2S TRS 4X30 MFZN O
F11 4415D67620 FUSE 250V 12A 65TS O
4415D67120 FUSE 250V 12A M DA O
F12 3518606200 FILTER NOISE DW LF-M 12 O
F13 7121403011 SCREW TAPPING T2S PAN 4X30 M FZN O
F14 3512517000 GUIDE W IND PP O
F15 3963513100 M OTOR SHADE POLE 230V 17W OEM -10DW C2-A07 O
3963512310 M OTOR SHADE POLE 230V 20W M W 10C A-M 02 O
F16 3511800300 FAN PP+30%GLASS O
F17 3518002200 M AGNETRON 2M 218H(MF) I O
F18 3516004000 SPECIAL SCREW T2 BOLT FLANGE 5X12 DACRO O
F19 7272400811 SCREW TAPTITE TT3 TRS 4X8 M FZN O
F20 3513003200 HOLDER HV CAPACITOR SECC T0.6 O
F21 3518302200 CAPACITOR HV 2100VA C 0.98F # 187 O
F22 3518400400 DIODE HV HVR-1X-3AB 12KV #187 O
F23 3518701100 FUSE HV 5KV 0.55A HV-41A55-02 O
F24 3518113700 TRANS HV DY-N80S0-63T O
F25 3516003700 SPECIAL SCREW TT3 FLG HEX 4X8 M FZN O
F26 3510311700 BASE SBHG T0.8 O
F27 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN O
F28 3512100900 FOOT PP DASF-130 O
F29 7272400811 SCREW TAPTITE TT3 TRS 4X8 M FZN O
F30 3515201101 STOPPER HINGE *U SCP-1 T2.5 O
F31 4415A17352 SW MICRO VP-533A-OF SPNO #187 200G O
F32 4415A66910 SW MICRO VP-531A-OF/SZM-V16-FA-61 O
F33 4415A17352 SW MICRO VP-533A-OF SPNO #187 200G O
F34 4415A17352 SW MICRO VP-533A-OF SPNO #187 200G O
F35 3513702600 LEVER LOCK POM O
F36 3513811700 LOCK POM O
F37 3513601600 LAM P BL 240V 25W T25 C7A H187 O
F38 7121400611 SCREW TAPPING T2S PAN 4X6 MFZN O
F39 3966310100 M OTOR SYNCRO 220V 2.5W GM -16-24FD12 O
3966310110 M OTOR SYNCRO 220V 2.5W M 2LJ49ZT52 O
F40 3518905300 THERM OSTAT OFF:75 ON:65 H #187 NB O
F41 3513003400 HOLDER THERM OSTAT PBT O
F42 7272400811 SCREW TAPTITE TT3 TRS 4X8 M FZN O
F43 3511406200 COVER WAVE GUIDE HEATPR OOF PP O
F44 3517400620 COUPLER XAREC O
F45 3514700710 ROLLER TEFRON O
F46 3512517300 GUIDE ROLLER PP 5113MF6 A353B O
F47 3517203600 TRAY GLASS O




EXPLODED VIEW AND PARTS LIST


KOR-860A0S / KOR-860A0N
REF NO. PART CODE PART NAME DESCRIPTION SUPPLY REM ARK
A00 DOOR AS Refer to disassembly and assem bly O
B00 CONTROL-PANEL AS Refer to disassembly and assem bly O
F01 3510801400 CABINET PCM T0.6 O
F02 7112401011 SCREW TAPPING T1 TRS 4X10 M FZN O
F03 3516109200 CAVITY W ELD AS CAVITY W ELD AS O
3516109700 CAVITY JOINT AS CAVITY JOINT AS O
F04 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN O
F05 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN O
F06 7112401011 SCREW TAPPING T1 TRS 4X10 M FZN O
F07 35113AEQ0D CORD POW ER AS 3X0.75 70X70 100-RTM L O
F08 4413A90012 CLAMP POW ER CORD NYLON66