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C. REMOVING THE PRIMARY INTERLOCK SWITCH,

INTERLOCK MONITOR SWITCH AND
SECONDARY INTERLOCK SWITCH

(Figures 15, 16)

(1) Disconnect the wire leads from the primary interlock

switches.

(2) Remove two screws securing the Latch Board.

(3) Make necessary replacement and check microwave

energy leakage according to "1. ADJUSTMENT
PROCEDURE" on page 3.

— 16 —

Latch Board

Secondary
Interlock
Switch

Primary
Interlock
Switch

Interlock
Monitor
Switch

Oven Lamp
Switch

Figure 16

Latch Board

RED (From Monitor Switch)
WHITE (From Power Cord)

Oven Lamp Switch

RED (From Secondary Switch)
WHITE (From Fan Motor)
PINK (From PCB)

RED (From Magenetron Thermostat)
RED (From PCB)
WHITE (From H.V. Trans)
Interlock Monitor Switch

PINK (From PCB)
BLUE (From PCB)
BLUE (From PCB)

Primary Interlock Switch

BLUE (From Tower Motor)

Secondary Interlock Switch

WHITE (From H.V Trans)

BLACK (From Oven Lamp)

BLUE (From Oven Lamp)

Figure 15

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Summary of Contents for MV-1155W

Page 1: ...Website http biz lgservice com MICROWAVE OVEN SERVICE MANUAL MODEL MV 1155W CAUTION BEFORE SERVICING THE UNIT READ THESAFETY PRECAUTIONS IN THIS MANUAL P NO 3828W5S0807 Printed in Korea ...

Page 2: ...er 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 performanc Standard should be performed on each o...

Page 3: ...ERAL PRECAUTIONS IN USE 5 TRIAL OPERATION 5 FEATURES AND SPECIFICATIONS 5 6 OVERALL CIRCUIT DIAGRAM 7 8 OPERATING PROCEDURES 9 10 PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE 11 12 DISASSEMBLY INSTRUCTIONS 13 20 PRECAUTIONS AND REPAIR SERVICE TIPS 21 TEST AND CHECKOUT PROCEDURES AND TROUBLESHOOTING A TEST PROCEDURES 22 28 B CHECKOUT PROCEDURES 28 30 C TROUBLESHOOTING 31 36 EXPLODED VIEW 37 45 ...

Page 4: ... L 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 With the oven door closed tightly move the latch board upward toward the top of the oven and or away from the door latch until the gaps are less than 1 64 5 mm Hold the latch board tigtly in this position until you check the sequence of the switches i...

Page 5: ... 4 Latch Board Secondary Interlock Switch Oven Lamp Switch Interlock Monitor Switch Primary Interlock Switch Figure 1 a Latch 0 1 64 0 1 64 ...

Page 6: ...egin cooking and the display window will show the time counting down by seconds E After about 5 minutes make sure the primary interlock switch the secondary interlock switch and the interlock monitor and oven lamp switch operate properly by opening and closing the door several times Touch the START key each time the door is closed F Continue operating the unit Two short and a long beep sound signa...

Page 7: ...n Thermostat Open at 150 C 6 C Close at below 0 C Fuse 15A Primary Interlock Switch Secondary Interlock Switch Interlock Monitor Magnetron 2M214 19F High Voltage Capacitor Capacitor 0 91μ Fd 2 1KV Ac High Voltage Diode Diode 350mA 9 0KV Cook top Lamp 125V 30W Cavity Lamp 125V 30W Timer Digital up to 99 min 99 sec in each cooking stage Tray Ceramic Plate Overall Dimensions 297 8 W x14 D x163 16 H O...

Page 8: ...6 OVERALL CIRCUIT DIAGRAM A SCHEMATIC DIAGRAM 7 ...

Page 9: ...GHT OFF AUTO COMBI CONV BAKE CONV BROIL COMBI BAKE COMBI ROAST FAN HIGH FAN LOW FAN OFF LIGHT HIGH LIGHT NIGHT ROOM TEMP FROZEN TEMP POULTRY 11 12 13 CUSTOM COOK SENSOR COOK SENSOR POPCORN STOP CLEAR 4 N C N C N C N C N C 7 3 4 6 1 CLOCK POWER START 5 0 TIME FISH MEAT N C Figure 3 ...

Page 10: ...GHT OFF AUTO COMBI CONV BAKE CONV BROIL COMBI BAKE COMBI ROAST FAN HIGH FAN LOW FAN OFF LIGHT HIGH LIGHT NIGHT ROOM TEMP FROZEN TEMP POULTRY 11 12 13 CUSTOM COOK SENSOR COOK SENSOR POPCORN STOP CLEAR 4 N C N C N C N C N C 7 3 4 6 1 CLOCK POWER START 5 0 TIME FISH MEAT N C Figure 3 ...

Page 11: ...k Used for memory entry and memory recall of a cooking program Numbers Used to enter the Time of day Cooking Time Cooking Powers Quantities or weights Hold Warm Used to keep hot cooked foods safely warm in your microwave oven up to 60 minutes Auto Defrost Used to defrost frozen meat poultry and fish Fan Control Pad Used to turn on the fan at high speed or low speed and turn off the fan Light Pad U...

Page 12: ... TIME key and then number keys that correspond to the desired cooking time The remaining time is continuously displayed during cooking 3 POWER Key Used to select cooking power level 4 CLOCK Key Used in setting Time of Day 5 STOP CLEAR Key Used to stop the oven or clear all entries except Time of Day 6 START Key Touch the START key after setting the desired cooking time etc Also touch the START key...

Page 13: ...d 4 mW cm2 And always start measuring of an unknown field to assure safety for operating personnel from radiation leakage NOTE The standard is 5 mW cm2 while in the customer s home 4 mW cm2 stated here is manufactruer s own voluntary standard for units in customer s home EQUIPMENT Electromagnetic energy leakage monitor NARDA 8100B HOLADAY HI 1501 600cc glass beaker Glass thermometer 100 C B MEASUR...

Page 14: ...on the service invoice 2 Should the microwave energy 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 G POWER OUTPUT MEASUREMENT 1 1 Fill two test ...

Page 15: ...LL CIRCUIT DIAGRAM ESPECIALLY SWITCHES AND HIGH VOLTAGE CIRCUIT A REMOVING POWER AND CONTROL CIRCUIT BOARD Figure 7 8 and 9 1 Remove 1 screw securing the control panel assembly to the oven cavity Figure 7 2 Remove the control panel with pushing it upward 3 Remove the three connectors CN1 CN2 CN4 and wire leads Relay from the circuit board 4 Remove 5 screws securing the circuit board Figure 8 5 Rem...

Page 16: ...e 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 12 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 end of the plastic fastener into the ...

Page 17: ...ee screws securing it to the outcase 4 Remove the base plate by removing six screws securing it to the out case Remove two screws securing it to the ventilation motor Asm 5 Remove the power cord cover from outcase by removing a screw 6 Push the power cord to the inner of the outcase and remove the outcase 15 Power Cord Power Cord Cover Out Case Controller Door Vent Grille Mounting Plate Figure 14 ...

Page 18: ...6 Latch Board Secondary Interlock Switch Primary Interlock Switch Interlock Monitor Switch Oven Lamp Switch Figure 16 Latch Board RED From Monitor Switch WHITE From Power Cord Oven Lamp Switch RED From Secondary Switch WHITE From Fan Motor PINK From PCB RED From Magenetron Thermostat RED From PCB WHITE From H V Trans Interlock Monitor Switch PINK From PCB BLUE From PCB BLUE From PCB Primary Interl...

Page 19: ...ng it to the cover glasswool R and guide air Figure 19 9 Remove the guide air by removing three screws securing it to the bottom plate R and guide air Figure 19 10 Remove the guide suction by removing three screws securing it to the bottom plat R oven front plate and magnetron Figure 20 11 Remove four tap tite screws securing the magnetron to the wave guide Figure 21 12 Remove the magnetron VERY C...

Page 20: ...nterlock switch the secondary interlock switch and the interlock monitor and the lamp 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 5 mW cm2 All service adjustments should be made for minimum microwave energy leakages G DISASSEMBLING DOOR Figure 25 1 Remove the dielectric choke by using kn...

Page 21: ...ng three screws securing it to the back plate See Figure 26 2 Remove the two screws securing the ventilation fan asm See Figure 27 3 Carefully pull the ventilation motor asm out of the microwave oven See figure 28 4 Disconnect the wire leads 19 Figure 26 Figure 27 Figure 28 ...

Page 22: ... asm 4 Remove the silicone belt 5 Remove the C motor assy by removing four screws securing it to the guide air and glasswool R cover 6 Remove the thermistor by removing one screw securing the chamber out plater 7 Remove the five screws securing the glasswool L cover chamber assy and glasswool R cover 8 Lift the chamber assy from the oven cavity 9 Remove four screws securing the heater fo the chamb...

Page 23: ... the limit of 4 mW cm2 All service adjustment 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 dielectric choke of the door seal is damaged d The door is bent or warped or there is any other visible...

Page 24: ...with an ohm meter on Rx1 scale 2 Measure the resistance Between each filament terminal of the magnetron and the chassis ground with an ohm meter on highest 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 r...

Page 25: ...finite ohm from the beginning Normal reading Infinite Abnormal reading Indicates continuity Normal reading Continuity Abnormal reading Infinite Normal reading Infinite Abnormal reading continuity Measure the resistance 1 Terminal to terminal Figure 31 a 1 Terminal to case Figure 31 b Measure the continuity 1 Forward Ohm meter on Rx10000 scale Figure 32 a 2 Reverse Figure 32 b Ohm meter Ohm meter O...

Page 26: ... failure of the monitored safety interlock s Be sure to connect the monitor switch after replacement and to check interlock monitor continuity NOTE After checking for the continuity of switches make sure that they are correctly connectly connected Terminals COM and NO of switch Terminals COM and NO of switch Terminals COM and NC of switch Terminals COM and NC of switch Terminals COM and NO of swit...

Page 27: ...ure 35 Measure the resistance with an ohm meter on Rx1 scale Measure the resistance across pins 1 2 an ohm meter on Rx1 scale Figure 36 Figure 37 Normal reading ohms Normal reading Approx 250 350 K ohms at 20 C Normal reading Approx 9 12 ohms at 20 C Normal reading ohms at 20 C YL WH RD 1 2 3 6 5 4 3 2 1 NOTE A MICROWAVE ENERGY TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON...

Page 28: ...easure the resistance with an ohm meter on Rx10000 scale Figure 38 Figure 39 Figure 40 Cooking Start OFF Convection OFF Cooking Start Normal reading Approx 3 4 Kohms 1 3 1 3 9 NOTE A MICROWAVE ENERGY 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 SURE TO GRASP THE CONNECTOR N...

Page 29: ...om relay 2 and operate the unit on microwave cooking mode Figure 41 Check for continuity of relay 9 with an ohm meter Remove wire leads from relay 9 and operate the unit on convection cooking mode Figure 42 STAND BY CONDITION STAND CONDITION RELAY 2 RELAY 9 NOTE A MICROWAVE ENERGY TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POS...

Page 30: ... KEY BOARD CONNECTOR KEY CON B CHECKOUT PROCEDURES 1 CHECKOUT PROCEDURES FOR FUSE BLOWING CAUTION REPLACE BLOWN FUSE WITH 15 AMPERE FUSE NOTES If the fuse is blown by an improper switch operation replace all switches in the interlock circuit and the fuse After replacing the switches with new ones make sure that they are correctly connected Check for microwave engergy leakage according to ADJUSTMEN...

Page 31: ... circuit board Does the unit still operate Defective RELAY 1 PROBLEM B NO YES YES NO Good Replace the circuit board Defective RELAY or poor connection of RELAY Replace RELAY or correct the connection FAN motor and oven lamp turn on when the door is closed and START key is touched Measure the voltage at pin NO 38 of U01 or 12 U03 Voltage reading 0 Vdc Replace RELAY 1 Replace the circuit board ...

Page 32: ...ously 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 when they should not 6 Wrong figures appear 7 The figures of all digits flicker 8 Some of the indicators do not light up 9 The clock does not keep time properly 30 NOTE A MICROWAVE ENERGY LEA...

Page 33: ...A thru C HEAT UP Problems D thru E TEMPERATURE CONTROLLED COOKING Problems F RESULT Replace circuit board Runs 1 PROBLEM B Display does not show correct numbers and or correct indications when programmed Measure resistance of touch key borad after removing connector S1 See page 14 and 28 Normal resistance Resistance incorrect Check contact of connentor S1 Poor contact Replace circuit board Correct...

Page 34: ...Runs Check contact of connector S1 No continuity Normal primary switch Runs Contact OK Poor contact Correct seating Adjust or replace door sensing sensing switch See page 3 CHECK 1 AIR VENTS Resistance incorrect THERMOSTAT Jumper across terminals of THERMOSTAT by using jumper lead Replace fan motor Replace circuit board Normal circuit board Runs Runs Resistance incorrect Replace H V capacitor Norm...

Page 35: ...ontinuity Replace circuit board Correct seating Replace circuit board Normal circuit board Runs Runs Contact OK Poor contact Runs Normal circuit board Normal H V capacitor Contact OK Check contact of connector S1 Normal resistance Check the continuity of H V capacitor See page 23 Abnormal Replace H V diode Runs Runs Normal Replace magnetron Measure resistance of H V transformer See page 22 Check t...

Page 36: ...lace circulation motor Normal circuit board Runs Runs Runs Normal resistance CHECK 1 PRIMARY INTERLOCK SWITCH Check the contact of Relay 9 See page 27 No continuity Replace circuit board Replace heater Normal circuit board Runs Runs Normal resistance Replace thermistor Normal thermistor Normal heater Resistance incorrect Runs CHECK 1 PRIMARY INTERLOCK SWITCH 2 THERMISTOR Replace heater chamber Nor...

Page 37: ...LY 2 FUSE Poor contact Replace thermistor Normal contact Runs Normal thermistor Contact OK Runs Please cool unit sufficiently Correct seating Check contact of 6 pin thermistor connector 1 PROBLEM I No buzzing when touching the key PROBLEM J between stages or at end of cooking Runs Check normal operation circuit board Replace circuit board Normai circuit board ...

Page 38: ... FUSE Check the contact of Magnetron thermostat No contact Replace magnetron thermostat Correct seating Replace circuit board Normal contacting Normal circuit board Runs Runs Runs Poor Contacting Contact OK Runs Contact OK Check contact of connector S1 See page 13 No runs Replace ventilation motor asm Normal ventilation motor asm ...

Page 39: ...DOOR PARTS 37 EXPLODED VIEW 13581A 13552A 13720D 14026A 14970A 34774U 13650A 34774U 13213A 14760A 14890A WSZ153 WTT024 WTT024 WTT024 14760A EV MODEL MV 1155W ...

Page 40: ...CONTROLLER PARTS 38 WTT028 WTT021 WTT021 268711 24810P 26638A 07 23572A 24781M WTT021 EV ...

Page 41: ... 548112 33112U WTT029 WTT021 33550P WTT021 56411A WTT021 WTT021 WTT021 56804A 368771 35230A 948505 WTT022 34890C 34810T 35026G WTT022 53550A 348101 33530A Installation Instruction WTT022 WTT021 WTT021 WTT021 34810Q WTT022 63302A 36912B EV ...

Page 42: ...LATCH BOARD PARTS 40 WSZ085 43500A 466001 466004 466002 43510A 466003 43501A EV ...

Page 43: ...INTERIOR PARTS I 41 55893A 568771 53300C WSZ002 56851D WTP013 WTT021 WSZ002 56324A WSZ137 53300B WTT021 56170D 56930M 54810A WTP004 54810C 56851H 50CZZH WSZ002 WTT021 WTT021 EV ...

Page 44: ...231C WTT021 WTT021 36549V WNZ017 568771 545601 36549C 36549C WTT021 WTP004 56930C WTT021 56820A WTP019 55900A WNZ017 56549F 568772 WTT022 WSZ153 56804A WNZ017 549751 53550L 56912B 55262A WTT029 WTT021 WTT021 546801 WSZ002 WTT021 WTT021 53550A WTT037 54974S EV ...

Page 45: ...INTERIOR PARTS III 43 WTT021 53551S 53551L WSZ002 WSZ002 53551R 568772 WTT021 WTT021 EV ...

Page 46: ...INSTALLATION PARTS 44 WSZ136 WSZ098 WBZZ02 638581 63300M WBZZ01 WBZZ01 65862D 65862B WTP013 64360A WSZ136 63861A 638582 WTT021 EV ...

Page 47: ... CHAMBER ASSY PARTS 45 WNH003 WWS011 545602 WWP008 WTT010 WTT010 WTT011 35300S 34990A WTT011 WMT002 533001 55892A WWP008 WWS011 WNH003 54930A 54281A 533002 54400A WTT021 54810A 55263A 56501A WTT021 948503 EV ...

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