MICROWAVE OVEN SERVICE MANUAL
Contents
1. 9 e pue ye 10 seDejs eu Buruonoy ueuw Burzznq ON 4 LGE Internal Use Only 7 23 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ASSY 1010u1 A SSV 1 uone nueA JeuuoN eoe doud suni ON pueog pueog eoejdeu 1981003 joejuoo sung j9ejuoo 100d sung E LE ees 15 10 2euuoo jo joejuoo 2 42 06009 pue esnj JO 19ejuoo 34 2940 asny joejuoo pue Pn 3505 5 H3MOd L st HOIH jou Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 7 24 LGE Internal Use Only EV EXPLODED VIEW DOOR PARTS MODEL MVH1670ST Copyright 2007 LG Electronics Inc All right reserved 8 1 LGE Internal Use Only Only for training and se2. BR HIGH fs RY4 Pk GN CONDENSER BK COOKTOP LAMP BL SECONDARY SWITCH TURNTABLE MOTOR YL MONITOR SWITCH ao w TRANSFORMER 00000000000000000 7 WH DIODE CAPACITOR CONTROL MODULE WH RDGY BKBLPKBRBL CNYL 12345 67 8 9 101 12 12 PIN CONNECTOR CN1 5 1 WIRE COLORS SYMBOL COLOR WH WHITE BK BLACK RD RED YL YELLOW PK PINK BL BLUE BR BROWN GN GREEN GY GREY Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes MATRIX CIRCUIT FOR TOUCH KEY BOARD L8 31 4 15 6 AUTO KITCHEN TIMER EZ ON DEFROST SOFTEN LESS POWER QUICK LEVEL DEFROST Copyright 2007 LG Electronics Inc All right reserved 5 2 LGE Internal Use Only Only for training and service purposes 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 Aluminum foil should be avoided because it will disrupt cooking and may cause arc
3. yong eouejsiseH 1 21 2 pue ees LS 1 Jaye yono eouejsiseJ joejuoo joejuoo suny 191109 1 LS oouelsisoJ joejuoo yo joejuo2 e USUM 128109 Jo pue 1981109 jou seop ejds q g INATGOUd eouejsisel Suonoeuuoo 10911090 suny 109 409 LNO 2 uid pue noo 1VISOWH3HL ALIAVO 81 uo 9NIMOT8 ISNA HOS 100903HO 9es ISNA 2 5 H3MOd H9940 Si pJo9 Ajddns ueuw mopuim ejdsip reedde jou seop JO INIL 13 3SV3 1d V W380Hd apno oyu d T3H 91 1 9 eBed uo NOLLWHAdO 1 sity SNILOOHS 3718NOUL 2 541919014 22 9 LGE Internal Use Only 7 21 Copyright 2007 LG Electronics Inc All ri
4. 2 Remove the control panel with pushing it upward 3 Remove the three connectors CN1 CN2 CN3 and wire leads Relay7 from the circuit board carefully Control Panel Control Bracket Power Transformer FPC Connector S1 CNS For the ud model only 4 A Relay 7 Ja ba Circuit Board Control Bracket CN1 CN5 For the sensor model only Relay 2 S 2 SR Relay 7 Relay 7 White FPC Connector S1 L 2 Circuit Board Figure 1 CN1 Figure 3 LGE Internal Use Only 7 4 Copyright 2007 LG Electronics Inc All right reserved 4 Remove 3 screws securing the circuit board Circuit Board Circuit Board Figure 2 5 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 Only for training and service purposes HOW TO REMOVE THE F P C CONNECTOR Follow the steps below as illustrated in Figures 4 and 5 to remove the F P C connector 1 Hold the edges of the plastic fastener with thumb and forefinger Figure 4 2 Lift up the lever of the plastic fastener from the terminal socket by lightly pressing the lever end with forefinger Figure 5 3 Remove the F P C connector from the terminal socket Plastic fastener Connector Terminal socket Figure 4 Plastic fas
5. 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 closed Primary co o Switch AN Ca Monitor Switch S Secondary o Switch ae 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 SZM V01 FA 33 OR VP 533A OF OR VP 133A OD OR V 5230Q FOR SECONDARY SWITCH LGE Internal Use Only 7 14 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes TEST AND CHECKOUT PRECEDURES AND TROUBLESHOOTING 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 OVEN A TEST PROCEDURES COMPONENTS TEST PROCEDURES
6. Check microwave energy leakage must be below the limit of 5 mW cn All service adjustments should be made for minimum microwave energy leakage readings Discinnect the wireleads 1 2 3 Remove outcase 4 b Remove the Magnetron very carefully mount all Figure 13 LGE Internal Use Only 7 8 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes E REMOVING STIRRER FAN DISK Figures 14 a and 14 b 1 Remove 1 rivet ASS Y securing it to the oven upper plate by using knife blade 2 Rotate slightly and pull out the stirrer fan cover 3 Remove the stirrer fan disk Figure 14 a Figure 14 b Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes F REMOVING DOOR Figure 15 a 1 Remove the vent grille by removing two screws securing it to the front bracket 2 Lift up and push the door NOTES After replacing the door be sure to check that the primary interlock switch the secondary interlock switch and the interlock monitor switch operate normally After replacing the door check for microwave energy leakage with a survey meter Microwave energy leakage must be below the limit of 5mW cm With a 275 ml water load Figure 15 a G DISASSEMBLING DOOR Figure 15 b 1 Remove the dielectric choke by using knife blade or small screw driver e
7. ND 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 in Figure 22 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 22 b for close up view of gaps A and B door latches If all gaps are less than 1 64 0 5 mm 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 check the sequence of the switches in steps 5 and 6 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes TEST THE LATCH AND SWITCH SEQUENCE 5 Open the oven door slowly Watch the door latch the Secondary Switch Release Rod and Lever on the switches to make sure they are zero
8. RES AND SPECIFICATIONS FEATURES Mee 6 1 SERVICE INFORMATION H nennen nennen 7 1 PRECAUTIONS AND REPAIR SERVICE TIPS eee 7 1 MICROWAVE LEAKAGE TEST 7 2 POWER OUTPUT MEASUREMENT 7 3 DISASSEMBLY INSTRUCTIONS Henne nennen nnne nennen 7 4 INTERLOCK SYSTEM e nnne nennen nennen nnne nennen 7 12 INTERLOCK CONTINUITY TEST nnne 7 14 TEST AND CHECKOUT PROCEDURES AND TROUBLE SHOOTING M 7 15 TEST PROCEDURES HH nennen enne nennen 7 15 CHECKOUT PROCEDURES Hn nnne 7 18 C TROUBLE SHOOTING HH 7 21 EXPLODED VIEW nnne nennen niin nennen enini nennen enne nnne nennen 8 1 REPLACEMENT PARTS LIST nennen 9 1 LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes SPECIFICATIONS Rated Power Consumption Microwave Output Frequency Power Supply Rated Current Magnetron Cooling Rectification Door Sealing Safety Devices Magnetron High Voltage Capacitor High Voltage Diode Cook top Lamp Cavity Lamp Timer Tray Overall Dimensions Oven Cavity Size Effective Capacity of Oven Cavity Accessories Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 1500W maximum Microwave oven Cook top lamps Ventilation fan 1000W IEC60705 2450 MHz 50 MHz 120 VAC 60 Hz 13 Amp Microwave oven Cook top lamp Ventilation fan Forced Air Cooling Rectification Voltage D
9. RESULTS TRANSFORMER FILAMENT SECONDARY WINDING WINDING PRIMARY WINDING 1 Remove wire leads 2 Measure resistance ohm meter scale Rx1 Primary winding Approx 0 3 to 0 5 ohm Secondary winding Approx 65 to 120 ohm Filament winding 0 ohm 3 Measure resistance ohm meter scale Rx1000 Primary winding to ground Normal Infinite Filament winding to ground Normal Infinite MAGNETRON Anena Gasket 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 Filament terminal 3 Measure resistance ohm meter scale Rx1000 Normal Infinite Filament to chassis Copyright 2007 LG Electronics Inc All right reserved 7 15 LGE Internal Use Only Only for training and service purposes COMPONENTS TEST PROCEDURES RESULTS 1 Remove wire leads CAPACITOR 2 Measure resistance ohm meter scale Rx1000 e Terminal to terminal Normal Momentarily infinite and then soon reach 10 Mega ohms e Terminal to case Normal Infinite lt DIODE 1 Measure continuity Forward Normal Continuity Some inexpensive ohm meters may indicate infinite resistance in both directions ohm meter scale Rx1000 2 Measure continuity Reverse ohm meter scale Rx1000 Abnormal Below 100 ohms Normal Infinite Abnormal Be
10. TB GoldStar MICROWAVE OVEN MODEL MVH1670ST CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL August 2007 P NO MFL05746502 Printed in Korea CAUTION SAFETY PRECAUTIONS 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 Proper operation of the microwave ovens requires th
11. akage must bebelow the limit of 5 mW cm All service adjustments should be made for minimum microwave energy leakage readings Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 7 1 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 c 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 f 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 intact 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 by passed LGE Internal Use Only MICROWAVE LEAKAGE TEST CAUTIONS Be sure to check microwave leakage prior to servicin
12. als and the latches should activate the Connect the ohmmeter leads to the common switches with an audible click COM and normally open NO terminals of the If the latches do not activate the switches when switch The meter should indicate a open circuit in the door is closed the switches should be a the door open condition When the door is closed adjusted in accordance with the adjustment meter should indicate an closed circuit When the procedure secondary switch operation is abnormal make the Disconnect the wire lead from the primary switch necessary adjustment or replace the switch only Connect the ohmmeter leads to the common with the same type of switch COM and normally open NO terminal of the switch The meter should indicate an open circuit C MONITOR SWITCH TEST 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 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
13. argarine chocolate cheese marsh mallow SOFTEN Touch this pad to soften butter ice cream cream cheese frozen juice KITCHEN TIMER Touch this pad to set the kitchen timer HOLD WARM Touch this pad to keep hot cooked foods warm in your microwave oven for up to 99 minutes 99 seconds POWER LEVEL Touch this pad to select a cooking power level TIME COOK Touch this pad to set a cooking time LESS Touch this pad to subtract ten seconds of cooking time each time you press it CLOCK Touch this pad to enter the time of day EZ ON Touch this pad to set and start quickly at 100 power level START Touch this pad to start a function If you open the door after oven begins to cook retouch LIGHT HI LOW OFF Touch this pad to turn the cooktop countertop light on or off LGE Internal Use Only OVERALL CIRCUIT DIAGRAM SCHEMATIC DIAGRAM Note 1 DOOR OPENED amp COOK OFF MODE 2 LIVE TERMINAL OF LAMP SOCKET MUST BE CONNECTED WITH BLACK OR BLUE WIRE ono NOISE FILTER ASM WH 120 VAC 60HZ SINGLE PHASE ONLY THERMOSTAT BL WH H H LGE Internal Use Only PRIMARY SWITCH H 28 i LY E B RD RY6 T T MOTOR 4 LA RY 4 BK OVEN LAMP WH Be DT Hr H 1 CL HIGH LN 0 BL RYB p CL ay 31 1 p GN SLOW
14. at 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 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 2007 LG Electronics Inc All right reserved 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 TABLE OF CONTENTS Page SAFETY PRECAUTIONS ennemi nnrenenn nnne nnne Inside front page SPECIFICATIONS nennen nne eene 1 1 CAUTIONS ee eret ctetu uUo Acn Lcd eec begun 2 1 INSTALLATIONS Henne 3 1 OPERATING INSTRUCTIONS 4 1 CONTROL PANEL nnne 4 1 CONTROL PANEL INSTRUCTIONS eee 4 2 OVERALL CIRCUIT DIAGRAM nennen nennen nnne nennen enne nnne nennen 5 1 SCHEMATIC DIAGRAM 5 1 SCHEMATIC DIAGRAM 11 nennen nennen nnne nennen nnne 5 2 MATRIX CIRCUIT FOR TOUCH KEY BOARD Hee eee 5 3 GENERAL INFORMATION FOR SERVICE HH HH eee 6 1 GENERAL PRECAUTIONS IN USE nennen 6 1 TRIAL OPERATION 6 1 FEATU
15. d or the interlock monitor switch the door is opened Fuse blows when the door is closed and Malfunction of the high voltage transformer the high START ENTER key is touched voltage capacitor including the diode the magnetron the blower motor or the circuit board NOTES e If the fuse is blown by an improper switch operation replace all switches and the fuse at the same time After replacing the defective switches with new ones make sure that they are correctly connected Check for microwave energy leakage according to INTERLOCK ADJUSTMENT PROCEDURES on page 7 12 when the primary interlock secondary interlock switches and or the interlock monitor switches are adjusted or replaced LGE Internal Use Only 7 18 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 2 CHECKOUT PROCEDURES FOR RELAY PROBLEM A Vent fan motor and oven lamp turn on without touching START key when the door is closed p Remove the mate connector of I O D GEO CON from the circuit board Does the unit still operate ls 5 Replace the circuit board Defective RELAY1 12 Replace RELAY1 12 PROBLEM B Vent fan motor and oven lamp turn on When the door is closed and START key is touched pe Measure the voltage at pin NO D ay 47 50 of U01 48 49 51
16. et openings 2 Microwave energy leakage must not exceed the values prescribed below NOTES Leakage with the outer panels removed less than 5 mW cm 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 POWER 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 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 190mm 3 The oven and the empty vessel are at ambient temperature prior to the start of the test 4 The initial temperature T1 of the water is 10 2 C 50 F It is measured immediately before the water is added to the vessel After addition of the water to the vessel the load is immediately placed on the center of the turntable which is in the lowest position and the microwave power switched on b 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 K 6 The microwave power o
17. g 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 and CDRH Center for Devices and Radiological Health immediately NOTE Address on CDRH Office of Compliance HFZ 312 Center for Devices and Radiological Healthe 1390 Piccard Drive Rockville MD 20850 The service personnel should check all surface and vent openings for microwave leakage Check for microwave leakage after every servicing The power density of the microwave radiation leakage emitted by the microwave oven should not exceed 4 mW cm Always start measuring of an unknown field to assure safety for operating personnel from radiation leakage EQUIPMENT TESTER VOLTS DC AC Ohmmeter Microwave survey meter Holaday HI 1500 HI 1501 Narda 8100 8200 600 cc non conductive material beaker glass or plastic inside diameter approx 8 5 cm 3 in Glass thermometer 100 C
18. ght reserved Only for training and service purposes eoe deu O NH 91 4 ees GAH Ainuguoo 090 OH eoejdeg 5 D o 1911090 91 ees 99UP SISOJ Jo eui X90049 61 ees JeuuoJsueJ A H Jo eouejsisei eunseoj LAH eoejdeu eouejsiseH MO 1921109 joejuoo JeuuoN 1091109 joejuoo 4004 LS Jo JORJUOD YOOYD 91 4 ees Jo eui 40949 eoejdeud l1VISONWH3HI 2 S3HOLIMS MOOTHALNI AHVINOO3S ANY AHVIAIHd L 49849 H3MOd 40 s 14715 umop ejdsip dn yeay jou seop 3 Wa 8OHd Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 7 22 LGE Internal Use Only nouo nouo
19. he oven cavity Figure 20 4 Disconnect the leadwire from the turntable motor terminals 5 Remove the 1 or 2 screws securing the turntable motor to the oven cavity ASS Y Figure 21 Er Wire Leads b Turntable Motor Figure 21 Copyright 2007 LG Electronics Inc All right reserved 7 11 LGE Internal Use Only Only for training and service purposes INTERLOCK SYSTEM INTERLOCK SYSTEM 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 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 latch board Latch Board Secondary Interlock Switch Interlock Monitor Switch Primary Interlock Switch Figure 22 a LATCH 0 1 64 Figure 22 b LATCH BOARD 0 1 64 LGE Internal Use Only CHECK THE DOOR LATCH A
20. ing 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 B Put a container filled with water about 1 liter into the oven and close the door tightly Set cooking time for 10 minutes by touching 1 and then O three times 1 0 0 0 appears in the display window Touch the START key Make sure the cavity light comes on The unit will begin cooking and the display window will show the time counting down by seconds 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 Touch the START key each time the door is closed Continue operating the unit Four long beep sound signal is heard when the time is up The unit will shut off automatically Confirm the water is hot Finally measure the output power according to POWER OUTPUT MEASUREMENT on page 7 3 LGE Internal Use Only 6 1 FEATURES AND SPECIFICATIONS FEATURES A The safety systems incorporated in this model are 1 Primary interlock switch 2 Secondary interlock switch 3 Interlock monitor switch 4 Choke system 5 Magnetron thermal fuse 6 Oven cavit
21. ining and service purposes CONTROL PANEL INSTRUCTIONS NOTE Styling and features vary by model 1 DISPLAY The Display includes a clock and indicators to tell you time of day cooking time settings and cooking functions selected 2 COOK Touch this pad to cook fresh vegetable frozen vegetable rice or casseroles 3 REHEAT Touch this pad to reheat dinner plate soup sauce casserole roll muffin 4 KIDS MEAL Selects type of dish to reheat hot dog baby food oat meal or soup 5 AUTO DEFROST Meat poultry fish Touch this pad to select food type and defrost food by weight 6 QUICK DEFROST This pad provides you with the RAPID defrosting method for 1 0 pound frozen foods 7 NUMBER Touch number pads to enter cooking time power level quantities or weights 8 MORE Touch this pad to add ten seconds of cooking time each time you press it 9 STOP CLEAR Touch this pad to stop the oven or clear all entries 10 VENT HI LOW OFF Touch this pad to turn the Vent on or off 11 TURNTABLE ON OFF Touch this pad to control the turntable on or off 12 HOT WATER Touch this pad when heating water in your microwave oven 13 POPCORN Touch this pad when popping popcorn in your microwave oven Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 4 2 14 15 16 17 18 19 20 21 22 23 24 MELT Touch this pad to melt butter or m
22. low 100 ohms a 3 RELAY 7 1 Measure continuity ohm meter scale Rx1 Power 2 Remove the lead wires and operate oven Level Open Close at power level 1 through power level 10 1 4 Sec 18 Sec 2 6 Sec 16 Sec 3 8 Sec 14 Sec 4 10 Sec 12 Sec 5 12 Sec 10 Sec 6 14 Sec 8 Sec 7 16 Sec 6 Sec 8 18 4 Sec 9 20 2 10 22 5 VENTILATION MOTOR 1 Remove wire leads Normal 2 Measure resistance ohm meter scale Rx1 High speed Approximately High speed Blue and Black wire 60 to 75 ohm Low speed Blue and White wire Low speed Approximately 110 to 125 ohm LGE Internal Use Only 7 16 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes COMPONENTS TURNTABLE MOTOR TEST PROCEDURES Remove wire leads 2 Measure resistance ohm meter scale Rx1000 RESULTS Normal Approximately 2 5 to 3 5 ohm Abnormal Infinite or several NOISE FILTER Unplug microwave oven disconnect power Remove wire Measure resistance ohmmeter scale Rx1 Normal N 1 N 2 coil Less than 1 ohm L 1 L 2 coil Less than 1 ohm Abnormal infinite Normal L 1 or L 2 N 1 or N 2 resistor 1 5M ohms Abnormal 0 ohms TOUCH KEY BOARD Measure the resistance between terminal pins of connector KEY CONNECTOR NOTE When reconnecting the FPC connecto
23. of 001 Voltage reading 0 Vdc rs a Defective Replace the RELAY 1 12 or poor circuit board connection of RELAY1 12 Replace RELAY1 12 or correct the connection Copyright 2007 LG Electronics Inc All right reserved 7 19 LGE Internal Use Only Only for training and service purposes 3 CHECKOUT PROCEDURES FOR CIRCUIT BOARD The following symptoms indicate a defective circuit board 1 The start function fails to operate but the high voltage Systems the interlock switches the door sensing and the relay check good The unit with a normal relay continuously operates Proper temperature measurement is not obtained The buzzer does not sound or continues to sound Some segments of one or more digits do not light up or they continue to light up or segments light when they should not 2 3 4 5 Wrong figures appear The figures of all digits Some of the indicators do no flicker light up 6 7 8 9 The clock does not keep time properly NOTE A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON LGE Internal Use Only 7 20 Only for training and service purposes Copyright 2007 LG Electronics Inc All right reserved 1 p1eoq
24. or 212 F 1 deg scale LGE Internal Use Only MEASURING MICROWAVE ENERGY LEAKAGE Pour 275x15cc of 20 5 C 68 9 F water in beaker which is graduated to 600 cc and place the beaker on the center of the turntable Set the energy leakage monitor to 2 450 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 M B B Pa Gg Probe scanning speed Less than 2 5 cm sec 1 in sec Copyright 2007 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 inl
25. ouble Half Wave Choke System Oven Cavity Thermostat Open at 90 C 5 C Fuse 20A Primary Interlock Switch Secondary Interlock Switch Interlock Monitor 2M214 161GP Capacitor 1 2 1 KV AC Diode 350mA 9 0 KV 125 30 W Digital up to 99 mim 99 sec in each cooking stage Tempered Safety Glass 2919 16 W x167 16 H x15 s D 2196 W x8 s D x14 s H 1 6 Cu ft Owner s Manual amp Cooking Guide Installation Manual Exhaust Adapter Exhaust Damper Mounting Kit and Two Filters Rotating Ring Assembly 1 1 LGE Internal Use Only 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 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 discharge 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 DO NOT touch any parts of the control panel circuit A resulting static electric discharge may damage this P C B NEVER operate
26. r make sure that the holes on the FPC connector are properly engaged with hooks on the plastic fastener MATRIX CIRCUIT FOR TOUCH KEY BOARD CONNECTOR KEY CON TOP AUTO CLEAR DEFROST HOT HOT BABY OAT POPCORN FOOD MEAL COOK SOUP LESS VENT Light T T HOLD TIME POWER QUICK Hi Low Oft J HilLow Oft J ON OFF 4 WARM J COOK LEVEL 4 DEFROST E S START CLOCK KITCHEN gz oN SOFTEN TIMER Ds When touched When not Resistance touched value than More than 400 ohms 1 mega ohm FPC CONNECTOR Top gt 1 Jj n 3 E 5 ae 9 10 P 11 l 13 NOTES e A MICROWAVE ENERGY TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON e MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION e WHEN REMOVING THE WIRE LEADS FROM THE PARTS BE SURE TO GRASP THE CONNECTOR NOT THE WIRES Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only B CHECKOUT PROCEDURES 1 CHECKOUT PROCEDURES FOR FUSE BLOWING CAUTION REPLACE BLOWN FUSE WITH 20 AMPERE FUSE PROBLEMS CAUSES Fuse blows immediately after the door is closed Improper operation of the primary interlock secondary Fuse blows immediately after interlock switches an
27. re 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 etc 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 type 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 2007 LG Electronics Inc All right reserved 3 1 LGE Internal Use Only Only for training and service purposes OPERATING INSTRUCTIONS CONTROL PANEL NOTE Styling and features vary by model Auto 2 COOK REHEAT POPCORN water 42 Kids Meal BABY SOUP HOT DOG OAT MEAL FOOD AUTO QUICK E DEFROST DEFROST SOFTEN MELT KITCHEN TIMER 46 HOLD WARM 7 POWER LEVEL STOP CLEAR TURNTABLE LIGHT HI LOW OFF ON OFF HI LOW OFF LGE Internal Use Only 4 1 Copyright 2007 LG Electronics Inc All right reserved Only for tra
28. rvice purposes EV CONTROLLER PARTS CWTP018 8 gt LGE Internal Use Only 8 2 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes EV OVEN CAVITY PARTS LGE Internal Use Only 8 3 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LATCH BOARD PARTS EV INTERIOR PARTS 1 LGE Internal Use Only 8 5 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes EV INTERIOR PARTS II Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 8 6 LGE Internal Use Only EV INSTALLATION PARTS INSTALLATION MANUAL Copyright 2007 LG Electronics Inc All right reserved LGE Internal Use Only Only for training and service purposes
29. s not included about 3 sec 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 of heat Where P is the microwave power output in watts Mw is the mass of the water in grams Mc is the mass of the container in grams 0 is the ambient temperature in C T1 is the initial temperature of the water in C T2 is the final temperature of the water in C tis the heating time in seconds excluding the magnetron filament heat up time WATER LOAD G TURNTABLE LGE Internal Use Only DISASSEMBLY INSTRUCTIONS IMPORTANT NOTES UNIT MUST BE DISCONNECTED FROM ELEC TRICAL OUTLET WHEN MAKING REPAIRS RE PLACEMENTS ADJUSTMENTS AND CONTIN UITY CHECKS WAIT AT LEAST ONE MINUTE UNTIL THE HIGH VOLTAGE CAPACITOR IN THE HIGH VOLTAGE POWER SUPPLY HAS FULLY DISCHARGED THE CAPACITOR SHOULD BE DISCHARGED BY USING INSULATED WIRE I E TEST PROBE CONNECTED TO 10K OHM RESISTOR IN SERIES TO GROUND 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 Remove a screw securing the control panel assembly to the oven cavity
30. tc 2 Remove two screws securing it to the door handle CAUTION Be careful not to damage door seal plate with the screwdriver Door Screen Figure 15 b LGE Internal Use Only H ASSEMBLING DOOR 1 When mounting the door assembly to the oven 3 Carefully pull the ventilation motor ASS Y out of the assembly be sure to adjust the door assembly microwave oven See Figure 18 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 Space LL M Figure 18 REMOVING THE VENTILATION FAN ASS Y 1 Remove the mounting plate by removing two screws securing it to the back plate See Figure 16 2 Remove the two screws securing the MOUNT ALL and one screw securing the ventilation fan ASS Y See Figure 17 Figure 16 Figure 18 a MOUNT ALL Figure 17 LGE Internal Use Only 7 10 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes J REMOVING THE TURNTABLE MOTOR NOTES 1 Remove the turntable Remove the leadwire from the turntable motor VERY 2 Remove the turntable shaft VERY CAREFULLY CAREFULLY with a slotted screwdriver Figure 19 Be sure to grasp the connector not the wires when 3 Remove the base plate by removing 6 screws removing securing it to t
31. tener C Connector Terminal socket Figure 5 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 7 5 HOW TO INSERT THE F P C CONNECTOR Follow the steps below as illustrated in Figures 6 and 7 to insert the F P C connector 1 Insert the F P C connector into the terminal Socket securely with the fingers 2 Hold the plastic fastener with thumb and forefinger of the other hand and push it slowly into the terminal socket Figure 6 NOTE When reconnecting the F P C connector make sure that the holes on the F P C connector are properly engaged with the hooks on the plastic fastener 3 Lock the level of the plastic fastener into the hook of the terminal socket securely by releasing the fingers Figure 7 Plastic fastener Connector Terminal socket Figure 6 Plastic fastener Connector Terminal socket Figure 7 LGE Internal Use Only B REMOVING THE OUT CASE Figure 8 1 Remove the vent grille by removing two screws securing it to the out case 2 Remove two screws securing it to the front bracket 3 Remove two screws securing it to the air duct 4 Remove the mounting plate by turning the two screws securing it to the out case 5 Remove the base plate by removing six screws securing it to the out case Remove the Mount All from the out case by removing two screws securing it to the out case and one screw securing it to the ventila
32. 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 Be sure that the magnetron gasket is properly installed around the dome of the tube whenever installing the magnetron ANTENNA Gasket COOLING FIN MAGNETRON CHASSIS GROUND FILAMENT TERMINALS MAGNETRON THE OVEN IS TO BE SERVICED ONLY BY PROPERLY QUALIFIED SERVICE PERSONNEL Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes INSTALLATIONS PRECAUTIONS ON INSTALLATION A Plug the power supply cord into a 120V AC 60Hz single phase power source with a capacity of 15A or 20A B Avoid placing the unit in a location where the
33. tion motor ASS Y and cavity Vent Grille 6 Remove the power cord cover from outcase by removing a screw 7 Remove the power cord to the inner of the out case with turning power cord and remove the out case with pushing it back Controller Figure 8 LGE Internal Use Only Copyright 2007 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 PROCEDURE on page 7 12 Latch Board Monitor Interlock Switch Figure 9 Copyright 2007 LG Electronics Inc All right reserved 7 7 Only for training and service purposes Latch Board Secondary Interlock Switch Interlock Monitor Switch Primary Interlock Switch Figure 10 LGE Internal Use Only D REMOVING MAGNETRON NOTES Figures 11 Through 13 When removing the magnetron make sure that its Remove vertgrille dome does not hit any adjacent parts or it may be Remove mount all 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 After replacing the magnetron check for microwave energy leakage with a survey meter
34. to the body of the switches in the following sequence Primary Interlock Switch Secondary Interlock Switch Interlock Monitor Switch Adjust the latch board until the switches operate in 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 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 7 When you achieve the proper sequence of switches in Steps 5 and 6 tighten the latch board screws at that point TEST THE MICROWAVE ENERGY LEAKAGE Make sure the microwave energy leakage is below the limit of 1mW cm with a 275 ml water load and 5mW cm with a 275 ml water load without the cabinet when measured with a survey meter 7 13 LGE Internal Use Only INTERLOCK CONTINUITY TEST A PRIMARY INTERLOCK SWITCH TEST B SECONDARY INTERLOCK SWITCH TEST When the door is opened slowly an audible click Disconnect the wire lead from the secondary should be heard at the same time or successively switch at interv
35. utput P in watts is calculated from the following formula Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 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 3 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 4 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 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 2 Should the microwave energy leakage not be more than 2 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 3 At least once a year have the electromagnetic energy leakage monitor checked for calibration by its manufacturer 4 187Mw T2 T1 0 55Mc T2 t is measured while the microwave generator is operating at full power Magnetron filament heat up time i
36. y 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 100W to 1000W can be selected by the touch control and electronic computer system Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes SERVICE INFORMATION PRECAUTIONS AND REPAIR SERVICE TIPS PRELIMINARY A SINCE NEARLY 2 100 VOLTS EXISTS IN SOME CIRCUITS OF THIS UNIT REPAIRS SHOULD BE CARRIED 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 opening and closing the door several by opening and closing the door several times b Make sure the perforated screen and the dielectric choke of the door are correctly and firmly mounted 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 le
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