LG MS-269T Service Manual Download Page 37

Page: 37 / 44

7-2

LOC.

73720D

3720W1D102B

PANEL,DOORR

73740A

3740W1A008A

PROTECTOR (MECH)

73808A

3550W1A120A

COVER,BACK

743501

4350W1A015A

RING

74830A

4830W1A001A

BUSHING

749321

4932W1A001A

CONNECTOR (MECH)

749322

4932W1A001B

CONNECTOR (MECH)

74970A

4970W1A008B

SPRING

75026C

5026W1A049A

SHELF

75026G

5026W1A046A

SHELF

75264A

5264W1A020A

AIR TUNNEL

753001

5300W1D001D

HEATER,PLATE

753002

5300W1D001C

HEATER,PLATE

768771

6877W1A370B

HARNESS

76930V

6930WRT003B

THERMOSTAT

6930W1A002B

948503

3B72246S

CUSHION

WSZ002

1SBF0402418

SCREW TAP TITE(B),PAN HEAD

WSZ085

4B70188C

SCREW,DRAWING

WTP004

1TPL0302418

SCREW TAPPING,PAN HEAD

WTP013

1TPL0402418

SCREW TAPPING,PAN HEAD

WTT010

1TTL0402422

SCREW TAPPING,TRUSS HEAD

WTT021

1TTL0402418

SCREW TAPPING,TRUSS HEAD

WTT028

1TTL0402818

SCREW TAPPING,TRUSS HEAD

WTT037

1TTL0403818

SCREW TAPPING,TRUSS HEAD

PART NO.

DESCRIPTION

SVC ALTER

R : SERVICE PARTS

NO.

Summary of Contents for MS-269T

Page 1: ...MICROWAVE OVEN SERVICE MANUAL MODEL MS 269T TS CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL Website http www lgservice com ...

Page 2: ...r 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...

Page 3: ... CIRCUIT DESCRIPTION 4 4 SERVICE 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 INTERLOCK CONTINUITY TEST 5 7 COMPONENT TEST PROCEDURE 5 8 TROUBLE SHOOTING 5 12 EXPLODED VIEW 6 1 REPLACEMENT PARTS LIST 7 1 SCHEMATIC DIAGRAM OF P C B 8 1 PRINTED CIRCUIT BOARD 8 2 P C B PARTS LIST 9 1 CONTENTS ...

Page 4: ...7 D mm 16 5 kg approx 18 kg approx Microwave Power for Variable Cooking Power level MAX Full power throughout the cooking time MED HIGH approx 80 of Full power MEDIUM approx 60 of Full power DEFROST approx 40 of Full power LOW WARM approx 20 of Full power TOAST COMBI Owner s manual Glass turntable Rotating ring 1 1 ITEM MODEL Power Requirement Power Output Microwave Frequency Magnetron Timer Outsi...

Page 5: ...tron 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 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 du...

Page 6: ...to prevent interference 8 Do not touch the front glass during or after cooking of the Grill 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 microwave oven is designed to be used in a fully earthed condition It is imperative therefore...

Page 7: ...desired time 2 CLOCK Used to set the time of day 3 POWER Used to select the desired power level for cooking 4 AUTO COOK Used to cook the foods listed by one touch 5 AUTO DEFROST Used to select the auto weight defrost 6 STOP CLEAR Used to stop over and clear all entries except time of day 7 START One tap allows over to begin functioning 8 TOAST START STOP Start or stop for toast 9 TOAST COOK TIME U...

Page 8: ...ock 3 QUICK START 4 MICROWAVE COOKING 5 TOAST 6 TWO STAGE COOKING 7 AUTO WEIGHT DEFROST 8 AUTO COOK 9 CHILD LOCK This oven has a CHILD LOCK feature TO SET CHILD LOCK Touch the pad Touch STOP pad L appear in the display TO CANCEL CHILD LOCK Touch the pad touch STOP pad L disappears Stop Clock Set the hour Set the minute Start Stop Start STOP Start Stop Desired defrost category Desired cooking time ...

Page 9: ...SCHEMATIC DIAGRAM 4 3 ...

Page 10: ...0 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 3 by the applied signal to vary the average output power of microwave oven as POWER LEVEL refer to page 1 1 One complete cycle of relay 3 is 22 seconds WHEN THE DOOR IS OPENED DURING COOKING Both the primary switch and relay 3 are cut off pr...

Page 11: ...ich 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 5cm spacer supplied with the probe Operate the oven at its maximum output Measure the microwave radiation using and electromagnetic radi...

Page 12: ...e 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 t...

Page 13: ...ture is 5 K The microwave power output P in watts is calculated from the following formula 4187 x T 0 55 X T2 T0 X M T is measured while the microwave generator is operating at full power Magnetron filament heat up time is not included about 3 sec The water is stirred to equalize temperature throughout the vessel prior to measuring the final water temperature Stirring devices and measuring instrum...

Page 14: ...ORMER REMOVAL 1 Discharge the high voltage capacitor 2 Disconnect the leadwire from magnetron high voltage transformer and capacitor 3 Remove the screw holding the high voltage transformer to the baseplate F FAN MOTOR ASSEMBLY REMOVAL 1 Discharge the high voltage capacitor 2 Disconnect the leadwire from fan motor noise filter and high voltage capacitor 3 Remove the two screws holding the the sucti...

Page 15: ...5 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 J REMOVING THE TURNTABLE MOTOR 1 Remove the turntable 2 Remove the turntable shaft VERY CAREFULLY with a slotted screwdriver 3 Lay the unit down on its back 4 Remove the turntable motor cover...

Page 16: ...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 Check for play in the door by pushing the door release button Door movement should be less than 0 5 mm 1 64 inch Don t push the door release button while making a...

Page 17: ...osed meter should indicate an closed circuit When the secondary switch operation is abnormal make the necessary adjustment or replace the switch only with the same type of switch C MONITOR SWITCH TEST Disconnect the wire lead from the monitor switch Connect the ohmmeter leads to the common COM and normally closed NC terminals of the switch The meter should indicate closed circuit in the door open ...

Page 18: ... RESULTS HIGH VOLTAGE TRANSFORMER Wire leads removed MAGNETRON 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 ...

Page 19: ... Terminal to case Measure the continuity Forward Ohm meter 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 ...

Page 20: ...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 NOTE Make sure heater is fully cooled when tested Measure the resistance Multi meter scale Rx1 Normal Toast heater Approx 95 ohm at 20 30o C Normal more than 0 5 Mohm Normal Abnormal Measure the resistance with 500V 1...

Page 21: ...he resistance Ohm meter scale R x 1 Measure the resistance Ohm meter scale R x 1000 Normal Approx 200 400 ohm Abnormal Infinite or several ohm Normal Approx 10 20 kohm Abnormal Infinite or several ohm NOTE A MICROWAVE LEAKAGE 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 SUR...

Page 22: ...el to discharge any static charge built up in your body CONDITION Microwave oven does not work Inserting many plug into one plug outlet and using them at the same time causes overloading Microwave 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 intensi...

Page 23: ...ing cooking cycle 11 Display time of day does not reappear when cooking is finished 12 Beep sound is not heard when correct key is touched 5 13 TROUBLE 1 The following visual conditions indicate a probable defective control circuit CONDITION CHECK RESULT CAUSE REMEDY 1 No input can be programmed Continuity No continuity Defective PCB assembly Loose connection Replace PCB assembly Connect them tigh...

Page 24: ...ch with door closed Check continuity of primary switch with door opened Disconnect one side of the wire lead connected from transformer to the high voltage capacitor and operate the unit Replace fuse TROUBLE 2 Oven does not operate at all Display window does not display any figures and no input is accepted NOTE All these switches must be replaced at the same time Refer to page 5 6 5 7 2 Fuse does ...

Page 25: ...uity of secondary switch with door closed Check fan motor Check oven lamp Abnormal Abnormal Normal Defective fan motor Defective fan motor Replace fan motor Replace fan motor Loose connection Connection then tightly CONDITION CHECK RESULT CAUSE REMEDY Output is low Lower than 90 of rating voltage Normal Normal Abnormal Abnormal Measure the output power Disconnect the wire leads from relay 3 and ch...

Page 26: ...l Defective high voltage transformer Replace high voltage transformer Check H V transformer normal normal Abnormal Defective high voltage Diode Replace high voltage Diode Check H V diode Abnormal Defective high voltage capacitor Replace high voltage capacitor Check H V capacitor Abnormal Defective magnetron Replace magnetron Check Magnetron TROUBLE 5 No microwave oscillation even though oven lamp ...

Page 27: ...ction the heater Replace Replace 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 you set lower power level Abnormal Disconnect the wire leads from relay 3 and check continuity relay 3 Operate the unit Defective P C B assembly Replace P C B assembly NOTE Make sure the wore leads correct p...

Page 28: ...INTERIOR PARTS OVEN CAVITY PARTS DOOR PARTS TOAST PARTS BASE PLATE PARTS LATCH BOARD PARTS CONTROL PANEL PARTS 6 1 EXPLODED VIEW INTRODUCTION ...

Page 29: ...6 2 13720D 13213A 14026A 13552A 15006A 13536A 14970A 13581A WTT028 13650A DOOR PARTS ...

Page 30: ...6 3 383EW1 CONTROL PANEL PARTS ...

Page 31: ...6 4 33052A 33112U WTT010 948503 WTT021 WTP013 36549S 33390G 34370T 35889A OVEN CAVITY PARTS ...

Page 32: ...6 5 WSZ085 56912B 55262A 44510A 466001 43500A 43501A 466003 466001 LATCH BOARD PARTS ...

Page 33: ...6 6 568771 WSZ002 WSZ002 WTT028 56411A 56930V 56549F 54974S WTT037 55900A 268711 56324A 54810C WTT028 50CZZH 50FZZA WSZ002 WSZ002 56851C 56201A WTP004 INTERIOR PARTS ...

Page 34: ...6 7 WTT021 63302A 63303A 56170D WSZ002 WTT028 WSZ002 647781 65006A BASE PLATE PARTS ...

Page 35: ... 8 743501 73720D 73212A 73352A 73550D 73550H 73390M 73740A 73552A 73572A 74830A 73550A 74970A 73808A 74830A 73300A 75264A 75026C 76930V 768771 753002 753001 73446A 74970A 749322 749321 75026G TOAST PARTS ...

Page 36: ...ICRO R 3B73361D 50CZZH 6120W3H003J CAPACITOR DRAWING HIGH VOLTAGE R 0CZZW1H004C 50FZZA 3B70856T FUSE DRAWING R 54810C 4810W3C004A BRACKET CAPACITOR R 54974S 4974W1S057A GUIDE SUCTION R 55262A 5208W1A009A DUCT R 55900A 2B72125A FAN R 56170D 6170W1D029C TRANSFORMER HIGH VOLTAGE R 56201A 6201W2A018F FILTER ASSEMBLY CIRC R 56324A 2B71732B MAGNETRON R 56411A 6411W2C002A POWER CORD ASSEMBLY R 56549F 654...

Page 37: ...300W1D001D HEATER PLATE R 753002 5300W1D001C HEATER PLATE R 768771 6877W1A370B HARNESS R 76930V 6930WRT003B THERMOSTAT R 6930W1A002B 948503 3B72246S CUSHION R WSZ002 1SBF0402418 SCREW TAP TITE B PAN HEAD R WSZ085 4B70188C SCREW DRAWING R WTP004 1TPL0302418 SCREW TAPPING PAN HEAD R WTP013 1TPL0402418 SCREW TAPPING PAN HEAD R WTT010 1TTL0402422 SCREW TAPPING TRUSS HEAD R WTT021 1TTL0402418 SCREW TAP...

Page 38: ...003J CAPACITOR DRAWING HIGH VOLTAGE R 0CZZW1H004C 50FZZA 3B70856T FUSE DRAWING R 54810C 4810W3C004A BRACKET CAPACITOR R 54974S 4974W1S057A GUIDE SUCTION R 55262A 5208W1A009A DUCT R 55900A 2B72125A FAN R 56170D 6170W1D029C TRANSFORMER HIGH VOLTAGE R 56201A 6201W2A018F FILTER ASSEMBLY CIRC R 56324A 2B71732B MAGNETRON R 56411A 6411W2C002A POWER CORD ASSEMBLY R 56549F 6549W1F005A MOTOR CIRC FAN R 5685...

Page 39: ...300W1D001D HEATER PLATE R 753002 5300W1D001C HEATER PLATE R 768771 6877W1A370B HARNESS R 76930V 6930WRT003B THERMOSTAT R 6930W1A002B 948503 3B72246S CUSHION R WSZ002 1SBF0402418 SCREW TAP TITE B PAN HEAD R WSZ085 4B70188C SCREW DRAWING R WTP004 1TPL0302418 SCREW TAPPING PAN HEAD R WTP013 1TPL0402418 SCREW TAPPING PAN HEAD R WTT010 1TTG0402422 SCREW TAPPING TRUSS HEAD R WTT021 1TTL0402418 SCREW TAP...

Page 40: ...8 1 SCHEMATIC DIAGRAM OF P C B ...

Page 41: ...8 2 PRINTED CIRCUIT BOARD KEY P C B MAIN P C B ...

Page 42: ...209AA DIODE RECTIFIERS 1N4002 PYUNG CHANG TP26 DO41 100V 1A 30A R D08 0DD400209AA DIODE RECTIFIERS 1N4002 PYUNG CHANG TP26 DO41 100V 1A 30A R D09 0DD400209AA DIODE RECTIFIERS 1N4002 PYUNG CHANG TP26 DO41 100V 1A 30A R D30 0DD414809AB DIODE SWITCHING 1N4148M PYUNG CHANG TP26 DO34 60V 0 5A 0 R D31 0DD414809AB DIODE SWITCHING 1N4148M PYUNG CHANG TP26 DO34 60V 0 5A 0 R D32 0DD414809AB DIODE SWITCHING ...

Page 43: ...D1001F608 RESISTOR FIXED CARBON FILM 1K OHM 1 6 W 5 TA26 R R81 0RD1001F608 RESISTOR FIXED CARBON FILM 1K OHM 1 6 W 5 TA26 R R82 0RD1503F608 RESISTOR FIXED CARBON FILM 150K OHM 1 6 W 5 TA26 R R83 0RD1503F608 RESISTOR FIXED CARBON FILM 150K OHM 1 6 W 5 TA26 R RY1 6920WRD014A RELAY ALD112 MATSUSHITA THAILAND 250VAC 3A 12V R RY2 6920WRD014A RELAY ALD112 MATSUSHITA THAILAND 250VAC 3A 12V R RY3 6920W5A0...

Page 44: ...P NO 3828W5S2361 Jun 2002 Printed in Korea ...

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