Related Manuals for LG MS-114YF
Summary of Contents for LG MS-114YF
- Page 1 Website http://biz.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: MS-114YF/MS-114YB CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. March, 2001 Printed in Korea P/NO : 3828W5S1802...
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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-114YF/MS-114YB MODEL 120 Volts AC 60 Hz Power Requirement 1,550 Watts Single phase, 3 wire grounded 1,150 Watts full microwave power (IEC60705) Power Output 2,450 MHz Microwave Frequency 2M246, 2M248J Magnetron 0 ~ 99 min. 99 sec. -
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 CAVITY DOOR SEAL DISPLAY WINDOW CONTROL PANEL GLASS TURNTABLE SAFETY INTERLOCK ROTATING RING SYSTEM CONTROL PANEL 1. INDICATORS. 2. LOCAL MENU: This menu has been preprogrammed to cook food automatically by one touch. 3. AUTO COOK: This feature provides you with the best cooking method by selecting menu. -
Page 8: Operating Sequence
OPERATING SEQUENCE 7. AUTO WEIGHT DEFROST COOKING The following is a description of component functions during oven operation. DESCONGELADO NUMBER OF PARAR/BORRAR INICIO AUTO. WEIGHT 1. SETTING THE CLOCK 8. CHILD LOCK PARAR/BORRAR RELOJ NUMBER INICIO 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: Schematic Diagram
SCHEMATIC DIAGRAM... -
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 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 F. MAGNETRON REMOVAL G. REMOVING THE TURNTABLE MOTOR 1) Disconnect the leadwire from the magnetron. 1) Remove the turntable and rotating ring. 2) Lay the unit down on its back. 2) Carefully remove the mounting screws holding the 3) Remove the turntable motor cover. magnetron and the waveguide.
- Page 16 H. HIGH VOLTAGE TRANSFORMER K. INTERLOCK SYSTEM REMOVAL 1) INTERLOCK MECHANISM 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
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 18: 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 19 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 20 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 10 sec 12 sec 12 sec 10 sec...
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Page 21: 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 22 (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 23 (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 Replace fuse, Malfunction of the Check continuity 1. Fuse blows. Continuity. monitor switch. primary, monitor, of monitor secondary switch (with...
- Page 24 (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 25 (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.
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Page 26: Exploded View
#EV# EXPLODED VIEW INTRODUCTION MODEL : MS-114YF/MS-114YB OVEN CAVITY PARTS INTERIOR PARTS DOOR PARTS BASE PLATE PARTS LATCH BOARD PARTS CONTROL PANEL PARTS... - Page 27 #EV# DOOR PARTS 13581A 15006A 13552A 13536A 13213A 14890A 13720D 14026A 14970A...
- Page 28 #EV# CONTROLLER PARTS First check the rating label on the back of oven. and order SVC parts accoding to ECN 23572A 268711 26638A WTP028 24510L 24970A 250201 24781M...
- Page 29 #EV# OVEN CAVITY PARTS 33112U WTT021 948502 33052M 340511 WTT010 33390G 36549S 34960A 35889A 948504 WTP013...
- Page 30 #EV# LATCH BOARD PARTS 43501A WSZ085 466001 43500A 466003 466001...
- Page 31 #EV# INTERIOR PARTS WSZ002 568771 WSZ002 50FZZA 56930V 34930W 55006F 56549F WTT028 54974S WSZ002 WSZ002 55900A WTT037 35012A WSZ002 948501 56324A 50CZZH 56912B WSZ002 WSZ002 56851D 55262A 54810C WTT028...
- Page 32 #EV# BASE PLATE PARTS 63303L 56170D 63302L 948503 647781 WTT028 63302R WSZ002 63303R WTT021...
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Page 33: Schematic Diagram Of P.c.b
SCHEMATIC DIAGRAM OF P.C.B. -
Page 34: Printed Circuit Board
PRINTED CIRCUIT BOARD...