MICROWAVE OVEN SERVICE MANUAL
Contents
1. e P uuu u Emm 9 SUN detente teers 10 6 0 Perse 11 6 1 General Information for Service ccccccccceeccceececeeeeceeeeeseeeeceucecseeseeeseaeeesaueeseueessueesaueessueessueeesaeessaneesegs 11 Os IOO hi 12 6 9 Basic Cheek SUMMAT uu uuu u uu aan Exe C u aa ka akan lar parc ne EARS Pneu EUER I ADU 13 o TOUDE Ol u uu EO EE Emm 14 Z Microwave Leakage SI l l lll l iii di stra 25 8 Power Output Measuremernt 27 zz eli ee rc n C M 28 9 1 eu ie duce IMAI S M oes ecec 28 9 2 Interlock Continuity TOSt cccccceccccceeeeeceeeeccceuceeceueeecsaueeseeaeeeseaeeesseaeeeseaseessaeeesageeeseueeessaeeeesaeeessegeeesss 30 10 Component Testing IntormaliOD a i ll il li iii 31 T1 DISASSEMDIY INSUUCTONS LIU a a AASE 35 12 9 0 u uuu e E a a a 43 LGE Internal Use Only 3 Copyright 2010 LG Electronics Inc All right reserved Only for training and service2. L G Website http biz lgservice com MICROWAVE OVEN MODEL LMV1813SW LMV1813SB LMV1813ST CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL February 2010 P NO MFL06272514 Printed in China CAUTION WARNING TO SERVICE TECHNICIANS PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY a Do not operate or allow the oven to be operated with the door open b Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source and make repairs as necessary 1 Interlock operation 2 proper door closing 3 seal and sealing surfaces arcing wear and other damage 4 damage to or loosening of hinges and latches 5 evidence of dropping or abuse c Before turning on microwave power for any service test or inspection within the microwave generating compartments check the magnetron wave guide or transmission line and cavity for proper alignment integrity and connections d Any defective or misadjusted components in the interlock monitor door seal and microwave generation and transmission systems shall be repaired replaced or adjusted by procedures described in this manual before the oven is released to the owner e A Microwave leakage check to verify compliance with the Federal performance standard should be performed on each oven prior to release to the owner Pr
3. Leakage for a fully assembled oven Before the latch switch primary is interrupted with the door in a slightly opened position less than 1 mW cm N Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes 26 NOTE WHEN MEASURING 1 Do not exceed meter full scale deflection 2 The test probe must be removed no faster than 1 inch sec 2 5cm sec along the shaded area otherwise a false reading may result The test probe must be held with the grip portion of the handle A false reading may result if the operator s hand is between the handle and the probe When testing near a corner of the door keep the probe perpendicular to the surface making sure the probe horizontally along the oven surface this may possibly cause probe damage 3 N RECORD KEEPING AND NOTIFICATION AFTER MEASUREMENT 1 After adjustment and repair of any microwave energy interruption or microwave energy blocking device record the measured values for future reference Also enter the information on the service invoice Should the microwave energy leakage not be more than 1 mW cm after determining that all parts are in good condition functioning properly and genuine replacement parts which are listed in this manual have been used At least once a year have the electromagnetic energy leakage monitor checked for calibration by its manufacturer N LGE Internal Use Only 8 POWER
4. Normal Approximately 120 to 135 ohms Abnormal Infinite 33 Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes COMPONENTS TEST RESULTS TOUCH KEY BOARD Measure the resistance between terminal pins of connector KEY CONNECTOR When When NOTE Resistance t0UChed touched When reconnecting the FPC connector value ess than More than make sure that the holes on the FPC 400 ohms 1 megohm connector are properly engaged with hooks on the plastic fastener FPC CONNECTOR MATRIX CIRCUIT FOR TOUCH KEY BOARD CONNECTOR KEY CON NOTES A MICROWAVE ENERGY TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION WHEN REMOVING THE WIRE LEADS FROM THE PARTS BE SURE TO GRASP THE CONNECTOR NOT THE WIRES Copyright 2010 LG Electronics Inc All right reserved 34 LGE Internal Use Only Only for training and service purposes 11 DISASSEMBLY INSTRUC TIONS IMPORTANT NOTES UNIT MUST BE DISCONNECTED FROM ELEC TRICAL OUTLET WHEN MAKING REPAIRS RE PLACEMENTS ADJUSTMENTS AND CONTIN UITY CHECKS WHEN RECONNECTING THE WIRE LEADS TO ANY PART MAKE SURE THE WIRING CONNE CTIONS AND LEAD COLORS ARE CORRECTLY MATCHED ACCORDING TO THE OVERALL CIR CUIT DIAGRAM ESPECIALLY SWITCHES AND HIGH VOLTAGE CIRCUIT A REMOVING POWER AND CONTROL CIRCUIT BOARD Figures 1 2 and 3 1 Re
5. 1 8 Cu ft ACCESSOS Mc Owner s Manual amp Cooking Guide Installation Manual Exhaust Adapter Exhaust Damper Mounting Kit and Filter Rotating Ring Assembly Glass Tray Metal Rack Defrost Plate SWITCH CHART PRIMARY SECONDARY INTERLOCK SWITCH MODE INTERLOCK INTERLOCK MONITOR SWITCH SWITCH SWITCH COM COM COM DOOR OPEN OPEN OPEN CLOSE DOOR CLOSED CLOSE CLOSE OPEN NOTE Use the above switch chart with circuit diagram on page 9 Copyright 2010 LG Electronics Inc All right reserved 4 LGE Internal Use Only Only for training and service purposes 2 CAUTIONS Unlike other 5 microwave oven is high voltage and high current equipment Though it is free from danger in ordinary use extreme care should be taken during repair DO NOT operate on a 2 wire extension cord during repair and use e NEVER TOUCH any oven components or wiring during operation BEFORE TOUCHING any parts of the oven always remove the power plug from the outlet e Remove your watches whenever working close to or replacing the magnetron DO NOT touch any parts of the control panel circuit resulting static electric discharge may damage this P C B NEVER operate the oven with no load e NEVER injure the door seal and front plate of the oven cavity NEVER put iron tools on the magnetron e NEVER put anything into the latch hole and the interlock switches area LGE Internal Use Only
6. 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 connection All input and output microwave connections waveguide flange and gasket must be secure never operate the device without a microwave energy absorbing load attached Never look into an open waveguide or antenna while the device is energized Proper operation of the microwave oven requires that the magnetron be assembled to the waveguide and cavity Never operate the magnetron unless it is properly installed Be sure that the magnetron gasket is properly installed around the dome of the tube whenever installing the magnetron ANTENNA Gasket COOLING FIN FILAMENT TERMINALS MAGNETRON CHASSIS GROUND MAGNETRON THE OVEN IS TO BE SERVICED ONLY BY PROPERLY QUALIFIED SERVICE PERSONNEL 5 Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes 3 INSTALLATION BEFORE YOU BEGIN READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY PRECAUTIONS ON INSTALLATION A Plug the power supply cord into a 120V AC 60Hz single phase power source with a capacity of at least 20 amperes B Avoid placing the unit in a location where there is direct heat or splashing water C Install the unit on the mounting plate firmly D Place the unit as far away as possible from TV radio e
7. 5 mW cm All service adjustments should be made for minimum microwave energy leakage readings Fan Backet Figure 12 LGE Internal Use Only 39 E REMOVING STIRRER FAN Figures 13 and 14 1 Remove one rivet assembly securing it to the oven upper plate by using knife blade 2 Pull out the cover shifting left side 3 Remove one rivet assembly securing it to the oven upper plate by using knife blade 4 Pull out the stirrer fan cover rotating right side 6 Remove the stirrer fan S Li Eim mimimii u _ pr t Figure 13 i 1 Wr Figure 14 Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes F REMOVING DOOR Figure 15 H ASSEMBLING DOOR 1 Remove the vent grille by two screws securing it 1 When mounting the door assembly to the oven to the outcase loosening assembly be sure to adjust the door assembly parallel 2 Lift up and draw the door to the chassis Also adjust so the door has no play between the inner door surface and oven frame NOTES assembly If the door assembly is not mounted i After replacing the door be sure to check that the properly microwaves may leak from the clearance primary interlock switch the secondary interlock
8. OUTPUT MEASUREMENT 1 Microwave power output measurement is made with the microwave oven supplied at its rated voltage and operated at its maximum microwave power setting with a load of 1000 x 5 g of potable water 2 The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 1 8 3 mm and an outside diameter of approximately 7 6 190 mm 3 The oven and the empty vessel are at ambient Temperature TO prior to the start of the test 4 187 Mw T2 1 0 55 2 TO t Is measured while the microwave generator is operating at full power Magnetron filament heat up time is not included about 3 seconds 7 The water is stirred to equalize temperature throughout the vessel prior to measuring the final water temperature 8 Stirring devices and measuring instruments are selected in order to minimize addition or removal 4 of heat 4 The initial temperature T1 of the water is 10 1 C 50 F It is measured immediately Where before the water is added to the vessel After P is the microwave power output in watts addition of the water to the vessel the load is Mw is the mass of the water in grams diately placed on center of the turntable eme EDD n 0 A TO is the ambient temperature in which is in the lowest position and the T1 is the initial temperature of the water in microwave power switched on T2 is the final temperatur
9. Pin 1 to Pin 3 of CN4 Turn on automatically Is the product turn on automatically without pushing the start key 1 Door Open and close more than three times Dose the product operate Alternate with explanation Refer to the Note Adjust the in continuity test between Primary latch the ends of latch board board secondary switch Refer to 9 1 Door should be closed 9 2 if Why Replace the PCB EBR64419603 Is there any beep sound in Replace the continuity test between the PCB ends of two Pin EBR64419603 Pin 1 of CN3 and Pin 5 of Power ON Replace the turntable Motor When door is closed does the oven lamp turn on PCB No Problem Copyright 2010 LG Electronics Inc All right reserved 24 LGE Internal Use Only Only for training and service purposes 7 MICROWAVE LEAKAGE TEST CAUTIONS Be sure to check microwave leakage prior to servicing the oven if the oven is operative prior to servicing The service personnel should inform the manufacturer importer or assembler of any certified oven unit found to have a microwave emission level in excess of 5 mW cm and should repair any unit found to have excessive emission levels at no cost to the owner and should ascertain the cause of the excessive leakage The service personnel should instruct the owner not to use the unit until the oven has been brought into compliance
10. between the doorand The ov r switch and the interlock monitor switch is in good operating normally Space e After replacing the door check for microwave energy popa leakage with a survey meter Microwave energy NN leakage must be below the limit of 5mW cm With a a 275 ml water load REMOVING THE VENTILATION MOTOR 1 Remove the mounting plate by loosening mounting plate screws 1 or 2 screws securing it to the back plate See Figure 17 2 Remove the fan bracket loosening two screw loosening two screw securing the ventilation motor and back plate See Figure 18 a Figure 15 G DISASSEMBLING DOOR Figure 16 1 Remove the dielectric choke by using knife blade or small screw driver etc 2 Remove two screws securing it to the door handle CAUTION Be careful not to damage door seal plate with the screwdriver Fan Bracket Figure 16 Figure 18 a Copyright 2010 LG Electronics Inc All right reserved 40 LGE Internal Use Only Only for training and service purposes 3 Carefully pull the ventilation motor assembly out of the microwave oven See Figure 18 b Figure 18 b LGE Internal Use Only J REMOVING THE TURNTABLE MOTOR 1 Remove the glass tray and rotating ring 2 Remove the turntable shaft VERY CAREFULLY with a hand Figure 19 3 Remove the base plate by removing 8 screws securing it to the oven cavity Fig
11. check the sequence of the switches in steps 5 and 6 LGE Internal Use Only TEST THE LATCH AND SWITCH SEQUENCE 5 Open the oven door slowly Watch the door latch 7 When you achieve the proper sequence of the Secondary Switch Release Rod and Lever switches in Steps 5 and 6 tighten the latch board on the switches to make sure they are zero to the screws at that point body of the switches in the following sequence TEST THE MICROWAVE ENERGY LEAKAGE Primary Interlock Switch Secondary Interlock Switch Make sure the microwave energy leakage is below the Interlock Monitor Switch limit of 1mW cm with a 275 ml water load and 5mW cm with a 275 ml water load without the Adjust the latch board until the switches operate in cabinet when measured with a survey meter this sequence See Steps 3 and 4 6 Close the oven door slowly and be sure it is tightly closed Watch the three switches to make sure they are zero to the body of the switches in the following sequence Interlock Monitor Switch Primary Interlock Switch Secondary Interlock Switch NOTE The Interlock Monitor Switch is an added safety check on the Primary and Secondary Interlock Switches If the Primary and Secondary Interlock Switches allow the oven to operate with the door open the Monitor Switch will blow the fuse LGE Internal Use Only 29 Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes 9 2 Interl
12. is open Switch Symptom 1 is closed No key Not start Operating O L F M S M Check Open Short when the door is closed Switch Symptom 2 Door is open Not turn on O L Check Open Short when the door is open Switch Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes 6 4 Troubleshooting No Display or Dead MICOM CONTROLLER ASSEMBLY CN1 MGT thermostat 8 VR 1 SVC561D 14A mE RY 6 CN2 Q T T MOTOR 3 RELAY RY 1 O 5 CN3 OVEN LAMP S a RELAY RY12 6 C TOPLAMP o HIGH RELAY PK RY 11 5 C TOP LAMP 5S9 G i LOW RELAY RY13 o 5 V FANLAMP 79 14 4 E V FAN HIGH 7 RELAY RY15 6 N VFANTURBO B RELAY RY2 RELAY Q 08 SECONDARY ABSOLUTE INTERLOCK HUMIDITY pk SWITCH SENSOR BL ENEA L BK WH i N B Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes 14 Oven thermostat Fuse Py LGE Internal Use Only Is there any beep sound in Replace the 9 Does the display operate continuity test between the thermostats ends of thermostats Oven Magnetron B Oven Thermostat gn Magnetron Thermostat 5 Is there any sound in Replace the Is there any beep sound in Check PCB continuity test betwee
13. B a lo For Model For Model FOR MODELS LGE Internal Use Only 47 Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes EV LATCH BOARD PARTS 7 KIA T NS LGE Internal Use Only 49 Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes EV INTERIOR PARTS 1 LIT Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes 50 LGE Internal Use Only INTERIOR PARTS II LGE Internal Use Only 51 Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes EV INSTALLATION PARTS COOKING UPPER WALL CMBM5 gt MBM5 GUIDE TEMPLATE TEMPLATE MANUAL LABEL LGE Internal Use Only 52 Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes LG Electronics Inc
14. IGHT HILOW OFF Touch this pad to turn the light on amp CHEESE or CHICKEN NUGGETS high low or off 6 CLOCK Touch this pad to enter the time of day 22 TURNTABLE ON OFF Touch this pad to turn on off the l turntable This option is not available in sensor cook and 7 TIMER Touch this pad to set the kitchen timer detrost modes 8 HOLD WARM Touch this pad to keep hot cooked foods 23 POWER LEVEL Touch this pad to select a cooking power warm in your microwave oven for up to 90 minutes level 9 EZ ON Touch this pad to set and start quickly at 24 VENT Touch this pad to turn the fan on high 100 power level low or off Te COO TME Jogos oor 25 VENT TURBO Touch this pad to choose the most powerful 11 CUSTOM SET Touch this pad to change the oven s default fan speed setting for sound clock disply speed and defrost weight 26 VENT AUTO TIME SET Touch this pad when setting 12 CUSTOM COOK Touch this pad to recall one cooking ventilation time 1 3 5 10 and 30 minutes instruction previously programmed into memory 13 DEFROST Touch this key to defrost food by entering weight cook time or Quickly Touch this key 2 times to Quick Defrost Cook Touch this key 3 times to Time Defrost Cook Copyright 2010 LG Electronics Inc All right reserved 8 LGE Internal Use Only Only for training and service purposes 5 WIRING DIAGRAM KEY MATRIX 5 1 Wiring Diagra
15. N A TEST PROCEDURES COMPONENTS TEST RESULTS TRANSFORMER FILAMENT SECONDARY WINDING WINDING 1 Remove wire leads 2 Measure resistance ohm meter scale Rx1 Primary winding Approx 0 2 to 0 5 ohms e Secondary winding Approx 50 to 120 ohms Filament winding 0 ohm 3 Measure resistance ohm meter scale Rx1000 Primary winding to ground Normal Infinite Filament winding to ground Normal Infinite MAGNETRON Antenna Gasket Chassis Filament 1 Remove wire leads Install the magnetron seal in the correct position Check that the seal is in good condition 2 Measure resistance ohm meter scale Rx1 Normal Less than 1 ohm e Filament terminal 3 Measure resistance ohm meter scale Rx1000 Normal Infinite e Filament to chassis LGE Internal Use Only 31 Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes COMPONENTS TEST RESULTS 1 Remove wire leads SESS SOUS 2 Measure resistance ohm meter scale Rx1000 Terminal to terminal Normal Momently indicates x several ohm and then gradually returns to infinite Terminal to case Normal Infinite aa i Measure continuity Forward Normal Continuity ohm meter scale Rx1000 Abnormal Infinite DIODE Some inexpensive ohm meters may indicate infinite resistance in both directions CA Measure continuity Reverse Normal Infinite
16. OFF STOP CLEAR EZ ON ADD30SEC 10 HOT DOG CHICKEN NUGGETS LGE Internal Use Only 6 TROUBLESHOOTING 6 1 General Information for Service GENERAL PRECAUTIONS IN USE A Never operate the unit when it is empty Operating the oven with no load may shorten the life of the magnetron Whenever cooking dry foods dried fish bread etc or a small amount of food be sure to put a glass of water into the cooking compartment The glass turntable may become hot after operating be careful when touching it B Aluminum foil should be avoided because it will disrupt cooking and may cause arcing However small pieces may be used to cover some parts of food to slow the cooking Any aluminum foil used should never be closer than 2 5 cm to any side wall of the oven TRIAL OPERATION After installation the following sequences and results should be checked carefully A Put a container filled with water about 1 liter into the oven and close the door tightly B Set cooking time for 10 minutes C Press the START pad to start Make sure the cavity light comes on The unit will begin cooking and the display window will show the time counting down by seconds D After about 5 minutes make sure the primary interlock switch the secondary interlock switch and the interlock monitor switch operate properly by opening and closing the door several times Press the Press the START pad each time the door is closed E Co
17. TCH SENSOR a Lj BK WH NECK MAGNETRON B HV DIODE LGE Internal Use Only 19 Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes 3 Is the connector connected to Reconnect or Power and MAIN PCB Yes repair assembly disconnected or the connector disassembled CN6 CN7 After power on does the product operate Alternate with explanation 1 Repeat door open and close more than three times Does product operate Refer to the Note PCB No Problem 2 Is there any sound in continuity test between TAB1 and TAB2 EZ On B Replace the EBR64419603 Note something is caught in the door or in the sealing area the microwave oven cannot operate safely The latch switches and monitor switch will prevent operation Copyright 2010 LG Electronics Inc All right reserved 20 LGE Internal Use Only Only for training and service purposes power Is the resistance of high Replace the 5 Is there any beep sound Adjust latch voltage Transformer out of High Voltage in continuity test between board rage Transformer the ends of latch board Refer to 9 1 primary switch 9 2 Door should be closed Test Point 1 Primary winding High Low 0 2 0 5 Ohm 6 Is the connector connected Yes Reconnect or to High voltage Transformer repair the assembly disconnected or connector disasse
18. age monitor to 2450 MHz and use it following the manufacturer s recommended test procedure to assure correct result When measuring the leakage always use 2 inch bcm spacer supplied with the probe Operate the oven at its maximum output Measure the microwave radiation using and electromagnetic radiation monitor by holding the probe perpendicular to the surface being measured Move probe along shaded area Probe scanning speed Less than 2 5 cm sec 1 in sec 2 Z Z Z Z Z Z Z LLA RTA A ARES AY x NON NON NSS Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes MEASUREMENT WITH THE OUTER CASE REMOVED 1 When you replace the magnetron measure for microwave energy leakage before the outer case is installed and after all necessary components are replaced or adjusted Special care should be taken in measuring the following parts Around the magnetron The waveguide WARNING AVOID CONTACTING ANY HIGH VOLTAGE PARTS MEASUREMENT WITH A FULLY ASSEMBLED OVEN 1 After all components including the outer panels are fully assembled measure for microwave energy leakage around the door viewing window the exhaust opening and air inlet openings Microwave energy leakage must not exceed the values prescribed below NOTES Leakage with the outer panels removed than 5 mW cm
19. d circuit in the door open condition When the door is closed meter should indicate an open circuit When the monitor switch operation is abnormal replace with the same type of switch NOTE After repairing the door or the interlock system it is necessary to do this continuity test before operating the oven COMPONENTS TEST PROCEDURE RESULTS SWITCHES Check for continuity of the Door Wire leads removed switch with an Ohm meter Primary Switch Monitor Switch Secondary Switch NOTE After checking for the continuity of switches make sure that they are connected correctly WARNING FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS TYPE NO SZM V16 FA 63 OR VP 533A OF OR V 5230Q FOR PRIMARY SWITCH TYPE NO SZM V16 FA 62 OR VP 532A OF OR V 5220Q FOR MONITOR SWITCH TYPE NO SZM V16 FA 63 OR VP 533A OF OR V 5230Q FOR SECONDARY SWITCH Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 10 COMPONENT TESTING INFORMATION CAUTIONS 1 DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASE FROM THE UNIT PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE LEAD WIRES FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER 2 ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD 1 LITER OF WATER IN CONTAINER IN THE OVE
20. e f the oven operates with the door open the service personnel should Tell the user not to operate the oven Contact the manufacturer and CDRH Center for Devices and Radiological Health immediately NOTE Address on CDRH Office of Compliance HFZ 312 Center for Devices and Radiological Health 1390 Piccard Drive Rockville Maryland 20850 The service personnel should check all surface and vent openings for microwave emission testing e Check for microwave energy leakage after every servicing The power density of the microwave radiation leakage emitted by the microwave oven should not exceed 1mW cm sq And always start measuring of an unknown field to assure safety for operating personnel from radiation leakage NOTE The standard is 5mW cm sq while in the customer s home 1mW cm sq stated here is manufacturer s own voluntary standard for units in customer s home LGE Internal Use Only EQUIPMENT TESTER VOLTS DC AC Ohmmeter e Microwave survey meter Holaday 1500 1501 Narda 8100 8200 e 600 cc non conductive material beaker glass plastic inside diameter approx 8 5 cm 2 in Glass thermometer 100 C or 212 F 1 deg scale MEASURING MICROWAVE ENERGY LEAKAGE Pour 275 15cc of 20 5 C 68 9 F water in a beaker which is graduated to 600 cc and place the beaker on the oven e Set the energy leak
21. e of the water in tis the heating time in seconds excluding the magnetron filament heat up time b The time t for the temperature of the water to rise by a value T of 10 1 is measured where t is the time in seconds and T is the temperature rise The initial and final water WATER LOAD temperatures are selected so that the maximum difference between the final water temperature and the ambient temperature is 5 K 6 The microwave power output P in watts is calculated from the following formula GLASS TRAY LGE Internal Use Only 27 Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes 9 INTERLOC K SYSTEM 9 1 Interlock Mechanism The door lock mechanism is a device which has been specially designed to eliminate completely microwave activity when the door is opened during cooking and thus to prevent the danger resulting from the microwave leakage ADJUSTMENT PROCEDURES To avoid possible exposure to microwave energy leakage adjust the door latches and interlock switches using the following procedure The Interlock Monitor and Primary Interlock Switch act as the final safety switch protecting the user from microwave energy The terminals between COM and NC of the Interlock Monitor must close when the door is opened After adjusting the Interlock Monitor Switch make sure that it is correctly connected Mounting of the primary monitor secondary switches to the
22. in 1 to Pin 3 of CN4 to MAIN PCB assembly disconnected or disassembled CN3 111111 MI LATA n TAAR s ODORE 1 1 t po 11 1 A T i q lpp ii i da t 5 Replace the EBR64419603 Replace the Keypad if changing the PCB Doesn t resolve the problem Replace the PCB EBR64419603 Reconnect or repair the connector LGE Internal Use Only No Heat No Cook Ned AC 120V 60Hz SINGLE PHASE ONLY NOISE FILTER ASSEMBLY WH MICOM CONTROLLER ASSEMBLY FUSE a i SR5 BL rot i VR1 DUER I SVC561D 14A a THERMOSTAT ae 145 0 PRESE B 293 F 32 F l f 5 I 7 I RY6 l4 CN2 T MOTOR 198 9 E RELAY I EUN 3 MGT 15000 iz 302 F 32 F m a 1 RY1 PRIMARY OVEN LAMP 23 5 I das INTERLOCK RELAY 197 8 41 SWITCH T RY12 T C TOP LANP ON HIGH RELAY cH E T ecu RY 11 af C TOP LAMP LOW RELAY 7 J I RY13 Tt V FAN LAMP E RELAY Lo Bh s ASF O V FAN HIGH oN RELAY L T H7 w E V FAN TURBO oN RELAY L ___ SSE SSES INTERLOCK MONITOR MGT SWITCH RELAY 6 SECONDARY ORAE INTERLOCK HUMIDITY pk SWI
23. ing and features vary by model 14 SOFTEN Touch this pad to soften Butter Ice Cream 1 DISPLAY The Display includes a clock and indicators to tell Cream Cheese and Frozen Juice you time of day cooking time setting and cooking functions 15 MELT Touch this pad to melt Butter Margarine selected Chocolate Cheese and Marshmallows 2 REHEAT Touch this pad to reheat Pizza Slice Dinner 16 NUMBER Touch number pads to enter cooking time Plate Soup Sauce and Casserole The oven s sensor will power level quantities or weights tell the oven how long to cook depending on the amount of MN 17 START ENTER Touch this pad to start a function If you humidity coming from the food open the door after oven begins to cook touch 3 COOK Touch this pad to cook Baked Potato Vegetable START ENTER again Casserole Rice and Frozen Entree The oven s sensor will tell the oven how long to cook depending on the amount of humidity coming from the food 18 STOP CLEAR Touch this pad to stop the oven or to clear all entries 19 LESS Touch this pad to subtract ten seconds of cooking 4 POPCORN Touch this pad when popping popcorn in your time each time you press it microwave oven The oven s sensor will tell the oven how long to cook depending on the amount of humidity it detects 20 MORE Touch this pad to add ten seconds of cooking time from the popcorn each time you press it 5 KIDS MEAL Select type of dish to reheat HOT DOG MAC 21 L
24. latch board Latch Board Primar Interlock Switch Interlock Monitor Switch Secondary Interlock Switch D Figure 23 a LATCH 0 1 64 LATCH BOARD Figure 23 b 0 1 64 Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes 28 CHECK THE DOOR LATCH AND SWITCH CLOSING NOTE The outer cover of the microwave oven is removed 1 Set the microwave oven on its side so that you can see the latch board and the switches as shown inFigure 23 a 2 Close the door tightly and check gaps A and B to be sure they are no more than 1 64 0 5 mm See Figure 23 b for close up view of gaps and B door latches If all gaps are less than 1 64 0 5 adjustment of the latch board may not be necessary Go to Steps 5 and 6 to check the sequence of the switches NOTE To correct sequence of the Primary Interlock Switch Secondary Interlock Switch and the Interlock Monitor Switch is very important If any gap is larger than 1 64 0 5 mm you will need to adjust the latch board Go to step 3 and follow all steps in order ADJUST THE LATCH AND SWITCH CLOSING 3 Loosen the two screws holding the plastic latch board as shown 4 With the oven door closed tightly move the latch board upward toward the top of the oven and or away from the door latch until the gaps are less than 1 64 0 5 mm Hold the latch board tightly in this position until you
25. m MICOM CONTROLLER ASSEMBLY VR 1 SVC561D 14A RY6 T MOTOR RELAY RY1 OVEN LAMP RELAY RY 12 C TOP LAMP HIGH RELAY 11 C TOP LAMP LOW RELAY r RY 13 V FAN LAMP RELAY r RY 14 V FAN HIGH RELAY r RY 15 V FAN TURBO RELAY RY2 RELAY ABSOLUTE HUMIDITY SENSOR CN6 1 2 Es an N g CS LGE Internal Use Only AC 120V 60Hz SINGLE PHASE ONLY NOISE FILTER ASSEMBLY OVEN THERMOSTAT 145 C 0 C Q 293 F 32 F BK MGT THERMOSTAT 150 C 0 C 302 F 32 F BK PRIMARY INTERLOCK ON SWITCH BK p 4 r 4 p 4 p loo oo goo 0 1 0 00 I IPPT TOET bee d x C I Ge 4 BR F INTERLOCK MONITOR SWITCH SECONDARY INTERLOCK E pk SWITCH 3 O MAGNETRON H V DIODE Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes 5 2 Key Matrix CUSTOM TIME SET COOK VENT Hi Low OFF Vent On Off TURBO Vent Speed SENSOR SENSOR POPCORN COOK LEVEL LIGHT SENSOR REHEAT Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes WARMING Hold Warm MAC amp CHEESE DEFROST Auto Defrost KEY MATRIX T T ABLE ON
26. mbled LGE Internal Use Only 21 Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes 8 Is the connector connected Reconnect or 11 Is the resistance of the high Replace the to High Voltage capacitor repair the voltage diode out of rage high voltage assembly disconnected or connector Refer to 10 Diode disassembled Replace the 12 Is the connector connected voltage capacitor out of high voltage to magnetron assembly rage capacitor disconnected or Refer to 10 disassembled Test Point Is the connector connected Reconnect or Reconnect or repair the to the high voltage diode repair the connector assembly disconnected or connector disassembled Copyright 2010 LG Electronics Inc All right reserved 22 LGE Internal Use Only Only for training and service purposes 4 Push the EZ ON Operate Replace the Is the voltage of both ends PCB of the D30 over 8 V EBR64419603 Turntable Motor Does Not Work Power ON 1p oes the turntable motor operate 2 Does Fan Motor on when the EZ On button is pressed 3 When door is closed does Adjust the the oven lamp turn on Primary latch board Refer to 9 1 9 2 LGE Internal Use Only 23 Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes 4 When the door is opened Is Ng Replace the the voltage of door sensing PCB part over 4V EBR64419603
27. move a screw securing the control panel assembly to the oven cavity 2 Remove the control panel with pushing it upward 3 Remove the connectors CN1 CN2 CN6 and wire leads RY2 from the circuit board Control Panel Circuit Board 1 L 1 Power Transformer CN3 CN2 Figure 1 LGE Internal Use Only 4 Remove 6 screws securing the circuit board Circuit Board Figure 2 b Remove the FPC connector from the terminal socket following HOW TO REMOVE THE FPC CONNECTOR on the next page 6 Remove the circuit board from the control bracket carefully Circuit Board Figure 3 35 Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes HOW TO REMOVE THE F P C CONNECTOR HOW TO INSERT THE F P C CONNECTOR Follow the steps below as illustrated in Figures 4 Follow the steps below as illustrated in Figures 6 and 5 to remove the F P C connector and 7 to insert the F P C connector 1 Insert the F P C connector into the terminal 1 Hold the edges of the plastic fastener with socket securely with the fingers thumb and forefinger 2 Hold the plastic fastener with thumb and Figure 4 forefinger of the other hand and push it 2 Lift up the lever of the plastic fastener from slowly into the terminal socket Figure 6 the terminal
28. n the Fuse continuity test between the Go to No 8 of ends of the Fuse power code and connector this flow chart Code L to Pin3 Code N to Pin5 LGE Internal Use Only 15 Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes Is there any beep sound in continuity test between the repair the ends of noise filter connector of Live terminal Noise filter Neutral terminal of Noise filter Replace the Main PCB EBR64419603 Copyright 2010 LG Electronics Inc All right reserved 16 LGE Internal Use Only Only for training and service purposes Keypad Failure MICOM CONTROLLER ASSEMBLY SECONDARY INTERLOCK SWITCH e Start key or EZ ON key works if the door is closed LGE Internal Use Only 17 Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes Does keys operate Power ON 1 Do not only START key and EZ ON key operate Door should be closed 2 Is there sound in continuity test between the ends of latch board Secondary Switch Door should be closed Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes Adjust latch Check PWB Go to No 5 of this flow chart board Refer 9 1 9 2 18 3 When the door is opened Is the voltage of door sensing part over 4V P
29. ntinue operating the unit For long beep sound signal is heard when the time is up The unit will shut off automatically F Confirm the water is hot G Finally measure the output power according to POWER OUTPUT MEASUREMENT on page 8 LGE Internal Use Only 11 FEATURES AND SPECIFICATIONS FEATURES A The safety systems incorporated in this model are Choke system Oven cavity thermostat Note This thermostat located on the oven cavity will open and stop the unit from operation only if a high temperature is reached such as a fire created by overcooking food B Any one of 10 power output levels ranging O W to 1 100 W can be selected by the touch control and electronic computer system Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes 6 2 Safety Caution A SINCE NEARLY 4 000 VOLTS EXISTS IN SOME CIRCUITS OF THIS UNIT REPAIRS SHOULD BECARRIED OUT WITH GREAT CARE The filament leads of magnetron carry High Voltage with respect to ground Extreme caution must be exercised Never plug the unit into a power source to determine which component is defective in high voltage section B TO AVOID POSSIBLE EXPOSURE TO MICROWAVE ENERGY LEAKAGE THE FOLLOWING PRECAUTIONS MUST BE TAKEN BEFORE SERVICING 1 Before the power is applied a Make sure the primary interlock switch the secondary interlock switch and the interlock monitor switch operate properly by o
30. ock Continuity Test A PRIMARY INTERLOCK SWITCH TEST When the door is opened slowly an audible click should be heard at the same time or successively at intervals and the latches should activate the switches with an audible click If the latches do not activate the switches when the door is closed the switches should be a adjusted in accordance with the adjustment procedure Disconnect the wire lead from the primary switch Connect the ohmmeter leads to the common COM and normally open NO terminal of the switch The meter should indicate an open circuit in the door open condition When the door is closed the meter should indicate a closed circuit When the primary switch operation is abnormal make the necessary adjustment or replace the switch only with the same type of switch B S ECONDARY INTERLOCK SWITCH TEST Disconnect the wire lead from the secondary switch Connect the ohmmeter leads to the common COM and normally open NO terminals of the switch The meter should indicate a open circuit in the door open condition When the door is closed meter should indicate an closed circuit When the secondary switch operation is abnormal make the necessary adjustment or replace the switch only with the same type of switch C MONITOR SWITCH TEST Disconnect the wire lead from the monitor switch Connect the ohmmeter leads to the common COM and normally closed NC terminals of the switch The meter should indicate close
31. oper operation of the microwave ovens requires that the magnetron be assembled to the wave guide and cavity Never operate the magnetron unless it is properly installed Be sure that the magnetron gasket is properly installed around the dome of the tube whenever installing the magnetron e Routine service safety procedures should be exercised at all times Untrained personnel should not attempt service without a thorough review of the test procedures and safety information contained in this manual Copyright 2010 LG Electronics Inc All right reserved 2 LGE Internal Use Only Only for training and service purposes FOREWORD Read this Manual carefully Failure to adhere to or observe the information in this Manual may result in exposing yourself to the Microwave Energy normally contained within the oven cavity CONTENTS Page ES CAN NS E 2 SC CNC QUQ mr 4 p ario PR 5 5 MI 6 As 7 4 1 Control Panel 7 4 2 Explanation of Control 8 5 Wining Diagram Bu c 9
32. pening and closing the door several by opening and closing the door several times Make sure the perforated screen and the dielectric choke of the door are correctly and firmly mounted o 2 After power is applied a Make sure the interlock switch mechanism Is operating properly by opening and closing the door b Check microwave energy leakage must be below the limit of 5 mW cm All service adjustments should be made for minimum microwave energy leakage readings Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes 12 3 Do not operate the unit until it is completely repaired if any of the following conditions exist The unit must not be operated a The door does not close firmly b The hinge is broken The door seal is damaged d The door is bent or warped or there is any other visible damage on the unit that may cause microwave energy leakage NOTE Always keep the seal clean e Make sure that there are no defective parts in the interlock mechanism Make sure that there are no detective parts in the microwave generating and transmission assembly especially waveguide 4 The following items should be checked after the unit is repaired a The interlock monitor switch is connected correctly and firmly b The magnetron gasket is properly positioned and mounted c The waveguide and the oven cavity are in
33. purposes 1 SPECIHCATIONS Rated Power Consumption 1815W maximum Microwave oven Cook top lamps Ventilation fan Microwave Output 1100W IEC60705 Fi Ik i y au Y 2450 MHz 50 MHz Power Supply 120 VAC 60 Hz Rated 14 Amp Microwave oven Cook top lamps Ventilation fan Magnetron Cooling Forced Air Cooling asse Rectification Voltage Double Half Wave Door Sealing Choke System DOVICES Magnetron Thermostat Open at 150 5 Close 0 5 Oven Thermostat Open at 145 5 Close at 0 5 Fuse 20 Primary Interlock Switch Secondary Interlock Switch Interlock Monitor Switch MM 2 246 LG Cook top Lamp 125V 30W Incandescent Warming Lamp uuu uu ua aei RU 125V 30W nuc sss sss Digital up to 99 min in each cooking stage Ji Tempered Safety Glass Overall Dimensions 2915 16 W x 167 16 H x 155 s D Oven Cavity SIZ 216 8 x 105 s H x 145 s D Effective Capacity of Oven Cavity
34. roller Figure 8 LGE Internal Use Only 37 Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes C REMOVING THE DOOR INTERLOCK SWITCHES Figures 9 10 1 Disconnect the wire leads from the interlock switches 2 Remove two screws securing the Latch Board 3 Make necessary replacements and check microwave energy leakage according to ADJUSTMENT PROCEDURES on page 28 Latch Board Latch Board Primary Interlock Switch Interlock Monitor Switch Secondary Interlock Switch Figure 10 WIRE COLOR YMBOL COLO Not Provided Copyright 2010 LG Electronics Inc All right reserved 38 LGE Internal Use Only Only for training and service purposes D REMOVING MAGNETRON Figures 11 Through 12 1 Remove the vent grille by loosening two screws Figure 11 2 Remove the outcase See page 7 6 3 Remove four tap tite screws securing magnetron to the wave guide 4 Remove the magnetron VERY CAREFULLY NOTES When removing the magnetron make sure that its dome does not hit any adjacent parts or it may be damaged When replacing the magnetron be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition e After replacing the magnetron check for microwave energy leakage with a survey meter Check microwave energy leakage must be below the limit of
35. s Y ohm meter scale Rx1000 Abnormal Continuity Z 9 RELAY 2 1 Measure continuity Power ohm meter scale Rx1 Level Open 2 Remove the lead wires and operate oven at power level 1 through power level 10 FAN MOTOR 1 Remove wire leads Normal Approximately Terminal 35 to 50 ohms Terminal 5 to 15 ohms 2 Measure resistance Abnormal ohm meter scale Rx1 Infinite or several L Copyright 2010 LG Electronics Inc All right reserved 32 LGE Internal Use Only Only for training and service purposes o O OQ Q S COMPONENTS TEST RESULTS VENTILATION MOTOR TURNTABLE MOTOR ABSOLUTE HUMIDITY SENSOR STIRRER MOTOR LGE Internal Use Only 1 Remove lead wires 2 Measure resistance ohm meter scale Rx1 Turbo speed blue amp black wire High speed blue amp white wire Low speed blue amp gray wire 1 Remove wire leads 2 Measure resistance ohm meter scale Rx1000 1 Disconnect sensor connector from micom computer board 2 Measure resistance terminal to terminal ohm meter scale R X 1000 1 Remove lead wires 2 Measure resistance ohm meter scale Rx1000 Normal Approximately Turbo speed 20 to 30 ohms High speed 40 to 50 ohms Low speed 45 to 55 ohms Normal Approximately 2 0 to 3 0 Kohms Abnormal Infinite or several Normal Approximately BK RD 6 0 Kohms RD WH 3 0 Kohms BK WH 3 0 Kohms Abnormal Infinite or approx 0 ohm
36. socket by lightly pressing the NOTE When reconnecting the F P C lever end with forefinger connector make sure that the holes Figure 5 on the F P C connector are properly 3 Remove the F P C connector from the engaged with the hooks on the plastic terminal socket fastener Lock the level of the plastic fastener into the hook of the terminal socket securely by releasing the fingers Plastic fastener Figure 7 Plastic fastener jy Connector Terminal Socket Connector Figure 4 Terminal Socket Figure 6 Plastic fastener Plastic fastener C 4 Connector Terminal Connector Socket Figure 5 Terminal socket Figure 7 Copyright 2010 LG Electronics Inc All right reserved 36 LGE Internal Use Only Only for training and service purposes B REMOVING THE OUT CASE Figure 8 1 Remove the vent grille by removing two screws securing it to the outer case 2 Remove two screws securing it to the air duct 3 Remove the mounting plate by turning the screws 1 or 2 screws securing it to the outer case 4 Remove two screws on the left central edge and two screws on the right central edge of the base plate Remove the fan bracket from the outer case by removing one screw securing it to the outer case b Remove four screws of the rear cavity Remove the outcase with disconnecting power cord connector I Vent Grille RN Cont
37. tact no microwave energy leakage d The door can be properly closed and the safety switches work properly e The unit must stop when the door is opened or the time is up The unit must not be operated with any of the above components removed or bypassed LGE Internal Use Only 6 3 Basic Check Summary MICOM CONTROLLER ASSEMBLY VR 1 SVC561D 14A RY6 T T MOTOR RELAY RY 1 OVEN LAMP RELAY r RY 12 C TOP LAMP HIGH RELAY r RY 11 C TOP LAMP LOW RELAY r RY 13 V FAN LAMP RELAY r RY 14 V FAN HIGH RELAY r RY 15 V FAN TURBO RELAY ABSOLUTE HUMIDITY SENSOR CN6 BK WH i B E N CO N LGE Internal Use Only 120 V Ac 120V Ac BK L BK CN1 3 WH N WH CN1 5 AC 120V 60Hz SINGLE PHASE ONLY CT NOISE FILTER ASSEMBLY 2st t MGT THERMOSTAT 150 C 0 C 302 F 32 F PRIMARY INTERLOCK SWITCH INTERLOCK MONITOR SWITCH C SECONDARY INTERLOCK SWITCH MAGNETRON H V DIODE E Symptom Dead Check Open Short Symptom Dead Check Open Short It is normally recovered if the set is cooled down Symptom Dead Check Open Short Symptom 1 is closed No cook Operate F M S M T T M automatically Check Open Short when the door is closed Switch Symptom 2 Door is open Not operate F M S M T T M Check Open Short when the door
38. tc to prevent interference GROUNDING INSTRUCTIONS For personal safety this appliance must be fully grounded at all times In the event of an electrical short circuit grounding reduces the risk of electrical shock The plug must be plugged into an outlet that is properly installed and grounded CAUTION This unit is equipped with a 3 prong plug for your safety If the wall outlet is a grounded 3 hole the unit will be grounded automatically Plug with Ground Properly Polarized and Grounded Outlet WARNING Improper use of the grounding plug can result in a risk of electric shock Do not under any circumstances cut or remove the third ground prong from the power cord plug Copyright 2010 LG Electronics Inc All right reserved 6 LGE Internal Use Only Only for training and service purposes 4 Control Panel Features SENSOR TOUCH REHEAT COOK POPCORN S KIDS MEAL MAC amp CHICKEN CHEESE NUGGETS ee CLOCK TIMER HOLD WARM EZ ON OW OG COOK CUSTOM CUSTOM TIME SET COOK DEFROST SOFTEN MELT 1 2 3 47 ENTER 4 5 6 7 8 3 STOP _ 0 CLEAR 18 19 LESS MORE LIGHT TURNTABLE POWER 23 21 LOW OFF ON OFF LEVEL 22 AUTO HI LOW OFF TURBO J 26 LGE Internal Use Only 7 Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes 4 2 Explanation of Control Panel NOTE Styl
39. ure 20 4 Disconnect the leadwire from the turntable motor terminals b Remove the 2 screw securing the turntable motor to the oven cavity assembly Figure 21 NOTES e Remove the leadwire from the turntable motor VERY CAREFULLY Be sure to grasp the connector not the wires when removing Figure 19 Wire Leads Turntable Motor Figure 21 Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes REPLACING THE HUMIDITY SENSOR 1 Remove the sensor by removing two screws in front of the lamp cover amp removing one screw securing it to the air duct See Figure 22 2 Mount the new humidity sensor to the air duct Figure 22 Copyright 2010 LG Electronics Inc All right reserved 42 LGE Internal Use Only Only for training and service purposes EV 12 EXPLODED VIEW DOOR PARTS 1 FOR MODELS LMV1813SW LMV1813SB Copyright 2010 LG Electronics Inc All right reserved 43 LGE Internal Use Only Only for training and service purposes EV CONTROLLER PARTS FOR MODELS LMV1813SW LMV1813SB Copyright 2010 LG Electronics Inc All right reserved 45 LGE Internal Use Only Only for training and service purposes CAVITY PARTS LMV1813SW LMV1813SB LMV1813SW LMV1813S
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