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Shop Quality Grill Parts & Appliance Parts – Over 25,000 ModelsMagic Chef Microwave Parts - Select From 180 Models
Installation Guide for DAEWOO ELECTRONICS models including: MCD1611ST, KOR-164HBA02, MCD1611ST Microwave Oven, MCD1611ST, Microwave Oven, Oven
Magic Chef MCD1611ST Parts | Microwaves
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 ...
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DocumentDocumentThis Owner's Manual is provided and hosted by Appliance Factory Parts. MAGIC CHEF MCD1611ST Owner's Manual Shop genuine replacement parts for MAGIC CHEF MCD1611ST Find Your MAGIC CHEF Microwave Parts - Select From 180 Models -------- Manual continues below -------- S/M No.: Service Manual Microwave Oven Model : KOR-164HBA02 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 microwave source, and make repairs as necessary: (1) Interlock operation, (2) Proper door closing, (3) Seal and sealing surfaces (arcing, wear, and other damage), (4) Dam age to or loosening of hinges and latches, (5) E vidence of dropping or abuse. (c) Before turning on power to the m icrowave oven for any service test or inspection within the microwave generating compartments, check the magnetron, 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 systems shall be repaired, replaced, or adjusted by procedures described in this manual before the oven is released to the owner. (e) A m icrowave leakage check to verify com pliance 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 .................................................................................................................... 5 3. CONTROL PANEL ........................................................................................................................ 6 INSTALLATION ................................................................................................................................... 7 OPERATIONS AND FUNCTIONS....................................................................................................... 8 DISASSEMBLY AND ASSEMBLY...................................................................................................... 9 INTERLOCK MECHANISM AND ADJUSTMENT............................................................................... 16 TROUBLE SHOOTING GUIDE ........................................................................................................... 17 MEASUREMENT AND TEST .............................................................................................................. 21 1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ...................................................... 21 2. MICROWAVE RADIATION TEST ................................................................................................. 22 3. COMPONENT TEST PROCEDURE ............................................................................................. 23 WIRING DIAGRAM.............................................................................................................................. 24 PRINTED CIRCUIT BOARD................................................................................................................ 25 1. CIRCUIT CHECK PROCEDURE .................................................................................................. 25 2. PCB CIRCUIT DIAGRAM.............................................................................................................. 28 3. P.C.B. LOCATION NO. ................................................................................................................. 29 EXPLODED VIEW AND PARTS LIST................................................................................................. 30 1. DOOR ASSEMBLY ....................................................................................................................... 30 2. CONTROL PANEL ASSEMBLY.................................................................................................... 30 3. TOTAL ASSEMBLY....................................................................................................................... 30 1 SAFETY AND PRECAUTIONS CAUTION This D evice is to be Serviced O nly by Properly Qualified Service Personnel. C onsult the Service M anual for P roper S ervice Procedures to A ssure Continued S afety O peration and for P recautions to be Taken to Avoid P ossible Exposure to Excessive M icrowave Energy. 1. FOR SAFE OPERATION Damage that allows the microwave energy ((that cooks or heats the food) to escape will result in poor cooking and may cause serious bodily injury to the operator. IF ANY OF THE FOLLOW ING CONDITIONS EXIST, OPERATOR M UST 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 m anufacturer, im porter or assem bler, (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 m anufacturer and CDRH im m ediately. CAUTION MICROWAVE RADIATION PERSONNEL SHOULD NOT BE EXPOSED TO THE MICROWAVE ENERGY WHICH MAY RADIATE FROM THE MAGNETRON OR OTHER MICROWAVE GENERATING DEVICE IF IT IS IMPROPERLY USED OR CONNECTED. ALL INPUT AND OUTPUT MICROWAVE CONNECTIONS. WAVEGUIDE FLANGES AND GASKETS MUST BE SECURE. NEVER OPERATE THE DEVICE W ITHOUT A MICROWAVE ENERGY ABSORBING LOAD ATTACHED. NEVER LOOK INTO AN OPEN WAVEGUIDE OR ANTENNA WHILE THE DEVICE IS ENERGIZED. 2 SPECIFICATIONS MODEL POW ER SU PPLY POWER C O N S U M PT IO N M IC R O W AV E G R IL L C O M B IN ATIO N M ICRO WAVE ENERG Y O UTPUT M ICRO WAVE FREQ UENCY OUTSIDE DIMENSIONS (W X H X D) CAVITY DIMENSIONS (W X H X D) NET W EIG HT TIMER FUNCTION SELECTIONS POW ER SELECTIONS CAVITY VOLUM E KO R -164HBA 120V~60Hz, SINGLE PHASE W ITH GROUNDING 1500W 1100W 2450M Hz 589 x 339 x 486 m m (23.2 x 13.3 x 19.1 in.) 399 x 263 x 426 m m (15.7 x 10.4 x 16.8 in.) APPROX. 18.5 Kg ( 40.8 lbs.) 99 m in. 99 sec. M IC R O W AV E 10 LEVELS 1.6 Cu.Ft. SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE. 3 EXTERNAL VIEW 1. OUTER DIMENSION 589 M/W DEF TIMER LOCK Ib Ons Touch & Easy Cook BEVERAGE FROZEN VEGETABLE POPCORN FROZEN PIZZA FRESH VEGETABLE DINNER PLATE MORE LESS MEAT POULTRY FISH POWER DEFROST 12 3 45 6 78 9 KICHEN TIMER 0 CLOCK STOP/CLEAR START/SPEEDY COOK 339 486 4 EXTERNAL VIEW 2. FEATURE DIAGRAM M/W DEF TIMER LOCK Ib Ons Touch & Easy Cook BEVERAGE FROZEN VEGETABLE POPCORN FROZEN PIZZA FRESH VEGETABLE DINNER PLATE MORE LESS MEAT POULTRY FISH POWER 1 4 7 KICHEN TIMER DEFROST 23 56 89 0 CLOCK STOP/CLEAR START/SPEEDY COOK 1. DOOR SEAL Door seal maintains the microwave within the oven cavity and prevents microwave leakage. 2. DOOR HOOK When door is closed, it will automatically lock shut. If door is opened while oven is operating, magnetron tube will immediately stop operating. 3. DOOR SCREEN Allows viewing of food. Microwave cannot pass through perforations in screen. 4. SPATTER SHIELD Protects the microwave outlet from splashes of cooking foods. 5. OVEN LAMP Automatically turns on during oven operating. 6. SAFETY INTERLOCK SYSTEM 7. CONTROL PANEL 8. GLASS COOKING TRAY Made of special heat resistant glass. The tray must always be in proper position before operating. Do not cook food directly on the tray.. 9. OVEN FRONT PLATE 10. ROLLER GUIDE Supports the glass cooking tray. 5 EXTERNAL VIEW 3. CONTROL PANEL - KOR-164H0A M/W DEF TIMER LOCK g Ons Touch & Easy Cook BEVERAGE POPCORN FRESH VEGETABLE FROZEN VEGETABLE FROZEN PIZZA DINNER PLATE MORE LESS MEAT POULTRY FISH POWER DEFROST 12 3 45 6 78 9 KICHEN TIMER 0 CLOCK STOP/CLEAR START/SPEEDY COOK 1. Time set pad - Used to set the cooking time and the present time. 2. Display - Cooking time, 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 time to cooking. 5. Less - Used to remove time 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 time) 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 time. 6 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. 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 m ight be adversely affected and breakdowns occur. 5. Power supply Check your local power source. This microwave oven requires a current of approximately 12 am peres, 120 Volts, 60 Hz grounded outlet. Power supply cord is about 0.8 meters long. 1. A short power-supply cord is provided to reduce the risks resulting from becom ing entangled in or tripping over a longer cord. 2. Longer cord sets or extension cords are available and may be used if care is exercised in their use. 3. If a long cord or extension cord is used: 1) The marked electrical rating of the cord set or extension cord should be at least as great as the electrical rating of the appliance. 2) The extension cord must be a grounding type 3-wire cord. 3) The longer cord should be arranged so that it will not drape over the counter top or tabletop where it can be pulled on by children or tripped over unintentionally. 6. Examine the oven after unpacking for any damage such as: A m isaligned door, broken door or a dent in cavity. If any of the above are visible, DO NOT INSTALL, and notify dealer im m ediately. 7 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 m ust always be in place during cooking. 3. Close the door securely. 4. The oven door can be opened at any time 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. 5. Each time a pad is touched, a BEEP will sound to acknowledge the touch. 6. The oven automatically cook on full power unless set to a lower power level. 7. The display will show :0 when the oven is plugged in. 8. Time clock returns to the present tim e when the cooking time ends. 9. W hen the STOP/CLEAR pad is touched during the oven operation, the oven stops cooking and all information 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 information is retained. 10. If the START pad is touched and the oven does not operate, check the area between the door and door is closed securely. The oven w ill not start cooking under the door is com pletely closed or the program has been reset. Make sure the oven is properly installed and plugged into the electrical outlet. Wattage output chart The power level is set by pressing the PO W ER pad. The chart shows the display, the power level and the percentage of p o w e r. Touch POWER pad. O nce Tw ice 3 times 4 times 5 times 6 times 7 times 8 times 9 times 10 times 11 tim es Power level (Display) P-HI P-90 P-80 P-70 P-60 P-50 P-40 P-30 P-20 P-10 P-00 Approximate Percentage of Power 100 % 90 % 80 % 70 % 60 % 50 % 40 % 30 % 20 % 10 % 0 % 8 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 grounding. Do not operate on a two-wire extension cord. The microwave oven is designed to be used with grounded. It is imperative, therefore, to make sure it is grounded properly before beginning repair work. 2) Warning about the electric charge in the high voltage capacitor. For about 30 seconds after the operation stopped and electric charge remains in the high voltage capacitor. When replacing or checking parts, short between oven chassis and the negative high terminal of the high voltage capacitor, by using a properly insulated screwdriver to discharge. 4. When the 15A fuse is blown out due to the operation of the monitor switch; replace primary interlock switch, secondary interlock switch and interlock monitor switch. 5. After repair or replacement of parts, make sure that the screws are properly tightened, and all electrical connections are tightened. 6. Do not operate without cabinet. CAUTION Service personnel should remove their watches whenever working close to or replacing the magnetron. CAUTION When servicing the appliance, need a care of touching or replacing high potential parts because of electrical shock or exposing microvave. These parts are as follows - HV Transformer, Magnetron, HV Capacitor, HV Diode. 9 1. To remove cabinet 1) Remove three screws on cabinet back. 2) Push the cabinet backward. DISASSEMBLY AND ASSEMBLY 2. To remove door assembly 1) Remove two screws 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 After replacing the door assem bly, perform a check of correct alignm ent with the hinge and cavity front plate. 10 DISASSEMBLY AND ASSEMBLY 3. To remove door parts. A08 A11 A10 A12 A14 A03 A04 A07 A09 A13 A01 A02 A05 A06 REF. NO A01 A02 A03 A04 A05 A06 A07 A08 A09 A10 A11 A12 A13 A14 PART CODE 3512301800 3517005200 3515204400 3511710500 3513101600 3515102000 3517005350 3512203930 7001401211 3511607700 3511607900 3511607800 3511608000 3512603630 PART NAME GASKET DOOR BARRIER-SCREEN *I STOPPER HINGN *T AS DOOR PAINTING AS HOOK SPRING HOOK BARRIER-SCREEN *O FRAME DOOR SCREW MACHINE DECORATOR DOOR *T DECORATOR DOOR *L DECORATOR DOOR *U DECORATOR DOOR *R HANDLE DOOR DESCRIPTION PP PE T0.1 KOR-162J0A KOR-161H0A POM PW1 GLASS T3.2 ABS SG-175, SG-0760D PAN M14XL12 MFZN SUS T0.5 SUS T0.5 SUS T0.5 SUS T0.5 KOR-164HBA QTY 1 1 1 1 1 1 1 1 2 1 1 1 1 REMARK 2 (1) Remove the gasket door(A01) from door plate. (2) Remove the door frame (A08) from door plate. (3) Remove two screws(A09) from door plate. (4) Remove the door handle (A15) and handle supporter (A14) from door plate. (5) Remove the four door decorators (A10~A13) from door frame. (6) Remove the stopper hinge top(A03) from door plate. (7) Remove the spring(A06) and the hook(A05). (8) Remove the barrier screen outer(A07) from door frame. (9) Reverse the above steps for reassembly. 11 DISASSEMBLY AND ASSEMBLY 4. Method to reduce the gap between the door seal and the oven front surface. 1) To reduce gap located on part "A". Loosen two 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. M/W DEF TIMER LOCK Ib Ons Touch & Easy Cook BEVERAGE FROZEN VEGETABLE POPCORN FROZEN PIZZA FRESH VEGETABLE DINNER PLATE MORE LESS MEAT POULTRY FISH POWER 1 4 7 KICHEN TIMER DEFROST 23 56 89 0 CLOCK STOP/CLEAR START/SPEEDY COOK 3) To reduce gap located on part "C". Loosen a screw on interlock switch assem bly located top of oven body. Draw the interlock switch assembly inward as possible to engage with hook on the door bottom. Tighten a screw. 4) To reduce gap located on part "D". Loosen a screw on interlock switch assem bly located bottom of oven body. and (4) are same as step (3). NOTE A small gap may be acceptable if the microwave leakage does not exceed 4mW/cm2. 12 DISASSEMBLY AND ASSEMBLY 5. To remove control panel parts. B02 B01 B03 B04 B05 REF.NO PART CODE PART NAME D E S C R IP T IO N QTY B01 3518520890 SWITCH MEMBRANE KOR-164H0A 1 B02 3511608500 DECORATOR C-PANEL SUS T0.5 1 B03 3516719140 CONTROL-PANEL ABS SG-175, SG-0760D 1 B04 PKMPMSXL00 PCB MAIN MANUAL AS KOR-161G2A 1 B05 7112401211 SCREW TAPPING T2S TRS 4*12 MFZN 4 REMARK (1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly. (2) Remove four screws which secure the PCB assembly to control panel. (3) Disconnect membrane tail from the connector of the PCB assembly. (4) Detach membrane from the control panel. (5) Pull out the decorator c-panel from the control panel. (6) Reverse the above steps for reassembly. 13 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) Rem ove the H.V. diode from the capacitor holder. 3) Reverse the above steps for reassem bly. High voltage circuit wiring DISASSEMBLY AND ASSEMBLY 7. To remove magnetron. 1) Remove a screw which secure the magnetron. 2) Remove the magnetron. 3) Reverse the above steps for reassem bly. NOTE N ever install the magnetron w ithout the m etallic gasket plate w hich is packed w ith each m agnetron to prevent m icrowave leakage. W henever repair work is carried out on m agnetron, check the m icrowave leakage. It shall not exceed 4mW /cm 2 for a fully assembled oven with door normally closed. 14 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 motor shaft. 4) Remove two screws which secure the motor shaded pole. 5) Remove the motor shaded pole. 6) Reverse the above steps for reassem bly. 9. To remove H.V.transformer. 1) Rem ove four screws holding the H.V.transform er. 2) Remove the H.V.transformer. 3) Reverse the above steps for reassem bly. 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. (1) Primary 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. 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 NO condition and presses the button of the secondary interlock switch to bring it under ON condition. ADJUSTMENT Interlock monitor switch W hen the door is closed, the interlock m onitor sw itch should be changed(NO condition) before other switches are closed. W hen the door is opened, the interlock monitor sw itch should be changed(NC condition) after other switches are opened. (3) Adjustment steps a) Loosen the two mounting screws. b) Adjust interlock switch assembly position. c) Make sure that lock lever moves smoothly after adjustment is completed. d) Tighten completely two mounting screws. NOTE M icrow ave em ission test should be perform ed after adjusting interlock m echanism. If the m icrow ave em ission exceed 4mW /cm2, readjust interlock mechanism. 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) 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. NOTE W hen electric parts are checked, be sure the power cord is not inserted the wall outlet. Check wire harness, wiring and connected of the terminals and power cord before check the parts listed below. (TROUBLE 1) Oven does not operate at all : any inputs can not be accepted. C ON D ITIO N Fuse blows. CHECK Check continuity of interlock monitor switch with door closed Replace fuse C heck continuity of prim ary interlock switch contact with door partially open until interlock monitor switch contact close Check continuity of primary winding of low voltage transformer Disconnect one side of the lead wire connected form high voltage transformer to the high voltage capacitor and operate the unit R E S U LT C o n tin uity No Continuity C o n tin uity 0 or nfiniite Approx. 150~310 (n o rm a l) Normal Fuse again blows CAUSE M a lfu n ctio n of interlock m o n ito r s w itc h Shorted contacts of primary interlock switch. REMEDY R e p la c e NOTE 1 R e p la c e NOTE 1 Defective low voltage tra n s fo rm e r R e p la c e Defective high voltage capacitor Defective high voltage transformer R e p la c e R e p la c e 17 TROUBLE SHOOTING GUIDE C O N D IT IO N Outlet has proper voltage Fuse does not blow. CHECK Check continuity of m a g n e tro n Check continuity of power supply cord Display do not shown countdown RESULT No C o n tin u ity No C o n tin u ity N orm al CAUSE D e fe c tiv e m a g n e tro n Open power supply cord Defective touch control circuit Malfunction of secondary interlock switch REMEDY R e p la c e R e p la c e R e p la c e R e p la c e NOTE All these switches m ust be replaced at the sam e tim e, please refer to "Interlock M echanism And Adjustm ent". ( TROUBLE 2 ) Display shows all figures selected, but oven does not start cooking, even though desired program and time are set and start pad is tapped. C O N D IT IO N Turn table motor, and oven lam p do not turn on CHECK Check continuity of primary interlock switch Check continuity of secondary interlock switch Check D.C. voltage being supplied to RELAY (RY2) coil RESULT No C o n tin u ity No C o n tin u ity 0 V Approx 15 VDC CAUSE M a lfu n c tio n of primary interlock switch M a lfu n c tio n of secondary interlock switch D e fe c tiv e touch control circuit F a u lty contacts of RELAY (RY2) or open relay coil REMEDY Adjust or R e p la c e Adjust or R e p la c e R e p la c e R e p la c e 18 TROUBLE SHOOTING GUIDE ( TROUBLE 3 ) No microwave oscillation even though fan motor rotates. C O N D IT IO N No m icrowave oscillation CHECK Check continuity of high voltage capacitor terminals with wires rem oved Check continuity of high voltage rectifier in forward and backward direction with DC megger RESULT Continuity Continuity in backward direction Connect megger leads to magnetron terminal and magnetron body Continuity Check resistance of primary and secondary coil of high voltage tra n s fo rm e r Check continuity of magnetron with wires rem oved Check continuity of filament term inal of high voltage transformer 0 or No Continuity No Continuity Check D.C. voltage being supplied to RELAY (RY1) coil 0 V Approx 15 VDC CAUSE Defective high voltage transform er Defective high voltage rectifier Defective m a g n e tro n Defective high voltage transform er Defective m a g n e tro n Defective high voltage transform er Defective touch control circuit Faulty contacts of R E L AY (RY1) or open relay coil REMEDY Replace Replace Replace Replace Replace Replace Replace Replace 19 TROUBLE SHOOTING GUIDE ( TROUBLE 4 ) The following visual conditions indicate a probable defective touch control circuit or membrane switch a s se m b ly 1. Incomplete segments, 1) Segments missing. 2) Partical segments missing. 3) Digit flickering other than normal display slight flickering. 4) " : 0 " does not display when power is on. 2. A distinct change in the diplay are not on when they num bers is the display. 3. One or more digits in the diplay are not on when they should be. 4. Display indicates a number different from one touched. 5. Specific numbers (for example 2 or 3) will not display when the panel is touched. 6. Display does not count down or up with time cooking or clock operation. 7. Oven is programmable and cooks normally but no display shows. 8. Display obviously jumps in time while counting down. 9. Display counts down noticeably too fast while cooking. 10. Display does not show the time of day when clear pad is touched. 11. Oven lamp and turntable motor do not stop although cooking is finished. Check if the RELAY 2 contacts close if they are close, replace touch control circuit. C O N D IT IO N Display does not show programm ing at all, even if keyboard is touched. CHECK Check each pad for continuity of the membrane keyboard for the following keyboard check procedure RESULT N orm al A bnorm al CAUSE M a lfu n c tio n of touch control circuit of control box su b -a sse m b ly Malfunction of the membrane keyboard REMEDY R e p la c e control box su b -a sse m b ly Replace the m em brane keyboard NOTE B efore following the particular steps listed above in the trouble shooting guide for the m em brane keyboardís, failure, please check for the continuity of each wire-harness betw een the m em brane keyboard and P.C.B . assem bly. 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 wit the microwave oven supplied at rated voltage and operated at its maximum microwave power setting with a load of 1000 ± 5cc of potable water. 2. The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190 mm. 3. The oven and the empty vessel are at ambient temperature prior to the start of the test. The initial temperature of the water is 10 ± 2 ° C (50 ± 3.6 ° F). It is measured imm ediately before the water is added to the vessel. After addition of the water to the vessel, the load is imm ediately 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 maxim um difference between the ambient and final water temperature is 5K. 7. The microwave power output P in watts is calculated from the following formula: P = 4187 X T/t T is difference between initial and ending temperature. t is the heating time. The power measured should be B (Refer to SPECIFICATIONS) W ± 10.0 %. CAUTION 1. W ater load should be m easured exactly to 1 liters. 2. Input power voltage should be exactly specified voltage (Refer to SPECIFICATIONS). 3. Am bient temperature should be 20 ± 2° C (68 ± 3.6 ° F) Heating time for power output: A (second) B (W ) 70 64 60 56 52 49 47 44 42 40 38 600 650 700 750 800 850 900 950 1000 1050 1100 21 MEASUREMENT AND TEST 2. MICROWAVE RADIATION TEST CAUTION 1. Make sure to check the microwave leakage before and after repair of adjustment. 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 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 m icrowave energy. 5. Slowly approach the unit under test until the radiometer reads an appreciable microwave 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 20 ± 5 ° C (68 ± 9° F) in the 600 cc glass beaker with an inside diameter of approx. 95 mm(3.5 in.). M/W DEF TIMER LOCK Ib Ons Touch & Easy Cook BEVERAGE FROZEN VEGETABLE POPCORN FROZEN PIZZA FRESH VEGETABLE DINNER PLATE MORE LESS MEAT POULTRY FISH POWER 1 4 7 KICHEN TIMER DEFROST 23 56 89 0 CLOCK STOP/CLEAR START/SPEEDY COOK 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 assem bled oven with door normally closed must be less than 4mW/cm 2. 2) When measuring the leakage, always use the 5 cm (2 in.) space cone with probe. Hold the probe perpendicular to the cabinet and door. Place the space cone of the probe on the door, cabinet, door seem , door viewing screen, the exhaust air vents and the suction air vents. 3) Measuring should be in a counter-clockwise direction at a rate of 1 in./sec. If the leakage of the cabinet door seem is unknown, 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 metal. If it does not, erroneous reading may result. 22 MEASUREMENT AND TEST 3. COMPONENT TEST PROCEDURE High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle. It is neither necessary nor advisable to attempt measurement of the high voltage. Before touching any oven components or wiring, always unplug the oven from its power source and discharge the capacitor. 1. High voltage transformer 1) Rem ove connections from the transform er term inals and check continuity. 2) Normal readings should be as follows : Secondary winding ... Approx. 110 ± 10% Filament winding ... Approx. 0 Primary winding ... Approx. 1 2. High voltage capacitor 1) Check continuity of capacitor with meter on the highest OHM scale. 2) A normal capacitor will show continuity for a short time, and then indicate 10M 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. once the capacitor charged. 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 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 may be read in both directions. A normal diode's resistance will be infinite in one direction and several hundred k in the other direction. 4. Magnetron For complete magnetron diagnosis, refer to ìMeasurement of the Microwave 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 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 sam e tim e. Replace just the fuse if the switches operate norm ally. 23 WIRING DIAGRAM 24 PRINTED CIRCUIT BOARD 1. CIRCUIT CHECK PROCEDURE 1. Low voltage transformer check The low voltage transform er is located on the P.C.B. Measuring condition: Input voltage: 120 V / Frequency: 60Hz Term inal Voltage 4 - 7 LOAD AC 12.6 V NO LOAD AC 14.7 V NOTE 1. Refer to Circuit Diagram (point 4). 2. Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source voltage. 3. The allowable tolerance of the secondary voltage is within 5% of nominal voltage. 2. Voltage Check - Key check point NO CHECK POINT 1 IC1 PIN 2,21,30,34 2 IC1 IN 3P5 -5VDC 3 IC1 PIN 31 OR 32 REMARK T : 16.67 ms(60Hz) T : 250 ns(4MHz) - Check method NO MEASURE POINT 1 MP1 2 MP2 WAVE FORM DC -5V±0.25V DC -12V±2.0V REMEDY Replace VL1, EC1 Replace EC2, D12,13,14 NOTE Each measure point must be measured with GND points. REMARK NO LOAD NO LOAD 25 PRINTED CIRCUIT BOARD MP1 MP2 Measure Point 26 PRINTED CIRCUIT BOARD 3. When there is no microwave oscillation 1) When touching START pad, oven lamp does not turn on. Fan motor do not rotate, but cook indicator in display comes on. Cause : RELAY 2 does not operate. refer to Circuit Diagram ( Point 3) - Check method STATE RELAY 2 ON RELAY 2 OFF POINT A - 5VDC GND 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 STATE RELAY 1 ON RELAY 1 OFF P O IN T A -5VDC GND B GND - 12VDC B GND -12VDC 4. When the door is opened during operation, the count down timer does not stop. refer to Circuit Diagram( Point 1 ) - Check method STATE P O IN T 1) DOOR OPEN 2) DOOR CLOSED A OPEN CLOSE B -5VDC GND CHECK NO 1 METHOD Check the stage(ON,OFF) of the secondary interlock switch by resistance m easurem ent. REMEDY Replace secondary interlock switch. 5. When the digital clock does not operate properly. refer to Circuit Diagram( Point 5 ) POINT WAVE FORM A T: 16.67 m s(60H z) If clock does not keep exact time, you must check resistor R15,16, zener diodeZD1. 27 2. PCB CIRCUIT DIAGRAM PRINTED CIRCUIT BOARD 28 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) PRINTED CIRCUIT BOARD 3. P.C.B. LOCATION NO. NO NAME 1 BUZZER 2 C ARRAY 3 CAPACITOR ELEC 4 CAPACITOR ELEC 5 CONNECTOR WAFER 6 CONNECTOR WAFER 7 CONNECTOR WAFER 8 DIODE RECTIFY 9 DIODE RECTIFY 10 DIODE ZENER 11 D IOD E ZEN ER 12 LED DISPLAY 13 PCB MAIN 14 R ARRAY 15 RESISTOR 16 RESISTOR 17 RESISTOR 18 RESISTOR 19 RESISTOR 20 RESISTOR 21 RESISTOR 22 REGULATOR 23 TRANSISTOR 24 TRANSISTOR 25 TRANS POWER 26 W IRE COPPER 27 W IRE COPPER 28 IC MICOM 29 RESONATOR CERA 30 SW RELAY 31 SW RELAY 32 CAPACITOR CERA 33 CAPACITOR CERA SYMBOL BZ1 CA1 EC1 EC2 CN1 CN2 CN3 D1~6,9~12 D13,14 ZD1 ZD2 DP1 M158 RA1 R1~R7 R8,10,12,14,22 R 11 ,2 0 ,2 1 R13 R15~17 R18 R19 VL1 Q 1 ~ 5 ,9 ~ 11 Q6 LV T 1 J1-J21 SJ2,3,5 IC1 CR1 RY1 RY2 C6 C 1 ~ 5 ,C 7 S P E C IF IC A T IO N BM-20K 7P(6) 102 M 50V 16V RSS 100uF 25V RSS 1000uF Y W 396-02AV Y W 396-05AV F C Z 2 5 4 -11 1N4148 1N4002A MTZ 5.1VB 1/2W MTZ 3.9VB 1/2W D D G -6 3 1H 8 1 .5 X 1 3 9 .9 7P(6) 1/8 100K J 1/6W 330 5% 1/6W 1K 5% 1/6W 100K 5% 1/6W 100 5% 1/6W 10K 5% 1/6W 1M 5% 1/4W 51 5% MC7905C KRA-102M K TA -1 2 7 0 Y DMR-631P 1/0.52 TIN COATING 1/0.52 TIN COATING TMP47C440BN K B R -4 .0 M S T F G5G-1A DC12V G5B-1 DC12V 102 50V Z AXIAL 104 50V Z AXIAL PART CODE 3515600100 CN6XB-102M CEXF1C101V CEXF1E102V 3519150520 3519150510 441M 367160 DZN4148--DZN4002A-DZTZ5R1B-DZTZ3R9B-DDDG631H-3514315410 RA-87X104J RD-AZ331JRD-AZ102JRD-AZ104JRD-AZ101JRD-AZ103JRD-AZ105JRD-4Z510J1M C 7905C -T Z R A 102M -T Z TA 1 2 7 0 Y 5EPU035302 85801052GY 85801052GY 13GS631GH0 5P K B R40M K S 5SC 0101121 5 S C 0 1 0 111 0 CCZB1H102K CCZF1H104Z Q 'TY 1 1 1 1 1 1 1 10 2 1 1 1 1 1 7 5 3 1 3 1 1 1 8 1 1 21 3 1 1 1 1 1 6 EXPLODED VIEW AND PARTS LIST 1. DOOR ASSEMBLY Refer to Disassem bly and assem bly. 2. CONTROL PANEL ASSEMBLY Refer to Disassem bly and assem bly. 3. TOTAL ASSEMBLY 30 EXPLODED VIEW AND PARTS LIST REF NO A00 B00 F01 F02 F03 F04 F05 F06 F07 F08 F09 F10 F 11 F12 F13 F14 F15 F16 F17 F18 F19 F20 F21 F22 F23 F24 F25 F26 F27 F28 F29 F30 F31 F32 F33 F34 F35 PART CODE 3 5 11 7 1 0 4 6 0 PKCPSW KN20 3510802420 7 11 2 4 0 1 0 11 3516004100 7 11 2 4 0 3 0 11 3963822200 3512514200 3 5 11 8 0 0 5 0 0 3513003200 7S422X4081 3518400400 3518302200 3513601500 3513815900 4415A17352 4415A66910 4415A17352 4415A6660 3513702600 3512714650 3516003800 3518003500 3510311800 3516003700 3 5 1 8 11 4 2 5 0 7 1 2 1 4 0 0 6 11 3966820200 3513003400 3518906400 3512101400 7 11 2 4 0 1 0 11 7S422X4081 3515202800 3517400600 3514700710 3512517200 PART NAME D E S C R IP T IO N DOOR AS KOR-161G2A CONTROL PANEL AS KOR-164HBA C A B IN E T SUS430T0.5 SCREW TAPPING T1 TRS 4*10 MFZN SCREW TAPPING T2S TRS LR POLE 4*10 SEMFZN SCREW TAPPING T1 TRS 4*30 MFZN MOTOR SAHDED POLE 120V 30W OEM-15DWX1-B07 GUIDE W IND PP FAN PP GF20 HOLDER CAPACITOR SECC T0.6 SPECIAL SCREW TT2 TRS 5*8 SE MFZN DIODE HV HVR-1X-3AB 12KV #187 CAPACITOR HV 2100VAC 0.98UF #187 LAMP BL 125V 25W T25 C5A H187 LOCK PP SW MICRO VP-533A-OF SPNO #187 200G SW MICRO VP-531A-OF/SZM -V16-FA-6 SW MICRO VP-533A-OF SPNO #187 200G SW MICRO VP-532A-OF SPNO *187 200G LEVER LOCK POM HARNESS MAIN KOR-161H2A SPECIAL SCREW T2 FLANGE 5*8 MFZN MAGNETRON RM259(JF) BASE SBHG T0.8 SPECIAL SCREW TT3 HEX 4*9 FLG MFZN TRANS HV DWARLLAO- 1 6 T SCREW TAPPING T2S PAN 4*6 M FZN MOTOR SYNCRO 120V 2W GM-16-12F17 HO LDER THERMO STAT PBT THERM OSTAT OFF : 85 ON : 75 H #187 NB FOOT DASF-310 SCREW TAPPING T1 TRS 4*10 MFZN SPECIAL SCREW TT2 TRS 4*8 SE MFZN STOPPER HINGE UNDER AS KOR-121M0A COUPLER ZAREC ROLLER TEFLON GUIDE ROLLER PP Q'TY 1 1 3 4 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 4 1 1 1 1 1 4 5 1 1 1 3 1 31 EXPLODED VIEW AND PARTS LIST REF NO F36 F37 F38 F39 F40 F41 F42 F43 F44 F45 PART CODE 4419W 88004 3515202900 3 5 11 4 0 3 2 0 0 3516003700 3516109810 7 1 2 2 4 0 1 2 11 7 1 2 2 4 0 1 2 11 4413A90012 7 11 2 4 0 1 0 11 3 5 11 3 U H W T 5 PART NAME T RAY STOPPER HINGE TOP AS COVER WAVE GUIDE SPECIAL SCREW CAVITY AS SCREW TAPPING SCREW TAPPING CLAMP POWER CORD SCREW TAPPING CORD POWER AS D E S C R IP T IO N GLASS 1350G K O R -121M 0A HEATPROOF PP TT3 HEX 4*8 FLG MFZN KOR-161G2A T2S TRS 4*12 MFZN T2S TRS 4*12 MFZN NYLON 66 T1 TRS 4*10 MFZN 3*14AWG90*90120-RTML Q'TY 1 1 1 2 1 2 1 1 1 1 32 S/M NO. : DAEWOO ELECTRONICS CO., LTD. 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: "DAEWOOELEC" PRINTED DATE: DEC, 2006