S/M No. : R631G0P001

Service Manual

Microwave Oven

Model: KOR-631G0P KOR-631H0P KOR-861G0P KOR-861H0P

Caution

: In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information,please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr).
DAEWOO ELECTRONICS CO., LTD.
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
(a) Do not operate or allow the oven to be operated with the door open. (b) M ake the following safety checks on all ovens to be serviced before activating the m agnetron or other m icrowave 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) Dam age to or loosening of hinges and latches, (5) E vidence of dropping or abuse. (c) Before turning on power to the m icrow ave 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
1. FOR SAFE OPERATION.... 2 2. FOR SAFE SERVICE PROCEDURES.... 2
SPECIFICATIONS.... 3 EXTERNAL VIEW..... 4
1. OUTER DIMENSION.... 4 2. FEATURE DIAGRAM.... 5 3. CONTROL PANEL.... 6
INSTALLATION..... 8 OPERATIONS AND FUNCTIONS... 9 DISASSEMBLY AND ASSEMBLY.... 10 INTERLOCK MECHANISM AND ADJUSTMENT... 17 TROUBLE SHOOTING GUIDE.... 18 MEASUREMENT AND TEST.... 22
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT.. 22 2. MICROWAVE RADIATION TEST.... 23 3. COMPONENT TEST PROCEDURE... 24
WIRING DIAGRAM.... 25 PRINTED CIRCUIT BOARD.... 26
1. CIRCUIT CHECK PROCEDURE... 26 2. P.C.B. CIRCUIT DIAGRAM.... 29 3. P.C.B. LOCATION NO.... 30
EXPLODED VIEW AND PARTS LIST.... 32
1. DOOR ASSEMBLY.... 32 2. CONTROL PANEL ASSEMBLY.... 32 3. TOTAL ASSEMBLY.... 32

SAFETY AND PRECAUTIONS

1. FOR SAFE OPERATION
D am age that allow s the m icrow ave energy (that cooks or heats the food) to escape w ill result in poor cooking and m ay cause serious bodily injury to the operator. IF A N Y O F TH E FOLLO W IN G CO N D ITIO N S E X IS T, O P E RATO R M U S T N O T US E TH E A P P LIA N C E. (O nly a trained service personnel should m ake repairs.) 1) A broken door hinge. 2) A broken door view ing 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. N o grease, soil or spatter should be allow ed to build up on these surfaces or inside the oven. D O N OT ATTE M PT TO O P E R ATE THIS A P P LIA N CE W ITH TH E D O O R O P EN. The m icrow ave oven has concealed sw itches to m ake sure the power is turned off w hen the door is opened. D o not attem pt to defeat them. D O N OT ATTE M PT TO S E RV IC E TH IS A P P LIA N C E U N TIL Y O U H AVE R E A D THIS S E RV IC E M A NU A L.

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 follow ing 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 w hich is coloured green-and-yellow m ust be connected to the term ianl in the plug w hich is m arked with the letter E , earth sym bol or coloured green-and-yellow. The w ire w hich is coloured blue m ust be connected to the term inal which is m arked w ith the letter N or coloured black. The w ire w hich 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.
This oven is designed for counter-top use only.

SPECIFICATIONS

M O D EL PO W E R SU P PLY M IC R O W AVE PO W E R C O N SU M PTIO N G R ILL C O M BIN ATIO N M IC R O W AVE E N E R G Y O U TP U T M IC R O W AVE F R E Q U E N C Y O U T S ID E D IM EN SIO N S (W X H X D ) C AV IT Y D IM E N S IO N S (W X H X D ) N E T W E IG H T TIM ER FU N C T IO N S ELE C T IO N S PO W E R SE LE C T IO N S C AV IT Y VO LU M E

KO R -631G /H

KO R -861G /H
220V -60H z, SIN G LE PH AS E W ITH E AR TH IN G 1200W 1300W
800W 2450M H z 465 x 279 x 360m m (18.3 x 11.0 x 14.2 in.) 290 x 220 x 306 m m (11.4 x 8.7 x 12.0 in.) A PP R O X. 13Kg ( 28.7lbs.)
495 x 294 x 388m m (19.5 x 11.6 x 15.3 in.) 320 x 244 x 338m m (12.6 x 9.6 x 13.3 in.) AP PR O X. 15Kg ( 33.1lbs.)

59 m in. 90 sec. M IC R O W AV E 10 LE VE LS 0.7 C u.Ft. 0.9 C u.Ft.
SPECIFICATIONS ARE SUBJECT TO CHANGE W ITHOUT NOTICE.

EXTERNAL VIEW

1. OUTER DIMENSION (KOR-631/861)

465/495

360/388

279/294

Fig.1 Front View

Fig.2 Side View

2. FEATURE DIAGRAM
1. DOOR SEAL Door seal m aintains the m icrowave within the oven cavity and prevents m icrowave leakage. 2. DOOR HOOK W hen door is closed, it will autom atically lock shut. If door is opened while oven is operating, m agnetron tube will im m ediately stop operating. 3. DOOR SCREEN Allows viewing of food. M icrowave cannot pass through perforations in screen. 4. SPATTER SHIELD Protects the m icrowave outlet from splashes of cooking foods. 5. OVEN LAMP Autom atically turns on during oven operating. 6. SAFETY INTERLOCK SYSTEM 7. CONTROL PANEL 8. GLASS COOKING TRAY M ade of special heat resistant glass. The tray m ust 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. W hen door is closed, it will autom atically lock shut. If door is opened while oven is operating, m agnetron tube will im m ediately stop operating. 11. ROLLER GUIDE Supports the glass cooking tray.

3. CONTROL PANEL

(1) KOR-631G/861G
1. Time set pad - Used to set the cooking tim e and the present tim e. 2. Display - Cooking tim e, power level, indicators and present tim e 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 tim e to cooking. 6. Less - Used to rem ove tim e 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 tim e) 10. Kitchen Tim er - Used as a m inute tim er, 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/Speedy cook - Used to start the oven and also used to set a reheat tim e.

(2) KOR-631H/861H

1. Time set pad - Used to set the cooking tim e and the present tim e. 2. Display - Cooking tim e, power level, indicators and present tim e are displayed. 3. One touch - Used to cook or reheat specific quantities of food. 4. More - Used to add tim e to cooking. 5. Less - Used to rem ove tim e from cooking. 6. Auto Defrost - Used to defrost foods.(for weight) 7. Power - Used to set power level. 8. Defrost - Used to defrost foods.(for tim e) 9. Kitchen Timer - Used as a m inute tim er, delay cooking, hold setting after cooking. 10. Clock - Used to set clock. 11. Stop/Clear - 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 tim e.

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 installed and plugged into the electrical outlet.
W attage output chart The power level is set by pressing the Power pad. The chart shows the display, the power level and the percentage of power.

Touch Power pad.

O nce Tw ice 3 tim es 4 tim es 5 tim es 6 tim es 7 tim es 8 tim es 9 tim es 10 tim es 11 tim es

Pow er level (Display)

P -H I P -90 P -80 P -70 P -60 P -50 P -40 P -30 P -20 P -10 P -00
Approximate Percentage of Pow er
100 % 90 % 80 % 70 % 60 % 50 % 40 % 30 % 20 % 10 % 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 w atches w henever working close to or replacing the m agnetron.
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 follow s - H V Transform er, M agnetron, H V C apacitor, HV D iode.

1. To rem ove cabinet

1) Rem ove three screws on cabinet back. 2) Push the cabinet backward.
.2. To rem ove door assem bly 1) Rem ove a screw which secure the stopper hinge top. 2) Rem ove the door assem bly from top plate of cavity. 3) Reverse the above for reassem bly.
A fter replacing the door assem bly, perform a check of correct alignm ent with the hinge and cavity front plate.
Caution: In this Service Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the
latest parts information, please refer to PPL(Parts Price List) in Service information Center(http://svc.dwe.co.kr)
3. To rem ove door parts.
DO OR A SSEMB LY : 3511710300(K O R-631) 3511710700(K O R-861)

(1) KOR-631G/631H

REF. NO
A 01 A 02 A 03 A 04 A 05 A 06 A 07 A 08 A 09

PA RT CODE

3515101300

PART N AME

FR A M E D O O R BA R R IER -S C RE E N *O SU P P O RTE R B AR R -S *O ST OP P E R H IN G E *T A S DO O R W E LD A S BA R R IER -S C RE E N *I GA S K E T D O O R HO O K SP R IN G H O O K

DESCRIPTION

A BS X R -401 H -2938 A CRY L PP K O R -63150S K O R -61150S P O LY E S T ER T 0.1 PP POM PW1

REMARK

(2) KOR-861G/861H
A BS X R -401 H -2938 A CRY L PP K O R -63150S K O R -81250S P O LY E S T ER T 0.1 PP POM PW1
1) Rem ove 2) Rem ove 3) Rem ove 4) Rem ove 5) Rem ove 6) Rem ove 7) Rem ove 8) Reverse
the gasket door from door weld as. the barrier screen inner from door weld as. the door fram e from door weld as. the stopper hinge top from door weld as. the spring and the hook. the supporter barrier screen outer from door fram e. the barrier screen outer from door fram e. the above steps for reassem bly.
4. M ethod to reduce the gap betw een 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 Tighten a screw.
push the door to contact the door seal to oven front surface.
2) To reduce gap located on part B.
Loosen two screws on stopper hinge under, and then Tighten two screws.
A sm all gap m ay be acceptable if the m icrow ave leakage does not exceed 4m W /cm 2.
5. To rem ove control panel parts.
C ON TRO L PA NEL ASSEM BLY : P KC P SW ZH00(KO R -631G) P KC P SW ZM 00(KO R-631H) P KC P SW N K00(KO R -861G) P KC P SW N J00(KO R -861H)

REF.NO

PART CODE

3518520900 3518520910

PART NAM E

S W ITC H M E M B R AN E

DES CRIPTION
K O R -631 G 0 S K O R -631H 0S

REM ARK

B 02 B 03 B 04 B 05 B 06 B 07
3516719000 P KM P M SZ A 3513702700 441G 430171 3516906900
C O NT R O L-PAN E L P C B M A IN AS S C R EW TA P PIN G LE V ER D O O R O P EN S P R IN G B UT TO N B U T TO N D O O R O PE N
A BS X R -401 H -2938 K O R -631 H 0S

T2S TR S 4X12 M FZN

A BS X R -401 H -2938
SW P DIA0.7 ABS XR-401 H -2938

3518521220 3518521230

K O R -861 G 0 S K O R -861H 0S
3516720200 P KM P M SN E 3513702700 441G 430171 3516906900
A BS X R -401 H -2938 K O R -860A 0S
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 connector of the PCB assem bly. 5) Detach m em brane from the control panel. 6) Rem ove door open button and button spring from the control panel. 7) Reverse the above steps for reassem bly.
6. To rem ove high voltage capacitor.
1) Rem ove a screw which secure the grounding ring term inal of the H.V.diode and the capacitor holder. 2) Rem ove the H.V. diode from the capacitor holder. 3) Reverse the above steps for reassem bly.
H igh voltage circuit w iring
7. To rem ove m agnetron.
1) Rem ove a screw which secure the m agnetron. 2) Rem ove the m agnetron. 3) Reverse the above steps for reassem bly.
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 with door norm ally closed.
8. To remove wind guide assembly. 1) Rem ove a screw which secure the wind guide assem bly. 2) Draw forward the wind guide assem bly. 3) Pull the fan from the m otor shaft. 4) Rem ove two screws which secure the m otor shaded pole. 5) Rem ove the m otor shaded pole. 6) Reverse the above steps for reassem bly.
9. To remove H.V.transformer. 1) Rem ove four screws holding the H.V.transform er. 2) Rem ove the H.V.transform er. 3) Reverse the above steps for reassem bly.
INTERLOCK MECHANISM AND ADJUSTMENT
The door lock m echanism is a device which has been specially designed to com pletely elim inate m icrowave radiation when the door is opened during operation, and thus to perfectly prevent the danger resulting from the leakage of microwave.
(1) Prim ary interlock switch W hen the door is closed, the hook locks the oven door. If the door is not closed properly, the oven will not operate. W hen the door is closed, the hook pushes the button of the m icroswitch. Then the button of the primary interlock switch bring it under ON condition. (2) Secondary interlock switch and interlock m onitor switch W hen the door is closed, the hook pushes the lock lever downward. The lock lever presses the button of the interlock m onitor switch to bring it under NO condition and presses the button of the secondary interlock switch to bring it under ON condition.

ADJUSTMENT

Interlock m onitor switch W hen the door is closed, the interlock m onitor switch should be changed(N O condition) before other sw itches are closed. W hen the door is opened, the interlock m onitor switch should be changed(N C condition) after other sw itches are opened.
(3) Adjustm ent steps a) Loosen the one m ounting screw. b) Adjust interlock switch assem bly position. c) M ake sure that lock lever m oves sm oothly after adjustm ent is com pleted. d) Tighten com pletely one m ounting screw.
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 earthing before trouble checking. 2) Be careful of the high voltage circuit. 3) Discharge the high voltage capacitor. 4) W hen checking the continuity of the switches, fuse or high voltage transform er, disconnect one lead wire from these parts and check continuity with the AC plug removed. To do otherwise m ay result in a false reading or dam age to your meter.
W hen electric parts are checked, be sure the pow er cord is not inserted the w all outlet. C heck w ire harness, w iring and connected of the term inals and power cord before check the parts listed below.
(TROUBLE 1) Oven does not operate at all : any inputs can not be accepted.
C O N D ITIO N Fuse blow s.
C heck co ntinuity of interlock m onitor sw itch w ith door closed (C O M N C)

RESULT

M alfunction of interlock m on itor sw itch

REM EDY

R eplace N O TE 1

C ontinuity

N o C ontinuity
C heck co ntinuity of both prim ary and secondary interlock sw itch w ith door colosed
N o C ontinuity C ontinuity
M alfunction of interlock sw itch
C heck co ntinuity of prim ary interlock sw itch contact w ith door partially open until interlock m onitor switch contact close (C O M <->N O )
S horted contacts of prim a ry interlock sw itch.
C heck co ntinuity of prim ary w inding of low voltage transform er
0 or infinite A pprox. 150~310 (norm al)
D efective low voltage transform er

R eplace

D isconne ct high voltage fuse and operate the unit

Fuse again blows

D efective high voltage transform er

CON DITION

O utlet has proper voltage Fuse does not blow.
C heck con tinuity of m agn etron C heck con tinuity of noise filter board C heck con tinuity of pow er supply cord
No C ontinuity No C ontinuity No C ontinuity N orm al

D isplay does not show program m ing at all, even if keyboard is touched.
C heck each pad for continuity of the m em brane keyboard for the follow ing keyboard check proce dure

N orm al

M alfunction of touch control circuit of control box sub-a ssem bly
R eplace control box sub-a ssem bly

A bnorm al

M alfunction of the m em brane keyboard
R eplace the m em brane keyborad
B efore following the particular steps listed above in the trouble shooting guide for the m em brane keyborads, failure, please check for the continuity of each wire-harness betw een the m em brane keyboard and P.C.B. assem bly.

MEASUREMENT AND TEST

1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT
M icrowave output power can be checked by indirectly m easuring the tem perature rise of a certain am ount of water exposed to the m icrowave as directed below. PROCEDURE 1. M icrowave power output m easurem ent is m ade with the m icrowave oven supplied at rated voltage and operated at its m axim um m icrowave power setting with a load of 1000 5cc of potable water. 2. The water is contained in a cylindrical borosilicate glass vessel having a m axim um m aterial thickness of 3 m m and an outside diam eter of approxim ately 190 m m. 3. The oven and the em pty vessel are at am bient tem perature prior to the start of the test. The initial tem perature of the water is C (50 3.6 F). It is m easured im m ediately before the water is added to the vessel. After addition of the water to the vessel, the load is im m ediately placed on the center of the shelf, which is in the lowest norm al position. 4. M icrowave power is switched on. 5. Heating tim e should be exactly A seconds. (Refer to table as following) Heating tim e is m easured while the m icrowave generator is operating at full power. The filam ent heat-up tim e for m agnetron is not included. 6. The initial and final tem perature of water is selected so that the m axim um difference between the am bient and final water tem perature is 5K. 7. The m icrowave power output P in watts is calculated from the following form ula: P = 4187 X
T is difference between initial and ending tem perature. t is the heating tim e.

The power m easured should be B (Refer to SPECIFICATIONS) W 10.0 %.
1. W ater load should be m easured exactly to 1 liters. 2. Input pow er voltage should be exactly specified voltage (R efer to S PE C IFIC ATIO N S ). 3. A m bient tem perature should be C (68 3.6 F)
Heating time for power output:
A (second) B (W ) 38 1100
2. MICROWAVE RADIATION TEST
1. M ake sure to check the m icrowave leakage before and after repair of adjustm ent. 2. Always start m easuring of an unknown field to assure safety for operating personnel from m icrowave 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 with the source of m icrowave energy. 5. Slowly approach the unit under test until the radiom eter reads an appreciable m icrowave leakage from the unit under the test.
PROCEDURE 1. Prepare M icrowave Energy Survey M eter, 600cc glass beaker, and glass therm om eter 100 C (212 F ). 2. Pour 275cc 15cc of tap water initially at C (F) in the 600 cc glass beaker with an inside diam eter of approx. 95 m m (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. M easure the leakage by using M icrowave Energy Survey M eter with dual ranges, set to 2450M Hz. 1) M easured radiation leakage m ust not exceed the value prescribed below. Leakage for a fully assem bled oven with door norm ally closed m ust be less than 4m W /cm 2. 2) W hen m easuring 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) M easuring 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 m ore slowly. 4) W hen m easuring near a corner of the door, keep the probe perpendicular to the areas m aking sure the probe end at the base of the cone does not get closer than 2 in. from any m etal. If it does not, erroneous reading m ay result.
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 attem pt m easurem ent 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) Rem ove connections from the transform er term inals and check continuity. 2) Norm al readings should be as follows : Secondary winding. Approx. 100
Prim ary winding. Approx. 1
Filam ent winding. Approx. 0
2. High voltage capacitor 1) Check continuity of capacitor with m eter on the highest OHM scale. 2) A norm al capacitor will show continuity for a short tim e, 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.
once the capacitor charged.
3. High voltage diode 1) Isolate the diode from the circuit by disconnecting the leads. 2) W ith the ohm m eter set on the highest resistance scale m easure the resistance across the diode term inals. Reverse the m eter leads and again observe the resistance reading. M eter with 6V, 9V or higher voltage batteries should be used to check the front-back resistance of the diode, otherwise an infinite resistance m ay be read in both directions. A norm al diode's resistance will be infinite in one direction and several hundred k

in the other direction.

4. Magnetron For com plete m agnetron diagnosis, refer to M easurem ent of the M icrowave Power Output. " Continuity checks can only indicate and open filam ent or a shorted m agnetron. To diagnose for an open filam ent or a shorted m agnetron, 1) Isolate m agnetron from the circuit by disconnecting the leads. 2) A continuity check across m agnetron filam ent term inals should indicate 0.1 or less. 3) A continuity check between each filam ent term inal and m agnetron case should read open. 5. Fuse If the fuse in the prim ary and m onitor switch circuit is blown when the door is opened, check the prim ary and m onitor switch before replacing the blown fuse. In case the fuse is blown by an im proper switch operation, replace the defective switch and fuse at the sam e tim e. Replace just the fuse if the switches operate norm ally.

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 V / Frequency: 60Hz
Term inal Voltage 4-7 LO AD A C 12.6 V N O LO A D A C 14.7 V
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 nom inal voltage.

2. Voltage Check - Key check point

CHECK POINT

IC1 P IN 2,21,30,34 IC1 P IN 35 -5VD C
T : 16.67m s(60H z) 3 IC1 P IN 31 O R 32

T : 250 ns(4M H z)

- Check m ethod

MEASURE POINT

MP1 MP2

WAVE FORM

D C -5V 0.25V D C -12V 2.0V

REMEDY

R eplace V L1, E C 1 Replace E C 2, D12,13,14

N O LO A D N O LO A D

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

Measure Point

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

POINT STATE

RELA Y 2 O N RELA Y 2 O F F

- 5V DC GND

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 1 does not operate. refer to Circuit Diagram ( Point 2 ) - Check m ethod

P OINT STATE

R ELA Y 1 O N RELA Y 1 O FF

-5VD C G ND

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 )

PO INT STATE

1) DO O R O P E N 2) D O O R C LO S E D

O P EN C LO SE

-5V DC GND

CHECK N O

METHOD
C heck the stage(O N,O F F) of the door open m onitor switch by resistance m easurem ent.
Replace door open m onitor sw itch.
5. W hen the digital clock does not operate properly.
refer to Circuit Diagram ( Point 5 )

POINT WAVE FORM

T: 16.67m s(60H z)
If clock does not keep exact tim e, you m ust check resistor R15,16, zener diodeZD1.
2. P.C.B. CIRCUIT DIAGRAM

3. P.C.B. LOCATION NO

33 B UZ Z E R C AR R AY C APAC ITO R ELE C C APAC ITO R ELE C C O N N E CT O R W A F E R C O N N E CT O R W A F E R C O N N E CT O R W A F E R D IO D E R EC T IF Y D IO D E R EC T IF Y D IO D E Z EN E R D IO D E Z EN E R LE D D IS PLAY P CB M A IN R AR R AY R ES IS TO R R ES IS TO R R ES IS TO R R ES IS TO R R ES IS TO R R ES IS TO R R ES IS TO R R EG U LATO R T RA N S IS TO R T RA N S IS TO R T RA N S P O W E R W IRE C O P P E R W IRE C O P P E R IC M IC O M R ES O N ATO R CE R A S W R E LAY S W R E LAY C APAC ITO R CE R A C APAC ITO R CE R A

SYM BOL

B Z1 CA 1 E C1 E C2 CN 1 CN 2 CN 3 D1~6,9~12 D13,14 Z D1 Z D2 DP 1 M 158 RA 1 R1~R 7 R8,10,12,14,22 R11,20,21 R13 R15~17 R18 R19 V L1 Q 1~5,9~11 Q6 LV T 1 J1-J21 S J4 IC1 CR 1 RY 1 RY 2 C6 C1~5,C 7

SP ECIFIC ATION

DESCRIPTION R efer to disassem bly and assem bly PC M T 0.6 G E T1 TR S 4X 10 M FZ N C AV IT Y W E LD A S C AV IT Y JO IN T A S T1 TR S 4X 10 M FZ N T2S T R S 4X12 M F ZN T2S T R S 4X12 M F ZN T1 TR S 4X 10 M FZ N 3X0.75 40X40 120-RT M L N Y LO N 66 T2S T R S 4X12 M F ZN T2S PA N 4X 30 M FZ N 220V 25W M W 10G A -M 01 PP PP + 30% G LA SS 2M 218H (M F)I T2 BO LT FLAN G E 5X12 D A C R O TT 3 T R S 4X8 M FZ N SE C C T 0.6 2100VAC 0.84uF #187 H V R -1X -3A B 12K V #187 D Y -N 80P0-63T TT 3 H EX 4X8 F LG M F Z N SB H G T0.8 T1 TR S 4X 10 M FZ N PP D AS F-130 TT 3 T R S 4X8 M FZ N SC P-1 T2.5 VP -533A -O F S PN O #187 200G VP -532A -O F S PN C #187 200G VP -533A -O F S PN O #187 200G PO M PO M BL 240V 25W T 25 C 7A H 187 T2S PA N 4X 6 M FZ N 220V 2.5W G M -16-24F D 12 220V 2.5W M 2LJ49Z T52 O F F:75 O N :65 H #187 N B PB T TT 3 T R S 4X8 M FZ N H E ATP R O O F PP XA R E C TE F LO N PP 5113M F6 A353B G LAS S

Q'TY 1

REF NO A00 B00 F 01 F 02 F 03 F 04 F 05 F 06 F 07 F 08 F 09 F 10 F11 F 12 F 13 F 14 F 15 F 16 F 17 F 18 F 19 F 20 F 21 F 22 F 23 F 24 F 25 F 26 F 27 F 28 F 29 F 30 F 31 F 32 F 33 F 34 F 35 F 36 F 37 F 38 F 39 F 40 F 41 F 42 F 7112401011 35113AC N M 5 4413A3515201101 4415A17352 4415A66600 4415A3511406200 4418D PART CODE PART NAME D O O R AS C O N T R O L PA N E L AS C A BIN E T S C R E W TA PP IN G C AVIT Y W E LD A S C AVIT Y JO IN T AS S C R E W TA PP IN G S C R E W TA PP IN G S C R E W TA PP IN G S C R E W TA PP IN G C O R D PO W E R AS C LA M P PO W E R C O R D S C R E W TA PP IN G S C R E W TA PP IN G M O T O R S H A D E D P O LE G U ID E W IN D FAN M A G N E TR O N S C R E W S PE C IAL S C R E W TA PTITE H O LD ER H V C APA C ITO R C A PA C ITO R H V D IO D E H V TRANS HV S PE C IA L S C R E W B AS E S C R E W TA PP IN G FOOT S C R E W TA PTITE S TO PP ER H IN G E *U S W M IC R O S W M IC R O S W M IC R O LEV ER LO C K LO C K LAM P S C R E W TA PP IN G M O T O R S YN C R O M O T O R S YN C R O T H E R M O S TAT H O LD ER T H E R M O S TAT S C R E W TA PTITE C O VE R W AV E G U ID E C O U P LE R R O LLE R G U ID E R O LLE R T R AY
DESCRIPTION R efer to D isassem bly and assem bly. PC M T 0.6 T1 TR S 4X 10 M FZ N C AV IT Y W E LD A S C AV IT Y JO IN T A S T1 TR S 4X 10 M FZ N T2S T R S 4X12 M F ZN T2S T R S 4X12 M F ZN T1 TR S 4X 10 M FZ N 3X0.75 40X40 120-RT M L N Y LO N 66 T2S T R S 4X12 M F ZN T2S PA N 4X 30 M FZ N 220V 25W M W 10G A -M 01 PP PP + 30% G LA SS 2M 218H (M F)I T2 BO LT FLAN G E 5X12 D A C R O TT 3 T R S 4X8 M FZ N SE C C T 0.6 2100VAC 0.84uF #187 H V R -1X -3A B 12K V #187 D Y -N 80P0-86T TT 3 H EX 4X8 F LG M F Z N SB H G T0.8 T1 TR S 4X 10 M FZ N PP D AS F-130 TT 3 T R S 4X8 M FZ N SC P-1 T2.5 VP -533A -O F S PN O #187 200G VP -532A -O F S PN C #187 200G VP -533A -O F S PN O #187 200G PO M PO M BL 240V 25W T 25 C 7A H 187 T2S PA N 4X 6 M FZ N 220V 2.5W G M -16-24F D 12 220V 2.5W M 2LJ49Z T52 O F F:75 O N :65 H #187 N B PB T TT 3 T R S 4X8 M FZ N H E ATP R O O F PP PP S TE F LO N PP G LAS S

DAEWOO ELECTRONICS CO., LTD
686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX : DWELEC K28177-8 CABLE : DAEWOOELEC E-mail : G7F00E@web.dwe.co.kr FAX : 02) 360-8184 TEL: 02) 360-8179~8180 PRINTED DATE : NOV. 1998

S/M No. : R63D79S002

Service Manual

Microwave Oven

Model: KOR-63D79S KOR-63D70S KOR-63F79S KOR-63F70S

Caution

: In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information,please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr).
DAEWOO ELECTRONICS CO., LTD.
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
(a) Do not operate or allow the oven to be operated with the door open. (b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs as necessary: (1) Interlock operation, (2) Proper door closing, (3) Seal and sealing surfaces (arcing, wear, and other damage), (4) Damage to or loosening of hinges and latches, (5) Evidence of dropping or abuse. (c) Before turning on 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.

TABLE OF CONTENTS

SAFETY AND PRECAUTIONS....2 1. FOR SAFE OPERATION.....2 2. FOR SAFE SERVICE PROCEDURES....2 SPECIFICATIONS......3 EXTERNAL VIEW.....4 1. OUTER DIMENSION.....4 2. FEATURE DIAGRAM.....4 INSTALLATION.....5 OPERATIONS AND FUNCTIONS.....6 DISASSEMBLY AND ASSEMBLY....7 INTERLOCK MECHANISM AND ADJUSTMENT....13 TROUBLE SHOOTING GUIDE.....14 MEASUREMENT AND TEST.....16 1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT..16 2. MICROWAVE RADIATION TEST....17 3. COMPONENT TEST PROCEDURE....18 WIRING DIAGRAM.....19 EXPLODED VIEW AND PARTS LIST....20 1. DOOR ASSEMBLY.....20 2. CONTROL PANEL ASSEMBLY.....20 3. TOTAL ASSEMBLY.....20

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 microwave emission check should be performed prior to servicing the oven. 2. If any certified oven unit is found to servicing, a microwave emission check should be performed prior to servicing the oven. (a) inform the manufacturer, importer or assembler, (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.

IMPORTANT

The wire in this mains lead coloured in accordance with the following code. Green-and-yellow : Each Blue : Neutral Brown : Live As the colours of the wires in the manins lead of this appliance may not correspond with the coloured markings identifying the terminals in your plug, proceed as follows. The wire which is coloured green-and-yellow must be connected to the terminal in the plug which is marked with the letter E, earth symbol or coloured green-and-yellow. The wire which is coloured blue must be connected to the terminal which is marked with the letter N or coloured black. The wire which is coloured brown must be connected to the terminal which is marked with the letter L or coloured red.

This oven is designed for counter-top use only.

SPECIFICATIONS

MODEL POWER SUPPLY POWER CONSUMPTION MICROWAVE GRILL COMBINATION 700W 2450MHz 465 x 279 x 364 mm (18.3 x 11.0 x 14.4 in) 290 x 220 x 306 mm (11.4 x 8.7 x 12.0 in) APPROX. 13kg (28.7 Ibs.) 35 MIN. DUAL SPEED MICROWAVE 7 LEVELS 0.7 Cu. Ft. 800W KOR-63D79S 1000W KOR-63D70S 1,200W 230V~50Hz, SINGLE PHASE WITH GROUNDING
MICROWAVE ENERGY OUTPUT MICROWAVE FREQUENCY OUTSIDE DIMENSIONS (W x H x D) CAVITY DIMENSIONS (W x H x D) NET WEIGHT TIMER FUNCTION SELECTIONS POWER SELECTIONS CAVITY VOLUME
* SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.
MODEL POWER SUPPLY POWER CONSUMPTION MICROWAVE GRILL COMBINATION

KOR-63F79S 1000W

KOR-63F70S 1,200W
230V~50Hz, SINGLE PHASE WITH GROUNDING

700W 2450MHz

465 x 279 x 364 mm (18.3 x 11.0 x 14.4 in) 290 x 220 x 306 mm (11.4 x 8.7 x 12.0 in) APPROX. 13kg (28.7 Ibs.) 35 MIN. DUAL SPEED MICROWAVE 7 LEVELS 0.7 Cu. Ft.

EXTERNAL VIEW

1. OUTER DIMENSION

2. FEATURE DIAGRAM

1. SAFETY INTERLOCK SYSTEM 2. DOORVIEWING SCREEN Allos viewing of food. The screen is designed so that light can pass through, but not the microwave. 3. DOOR HOOK When the door is closed, it will automatically lock shut. If door is opened while oven is operating, magnetron tube will immediately stop operating. 4. OVEN CAVITY 5. DOOR SEAL Door seal maintains the microwave within the oven cavity and prevents microwave leakage. 6. GLASS COOKING TRAY Made of special heat resistant glass. Food in a proper receptacle is placed on this tray for cooking.
7. ROLLER GUIDE This must always be used for cooking together with the glass cooking tray. 8. COUPLER This fits over the shaft in the center of the ovens cavity floor. This is to remain in the oven for all cooking. 9. KNOB V.P.C. Used in setting cooking time for all functions. 10. KNOB TIMER Used in setting cooking time for all functions. 11. DOOR RELEASE BUTTONBy pushing this button the latch system cut off all circuits and stops the oven before the door is opened.

INSTALLATION

1. Steady, flat location.
This microwave 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 be overheated and, eventually, cause oven 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.

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 6 amperes, 230 Volts, 50 Hz. 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 plug. The plug must be plugged into an outlet that is properly installed and earthed.

WARNING

Improper use of the earthing plug can result in a risk of electric shock. Consult a qualified electrician or serviceman if the earthing instructions are not completely 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-wire extension cord that has a 3-blade earthing plut, and a 3-slot receptacle that will accept the plug on the appliance. The marked 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 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. Choose cooking power level by setting V.P.C knob to the desired position. Refer to cookbook for recommended power levels. 5. Determine cooking time. Consult cookbook for recipe timing. Oven light turns on and cooling fan starts to operate. Microwave cooking starts. 6. You may open the door while the oven is operating. As soon as the door is opened, the safety mechanisms stop the generation of microwave power and the operation of cooking timer. If you wish to change the time during cooking, simply adjust the timer to the desired time. 7. When the timer reaches zero, a bell will ring and the unit will turn off. Oven light turns off. If additional cooking time is needed and the door is closed, the oven will automatically start when the timer is reset.
1. When setting timer for less than 2 minutes, tum the timer past 2 minutes and then return to the correct timer setting. 2. Various clicking noises may be heard when turning V.P.C knob. This is normal and does not affect the operation of your microwave oven.
Make sure the oven is properly installed and plugged into the electrical outlet.
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 to the desired position, the V.P.C switch has a cycle (ON/OFF time(sec.)) listed below.
Variable power setting Power level HIGH MED HIGH MEDIUM LOW STAGE DEFROST HEAT GENTLE HEATING * the above % can be changed within 6% Symbol
Approximate Percentage of Power 100% 88% 73% 59% 44% 26% 18%

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 safe 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 while earthed. It is imperative, therefore, to make 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 : Service personnel should remove their watches whenever working close to or replacing the magnetron.
WARNING : When 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 Transformer, Magnetron, HV Capacitor, HV Diode, HV fuse.
Caution: In this Service Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the
latest parts information, please refer to PPL(Parts Price List) in Service information Center(http://svc.dwe.co.kr)

1. To remove cabinet

1) Remove three screws on cabinet back. 2) Push the cabinet backward.
2. To remove door assembly
1) Remove two screws which secure the stopper hinge top. 2) Remove the door assembly from top plate of cavity. 3) Reverse the above for reassembly. NOTE : After replacing the door assembly, perform a check of correct alignment with the hinge and cavity front plate.

3. To remove door parts.

REF NO. A01 A02 A03 A04 A05 A06 A07 A08

PART CODE 351501300

PART NAME FRAME DOOR FRAME DOOR BARRIER-SCREEN *O STOPPER HINGE *T AS DOOR WELD ASSY BARRIER SCREEN *I GASKET DOOR HOOK SPRING HOOK
DESCRIPTION PP SI83C PP SI83C PET T0.125 KOR-63150S KOR-61150S PE T0.1 PP POM PW-1
QTY REMARK 1 KOR-63DKOR-63F1 1
(1) Remove the gasket door from door weld as. (2) Remove the door frame from door weld as. (3) Remove the stopper hinge top from door weld as. (4) Remove the spring and the hook. (5) Remove the barrier screen outer from door frame. (6) 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 screws on stopper hinge top, and then push the door to contact the door seal to oven front surface. Tighten two screws. (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 may be acceptable if the microwave leakage does not exceed 4mW/cm2.
5. To remove control panel parts.
REF NO. B01 B02 B03 B04 B05 B06 B07 B08 B09 B10 B11 B12
PART CODE 3513702710 441G3516906950
PART NAME KNOB VPC CONTROL-PANEL CONTROL-PANEL SPRING FLAT COUPLER VPC KNOB SCREW TAPPING COUPLER TIMER TIMER SCREW TAPPING KNOB LEVER DOOR OPEN SPRING BUTTON BUTTON DOOR OPEN BUTTON DOOR OPEN
DESCRIPTION ABS XR-401 H-2938 ABS SG-0760D SG-175 ABS SG-0760D SG-175 SUS 301 T0.5 POM T2S TRS 4*12 MFZN POM KN35MKD 15U-P T2S TRS 4*12 MFZN ABS XR-401 H-2938 PP SWP DIA. 0.7 ABS SG-0760D SG-175 ABS SG-0760D SG-175

QTY 1 1

REMARK (KOR-63D7) (KOR-63F7)

(KOR-63D7) (KOR-63F7)

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 timer assembly. 4) Remove the timer assembly. 5) Pull out the timer knob from the timer. 6) Pull out the timer coupler from the timer. 7) Remove the screw which secure the V.P.C coupler. 8) Pull out the V.P.C. coupler, V.P.C knob and flat spring from the control panel. 9) Remove door open button and button spring from the control panel. 10) Reverse the above steps for reassembly.
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.
x 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 reassembly.
NOTE : Never install the magnetron without the metallic gasket plate which is packed with each magnetron to prevent microwave leakage. Whenever repair work is carried out on magnetron, check the microwave leakage. It shall not exceed 4mW/cm2 for a fully assembled oven with door normally closed.
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 When the door is closed, the interlock monitor switch should be changed(NO condition) before other switches are closed. When the door is opened, the interlock monitor switch should be changed(NC condition) after other switches are opened.
(3) Adjustment steps 1) Loosen the mounting screw. 2) Adjust interlock switch assembly position. 3) Make sure that lock lever moves smoothly after adjustment is completed. 4) Tighten completely the mounting screw.
NOTE : Microwave emission test should be performed after adjusting interlock mechanism. If the microwave smission exceed 4mW/cm2, readjust interlock mechanism.

TROUBLE SHOOTING GUIDE

Following the procedure below to check if the oven is defective or not.
1. Check grounding before trouble checking. 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 check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter.
(TROUBLE 1) Door shut, timer set, but no cooking takes place.
Does the fan motor work when you shut the door and turn the timer? NO Does the fuse blow? NO YES

YES (Refer to next page)

Check continuity of interlock monitor switch with door shut. NO Continuity Replace fuse and check continuity of both interlock switchs contact and monitor switchs contact with door partially open until monitor switch contact. Both continuity Disconnect one side of the lead wire connected from transformer to the high voltage capacitor, and operate oven.

Continuity

Replace primary, secondary interlock switch and interlock monitor switch.

Normal

Replace high voltage capacitor.

Fuse again

Replace high voltage transformer
If outlet has proper voltage, check continuity of power supply cord.
NO Continuity Replace power supply cord.
Does the fan motor work when you shut the door and turn the timer? YES Does the oven lamp light? Does the turntable turn? YES Normal reading should be approx. 0 NO Replace or repair oven lamp, turntable motor.
If microwave do not oscillate, check continuity of filament of magnetron. Poor continuity

NO Continuity

Check continuity filament tap (3.3V) of high voltage. Continuity Check continuity filament tap (3.3V) of high voltage. Continuity

No Continuity

Replace high Voltage transformer
Continuity in the reverse direction.
Replace magnetron Meter with 6V or higher voltage batteries should be used to check the normal direction resistance of the diode
Check the isolation of filament winding of high voltage transformer.
Replace high voltage transformer.

Good Replace magnetron

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. PROCEDURE 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 10005cc 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 102C (503.6F) 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 vT/t vT is difference between initial and ending temperature. It is the heating time. The power measured should be B (Refer to SPECIFICATIONS)W10.0%.
CAUTION : 1. Water load should be measured exactly to 1 liters. 2. Input power voltage should be exactly specified voltage(Refer to SPECIFICATIONS). 3. Ambient temperature should be 202C(683.6F)
Heating time for power output: A(second) B(W) 38 1100
2. MICROWAVE RADIATION TEST
WARNING : Make sure to check the microwave leakage before and after repair of adjustment. Always start measuring of an unknown field to assure safety for operating personnel from microwave energy. Do not place your hands into any suspected microwave radiation field unless the safe density level is known. Care should be taken not to place the eyes in direct line with the source of microwave energy. Slowly approach the unit under test until the radiometer reads an appreciable microwave leakage from the unit under the test.
PROCEDURES 1. Prepare Microwave Energy Survey Meter, 600cc glass beaker, and glass thermometer 100C(212F). 2. Pour 275cc15cc of tap water initially at 205C(689F) in the 600cc glass beaker with an inside diameter of approx. 95mm(3.5in.). 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 5cm(2in.) 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.

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. 11010% 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 is 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 diodes 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 Power Output. 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

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
NO A00 B00 F01 F02 F03 F04 F05 F06 F07 F08 F09 F10 F11 F12 F13 F14 F15 F16 F17 F18 F19 F20 F21 F22
PART CODE 35113AEQ0D 4415D67620 4415D7S422X3518401000
PART NAME DOOR AS DOOR AS CONTROL-PANEL AS CONTROL-PANEL AS CABINET SCREW TAPPING CAVITY WELD AS CAVITY JOINT AS SCREW TAPPING SCREW TAPPING SCREW TAPPING SCREW TAPPING CORD POWER AS SCREW TAPPING SCREW TAPPING FUSE FUSE NOISE-FILTER SCREW TAPPING MOTOR SHADED POLE GUIDE WIND FAN MAGNETRON SPECIAL SCREW SCREW SPECIAL HOLDER HV CAPACITOR CAPACITOR HV DIODE HV AS DIODE HV AS

DESCRIPTION KOR-63D59A KOR-63F59A KOR-63D79S KOR-63F79S SECC T0.5 T1 TRS 4*10 MFZN CAVITY WELD AS KOR-63150S T1 TRS 4*10 MFZN T2S TRS 4*12 MFZN T2S TRS 4*12 MFZN T1 TRS 4*10 MFZN 3X0.75 70X70 100-RTML T1 TRS 4*10 MFZN T2S TRS 4*12 MFZN 250V 12A 65TS 250V 12A MDA DWLF-M12 T2S PAN 4X30 MFZN 230V 20W MW10CA-M02 PP PP+30%GLASS 2M218J(F) T2 BOLT FLANGE 5X12 DACRO TT2 TRS 4X8 SE MFZN SECC T0.6 2100VAC 0.98F #187 HVR-1X-30B #187 ESJC13-12BX #187

Q'TY 1

NO F23 F24 F25 F26 F27 F28 F29 F30 F31 F32 F33 F34 F35 F36 F37 F38 F39 F40 F41 F42 F43 F44 F45 F46 F47 F48 F49
PART CODE 3512100900 7S422X4415A17352 4415A66910 4415A7122401211 3518570400
PART NAME FUSE HV TRANS HV TRANS HV SPECIAL SCREW BASE SCREW TAPPING FOOT SCREW SPECIAL STOPPER HINGE *U SW MICRO SW MICRO SW MICRO LEVER LOCK LOCK LOCK LAMP HARNESS MAIN SCREW TAPPING MOTOR SYNCRO THERMOSTAT HOLDER THERMOSTAT SPECIAL SCREW COVER WAVE GUIDE COUPLER ROLLER GUIDE ROLLER TRAY SCREW TAPPING SWITCH S/A RELAY
DESCRIPTION 5KV 0.55A HV-41A55-02 TM-N70S0-63T(KOR-63D79S/63F79S) DY-N80S0-63T(KOR-63D70S/63F70S) TT3 HEX 4X8 FLG MFZN SBHG T0.7 T1 TRS 4*10 MFZN PP DASF-130 TT2 TRS 4X8 SE MFZN SCP-1 T2.5 VP-533A-OF SPNO #187 200G VP-531A-OF/SZM-V16-FA-61 VP-533A-OF SPNO #187 200G POM POM BLACK (KOR-63F7) POM NATURAL (KOR-63D7) BL 240V 25W T25 C7A H187 KOR-6315OS T2S PAN 4X6 MFZN 220V 2.5W GM-16-24FD12 OFF:75 ON:65 H #187 NB PBT TT3 HEX 4X8 FLG MFZN PP J640A XAREC TEFLON PP 5113MF6 A353B GLASS T2S TRS 4*12 MFZN DWSR-1
686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: DAEWOOELEC

S/M NO. : R63D79S002

PRINTED DATE: Jun. 2001