LG LCS1410SW Service Manual Download Page 21 | Manualshive

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5-10

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

Chassis

Filament

HIGH VOLTAGE
CAPACITOR

Measure the resistance.
(Ohm-meter scale: Rx1000)
• Terminal to terminal.

Normal: Momentarily indicates

several ohms, and
then gradually returns
to infinite.

Normal: Infinite.

Normal: Infinite.
Abnormal: Continuity.

Normal: Continuity.
Abnormal: Infinite.

Measure the resistance.
(Ohm-meter scale: Rx1000)
• Terminal to case.

Measure the continuity (Forward).
(Ohm-meter scale: Rx10000)

Measure the continuity (Reverse).
(Ohm-meter scale: Rx10000)

HIGH VOLTAGE
DIODE

NOTE :
Some inexpensive meters
may indicate infinite
resistance in both direction.

COMPONENTS TEST

PROCEDURE RESULTS

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Summary of Contents for LCS1410SW

Page 1: ...EN SERVICE MANUAL MODEL LCS1410SW CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL Website http us lgservice com P NO MFL06272520 November 2010 Printed in Korea 삼 흥 정 판 Internal Use Only ...

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: ...1 OPERATING SEQUENCE 4 2 SCHEMATIC DIAGRAM II 4 4 CIRCUIT DESCRIPTION 4 5 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 11 EXPLODED VIEW 6 1 REPLACEMENT PARTS LIST 7 1 ...

Page 4: ... Control System Clock 1 00 12 59 Microwave Power for Variable Cooking Power level HIGH Full power throughout the cooking time 9 Saute approx 90 of Full power 8 Reheat approx 80 7 Med High approx 70 6 Medium approx 60 5 Med Low approx 50 4 Defrost approx 40 3 Low approx 30 2 Simmer approx 20 1 Warm approx 10 Owner s manual cooking guide Glass turntable Rotating ring ITEM Model Power Requirement Pow...

Page 5: ...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 2 1 CAUTIONS Unlike other appliances the microwave oven is high voltage and high current equipment Though it is free from...

Page 6: ...ional surface unit or above a conventional wall oven 5 Use microwave oven in an ambient temperature less than 104 F 40 C 6 Place the microwave oven on a sturdy and flat surface at least 10 cm 4 inches from the wall 7 Place the microwave oven as far away as possible from TV RADIO COMPUTER etc to prevent interference GROUNDING INSTRUCTIONS For personal safety this appliance must be fully grounded at...

Page 7: ...SS will subtract 10 seconds to the cooking time 7 AUTO COOK Touch this pad to cook without entering a cook time or power 8 MELT Touch this pad to melt chocolate cheese butter or marshmallows 9 SOFTEN Touch this pad to soften ice cream cream cheese butter or frozen juice 10 NUMBER PADS Touch number pads to enter cook time power level quantities or weights 11 START ENTER This feature allows oven to ...

Page 8: ...G 7 CHILD LOCK This oven has a CHILD LOCK feature TO SET CHILD LOCK Touch pad Touch and hold pad LOCKED appears on the display TO CANCEL CHILD LOCK Touch and hold pad LOCKED disappears 8 MORE LESS The cook time is adjustable by MORE pad or LESS pad 9 AUTO COOK NOTE Then the oven will start automatically 10 QUICK DEFROST 11 KITCHEN TIMER Ez On STOP CLEAR POPCORN STOP CLEAR NUMBER START MORE STOP CL...

Page 9: ...FTEN NOTE Then the oven will start automatically 14 CUSTOM SET NOTE Then the oven will start automatically 15 CLOCK CUSTOM SET NUMBER OF TABLE STOP CLEAR MELT NUMBER OF TABLE STOP CLEAR SOFTEN NUMBER OF TABLE STOP CLEAR CLOCK NUMBER NUMBER START START STOP CLEAR ...

Page 10: ...SCHEMATIC DIAGRAM 4 4 ...

Page 11: ...oximately 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 4 000 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 2 by the applied signal to vary the ...

Page 12: ...ity of the microwave radiation leakage emitted by the microwave oven should not exceed 4 mW cm2 Always start measuring of an unknown field to assure safety for operating personnel from radiation leakage NECESSARY MEASURING INSTRUMENTS TESTER VOLTS DC AC Ohmmeter Microwave survey meter Holaday HI 1500 HI 1501 Narda 8100 8200 Inch scale 600 cc non conductive material beaker glass or plastic inside d...

Page 13: ...lse 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 befween 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 7Hold vertically when testing the top and bottom and horizontally along RECOR...

Page 14: ... material thickness of 3 mm and an outside diameter of approximately 190mm The oven and the empty vessel are at ambient temperature prior to the start of the test The initial temperature T1 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 turntable which is in thd ...

Page 15: ... 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 4 mW cm2 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 do...

Page 16: ...ure 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 cm2 With a 275 ml water load Make sure that gasket is rigidly attached to the magnetron To prevent microwave leakage tighten the mounting scr...

Page 17: ...capacitor 2 Disconnect the leadwire from magnetron high voltage transformer and capacitor 3 Remove the screw holding the high voltage transformer to the baseplate J FAN MOTOR ASSEMBLY REMOVAL 1 Discharge the high voltage capacitor 2 Disconnect the leadwire from fan motor and high voltage capacitor 3 Remove the two screws holding the the suction guide ASS Y to the oven cavity and remove the high vo...

Page 18: ... 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 this adjustment Make sure that the latch moves smoothly after adjustment are com...

Page 19: ...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 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 ...

Page 20: ... THE OVEN HIGH VOLTAGE TRANSFORMER Wire leads removed MAGNETRON Wire leads removed Approx 0 2 0 4 ohm Approx 70 100 ohm Less than 1 ohm Normal Infinite Normal Infinite Normal Less than 1 ohm Normal Infinite PRIMARY TERMINAL FILAMENT WINDING COMPONENTS TEST PROCEDURE RESULTS 1 Measure the resistance Ohm meter scale Rx1 and Rx100 Primary winding Secondary winding Filament winding 2 Measure the resis...

Page 21: ...Normal Momentarily indicates several ohms and then gradually returns to infinite Normal Infinite Normal Infinite Abnormal Continuity Normal Continuity Abnormal Infinite Measure the resistance Ohm meter scale Rx1000 Terminal to case Measure the continuity Forward Ohm meter scale Rx10000 Measure the continuity Reverse Ohm meter scale Rx10000 HIGH VOLTAGE DIODE NOTE Some inexpensive meters may indica...

Page 22: ...E WIRE LEADS ARE IN THE CORRECT POSITION WHEN REMOVING THE WIRE LEADS FROM THE PARTS BE SURE TO GRASP THE CONNECTOR NOT THE WIRES Measure the resistance Ohm meter scale R x 1 Normal A Approx 85 100 ohm B Approx 10 25 ohm Abnormal Infinite or several ohm Normal Approx 100 150 ohm Abnormal Infinite or several ohm POWER LEVEL 1 2 3 4 5 6 7 8 9 10 4 sec 6 sec 8 sec 10 sec 12 sec 14 sec 16 sec 18 sec 2...

Page 23: ...llic ware for cooking except where noted in the cooking guide Do not use any type of cookware with metallic trimming CAUSE REMEDY TROUBLE SHOOTING CAUTIONS 1 Check grounding before checking for trouble 2 Be careful of the high voltage circuit 3 Discharge the high voltage capacitor See page 2 1 4 When checking the continuity of the switches or of the high voltage transformer disconnect one lead wir...

Page 24: ...ly TROUBLE 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 indicates a number different...

Page 25: ...switches and RELAY RY2 of P C B Assembly Check continuity of monitor switch with door closed Continuity No continuity Shorted contact at the primary switch Replace fuse primary monitor secondary switches and RELAY RY2 of P C B Assembly Check continuity of primary switch with door opened Continuity No continuity Malfunction of secondary switch Replace fuse primary monitor secondary switches and REL...

Page 26: ... Defective PCB assembly Loose connection 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 2 and check on and off time with multitester Measure the output power Abnormal Abnormal Normal Defective PCB asse...

Page 27: ...relay 2 Operate the unit Defective PCB assembly Replace PCB assembly Replace high voltage transformer Defective high voltage capacitor Replace high voltage capacitor Abnormal normal Check high vol tage transformer Abnormal normal Check high vol tage capacitor Defective high voltage diode Replace high voltage diode Abnormal normal Check high vol tage diode Defective magnetron Replace magnetron Abno...

Page 28: ...DOOR PARTS CONTROL PANEL PARTS BASE PLATE PARTS OVEN CAVITY PARTS LATCH BOARD PARTS INTERIOR PARTS MAY000 MFL552 OWNERS MANUAL 6 1 EXPLODED VIEW INTRODUCTION EV MODEL ...

Page 29: ... 6 2 DOOR PARTS 13552A 13213A 13581A 14970A 14026A 13536A 14890A 13720D 143501 EV ...

Page 30: ... 6 3 CONTROLLER PARTS 24781M 23506A 23572A 24510L 24970A 250201 268711 WTP018 EV ...

Page 31: ... 6 4 OVEN CAVITY PARTS 33390G WTT010 WSZ185 33112U 36549S WTP013 33052A 34370T 35889A EV ...

Page 32: ... 6 5 LATCH BOARD PARTS WSZ085 466001 466003 466001 43500A 43501A EV ...

Page 33: ...ERIOR PARTS 568771 WSZ062 WSZ002 WEB001 WSZ002 WEB001 WTT028 WTT028 56411A 56930V 56549F 54974S WTT037 55900A 54810C WTT028 50CZZH 56851D 34930W 56324A 55262A 56912B 35012A 948501 WSZ002 54980A 50FZZA 56201A EV ...

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

Page 35: ... 6 8 SENSOR PARTS WTT021 54974T 56501A WTP004 EV ...

Page 36: ......

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