LIGHT OVEN “SolarDOM” SERVICE MANUAL
Contents
1. CONDITION CHECK RESULT CAUSE REMEDY Output is low gt Check the Lower than 90 of amp Decrease in power Suggest customer power source rating voltage source voltage contact local voltage with load electric power L Normal utility qualified electrician Disconnect the gt wire leads from Abnormal Defective P C B Replace P C B C C relay 7 and check assembly assembly on and off time with multitester gt Normal Measure the Abnormal Defective Replace output power magnetron magnetron NOTE Simple test of power output conducted by heating one liter water for one min if available Minimum 8 5 C temperature rise is normal condition Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 5 18 LGE Internal Use Only TROUBLE 5 microwave oscillation even though oven lamp and fan motor run Display operates properly CONDITION CHECK RESULT CAUSE REMEDY 4 gt Disconnect the Nocontinuity gt 21 DEP 2 POB wire leads from y relay 7 and check continuity gt Continuity of relay 7 Operate2. 18 78 Ng 1no 1no 1no no m TIVINH3HLL um 00 2 je 5 Joyoedeo i NH F 2 s nx j i8 3 n4NH E g 1 ADA 9 5 8 Hari T 5 ec dj asa 5 7 A H gt B 06 m N8 Na WVYSVIC Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 4 3 LGE Internal Use Only CIRCUIT DESCRIPTION GENERAL DETAILS The low voltage transformer supplies the necessary voltage to the micom controller when power cord is plugged in When the door is closed the primary switch is ON the secondary switch is ON and the monitor switch opens contact COM and NO WHEN SELECTING COOKING POWER LEVEL AND TIME The micom controller memorizes the function you set The time you set appears in the display window Each indicator light turns on to indicate that the stage has been set WHEN TOUCHING THE START BUTTON The coil of the relay is energized by the micom controller Power input is supplied to the high voltage transformer through the fuse to the primary switch and relay 4 Turntable rotates PRIMARY FUSE SW
3. 2 Colon does not turn on or blink 3 A distinct change in the brightness of one or more numbers in display 4 One or more digits in the display are not lighting 5 Display does not count down with time blinking or up with clock operation 6 Display obviously jumps in time while counting down 7 Display counts down too fast while cooking 8 Each indicator light does not turn on after setting cooking cycle 9 Display time of day does not reappear when cooking is finished 10 Beep sound is not heard when correct key is touched CONDITION CHECK RESULT CAUSE REMEDY 1 No input can be Check the conn Continuity Defective PCB Replace PCB programmed ection between assembly assembly key assembly and PCB Connect them assembly connection tightly 2 Some inputs Everything works Defective k cannot bg Replace key as specified L Defective key eplace key assembly and assembly assembly programmed 3 Display showsa Defective Still have trouble gt assembly assembly different from one touched 4 Random programming when touching other pads Display is fixed at some figure and can not accept any input Copyright O 2007 LG Electronics Inc All right reserved Only for training and service purposes 5 16 LGE Internal Use Only TROUBLE 2 O
4. 1 SETTING THE CLOCK zr amp dq Oo 4 od b gt gt 2 MICROWAVE COOKING 7 DEFROST gt gt tl gt a gt D o FP A 8 AUTO 3 GRILL COOKING gt o pL m D 9 5 4 m gt a gt r amp gt D gt 10 CHILD LOCK This oven has a CHILD LOCK feature To Set CHILD LOCK o He HEHE er S gt gt xD gt gt To Cancel CHILD LOCK 5 CONVECTION COOKING gt amp o 6 GRILL COMBI COOKING F gt m 11 Copyright 2007 LG Electronics Inc All right reserved 4 2 LGE
5. MEASUREMENT WITH A FULLY ASSEMBLED OVEN After all components including the outer case 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 NOTE Leakage with the outer case removed less than 5 mW cm sq Leakage for a fully assembled oven Before the latch switch primary is interrupted with the door in a slightly opened position less than 2 mW cm sq Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 5 2 NOTES WHEN MEASURING Do not exceed meter full scale deflection The test probe must be removed no faster than 1 inch sec 2 5 cm 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 RECORD KEEPING AND NOTIFICATION AFTER MEASUREMENT 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 The microwave energy l
6. them at the same time causes overloading The oven plug is not inserted tightly Low AC input voltage Food temperature is too low the oven Insert the oven plug securely Use the oven at adequate line voltage This may not be a defect It is possible that the food should be cooked for a longer time period Sparks occurring Using metallic ware and allowing it to touch the oven wall Uneven cooking LGE Internal Use Only Do not use metallic ware for cooking except where noted in the cooking guide Ceramic ware trimmed in gold or silver powder is used Do not use any type of cookware with metallic trimming Inconsistent intensity of microwave by their characteristics 1 Wrap the thinner part with aluminum foil 2 Use plastic wrap or lid 3 Stir once or twice while cooking soup cocoa or milk etc Copyright O 2007 LG Electronics Inc All right reserved Only for training and service purposes TROUBLE 1 The following visual conditions indicate probable defective control circuit 1 Incomplete segments Segment missing Partial segment missing Digit flickering NOTE Slight flickering is normal
7. Website http biz lgservice com LG LIGHT OVEN SolarDOM MODEL MP 3297IXC CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL Juary 2007 P NO MFL34215507 Printed in Korea EV EXPLODED VIEW INTRODUCTION MODEL 32971 OVEN CAVITY PARTS 5 4 7 Wh BASE PLATE PARTS INTERIOR PARTS CONTROL PANEL PARTS LATCH BOARD PARTS DOOR PARTS Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 6 1 LGE Internal Use Only EV DOOR PARTS LGE Internal Use Only 2 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes EV CONTROL PANEL PARTS LGE Internal Use Only 6 3 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes EV OVEN CAVITY PARTS 4 gt aw M 2 22 222 gt gt Qu 222 5 gt b SOS OSG 948501 Copyright 2007 LG Electronics Inc All right reserved 6 4 LGE Internal Use Only Only for training and service purposes EV LATCH BOARD PARTS Copyright 2007 LG Electronics Inc All right reserved Only
8. Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 5 20 LGE Internal Use Only
9. relay 4 5 6 thermostat and Replace relay 4 5 6 Normal Wire connection gt No continuity Open or loosen gt b dnd connect tightly 2 Lower tempera Malfunction of the Heater Abnormal Lr Replace ture the oven heater Normal Thermostat and gt Abnormal Malfunction of the Replace relay 4 5 6 NOTE Make sure the wire leads correct position When removing the wire leads from parts Be sure to grasp the connector not the wires When removing the magnetron be sure to install the magnetron gasket in the correct position and in good condition thermostat and relay 4 5 6 TROUBLE 8 Display shows all figures set but oven does not operate the all keys CONDITION CHECK RESULT CAUSE REMEDY No operation Check continuity H No continuity gt Defective Replace of All Keys Of secondary Secondary switch Secondary switch Switch with And secondary And secondary Door Closed continuity switch Connector Switch wire connector Check the m Defective Replace I connection Assembly Assembly Between connector anue B gt continuity m Loose connection gt Connection Assembly tightly
10. Check for P C B connector 134 579 11 Cooking Start OFF Wire leads removed Note Relay Relay 1 P T C Relay Positive Temperature Coefficient Relay 2 Convection Motor Relay 3 Fan motor Relay 4 Halogen Heater Relay 5 Up sheath heater Relay 6 Back sheath heater Relay 7 Microwave Relay 8 Oven lamp Relay 10 Damper Motor un Relay 1 2 3 4 5 6 7 8 10 Cooking Start 524 Wire leads removed Measure the resistance Ohm meter scale R x 1 Normal Approx 60 ohm Abnormal Infinite or several ohm STIRRER MOTOR Wire leads removed LGE Internal Use Only Measure the resistance Ohm meter scale R x 1000 5 13 Normal Approx 10 20 kohm Abnormal Infinite or several ohm Copyright O 2007 LG Electronics Inc All right reserved Only for training and service purposes 5 TEST PROCEDURE RESULTS CIRCULATION MOTOR Measure the resistance Normal Approx 250 ohm Wire leads removed Multi meter scale R x 1 Abnormal Infinite or several ohm KEY PCB Check continuity between switch terminals by pressing an appropriate pad on key board The contacts assignment of the respective pads on the key board is as shown left figures Main P C B gt NOTE A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS
11. Normal Infinite Abnormal Continuity Copyright O 2007 LG Electronics Inc All right reserved Only for training and service purposes 5 TEST PROCEDURE RESULTS FUSE H V FUSE Check for continuity of the fuse with an multi meter Normal Abnormal C NOTE If the fuse is blown check the primary the secondary and the monitor switches H V D and H V C before replacing the fuse If the fuse is blown by improper switch operation replace the defective switch and the fuse at the same time Replace just the fuse if the switches operate normally HEATER ELEMENT Wire leads removed Measure the resistance Multi meter scale Rx1 Normal Upper sheath heater Approx 37 ohm 230V 1350W Back sheath heater Approx 77 ohm 230V 750W Upper Halogen heater Approx 15 ohm 230V 450W at 20 30 Measure the resistance with 500V 100M ohm insulation resistance meter Normal more than 0 5 Mohm NOTE Make sure heater is fully cooled when tested MAGNETRON and OVEN THERMOSTAT OVEN Thermostat 0 C 160 C M G T Thermostat 60 C Approx 145 C Copyright 2007 LG Electronics Inc All right reserved 5 12 Only for training and service purposes LGE Internal Use Only COMPONENTS TEST PROCEDURE RESULTS Disconnect the 11 pin connector from P C B Refer to schematic diagram
12. 5 1 MEASUREMENT OF MICROWAVE POWER OUTPUT 5 3 DISASSEMBLY AND ADJUSTMENT I I I III I III 2 5 3 INTERLOCK CONTINUITY TEST 5 orto ore i uo odo cse nice Rove 5 9 COMPONENT TEST PROCEDURE III III III 5 10 TROUBLE SHOOTING etn ee ud 5 15 I2 CJRebPISPRUAUELITDOIIIDBIIITTITITITUIMIEEENEES 6 1 REPLACEMENT PARTS LIST Leuueeer erre 7 1 LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes SPECIFICATIONS MODEL MP 32971XC Power Requirement 230 Volts AC 50 Hz Single phase 3 wire grounded max 2700W Microwave 1300W Grill 1900W Combination max 2200W Convection 2200W Power Output 700 Watts full microwave power IEC60705 Microwave Frequency 2450 MHz Magnetron 2M246 Timer 0 90 min Outside Dimensions 527 W x 366 H x 472 D mm Cavity Dimensions 440 W x 235 H x 310 D mm Net Weight 23 kg Shipping weight 28 kg Control Complement 1 Microwave Power level 4 Grill Combi max 700W 450W 300W 180W 90W Grill MW 90W 180W 300W 450W 2 GRILL 5 Convection Combi Upper Sheath Heater 1350W Upper Sheath Heater 1350W Upper Halogen Heater 450W Upper Halogen Heater 450W 3 Convection 40 C 100 230 C 6 Convection Combi Back Sheath Heater 750W Convection MW 90W 180W 300W 45
13. A PRIMARY INTERLOCK SWITCH TEST B SECONDARY INTERLOCK SWITCH TEST When the door is closed slowly an audible click should be heard at the same time or successively at intervals When the door is opened slowly 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 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 terminal of the switch The meter should indicate C MONITOR SWITCH TEST 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 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
14. BEFORE YOU BEGIN READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY INSTALLING EARTHING INSTRUCTIONS 1 Empty the oven and clean inside it with a soft This oven is designed to be used in a fully earthed damp cloth Check for damage such as misaligned condition door damage around the door or dents inside the It is imperative therefore to make sure it is properly cavity or on the exterior earthed before servicing 2 Put the oven on a counter table or shelf that is strong enough to hold the oven and the food and WARNING utensils you put in it Use care when handling THIS APPLIANCE 3 Do not block the vent and the air intake openings MUST BE EARTHED Blocking vent or air intake openings can cause damage to the oven and poor cooking results Make sure that the microwave oven legs are in IMPORTANT place to ensure proper air flow The wires in this mains lead are colored in 4 The oven should not be installed in any area where accordance with the following code heat and steam are generated because they may damage the electronic or mechanical parts of the Green and yellow Earth unit Blue Neutral Do not install the oven next to a conventional Brown Live surface unit or above a conventional wall oven 5 Use the oven in an ambient temperature less than As the colors of the wires in the mains lead of this 104 F 40 C appliance may not correspond with the colored markings identifying the terminals in
15. PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON MAKE SURE THE WIRE LEADS ARE CORRECT POSITION WHEN REMOVING THE WIRE LEAD FROM THE PARTS BE SURE TO GRASP THE CONNECTOR NOT THE WIRES Copyright 2007 LG Electronics Inc All right reserved 5 14 LGE Internal Use Only Only for training and service purposes TROUBLE SHOOTING WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER EVALUATE THE COMPLAINT CAREFULLY IF THE FOLLOWING SYMPTOMS APPLY PLEASE INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE OVEN THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL CAUTIONS 1 Check grounding before checking for trouble 2 Be careful of the high voltage circuit 3 4 Discharge the high voltage capacitor See page 2 1 When checking the continuity of the switches or of the high voltage transformer disconnect one lead wire from these parts and then check continuity with the AC plug removed To do otherwise may result in a false reading or damage to your meter damage this control panel Do not touch any part of the circuitry on the digital programmer circuit since static electric discharge may Always touch yourself ground while working on this panel to discharge any static charge built up in your body CONDITION CAUSE REMEDY The oven Inserting many plug into one Avoid using other electrical does not work plug outlet and using appliances when you use Output power is too low
16. Wrench size 5mm Nutdriver size 5mm Adjustable wrench e Soldering iron Solder Vinyl insulation tape Polishing cloth NECESSARY MEASURING INSTRUMENTS TESTER VOLTS DC AC Ohmmeter Microwave survey meter Holaday 1500 1501 Narda 8100 8200 Inch scale 600 non conductive material beaker glass plastic inside diameter approx 8 5 cm 3 2 in and made of borosilicate glass vessel max thickness 3 mm outside diameter approx 190mm height approx 90mm Glass thermometer 100 C 212 F 1 deg scale 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 manufacture 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 If the oven operates with the door open the service personnel should Tell the user not to operate the oven Contact the manufacturer The service personnel should check all surface and vent openings for microwave leakage Check for microwave leakage after every servicin
17. for training and service purposes 6 5 LGE Internal Use Only EV INTERIOR PARTS I Ou N N Sie Copyright 2007 LG Electronics Inc All right reserved 6 6 LGE Internal Use Only Only for training and service purposes 1 SOCZZH SOCZZH SOCZZH 4 5 WNHOOS P 5 7 158 0402414 6 158 0402418 BH 4 WSz002 1SBF040241djVIS 15 0402418 BH WSZ002 15820402415 158 0402418 BH WSZ002 IS IS IS P002 TPL0302018 1 1TPL0302018 1 WT WTPO002 WT 10 11 12 P005 13 P007 TPLO302618 pH 1TPLO303118 TPLO40241 2 4MM Mg WT 13 13 TPLO40241 H 2 4MM 8MM M 3405011 TH 14 1 1 1 1 Ms 1 1 1 TTO11 W WTTO21 WTTO21 1 8 1 8 1 3 1 4 2 T7021 111040241445 W WTTO21 WTTO21 1771040241 710402418 TH 1 1040242 7710402422 TH 1 TTO21 W WTT022 WTT022 TTL040242 TTL0402422 TH 1TTLO40281dVIS TH 2 4MM 12MM 1TTL040281jVIS 24 12MM 1TTLO40281jVIS 24 12MM 1 028 028 W W WTT028 W TT028 TTLO402818VIS 24 12MM WTTO28 WTTO28 333901 43501R 43501 535501 335505 33651 132136 SOFZZA bmc 55900 466003 466003 466001 466001 45 3B74133N FUSE DRAWING 65T
18. reserved 5 6 LGE Internal Use Only Only for training and service purposes INTERLOCK SYSTEM 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 2 MOUNTING OF THE PRIMARY MONITOR SECONDARY SWITCHES TO THE LATCH BOARD ADJUSTMENT DIRECTION MONITOR SWITCH PRIMARY SWITCH SECONDARY SWITCH 3 INSTALLATION AND ADJUSTMENT OF THE LATCH BOARD TO THE OVEN ASSEMBLY Mount the latch board to the oven assembly Adjust the latch board in the arrow direction so that oven door will not have any play in it when the door is closed Tighten the mounting screw L RELAY PCB ASSEMBLY 1 Disconnect the leadwire from relay PCB 2 Remove the two screws holding relay PCB assembly 3 Remove the relay PCB assembly from cavity assembly 4 Remove two screws holding relay PCB 5 Remove the relay PCB from relay PCB support LGE Internal Use Only 5 7 M UPPER SHEATH HEATER REMOVAL 1 Remove three hex nuts holding the sheath heater 2 Remove gasket and bracket holding heater 3 Remove the thermister 4 Remove the sheath heater from the oven cavity T Nut P lt gt lt gt Insulator U Upper Heater C
19. the rear cover assembly Fan Motor Assembly H HIGH VOLTAGE CAPACITOR FUSE TRANSFORMER AND DIODE REMOVAL 1 Remove rear cover assembly 2 Discharge the high voltage capacitor 3 Disconnect the leadwire from transformer magnetron Fuse and capacitor 4 Remove the screw holding the transformer and remove the high voltage diode earth screw H V Capacitor e H V C BKT H V Diode H V Fuse 622 Copyright O 2007 LG Electronics Inc All right reserved Only for training and service purposes 1 CONVECTION MOTOR HEATER J THERMISTOR REMOVAL REMOVEL 1 Disconnect the leadwire from the reley PCB CN3 2 Remove the nut holding thermisters 3 Remove the screws of the thermister 1 Remove rear cover assembly 2 Disconnect the leadwire from powercord HVT convection heater MGT thermostat MGT damper assembly Nut 3 Remove damper assembly 8 4 Remove MGT assembly 5 Remove the six screws holding the insulater B NOA assembly A 6 Remove the insulater B assembly 7 e Thermistor 7 Remove the nut holding the convection fan 8 Remove the convection fan 9 Remove the two screws holding the convection motor 10 Remove the convection motor 11 Remove the three screws holding heater sreeket 12 Remove thhe convection heater from bracket Insulator B Assembly Copyright 2007 LG Electronics Inc All right
20. 0W Upper Sheath Heater 1350W 7 Auto Cook SC 1 Frozen Pizza SC 4 Chicken Pieces SC 7 Roast Beef 5010 Fresh Vegetables SC 2 French Fries SC 5 Beef Steaks SC 8 Jacket Potatoes SC 11 Frozen Vegetables SC 3 Whole Chicken 566 Roast Pork SC 9 Frozen Dinners 5012 Rice Pasta 8 Steam Cook St 1 Crustacea 514 Frozen Carrot 87 Spinach St 10 Apple 512 Shellfish St 5 Broccoli 18 Cauliflower 911 Chicken Breasts St3 Fish Fillet 516 Frozen Green Beans 549 Potato 5112 Sausage Rating Label Rating Label Location Accessories Owner s manual amp Cook book Metal tray Rack Steamer This oven is designed for household use only It is not recommended for commercial purposes Copyright 2007 LG Electronics Inc All right reserved 1 1 LGE Internal Use Only Only for training and service purposes CAUTIONS Unlike other appliances the 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 NEVER TOUCH any oven components or wiring during operation BEFORE TOUCHING any parts of the oven always remove the power plug from the outlet For about 30 seconds after the oven stops an electric charge remains in the high voltage capacitor When replacing or checking you must disch
21. 7 349861 108 550123 109 35012 T 135008 118 13500 119 350128 120 550121 121 MFLSS2 122 123 533008 124 33034A 125 14970 126 54980P CONTENTS Page SAFETY PRECAUTIONS ennemi nent Inside front cover SPECIFICATIONS 1 1 CAUTIONS 2 1 INSTALLATIONS 3 1 OPERATING INSTRUCTIONS 4 1 FEATURES IRE E EU E ER 4 1 4 1 OPERATING SEQUENCE MH 4 2 SCHEMATIC DIAGRAM 4 3 CIRCUIT DESCRIPTION A eeeee Mee 4 4 SERVICE INFORMATION eee eere rrr rrr nnn nnn 5 1 TOOLS AND MEASURING INSTRUMENTS 5 1 MICROWAVE LEAKAGE
22. ITCH O O H V MONITOR TRANS SWITCH FORMER RELAY 4 77 SECONDARY 97 SWITCH The fan motor rotates and cools the magnetron by blowing the air coming from the intake on the back cover The air is also directed into the oven to exhaust the vapor in the oven through the upper plate Cooking time starts counting down 3 3 volts AC is generated from the filament winding of the high voltage transformer This 3 3 volts is applied to the magnetron to heat the magnetron filament through two noise preventing choke coils A high voltage of approximately 2100 volts AC is generated in the secondary of the high voltage transformer which is increased by the action of the high voltage diode and charging of the high voltage capacitor The negative 4000 Volts DC is applied to the filament of the magnetron WHEN THE OVEN IS SET AT ANY LEVEL EXCEPT MAXIMUM The micom controller controls the ON OFF time of relay 4 by the applied signal to vary the average output Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes power of oven as POWER LEVEL refer to page 1 1 One complete cycle of relay 4 is 32 seconds WHEN THE DOOR IS OPENED DURING COOKING Both the primary switch and relay 4 are cut off primary winding voltage of the high voltage transformer ON OFF of relay 4
23. Internal Use Only Only for training and service purposes SCHEMATIC DIAGRAM JOJO JOJO 1010 N WS 13319143309 3ALLISOd O Jeduueg TO 1 MOTI3A ANY N33H9 9 sisseuo Joyoedeo y Aq 1 ONIOIAH3S 340438 ADVLIOA LAVH V1 13 H3193NNOO3G SNDINHOSL NOLLN3AH3LNI LNVAV HOLIMS MS MNId HM du MOTI3A MOV1d anid 19 essey N3dO SI HOOG ILON J0jesuepuoxs amp Bunuuedsuoou 1 MS Wa SAH ZAH uo t En E m 9AH SAH re m T n JO SIWOY
24. NOTE 1 After replacing the door be sure to check that the primary Switch monitor switch and secondary switch operate normally 2 After replacing the door check for microwave energy leakage with a survey meter Microwave energy must be below the limit of 5 mW cm with a 275 ml water load 3 When mounting the door assembly to the oven assembly be sure to adjust the door assembly parallel to the chassis Also adjust so the door has no play between the inner door surface and oven frame assembly If the door assembly is not mounted properly microwaves may leak from the clearance between the door and the oven 3 4 5 D MAIN PCB ASSEMBLY 1 Remove choke cover for door assemply 2 Remove the two screws holding PCB bracket Disconnect two leadwires from Main PCB Remove the seven screws holding Main PCB 6 Remove the Main PCB from door assembly NOTE 1 Be sure to use now choke cover assembly when you reassembly PCB assembly Remove PCB bracket Please use the JIG 22 2 383EW5A224A below for door removal Choke Cover DOOR JIG P No 383EW5A224A Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes E REAR COVER ASSEMBLY REMOVAL 1 Remove screws on the rear cover assembly 2 Disconnect the leadwire from Fan Motor and lift out the rear cover assembly Re
25. S 100 H 50FZZA 46 WSZ232 47 140261 48 4026W1A033LATCH SPHC SILVER 1 PCY 140268 49 4051w1A00i Connector Assembly MP 906ML WHITE W 340511 50 4510W1A006A 44510 51 4810 1 372 34810H 54810C 14890A 34890 14970A S 4 1PZZW1A002 PIN DRAWING ARALLEL 5MM 14 81 WPZ016 E 92 I H 2 4MM 8MM M3 q 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 52 53 54 55 Non EN 6 EM EA 19 um 16 EM 18 19 20 21 22 23 24 25 _ 26 27 28 29 30 33 34 35 36 x 38 39 4 2 ET 4 E 48 49 50 53 54 56 MB70188C wsos 57 4870770 64781 35300 62 568510 63 568510 64 56201A 65 56201A 56322A 67 56324A 56411A 365495 70 565498 71 J oowikoiD 7 46600 2 _ esoowikooid 46600 73 268771 74 56901A 75 569128 76 569128 77 56930V 78 56930M 73 13581A STIRRER 220 240 9 55893A 81 13551 82 13552 83 55262 84 56170 85 34810 63302 87 55013 88 26871 33701A 568771 91 36549V 92 36549 93 568711 94 95 000 97 24810 55810 548100 100 548101 101 331120 102 535041 103 535042 104 33052 105 33550 106 33808 10
26. ar Cover Assembly Fan Motor Terminal LGE Internal Use Only MAGNETRON REMOVAL 1 Remove rear cover assembly 2 Disconnect the leadwire from damper motor damper motor switch MGT thermostat 3 Disconnect the leadwire from the high voltage transformer and magnetron 4 Remove the screw holding the damper assembly 5 Remove the damper assembly 6 Carefully remove the mounting screws holding the magnetron and the wave guide 7 Remove the magnetron until its dome is clear from the wave guide NOTE 1 When removing the magnetron make sure its dome does not hit any adjacent parts or it may be damaged 2 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 3 After replacing the magnetron check for microwave leakage with a survey meter around the magnetron Microwave energy must be below the limit of 5 mW cm With a 275 ml water load Make sure that gasket is rigidly attached to the magnetron To prevent microwave leakage tighten the mounting screws properly making sure there is no gap between the waveguide and the magnetron Magnetron Thermostat Bracket Assembly Magnetron Thermostat LGE Internal Use Only G FAN MOTOR ASSEMBLY REMOVAL 1 Remove rear cover assembly 2 Remove the three screws holding the fan motor assembly 3 Remove the fan motor assembly to
27. arge the high voltage capacitor by shorting across the two terminals with an insulated screwdriver Remove your watches whenever working close to or replacing the Magnetron NEVER operate the oven with no load NEVER injure the door seal and front plate of the oven cavity NEVER put iron tools on the magnetron NEVER put anything into the latch hole and the interlock switches area LGE Internal Use Only 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 sure that the magnetron gasket is properly installed around the dome of the tube whenever installing the magnetron Gasket COOLING FIN MAGNETRON CHASSIS GROUND MAGNETRON THE OVEN IS TO BE SERVICED ONLY BY PROPERLY QUALIFIED SERVICE PERSONNEL Copyright O 2007 LG Electronics Inc All right reserved Only for training and service purposes INSTALLATIONS
28. ce Ohm meter scale Rx1 and Rx100 Primary winding Approx 2 5 ohm Secondary winding Approx 190 ohm Filament winding Less than 1 ohm 2 Measure the resistance Ohm meter scale Rx1000 Primary winding to ground Normal Infinite Filament winding to ground Normal Infinite MAGNETRON Wire leads removed 1 Measure the resistance Ohm meter scale Rx1 Normal Less than 1 ohm Filament terminal 2 Measure the resistance Ohm meter scale Rx1000 Normal Infinite Filament to chassis Copyright 2007 LG Electronics Inc right reserved 5 10 LGE Internal Use Only Only for training and service purposes COMPONENTS TEST PROCEDURE RESULTS NOTE When testing the magnetron be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition HIGH VOLTAGE CAPACITOR Measure the resistance Ohm meter scale Rx1000 Terminal to terminal Normal Momentarily indicates several ohms and then gradually returns to infinite Measure the resistance Ohm meter scale Rx1000 Terminal to case Normal Infinite HIGH VOLTAGE DIODE NOTE Some inexpensive meters may indicate infinite resistance in both direction LGE Internal Use Only Measure the continuity Forward Ohm meter scale Rx10000 Normal Continuity Abnormal Infinite Measure the continuity Reverse Ohm meter scale Rx10000
29. closed 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 switch Wire leads removed with a Multi meter Door open Primary Switch NN Monitor Switch Secondary Switch correctly connected LGE Internal Use Only 5 9 NOTE After checking for the continuity of switches make sure that are Copyright O 2007 LG Electronics Inc All right reserved Only for training and service purposes COMPONENT TEST PROCEDURE 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 WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER SEE PAGE 2 1 2 ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD 1 LITER OF WATER IN CONTAINER IN THE OVEN COMPONENTS TEST PROCEDURE RESULTS HIGH VOLTAGE TRANSFORMER Wire leads removed FILAMENT WINDING TERMINAL SECONDARY TERMINAL TERMINAL 1 Measure the resistan
30. eakage should not be more than 4 mW cm sq 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 LGE Internal Use Only MEASUREMENT OF MICROWAVE POWER OUTPUT Microwave power output measurement is made with the oven supplied at its rated voltage and operated at its maximum microwave power setting with a load of 1000 5 g potable water 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 The oven and the empty vessel are at ambient temperature prior to the start of the test e The initial temperature 1 of the water is 10 2 C It is measured immediately before the water is added to the vessel After addition of the water to the vessel the load is immediately placed on the center of the shelf which is in the lowest position and the microwave power switched on The time T for the temperature of the water to rise by a value AT of 10 2 K is measured where T is the time in seconds and AT is the temperature rise The initial and final water temperatures are selected so that the maximum difference between the final water temperature and the ambient temperature is 5 The microwave power output P
31. er voltage and Lower voltage Continuity transformer transformer 2 T Ad m No continuity Defective power gt Replace power nhe EN supply cord supply cord Copyright O 2007 LG Electronics Inc All right reserved Only for training and service purposes TROUBLE 3 Display shows all figures set but oven does not start cooking while desired program times are set and START button is touched CONDITION CHECK RESULT CAUSE REMEDY TET TE Defective Replace pou does _ nin MM 1 secondary switch um 274 switch not count down of secondary when touching switch with 2 e 5 START button door closed rt gt Continuity connector connector Check the con e Defective P C B Replace P C B p gt nection between assembly assembly connector and P C B assembly i Continuity Loose connection 1 then 2 Fan motor Stirrer motor Abnormal Defective oven Replace oven c motor or damper motor lamp turntable lamp turntable oven lamp motor motor stirrer motor Normal do turn TROUBLE 4 Oven seems to be operation but little heat is produced in oven load
32. g The power density of the microwave radiation leakage emitted by the oven should not exceed 4 mW cm Always start measuring of an unknown field to assure safety for operating personnel from radiation leakage LGE Internal Use Only MEASURING MICROWAVE ENERGY LEAKAGE Pour 275 15 of 20 5 68 9 water a beaker which is graduated to 600 cc and place the beaker on the center of the turntable Set the energy leakage monitor to 2450 MHz and use it following the manufacturer s recommended test procedure to assure correct result When measuring the leakage always use the 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 2 Probe scanning speed Less than 2 5 cm sec 1in sec Copyright O 2007 LG Electronics Inc All right reserved Only for training and service purposes MEASUREMENT WITH OUTER CASE REMOVED 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 Circled area of below Fig Around the magnetron The waveguide WARNING AVOID CONTACTING ANY HIGH VOLTAGE PARTS
33. in watts is calculated from the following formula 4187 X AT 0 55 X T2 To XM T T2 Temperature after heating To Temperature of bowl M Weight of bowl is measured while the microwave generator is operating at full power Magnetron filament heat up time is not included The water is stirred to equalize temperature throughout the vessel prior to measuring the final water temperature e Stirring devices and measuring instruments selected in order to minimize addition or removal of heat P WATER LOAD Ces Nu TURNTABLE DISASSEMBLY AND ADJUSTMENT A OUTER CASE REMOVAL 1 Disconnect the power supply cord from the outlet 2 Remove the screws from the rear and along side edges of the case The outer case must be moved backward to be lifted off B POWER SUPPLY CORD 1 Remove the outer case 2 Disconnect two terminals and remove one screw of the earth terminal CAUTION DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE SERVICING refer to page 2 1 LGE Internal Use Only Copyright O 2007 LG Electronics Inc All right reserved Only for training and service purposes C DOOR GROSS ASSEMBLY REMOVAL 1 Disconnect the power cord 2 Remove the outer case 3 Disconnect the leadwire from the reley PCB 4 Open the door from oven insert into the choke cover hole of door 5 Lift the door from front cavity
34. is coupled electrically with opening and closing of the secondary switch When the door is opened the secondary switch is opened and when the door is closed the secondary Switch is closed The cooking time stops counting down Relay stops functioning As the door is opened if the contact of primary switch and relay 4 and or secondary switch fails to open the fuse opens due to the large current surge caused by the monitor switch activation which in turn stops PRIMARY FUSE SWITCH O O 4 4 HV MONITOR TRANS E SWITCH FORMER ps OTO RELAY 4 SWITCH CONTROLLER 99 magnetron oscillation WHEN TOUCHING THE START BUTTON WITH THE HEATER COOKING FUNCTION SELECTED The contacts of the primary switch and the secondary Switch close the circuit voltage is applied to the heater through thermostat as shown by the solid line THERMOSTAT Turntable rotates The fan motor rotates The air is also directed into the oven to exhaust the vapor in the oven through the base plate and back plate LGE Internal Use Only SERVICE INFORMATION TOOLS AND MEASURING INSTRUMENTS NECESSARY TOOLS Tools normally used for TV servicing are sufficient Standard tools are listed below Diagonal pliers Long nose pliers Phillips screwdriver Flat blade screwdriver
35. opyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 1 Remove the two screws holding stirrer fan motor P STIRRER FAN MOTOR REMOVAL 6 Remove the damper switch Stirrer Fan Motor 1 Disconnect the leadwire from lamp 2 Remove the lamp assembly fan insulator U 2 Remove the stirrer fan motor Q LAMP REMOVAL Insulator U 3 Remove the lamp from lamp assembly N UPPER HALOGEN HEATER REMOVAL 1 Disconnect the leadwire from halogen heater 2 Remove the screw holding bracket 3 Remove two bracket 4 Remove the halogen heater from reflector Reflecter REMOVAL 1 Disconnect the leadwire from damper motor O DAMPER MOTOR SWITCH damper switch 2 Remove the screw holding damper motor assembly 3 Remove the screw holding damper motor 4 Remove the damper motor 5 Remove the screw holding damper switch Damper Motor LGE Internal Use Only 5 8 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes INTERLOCK CONTINUITY TEST TYPE NO SZM V 16 FA 63 FOR PRIMARY SWITCH TYPE NO SZM V 16 FA 62 FOR MONITOR SWITCH NO SZM V 16 FA 63 FOR SECONDARY SWITCH WARNING FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS
36. r level 6 Enter Start Quick Start and cooking categories n order to start cooking which is selected press button one time 2 Clock Lamp The quick start feature allows you to set 30 seconds intervals of HIGH Clock You can set the time of day power cooking with a touch of the quick start button Lamp You can can see the foods while cooking by pressing this 7 Stop Clear You can stop over and clear all entries except time of day button 3 Steam chef Steam chef allows you to cook your favorite food by selecting the steam chef categories 4 Function Select You can select cooking categories 5 Control You can set cooking times temperature weight and cooking categories While cooking with auto and manual function you can lengthen or shorten the cooking time at any point by pressing the button except defrost mode LGE Internal Use Only 4 1 Copyright O 2007 LG Electronics Inc All right reserved Only for training and service purposes OPERATING SEQUENCE The following is a description of component functions 8 CONVECTION COMBI COOKING during oven operation
37. the unit Check H V Defective high Replace high transformer and voltage H V Fuse transformer and transformer and H V Fuse H V Fuse normal Check H V Apol Defective high Replace high voltage capacitor voltage capacitor normal Check Defective high Replace high diode Abnormal voltage Diode voltage Diode normal Check Abnonal Defective Replace Magnetron magnetron magnetron TROUBLE 6 Oven does not cook properly when programmed for the set power level Operates properly on HIGH CONDITION CHECK RESULT CAUSE REMEDY Output is full when Disconnect the gt Abnormal Defective P C B Replace P C B you set lower wire leads from assembly assembly power level relay 7 and check continuity relay 7 Operate the unit LGE Internal Use Only 5 19 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes TROUBLE 7 Heater Relay 4 Halogen Heater Relay 5 Up sheath Heater Relay 6 Back sheath Heater CONDITION CHECK RESULT CAUSE REMEDY 1 Heater is not Heater Abnormal Malfunction of the Replace operating heater Normal Thermostat and Malfunction of the gt gt L
38. ven does not operate at all Display window does not display any figures and no input is accepted lead connected from transformer CONDITION CHECK RESULT CAUSE REMEDY 1 Fuse blows gt Check continuity Continuity Malfunction of the Replace primary of monitor monitor switch and monitor switch with switches door closed No continuity Replace fuse Check continuity gt Continuity Shorted contact at gt desig of primary and monitor switch with primary switches door opened No continuity Disconnect Defective high Replace high gt Side of the wire voltage capacitor to the high voltage capacitor and operate the unit Fuse blows again L Defective high volt age transformer Replace high volt age transformer NOTE All these switches must be replaced at the same time Refer to page 5 6 5 8 2 Fuse does not blow Check continuity of magnetron LGE Internal Use Only No continuity Defective mag netron thermostat Replace mag netron thermostat 5 17 thermostat oven thermostat oven thermostat mn and Low
39. your plug 6 Place the oven on a sturdy and flat surface at least proceed as follows 10 cm 4 inches from the wall 7 Place the oven as far away as possible from TV The wire which is colored green and yellow must be RADIO COMPUTER etc to prevent interference connected to the terminal in the plug which is marked with the letter E or by the earth symbol L or 8 Do not touch the front glass during or after cooking colored green or green and yellow of the Grill and convection and Combination mode This glass is very hot during heater operating 9 ii 9 9 wire which is colored blue must be connected to the terminal in the plug which is marked with the letter 9 Do not operate the oven at microwave and N or colored black combination mode with Grill rack placed in the cavity when the oven is empty The wire which is colored brown must be connected to the terminal in the plug which is marked with the letter L or colored red 10cm Copyright 2007 LG Electronics Inc All right reserved 3 1 LGE Internal Use Only Only for training and service purposes OPERATING INSTRUCTIONS FEATURES STEAM PLATE B Control Panel STEAM COVER i Window Door Screen STEAM WATER BOWL METALTRAY 1 i CRISPING TRAY RACK METAL TRAY 2 3 4 1 5 6 7 1 Display Window You can show time of day cooking time powe
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