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7-18

B. CHECKOUT PROCEDURES

(1) CHECKOUT PROCEDURES FOR FUSE BLOWING

CAUTION:

REPLACE BLOWN FUSE WITH 20 AMPERE FUSE.

NOTES:

• If the fuse is blown by an improper switch operation, replace all switches and the fuse at the same time.

After replacing the defective switches with new ones, make sure that they are correctly connected.

• Check for microwave energy leakage according to INTERLOCK ADJUSTMENT PROCEDURES on page

7-12 when the primary interlock, secondary interlock switches and/or the interlock monitor switches are
adjusted or replaced.

Fuse blows immediately after
the door is closed.

Fuse blows immediately after
the door is opened.

Fuse blows when the door is closed and
START/ENTER key is touched.

Improper operation of the primary interlock, secondary
interlock switches and/or the interlock monitor switch.

Malfunction of the high voltage transformer;the high
voltage capacitor including the diode, the magnetron,
the blower motor or the circuit board.

PROBLEMS

CAUSES

LGE Internal Use Only

Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes

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Содержание MVH1670ST

Страница 1: ...site http us lgservice com MICROWAVE OVEN SERVICE MANUAL MODEL MVH1670ST CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL P NO MFL05746502 August 2007 Printed in Korea Internal Use Only ...

Страница 2: ...sadjusted 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 each oven prior to release to the owner Proper operation of the m...

Страница 3: ... 2 MATRIX CIRCUIT FOR TOUCH KEY BOARD 5 3 GENERAL INFORMATION FOR SERVICE 6 1 GENERAL PRECAUTIONS IN USE 6 1 TRIAL OPERATION 6 1 FEATURES AND SPECIFICATIONS FEATURES 6 1 SERVICE INFORMATION 7 1 PRECAUTIONS AND REPAIR SERVICE TIPS 7 1 MICROWAVE LEAKAGE TEST 7 2 POWER OUTPUT MEASUREMENT 7 3 DISASSEMBLY INSTRUCTIONS 7 4 INTERLOCK SYSTEM 7 12 INTERLOCK CONTINUITY TEST 7 14 TEST AND CHECKOUT PROCEDURES...

Страница 4: ...ch Interlock Monitor Magnetron 2M214 161GP High Voltage Capacitor Capacitor 1 0µF 2 1 KV AC High Voltage Diode Diode 350mA 9 0 KV Cook top Lamp 125 V 30 W Cavity Lamp 125 V 30 W Timer Digital up to 99 mim 99 sec in each cooking stage Tray Tempered Safety Glass Overall Dimensions 2915 16 W x167 16 H x153 8 D Oven Cavity Size 219 16 W x83 4 D x14 1 8 H Effective Capacity of Oven Cavity 1 6 Cu ft Acc...

Страница 5: ...netron 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 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 duri...

Страница 6: ...duces the risk of electrical shock The plug must be plugged into an outlet that is properly installed and grounded INSTALLATIONS BEFORE YOU BEGIN READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY CAUTION This unit is equipped with a 3 prong plug for your safety If the wall outlet is a grounded 3 hole type the unit will be grounded automatically WARNING Improper use of the grounding plug can...

Страница 7: ...3 15 14 16 1 4 12 17 18 2 3 5 6 7 8 9 10 11 19 20 21 22 23 24 CONTROL PANEL NOTE Styling and features vary by model LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...

Страница 8: ...ATER Touch this pad when heating water in your microwave oven 13 POPCORN Touch this pad when popping popcorn in your microwave oven 14 MELT Touch this pad to melt butter or margarine chocolate cheese marsh mallow 15 SOFTEN Touch this pad to soften butter ice cream cream cheese frozen juice 16 KITCHEN TIMER Touch this pad to set the kitchen timer 17 HOLD WARM Touch this pad to keep hot cooked foods...

Страница 9: ...5 1 OVERALL CIRCUIT DIAGRAM SCHEMATIC DIAGRAM LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...

Страница 10: ...i Low Off VENT Hi Low Off HOT WATER HOT DOG BABY FOOD OAT MEAL REHEAT 8 1 2 TIME HOLD WARM 3 1 2 START AUTO QUICK DEFROST DEFROST TIMER KITCHEN CLOCK MORE LESS 4 7 8 9 0 5 3 4 6 EZ ON SOFTEN MELT 5 6 7 LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...

Страница 11: ...lay 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 Four long beep sound signal is heard when the time is up The unit will shut ...

Страница 12: ...crowave 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 cause microwave energy leakage NOTE Always keep the seal clean e Make ...

Страница 13: ...nsity 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 EQUIPMENT TESTER VOLTS DC AC Ohmmeter Microwave survey meter Holaday HI 1500 HI 1501 Narda 8100 8200 600 cc non conductive material beaker glass or plastic inside diameter approx 8 5 cm 3 1 2 in ...

Страница 14: ...romagnetic energy leakage monitor checked for calibration by its manufacturer 1 Microwave power output measurement is made with the microwave oven supplied at its rated voltage and operated at its maximum microwave power setting with a load of 1000 5 g of potable water 2 The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 1 8 3 mm and an outside...

Страница 15: ...a screw securing the control panel assembly to the oven cavity 2 Remove the control panel with pushing it upward 3 Remove the three connectors CN1 CN2 CN3 and wire leads Relay7 from the circuit board 4 Remove 3 screws securing the circuit board 5 Remove the FPC connector from the terminal socket following HOW TO REMOVE THE FPC CONNECTOR on the next page 6 Remove the circuit board from the control ...

Страница 16: ...he 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 properly engaged with the hooks on the plastic fastener 3 Lock the level of the plastic fastener into the hook of the terminal socket securely by releasing the fingers F...

Страница 17: ... the out case Remove the Mount All from the out case by removing two screws securing it to the out case and one screw securing it to the ventilation motor ASS Y and cavity 6 Remove the power cord cover from outcase by removing a screw 7 Remove the power cord to the inner of the out case with turning power cord and remove the out case with pushing it back Door Mount All Vent Grille Out Case Mountin...

Страница 18: ...d check microwave energy leakage according to ADJUSTMENT PROCEDURE on page 7 12 Latch Board Secondary Interlock Switch Interlock Monitor Switch Primary Interlock Switch Latch Board Secondary Interlock Switch Monitor Interlock Switch Primary Interlock Switch Figure 9 Figure 10 LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...

Страница 19: ...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 vertgrille mount all outcase Magnetron Figure 11 Figure 12 Fi...

Страница 20: ...condary interlock switch and the interlock monitor switch operate normally After replacing the door check for microwave energy leakage with a survey meter Microwave energy leakage must be below the limit of 5mW cm2 With a 275 ml water load G DISASSEMBLING DOOR Figure 15 b 1 Remove the dielectric choke by using knife blade or small screw driver etc 2 Remove two screws securing it to the door handle...

Страница 21: ... the door and the oven I REMOVING THE VENTILATION FAN ASS Y 1 Remove the mounting plate by removing two screws securing it to the back plate See Figure 16 2 Remove the two screws securing the MOUNT ALL and one screw securing the ventilation fan ASS Y See Figure 17 3 Carefully pull the ventilation motor ASS Y out of the microwave oven See Figure 18 Space MOUNT ALL Figure 16 Figure 17 Figure 18 Figu...

Страница 22: ...ct the leadwire from the turntable motor terminals 5 Remove the 1 or 2 screws securing the turntable motor to the oven cavity ASS Y Figure 21 NOTES Remove the leadwire from the turntable motor VERY CAREFULLY Be sure to grasp the connector not the wires when removing Wire Leads Turntable Motor Figure 19 Figure 20 Figure 21 LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved O...

Страница 23: ...d 6 to check the sequence of the switches NOTE To correct sequence of the Primary Interlock Switch Secondary Interlock Switch and the Interlock Monitor Switch is very important If any gap is larger than 1 64 0 5 mm you will need to adjust the latch board Go to step 3 and follow all steps in order ADJUST THE LATCH AND SWITCH CLOSING 3 Loosen the two screws holding the plastic latch board as shown 4...

Страница 24: ...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 the proper sequence of switches in Steps 5 and 6 tighten the latch...

Страница 25: ...tment 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 indicate an open circuit When the monitor switch operation is abnormal...

Страница 26: ...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 meter scale Rx1000 Filament to chassis Normal Less than ...

Страница 27: ...eter scale Rx1000 CAPACITOR DIODE Some inexpensive ohm meters may indicate 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 7 1 Remove wire leads 2 Measure resistance ohm meter scale Rx1 High speed Blue and Black wire Low speed Blue and White wire VENTILATION MOTOR Power Level Open...

Страница 28: ...E SURE TO GRASP THE CONNECTOR NOT THE WIRES COOK 12 LEVEL POWER STOP CLEAR POPCORN 11 10 9 COOK SOUP T T ON OFF Light Hi Low Off VENT Hi Low Off HOT WATER HOT DOG BABY FOOD OAT MEAL REHEAT 8 1 2 TIME HOLD WARM 3 1 2 START AUTO QUICK DEFROST DEFROST TIMER KITCHEN CLOCK MORE LESS 4 7 8 9 0 5 3 4 6 EZ ON SOFTEN MELT 5 6 7 Normal Approximately 2 5 to 3 5 K ohm Abnormal Infinite or several 1 Remove wir...

Страница 29: ...ck secondary interlock switches and or the interlock monitor switches are adjusted or replaced Fuse blows immediately after the door is closed Fuse blows immediately after the door is opened Fuse blows when the door is closed and START ENTER key is touched Improper operation of the primary interlock secondary interlock switches and or the interlock monitor switch Malfunction of the high voltage tr...

Страница 30: ... NO YES YES GOOD Defective RELAY1 12 PROBLEM B Vent fan motor and oven lamp turn on When the door is closed and START key is touched Measure the voltage at pin NO 47 50 of U01 or 48 49 51 of U01 Voltage reading 0 Vdc Replace the circuit board Defective RELAY1 12 or poor connection of RELAY1 12 Replace RELAY1 12 or correct the connection YES NO NO YES GOOD LGE Internal Use Only Copyright 2007 LG El...

Страница 31: ...ained 4 The buzzer does not sound or continues to sound 5 Some segments of one or more digits do not light up or they continue to light up or segments light when they should not 6 Wrong figures appear 7 The figures of all digits 8 Some of the indicators do no flicker light up 9 The clock does not keep time properly NOTE A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERV...

Страница 32: ...7 18 3 OVEN CAVITY THERMOSTAT 1 1 Measure voltage between pin 1 and pin 3 of connector CN1 0 120 120V Replace circuit board Normal circuit board Normal resistance Voltage incorrect Correct connections 0 120 WH RD Runs Runs Measure resistance of touch key board after removing connector S1 See page 7 4 and 7 17 Normal resistance Resistance incorrect Replace touch key board Normal touch key board Poo...

Страница 33: ...ontact of connector S1 Check the contact of relay 7 see page 7 16 Runs Runs Resistance incorrect Check the continuity of H V C see page 7 16 Normal H V T Resistance incorrect Normal H V C Abnormal Replace H V D Normal Magnetron Replace Magnetron Normal Normal H V D Check the continuity of H V D see page 7 16 Replace H V C Normal resistance Replace H V T Normal resistance Measure resistance of H V ...

Страница 34: ...he key between stages or at end of cooking 1 Normal circuit board Check normal operation circuit board Replace circuit board Runs LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...

Страница 35: ...act Replace circuit board Normal circuit board Contact OK Normal contact Correct seating Check contact of connector S1 see page 7 4 NO runs Check the contact of magnetron thermal fuse and oven thermostat Runs Runs Runs Runs Check 1 POWER SUPPLY 2 FUSE LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...

Страница 36: ...RTS MODEL MVH1670ST EXPLODED VIEW 13581A 13551A 13213A 13536A 13552A WTT021 14026A 14970A 13650A EV LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...

Страница 37: ... 8 2 CONTROLLER PARTS 268711 24810P 07 2 07 1 23551A 24781M WTP018 EV LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...

Страница 38: ...8 33112U 34960A 34810Q 33052A 35026G 34930R 33530A 56804A 63303A 63302A 34890C 34810T WTT010 35230A 36912C WTT010 33550L EV LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...

Страница 39: ... 8 4 LATCH BOARD PARTS 43501A WSZ085 43500A 466001 466003 466001 44510A EV LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...

Страница 40: ...324A WTT021 56170D 53300B WSZ002 53301A 50CZZH 54810C 56851D WSZ002 WTP013 36549S 35889A 34370T 33390G WTT021 33741A EV LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...

Страница 41: ...550L 55231C 56804A WTT028 55262A 56411A 56930V 568771 WSZ002 55892A 53550F 340511 54930F 53740A WTT021 50FZZA 56201A 55893A EV LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...

Страница 42: ...862D 63300M 01 USE CARE 04 INSTALLATION MANUAL 06 1 UPPER TEMPLATE 06 2 WALL TEMPLATE 05 1 COOKING GUIDE LABEL 05 2 COOKING GUIDE LABEL EV LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...

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