LG PRIVILEGE MS-119SE Service Manual
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LG PRIVILEGE MS-119SE Service Manual

LG PRIVILEGE MS-119SE Service Manual

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MICROWAVE OVEN
SERVICE MANUAL
MODEL : MS-119SE
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
website: http://www.lgservice.com
e-mail: http://www.lgeservice.com/techsup.html

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  • Page 1 website: http://www.lgservice.com e-mail: http://www.lgeservice.com/techsup.html MICROWAVE OVEN SERVICE MANUAL MODEL : MS-119SE CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • 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-119SE MODEL 120 Volts AC 60 Hz Power Requirement 1,500 Watts Single phase, 3 wire grounded 1100 Watts full microwave power (IEC60705) Power Output 2,450 MHz Microwave Frequency 2M246 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 Safety Door Lock System Turntable Rotating Ring CONTROL PANEL Defrost 1.Potato 2.Fresh Vegetable 3.Frozen Vegetable 4.Frozen Entree 5.Ground meat SENSOR SENSOR SENSOR REHEAT COOK DEFROST AUTO POPCORN BEVERAGE...

  • Page 8: Operating Sequence

    OPERATING SEQUENCE 7. AUTO COOKING The following is a description of component functions during oven operation. AUTO STOP/CLEAR NUMBER 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: 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.

  • 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) Separate the Case (Sensor-L, Sensor-U). 3) Separate the Bracket (Sensor-U). 4) Remove the screw of the PCB Assy. 5) Separate the Shield Wire. Case, Sensor-L Bracket, Sensor-U PCB Assy, Sensor Bracket, Sensor-L...

  • 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 CONNECTOR Measure the resistance. Port Resistance 1 and 2 Approx.

  • 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. monitor switch. primary, monitor, 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.

  • Page 29: Exploded View

    #EV# EXPLODED VIEW INTRODUCTION OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS DOOR PARTS LATCH BOARD PARTS CONTROL PANEL PARTS...
  • Page 30 #EV# DOOR PARTS 13581A 15006A 13552A 13536A 13213A 14026A 14970A 13352A 13720D...
  • Page 31 #EV# CONTROL PANEL PARTS 24781M 23572A 23550D 268711 26638A WTP018 23550D...
  • Page 32 #EV# OVEN CAVITY PARTS 33112U WTT021 33052A WTT010 33390G 35889A 34036W 36549S WTP013...
  • Page 33 #EV# LARCH BOARD PARTS WSZ085 466001 43500A 466003 466001 44510A...
  • Page 34 #EV# SUCTION GUIDE PARTS 50FZZA WSZ002 56549F 56201A 54974S WTT037 55900A 56851D WSZ002 50CZZH 54810C WTT028...
  • Page 35 #EV# INTERIOR PARTS WSZ002 56411A 568771 56501A 535511 WTP002 568711 56930V 548111 548112 535512 568773 WTT021 34930W 56201B 54980A 56912B WSZ002 WSZ002 56324A 55262A...
  • Page 36 #EV# BASE PLATE PARTS 63303A 56170D 63302A 948503 647781 WTT028 WSZ002 WTT021...

  • Page 37: Schematic Diagram Of P.c.b

    SCHEMATIC DIAGRAM OF P.C.B.

  • Page 38: Printed Circuit Board

    PRINTED CIRCUIT BOARD...
  • Page 39 APR., 2001 P/NO. 3828W5S1792 Printed in Korea...

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