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LG LRMM1430SW Service Manual
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LG LRMM1430SW Service Manual

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See also: Owner's Manual & Cooking Guide
website http://www.lgservice.com

MICROWAVE OVEN

SERVICE MANUAL
MODEL : LRMM1430SW
LRMM1430SB
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

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Summary of Contents for LG LRMM1430SW

  • Page 1: Microwave Oven

    MICROWAVE OVEN SERVICE MANUAL MODEL : LRMM1430SW LRMM1430SB CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Warning To Service Technicians

    CAUTION WARNING TO SERVICE TECHNICIANS PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY a. Do not operate or allow the oven to be operated with the door open. b. Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs as necessary;...

  • Page 3: Table Of Contents

    FOREWORD Read this Manual carefully. Failure to adhere to or observe the information in this Manual may result in exposing yourself to the Microwave Energy normally contained within the oven cavity. MODEL LRMM1430SW LRMM1430SB MECHANICAL SERVICE INFORMATION TABLE OF CONTENTS 1.

  • Page 4: Adjustment Procedures

    1. ADJUSTMENT PROCEDURES ADJUST THE LATCH AND SWITCH CLOSINGS To avoid possible exposure to microwave energy (3) Loosen the screw holding the plastic latch board as leakage, adjust the door latches and interlock switches, shown. using the following procedure. (4) With the oven door closed tightly, move the latch board upward toward the top of the oven and/or away from the ONLY AUTHORIZED SERVICE PERSONNEL door latch until the gaps are less than 1/64”...
  • Page 5 LATCH BOARD SECONDARY INTERLOCK DOOR LATCH SWITCH MONITOR INTERLOCK SWITCH PRIMARY INTERLOCK SWITCH Figure 1-a LATCH 0-1/64" LATCH BOARD Figure 1-b 0-1/64"...

  • Page 6: Precautions On Installation

    2. PRECAUTIONS ON INSTALLATION 4. TRIAL OPERATION (Figure 2) After installation, the following sequences and results A. Plug the power supply cord into a 120 V AC, 60 Hz, should be checked carefully. single-phase power source with a capacity of at least 20 A.
  • Page 7 SPECIFICATIONS Rated Power Consumption 1250W maximum Output 1200W maximum (*IEC 60705 Rating standard) Adjustable 0W through 1200W, 10 steps Frequency 2,450 MHz 50 MHz Power Supply 120V 12V AC, 60Hz Rated Current 11 Amp. Magnetron Cooling Forced Air Cooling Microwave Stirring Turntable Rectification Rectification Voltage Doubler Half-Wave (Inverter type)

  • Page 8: Overall Circuit Diagram

    6. OVERALL CIRCUIT DIAGRAM A. SCHEMATIC DIAGRAM Figure 3...
  • Page 9 B. MATRIX CIRCUIT FOR TOUCH KEY BOARD Figure 4...

  • Page 10: Operating Procedures

    7. OPERATING PROCEDURES A. CONTROL PANEL Figure 5. 1. Display. The Display includes a clock and indicators 10. Q-Defrost. Touch this pad to defrost foods quickly. that tell you time of day, cooking time settings, and 11. More / Less. Touch these pads to adjust cooking cooking functions selected.
  • Page 11 B. PANEL INSTRUCTIONS (Figure 5) (9) STOP/CLEAR Key Used to stop the oven or clear all entries except The entire operation is done by simple touch control pads. CLOCK. (1) Display Window (10) AUTO DEFROST key (DEFROST MEAT, POULTRY, Numbers and letters explained in Figure 5 are shown in FISH &...
  • Page 12 C. EASY USE CHART (1) CLOCK (6) MELT 1. Touch STOP/CLEAR. 1. Touch STOP/CLEAR. 2. Touch CLOCK. 2. Touch MELT. 3. Touch numbers for correct time of day. Four different melt menus are provided. 4. Touch CLOCK. 3. Select Menu 1 to 4- See cooking guide. 4.

  • Page 13: Procedure For Measuring Microwave Energy Leakage

    8. PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE A. CAUTIONS B. MEASURING MICROWAVE ENERGY LEAKAGE (1) Be sure to check a microwave emission prior to (1) Pour 275 15cc of 20 5 ˚C water in a beaker which is servicing the oven if the oven is operative prior to graduated to 600 cc, and place the beaker in the center servicing.
  • Page 14 D. MEASUREMENT WITH A FULLY ASSEMBLED OVEN G. POWER OUTPUT MEASUREMENT Be sure oven cavity is clean and cool . (not used recently) (1) After all components, including the outer panels, are fully assembled, measure for microwave energy (1) Fill the test beaker with 59 ˚F(15 ˚C) ~ 75 ˚F(24 ˚C) 1 liter tap leakage around the door viewing window, the exhaust water.

  • Page 15: Disassembly Instructions

    9. DISASSEMBLY INSTRUCTIONS Remove deco front IMPORTANT NOTES: UNIT MUST BE DISCONNECTED FROM ELECTRICAL OUTLET WHEN MAKING REPAIRS, RE-PLACEMENTS, ADJUSTMENTS AND CONTINUITY CHECKS. WAIT AT LEAST ONE MINUTE, UNTIL THE HIGH VOLTAGE CAPACITOR IN THE HIGH VOLTAGE POWER SUPPLY HAS FULLY DISCHARGED. THE CAPACITOR SHOULD BE DISCHARGED BY USING INSULATED WIRE - I.E.
  • Page 16 C. REMOVING CONTROL CIRCUIT BOARD (Figure 10) D. SEPARATE CAVITY AND BASE PLATE (Figure 11) (1) Remove out case. (1) Remove out case. (2) Remove door assembly. (2) Remove Door Assembly. (3) Unfasten two screws. (3) Remove five screws at the base plate. (4) Lift up and pull out control panel assembly carefully (Front 3 EA, Back 2 EA).
  • Page 17 E. AIR GUIDE REMOVAL (Figure 12) G. SENSOR DUCT REMOVAL (Figure 13) (1) Separate cavity and base plate. (1) Remove out case. (2) Unfasten the screws which hold the air guide in the (2) Unfasten the sensor duct screw. base plate. (3) Disconnect sensor lead wire.
  • Page 18 H. MAGNETRON REMOVAL I. REMOVING THE TURNTABLE MOTOR (1) Disconnect the leadwire from the magnetron. (1) Remove the turntable and turntable roller rest. (2) Carefully remove the mounting screws holding the (2) Lay the unit down on its back. magnetron at the waveguide. (3) Remove the turntable motor cover.
  • Page 19 J. FAN MOTOR ASSEMBLY REMOVAL K. INTERLOCK SYSTEM (1) Separate cavity and base plate. (1) INTERLOCK MECHANISM (2) Remove air and suction guide.. The door lock mechanism is a device which has been (3) Remove the two screws holding the fan motor ASSEMBLY specially designed to eliminate completely microwave to the suction guide ASSEMBLY.

  • Page 20: Interlock Continuity Test

    10. INTERLOCK CONTINUITY TEST WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS. TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF OR V-5230Q FOR PRIMARY SWITCH TYPE NO. SZM-V 16-FA-62 OR VP-532A-OF OR V-5220Q FOR MONITOR SWITCH TYPE NO.

  • Page 21: Test And Checkout Procedures, And Troubleshooting

    11. TEST AND CHECKOUT PROCEDURES, AND TROUBLESHOOTING CAUTIONS 1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASE FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE LEAD WIRES FROM THE INVERTER MODULE. 2.
  • Page 22 COMPONENTS TEST PROCEDURE RESULTS Antenna Gasket Chassis Filament 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. SENSOR Normal: Approximately 1. Disconnect sensor connector from micom BK-RD: 5.2 Kohms computer board.
  • Page 23 COMPONENTS TEST PROCEDURE RESULTS RELAY Check for continuity of relay with an Normal: Approx. ohm-meter. ON: 0 ohm (Remove lead wires from relay and OFF: ohms operate the unit.) Abnormal: Infinite or several ohms. Relay 2 Measure the resistance. FAN MOTOR Normal: Approx.

  • Page 24: Checkout Procedures

    B. CHECKOUT PROCEDURES (1) CHECKOUT PROCEDURES FOR FUSE BLOWING CAUTION: REPLACE BLOWN FUSE WITH 20 AMPERE FUSE. PROBLEMS CAUSES Fuse blows immediately after Improper operation of the primary interlock, the door is closed. secondary interlock switches and/or the interlock monitor switch. Fuse blows immediately after the door is opened.
  • Page 25 (2) CHECKOUT PROCEDURES FOR RELAY - PROBLEM (A) - FAN motor and oven lamp turn on without touching START key when the door is closed. Remove the mate connector of I/O GOOD CON from the circuit board does the unit still operate? Replace the circuit board - PROBLEM (B) -...
  • Page 26 (3) CHECKOUT PROCEDURES FOR CIRCUIT BOARD The following symptoms indicate a defective circuit board. (1) Check the input current. If the input current is more (4) The buzzer does not sound or continues to sound. than 20A, check the magnetron and wiring. If the (5) Some segments of one or more digits do not light input current is less than 0.5 A, there is no input to up, or they continue to light up, or segments light...

  • Page 27: Troubleshooting

    C. TROUBLE SHOOTING WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF THE FOLLOWING SYMPTOMS APPLY, PLEASE INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE MICROWAVE OVEN. THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL. CAUTIONS 1.
  • Page 28 (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.
  • Page 29 (TROUBLE 2) Oven does not operate at all, Display window does not display any figures, and no input is accepted. CONDITION CHECK RESULT CAUSE REMEDY Malfunction of the Replace fuse, Check continuity 1. Fuse blows. Continuity. monitor switch. primary, monitor of monitor switches, and switch (with...
  • Page 30 (TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired program times are set and START pad is touched. CONDITION CHECK RESULT CAUSE REMEDY Defective Replace Check continuity 1. Setting time No continuity. secondary switch. secondary switch.
  • Page 31 (TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run. (Display operates properly) CONDITION CHECK RESULT CAUSE REMEDY No microwave Defective PCB Replace PCB Disconnect the No continuity. oscillation. assembly. assembly. wire leads from relay and check continuity of Replace Inverter Continuity.

  • Page 32: Exploded View

    EXPLODED VIEW INTRODUCTION -31-...

  • Page 33: Door Parts

    DOOR PARTS 13552A 13536A 15006A 13581A 13213A WTP002 14026A WTP002 13551A 14970A 268711 13806A 23506A -32-...

  • Page 34: Controller Parts

    CONTROLLER PARTS WTP002 13551A 268711 23506A -33-...

  • Page 35: Oven Cavity Parts

    OVEN CAVITY PARTS WSZ185 33112U WTT022 :Model LRMM 1430SW W107 :Model LRMM 1430SB 33390G 33052A 35889A 36549S WTP013 13806F 647781 -34-...

  • Page 36: Latch Board Parts

    LATCH BOARD PARTS 43501A WSZ085 466001 43500A 466003 466001 -35-...
  • Page 37 OVEN INTERIOR PARTS WTT021 WTT028 56501A 54974T 56930V 56912B 56324A WSZ002 43500A -36-...

  • Page 38: Base Plate Parts

    BASE PLATE PARTS 56411A WTT028 WTT028 56851H 268712 WTT028 568771 WTT021 WSZ002 WTT034 56549F WTT028 35264A 568711 568772 54974S 55900A 50FZZA 43501A 55238A 56201A 54980A 63302A 65006B -37-...

  • Page 39: Replacement Parts List

    REPLACEMENT PARTS LIST FOR MODEL : LRMM1430SB LOC. PART NO. DESCRIPTION ALTER 3828W5A3194 MANUAL,OWNERS 3828W5S3066 MANUAL,SERVICE 3890W3W376B BOX,WHITE 13213A 3213W0A008B DOOR FRAME ASSEMBLY 13536A 3536W1A002A SEAL TAPE 13552A 3552W0A009A CHOKE COVER 13581A 3581W0A077B DOOR ASSEMBLY 13806F 3806W1A062A DECO,FRONT 14026A 4026W1A025A LATCH 14970A 4970WRA001C...
  • Page 40 LOC. PART NO. DESCRIPTION ALTER WTP002 1TPL0302018 SCREW TAPPING,PAN HEAD WTP013 1TPL0402418 SCREW TAPPING,PAN HEAD WTT021 1TTL0402418 SCREW TAPPING,TRUSS HEAD WTT028 1TTL0402818 SCREW TAPPING,TRUSS HEAD WTT034 1TTL0403418 SCREW TAPPING,TRUSS HEAD R,S: SERVICE PARTS -39-...
  • Page 41 FOR MODEL : LRMM1430SW LOC. PART NO. DESCRIPTION ALTER 3828W5A3340 MANUAL,OWNERS 3828W5S3192 MANUAL,SERVICE 3890W3W377A BOX,WHITE 13213A 3213W0A008C DOOR FRAME ASSEMBLY 13352A 3352W1A144A FRONT SCREEN 13536A 3536W1A002A SEAL TAPE 13552A 3552W0A009A CHOKE COVER 13581A 3581W0A077E DOOR ASSEMBLY 13720D 3720W0D308A PANEL,DOOR 13806F...
  • Page 42 LOC. PART NO. DESCRIPTION ALTER WTP002 1TPL0302018 SCREW TAPPING,PAN HEAD WTP013 1TPL0402418 SCREW TAPPING,PAN HEAD WTT021 1TTL0402418 SCREW TAPPING,TRUSS HEAD WTT022 1TTL0402422 SCREW TAPPING,TRUSS HEAD WTT028 1TTL0402818 SCREW TAPPING,TRUSS HEAD WTT034 1TTL0403418 SCREW TAPPING,TRUSS HEAD R,S: SERVICE PARTS -41-...

  • Page 43: Schematic Diagram Of P.c.b

    SCHEMATIC DIAGRAM OF P.C.B -42-...

  • Page 44: Printed Circuit Board

    PRINTED CIRCUIT BOARD KEY PCB MAIN PCB -43-...

  • Page 45: Parts List

    P.C.B. PARTS LIST LOC. PART NO. DESCRIPTION SPECIFICATION ALTER 0RZ1503G610 RESISTOR,DRAWING 150KOHM 1/4W 5% 3216 BULK 8 PIN 6908W3YA01C BUZZER TFM-57 CW NINGBO EAST PIEZO 2048HZ 70D 6908W3YA01A 0CK1040K948 CAPACITOR,FIXED CERAMIC(HIGH DIELECTRIC) 0.1UF D 50V 80%,-20% F(Y5V) TA26 0CE2276K618 CAPACITOR,FIXED ELECTROLYTIC 220UF SMS,SG 50V 20% FL TP 5 0CE4771J618 CAPACITOR,FIXED ELECTROLYTIC...
  • Page 46 LOC. PART NO. DESCRIPTION SPECIFICATION ALTER 0DD414809AA DIODE,SWITCHING 1N4148 ROHM TP26 DO35 100V 450MA 2A 3NS 0DD414809AB DIODE 1N4148M PYUNG CHANG TP26 DO34 60V 0.5A 0 0DD414809AB DIODE 1N4148M PYUNG CHANG TP26 DO34 60V 0.5A 0 0DD414809AB DIODE 1N4148M PYUNG CHANG TP26 DO34 60V 0.5A 0 0DD414809AB DIODE 1N4148M PYUNG CHANG TP26 DO34 60V 0.5A 0...
  • Page 47 47K OHM 1/6 W 5% TA26 6920W2D010A RELAY OJ-SS-112LM OEG 250VAC 3A 12VDC 1A NO VE 6920W2D010B 6920W5A012A RELAY G5G-1A-DT1-LG OMRON 250VAC 16A 12VDC 1A 0IZZW5A191B IC,DRAWING TMP87CM14N 64SDIP BK MS-1443ASV LGEUS MO 0IKE455800A IC,LINEAR KIA4558P KEC 8DIP BK LIN OPAMP...
  • Page 48 May, 2003 P/NO : 3828W5S3066 Printed in Korea...

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