Service Manual
Contents
1. 1 DOOR SEAL Door seal maintains the microwave within the oven cavity and prevents microwave leakage 2 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 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 SAFETY INTERLOCK SYSTEM 7 CONTROL PANEL 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 0 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 1 ROLLER GUIDE Supports the glass cooking tray 3 CONTROL PANEL soup Gea 3 Jacket Potato G Fresh Vegetables 5 Frozen Vegetables Start Speedy Cook zx ON 2 Ss Reheat Meal 1 Display Cooking time power level present time are displayed 2 Auto Cook Used to cook using a2. CONDITION CHECK RESULT CAUSE REMEDY Display does 7 Check each pad for ONE Replace the not show continuity of the membrane Malfunction P C B main programming keyboard for the following key of the P C B assembly at all even if board check procedure main assembly membrane keyboard is touched gt Abnormal e Maltunetion gt Replace the of the membrane membrane keyboard keyboard EEE FETT NEE re di pia I NOTE Before following the particular steps listed above in the trouble shooting guide for the membrane keyboard s l failure please check for the continuity of each wire harness between the membrane keyboard and P C B l assembly d lE 20 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 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 approxi mately 190 mm 3 The oven and the empty vessel are at am
3. CONDITION CHECK RESULT CAUSE REMEDY Replace Outlet has e No Defective mag eas proper volt H Check continuity of magnetron Continuity ABHOR age Fuse does not blow Check continuity of No Defective mag ep ace noise filter board Continuity netron Check continuity of No Open power sup _Replace power supply cord Continuity ply cord Normal gt Defective touch 9 Replace control circuit REDE Seas aa ES CLE ie ee eed ae Ve Ae PE P aie aa a eet ans ee ho petra ter NOTE I All these switches must be replaced at the same time please refer to Interlock Mechanism And Adjustment TROUBLE 2 Display shows all figures selected but oven does not start cooking even though desired program and time are set and start button is pressed open relay coil CONDITION CHECK RESULT CAUSE REMEDY Turn table ma Check continuitv of primarv inter Malfunction of pri Adjust motor lock switch Continuity mary interlock replace oven lamp switch do not turn on Check continuity of secondary 0 Adjust or interlock switch Continuity Malfunction of sec replace ondary interlock switch Check D C voltage being sup EN gt Defective touch gt L HePlace pli
4. condition eg ee ee E E N MG OB IC a RONG Om ARETE ADJUSTMENT Interlock monitor switch When the door is closed the interlock monitor switch should be opened before other switches are closed I When the door is opened the interlock monitor switch should be closed after other switches are opened l LU AY V 3 Adjustment steps a Loosen the mounting screw b Adjust interlock switch assembly position c Make sure that lock lever moves smoothly after adjustment is completed d Tighten completely the mounting screw AL Microwave emission test should be performed after adjusting interlock mechanism If the microwave exceed 4mW cme readjust interlock mechanism ee Een ee 16 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 4 NOTE When electric parts are checked be sure the power cord is not inserted the wall outlet Check wire harness wiring connected of the terminals and power cord befo
5. NM EM EMEN E M MEM EM RE 22 3 COMPONENT TEST PROCEDURE iA eis e i CS B A o GR M AR AS AR M S UA RA B A S AUR A B UR e RU AB NAE A UR TR AUR a innnan 23 WIRING DIAGRAM mL 24 PRINTED CIRCUIT BOARD iii wa aaa an na WIE ann A a a ana e 25 1 CIRCUIT CHECK PROCEDURE tika map ae RN CS s s S a e JG eine nn 25 2 PCB CIRCUIT DIAGRAM DERE eto OEEPEPPREPEPHEEPEE PEPPER EP HEPEP EE EE 28 3 P C B LOCATION NO 29 EXPL ODED VIEW AND PARTS LIST Eee 30 1 DOOR ASSEMBLY mein sa ERR RU MR ER NEAR E SEO fir ECE EE MEE SEES EE EE MEE EN EE EE ERR ICT EE SEM CRTC TCR ERTIES 30 2 CONTROL PANEL ASSEMBLY 30 3 TOTAL ASSEMBLY etil baja anim aam alam 30 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
6. 36 38 39 40 29 28 27 26 R16 220 3 MT 220 2 MAT 220 1 220 5 bi R10 220 b w 10 q R9 220 7 f 220 wy 88 6 pre 4 Y N 05 61 KRATOGM IET 8 Qa 2 KRA106M SNP UN KA 08 KRATOOM Dd 02 KRA106M Ne q1 KRA106MSN_ D5 wiN4148 CAT opt a 7 6 1000PF pos REHEAT Me ge POULTRY FISH CLOCK START AUTO SP COOK gor DEFROST el COOK e PONER Pal 3 2 1 e 8 7 6 5 7P 6 1 8 100KJ 28 3 P C B LOCATION NO v Caution In this Service Manual some parts can be changed for improving their performance without notice 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 NO NAME SYMBOL SPECIFICATION PART CODE Q TY REMARK 1 BUZZER BZ1 BM 20K 3515600100 1 2 CARRAY 1 6 1000 50V CN6XB 102M 1 3 CAPACITOR CERA C5 102 50V Z
7. Key check point NO CHECK POINT REMARK 1 IC 1 PIN 2 21 30 34 5 VDC 2 IC 1 PIN 35 T 20ms 50Hz 3 IC 1 PIN 31 OR 32 T 250ns 4MHz Check method NO MEASURE POINT WAVE FORM REMEDY REMARK 1 MP1 DC 5V 0 25V Replace VL1 NO LOAD 2 MP2 DC 12V 2 0V Replace EC2 D12 D13 D14 NO LOAD T NOTE Each measure point must be measured with GND point 25 3 When there is no microwave oscillation 1 When touching START pad oven lamp does not turn on Fan motor does not rotate but cook indicator in display comes on Cause RELAY 2 does not operate refer to Circuit Diagram Point 3 Check method POINT STATE A B RELAY 2 ON 5 VDC GND RELAY 2 OFF GND 12 VDC 2 When touching START pad oven lamp turns on Fan motor and turntable rotate and cook indicator in display comes on Cause RELAY 1 does not operate refer to Circuit Diagram Point 2 Check method POINT STATE A B RELAY 1 ON 5VDC GND RELAY 1 OFF GND 12 VDC 4 When the door is opened during operation the count down timer does not stop refer to Circuit Diagram Point 1 Check method POINT STATE A B 1 DOOR OPEN OPEN 5VDC 2 DOOR CLOSED CLOSE GND CHECK NO METHOD REMEDY 1 Check the stage ON OFF of the door open monitor switch by Replace door open monit
8. 1 Remove four screws holding the H V transformer 2 Remove the H V transformer 3 Reverse the above steps for reassembly 15 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 th th 7 e VA 8j 84 e Y cos cos ul Primary interlock switch Interlock Button monitor Y switch Door open I monitor switch rear Lock lever Secondory interlock switch front Mounting screw Condition DOOR CLOSE Condition DOOR OPEN 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 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
9. S No R868G 75001 Service Manual Microwave Oven Model KOR 868G7S v 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 CORP http svc dwe co kr Jun 2003 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 micro wave 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 gen erating compartments check the magnetron wave guide or transmission line and cavity for proper align ment 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 mic
10. 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 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 the dealer immediately EEE EEE 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 mar
11. capacitor lt Q 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 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 pre I vent microwave leakage Whenever repair work is carried out on magnetron check the microwave leakage It shall I not exceed 4mW cm2 for a fully assembled oven with door normally closed Magnetron antenna Wave guide Magnetron antenna Metallic bad Cooling fin Filament terminal lt MAGNETRON gt Metallic gasket plate 14 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
12. program or to reheat 3 Auto defrost Used to defrost foods by weight 4 Power Used to set power level 5 Defrost Used to defrost foods by time 6 Clock Used to set clock 7 set pad Used to set the cooking time and the present time Reheat Meal Used to reheat meal or dinner plate 9 Stop Clear Used to stop the oven operation or to delete the cooking data Start Speedy Cook Used to start a selected operation and also increase the reheat time by 30 seconds 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 12 amperes 230 Volts 50 Hz Power supply cord is about 0 8 meters long The voltage used must be the
13. 1 SCREW TAPPING T1 TRS 4X10 MFZN 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 4415D67620 FUSE 250V 10A 3518606200 NOISE FILTER DWLF M12 7121402511 SCREW TAPPING T2S PAN 4X25 MFZN 3963512310 MOTOR SHADED POLE 230V 20W MW10CA M02 3512517000 GUIDE WIND PP 3511800300 FAN PP 30 GLASS 3518003700 MAGNETRON 2M218JFL 3516004000 SPECIAL SCREW T2 BOLT FLANGE 5X12 DACRO 7272400811 TAPTITE SCREW TT3 TRS 4X8 MFZN 3513003200 HOLDER HV CAPACITOR SECC T0 6 3518302200 CAPACITOR HV 2100VAC 0 98UF 187 3518400400 DIODE HV AS HVR 1X 3AB 12KV 187 3518701100 FUSE HV 5KV 0 55A 41 55 02 3518119340 TRANS HV DW R90S0 86T A 3516003700 SPECIAL SCREW TT3 HEX 4X8 FLG MFZN 3510311900 BASE SBHG T0 8 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 3512100900 FOOT PP DASF 130 7272400811 TAPTITE SCREW TT3 TRS 4X8 MFZN 3515201101 STOPPER HINGE U SCP 1 2 5 4415A17352 SW MICRO VP 533A OF SPNO 187 200 4415A66910 SW MICRO VP 531A OF SZM V 16 FA 61 4415A17352 SW MICRO VP 533A OF SPNO 187 200 3513702600 LEVER LOCK POM 3513811700 LOCK POM BLACK 3518571000 SWITCH PUSH MP101C 3513601600 LAMP BL 240V 25W T25 C7A H187 7121400611 SCREW TAPPING T2S PAN 4X6 MFZN 39660
14. 30900 MOTOR SYNCRO 220 240V 50 60HZ TYJ50 8A7 3518905300 THERMOSTAT OFF 75 ON 65 H 187 NB 3513003400 HOLDER THERMOSTAT PP NATURAL 7272400811 TAPTITE SCREW TT3 TRS 4X8 MFZN 3511406200 COVER WAVE GUIDE PP J640A WHITE 3517400620 COUPLER XAREC 3514700900 ROLLER TEFLON 3512509210 GUIDE ROLLER PP 5113MF6 A353B 3517203500 TRAY GLASS 31 o0 1 1 I1 I1 a a a a a a a a a pol ao aH A a a a l 12 1 a 2 Gyll s S M No R868G7S001 DAEWOO DAEWOO ELECTRONICS CORP 686 AHVEON DONG MAPO GU SEOUL KOREA BOX 8003 SEOUL KOREA TELEX DWELEC K28177 8 CABLE DAEWOOELEC PRINTED DATE Jun 2003
15. 66Y 1 34 TRANS POWER LVTI DMR 631FS 5EPV035303 1 35 WIRE COPPER J1 2 4 11 12 16 18 21 1 0 52 COATING 85801052GY 9 7 5 36 WIRE COPPER J3 7 8 10 13 15 19 20 1 0 53 COATING 85801053GY 9 10 37 WIRE COPPER J5 6 9 1 0 54 TIN COATING 85801054GY 3 12 5MM 38 WIRE COPPER SJ1 1 0 52 TIN COATING 85801052GY 1 7 5MM 29 EXPLODED VIEW AND PARTS LIST Refer to Disassembly and assembly 1 DOOR ASSEMBLY 2 CONTROL PANEL ASSEMBLY Refer to Disassembly and assembly 3 TOTAL ASSEMBLY 30 v 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 PART CODE PART NAME DESCRIPTION REMARK 3511712790 DOOR AS KOR 868G7S PKCPSWAQ20 CONTROL PANEL AS KOR 868G7S 3510805400 CABINET 861505 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 3516109900 CAVITY AS 861505 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 35113AEQOD CORD POWER AS 3X0 75 70X70 100 RTML 4413A90012 CLAMP POWER CORD NYLON66 711240101
16. AXIAL CCZB1H102K 1 4 CAPACITOR CERA C1 4 6 104 50V Z AXIAL CCZF1H104Z 5 5 CAPACITOR ELEC EC1 50V RS 1MF CEXE1H109A 1 6 CAPACITOR ELEC EC2 25V RSS 1000MF CEXF1E102V 1 7 CONNECTOR WAFER CN1 YW396 02V 3519150520 1 8 CONNECTOR FILM CN2 FCZ 254 11 441M367160 1 9 CONNECTOR WAFER CN3 YW396 05AV 3519150510 1 10 DIODE RECTIFY D1 7 9 12 1N4148 DZN4148 11 11 DIODE RECTIFY D13 14 KN4004A DZN4004A 2 12 DIODE ZENER ZD1 UZ 5 1BSB 1 2W DZUZSRIBSB 1 13 DIODE ZENER ZD2 UZ 3 9BSB 1 2W DZUZ3R9BSB 1 14 IC MICOM TMP47C440BN 3J52 13GS632GH0 1 15 IC REGULATOR VL1 MC7905C 1MC7905C 1 16 LED DISPLAY DP1 DDG 631H01 DDDG631H01 1 17 PCB MAIN M304 92X161 3514321190 1 18 RARRAY RA1 7P 6 1 8 100K J RA 87X104J 1 19 REGISTER R8 10 16 19 1 6W 220 5 RD AZ221J 7 20 REGISTER R1 2 6 12 21 1 6W 1K 5 RD AZ102J 5 21 REGISTER R3 22 23 1 6W 100K 5 RD AZ104J 3 22 REGISTER R11 1 6W 200 5 RD AZ201 J 1 23 REGISTER R13 14 1 6W 10K 5 RD AZ103J 3 24 REGISTER R15 1 6 510 5 RD AZ51 1J 1 25 REGISTER R7 1 6W IM 5 RD AZ105J 1 26 REGISTER R4 1 6W 4 7K 5 RD AZ472J 1 27 REGISTER R20 1 AW 51 5 RD 4Z510J 1 28 RESONATOR CERA JIGRI CRT 4 00MS 5P4ROOMTS 1 29 SW RELAY RY1 G5G 1A DC12V 5SC0101121 1 30 SW RELAY RY2 511 125 1C 1P 5560101128 1 31 SW TACT SW1 3 JTS1230U SEALED 5850101201 3 32 TRANSISTOR Q1 5 8 10 KRA 106M TZRA106M 8 33 TRANSISTOR Q6 KTA 1266Y TZTA12
17. STOP CLEAR pad once more If the oven door is opened during the oven operation all information is retained 8 if the START pad is touched and the oven does not operate check the area between the door and door seal for obstruc tions and make sure the door is closed securely The oven will not start cooking until the door is completely closed or the program has been reset ee ao aa ae NEE NT A ON MEER ok ell AR Make sure the oven is properly installed and plugged into the electrical outlet Wattage 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 Power level Display Approximate Percentage of Power once 100 90 90 3 times P 80 80 4 times P 70 70 5 times P 60 60 6 times P 50 50 7 times P 40 40 8 times P 30 30 9 times P 20 20 10 times P 10 10 11 times 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 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 U
18. WAVE RADIATION TEST a Ec ss s a a CAUTION 1 Make sure to check the microwave leakage before and after repair of adjustment 2 Always start measuring of an unknown field to assure safety for operating personnel from microwave energy 3 Do not place your hands into any suspected microwave 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 microwave energy 5 Slowly approach the unit under test until the radiometer reads an appreciable microwave leakage from the unit under the test as PROCEDURES Prepare Microwave Energy Survey Meter 600cc glass beaker and glass thermometer 100 C 212 F Pour 275 15 of tap water initially at 20 5 C 68 9 F in the 600cc glass beaker with an inside diameter of approx 95mm 3 5in Place it at the center of the tray and set it in a cavity Close the door and operate the oven 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 cm 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
19. bient 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 AT is difference between initial and ending temperature tis the heating time The power measured should be B Refer to SPECIFICATIONS W 10 0 A ie a oe x IMG Le ke ein em a oe EE EET I CAUTION 1 Water load should be measured exactly to 1 liter 2 Input power voltage should be exactly specified voltage Refer to SPECIFICATIONS 3 Ambient temperature should be 20 2 C 68 3 6 F l l r 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 21 2 MICRO
20. ed to RELAY RY2 coil control circuit Approx gt Faulty contacts of pepate 15 VDC RELAY RY2 or 18 TROUBLE 3 No microwave oscillation even though fan motor rotates CONDITION CHECK RESULT CAUSE REMEDY No Continuity lass Check continuity of high oscillation voltage fuse Replace high voltage fuse M gt Check continuity of high gt Continuity gt Defective high Replace voltage capacitor terminals voltage trans with wires removed former Check continuity of high voltage gt Continuity in gt Defective high Replace rectifier in forward and backward backward voltage rectifier direction with DC megger direction Connect megger leads to mag gt Continuity gt Defective mag Replace L netron terminal and magnetron netron body Check resistance of primary and 0009 gt Defective high Replace secondary coil of high voltage voltage trans transformer former No m Check continuity of magnetron Continuity Defective mag menace with wires removed netron m No ua hi Check continuitv of filament termi Continuit oe nan voltage trans nal of high voltage transformer for
21. hese parts as follows HV Transformer Magnetron I HV Capacitor HV Diode HV fuse l Lu i i i i i SL 1 To remove cabinet 1 Remove three screws on cabinet back 2 Push the cabinet backward 2 To remove door assembly 1 Remove one screw which secure the stopper hinge top 2 Remove the door assembly from top plate of cavity 3 Reverse the above for reassembly EIE II EE Eccc NOTE After replacing the door assembly perform a check of correct alignment with the hinge and cavity front plate 10 v 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 remove door parts PART CODE PART NAME DESCRIPTION REMARK 3512207900 FRAME DOOR ABS SG 175 SG 0760D 2TE16A27CL DOUBLE TAPE 0 16T X 27MM CLEAR 550M 3517008200 BARRIER SCREEN O SAN T1 5 3515204100 STOPPER HINGE T 5 631505 3511711800 DOOR PAINTING AS KOR 866T0S 3517006000 BARRIER SCREEN I PE 0 1T 3512302000 GASKET DOOR PP 3513100700 HOOK POM 3515101300 SPRING HOOK PW1 11 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 to
22. ill show constant 10 0 b 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 oth erwise an infinite resistance may be read in both directions A normal diode s resistance will be infinite in one direction and several hundred KQ 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 10 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 nor
23. kings 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 LR This oven is designed for counter top use only S SPECIFICATIONS MODEL KOR 868G7S POWER SUPPLY 230V 50Hz SINGLE PHASE WITH EARTHING MICROWAVE 1350W POWER GRILL CONSUMPTION COMBINATION MICROWAVE ENERGY OUTPUT 900W MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS W X H X D 495 x 294 x 384 mm 19 5 x 11 6 x 15 1 in CAVITY DIMENSIONS W X H X D 320 x 237 x 343 mm 12 6 x 9 3 x 13 5 in NET WEIGHT APPROX 13 5 kg 29 7 Ibs TIMER 59 min 99 sec FUNCTION SELECTIONS MICROWAVE POWER SELECTIONS 10 LEVELS CAVITY VOLUME 0 9 Cu Ft SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE EXTERNAL VIEW 1 OUTER DIMENSION 495 384 294 2 FEATURE DIAGRAM
24. mally 23 WIRING DIAGRAM PRIMARY INTERLOCK HIGH VOLTAGE SWITCH UPPER TRANSFORMER RD RD ji meo L HEA MONTOR _ CUT OUT POWER SUPPLY 0 SINGLE PHASE ONLY i u FILTER ASSY CONTROL PCB ASSY W W ree x I NR Tau DE I M A u 7 N Ns dU a CD GID GE GN FLAY 2 00 BL MACNETRON Cr HV DoE W Mi SECONDARY INTERLOCK SWITCH NOTE RD RED OR ORANGE CL CAVITY LAMP CONDITION MH WHITE 3 BLUE FAL FAN BLONER MOTOR DOOR CLOSED BK BLACK GW GRAY CM GEARED MOTOR COOK OFF CN SCREEN GE GREEN AELLOM BR BROAN 24 PRINTED CIRCUIT BOARD 1 CIRCUIT CHECK PROCEDURE 1 Low Voltage Transformer check low voltage transformer is located on the P C B Measuring condition input voltage 230V Frequency 50Hz Terminal Voltage LOAD NO LOAD 4 7 DC 12V AC 30 5 V I NOTE 1 Refer to Circuit Diagram point 4 I 2 Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source voltage 3 The allowable tolerance of the secondary voltage is within 5 of nominal voltage 2 Voltage check
25. mer gt OV Check D C voltage being sup Defective touch popao plied to RELAY RY1 coil control circuit gt Approx gt Faulty Replace 15 VDC contacts or RELAY RY1 or open relay coil 19 TROUBLE 4 The following visual conditions indicate a probable defective touch control circuit or membrane switch assembly Incomplete segments 1 Segments missing 2 Partical segments missing 2 3 Digit flickering other than normal displav slight flickering 4 0 does not display when power is on B E 7 B distinct change in the display are not on when they numbers is the gt display 9 C oo En 222 3 One or more digits in the display 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 button is touched 6 Display does not count down or up with time cooking or clock operation 7 Oven is programable 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 cancel button 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
26. or resistance measurement switch 5 When the digital clock does not operate properly refer to Circuit Diagram Point 5 f clock does not keep exact time you must check resistor R26 R27 C5 POINT WAVE FORM A T 20ms 50Hz 27 2 PCB CIRCUIT DIAGRAM Q10 TMP47C440OBN 3J52 BM 20K Point CN1 1 Yw396 02V 2 U O ANN R1 D O M SW 1K esc A 1206 E 09 MAGNETRON puc CS11 12SH 1C TRAY FAN LAMP RA106M RA106M Ty VLI p13 7905 1119 ES KN4004A PE pir D14 25 i 4 L4 KN4004A H YW396 05AV NM did H DMR 631FS H Point R12 Q6 KTA1266Y V1 geo f SELECTION JUMPER T T 1 R7 L Ti SJ1 SJ2 4 SJ5 56 Le TORI VI CRT 4 00MS INSEFT REMOVE REMOVE remove REMOVE REMOVE yi R6 R5 1K 41 R92 R40 13 R62 55 RESET 31 XIN 32 4 AINT P10 Pil P12 P13 P20 21 P22 R81 R82 R83 R90 R91 K02 K01 K00 P70 P71 R42 R43 R50 R51 R52 RSS 17 18 19 20 22 23 24
27. p and then push A the door to contact the door seal to oven front surface Tighten two screws 2 To reduce gap located on part B if Loosen two screws on stopper hinge under and then push the door to contact the door seal to oven front surface Tighten two screws ji el De eee EA A a rc C MU aa ee Peter NOTE A small gap may be acceptable if the microwave leakage does not exceed 4mW cm 12 v 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 5 To remove control panel parts 277 000 00 0000 00 000 00 PART CODE PART NAME DESCRIPTION REMARK 3516911300 BUTTON DOOR OPEN ABS SG 175 SG 0760D 3518522240 MEMBRANE KOR 868G7S 4416430171 SPRING BUTTON SWP DIA 0 7 3516729700 CONTROL PANEL ABS SG 175 SG 0760D 3516911100 BUTTON FUNCTION A ABS SG 175 SG 0760D PKMPMSAQ20 MAIN PCB AS KOR 868G7S 7122401211 SCREW TAPPING 25 TRS 4X12 MFZN 3516911200 BUTTON FUNCTION B ABS SG 175 SG 0760D 3513703100 LEVER DOOR OPEN PP 13 6 To remove high voltage
28. pliance 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 LU sA OPERATIONS AND FUNCTIONS This section includes useful information about oven operation 1 Plug power supply cord into a 230V 50Hz power 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 Shut the door Make sure that it is firmly closed When the oven door is opened the turns off 2 The oven door can be opened at any time during operation by touching the door release button on the control panel The oven will automatically shut off To restart the oven close the door and then touch START 3 Each time a pad is touched BEEP will sound to acknowledge the touch A The oven automatically cook on full power unless set to a lower power level B The display will show 0 when the oven is plugged in 6 Time clock returns to the present time when the cooking time ends 7 When the STOP CLEAR pad is touched during the oven operation the oven stops cooking and all information retained To erase all information except the present time touch the
29. re check the parts listed below TROUBLE 1 Oven does not operate at all inputs can not be accepted CONDITION CHECK RESULT CAUSE REMEDY Fuse blows gt Replace Check continuity of interlock Continuity 3 2 monitor switch with door closed tor switch No Continuity Check continuity of both primary No Continuity and secondary interlock switch Malfunction of with door colosed m Continuity interlock switch Check continuity of primary inter gt _ Continuity Shorted con Heplaee lock switch contact with door tacts of primary partially open until interlock mon interlock switch itor switch contact close COM NO Check continuity of primary i pags IKA gt Defective low sera winding of low voltage trans Approx voltage trans former 11600 former normal gt Fuse again gt Defective low Disconnect high voltage fuse blows voltage trans and operate the unit former 17
30. rowave leakage check to verify compliance with the Federal performance standard should be per formed on each oven prior to release to the owner TABLE OF CONTENTS SAFETY AND PRECAUTIONS u 2 1 FOR SAFE OPERATION RR RT NR TR t rat E TEL G arab nanpa RON RR RR a E LR RR PLE E E un 2 2 FOR SAFE SERVICE PROCEDURES M 2 SPBECIFICATIONS clc cutn RE EEE 3 EXTERNAL VIEW E 4 1 OUTER DIMENSION asassaanassansanasasannsanaasaswansansansansaasansaasansannsnsannsnsannsnsannansannaasannaasannnansnanansaaasansasasansaasansassansansassansa 4 2 FEATURE DIAGRAM EN EEE NENNE fa a 5 8 CONTROL PANEL aannasasnaasannaasasanassnanaasnanaasnnasassnasasnanasaasnaanaanaanassaannasassnanansanaansasaansasaansassansasnanaasnanaasnansannasasannansannana 6 INSTALLATION E EE EE 7 OPERATIONS AND FUNCTIONS ERR 8 DISASSEMBLY AND ASSEMBLY Gsasasasasasasasayasqqhascyawayaycyayayquascyasasayquasayayaysyascyaycaa saq 9 INTERLOCK MECHANISM AND ADJUSTMENT nnne rnnt 16 TROUBLE SHOOTING GUIDE HH 17 MEASUREMENT AND TEST sidi iii a 21 1 MEASUREMENT THE MICROWAVE POWER OUTPUT l 21 2 MICROWAVE RADIATION TEST SERRE EPA E RR RERUM
31. 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 earth ing plug The plug must be plugged into an outlet that is properly installed and earthed picta uA T E EDD Ic eI I IE seus WARNING Improper use of the earthing plug can result in a risk of electric shock Consult a qualified electrician or service man if the earthing instructions are not completely understood or if doubt exists as to whether the ap
32. se 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 15A fuse is blown out due to the operation of the monitor switch replace primary interlock switch secondary interlock switch and interlock monitor switch 5 After repair or replacement of parts make sure that the screws are properly tightened and all electrical connections are tightened 6 Do not operate without cabinet l Mini Pi Ga ah A ea EEE er CAUTION Service personnel should remove their watches whenever working close to or replacing the magnetron I REDI ae ain EE LE C e WARNING When servicing the appliance need a care of touching or replacing high potential parts because of I electrical shock or exposing microwave T
33. 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 22 3 COMPONENT TEST PROCEDURE High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle e 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 1409 10 Filament winding Approx 00 Primary winding Approx 20 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 10MQ once the capacitor is charged 3 A shorted capacitor will show continuous continuity 4 An open capacitor w
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