LG SolarDOM MP9485FR, Service Manual

Page 1: ...arDOM SERVICE MANUAL MODEL MP9485FR CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL Website http biz lgservice com P NO MFL62270002 March 2010 Printed in Korea 삼 흥 정 판 Internal Use Only ...

Page 2: ... 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 ...

Page 3: ...ICE INFORMATION 5 1 TOOLS AND MEASURING INSTRUMENTS 5 1 MICROWAVE LEAKAGE TEST 5 1 MEASUREMENT OF MICROWAVE POWER OUTPUT 5 3 DISASSEMBLY AND ADJUSTMENT 5 3 UPPER LOWER HEATER 5 7 INTERLOCK CONTINUITY TEST 5 8 COMPONENT TEST PROCEDURE 5 9 TROUBLE SHOOTING 5 14 EXPLODED VIEW 6 1 REPLACEMENT PARTS LIST 7 1 CONTENTS LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for tr...

Page 4: ...0 W x 204 H x 420 D mm 26 kg 29 kg 1 Microwave Power level 3 Convection 40 C 100 250 C max 900 W 600 W 360 W 180 W 90 W 4 SPEED COMBI 2 GRILL 5 SPEED AUTO COOK Owner s manual Cook book High rack Low rack Metal tray Rotisserie Display Heater Microwave power selection Co 1 Grill 1 180W 360W 600W Co 2 Grill 2 180W 360W 600W Co 3 Grill 3 180W 360W 600W Co 4 Upper heater 1550W Lower heater Microwave po...

Page 5: ...te 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 2 1 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 THE OVEN IS TO BE SERVICED ONLY BY PROPERLY Q...

Page 6: ...ction and Combination mode This glass is very hot during heater operating 9 Do not operate the oven at microwave and combination mode with Grill rack placed in the cavity when the oven is empty EARTHING INSTRUCTIONS This oven is designed to be used in a fully earthed condition It is imperative therefore to make sure it is properly earthed before servicing WARNING THIS APPLIANCE MUST BE EARTHED IMP...

Page 7: ...While cooking with auto and manual function you can set or change the cooking time at any point by turning the dial knob except defrost mode 7 Display Window You can show time of day cooking time power level and cooking categories 8 Enter You can determine the selected cooking category microwave power level or temperature 9 Defrost You can select the food type and the weight of the food 10 Micro Y...

Page 8: ...king time Start Enter Stop Clear Convection Enter Desired cooking time Start Turn Dial Desired convection temp 40 C 100 C 250 C Stop Clear Defrost Turn Dial Desired defrost category Food weight Start Enter Stop Clear Function Speed Combi Turn Dial Desired speed Combi category Food weight Start Stop Clear Stop Clear Touch and Hold Stop Clear Stop Clear Touch and Hold Stop Clear Start Quick Start St...

Page 9: ...SCHEMATIC DIAGRAM 4 3 LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...

Page 10: ...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 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 ...

Page 11: ... 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 5cm 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 surfac...

Page 12: ... 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 is moved horizontally along the oven surface this may possibly cause probe damage...

Page 13: ...owing formula 4187 X T 0 55 X T2 T0 X M T T2 Temperature after heating T0 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 Stirring devices and measuring instruments are selected in...

Page 14: ... oven F BRACKET ASSEMBLY REMOVAL 1 Remove screws on the bracket assembly and release a lug 2 Disconnect the leadwire from thermostat and lift out the bracket assembly G MAGNETRON REMOVAL 1 Remove controller assembly and bracket assembly 2 Disconnect the leadwire from the high voltage transformer and Magnetron 3 Carefully remove the mounting screws holding the magnetron and the wave guide 4 Remove ...

Page 15: ...ble shaft VERY CAREFULLY 3 Lay the unit down on its back 4 Remove the turntable motor cover The turntable base cover is easily removed by pinching the six parts with a wire cutting 5 Disconnect the leadwire from the turntable motor terminals 6 Remove the screw securing the turntable motor to the oven cavity assembly 7 After repairing the motor rotate the removed turntable motor cover 8 Fit the tur...

Page 16: ...ERLOCK SYSTEM 1 INTERLOCK MECHANISM The door lock mechanism is a device which has been specially designed to eliminate 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 3 INSTALLATION AND ADJUSTMENT OF THE LATCH BOARD TO THE OVEN ASSEMBLY Mount the lat...

Page 17: ...p 4 Remove the heater holder 5 Remove the reflector and glass pieces If the hologen heater isn t broken 1 Remove the heater holder and halogen heater O LOWER HEATER REMOVAL 1 Disconnect the leadwire from the sheath heater 2 Remove the base plate from cavity 3 Remove the nuts from the oven cavity of the side 4 Remove the gasket ring and heater bracket 5 Remove the sheath heater in the oven cavity C...

Page 18: ...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 closed circuit in the door open condition When the door is closed meter should indicat...

Page 19: ...TRON Wire leads removed 1 Measure the resistance Ohm meter scale Rx1 and Rx100 Primary winding Secondary winding Filament winding 2 Measure the resistance Ohm meter scale Rx1000 Primary winding to ground Filament winding to ground 1 Measure the resistance Ohm meter scale Rx1 Filament terminal 2 Measure the resistance Ohm meter scale Rx1000 Filament to chassis Approx 1 7 ohm Approx 130 ohm Less tha...

Page 20: ...er scale Rx10000 Measure the continuity Reverse Ohm meter scale Rx10000 Normal Momentarily indicates several ohms and then gradually returns to infinite Normal Infinite Normal Continuity Abnormal Infinite Normal Infinite Abnormal Continuity 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 Antenna Gasket...

Page 21: ...normal HEATER ELEMENT Wire leads removed Measure the resistance Multi meter scale Rx1 Measure the resistance with 500V 100M ohm insulation resistance meter NOTE Make sure heater is fully cooled when tested Normal Upper sheath heater Approx 47 ohm 230V 1100W Lower sheath heater Approx 74 ohm 230V 700W Upper Halogen heater Approx 15 ohm 230V 450W at 20 30 C MAGNETRON and OVEN THERMOSTAT OVEN Thermos...

Page 22: ...lay 5 Up sheath heater Relay 6 Lo sheath heater Relay 7 Halogen Heater FAN MOTOR Wire leads removed TURNTABLE MOTOR Wire leads removed Measure the resistance Ohm meter scale R x 1 Check for P C B connector Measure the resistance Ohm meter scale R x 1000 Normal Approx 60 ohm Abnormal Infinite or several ohm Normal Approx 10 20 kohm Abnormal Infinite or several ohm Cooking Start OFF Cooking Start OF...

Page 23: ...gnment of the respective pads on the key board is as shown left figures NOTE A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE 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 1 2 3 4 5 6 7 8 9 10 18 1 2 3 4 5 6 7 8 9 10 18 Key P C B Main P C B LGE Internal Use Only ...

Page 24: ...in your body CONDITION The oven does not work Inserting many plug into one plug outlet and using them at the same time causes overloading The oven plug is not inserted tightly Output power is too low Low AC input voltage Food temperature is too low Using metallic ware and allowing it to touch the oven wall Sparks occurring Inconsistent intensity of microwave by their characteristics 1 Wrap the thi...

Page 25: ...E 1 The following visual conditions indicate a probable defective control circuit 1 Incomplete segments Segment missing Partial segment missing Digit flickering NOTE Slight flickering is normal 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 blinkin...

Page 26: ...gnetron thermostat No continuity 1 Fuse blows Continuity Malfunction of the monitor switch Replace primary and monitor switches Check continuity of monitor switch with door closed Check continuity of primary switch with door opened No continuity Disconnect one side of the wire lead connected from transformer to the high voltage capacitor and operate the unit No continuity Continuity Shorted contac...

Page 27: ... assembly Loose connection Connection then tightly Output is low Lower than 90 of rating voltage Normal Decrease in power source voltage with load Suggest customer contact local electric power utility co or qualified electrician Check the power source voltage Disconnect the wire leads from relay 4 and check on and off time with multitester Abnormal Normal Abnormal Defective magnetron Replace magne...

Page 28: ...ormer and H V Fuse Check H V transformer and H V Fuse Abnormal Defective high voltage capacitor Replace high voltage capacitor Check H V capacitor Abnormal Defective high voltage Diode Replace high voltage Diode Check H V diode normal Abnormal Defective magnetron Replace magnetron Check Magnetron normal TROUBLE 5 No microwave oscillation even though oven lamp and fan motor run Display operates pro...

Page 29: ...ng 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 1 Heater is not operating Abnormal Normal Malfunction of the heater Replace Heater Abnormal Normal Malfunction of the thermostat and relay 5 6 7 Replace Thermostat and relay 5 6 7 2 Lower tempera ture the oven Ab...

Page 30: ...DOOR PARTS CONTROL PANEL PARTS BASE PLATE PARTS OVEN CAVITY PARTS LATCH BOARD PARTS INTERIOR PARTS MAY000 MFL552 OWNERS MANUAL MAX171 COOK BOOK 6 1 EXPLODED VIEW INTRODUCTION EV MODEL ...

Page 31: ... 6 2 13581A 14891A 13213E 13552A 13650A WTP002 WTT051 14980A 14970A 140261 WPZ016 14970A 140262 WPZ016 DOOR PARTS EV ...

Page 32: ... 6 3 24781S 268711 WTT028 WTP004 WTP004 24810L 24810R 24980A 249401 250201 23551A 268712 WTT028 250201 CONTROL PANEL PARTS EV ...

Page 33: ...5 353001 WTT028 WTT022 WTT021 63303A WTT028 647781 WTT028 647781 54790A 348101 343501 WNZ015 368771 95001A 35026G 33301L 33301R 35026C 34270A 34271A 33650T 34960R WTP013 34810R 34370Z 34681R 36549R WSZ094 33390M 34370T 33052M WSZ092 34930R OVEN CAVITY PARTS EV ...

Page 34: ... 6 5 466001 43501L 43500L 44510A 466003 466001 43500R 43501R WSZ085 WSZ085 LATCH BOARD PARTS EV ...

Page 35: ... 6 6 35300H 348102 33034A WTT021 350122 56324A WSZ002 55264A WTT028 WSZ085 53550L 56912B WTT028 34890C 353002 WSZ085 552651 WTT021 WTT021 552652 948502 INTERIOR PARTS I EV ...

Page 36: ...1 56411A WSZ002 56549F WSZ002 WTT021 WTP002 56170D 948501 350121 33660A WMP021 56930M 50CZZH 56201A 56901A 54980A 55900A WWP008 WNH003 WWS005 36549W WTP002 56930V 568771 56322A 54810C 50FZZA WSZ002 56851D WSZ002 WNH002 WTT028 INTERIOR PARTS II EV ...

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