LG KM36SW Service Manual
  1. Manuals
  2. Brands
  3. LG Manuals
  4. Microwave Oven
  5. KM36SW
  6. Service manual
LG KM36SW Service Manual

LG KM36SW Service Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
MICROWAVE OVEN
SERVICE MANUAL
MODEL : KM36SW
NOM
NYCE
711

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the KM36SW and is the answer not in the manual?

Questions and answers

Related Manuals for LG KM36SW

Summary of Contents for LG KM36SW

  • Page 1 MICROWAVE OVEN SERVICE MANUAL MODEL : KM36SW NYCE...

  • 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 KM36SW MODEL 120 Volts AC 60 Hz Power Requirement 1 500 Watts (13 A) Single phase, 3 wire grounded 1 000 Watts full microwave power (IEC705) Power Output 2 450 MHz Microwave Frequency 2M248 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 Front Plate Window Door Screen Door Seal Display Window Control Panel Door Open Button Safety Door Lock System Turntable Rotating Ring CONTROL PANEL 1000 WATT SENSOR SENSOR SENSOR SENSOR COOK REHEAT POPCORN AUTO QUICK EZ ON COOK CUSTOM TIMER...

  • Page 8: Operating Sequence

    OPERATING SEQUENCE 7. AUTO WEIGHT DEFROST COOKING The following is a description of component functions during oven operation. NUMBER OF AUTO STOP/CLEAR START WEIGHT DEFROST 1. SETTING THE CLOCK 8. CHILD LOCK STOP/CLEAR CLOCK NUMBER CLOCK 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

    PRIMARY FUSE H.V. SWITCH TRANSFORMER MICOM CONTROLLER TURN HUMIDITY MONITOR SENSOR TABLE OVEN SWITCH MOTOR MO TOR LAMP H.V. CAPACITOR T.T.M. O.L. F.M. H.V. DIODE AC 120V 60Hz SECONDARY MAGNETRON SWITCH ** NOTE : DOOR IS OPENED. BK : BLACK BL : BLUE YL : YELLOW RD : RED...

  • Page 10: Circuit Description

    CIRCUIT DESCRIPTION GENERAL DETAILS • A high voltage of approximately 2100 volts AC is 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, HI-1501 • Long nose pliers - Narda 8100, 8200 •...
  • 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 F. MAGNETRON REMOVAL G. SUCTION GUIDE MAIN ASSEMBLY 1) Disconnect the leadwire from the magnetron. NOTE: Suction Guide Main ASS’Y consists of Latch 2) Carefully remove the mounting screws holding the Board ASS’Y and Suction Guide ASS’Y. To repair any of magnetron and the waveguide.
  • Page 16 H. LATCH BOARD ASSEMBLY AND J. HIGH VOLTAGE TRANSFORMER REMOVAL SUCTION GUIDE ASSEMBLY 1) Discharge the high voltage capacitor. NOTE: Suction Guide Main ASS’Y consists of Latch Board ASS’Y and Suction Guide ASS’Y. To repair any of 2) Disconnect the leadwire from magnetron, high voltage them, the Suction Guide Main ASS’Y should be removed transformer, and capacitor.
  • Page 17 N. INTERLOCK SYSTEM L. HIGH VOLTAGE CAPACITOR AND when removing. DIODE 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 (refer to page 2-1) microwave activity when the door is opened during 2) Disconnect the leadwire from the high voltage cooking and thus to prevent the danger resulting...

  • 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: 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 23 (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 24 (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 25 (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 26 (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 27: Exploded View

    EXPLODED VIEW INTRODUCTION SENSOR PARTS OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS DOOR PARTS SUCTION GUIDE MAIN PARTS CONTROL PANEL PARTS...
  • Page 28 DOOR PARTS 15006A 13552A 13536A 13213A 14026A 14970A 13720D 13352A 13581A...
  • Page 29 CONTROLLER PARTS 268711 WTT028 23572M 26638A WTP018 23550D 24510L 24970A 250201 24781M...
  • Page 30 OVEN CAVITY PARTS WTT021 33112U 948504 948502 WTT010 340511 948507 33052M 33390G 948505 34036W 35889A WSZ002 36549S 368771 WTP013...
  • Page 31 SUCTION GUIDE PARTS 56930V WTP015 568771 WTT028 50FZZA 56820A 56912B 55900A 43500A 466001 54974S 466003 WTT034 56549F 43501A 466002 WSZ084...
  • Page 32 INTERIOR PARTS WSZ002 56411A WTT021 968101 56324A 948506 WSZ002...
  • Page 33 BASE PLATE PARTS 50CZZH 54810C 56851D 340511 WSZ002 63302L 56170D 63302R 948508 647781 647781 WSZ002 WTT028 WTT021 63303R...
  • Page 34 SENSOR PARTS WTT021 56501A 54974T 948502 WTP002 948503 948501...

  • Page 35: Schematic Diagram Of P.c.b

    SCHEMATIC DIAGRAM OF P.C.B.

  • Page 36: Printed Circuit Board

    PRINTED CIRCUIT BOARD...
  • Page 37 March, 1999 Printed in Korea P/NO. 3828W5S1102...

Table of Contents