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Summary of Contents for Goldstar MA-2005ST
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Page 1: Microwave Oven
MICROWAVE OVEN SERVICE MANUAL MODEL : MA-2005ST CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. http://www.LGEservice.com E-mail:Techsupport@LGEservice.com... -
Page 2: 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. - Page 3 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. They are also extremely efficient in their use of electricity because a microwave oven heats only the food - nothing else.
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Page 4: Grill Cooking
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 5 2-2. Installation & Utensils (1/2) 1. Installation 1. Unpack your oven and place it on a flat level surface. 2. Place your oven in the level location of tour choice with more than 85cm height but make sure there is at least 30cm of space on the top and 10cm at the rear for proper ventilation.
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Page 6: Cooking Utensils
2. Paper napkins, towels, plates, cups, cartons, and cardboard can be used in the microwave oven. Do not use recycled paper products since they may contain impurities which may cause sparks and/or fires when used in cooking. (Consult your cookbook for correct use of these products.) - Page 7 The Microwave oven cook food using these characteristics. Generally, the food, whether it is large or small has humidity. So if you put this food in the microwave oven and it gets the electric wave, so the energy of it is absorbed in the food since it set up a vibration of the molecules with a frequency two billion four hundred and fifty million times per second.
- Page 8 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 9 FOOD! WAVE FIRE! • If you give microwave to food with the microwave oven, the food and molecules of the water included in the food is turned, or moved and generates heat with the friction among the the molecules. * The water, the oil and the foods shall absorb the electric wave well.
- Page 10 4-1. Construction of microwave oven Cavity Cabinet locking in microwave and holding food. Door Gate coming in and out food. It has window and seal structure Controller Control and supervise DOOR PARTS operating state of oven. BASE PLATE PARTS LATCH BOARD PARTS...
- Page 11 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.
- Page 12 4-3. WARNING - High voltage circuit ( 4,000 volt ) INPUT INPUT SENONDARY SENONDARY WINDING AT WINDING AT 2000V 2000V INPUT INPUT SECONDARY WINDING AT 2000V * 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 13 FILAMENT TERMINALS FEED THROUGH CAPACITOR FILTER CASE FILTER * The magnetron is the energy source for the microwave oven. The magnetron is a vacuum tube of special construction. ANTENNA It is basically a diode with addition of a magnetic field.
- Page 14 4-4. Microwave generation system_Magnetron (2/2) 2,450 MHz. ANTENNA ELECTRONS ANODE TESTING MAGNETRON TUBE * Disconnect power, remove the wrapper, and discharge the capacitor. * Remove the two leads from the magnetron terminals. * Connect the ohmmeter between one terminal of the magnetron and the outer case of the magnetron. If the ohmmeter reads infinity, go to below.
- Page 15 5-1. Multiwave system What is Multi-Wave • The multi-Wave system heats food more evenly than convectional microwave ovens. - 20 -...
- Page 16 What’s the infrared sensor? You may be annoyed when you defrost or reheat food with microwave oven. If you reheat soup, the result is superficial. The surface is hot but inside of the soup is still cold. You have to set the clock and push “Start” again. The cooking time is much longer than you expected.
- Page 17 5-3. Auto moving heater What’s does move automatically? Conventional microwave oven with grill has a heater on the ceiling of cooking room. Whether you cook a pizza or chicken, the position of heater is unmovable. We changed the old way.
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Page 18: Specifications
1 (Warm)--------------------------approx. 10% Nameplate Location Accessories Owner's manual & cooking guide Glass turntable Rotating ring This microwave oven is designed for household use only. It is not recommended for commercial purposes. SPECIFICATIONS DESCRIPTION ” (W) x 13 ” (H) x 18 ”... -
Page 19: Control Panel
OPERATING INSTRUCTIONS FEATURES Window Door Screen Door Seal CONTROL PANEL 1150W Oven Front Plate Display Window Control Panel Door Open Button Safety Door Lock System Turntable Rotating Ring 1. DISPLAY WINDOW. 2. ONE TOUCH CONTROL: This menu has been pre programmed to cook food automatically by one touch. -
Page 20: Operating Sequence
OPERATING SEQUENCE The following is a description of component functions during oven operation. 1. SETTING THE CLOCK STOP/CLEAR CLOCK ex.) To set 4:30, touch number key [4],[3], and [0]. NOTE: 1) This is a 12 hour clock. 2) Clock will operate as long as power is applied to the oven. -
Page 21: Schematic Diagram
SCHEMATIC DIAGRAM... -
Page 22: Circuit Description
¥ The micom controller controls the ON-OFF time of relay 2 by the applied signal to vary the average output power of microwave oven as POWER LEVEL. (refer to page 1-1) ¥ One complete cycle of relay 2 is 22 seconds. -
Page 23: Service Information
¥ Check for microwave leakage after every servicing. The power density of the microwave radiation leakage emitted by the microwave oven should not exceed 4 mW/cm . Always start measuring of an unknown field to assure safety for operating personnel from radiation leakage. - Page 24 MEASUREMENT WITH OUTER CASE REMOVED ¥ When you replace the magnetron, measure for microwave energy leakage before the outer case is installed and after all necessary components are replaced or adjusted. Special care should be taken in measuring the following parts. (Circled area of Fig. below) - Around the magnetron - The waveguide WARNING : AVOID CONTACTING ANY...
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Page 25: Measurement Of Microwave Power Output
MEASUREMENT OF MICROWAVE POWER OUTPUT ¥ Microwave power output measurement is made with the microwave oven supplied at its rated voltage and operated at its maximum microwave power setting with a load of (1000±5) g of potable water. ¥ The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190mm. -
Page 26: Pcb Assembly Removal
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 ASSÕY to the control panel. 3) Disconnect the flat cable from the PCB SUB ASSÕY and take off the PCB SUB ASSÕY Control Panel Key Membrane... -
Page 27: Magnetron Removal
F. AIR DUCT ASSEMBLY REMOVAL 1) Disconnect the leadwire from the lamp. 2) Remove the mounting screw to the magnetron. G. MAGNETRON REMOVAL 1) Disconnect the leadwire from the magnetron. 2) Carefully remove the mounting screws holding the magnetron and the waveguide. 3) Remove the magnetron ASSÕY until the tube is clear from the waveguide. -
Page 28: Diode Removal
I. HIGH VOLTAGE TRANSFORMER REMOVAL 1) Discharge the high voltage capacitor. 2) Disconnect the leadwire from magnetron, high voltage transformer, and capacitor. 3) Remove the screw holding the high voltage transformer to the baseplate. J. FAN MOTOR ASSEMBLY REMOVAL 1) Discharge the high voltage capacitor. 2) Disconnect the leadwire from fan motor and high voltage capacitor. -
Page 29: Interlock Continuity Test
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. SZM-V 16-FA-63 OR VP-533A-OF FOR SECONDARY SWITCH A. -
Page 30: Component Test Procedure
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 31: High Voltage Capacitor
COMPONENTS HIGH VOLTAGE CAPACITOR HIGH VOLTAGE DIODE NOTE : Some inexpensive meters may indicate infinite resistance in both direction. TEST PROCEDURE 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. Measure the resistance. - Page 32 COMPONENTS RELAY 2 FAN MOTOR (Wire leads removed) TURNTABLE MOTOR (Wire leads removed) NOTE : ¥ A MICROWAVE LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON. ¥ MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION. ¥...
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Page 33: Troubleshooting
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. Check grounding before checking for trouble. - Page 34 (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 35 (TROUBLE 2) Oven does not operate at all, Display window does not display any figures, and no input is accepted. CONDITION CHECK Check continuity 1. Fuse blows. of monitor switch (with door closed). Replace fuse Check continuity of primary switch (with door opened).
- Page 36 (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 Check continuity 1. Setting time of secondary does not count switch (with down when door closed).
- Page 37 (TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run. (Display operates properly) CONDITION CHECK No microwave Disconnect the oscillation. wire leads from relay 2 and check continuity of relay 2. (Operate the unit) Check high vol- tage transformer Check high vol- tage capacitor.
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Page 38: Exploded View
EXPLODED VIEW INTRODUCTION OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS DOOR PARTS LATCH BOARD PARTS CONTROL PANEL PARTS... -
Page 39: Door Parts
DOOR PARTS 13581A 13552A 13536A 13213A 13352A 13720D 14026A 14970A... -
Page 40: Controller Parts
CONTROLLER PARTS 268711 WTT028 23572A 26638A WTP018 23550D 24510L 24970A 250201 24781M... -
Page 41: Oven Cavity Parts
OVEN CAVITY PARTS 33112U WSZ185 948503 340511 33052M WTT020 33390G 34036W 35889A 36549S WTP013... -
Page 42: Latch Board Parts
LATCH BOARD PARTS 43501A WSZ085 466001 43500A 466003 466001... -
Page 43: Interior Parts
INTERIOR PARTS WSZ002 568771 56411A 50FZZA 56930V 34930W WSZ085 WTT028 55006F 56549F 54974S WSZ002 55900A WTT037 WSZ002 WSZ002 50CZZH 56851D 56912B WSZ002 55262A 948502 54810C WTT028 56324A WSZ002... -
Page 44: Base Plate Parts
BASE PLATE PARTS 63303L 63302L 56170D 63303R 63302R 948501 WTT021 WTT021 65006B 65006B WSZ002... -
Page 45: Schematic Diagram Of P.c.b
SCHEMATIC DIAGRAM OF P.C.B. -
Page 46: Printed Circuit Board
PRINTED CIRCUIT BOARD...
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