Service Manual Microwave Oven Model: KOR-631G0A KOR-631H0A KOR-861G0A KOR-861H0A 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 w ith the door open.
SAFETY AND PRECAUTIONS CAUTION This D evice is to be S erviced O nly by P roperly Q ualified S ervice P ersonnel. C onsult the S ervice M anual for Proper S ervice P rocedures to A ssure C ontinued S afety Operation and for Precautions to be Taken to Avoid Possible Exposure to E xcessive M icrow ave E nergy. 1. FOR SAFE OPERATION Dam age that allows the m icrowave energy ((that cooks or heats the food) to escape will result in poor cooking and m ay cause serious bodily injury to the operator.
SPECIFICATIONS M O D EL K O R -63BG /H PO W E R SU P PLY 120V -60H z, SIN G LE PH AS E W ITH G R O U N D IN G M IC R O W AVE PO W E R C O N SU M PTIO N KO R -86BG /H 1200W 1350W 800W 900W 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 2450M H z O U T S ID E D IM EN SIO N S (W X H X D ) 465 x 279 x 354m m (18.3 x 11.0 x 13.9 in.) 495 x 294 x 384m m (19.5 x 11.6 x 15.1 in.) C AV IT Y D IM E N S IO N S (W X H X D ) 290 x 211x 306 m m (11.4 x 8.
EXTERNAL VIEW 1.
EXTERNAL 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.
EXTERNAL VIEW 3. CONTROL PANEL 1) KOR-63BG0A / 86BG0A 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.
EXTERNAL VIEW 3) KOR-63BH0A / 86BH0A 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.
INSTALLATION 1. Steady, flat location This m icrowave oven should be set on a steady, flat surface. 2. Leave space behind and side All air vents should be kept a clearance. If all vents are covered during operation, the oven may overheat and, eventually, cause oven failure. 3. Away from radio and TV sets Poor television reception and radio interference m ay result if the oven is located close to a TV, radio, antenna or feeder and so on. 4.
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.
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.
DISASSEMBLY AND ASSEMBLY 1. To remove cabinet 1) Rem ove three screws on cabinet back. 2) Push the cabinet backward. 2. To remove 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. NOTE A fter replacing the door assem bly, perform a check of correct alignm ent with the hinge and cavity front plate.
DISASSEMBLY AND ASSEMBLY 3. To remove door parts. 1) KOR-63BG0A/63BH0A REF. NO PA RT CODE PART N AME DESCRIPTION Q TY A 01 3512202070 FR A M E D O O R A BS X R -401 1 A 02 3517003050 BA R R IER -S C RE E N *O A CRY L 1 A 03 3515304610 SU P P O RTE R B AR R -S *O PP 1 A 04 3515204100 ST OP P E R H IN G E *T A S K O R -63150S 1 A 05 3511705500 DO O R W E LD A S K O R -61150S 1 A 06 3517002800 BA R R IER -S C RE E N *I P O LY E S T ER T 0.
DISASSEMBLY AND ASSEMBLY 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 plate. the barrier screen inner from door plate. the door fram e from door plate. the stopper hinge top from door plate. 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. Method to reduce the gap between the door seal and the oven front surface.
DISASSEMBLY AND ASSEMBLY 5. To remove control panel parts. 1) KOR-63BG0A/63BH0A REF.
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 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.
DISASSEMBLY AND ASSEMBLY 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.
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) 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.
TROUBLE SHOOTING GUIDE CON DITION CHECK RESULT CAUSE REM EDY O utlet has proper voltage Fuse does not blow.
TROUBLE SHOOTING GUIDE ( TROUBLE 3 ) No m icrowave oscillation even though fan m otor rotates.
TROUBLE SHOOTING GUIDE ( TRO UBLE 4 ) The follow ing visual conditions indicate a probable defective touch control circuit or m em brane sw itch assem bly. 1. Incom plete segm ents, 1) Segm ents m issing. 2) Partical segm ents m issing. 3) Digit flickering other than norm al display slight flickering. 4) “ : 0 ” does not display when power is on. 2. A distinct change in the diplay are not on when they num bers is the display. M/W DEF. Lock g 3.
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.
MEASUREMENT AND TEST 2. MICROWAVE RADIATION TEST CAUTION 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.
MEASUREMENT AND TEST 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.
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: 120 V / Frequency: 60Hz 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 transformer changes in proportion to fluctuation of power source voltage. 3.
PRINTED CIRCUIT BOARD M P1 M P2 Measure Point
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. - Check m ethod refer to Circuit Diagram ( Point 3) POINT A B RELA Y 2 O N - 5V DC GND RELA Y 2 O F F GND - 12V DC STATE 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.
PRINTED CIRCUIT BOARD 2. P.C.B.
PRINTED CIRCUIT BOARD 3. P.C.B.
PRINTED CIRCUIT BOARD 2) KOR-86BG0A/86BH0A 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
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.
EXPLODED VIEW AND PARTS LIST 1) KOR-63BG0A/63BA0A REF NO PART CO DE PART NAM E DESCR IPTIO N A 00 3511710330 DOOR AS K O R -63B50S 1 B 00 3516721430 C O NT R O L-PAN E L AS K O R -63BG 0A 1 3516721440 C O NT R O L-PAN E L AS K O R -63BH 0A 1 F 01 3510801310 C A BIN E T P CM T 0.
EXPLODED VIEW AND PARTS LIST REF NO PART CO DE PART NAM E DESCR IPTIO N F 35 3513811700 LO CK POM 1 F 36 3513601500 LA M P B L 125V 25W T 25 C 5A H 187 1 F 37 7121400611 S C RE W TA P PIN G T 2S PA N 4X6 M F ZN 1 F 38 3966820200 M O TO R S Y NC R O 120V 2W G M -16-12F 17 1 F 39 3518905300 T H ER M O STAT O FF :75 O N :65 H #187 NB 1 F 40 3513003400 H O LD E R TH E R M O S TAT P BT 1 F 41 3516003700 S P E CIA L SC R E W T T3 H E X 4X 8 F LG M F ZN 1 F 42 3511406200 C
EXPLODED VIEW AND PARTS LIST 2) KOR-86BG0A/86BH0A REF NO PART CO DE PART NAM E DESCR IPTIO N A 00 3511710710 DOOR AS K O R -86B50S 1 B 00 3516721130 C O NT R O L-PAN E L AS K O R -86BG 0A 1 3516721140 C O NT R O L-PAN E L AS K O R -86BH 0A 1 F 01 3510801400 C A BIN E T P CM T 0.
EXPLODED VIEW AND PARTS LIST REF NO PART CO DE PART NAM E DESCR IPTIO N F 35 3513811700 LO CK POM 1 F 36 3513601500 LA M P B L 125V 25W T 25 C 5A H 187 1 F 37 7121400611 S C RE W TA P PIN G T 2S PA N 4X6 M F ZN 1 F 38 3966820200 M O TO R S Y NC R O 120V 2W G M -16-12F 17 1 F 39 3518905300 T H ER M O STAT O FF :75 O N :65 H #187 NB 1 F 40 3513003400 H O LD E R TH E R M O S TAT P BT 1 F 41 3516003700 S P E CIA L SC R E W T T3 H E X 4X 8 F LG M F ZN 1 F 42 3511406200 C
