Electrolux EMC3065X Service Manual

599 38 84-81 SERVICE MANUAL MICROWAVE OVENS © ELECTROLUX HOME PRODUCTS Corso Lino Zanussi,30 Publication No. I - 33080 PORCIA /PN (ITALY) 599 38 84-81 Tel +39 0434 394850 Fax +39 0434 394096 SOI Edition: 05.2007 EN/SERVICE/FV Microwave Oven EMC3065X (947608328)

DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY (a)Do not operate or allow the oven to be operated with the door open. (b)Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs if necessary: (1) Interlock operation, (2) Proper door closing, (3) Seal and sealing surfaces (arcing, wear, and other damage), (4) Damage to or loosening of hinges and latches (5) Evidence of dropping or abuse. (c) Before turning on power to the microwave oven for any service test or inspection within the microwave generating compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment, integrity, and connections. (d)Any defective or misadjusted components in the interlock, monitor, door seal and microwave generation and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual before the oven is released to the owner. TABLE OF CONTENTS 1. SAFETY AND PRECAUTIONS....................................................................................................................................3 2. SPECIFICATIONS ........................................................................................................................................................4 3. EXTERNAL VIEW.........................................................................................................................................................5 3-1. OUTER DIMENSION..........................................................................................................................................5 3-2. FEATURE DIAGRAM .........................................................................................................................................6 4. INSTALLATION ............................................................................................................................................................7 5. CONTROL PANEL .......................................................................................................................................................8 6. DISASSEMBLY AND ASSEMBLY..............................................................................................................................8 7. INTERLOCK MECHANISM AND ADJUSTMENT.....................................................................................................18 8. TROUBLE SHOOTING GUIDE..................................................................................................................................19 9. MESUREMENT AND TEST .......................................................................................................................................24 9-1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ........................................................................24 9-2. MICROWAVE RADIATION TEST....................................................................................................................25 9-3. COMPONENT TEST PROCEDURE................................................................................................................26 9-4. COMPONENT ACTION....................................................................................................................................27 10. WIRING DIAGRAM...................................................................................................................................................28 2

1. FOR SAFE OPERATION Damage that allows the microwave energy (that cooks or heats the food) to escape will result in poor cooking and may cause serious bodily injury to the operator. IF ANY OF THE FOLLOWING CONDITIONS EXIST, OPERATOR MUST NOT USE THE APPLIANCE. (Only a trained service personnel should make repairs.) (1) A broken door hinge. (2) A broken door viewing screen. (3) A broken front panel, oven cavity. (4) A loosened door lock. (5) A broken door lock. The door gasket plate and oven cavity surface should be kept clean. No grease, soil or spatter should be allowed to build up on these surfaces or inside the oven. DO NOT ATTEMPT TO OPERATE THIS APPLIANCE WITH THE DOOR OPEN. The microwave oven has concealed switches to make sure the power is turned off when the door is opened. Do not attempt to defeat them. DO NOT ATTEMPT TO SERVICE THIS APPLIANCE UNTIL YOU HAVE READ THIS SERVICE MANUAL. 2. FOR SAFE SERVICE PROCEDURES. 1. If the oven is operative prior to servicing, a microwave emission check should be performed prior to servicing the oven. 2. If any certified oven unit is found to servicing, a microwave emission check should be performed prior to servicing the oven. (1) inform the manufacturer, importer or assembler, (2) repair the unit at no cost to the owner, (3) attempt to ascertain the cause of the excessive leakage, (4) 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 immediately. IMPORTANT The wire in this mains lead coloured in accordance with the following code. Green-and-yellow : Earth Blue : Neutral Brown : Live As the colours of the wires in the mains lead of this appliance may not correspond with the coloured markings identifying the terminals in your plug, proceed as follows: The wire which is coloured green-and-yellow must be connected to the terminal in the plug which is marked with the letter E , earth symbol or coloured green-and-yellow. The wire which is coloured blue must be connected to the terminal which is marked with the letter N or coloured black. The wire which is coloured brown must be connected to the terminal which is marked with the letter L or coloured red. NOTE : This oven is designed for counter-top use only. 3

MICROWAVE 1450W POWER CONSUMPTION GRILL 850W CONVECTION 2250W 1450W COMBINATION 2950W 1450W MICROWAVE ENERGY OUTPUT 900W (IEC 705) MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 542X329X515mm(21.3X13.0X20.3 in.) CAVITY DIMENSIONS (W X H X D) 350X230X355mm(13.8X9.1X14.0 in.) NET WEIGHT Approx. 18Kg (39.6 lbs.) TIMER 60 minutes FUNCTION SELECTIONS Microwave / Grill / Convection / Combination POWER SELECTIONS 10 LEVELS CAVITY VOLUME 1.0 Cu. Ft * SPECIFICATION ARE SUBJECT TO CHANGE WITHOUT NOTICE. 2. SPECIFICATIONS

When the door is closed, it will automatically lock shut. If door is opened while oven is operating, the magnetron will immediately stop operating. 12. DOOR VIEWING SCREEN Allows viewing of food. The screen is designed so that light can pass through, but not the microwave. 13. METAL RACK 14. TOP HEATER Turns on when convection, grill and combi cooking is selected. 15. OVEN LAMP Automatically turns on during oven operating. 16. SAFETY INTERLOCK SYSTEM 17. CONTROL PANEL 18. TURNTABLE TRAY Rotates during cooking and ensure even distribution of Microwaves. It can also be used as a cooking utensil. 19. ROLLER GUIDE This must always be used for cooking together with the turntable tray. 10. COUPLER This fits over the shaft in the center of the ovens cavity floor. This is to remain in the oven for all cooking. 11. CONVECTION OUTLET & FAN 12. OVEN FRONT PLATE 13. DOOR SEAL Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage. 14. BARBECUE BAR (KOC-9N7T7SA2 ONLY) This is used barbecue cooking. 2. FEATURE DIAGRAM

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 13 amperes, 230V, 50Hz. Power supply cord is about 1.0 meters long. The voltage used must be the same as specified on this oven. Using a higher voltage may result in a fire or other accident causing oven damage. Using low voltage will cause slow cooking. We are not responsible for damage resulting from use of this oven with a voltage of ampere fuse other than those specified. This appliance is supplied with cable of special type, which, if damaged, must be repaired with cable of same type. Such a cable can be purchased from DAEWOO and must be installed by a Qualified Person. 6. Examine the oven after unpacking for any damage such as: A misaligned door, broken door or a dent in cavity. If any of the above are visible, DO NOT INSTALL, and notify dealer immediately. 7. Do not operate the oven if it is colder than room temperature. This appliance must be earthed. In the event of an electrical short circuit, earthing reduces the risk of the electric shock by providing an escape wire for the electric current. This appliance is equipped with a cord having a earthing wire with a earthing plug. The plug must be plugged into an outlet that is properly installed and earthed. 4. INSTALLATION EARTHING INSTRUCTIONS WARNING Improper use of the earthing plug can result in a risk of electric shock. Consult a qualified electrician of serviceman if the earthing instructions are not completely understood, or if doubt exists as to whether the appliance is properly earthed, and either: If it is necessary to use an extension cord, use only a 3-wire extension cord that has a 3-blade earthing plug, 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. 7

1 Display : Cooking time, power level, indicators and present time are displayed. MW : When blinking, the oven is operating in MICROWAVE COOK. Grill : When blinking, the oven is operating in GRILL. Combi : When blinking, the oven is operating in COMBI. Defrost Weight : When blinking, the oven is operating in WEIGHT DEFROST. Time : When blinking, the oven is operating in TIME DEFROST. Auto-cook : When blinking, the oven is operating AUTO COOK. Lock : When lighting, the oven is CHILD LOCK. Con-vection : When blinking, the oven is operating in CONVECTION. g : When blinking, the oven is operating in weight input mode. Barbecue : When blinking, the oven is operating in barbecue. (KOC-9N7T7SA2 only) 2 Auto cook : Used to cook or reheat. 3 Combi : Used to select combi. 4 Weight Defrost : Press to select the weight defrosting cooking. (KOC-9N4T7S/9N4T7S24/9N5T7S/9N5T7R/ 9N5T7S21/9N7T7S/9N7T7S21 only) Auto Defrost : Press to select the auto defrosting cooking. (KOC-9N7T7SA2 only) 5 Grill : Used to select grill. 6 MW : Used to set power level of micro wave. 7 Time Defrost : Press to select the time defrosting cooking. (KOC-9N4T7S/9N4T7S24/9N5T7S/9N5T7R/ 9N5T7S21/9N7T7S/9N7T7S21 only) Barbecue : Press to select the barbecue cooking. (KOC-9N7T7SA2 only) 8 Convection : Used to select convection and selected temp. 9 Clock : Used to set clock. 0 Dial knob : Used to set time, weight and quantity. q START/SPEEDY COOK : Used to start a programmed, also for speedy start(each press adds 30 seconds microwave cooking time). w STOP/CLEAR : Used to stop the oven operation or to delete the cooking data.

- Cautions to be observed when trouble shooting. Unlike many other appliances, the microwave oven is high-voltage, high-current equipment. It is completely safe during normal operation. However, carelessness in servicing the oven can result in an electric shock or possible danger from a short circuit. You are asked to observe the following precautions carefully. 1. Always remove the power plug from the outlet before servicing. 2. Use an insulated screwdriver and wear 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 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 has stopped, 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 fuse is blown out due to the operation of the monitor switch; replace primary interlock switch, secondary interlock switch and interlock monitor switch. 5. After repair or replacement of parts, make sure that the screws are properly tightened, and all electrical connections are tightened. 6. Do not operate without cabinet. CAUTION : Service personnel should remove their watches whenever working close to or replacing the magnetron. WARNING : When servicing the appliance, take care when touching or replacing high potential parts because of electrical shock or exposing microwave. These parts are as follows - HV Transformer, Magnetron, HV Capacitor, HV Diode. 9

1) Remove four screws on cabinet back. 2) Push the cabinet backward. 2. To remove door assembly 1) Remove two screws which secure the stopper hinge top. 2) Remove the door assembly from top plate of cavity. 3) Reverse the above for assemby. NOTE: After replacing the door assembly, perform a check of correct alignment with the hinge and cavity front plate. 10

1 A03 3512204820 FRAME DOOR ALLOY PC+ABS 1 A04 7001503011 SCREW MACHINE PAN 5*30 MFZN 2 A05 3515101800 SPRING HOOK PW1 1 A06 3513101200 HOOK POM 1 A07 3512302400 GASKET DOOR PBT 1 A08 3516602200 DOOR PLATE SBHG-3A T0.7 1 A09 3515304800 SUPPORTER HINGE*T SCP-1 T2.0 1 A10 3517007120 BARRIER-SCREEN *O GLASS T3.2 1 3517007130 BARRIER-SCREEN *O GLASS T3.2 MIRROR 1 KOC-9N4T7S24 ONLY A11 3511608700 DECORATOR DOOR*T SUS430 T0.5 H/L 1 A12 3511608400 DECORATOR DOOR*L SUS430 T0.5 H/L 1 A13 3511608200 DECORATOR DOOR*U SUS430 T0.5 H/L 1 3. To remove door parts. 1) KOC-9N4T/9N5T (1) Remove the gasket door from door plate. (2) Remove the door frame from door plate. (3) Remove screws from door frame. (4) Remove the handle from door frame. (5) Remove the decorator door from door frame. (6) Remove the stopper hinge top from door plate. (7) Remove the spring and the hook. (8) Remove barrier screen outer from door frame. (9) Reverse the above steps for reassembly. ✔ 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

(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. NOTE : A small gap may be acceptable if the microwave leakage does not exceed 4mW/cm2.

1 B02 3515501820 WINDOW DISPLAY PMMA 1 B03 3511608110 DECORATOR C-PANEL SUS430 T0.5 H/L 1 B04 3516005600 SPECIAL DOUBLE TAPE HOSTIC 550M(D)TO.15 1 B05 3516725260 CONTROL-PANEL ABS XR-401 SG-0320G 1 B06 3516909080 BUTTON FUNCTION-A ABS SG-175 SG-0760D SPRAY 1 B07 71222401211 SCREW TAPPING T2S TRS 4*12 MFZN 4 PKMPMSA200 PCB MAIN AS KOC-9N4T7S 1 KOC-9N5T7S, B08 9N5T7S21 PKMPMSA220 PCB MAIN AS KOC-9N5T7R 1 KOC-9N5T7R B09 7121301011 SCREW TAPPING T2S PAN 3*10 MFZN 5 B10 PKBPMSA200 PCB SUB AS KOC-9N4T7S 1 B11 3516909090 BUTTON FUNCTION-B ABS SG-175 SG-0760D SPRAY 1 (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(B07) which secure the PCB Main ASS’Y. (3) Pull out the Main PCB assembly(B08). (4) Remove four screws(B09) which secure the PCB Sub ASS’Y. (5) Pull out the Sub PCB assembly(B10). (6) Pull out the Knob volume(B01) from the Sub PCB assembly. (7) Pull out ten buttons from the control panel. (8) Pull out Decorator control panel(B03) from the control panel. (9) Pull out Window display(B02) from the control panel. (10)Reverse the above steps for reassembly. ✔ 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

prevent microwave leakage. Whenever repair work is carried out on magnetron, check the microwave leakage. It shall not exceed 4mW/cm2 for a fully assembled oven with door normally closed. Magnetron antenna Metallic gasket plate Cooling fin Filament terminal 6. To remove high voltage capacitor. 1) Remove a screw which secure the grounding ring terminal of the H.V. diode and the capacitor holder. 2) Remove the H.V. diode from the capacitor holder. 3) Reverse the above steps for reassembly. High voltage circuit wiring 7. To remove magnetron. 1) Remove a screw which secure the magnetron. 2) Remove the magnetron. 3) Reverse the above steps for reassembly.

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 reasembly. 9. To remove H.V.transformer. 1) Remove four screws holding the H.V.transformer. 2) Remove the H.V.transformer. 3) Reverse the above steps for reassembly.

1) Remove a screw and pull out Guide air outlet . 2) Remove screws and pull out braket heater *T . 3) Pull out heater miraclon 4) Remove two screws . 5) Pull out the heater reflector from cover heater *T . 6) Reverse the above steps for reassembly. REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK 1 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 1 2 3512520500 GUIDE AIR OUTLET SA1D T0.5 1 3 3512804900 HEATER REFLECTOR STS430 T0.5 1 4 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 2 5 3510607700 BRACKET HEATER *T SA1D T0.5 2 6 3512805800 HEATER MIRACLON 230V 800W 270MM 1 7 3511410300 COVER HEATER *T SA1D T0.5 1 ✔ 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 1 2 6 . 7 3 9 4 8 5 1 2 3 4 6 7

1) Remove a screw and pull out Cover motor *B . 2) Remove a screw and pull out Cover *B . 3) Pull out the Harness convection-B . 4) Remove four screws and then pull out the Rear heater assembly. 5) Remove a Nut and the pull out the Fan convection . 6) Remove three screws and then separate the Cover heater *B and the lnsulator heater *B . 7) Pull out the Heater from the Cover Heater *B . 8) Remove two screw and then separate the lnsulator heater *B and Motor shaded pole . 9) Remove the C-Ring and then pull out the Fan from Motor shaft. 10)Reverse the above steps for reassebly. 14 15 16 17 2 3 4 5 6 7 8 9 10 11 12 13 1 REF NO. PART CODE PART NAME DESCRIPTION Q TY REMARK 2 3511407300 COVER MOTOR*B SA1D-80 T0.5 1 1 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 1 3 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 1 4 3511407900 COVER*B SA1D-80 T0.5 1 5 3512767611 HARNESS CONVECTION KOC-924T0S ALTERNATE 1 6 7113400814 SCREW TAPPING T1 BIN 4*8 MFNI 4 8 3511409800 COVER HEATER*B SA1D-80 T0.5 1 7 3513303400 INSULATOR HEATER*B SBHG-1 T0.5 1 9 7113400814 SCREW TAPPING T1 BIN 4*8 MFNI 3 10 3511800700 FAN CONVECTION SA1D-80 T0.5 1 11 3513002300 HOLDER HEATER SUS 304 T0.5 3 12 3512801800 HEATER 230V 1400W 1R18344 1 13 7400104011 WASHER PLAIN PW-1-4 MFZN 1 14 7601400811 SCREW MACHINE PAN 4*8 SW MFZN 2 15 3963514330 MOTOR SHADED POLE 230V 50Hz MW10CA-T03 1 16 3511800900 FAN PBT 1 17 7402704600 RING C CR-5 SK5 1 ✔ 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 1 2 3 4 5 6 e 0 9 7 8 w 7 r 8 t u y

The door lock mechanism is a device which has been specially designed to completely eliminate microwave radiation when the door is opened during operation, and thus to perfectly prevent the danger resulting from the leakage of microwave. (1) Primary interlock switch When the door is closed, the hook locks the oven door. If the door is not closed properly, the oven will not operate. When the door is closed, the hook pushes the button of the microswitch. Then the button of the primary interlock switch bring it under ON condition. (2) Secondary interlock switch and interlock monitor switch When the door is closed, the hook pushes the lock lever downward. The lock lever presses the button of the interlock monitor switch to bring it under OFF condition and presses the button of the secondary interlock switch to bring it under ON condition. (3) Adjustment steps a) Loosen the one mounting screw. b) Adjust interlock switch assembly position. c) Make sure that lock lever moves smoothly after adjustment is completed. d) Tighten completely two mounting screws. ADJUSTMENT : Interlock monitor switch When the door is closed, the interlock monitor switch should be opened before other switches are closed. When the door is opened, the interlock monitor switch should be closed after other switches are opened. NOTE : Microwave emission test should be performed after adjusting interlock mechanism. If the microwave emission exceed 4mW/cm2, readjust interlock mechanism.

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 tranformer, disconnect one load wire from these parts and check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter. (TROUBLE 1) Oven does not operate at all : any inputs can not be accepted. NOTE : When electric parts are checked, be sure the power cord is not inserted the wall outlet. Check wire harness, wiring and connection of the terminals and power cord before check the parts listed below. CONDITION CHECK Check continuity of interlock monitor switch with door closed ( COM NC ) Check continuity of both primary and secondary interlock switch with door closed Malfunction of Interlock monitor switch Malfunction of interlock switch RESULT Continuity No continuity CAUSE REMEDY Replace (COM NC) Fuse blows. Replace Shorted contacts of primary interlock Switch Continuity Replace Check continuity of primary interlock switch contact with door partially open until interlock monitor switch contact close ( COM NC close ) Defective low voltage transformer Defective high voltage transformer or infinite Replace Replace Check continuity of primary winding of low voltage transformer Disconnect high voltage fuse and operate the unit No Continuity Continuity Approx. 480 ~620 ( normal ) Fuse again blows

magnetron Defective magnetron. RESULT No continuity CAUSE REMEDY Replace Outlet has proper voltage fuse does not blow? Check continuity of noise filter board Defective line filter board No continuity Replace Check continuity of power supply cord Defective touch control circuit Replace Open power supply cord No continuity No continuity Replace NOTE : All these switches must be replaced at the same time, please refer to (7.Interlock mechanism and adjust) for adjustment instructions (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 tapped. CONDITION CHECK Check continuity of primary interlock switch Malfunction of primary interlock switch RESULT No continuity CAUSE REMEDY Adjust or replace Turn table motor and oven lamp do not turn on Check D.C voltage being supplied to RELAY(RY4) coil Fault contacts of RELAY (RY4) or open relay coil. Replace Check continuity of secondary interlock and D.O.M switch Malfunction of secondary Interlock and D.O.M switch No continuity Adjust or replace Defective touch control Circuit 0V Approx. 24V DC Replace

CONDITION CHECK RESULT Check continuity of high voltage capacitor terminals with wires removed Continuity CAUSE Defective high voltage transformer Defective high voltage fuse REMEDY 1 Replace No microwave oscillation Check continuity of high voltage rectifier in forward and backward direction with DC megger Continuity in backward direction Defective high voltage rectifier Replace Connect megger leads to magnetron terminal and magnetron body Continuity Defective magnetron 2 1 Check resistance of primary and secondary coil of high voltage transformer 0 or Defective high voltage transformer Replace Check continuity of high voltage fuse No microwave oscillation No continuity 2 Check continuity of magnetron heater with wires removed No continuity Defective magnetron Replace 1 Check continuity of filament terminal of high voltage transformer No continuity Defective high voltage transformer Replace Check D.C voltage being supplied to RELAY (RY1) coil 0 V Defective touch control circuit Replace Approx. 24V DC Faulty contacts of RELAY (RY1) or open relay coil Replace

CONDITION CHECK Check continuity of primary interlock switch Malfunction of primary Interlock switch RESULT No continuity CAUSE REMEDY CAUSE REMEDY Adjust or replace Grill heater is not heated. Check D.C voltage being supplied to RELAY (RY2) coil Faulty contacts of RELAY (RY2) or open relay coil Replace Check continuity of secondary interlock switch Malfunction of secondary interlock switch No continuity Adjust or replace Defective touch control circuit 0V Approx. 24V DC Replace Check continuity of heater Defective heater No continuity Replace (TROUBLE 5) 1) Convection heater is not heated; food will not become hot. 2) Convection fan motor does no rotate. CONDITION CHECK Check continuity of primary interlock switch Malfunction of primary Interlock switch RESULT No continuity Adjust or replace 1)Convection heater is not heated. 2)Convection fan and motor does not rotate. Check D.C voltage being supplied to RELAY (RY3, RY6) coil Faulty contacts of RELAY (RY3,RY6) or open relay coil Replace Check continuity of secondary interlock switch Malfunction of secondary interlock switch No continuity Adjust or replace Defective touch control circuit 0V Approx. 24V DC Replace Check continuity of (heater or motor) Defective motor No continuity Replace

continuity of the button Malfunction of sub pcb assembly RESULT Normal CAUSE REMEDY Replace control box sub-assembly Display does not show programming at all, even if keyboard is touched. (TROUBLE 6) The following visual conditions inditions indicate a probable defective touch control Circuit or button P.C.B. assembly 1. Incomplete segments. 1) segment missing 2) partial segments missing 3) digit flickering other than normal fluorescent slight flickering 2. A distinct change in the brightness of one or more numbers exists in the display. 3. One or more digits in the display are not on when they should be. 4. Display does not count down or up with time cooking or clock operation. 5. Oven is programmable and cooks normally but no display shows. 6. Display obviously jumps in time while counting down. 7. Display counts down noticeably too fast while cooking. 8. Display does not show the time of day when clear button is touched. 9. Oven lamp and turn table motor do not stop although cooking is finished. Check if the RELAY(RY4) contacts close and if they are close, replace touch control circuit. CAUSE REMEDY (TROUBLE 7) When ERROR 2 ERROR 3 come on display. CONDITION CHECK Check continuity of thermistor (resistance of thermistor) Replace RESULT 0 or infinite Replace ERROR 2 & ERROR 3 come on display Check continuity of heater (convection, upper, lower) Defective touch control circuit Replace Approx 200~300k (room temperature) Defective heater No continuty continuity Replace

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. A cylindrical container of borosilicate glass is used for the test. It has a maximum thickness of 3mm, an external diameter of approximately 190mm and a height of approximately 90mm. The mass of the container is determined. 2. At the start of the test, the oven and the empty container are at ambient temperature. Water having an initial temperature of 10 C 1 C is used for the test. The water temperature is measured immediately before it is poured into the container. 3. A quantity of 1000g 5g of water is added to the container and its actual mass obtained. The container is then immediately placed in the centre of the oven shelf, which is in its lowest normal position. The oven is operated and the time for the water temperature to attain 20 C 2 C is measured. The oven is then switched off and the final water temperature is measured within 60s. NOTE 1 - The water stirred is before its temperature is measured. NOTE 2 - Stirring and measuring devices are to have a low heat capacity. 4. The microwave power output is calculated from the formula where P is the microwave power output, in watts ; mW is the mass of the water, in grams ; mc is the mass of the container, in grams ; T0 is ambient temperature, in degrees Celsius ; T1 is the initial temperature of the water, in degree Celsius ; T2 is the final temperature of the water, in degrees Celsius ; t is the heating time, in seconds, excluding the magnetron filament heating-up time. The microwave power output is stated in watts, rounded off to the nearest 50W Heating time for power output: (T2 = T0) 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) P = 4,187 mW (T2 -T1) + 0.55 mC(T2 - T0)/t 70 600 64 650 60 700 56 750 52 800 49 850 47 900 44 950 42 1000 40 1050 38 1100 A (second) B (W)

PROCEDURE 1. Prepare Microwave Energy Survey Meter, 600cc glass beaker, and glass thermometer 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.). 3. Place it at the center of the tray and set it in a cavity. 4. Close the door and operate the oven. 5. Measure the leakage by using Microwave Energy Survey Meter with dual ranges, set to 2450MHz. 1) Measured radiation leakage must not exceed the value prescribed below. Leakage for a fully assembled oven with door normally closed must be less than 4mW/Cm2. 2) When measuring the leakage, always use the 5 cm (2 in.) space cone with probe. Hold the probe perpendicular to the cabinet and door. Place the space cone of the probe on the door, cabinet, door seem, door viewing screen, the exhaust air vents and the suction air vents. 3) Measuring should be in a counter-clockwise direction at a rate of 1 in./sec. If the leakage of the cabinet door seem is unknown, move the probe more slowly. 4) When measuring near a corner of the door, keep the probe perpendicular to the areas making sure the probe end at the base of the cone does not get closer than 2 in. from any metal. If it does not, erroneous reading may result. WARNING 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.

High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle. It is neither necessary nor advisable to attempt measurement of the high voltage. Before touching any oven components or wiring, always unplug the oven from its power source and discharge the capacitor. 1. High voltage transformer 1) Remove connections from the transformer terminals and check continuity. 2) Normal readings should be as follows : Secondary winding ... Approx. 100 10% Filament winding ... Approx. 0 Primary winding ... Approx. 1.2 2. High voltage capacitor 1) Check continuity of capacitor with meter on the highest OHM scale. 2) A normal capacitor will show continuity for a short time, and then indicate 10M once the capacitor charged. 3) A shorted capacitor will show continuous continuity. 4) An open capacitor will show constant 10M . 5) Resistance between each terminal and chassis should be infinite. 3. High voltage diode 1) Isolate the diode from the circuit by disconnecting the leads. 2) With the ohmmeter set on the highest resistance scale measure the resistance across the diode terminals. Reverse the meter leads and again observe the resistance reading. Meter with 6V, 9V or higher voltage batteries should be used to check the front-back resistance of the diode, otherwise an infinite resistance may be read in both directions. A normal diode’s resistance will be infinite in one direction and several hundred k in the other direction. 4. Magnetron For complete magnetron diagnosis, refer to "Measurement of the Microwave Power Output." Continuity checks can only indicate and open filament or a shorted magnetron. To diagnose for an open filament or a shorted magnetron, 1) Isolate magnetron from the circuit by disconnecting the leads. 2) A continuity check across magnetron filament terminals should indicate 0.1 or less. 3) A continuity check between each filament terminal and magnetron case should read open. 5. Fuse If the fuse in the primary and monitor switch circuit is blown when the door is opened, check the primary and monitor switch before replacing the blown fuse. In case the fuse is blown by an improper switch operation, replace the defective switch and fuse at the same time. Replace just the fuse if the switches operate normally.

COOKING MODE MAGNE- UPPER REAR CONVEC- TRON ELEMENT ELEMENT TION FAN M/W G GRILL G COMBI G G G G CONVECTION G G G ROAST PORK G G G G ROAST BEEF G G G G ROAST CHICKEN G G G G BAKED FISH G G G G FRESH VEGETABLES G MANUAL MODE AUTO MODE