LG SolarDOM MP-9485S Service Manual
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LG SolarDOM MP-9485S Service Manual

Light oven “solardom”
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Website: http://biz.lgservice.com
LIGHT OVEN "SolarDOM"
SERVICE MANUAL
MODEL: MP-9485S
MP-9485SA
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
February, 2006
P/NO : 382885S5384
Printed in Korea

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  • Page 1 Website: http://biz.lgservice.com LIGHT OVEN “SolarDOM” SERVICE MANUAL MODEL: MP-9485S MP-9485SA CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. February, 2006 P/NO : 382885S5384 Printed in Korea...

  • 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 MP-9485S / MP-9485SA MODEL Power Requirement 240 Volts AC 50 Hz Single phase, 3 wire grounded Microwave 1600W Grill Max 1750W Combination Max 2150W Convection 2150W Power Output 900 Watts full microwave power (IEC 60705) Microwave Frequency...

  • 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 EARTHING INSTRUCTIONS 1. Empty the oven and clean inside it with a soft, This oven is designed to be used in a fully earthed damp cloth. Check for damage such as misaligned condition.

  • Page 7: Operating Instructions

    OPERATING INSTRUCTIONS FEATURES Oven Front Plate Control Panel Deco. Window Door Screen Control Panel Door Frame Choke Cover Safety Door Lock System HIGH Rack LOW Rack Metal Tray CONTROL PANEL 1. Clock: You can set the time of day. 8. Enter: You can determine the selected cooking category, 2.

  • Page 8: Operating Sequence

    OPERATING SEQUENCE 6. SPEED COMBI COOKING The following is a description of component functions during oven operation. *Speed combi Categories Co-1 Grill-1 + Microwave Power 1. SETTING THE CLOCK Co-2 Grill-2 + Microwave Power Co-3 Grill-3 + Microwave Power Turn Dial Stop/Clear Clock Desired...

  • Page 9: Schematic Diagram

    SCHEMATIC DIAGRAM...

  • Page 10: Circuit Description

    CIRCUIT DESCRIPTION power of oven as POWER LEVEL. (refer to page 1-1) GENERAL DETAILS • One complete cycle of relay 4 is 32 seconds. • The low voltage transformer supplies the necessary voltage to the micom controller when power cord is WHEN THE DOOR IS OPENED DURING 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: Record Keeping And Notification After Measurement

    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 oven supplied at its rated voltage and operated from the following formula : at its maximum microwave power setting with a load 4187 X (∆T) + 0.55 X (T ) X M of (1000 ±...
  • Page 14 D. PCB ASSEMBLY REMOVAL 1) Remove the control panel assembly from the Please use the JIG cavity. (Refer to control panel assembly removal (P/No. 383EW5A224A) on previous page.) below for door removal. 2) Remove screws which hold the PCB sub assembly to the PCB holder.
  • Page 15 H. FAN MOTOR ASSEMBLY REMOVAL J. REMOVING THE TURNTABLE MOTOR 1) Remove the metal tray. 1) Remove controller assembly, bracket assembly, 2) Remove the turntable shaft VERY CAREFULLY. power cord, latch board-R from upper. 3) Lay the unit down on its back. 2) Disconnect the leadwire from fan motor, latch board-R 4) Remove the turntable motor cover.
  • Page 16 K. C-MOTOR, THERMISTOR L. INTERLOCK SYSTEM REMOVAL 1) INTERLOCK MECHANISM The door lock mechanism is a device which has 1) Remove controller assembly. been specially designed to eliminate completely 2) Disconnect the leadwire from the circulation motor microwave activity when the door is opened during terminal and oven thermostat.
  • Page 17 M. UPPER SHEATH HEATER REMOVAL O. LOWER HEATER REMOVAL 1) Remove two hex nuts holding the sheath heater. 1) Disconnect the leadwire from the sheath heater. 2) Remove the base plate from cavity. 2) Remove the sheath heater from the oven cavity. 3) Remove the nuts from the oven cavity of the side.

  • 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 FOR PRIMARY SWITCH TYPE NO. SZM-V 16-FA-62 FOR MONITOR SWITCH TYPE NO. SZM-V 16-FA-63 FOR SECONDARY SWITCH B. SECONDARY INTERLOCK SWITCH TEST A.

  • 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: Test Procedure

    COMPONENTS TEST PROCEDURE RESULTS Antenna Chassis Gasket 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 then...
  • Page 21 COMPONENTS TEST PROCEDURE RESULTS FUSE Check for continuity of the fuse with an Normal Abnormal H.V. FUSE multi-meter. NOTE: If the fuse is blown, check the primary, the secondary, and the monitor switches, H.V.D. and H.V.C. before replacing the fuse. If the fuse is blown by improper switch operation replace the defective switch and the fuse at the same time.
  • Page 22 COMPONENTS TEST PROCEDURE RESULTS Cooking Start Disconnect the 4 pin Check for P.C.B.connector. connector from P.C.B. (Refer to schematic diagram) Cooking Start RELAY OF P.C.B. (Wire leads removed.) Note: Relay Relay 1: Fan motor Circulation motor Relay 2: Oven lamp Turntable motor Rotisserie motor Relay 3: P.T.C Relay...
  • Page 23 COMPONENTS TEST PROCEDURE RESULTS CIRCULATION MOTOR Measure the resistance. Normal : Approx. 170 ohm. (Wire leads removed) (Multi-meter scale: R x 1) Abnormal : Infinite or several ohm. KEY PCB Check continuity between switch Key P.C.B. Main P.C.B terminals, by pressing an appropriate pad on key board.

  • Page 24: 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 OVEN. THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL. CAUTIONS 1. Check grounding before checking for trouble. 2.
  • Page 25 (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 26 (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 primary Check continuity 1. Fuse blows. Continuity. monitor switch. and monitor of monitor switches.
  • Page 27 (TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired program times are set and START button is touched. CONDITION CHECK RESULT CAUSE REMEDY Defective Replace 1.Setting time does Check continuity No continuity. secondary switch secondary switch not count down of secondary...
  • Page 28 (TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run. (Display operates properly) CONDITION CHECK RESULT CAUSE REMEDY No microwave Defective P.C.B Replace P.C.B Disconnect the No continuity. oscillation. assembly. assembly. wire leads from relay 4 and check continuity Continuity.
  • Page 29 (TROUBLE 6) Oven does not cook properly when programmed for the set power level (Operates properly on HIGH) CONDITION CHECK RESULT CAUSE REMEDY Defective P.C.B Replace P.C.B Output is full when Disconnect the Abnormal. assembly. assembly. you set lower wire leads from power level.

  • Page 30: Exploded View

    #EV# EXPLODED VIEW INTRODUCTION INTERIOR PARTS CONTROL PANEL PARTS OVEN CAVITY PARTS BASE PLATE PARTS LATCH BOARD PARTS DOOR PARTS -6-1-...

  • Page 31: Door Parts

    #EV# DOOR PARTS 13581A 13552A 13213E WPZ016 WTP002 140262 14970A 140261 WPZ016 14970A WTT051 14891A 14980A 13650A -6-2-...
  • Page 32 #EV# CONTROL PANEL PARTS WTT028 268711 24781S 24810L WTT028 24810R WTP004 24980A 268712 WTP004 250201 249401 23551A 250201 -6-3-...
  • Page 33 #EV# OVEN CAVITY PARTS (Color Change : Gray Black) 35026C (Color Change : Gray Black) 35026G WTT021 WTT029 WTT022 33390M 33112U WTT029 WNZ015 WTT022 33052M 348101 34370T 343501 WNZ015 368771 353001 36549S WTP013 63302A 54790A WTT028 647781 WTT028 63303A 647781 WTT028 -6-4-...
  • Page 34 #EV# LATCH BOARD PARTS WSZ085 WSZ085 43501L 43501R 466001 43500R 466001 43500L 466003 44510A -6-5-...
  • Page 35 #EV# INTERIOR PARTS (I) WTT028 55264A 353002 53550L 56324A 56912B 948502 WSZ002 WTT021 34890C WSZ085 WTT028 350122 33034A 348102 WTT021 552652 35300H WTT021 WSZ085 552651 -6-6-...
  • Page 36 #EV# INTERIOR PARTS (II) WTP002 WSZ002 56930V WSZ002 56901A T021 948501 54810A 34930W WSZ002 WTP002 56170D WTT028 WTT021 56201A 54980A WSZ002 WTT028 56549F WNH002 50FZZA 56930M 56411A WSZ002 350121 50CZZH 56322A 54810C 33660A 36549W WMP021 56851D 55900A WWS005 WWP008 WSZ085 WNH003 568771 -6-7-...
  • Page 37 -41-...

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