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5-14

Trouble Shooting Guide

CAUTIONS
1. Check grounding before checking for other trouble.
2. Be careful of the high voltage circuit.
3. When checking the continuity of the switches or transformer, disconnect one lead wire from these parts and

then check continuity without turning the power source on.

4. Do not touch any part of the circuitry on the control circuit board, since static electric discharge may damage

this control circuit.
Always touch yourself to ground while working on this circuit to discharge any static charge built up in your
body.

5. First operate the microwave oven following the correct operating.
6. If the oven become inoperative because of a fuse, check the primary, the secondary and the monitor switches

before replacing the fuse.

CONDITION

The fuse blows when power
cord is plugged into wall
receptacle.

Shorted lead wise assy or
wire hardness.

Replace lead wire or check
and repair wire hardness.

CAUSE

OFF CONDITION

TEST PROCEDURE OR

CORRECTION

Defective monitor switch or
out of adjustment.

Test procedure switches.

": 0" does not appear in
displasy window when
power cord is first plugged
into wall outlet.

Microwave oven plug is not
inserted tightly.

Insert microwave oven plug
securely.

Display does not operate
properly when CLOCK is
touched.

Defective tact switch key of
P.C.B.

Test procedure tact switch
key.

No power at outlet.

Check home fuse.

Blown fuse.

Test procedure fuse.

Open wire in power cord,
wiring harness, or wiring
between control panel
assembly units.

Replace or repair wiring.

(TROUBLE 1) Oven does not operate all.

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Содержание MC-806BLR

Страница 1: ...MICROWAVE OVEN SERVICE MANUAL MODEL MC 806BLR CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL Website http biz lgservice com P NO 3828W5S3936 August 2004 Printed in Korea ...

Страница 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...

Страница 3: ...G SEQUENCE 4 2 SCHEMATIC DIAGRAM 4 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 8 COMPONENT TEST PROCEDURE 5 9 TROUBLE SHOOTING GUIDE 5 14 EXPLODED VIEW 6 1 REPLACEMENT PARTS LIST 7 1 CONTENTS ...

Страница 4: ...rowave Power for Variable Cooking Power level HIGH Full power throughout the cooking time 100 MED HIGH approx 80 of Full power MEDIUM approx 60 of Full power DEFROST approx 40 of Full power LOW approx 20 of Full power Convection Max 250 C Grill Combination Owner s manual Glass tray Rotating ring Convection rack Grill rack Metal tray Rotisserie Bar Rotisserie Handle 1 1 ITEM MODEL Power Requirement...

Страница 5: ... 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 appliance Though it is free from danger in ordinary use extreme care should be taken during re...

Страница 6: ...be plugged into a 15A outlet 9 Do not touch the front glass during or after cooking of the Grill Convection and Combination mode This glass is very hot during heater operating 10 Do not operate oven at microwave and combination mode with the Convection rack or 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 ...

Страница 7: ...Cooking power level Cooking category 7 COMBINATION To select combination cooking 8 CONVECTION To select convection cooking 9 AUTO WEIGHT DEFROST To select auto weight defrost 10 LESS MORE To select convection temperature and change auto cook time and auto reheat time 11 STOP CLEAR CHILD LOCK Stops the oven and clear all entries except the time of day 12 START QUICK START To quickly set the cooking...

Страница 8: ...ired power level Desired cooking time Stop Clear Desired convection temp 40 C 100 C 250 C Start Combination Desired convection temp 100 C 250 C Grill Stop Clear Desired auto roast category Desired cooking weight Start Stop Clear Desired auto cook category Desired cooking weight Start Stop Clear Desired defrost category Desired cooking weight Start Stop Clear Stop Clear Touch and HOLD Stop Clear St...

Страница 9: ...SCHEMATIC DIAGRAM 4 3 ...

Страница 10: ...of the high voltage transformer which is increased by the action of the diode and charging of the high voltage capacitor The negative D C voltage is then applied to the filament of the magnetron WHEN THE DOOR IS OPEN DURING COOKING Both primary switch and secondary switch open to cut off the primary winding voltage to the high voltage transformer to stop microwave oscillation Turntable and fan mot...

Страница 11: ...y 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 surface being measured Move probe alo...

Страница 12: ...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 the...

Страница 13: ... the following formula 4187 x T T is measured while the microwave generator is operating at full power Magnetron filament heat up time is not included about 2 sec 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 order to minimize addition or removal of heat WATER LOAD TURNTAB...

Страница 14: ...ormally 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 door has no play between the inner door surface and oven frame assembly If the door assembly is no...

Страница 15: ...rts or it may be damaged 2 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 3 After replacing the magnetron check for microwave energy leakage with a survey meter around the magnetron Microwave energy must be below the limit of 5mW cm2 With a 275 ml water load Make sure that gasket is rigidly attached to t...

Страница 16: ...e guide suction and lift it up G OVEN LAMP REMOVAL 1 Disconnect the wire leads from oven lamp 2 Remove one screw securing the Air Duct to the magnetron 3 Push hook to Right and Left of Air Duct with Drive 4 Lift the oven Lamp up H HIGH VOLTAGE TRANSFORMER REMOVAL 1 Disconnect the wire leads from the transformer to the magnetron C Protector ASS Y assembly 2 Remove four screws securing the H V trans...

Страница 17: ...ate 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 AND SECONDARY SWITCH TO THE LATCH BOARD 3 INSTALLATION AND 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 the oven door will not have any pl...

Страница 18: ...d indicate a open condition When the door 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 multimeter leads to the common COM and normally close NC terminals of the switch The meter ...

Страница 19: ...ULTS HIGH VOLTAGE TRANSFORMER Wire leads removed MAGNETRON Wire leads removed 1 Measure the resistance Multi meter scale R X 1 Primary winding Secondary winding Filament winding 2 Measure the resistance Multi meter scale Rx1000 Primary winding to ground Filament winding to ground 1 Measure the resistance Multi meter scale R X 1 Between filament terminals 2 Measure the resistance Multi meter scale ...

Страница 20: ... R x 1000 Terminal to case Measure the continuity Forward Multi meter scale R x 10000 Measure the continuity Reverse Multi meter scale R x 10000 Normal Momentarily indicates several ohms and then gradually returns to infinite Normal Normal Continuity Abnormal Normal Abnormal Continuity NOTE When testing the magnetron be sure to install the magnetron gasket in the correct position and be sure that ...

Страница 21: ...nd H V C before 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 R x 1 Normal Grill heater Approx 40 7 Ω at 20 30o C Normal more than 0 5M Ω Normal Abnormal Measure the resist...

Страница 22: ...TER Wire leads removed SOLENOID RECTIFIRE ASM VOLTAGE FOR SOLENOID Measure the resistance Multi meter scale R x 1 Measure the resistance Multi meter scale R x 1 Normal COM 230V Approx 150 Ω COM 24V Approx 20 Ω Abnormal Infinite or several ohm Normal Approx 200 300 Ω Abnormal Infinite or several ohm Normal Approx 134 Ω Abnormal Infinite or several ohm DC 24V ...

Страница 23: ...nuity between switch terminals by pressing an appropriate pad on key board The contacts assignment 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...

Страница 24: ...eck the primary the secondary and the monitor switches before replacing the fuse CONDITION The fuse blows when power cord is plugged into wall receptacle Shorted lead wise assy or wire hardness Replace lead wire or check and repair wire hardness CAUSE OFF CONDITION TEST PROCEDURE OR CORRECTION Defective monitor switch or out of adjustment Test procedure switches 0 does not appear in displasy windo...

Страница 25: ...ther than touch keys Display fixes some figure and can not accept any input Loose connection Connect them tightly Incorrect touch key Touch key again after closing Set time does not count down when touched START Defective secondary switch or out of adjustment Test procedure secondary switch Defective tact switch key of P C B Test procedure tact switch key of P C B Loose connection Test tact switch...

Страница 26: ... voltage Food temperature is too low This may not be a defect It is possible that the food should be cooked for a longer period Output is too high when you set lower power level Defective relay 2 of P C B Test procedure relay 2 of P C B High AC input voltage Use the microwave oven at adequate line voltage Turntable motor does not operate Refer to preceding turntable motor problem Uneven cooking In...

Страница 27: ...age Use the microwave oven at adequate line voltage Open or loose wiring to above components Check and repair wiring Blown fuse Check fuse Spark occurring Using metallic ware and allowing it to touch the oven wall Do not use metallic ware for cooking except where noted in the cookbook Ceramic ware trimmed in gold or silver powder is used Do not use any type of cook ware with metallic trimming Gril...

Страница 28: ...al temperature of oven cavity F5 Wait until low temperature of oven cavity Temperature in the oven cavity is lower or higher than preset Defective relay 3 4 or relay 8 Test procedure relay 3 4 or relay 8 of P C B Defective convection heater element Test procedure convection heater Defective grill heater element Test procedure grill heater Defective circulation Motor Check the rotating of circulati...

Страница 29: ... go into cook cycle when START key is touched Temperature in the oven cavity is lower or higher then preset Defective relay 3 of P C B Test procedure relay 3 of P C B CAUSE TEST PROCEDURE OR CORRECTION Open or loose wire connection to the above components Check and repair wiring Open or loose wire connection to P C B Check and repair wiring Test procedure relay 3 of P C B Test procedure grill heat...

Страница 30: ...DOOR PARTS CONTROL PANEL PARTS LATCH BOARD PARTS BASE PARTS INTERIOR PARTS OVEN CAVITY PARTS 6 1 EXPLODED VIEW INTRODUCTION ...

Страница 31: ...6 2 13551A 13581A 14970A 14026A 13552A 15006A 13213A 14890A DOOR PARTS ...

Страница 32: ...6 3 WTP004 268711 WTP015 268712 23790D 23551A 24781S 23551B 250201 250202 24970A 24510L 25006A 24402A 249401 23550D CONTROL PANEL PARTS ...

Страница 33: ...4A 33112U WTT021 WTT010 35301A 348101 35300A 348102 33550H WMT002 WTP013 36549R 34960A 33052M 34930R 34370T 34271A 35889A 33390G 33390M 35026G 35026C 33650T 36549S WTT011 WTP013 34370Z 34810R WTT011 OVEN CAVITY PARTS ...

Страница 34: ...6 5 WSZ085 466001 43501A 466003 466001 43500A LATCH BOARD PARTS ...

Страница 35: ...FZZA WSZ002 56201A WTT037 56549F 56930M 56912B WMP002 54810U 56851D 56851C 55262A 56021A 54072A 568771 948504 56324A 54370D 948503 568772 54790A WWP006 54932A 55900A 50CZZH WTT028 WSZ002 WSZ002 54810A WTP002 WTT028 54810C 54974S WWP008 WWS005 WNH003 948502 WTT021 WNH002 WTT021 WMT002 WSZ062 948501 INTERIOR PARTS ...

Страница 36: ...6 7 WSZ062 WSZ002 WTT030 948505 948505 63302A 56170D 647781 63303A 948506 BASE PLATE PARTS ...

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