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LG LMV1683SB Service Manual Download Page 10

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5-2. Key Matrix

KEY MATRIX

Summary of Contents for LMV1683SB

Page 1: ...RVICE MANUAL MODEL LMV1683ST LMV1683SB LMV1683SW CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL P NO MFL30474304 March 2012 Printed in Korea Website http biz lgservice com 삼 흥 정 판 Internal Use Only ...

Page 2: ... 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 ...

Page 3: ... 4 1 Control Panel Features 7 4 2 Explanation of Control Panel 8 5 Wiring Diagram Key Matrix 9 5 1 Wiring Diagram 9 5 2 Key Matrix 10 6 Troubleshooting 11 6 1 General Information for Service 11 6 2 Safety Caution 12 6 3 Basic Check Summary 13 6 4 Troubleshooting 14 7 Microwave Leakage Test 25 8 Power Output Measurement 27 9 Interlock System 28 9 1 Interlock Mechanism 28 9 2 Interlock Continuity Te...

Page 4: ...Magnetron 2M214 161GP Cook top Lamp 125 V 30 W or 40 W Cavity Lamp 125 V 30 W or 40 W Timer Digital up to 99 min 99 sec in each cooking stage Tray Tempered Safety Glass Overall Dimensions 2915 16 W x 167 16 H x 1615 16 D Oven Cavity Size 219 16 W x 141 8 H x 83 4 D Effective Capacity of Oven Cavity 1 6 Cu ft Accessories Owner s Manual Cooking Guide Installation Manual Exhaust Adapter Exhaust Dampe...

Page 5: ...ng operation BEFORE TOUCHING any parts of the oven always remove the power plug from the outlet 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 the oven with no load NEVER injure the door seal and front plate of the oven cavity NEVER put iron tools ...

Page 6: ...io 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 hol...

Page 7: ... 7 4 OPERATION 4 1 Control Panel 2 4 11 10 3 1 8 12 9 15 18 19 17 14 20 13 16 7 6 5 ...

Page 8: ... this pad to melt butter or margarine chocolate cheese marshmallow 10 AUTO DEFROST Meat poultry fish Touch this pad to select food type and defrost food by weight 11 TIME DEFROST This pad provides you with the RAPID defrosting method for 1 0 pound frozen foods 12 TIME Touch this pad to set a cooking time 13 CLOCK Touch this pad to enter the time of day 14 POWER LEVEL Touch this pad to select a coo...

Page 9: ... 9 5 WIRING DIAGRAM KEY MATRIX 5 1 Wiring Diagram ...

Page 10: ... 10 5 2 Key Matrix KEY MATRIX ...

Page 11: ... window will show the time counting down by seconds D After about 5 minutes make sure the primary interlock switch the secondary interlock switch and the interlock monitor switch operate properly by opening and closing the door several times Touch the START key each time the door is closed E Continue operating the unit Two short and a long beep sound signal is heard when the time is up The unit wi...

Page 12: ...imit of 5 mW cm2 All service adjustments should be made for minimum microwave energy leakage readings 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 ...

Page 13: ...en the door is closed Switch Symptom 2 Door is open Operating F M S M T T M automatically Check Open Short when the door is open Switch Symptom 1 Door is closed No key Not start Operating O L F M S M T T M Check Open Short when the door is closed Switch Symptom 2 Door is open Not turn on O L Check Open Short when the door is open Switch ...

Page 14: ... 14 6 4 Troubleshooting No Display or Dead ...

Page 15: ...code and connector Code L to Pin1 Code N to Pin3 No Yes Check PCB Go to No 6 of This flow chart Go to No 6 of this flow chart Is there any beep sound in continuity test between the ends of fuse Yes No Replace the Fuse 5 Is there any beep sound in continuity test between the ends of the noise filter Yes No Replace the Noise filter L L L L L L L L L L L L L L L L L L L L L N N N N N N N N N N N N N ...

Page 16: ... 16 Keypad Failure ...

Page 17: ...ch Door should be closed Power ON Yes No Adjust latch board Refer to 9 1 9 2 Check PWB Go to No 5 of this flow chart 3 When the door is opened is the voltage of door sensing part over 4 V CN3 Pin1 and Pin2 Yes No Replace the PCB EBR67471707 Reconnect or repair the connector Replace the PCB EBR67471707 4 Is the connector connected to PCB disconnected or disassembled No Yes Replace the keypad No ...

Page 18: ... 18 No Heat No Cook ...

Page 19: ...AB2 No Yes PCB no problem Alternate with explanation Refer to the Note 3 While the product is operating under EZ ON start is the voltage of both ends of the D32 over 8 V No Yes Replace the Relay 2 4 Replace the PCB EBR67471707 Note If something is caught in the door or in the sealing area the microwave oven cannot operate safely The latch switches and monitor switch will prevent operation ...

Page 20: ...fer to 9 1 9 2 7 Is the resistance of high voltage Transformer out of rage Test Point 1 Primary winding 0 2 0 5 Ohm 2 Secondary 50 120 Ohm 3 Filament winding 0 Ohm No Yes Replace the High Voltage Transformer 6 Is the connector connected to High Voltage Transformer assembly disconnected or disassembled No Yes Reconnect or repair the connector ...

Page 21: ...igh voltage diode assembly disconnected or disassembled No Yes Reconnect or repair the connector 12 Is the connector connected to the magnetron assembly disconnected or disassembled Yes 11 Is the resistance of the high voltage diode out of rage Refer to 10 Yes No Replace the high voltage Diode Reconnect or repair the connector Forward Forward Forward Forward Forward Forward Forward Forward Forward...

Page 22: ... Yes Adjust the Primary latch board Refer to 9 1 9 2 Replace the turntable motor Power ON 3 Push the EZ ON Operate Is the voltage of both ends of the D31 over 8 V Yes No Replace the PCB EBR67471707 4 Is there any beep sound in continuity test between the ends of two Pin of RY1 Yes No Replace the PCB EBR67471707 5 PCB No Problem ...

Page 23: ...otor 2 Is there any beep sound in continuity test between the ends of latch board Secondary switch Door should be closed Yes No Adjust latch board Refer to 9 1 9 2 Power ON 4 When the door is opened Is the voltage of door sensing part over 4 V Pin 11 to Pin 12 Yes No Replace the PCB EBR67471707 4 Is there any beep sound in continuity test between the ends of two Pin of RY1 No Yes 5 Is the voltage ...

Page 24: ...servicing The power density of the microwave radiation leakage emitted by the microwave oven should not exceed 1mW cm2 sq And always start measuring of an unknown field to assure safety for operating personnel from radiation leakage NOTE The standard is 5mW cm2 sq while in the customer s home 1mW cm2 sq stated here is manufacturer s own voluntary standard for units in customer s home EQUIPMENT TES...

Page 25: ... 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...

Page 26: ... K is measured where t is the time in seconds and T 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 output P in watts is calculated from the following formula 4 187 Mw T2 T1 0 55Mc T2 T0 t is measured while the microwave generator is operating at...

Page 27: ...is removed 1 Set the microwave oven on its side so that you can see the latch board and the switches as shown inFigure 23 a 2 Close the door tightly and check gaps A and B to be sure they are no more than 1 64 0 5 mm See Figure 23 b for close up view of gaps 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 th...

Page 28: ... 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 7 When you achieve th...

Page 29: ... indicate an closed circuit When the secondary switch operation is abnormal make the necessary adjustment or replace the switch only with the same type of switch C MONITOR SWITCH TEST Disconnect the wire lead from the monitor switch Connect the ohmmeter leads to the common COM and normally closed NC terminals of the switch The meter should indicate closed circuit in the door open condition When th...

Page 30: ... wire leads 2 Measure resistance ohm meter scale Rx1 Primary winding Secondary winding Filament winding 3 Measure resistance ohm meter scale Rx1000 Primary winding to ground Filament winding to ground 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 Filament terminal 3 Measure resistance ohm met...

Page 31: ...dicate infinite resistance in both directions 1 Measure continuity ohm meter scale Rx1 2 Remove the lead wires and operate oven at power level 1 through power level 10 RELAY 2 1 Remove lead wires 2 Measure resistance ohm meter scale Rx1 High speed Blue and Black wire Low speed Blue and White wire Slow speed Blue and Grey wire Normal High speed Approximately 60 to 75 ohm Low speed Approximately 110...

Page 32: ...il Lessthan 1 ohm N 1 N 2 coil Lessthan 1 ohm Abnormal infinite Normal L 1 or L 2 N 1 or N 2 resistor 1 5M ohms Abnormal 0 ohms 1 Remove wire leads 2 Measure resistance ohm meter scale Rx1000 1 Unplug microwaveoven or disconnect power 2 Removewire 3 Measureresistance ohmmeter scale Rx1 TURNTABLE MOTOR NOISE FILTER ...

Page 33: ...ner MATRIX CIRCUIT FOR TOUCH KEY BOARD CONNECTOR KEY CON TOUCH KEY BOARD Resistance value When touched Less than 400 ohms When not touched More than 1 megohm FPC CONNECTOR Top 1 2 4 5 3 10 7 9 8 12 11 6 NOTES A MICROWAVE ENERGY TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION WHEN REMOVING THE WIRE LEADS FROM THE PARTS BE S...

Page 34: ...NG POWER AND CONTROL CIRCUIT BOARD Figures 1 2 and 3 1 Remove a screw securing the control panel assembly to the oven cavity 2 Remove the control panel with pushing it upward 3 Remove the connectors CN1 and wire leads RY7 from the circuit board 4 Remove 5 screws securing the circuit board Relay 7 White Relay 2 CN1 Circuit Board Control Bracket Connector S1 Relay 7 Circuit Board 5 Remove the FPC co...

Page 35: ...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 pro...

Page 36: ...the mounting plate by turning the screws 1 or 2 screws securing it to the outer case 4 Remove two screws on the left central edge and one screw on the right central edge of the base plate Remove the fan bracket from the out case by removing one screw securing it to the outer case 5 Remove six screws of the rear cavity 6 Remove the outcase Fan Bracket Power Cord Figure 8 ...

Page 37: ... switches 2 Remove two screws securing the Latch Board 3 Make necessary replacements and check microwave energy leakage according to ADJUSTMENT PROCEDURES on page 7 12 Figure 9 Figure 10 WIRE COLOR SYMBOL COLOR WH WHITE BK BLACK BR BROWN RD RED YL YELLOW PK PINK BL BLUE GY GREY GN GREEN N P Not Provided ...

Page 38: ...e 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 Check microwave energy leakage must be below the limit of 5 mW cm2 All service adjustments should be made for minimum microwave energy leakage readings E REMOVING STIRRER FAN Figures 13 and ...

Page 39: ... etc 2 Remove two screws securing it to the door handle CAUTION Be careful not to damage door seal plate with the screwdriver H ASSEMBLING DOOR 1 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 assemblyIf the door assembly is not mounted properly microw...

Page 40: ...a hand Figure 19 3 Remove the base plate by removing 8 screws securing it to the oven cavity Figure 20 4 Disconnect the leadwire from the turntable motor terminals 5 Remove the 1 screw securing the turntable motor to the oven cavity assembly Figure 21 NOTES Remove the leadwire from the turntable motor VERY CAREFULLY Be sure to grasp the connector not the wires when removing Figure 18 b Figure 19 F...

Page 41: ... 41 12 EXPLODED VIEW INTRODUCTION CONTROL PANEL PARTS DOOR PARTS OVEN CAVITY PARTS INTERIOR PARTS LATCH BOARD PARTS EV Customer Model Product Code SVC Model ...

Page 42: ... 43 DOOR PARTS II 1005 1000 1002 1004 1006 1007 1008 1381 W262 1009 EV Customer Model Product Code SVC Model ...

Page 43: ... 45 2004 2381 2008 2006 W102 2018 EV Customer Model Product Code SVC Model CONTROLLER PARTS II ...

Page 44: ... 46 OVEN CAVITY PARTS 3034 3010 3001 3029 5038 6001 6000 3011 3025 3026 3028 3018 3036 3024 3038 For Model For Model EV ...

Page 45: ... 47 LATCH BOARD PARTS 4001 W102 4000 4002 4003 4002 4004 EV ...

Page 46: ... 48 INTERIOR PARTS I 5008 5035 W101 5016 5034 5000 5002 5018 W101 3009 3008 3012 3002 3037 5014 W101 5009 EV ...

Page 47: ... 49 INTERIOR PARTS II 5024 3027 3028 5045 5037 5038 5010 5001 W101 5058 5044 3004 5043 5337 5006 5041 5118 EV ...

Page 48: ... 50 INSTALLATION PARTS 6008 6011 6010 VINYL BAG 6009 EV ...

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