Goldstar MV1604ST Service Manual
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Goldstar MV1604ST Service Manual

Goldstar MV1604ST Service Manual

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MICROWAVE OVEN
SERVICE MANUAL
MODEL : MV1604ST
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : 3828W5S4067
website: http://us.lgservice.com
May, 2004
Printed in Korea

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  • Page 1 MICROWAVE OVEN SERVICE MANUAL MODEL : MV1604ST CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. May, 2004 Printed in Korea P/NO : 3828W5S4067...

  • Page 2: Safety Precautions

    CAUTION SAFETY PRECAUTIONS PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY a. Do not operate or allow the oven to be operated with the door open. b. Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs as necessary;...

  • Page 3: Table Of Contents

    FOREWORD Read this Manual carefully. Failure to adhere to or observe the information in this Manual may result in exposing yourself to the Microwave Energy normally contained within the oven cavity. TABLE OF CONTENTS (Page) SAFETY PRECAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Inside front page SPECIFICATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1 CAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-1 INSTALLATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-1...

  • Page 4: Specifications

    SPECIFICATIONS Rated Power Consumption - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1,500W maximum (Microwave oven+Cook top lamps+Ventilation fan) Frequency - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2,450 MHz ±...

  • 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. PRECAUTIONS ON INSTALLATION A. Plug the power supply cord into a 120V AC, 60Hz, single-phase power source with a capacity of 15A or 20A. B. Avoid placing the unit in a location where there is direct heat or splashing water.

  • Page 7: Operating Instructions

    OPERATING INSTRUCTIONS CONTROL PANEL NOTE: Styling and features vary by model.

  • Page 8: Control Panel Instructions

    CONTROL PANEL INSTRUCTIONS NOTE: Styling and features vary by model. 13. NUMBER: Touch number pads to enter cooking time, 1. DISPLAY: The Display includes a clock and indicators to power level, quantities or weights. tell you time of day, cooking time settings and cooking functions selected.

  • Page 9: Overall Circuit Diagram

    OVERALL CIRCUIT DIAGRAM SCHEMATIC DIAGRAM...

  • Page 10: Matrix Circuit For Touch Key Board

    MATRIX CIRCUIT FOR TOUCH KEY BOARD TIME CUSTOM LIGHT TURNTABLE EZ-ON ON/OFF COOK COOK TIMER LIGHT VEGETABLE POTATO PIZZA HI/LOW/OFF HI/LOW/OFF AUTO POPCORN COOK REHEAT DEFROST CUSTOM HOLD KITCHEN MORE LESS CLOCK WARM TIMER POWER STOP/ START LEVEL CLEAR...

  • Page 11: General Information For Service

    GENERAL INFORMATION FOR SERVICE GENERAL PRECAUTIONS IN USE FEATURES AND SPECIFICATIONS FEATURES A. Never operate the unit when it is empty. Operating the oven with no load may shorten the A. The safety systems incorporated in this model are: life of the magnetron. Whenever cooking dry foods (1) Primary interlock switch (dried fish, bread, etc.) or a small amount of food, (2) Secondary interlock switch...

  • Page 12: Service Information

    SERVICE INFORMATION PRECAUTIONS AND REPAIR SERVICE TIPS PRELIMINARY (3) Do not operate the unit until it is completely A. SINCE NEARLY 2,100 VOLTS EXISTS IN SOME repaired, if any of the following conditions exist. CIRCUITS OF THIS UNIT REPAIRS SHOULD BE The unit must not be operated.

  • Page 13: Microwave Leakage Test

    MICROWAVE LEAKAGE TEST CAUTIONS MEASURING MICROWAVE ENERGY LEAKAGE • Be sure to check microwave leakage prior to servicing the oven if the oven is operative prior • Pour 275±15cc of 20±5°C(68±9°F) water in a to servicing. beaker which is graduated to 600 cc, and place •...

  • Page 14: Power Output Measurement

    MEASUREMENT WITH THE OUTER CASE NOTE WHEN MEASURING REMOVED (1) Do not exceed meter full scale deflection. (2) The test probe must be removed no faster than 1 (1) When you replace the magnetron, measure for inch/sec (2.5cm/sec) along the shaded area, microwave energy leakage before the outer case is otherwise a false reading may result.

  • Page 15: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS IMPORTANT NOTES: (4) Remove 3 screws securing the circuit board. UNIT MUST BE DISCONNECTED FROM ELEC-TRICAL OUTLET WHEN MAKING REPAIRS, Circuit Board RE-PLACEMENTS, ADJUSTMENTS AND CONTIN- UITY CHECKS. WAIT AT LEAST ONE MINUTE, UNTIL THE HIGH VOLTAGE CAPACITOR IN THE HIGH VOLTAGE POWER SUPPLY HAS FULLY DISCHARGED.
  • Page 16 HOW TO REMOVE THE F.P.C. CONNECTOR HOW TO INSERT THE F.P.C. CONNECTOR Follow the steps below as illustrated in Figures 4 Follow the steps below as illustrated in Figures 6 and 5 to remove the F.P.C. connector. and 7 to insert the F.P.C. connector. (1) Hold the edges of the plastic fastener with (1) Insert the F.P.C.
  • Page 17 B. REMOVING THE OUT CASE(Figure 8) (1) Remove the vent grille by removing two screws (6) Remove the power cord cover from outcase by securing it to the out case. removing a screw. (2) Remove two screws securing it to the front bracket. (7) Remove the power cord to the inner of the out case (3) Remove two screws securing it to the air duct.
  • Page 18 C. REMOVING THE DOOR INTERLOCK SWITCHES (Figures 9,10) (1) Disconnect the wire leads from the interlock switches. (2) Remove two screws securing the Latch Board. (3) Make necessary replacements and check microwave energy leakage according to “ADJUSTMENT PROCEDURE” on page 7-12. Latch Board Secondary Interlock Switch...
  • Page 19 D. REMOVING MAGNETRON NOTES: • When removing the magnetron, make sure that its (Figures 11 Through 13) dome does not hit any adjacent parts, or it may be (1) Remove vertgrille. damaged. (2) Remove mount, all. • When replacing the magnetron, be sure to install the (3) Remove outcase.
  • Page 20 E. REMOVING STIRRER FAN DISK F. REMOVING DOOR (Figure 15-a) (Figures 14-a and 14-b) (1) Remove the vent grille by removing two screws securing it to the front bracket. (1) Remove 1 rivet ASS’Y securing it to the oven upper (2) Lift up and push the door.
  • Page 21 H. ASSEMBLING DOOR (3) Carefully pull the ventilation motor ASS'Y out of the (1) When mounting the door assembly to the oven microwave oven. (See Figure 18) assembly, be sure to adjust the door assembly parallel to the chassis. Also adjust so the door has no play between the inner door surface and oven frame assembly.
  • Page 22 K. REMOVING THE TURNTABLE MOTOR NOTES: • Remove the leadwire from the turntable motor VERY (1) Remove the turntable. CAREFULLY. (2) Remove the turntable shaft VERY CAREFULLY • Be sure to grasp the connector not the wires when with a slotted screwdriver. (Figure 19) removing.

  • Page 23: Interlock System

    INTERLOCK SYSTEM INTERLOCK SYSTEM INTERLOCK MECHANISM The door lock mechanism is a device which has been specially designed to eliminate completely microwave activity when the door is opened during cooking and thus to prevent the danger resulting from the microwave leakage.
  • Page 24 TEST THE LATCH AND SWITCH SEQUENCE (7) When you achieve the proper sequence of switches in Steps 5 and 6, tighten the latch board (5) Open the oven door slowly. Watch the door latch, screws at that point. the Secondary Switch. Release Rod and Lever on the switches to make sure they are zero to the TEST THE MICROWAVE ENERGY LEAKAGE body of the switches in the following sequence:...

  • Page 25: Interlock Continuity Test

    INTERLOCK CONTINUITY TEST A. PRIMARY INTERLOCK SWITCH TEST B. SECONDARY INTERLOCK SWITCH TEST When the door is opened slowly, an audible click Disconnect the wire lead from the secondary should be heard at the same time or successively switch. at intervals and the latches should activate the Connect the ohmmeter leads to the common switches with an audible click.

  • Page 26: Test And Checkout Procedures And Trouble Shooting

    TEST AND CHECKOUT PROCEDURES, AND TROUBLE SHOOTING - CAUTIONS - Filament - DISCONNECT THE POWER SUPPLY CORD Winding FROM THE WALL OUTLET WHENEVER REMOVINGING THE CABINET FROM THE UNIT. PROCEED WITH THE TESTS ONLY AFTER Secondary DISCHARGING THE HIGH VOLTAGE Winding CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH...
  • Page 27 COMPONENTS TEST PROCEDURES RESULTS Measure the resistance: (1) Terminal to terminal Normal reading: Momentarily indicates several ohms, and then gradually returns to infinite ohms. Abnormal reading: Ohm- Indicates continuity or infinite ohms meter from the beginning. HIGH-VOLTAGE Figure 24-a CAPACITOR (2) Terminal to case Normal readings: Infinite.
  • Page 28 COMPONENTS TEST PROCEDURES RESULTS Measure the resistance between terminal When When not pins of connector KEY CONNECTOR. touched touched Resistance NOTE: value When reconnecting the FPC connector, Less than More than make sure that the holes on the FPC 400 ohms 1 mega ohm connector are properly engaged with hooks on the plastic fastener.

  • Page 29: Checkout Procedures

    COMPONENTS TEST PROCEDURES RESULTS POWER Check for continuity of relay 7 with an LEVEL ohm-meter. (Remove wire leads from relay 7 and 4 sec 18 sec operate the unit.) 6 sec 16 sec 8 sec 14 sec Relay 2 10 sec 12 sec 12 sec 10 sec...
  • Page 30 (2) CHECKOUT PROCEDURES FOR RELAY. - PROBLEM (A) - Vent fan motor and oven lamp turn on without touching START key when the door is closed. Remove the mate connector of I/O GOOD CON from the circuit board. Does the unit still operate? Replace the Defective circuit board...
  • Page 31 (3) CHECKOUT PROCEDURES FOR CIRCUIT BOARD The following symptoms indicate a defective circuit 6) Wrong figures appear. board. 7) The figures of all digits. 1) The start function fails to operate but the high 8) Some of the indicators do no flicker light up. voltage Systems, the interlock switches, the door 9) The clock does not keep time properly.
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  • Page 35 7-24...

  • Page 36: Exploded View

    EXPLODED VIEW DOOR PARTS 13581A 13552A 13536A 13213A WTT021 13551A 14026A 14970A 13650A...
  • Page 37 CONTROLLER PARTS 268711 24810P WTP018 23551A 24781M...
  • Page 38 OVEN CAVITY PARTS 34960A WTT027 WTT028 33530A 34810Q 33112U 34930R 35026G 33052A 63303A 368771 56804A 63302A 33550L 36912C 34890C WTT022 35230A 34810T WTT022...
  • Page 39 LATCH BOARD PARTS 43500A 466001 WSZ084 43501A 466003 466001 44510A...
  • Page 40 INTERIOR PARTS (I) 33390G WSZ002 34370T 56324A WTT021 35889A 56170D 53300B 33740A 36549S WSZ002 WTP013 WTT021 56851D WSZ002 54810C 53300A 50CZZH...
  • Page 41 INTERIOR PARTS (II) 36549V 56912B 55231C 53550L WTT021 56804A WTT028 56411A 53740A 55262A WTP004 50FZZA 56930V 54974T 55006F 56501A 568771 WSZ002 55892A 54930F 53550F 340511...
  • Page 42 INSTALLATION PARTS 63300M 65862D 65862B 63861A VINYL...

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