LG MS-199H Service Manual
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LG MS-199H Service Manual

LG MS-199H Service Manual

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MICROWAVE OVEN
SERVICE MANUAL
MODEL: MS-198H/MS-199H
CAUTION
BEFORE SERVICING THE UNIT, READ THE
SAFETY PRECAUTIONS IN THIS MANUAL.

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Summary of Contents for LG MS-199H

  • Page 1 MICROWAVE OVEN SERVICE MANUAL MODEL: MS-198H/MS-199H CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Tools And Measuring Instruments

    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 3: Measurement With Outer Case Removed

    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 4: 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 5: Fan Motor Assembly Removal

    D. DOOR GROSS ASSEMBLY REMOVAL E. HIGH VOLTAGE TRANSFORMER 1) Open the door. REMOVAL 2) Remove the choke cover cap very carefully with a 1) Discharge the high voltage capacitor. flat-blade screwdriver. 2) Disconnect the leadwire from magnetron, high voltage CAUTION : Be careful not to damage door seal plate transformer, and capacitor.

  • Page 6: Magnetron Removal

    H. AIR DUCT ASSEMBLY REMOVAL L. REMOVING THE TURNTABLE MOTOR 1) Remove the turntable. 1) Disconnect the leadwire from the lamp. 2) Remove the turntable shaft VERY CAREFULLY. 2) Remove the mounting screw to the latch board. 3) Lay the unit down on its back. 4) Remove the turntable motor cover.

  • Page 7: Pcb Assembly Removal

    Make sure the primary, monitor, and secondary switches operate properly by following the continuity test procedure. Dial CAUTION: CHECK THE CORRECT POSITION FIG. 1 MAGNETRON H.V. TRANSFORMER Button Spring H.V. Door Open Button DIODE Release Lever H.V. CAPACITOR MS-199H PRIMARY CIRCUIT PROTECTOR...

  • Page 8: 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 9: 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 10: High Voltage Capacitor

    COMPONENTS TEST PROCEDURE RESULTS Antenna Gasket Chassis Filament Terminals 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)
  • Page 11 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.) 6 sec 16 sec 10 sec 12 sec Relay 1 14 sec 8 sec Relay 2 18 sec 4 sec...

  • Page 12: Troubleshooting

    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 13 (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 14 (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 switches, and switch (with...
  • Page 15 (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 16 (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 17 (TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run. (Display operates properly) CONDITION CHECK RESULT CAUSE REMEDY Defective PCB Replace PCB Output is full power Disconnect the Abnormal. assembly. assembly. when you set lower wire leads from power level.

  • Page 18: Exploded View

    EXPLODED VIEW INTRODUCTION OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS DOOR PARTS LATCH BOARD PARTS CONTROL PANEL PARTS...

  • Page 19: Door Parts

    DOOR PARTS 13581A 13552A 13536A 13213A 13352A 13720D 14026A 14970A...

  • Page 20: Control Panel Parts

    CONTROL PANEL PARTS FOR MS-198H 24781M 268711 WTT028 23572A WTP004 WTP018 26638A 24510L 24970A 250201...
  • Page 21 CONTROL PANEL PARTS FOR MS-199H 24781M 268711 WTT028 23572A WTP018 WTP004 26638A 249401 24510L 24970A 250201...

  • Page 22: Oven Cavity Parts

    OVEN CAVITY PARTS WTT021 33112U 33052M 340511 33390G 34960A 35889A 36549S WTP013...

  • Page 23: Latch Board Parts

    LATCH BOARD PARTS 56912B 55262A 435001 466001 466003 WTT028 466001 WSZ085...

  • Page 24: Interior Parts

    INTERIOR PARTS WSZ002 568771 56411A 56930V 50FZZA WTT028 56201A 56549F 54974S 55900A WTT037 56324A WSZ002 56201B...

  • Page 25: Base Plate Parts

    BASE PLATE PARTS 56901A 56170D WSZ002 63302A 54810C 50CZZH 63303A 56851D WTT021 65006B WSZ002 65006B...

  • Page 26: Schematic Diagram Of P.c.b

    SCHEMATIC DIAGRAM OF P.C.B...

  • Page 27: Printed Circuit Board

    PRINTED CIRCUIT BOARD...

This manual is also suitable for:

Ms-198h

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