Goldstar MV-1304W Service Manual
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Goldstar MV-1304W Service Manual

Goldstar MV-1304W Service Manual

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MICROWAVE OVEN

SERVICE MANUAL
MODEL: MV-1304W/B
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
May, 2000
P/NO : 3828W5S1599
Printed in Korea

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Summary of Contents for Goldstar MV-1304W

  • Page 1: Microwave Oven

    Website http://biz.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: MV-1304W/B CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. May, 2000 P/NO : 3828W5S1599 Printed in Korea...

  • 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 ............................

  • Page 4: Specifications

    SPECIFICATIONS Rated Power Consumption ........1,350W maximum (Microwave oven+Cook top lamps+Ventilation fan) Microwave Output ...........950W (IEC 705 TEST PROCEDURE) Frequency ...............2,450 MHz ± 50 MHz Power Supply ............120 VAC, 60 Hz Rated Current............12.5 Amp. (Microwave oven+Cook top lamps+Ventilation fan) Magnetron Cooling ..........Forced Air Cooling Rectification.............Rectification Voltage Doubler Half-Wave Door Sealing............Choke System Safety Devices ............Magnetron Thermostat:...

  • 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 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 More Less Clock Timer One Touch Control Popcorn Potato Beverage Auto Frozen Fresh Defrost Entree Vegetable Power Time Stop/ Ez On Start Clear Custom Vent Light On/Off On/Off...

  • Page 8: Control Panel Instructions

    CONTROL PANEL INSTRUCTIONS 1. DISPLAY: The display includes a clock and 11. FRESH VEGETABLE: Touch this pad to cook indicators to tell you time of day, cooking time from 1 to 4 cups. settings, and cooking functions selected. 12. NUMBER: Touch number pads to enter cooking 2.

  • Page 9: Overall Circuit Diagram

    OVERALL CIRCUIT DIAGRAM SCHEMATIC DIAGRAM...

  • Page 10: Matrix Circuit For Touch Key Board

    MATRIX CIRCUIT FOR TOUCH KEY BOARD CUSTOM TIMER Ez On FRESH VEGETABLE...

  • Page 11: General Information For Service

    GENERAL INFORMATION FOR SERVICE FEATURES AND SPECIFICATIONS GENERAL PRECAUTIONS IN USE FEATURES A. Never operate the unit when it is empty. Operating the oven with no load may shorten the life of the A. The safety systems incorporated in this model are: magnetron.

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

  • 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) When you replace the magnetron, measure for 1 inch/sec (2.5cm/sec) along the shaded area, microwave energy leakage before the outer case otherwise a false reading may result.

  • Page 15: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS IMPORTANT NOTES: UNIT MUST BE DISCONNECTED FROM ELEC- TRICAL OUTLET WHEN MAKING REPAIRS, 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 INSERT THE F.P.C. CONNECTOR HOW TO REMOVE THE F.P.C. CONNECTOR Follow the steps below as illustrated in Figures 6 Follow the steps below as illustrated in Figures 4 and 7 to insert the F.P.C. connector. and 5 to remove the F.P.C. connector. (1) Insert the F.P.C.
  • Page 17 B. REMOVING THE OUT CASE(Figure 8) (1) Remove the vent grille by removing two screws (5) Remove four screws securing them to the back securing it to the front of out case. plate. (2) Remove four screws securing it to the air duct. (6) Slap the both side of out case backward by 1~2 (On the top plate of out case) inches.
  • 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 7-11, 12. Secondary Interlock Switch Latch Board...
  • Page 19 D. REMOVING MAGNETRON NOTES: • When removing the magnetron, make sure that its (Figures 11 Through 12) dome does not hit any adjacent parts, or it may be (1) Disconnect the power supply cord from the wall damaged. outlet. (2) Remove the vent grille and the out case from unit. •...
  • Page 20 E. REMOVING DOOR (Figure 13) G. ASSEMBLING DOOR (1) Remove the vent grille by removing two screws (1) When mounting the door assembly to the oven securing it to the front of the out case. assembly, be sure to adjust the door assembly parallel (2) Remove the door cap with small screw driver.
  • Page 21 I. REMOVING THE TURNTABLE MOTOR (1) Remove the turntable. (2) Remove the rotating ring on the bottom plate of oven cavity. (3) Remove the base plate by removing 5 screws securing it to the oven cavity. (Figure 17) (4) Disconnect the leadwire from the turntable motor terminals.

  • Page 22: 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. ADJUSTMENT PROCEDURES CHECK THE DOOR LATCH AND SWITCH To avoid possible exposure to microwave energy CLOSING.
  • Page 23 TEST THE LATCH AND SWITCH SEQUENCE (5) Open the oven door slowly. Watch the door latch, (7) When you achieve the proper sequence of the Secondary Switch. Release Rod and Lever switches in Steps 5 and 6, tighten the latch board on the switches to make sure they are zero to the screws at that point.

  • Page 24: Interlock Continuity Test

    INTERLOCK CONTINUITY TEST A. PRIMARY INTERLOCK SWITCH TEST B. SECONDARY INTERLOCK SWITCH TEST Disconnect the wire lead from the secondary When the door is opened slowly, an audible click switch. should be heard at the same time or successively Connect the ohmmeter leads to the common at intervals and the latches should activate the (COM) and normally open (NO) terminals of the switches with an audible click.

  • Page 25: Test And Checkout Procedures And Trouble Shooting

    TEST AND CHECKOUT PROCEDURES, AND TROUBLE SHOOTING - CAUTIONS - - DISCONNECT THE POWER SUPPLY CORD FROM THE WALL OUTLET WHENEVER Filament REMOVINGING THE CABINET FROM THE UNIT. Winding PROCEED WITH THE TESTS ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR Secondary AND REMOVING THE WIRE LEADS FROM THE Winding...
  • Page 26 COMPONENTS TEST PROCEDURES RESULTS Measure the resistance: Normal reading: (1) Terminal to terminal 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 22 CAPACITOR (2) Terminal to case Normal readings: Infinite.
  • Page 27 COMPONENTS TEST PROCEDURES RESULTS CIRCUIT BOARD See page 7-19 for “CHECKOUT PROCEDURES FOR THE CIRCUIT BOARD” Measure the resistance between terminal When When not pins of connector KEY CON. Resistance touched touched NOTE: value Less than More than When reconnecting the FPC connector, 400 ohms 1 mega ohm make sure that the holes on the FPC connector are properly engaged with hooks...

  • Page 28: Checkout Procedures

    COMPONENTS TEST PROCEDURES RESULTS POWER Check for continuity of relay 2 with an LEVEL ohm-meter. (Remove wire leads from relay 2 and 4 sec 18 sec operate the unit.) 6 sec 16 sec 8 sec 14 sec Relay 2 10 sec 12 sec RELAY2 12 sec...
  • Page 29 (2) CHECKOUT PROCEDURES FOR RELAY. - PROBLEM (A) - 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 circuit board - PROBLEM (B) -...
  • Page 30 (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.
  • Page 31 7-20...
  • Page 32 7-21...
  • Page 33 7-22...
  • Page 34 7-23...
  • Page 35 7-24...

  • Page 36: Exploded View

    #EV# EXPLODED VIEW DOOR PARTS MODEL : MV-1304W/B 13581A 13552A 15006A 13536A 13720D 13720D 13552A 14026A 14970A...

  • Page 37: Controller Parts

    #EV# CONTROLLER PARTS 24781M 24810P 268711 23572A 26638A 24510L 24970A 250201...

  • Page 38: Oven Cavity Parts

    #EV# OVEN CAVITY PARTS 34960A 33530A 33112U 340511 56804A 368771 56912B 33052M 63302A WTT022 53550L 34890C 34810T 95230A...

  • Page 39: Latch Board Parts

    #EV# LATCH BOARD PARTS 43501A 466001 43500A 466003 466001...
  • Page 40 #EV# INTERIOR PARTS (I) 33390G 56324A 34036W 35889A 36549S 56201B 56170D 54974A 53300B 56930G 30RMZZ...
  • Page 41 #EV# INTERIOR PARTS (II) 36549V 56930V 54810C 44360A 56912C WTT033 50CZZH 56549F 55262A 56851D 50FZZA 56201A 56930M 53550L 55900A 56411A 568771...
  • Page 42 #EV# INSTALLATION PARTS 63301M 65862D 65862B 949221...

  • Page 43: Schematic Diagram Of Pcb

    SCHEMATIC DIAGRAM OF P.C.B 8-11...

This manual is also suitable for:

Mv-1304bMv-1304w/b

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