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Internal Use Only
Website http://biz.lgservice.com
MICROWAVE OVEN
SERVICE MANUAL
MODEL: LCRT2010ST
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
November, 2010
P/NO : MFL06272518 Printed in Korea
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SAFETY PRECAUTIONS This device is to be serviced only by properly qualified service personnel. Consult the service manual for proper service procedures to assure continued safety operation and for precautions to be taken to avoid possible exposure to excessive microwave energy. 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
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CONTENTS (Page) SAFETY PRECAUTIONS --------------------------------------------------------------------- Inside front cover SPECIFICATIONS ----------------------------------------------------------------------------------------------------- 1-1 CAUTIONS -------------------------------------------------------------------------------------------------------------- 2-1 INSTALLATIONS ------------------------------------------------------------------------------------------------------ 3-1 OPERATING
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SPECIFICATIONS ITEM DESCRIPTION Model LCRT2010ST Power Requirement 120 V~ 60 Hz 1650 watt (14.0 A) Single phase, 3 wire grounded Power Output 1200 watt full microwave power (IEC60705) Microwave Frequency 2450 MHz Magnetron 2M246 - 050GF Timer 0 ~ 9 min. 99 sec. 7 9 13 Outside Dimensions 23 / ” (W) x 13 / ” (H) x 19 / ” (D) 8 16 16 11 1 1 Cavity Dimensions 16 / ” (W) x 11 / ” (H) x 18 / ” (D) 16 4 16 Net Weight 18Kg Shipping weight 20Kg Control Complement Touch Control System Clock : 1:00 - 12:59
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CAUTIONS Unlike other appliances, the microwave oven is MICROWAVE RADIATION high-voltage and high-current equipment. Personnel should not be exposed to the Though it is free from danger in ordinary use, microwave energy which may radiate from the extreme care should be taken during repair. magnetron or other microwave generating device if it is improperly used or connection. • DO NOT operate on a 2-wire extension cord during All input and output microwave connections, repair and use. waveguide,
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INSTALLATIONS BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY. INSTALLING GROUNDING INSTRUCTIONS 1. Empty the microwave oven and clean inside it with For personal safety,this appliance must be fully a soft, damp cloth. Check for damage such as grounded at all times. misaligned door, damage around the door or dents In the event of an electrical short circuit, grounding inside the cavity or on the exterior. reduces the risk of electrical shock. The plug must be plugged i
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OPERATING INSTRUCTIONS FEATURES Roller rest CONTROL PANEL 1. DISPLAY : The display includes a clock and indicators that tell you time of day, cooking time settings, and cooking functions selected. 2. SENSOR TOUCH : This pad allows you to cook most of your 1 favorite foods without having to select cooking times and power levels. 3. AUTO COOK : Touch this pad to select programming food items. 4. CUSTOMSET: Touch this pad to select sound(on/off), clock(on/off), scroll speed(slow,normal, fast) and
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OPERATING SEQUENCE The following is a description of component functions 8. CHILD LOCK during oven operation. This oven has a CHILD LOCK feature TO SET CHILD LOCK 1. SETTING THE CLOCK • Touch pad STOP/CLEAR • Touch and hold pad LOCKED STOP/ Set the START/ENTER CLOCK START CLEAR correct hour appears on the display. Set the TO CANCEL CHILD LOCK START correct minute • Touch and hold pad LOCKED START/ENTER NO
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SCHEMATIC DIAGRAM 4-3
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CIRCUIT DESCRIPTION GENERAL DETAILS • A high voltage of approximately 2100 volts AC is • The low voltage transformer supplies the necessary generated in the secondary of the high voltage voltage to the micom controller when power cord is transformer which is increased by the action of the high plugged in. voltage diode and charging of the high voltage • When the door is closed, the primary switch is ON, the capacitor. secondary switch is ON, and the monitor switch opens • The negative 4,000 Volt
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SERVICE INFORMATION TOOLS AND MEASURING INSTRUMENTS NECESSARY TOOLS NECESSARY MEASURING INSTRUMENTS Tools normally used for TV servicing are sufficient. • TESTER (VOLTS-DC, AC, Ohmmeter) Standard tools are listed below. • Microwave survey meter - Holaday HI-1500 • Diagonal pliers HI-1501 • Long nose pliers - Narda 8100 • Phillips screwdriver 8200 • Flat blade screwdriver • Inch scale • Wrench (size 5mm) • 600 cc non conductive material beaker (glass or plastic), • Nutdriver (size 5mm) 1 • Ad
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MEASUREMENT WITH OUTER CASE NOTES WHEN MEASURING REMOVED • Do not exceed meter full scale deflection. • The test probe must be removed no faster than • When you replace the magnetron, measure for 1 inch/sec (2.5 cm/sec) along the shaded area, microwave energy leakage before the outer case is otherwise a false reading may result. installed and after all necessary components are • The test probe must be held with the grip portion of the replaced or adjusted. handle. Special care should be taken
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MEASUREMENT OF MICROWAVE POWER OUTPUT • Microwave power output measurement is made with • The microwave power output P in watts is calculated the microwave oven supplied at its rated voltage and from the following formula : operated at its maximum microwave power setting with 4187 x (∆ T) + 0.55 X (T2 - T0 ) X M P = a load of (1000±5) g of potable water. T • The water is contained in a cylindrical borosilicate glass • T2: Temperature after heating vessel having a maximum material thickness of 3
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Remove choke cover D. PCB ASSEMBLY REMOVAL 1) Remove the control panel assembly from the cavity. (Refer to control panel assembly removal on previous page.) 2) Remove screws which hold the PCB SUB ASS’Y to the control panel. 3) Disconnect the flat cable from the PCB SUB ASS’Y and take off the PCB SUB ASS’Y Remove door Assembly E. DOOR MAIN ASSEMBLY / REMOVAL 1) Open the door. 2) Remove the choke cover very carefully with a flat-blade screwdriver. CAUTION: Be careful not to damage door seal plate
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F. AIR DUCT ASSEMBLY / REMOVAL G. REMOVING SENSOR 1) Disconnect the leadwire from PCB Assembly. 1) Disconnect the leadwire from lamp. 2) Remove a screw securing the sensor duct. 2) Remove the mounting screw to the magnetron. G. MAGNETRON REMOVAL 1) Disconnect the leadwire from themagnetron. 2) Carefully remove the mounting screws holding the magnetron to the waveguide. 3) Remove the magnetron ASS’Y until the tube is clear from the waveguide. NOTE: 1. When removing the magnetron, make sure its do
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H. REMOVING THE TURNTABLE MOTOR I. HIGH VOLTAGE TRANSFORMER 1) Remove the turntable and rotating ring. REMOVAL 2) Lay the unit down on its back. 1) Discharge the high voltage capacitor. 3) Remove the turntable motor cover. 2) Disconnect the leadwire from magnetron, high voltage The turntable base cover is easily removed by transformer, and capacitor. pinching the eight parts with a wire cutting. 3) Remove the screw holding the high voltage transformer 4) Disconnect the leadwire from the turntabl
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L. INTERLOCK SYSTEM 1) INTERLOCK MECHANISM The door lock mechanism is a device which has been specially designed to eliminate completely microwave activity when the door is opened during cooking and thus to prevent the danger resulting from the microwave leakage. ADJUSTMENT DIRECTION PRIMARY SWITCH MONITOR SWITCH SECONDARY SWITCH 2) MOUNTING OF THE PRIMARY/MONITOR/ SECONDARY SWITCHES TO THE LATCH BOARD 3) INSTALLATION AND ADJUSTMENT OF THE LATCH BOARD TO THE OVEN ASSEMBLY • Mount the latch board
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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.SZM-V 16-FA-63 OR VP-533A-OF OR V-5230Q FOR SECONDARY SWITCH A. PRIMARY INTERLOCK SWITCH TEST B. SECONDARY INTERLOCK SWITCH TEST Disconnect the wire lead from the secondary When the door release button is depress
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COMPONENT TEST PROCEDURE 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 WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER. (SEE PAGE 2-1) 2. ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD (1 LITER OF WATER IN CONTAINER) IN THE OVEN. COMPONENTS TEST PROCEDURE RESULTS HIGH VOLTAGE TRANSFORMER (Wire leads remo
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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. HIGH VOLTAGE Measure the resistance. Normal: Momentarily indicates CAPACITOR (Ohm-meter scale: Rx1000) several ohms, and • Terminal to terminal. then gradually returns to infinite. Measure the resistance. Normal: Infinite. (Ohm-meter scale: Rx1000) • Terminal to case. HIGH VOLTAGE Meas
