Related Manuals for LG GoldStar MS-133SE
Summary of Contents for LG GoldStar MS-133SE
- Page 1 http://www.LGEservice.com E-mail:Techsupport@LGEservice.com MICROWAVE OVEN SERVICE MANUAL MODEL : MS-133SE CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
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Page 2: Safety Precautions
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
CONTENTS (Page) SAFETY PRECAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Inside front cover SPECIFICATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1 CAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-1 INSTALLATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-1... -
Page 4: Specifications
SPECIFICATIONS ITEM DESCRIPTION MS-133SE MODEL 120 Volts AC 60 Hz Power Requirement 1,500 Watts Single phase, 3 wire grounded 1100 Watts full microwave power (IEC705) Power Output 2,450 MHz Microwave Frequency 2M246/2M248 Magnetron 0 ~ 99 min. 99 sec. Timer "... -
Page 5: Cautions
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. -
Page 6: Installations
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
OPERATING INSTRUCTIONS FEATURES Oven Front Plate Window Door Screen Door Seal Display Window Control Panel Door Open Button Safety Door Lock System Turntable Grill Rack Rotating Ring CONTROL PANEL 1100W Defrost Sensor Touch Reheat Defrost Ground Potato Beverage Meat Fresh Frozen Frozen Vegetable... -
Page 8: Operating Sequence
OPERATING SEQUENCE 7. AUTO COOKING The following is a description of component functions during oven operation. AUTO NUMBER STOP/CLEAR COOK 1. SETTING THE CLOCK 8. CHILD LOCK STOP/CLEAR CLOCK NUMBER STATRT This oven has a CHILD LOCK feature TO SET CHILD LOCK ex.) To set 4:30, touch number key [4],[3], and [0]. - Page 9 IMPORTANT SAFETY NOTE: THE SHADED AREAS ON THIS SCHEMATIC DIAGRAM INCORPORATE SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM MICROWAVE RADIATION, FIRE, ELECTRICAL SHOCK, AND HAZARDS. WHEN SERVICING IT IS ESSENTIAL THAT ONLY MANUFACTURER'S SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SHADED AREAS OF THE SCHEMATIC DIAGRAM. NOTICE: SINCE THIS IS BASIC SCHEMATIC DIAGRAM, THE VALUES OF COMPONENTS AND SOME PARTIAL CONNECTIONS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.
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Page 10: Circuit Description
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
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 • Diagonal pliers - Holaday HI-1500 • Long nose pliers HI-1501 •... - Page 12 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
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 D. PCB ASSEMBLY REMOVAL Remove choke cover cap 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 Control Panel PCB Sub Asm...
- Page 15 G. MAGNETRON REMOVAL 3) Remove the screw holding the high voltage transformer to the base-plate. 1) Disconnect the leadwire from the magnetron. 2) Carefully remove the mounting screws holding the I. FAN MOTOR ASSEMBLY REMOVAL magnetron and the waveguide. 3) Remove the magnetron Ass’y until the tube is clear 1) Discharge the high voltage capacitor.
- Page 16 K. REMOVING THE TURNTABLE MOTOR L. INTERLOCK SYSTEM 1) Remove the glass turntable. 1) INTERLOCK MECHANISM 2) Remove the rotating ring ass’y by hand. The door lock mechanism is a device which has 3) Remove the turntable motor cover. been specially designed to eliminate completely The turntable base cover is easily removed by microwave activity when the door is opened during pinching the six parts with wire cutting pliers.
- Page 17 M. INFRARED SENSOR 1) Remove the screw of the back and on the cavity. 2) Remove the screw of the holder. 3) Remove the Holder. 4) Remove the screw of sensor case. 5) Remove the sensor PCB Ass’y 6) Remove the reflector. Sensor Case Holder Reflector...
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Page 18: 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 B. -
Page 19: 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 20 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...
- Page 21 COMPONENTS TEST PROCEDURE RESULTS Check for continuity of relay 2 with an RELAY 2 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 10 sec 12 sec 12 sec 10 sec...
- Page 22 COMPONENTS TEST PROCEDURE RESULTS RELAY 1 OF P.C.B. Cooking Start (Disconnect the 5 pin connector from P.C.B) See Schematic Diagram on page 4-3) RY1: Turn table, Fan Motor, Oven Lamp SENSOR Measure the resistance. Port Resistance (Wire leads removed) 1 and 2 Approx.
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Page 23: Trouble Shooting
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. Check grounding before checking for trouble. 2. - Page 24 (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 25 (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. primary, monitor, monitor switch. of monitor secondary switch (with...
- Page 26 (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 27 (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 2 and check continuity Continuity.
- Page 28 (TROUBLE 6) Uneven cooking and error during sensor cook and temperature process. TEST PROCEDURE CONDITION CAUSE OR CORRECTION Remove the dirt from the Uneven cooking Dirt on the sensor filter filter. Check and adjust the “Guide sensor” stuck. “Guide sensor” Use suitable utensil.
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Page 29: Exploded View
EXPLODED VIEW INTRODUCTION OVEN CAVITY PARTS SUCTION GUIDE PARTS INTERIOR PARTS BASE PLATE PARTS DOOR PARTS LATCH BOARD PARTS CONTROL PANEL PARTS... - Page 30 DOOR PARTS 15006A 13552A 13536A 13213A 14026A 14970A 13352A 13720D 13581A...
- Page 31 CONTROL PANEL PARTS 268711 WTT028 23572A 26638A WTP018 24510L 24970A 250201 24781M...
- Page 32 OVEN CAVITY PARTS 33112U WTT021 948503 WSZ085 340511 33052M WTT010 WSZ002 33700A 33390G 36549S 35889A WTP013...
- Page 33 LARCH BOARD PARTS 43501A WSZ002 466001 43500A 466003 466002...
- Page 34 SUCTION GUIDE PARTS 50FZZA 54974T WSZ002 56549F 56201A 54974S WTT037 55900A 56851D WSZ002 50CZZH 54810C WTT028...
- Page 35 INTERIOR PARTS WSZ002 54811A 56411A 568771 W067 6016 6014 56501A 56930V 6015 6017 6010 6012 6011 6013 WSZ002 35012A 56912B WSZ002 WSZ002 56324A 55262A...
- Page 36 BASE PLATE PARTS 56170D 63302L WTT028 63302R 13806F WSZ002 647781 WTT021 WTT030 647781...
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Page 37: Schematic Diagram Of P.c.b
SCHEMATIC DIAGRAM OF P.C.B. -
Page 38: Printed Circuit Board
PRINTED CIRCUIT BOARD... - Page 39 March, 1999 P/NO. 3828W5S1100 Printed in Korea...