Table of Contents
Related Manuals for LG GoldStar MA-2003B
Summary of Contents for LG GoldStar MA-2003B
- Page 1 All manuals and user guides at all-guides.com http://www.LGEservice.com E-mail:Techsupport@LGEservice.com MICROWAVE OVEN SERVICE MANUAL MODEL : MA-2003B/2003W CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
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Page 2: Safety Precautions
All manuals and user guides at all-guides.com 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... -
Page 3: Table Of Contents
All manuals and user guides at all-guides.com CONTENTS (Page) SAFETY PRECAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Inside front cover SPECIFICATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1 CAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-1 INSTALLATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-1... -
Page 4: Specifications
All manuals and user guides at all-guides.com SPECIFICATIONS ITEM DESCRIPTION MA-2003B MODEL 120 Volts AC 60 Hz Power Requirement 1,550 Watts (13.6 A) Single phase, 3 wire grounded 1,150 Watts full microwave power (IEC705) Power Output 2,450 MHz Microwave Frequency 2M246, 2M248J Magnetron 0 ~ 99 min. -
Page 5: Cautions
All manuals and user guides at all-guides.com 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. -
Page 6: Installations
All manuals and user guides at all-guides.com 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. -
Page 7: Operating Instructions
All manuals and user guides at all-guides.com OPERATING INSTRUCTIONS FEATURES Oven Front Plate Window Door Screen Door Seal Display Window Control Panel Door Open Button Safety Door Lock System Turntable Rotating Ring CONTROL PANEL 1. INDICATORS. 2. ONE TOUCH CONTROL: This menu has been pre programmed to cook food automatically by one touch. -
Page 8: Operating Sequence
All manuals and user guides at all-guides.com OPERATING SEQUENCE The following is a description of component functions 7. AUTO DEFROST COOKING during oven operation. AUTO NUMBER OF START STOP/CLEAR WEIGHT DEFROST 1. SETTING THE CLOCK 8. CHILD LOCK STOP/CLEAR CLOCK NUMBER CLOCK This oven has a CHILD LOCK feature... -
Page 9: Schematic Diagram
All manuals and user guides at all-guides.com SCHEMATIC DIAGRAM... -
Page 10: Circuit Description
All manuals and user guides at all-guides.com CIRCUIT DESCRIPTION • A high voltage of approximately 2100 volts AC is GENERAL DETAILS generated in the secondary of the high voltage • The low voltage transformer supplies the necessary transformer which is increased by the action of the high voltage to the micom controller when power cord is voltage diode and charging of the high voltage plugged in. -
Page 11: Service Information
All manuals and user guides at all-guides.com 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 •... - Page 12 All manuals and user guides at all-guides.com 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.
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Page 13: Measurement Of Microwave Power Output
All manuals and user guides at all-guides.com 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) a load of (1000±5) g of potable water. - Page 14 All manuals and user guides at all-guides.com D. PCB ASSEMBLY REMOVAL Remove choke cover 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.
- Page 15 All manuals and user guides at all-guides.com F. AIR DUCT ASSEMBLY REMOVAL H. REMOVING THE TURNTABLE MOTOR 1) Remove the turntable and rotating ring. 1) Disconnect the leadwire from the lamp. 2) Lay the unit down on its back. 2) Remove the mounting screw to the magnetron. 3) Remove the turntable motor cover.
- Page 16 All manuals and user guides at all-guides.com I. HIGH VOLTAGE TRANSFORMER L. INTERLOCK SYSTEM 1) INTERLOCK MECHANISM REMOVAL The door lock mechanism is a device which has 1) Discharge the high voltage capacitor. been specially designed to eliminate completely 2) Disconnect the leadwire from magnetron, high voltage microwave activity when the door is opened during transformer, and capacitor.
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Page 17: Interlock Continuity Test
All manuals and user guides at all-guides.com 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 FOR PRIMARY SWITCH TYPE NO. SZM-V 16-FA-62 OR VP-532A-OF FOR MONITOR SWITCH TYPE NO. -
Page 18: Component Test Procedure
All manuals and user guides at all-guides.com 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. - Page 19 All manuals and user guides at all-guides.com 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.
- Page 20 All manuals and user guides at all-guides.com COMPONENTS TEST PROCEDURE RESULTS RELAY 2 Check for continuity of relay 2 with an POWER ohm-meter. LEVEL (Remove wire leads from relay 2 and operate the unit.) 4 sec 18 sec 6 sec 16 sec 8 sec 14 sec...
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Page 21: Trouble Shooting
All manuals and user guides at all-guides.com 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 22 All manuals and user guides at all-guides.com (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.
- Page 23 All manuals and user guides at all-guides.com (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.
- Page 24 All manuals and user guides at all-guides.com (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.
- Page 25 All manuals and user guides at all-guides.com (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.
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Page 26: Exploded View
All manuals and user guides at all-guides.com EXPLODED VIEW INTRODUCTION OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS DOOR PARTS LATCH BOARD PARTS CONTROL PANEL PARTS... - Page 27 All manuals and user guides at all-guides.com DOOR PARTS 13581A 13552A 13536A 13213A 14026A 14970A 13352A 13720D...
- Page 28 All manuals and user guides at all-guides.com CONTROLLER PARTS 24781M 268711 23572A 23550D 26638A WTP018 24510L 24970A 250201...
- Page 29 All manuals and user guides at all-guides.com OVEN CAVITY PARTS 33112U WTT021 948503 340511 33052M WTT010 33390G 34036W 35889A 36549S WTP013...
- Page 30 All manuals and user guides at all-guides.com LATCH BOARD PARTS 43501A WSZ085 466001 43500A 466003 466001...
- Page 31 All manuals and user guides at all-guides.com INTERIOR PARTS WSZ002 568771 56411A 50FZZA 56930V 34930W WTT028 55006F 56549F 54974S WSZ002 55900A WTT037 WSZ002 WSZ002 50CZZH 56851D 56912B WSZ002 55262A 948504 54810C WTT028 56324A WSZ002...
- Page 32 All manuals and user guides at all-guides.com BASE PLATE PARTS 56170D 63302L 948501 63302R WSZ002 65006B 63303L WTT021 63303R...
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Page 33: Schematic Diagram Of P.c.b
All manuals and user guides at all-guides.com SCHEMATIC DIAGRAM OF P.C.B. -
Page 34: Printed Circuit Board
All manuals and user guides at all-guides.com PRINTED CIRCUIT BOARD... - Page 35 All manuals and user guides at all-guides.com 2-1. Function & Type (1/2) 1. How a Microwave Oven Works The microwave oven is one of the great inventions of the 20th century - millions of homes in world have one. Microwave ovens are popular because they cook food incredibly quickly.
- Page 36 All manuals and user guides at all-guides.com 2-1. Function & Type (2/2) 2) GRILL COOKING This is a method of cooking with radiant heat from the grill heater on the top of the oven. This is a traditional way of cooking which quickly seals and browns food evenly.
- Page 37 All manuals and user guides at all-guides.com 2-2. Installation & Utensils (1/2) 1. Installation 5. Fill a microwave safe container 1. Unpack your oven and place it on a flat level surface. with 300 ml (1/2 pint) of water. 2. Place your oven in the level location of tour choice with more Place on the GLASS TRAY and than 85cm height but make sure there is at least 30cm of space close the oven door.
- Page 38 All manuals and user guides at all-guides.com 2-2. Installation & Utensils (2/2) 2.COOKING UTENSILS 3.Plastic dishes, cups, freezer bags, and plastic wraps may be Utensils should be checked to ensure that they are suitable for use used in the microwave oven. Follow the manufacturer’s in the microwave oven.
- Page 39 All manuals and user guides at all-guides.com 3-1. What’s the microwave? (1/2) 1. History of dielectric heating In 1945, Dr. Spencer working for RAYTHEON Co. in the U.S.A found out a pieces of chocolate in his pocket melting suddenly by the electric wave (ultra high frequency wave using for radar) on his experiment for radar.
- Page 40 All manuals and user guides at all-guides.com 3-1. What’s the microwave? (2/2) 3. The safety of microwave oven Since the microwave oven can’t make the native fire like gas, you have no use for worrying about the fire. Because it doesn’t become hot like the ordinary electric range. It has been used in the dinner car of the trains etc. Microwave oven has the shielded structure strictly with metal case not to leak electric wave at once not only using but on opening the door.
- Page 41 All manuals and user guides at all-guides.com 3-2. Conventional heating vs. dielectric heating 2. Dielectric heating 1. Conventional heating 1) The heating is uniform. FIRE! FIRE! FIRE! 2) The temperature rise is fast (high). 3) If you break the electric power: The microwave oven stops FIRE! FIRE! HEAT!
- Page 42 All manuals and user guides at all-guides.com 4-1. Construction of microwave oven Cavity Cabinet locking in microwave and holding food. Door Gate coming in and out food. Magnetron It has window Inject microwave and seal to oven. structure OVEN CAVITY PARTS Controller INTERIOR PARTS Control and...
- Page 43 All manuals and user guides at all-guides.com 4-2. How does the microwave oven operate? After plugging your oven into a standard household socket, press start button or turn the timer. And then switches (primary, secondary, timer) close the circuit. Eventually the input power will be applied to turntable motor, timer motor, fan motor, oven lamp and high voltage transformer. A high voltage of 2,100 volts AC is generated in the second winging of H.V.Transformer.
- Page 44 All manuals and user guides at all-guides.com 4-3. WARNING - High voltage circuit ( 4,000 volt ) * The half-wave voltage doubler circuit consists of the secondary winding of the high voltage transformer, H.V. diode (rectifier), and H.V. capacitor. The H.V.
- Page 45 All manuals and user guides at all-guides.com 4-4. Microwave generation system_Magnetron (1/2) GASKET ANTENNA (OUTPUT) FILAMENT (CATHODE) MAGNET (MAGNETIC CIRCUIT) ANODE MAGNET (FERRITE) VANE FILAMENT TERMINALS FEED THROUGH CAPACITOR FILTER CASE FILTER * The magnetron is the energy source for the microwave oven. ANTENNA The magnetron is a vacuum tube of special construction.
- Page 46 All manuals and user guides at all-guides.com 4-4. Microwave generation system_Magnetron (2/2) * In order to create an electron flow from cathode to anode, the cathode must be heated and a potential difference must exist between the two. 2,450 MHz. This is accomplished by heating the cathode with 3, 4 to 3,5 V AC.
- Page 47 All manuals and user guides at all-guides.com 5-1. Multiwave system What is Multi-Wave • The multi-Wave system heats food more evenly than convectional microwave ovens. - 20 -...
- Page 48 LG microwave oven reduce cooking time. Our revolutionary Infrared sensor makes it 3 times faster than the ordinary microwave. Infrared eye tracks the exact temperature of food and regulates the power of the microwave so that the temperature reaches you actually set.
- Page 49 We changed the old way. LG heater is moving when you choose grill, the heater goes down. The angle of heater varies as to each menu. You don’t have to worry about safety. The heater moves back to it’s position automatically after grilling.