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7-16

COMPONENTS

TEST PROCEDURES

RESULTS

CIRCUIT BOARD

TOUCH KEY

BOARD

See page 7-19 for “CHECKOUT PROCEDURES FOR THE CIRCUIT BOARD”

NOTE: A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS

SERVICED FOR ANY REASON.

Measure the resistance between terminal
pins of connector KEY CON.
NOTE:
When reconnecting the FPC connector,
make sure that the holes on the FPC
connector are properly engaged with hooks
on the plastic fastener.

MATRIX CIRCUIT FOR

TOUCH KEY BOARD

CONNECTOR(KEY CON)

Figure 26

Resistance

value

When

When not

touched

touched

Less than More than
400 ohms 1 mega ohm

1
2
3
4
5
6
7
8
9
10
11
12
13

FPC CONNECTOR

Top

Figure 27

TIMER

Ez On

CUSTOM

SET

FRESH

VEGETABLE

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Содержание MV-1304B

Страница 1: ...MICROWAVE OVEN SERVICE MANUAL MODEL MV 1304W B CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL P NO 3828W5S1599 May 2000 Printed in Korea Website http biz lgservice com ...

Страница 2: ...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 each ove...

Страница 3: ...RAM 5 1 MATRIX CIRCUIT FOR TOUCH KEY BOARD 5 2 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 11 INTERLOCK CONTINUITY TEST 7 13 TEST AND CHECKOUT PROCE...

Страница 4: ...C 4 C Oven Cavity Thermostat Open at 90 C 4 C Fuse 20A Primary Interlock Switch Secondary Interlock Switch Interlock Monitor Magnetron 2M214 5129F High Voltage Capacitor Capacitor 0 95µF 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 mm 99 sec in each cooking stage Tray Tempered Safety Glass Overall Dimensions 217 8 W x165 8 D...

Страница 5: ... area Proper 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 Unlike other appliances the microwave oven is high voltage and high current equipment Though it is free from...

Страница 6: ...t 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 BEFORE YOU BEGIN READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY WARNING Improper use of the grounding plug can result in a risk of electric shock Do not under any circumstances cut or remove the third ground...

Страница 7: ...3 12 16 7 5 4 8 13 14 15 17 6 10 11 9 19 20 18 Vent On Off Light On Off Custom Set One Touch Control Potato Beverage Popcorn Frozen Entree Fresh Vegetable Auto Defrost Time 0 Power Stop Clear Start 7 8 9 4 5 6 1 2 3 Ez On Clock Timer More Less 1 ...

Страница 8: ...y weight 10 FROZEN ENTREE Touch this pad to reheat 10 oz 11 FRESH VEGETABLE Touch this pad to cook from 1 to 4 cups 12 NUMBER Touch number pads to enter cooking time power level quantities or weights 13 POWER Touch this pad to select a cooking power level 14 TIME Used to set manual time cooking 15 STOP CLEAR Touch this pad to stop the oven or to clear all entries 16 START Touch this pad to start a...

Страница 9: ...5 1 SCHEMATIC DIAGRAM OVERALL CIRCUIT DIAGRAM ...

Страница 10: ...TIMER Ez On CUSTOM SET FRESH VEGETABLE 5 2 MATRIX CIRCUIT FOR TOUCH KEY BOARD ...

Страница 11: ...condary 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 will shut off automatically F Confirm the water is hot G Finally measure the output power according to POWER OUTPUT MEASURE...

Страница 12: ... 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 cause microwave ...

Страница 13: ... for microwave leakage after every servicing The power density 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...

Страница 14: ...rgy leakage not be more than 2 mW cm2 after determining that all parts are in good condition functioning properly and genuine replacement parts which are listed in this manual have been used 3 At least once a year have the electromagnetic energy leakage monitor checked for calibration by its manufacturer 1 Microwave power output measurement is made with the microwave oven supplied at its rated vol...

Страница 15: ...CHES AND HIGH VOLTAGE CIRCUIT A REMOVING 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 three connectors CN1 and wire leads Relay2 and or Relay5 from the circuit board 4 Remove 2 or 3 screws securing the circuit board 5 Remove the FPC connector from the terminal...

Страница 16: ... 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 properly engaged with the hooks on the plastic fastener 3 Lock the level of the plastic fastener into the hook o...

Страница 17: ...hem to the out case on the base plate Remove the mount all from the out case by removing two screws securing it to the out case 5 Remove four screws securing them to the back plate 6 Slap the both side of out case backward by 1 2 inches 7 Disconnect the power cord connector from the noise filter and remove the earth screw 8 Remove the out case with pushing it backward completely Vent Grille Contro...

Страница 18: ...condary Interlock Switch Monitor Interlock Switch Primary Interlock Switch Latch Board GR from P C B GR from earth PK from P C B Secondary Interlock Switch Monitor Interlock Switch Primary Interlock Switch BR from Relay 2 YL from Fan Motor WH from Cook top Lamp BK from Noise Filter BR from H V Transformer BK from Relay2 YL from Base Thermostat RD from H V Transformer Figure 9 Figure 10 WIRE COLOR ...

Страница 19: ...nd pull it to the right very carefully NOTES When removing the magnetron make sure that its dome does not hit any adjacent parts or it may be damaged 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 After replacing the magnetron check for microwave energy leakage with a survey meter Check microwave energy ...

Страница 20: ...Y See Figure 16 Flat blade screw driver Mount all Figure 15 Figure 16 Space E REMOVING DOOR Figure 13 1 Remove the vent grille by removing two screws securing it to the front of the out case 2 Remove the door cap with small screw driver 3 Lift up and push the door F DISASSEMBLING DOOR Figure 14 1 Remove the choke cover by using knife blade or small screw driver etc CAUTION Be careful not to damage...

Страница 21: ...ecuring it to the oven cavity Figure 17 4 Disconnect the leadwire from the turntable motor terminals 5 Remove the 2 screws securing the turntable motor to the oven cavity ASS Y Figure 18 NOTES Remove the leadwire from the turntable motor VERY CAREFULLY Be sure to grasp the connector not the wires when removing 7 10 Wire Leads Turntable Motor Figure 18 Figure 17 ...

Страница 22: ...ps 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 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...

Страница 23: ...ro 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 the prope...

Страница 24: ...n 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 the door is c...

Страница 25: ... each filament terminal of the magnetron and the chassis ground with an ohm mater on high test scale 1 Measure the resistance With an ohm meter on Rx1 scale a Primary winding b Filament winding c Secondary winding 2 Measure the resistance With an ohm meter on highest scale a Primary winding to ground b Filament winding to ground Normal reading Less than 1 ohm Normal reading Infinite ohms NOTE Repl...

Страница 26: ...tinuity 1 Forward Ohm meter Figure 24 1 Reverse Ohm meter Figure 25 Normal reading Momentarily indicates several ohms and then gradually returns to infinite ohms Abnormal reading Indicates continuity or infinite ohms from the beginning Normal readings Infinite Abnormal reading Indicates continuity Normal readings continuity Abnormal reading Infinite Normal readings Infinite Abnormal reading contin...

Страница 27: ...e resistance between terminal pins of connector KEY CON NOTE When reconnecting the FPC connector make sure that the holes on the FPC connector are properly engaged with hooks on the plastic fastener MATRIX CIRCUIT FOR TOUCH KEY BOARD CONNECTOR KEY CON Figure 26 Resistance value When When not touched touched Less than More than 400 ohms 1 mega ohm 1 2 3 4 5 6 7 8 9 10 11 12 13 FPC CONNECTOR Top Fig...

Страница 28: ...eration 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 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 20 sec 22 sec 18 sec 16 sec 14 sec 12 sec 10 sec 8 sec 6 ...

Страница 29: ... the circuit board Does the unit still operate GOOD Replace the circuit board PROBLEM B FAN motor and oven lamp turn on When the door is closed and START key is touched Measure the voltage at pin NO 36 of U01 Voltage reading 0 Vdc Replace the circuit board Defective RELAY1 or poor connection of RELAY1 Replace RELAY1 or correct the connection NO NO YES NO NO YES YES GOOD ...

Страница 30: ...he interlock switches the door sensing and the relay check good 2 The unit with a normal relay continuously operates 3 Proper temperature measurement is not obtained 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 t...

Страница 31: ...PERATION on page 6 1 DISPLAY Problems A thru C BUZZER Problems F HELP UP Problems D thru E WH RD Measure voltage between pin 1 and pin 3 of connector CN1 Runs Runs Runs Runs Runs 0 120 Measure resistance of touch key board after removing connector S1 See page 7 4 and 7 16 0 120 120V Replace circuit board Normal circuit board Normal resistance Voltage incorrect Normal resistance Resistance incorrec...

Страница 32: ...rrect seating Normal circuit board Normal contact Poor contact Normal Primary switch No continuity Adjust or replace door sensing switch Measure resistance of H V capacitor see page 7 16 Resistance incorrect Normal resistance Normal operation No operation Replace thermostat Normal thermostat Measure resistance of fan motor 38 8 ohms Resistance incorrect Replace fan motor Normal fan motor Normal ci...

Страница 33: ...ect 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 NO continuity Replace circuit board Normal circuit board Poor contact Replace circuit board Normal circuit board Contact OK Normal contact Correct seating Check contact of connector S1 Runs Runs Ru...

Страница 34: ...7 23 PROBLEM F No buzzing when touching the key between stages or at end of cooking 1 Normal circuit board Check normal operation circuit board Replace circuit board Runs ...

Страница 35: ...uns Runs Contact OK NO contact Replace magnetron thermostat Poor contact Replace circuit board Normal circuit board Contact OK Normal contact Correct seating Check contact of connector S1 see page 7 4 Runs Replace ventilation motor ASS Y NO runs Normal ventilation motor ASS Y Check the contact of magnetron thermostat ...

Страница 36: ...8 1 EXPLODED VIEW DOOR PARTS 13581A 13552A 13720D 13720D 13536A 13552A 15006A 14026A 14970A EV MODEL MV 1304W B ...

Страница 37: ...8 2 CONTROLLER PARTS 24781M 26638A 23572A 24810P 268711 24510L 24970A 250201 EV ...

Страница 38: ...8 3 OVEN CAVITY PARTS 33530A 340511 33052M WTT022 53550L 95230A 34810T 34890C 63302A 56912B 56804A 34960A 33112U 368771 EV ...

Страница 39: ...8 4 LATCH BOARD PARTS 43501A 43500A 466001 466003 466001 EV ...

Страница 40: ...8 5 INTERIOR PARTS I 33390G 35889A 34036W 36549S 56170D 53300B 30RMZZ 56930G 54974A 56201B 56324A EV ...

Страница 41: ...8 6 INTERIOR PARTS II 55262A 53550L 36549V 54810C 56851D 56411A WTT033 50CZZH 56912C 56930V 44360A 56549F 568771 56930M 56201A 55900A 50FZZA EV ...

Страница 42: ...8 7 INSTALLATION PARTS 63301M 65862B 65862D 949221 EV ...

Страница 43: ...8 11 SCHEMATIC DIAGRAM OF P C B ...

Страница 44: ......

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