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Goldstar MV-1525W Service Manual

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See also: Service Manual , Owner's Manual & Cooking Guide

MICROWAVE OVEN

SERVICE MANUAL
MODEL: MV-1525W,
MV-1525B
CAUTION
BEFORE SERVICING THE UNIT, READ THE
SAFETY PRECAUTIONS IN THIS MANUAL.
http://www.LGEservice.com

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Summary of Contents for Goldstar GoldStar MV-1525W

  • Page 1: Microwave Oven

    http://www.LGEservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: MV-1525W, MV-1525B CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • 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 1,500W maximum (Microwave oven only) 1,600W maximum (Microwave oven+Cook top lamps+Ventilation fan) Microwave Output 1000W (IEC 705 TEST PROCEDURE) Adjustable 100W through 1000W, 10 steps Frequency 2,450 MHz 50 MHz Power Supply 120 VAC, 60 Hz Rated Current 13 Amp.

  • 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 AUTO TOUCH BEVERAGE POTATO POPCORN CASSEROLE FRESH FROZEN PIZZA BACON VEGETABLE VEGETABLE DINNER SOUP FROZEN RICE PLATE SAUCE ENTREE MORE MORE Ez On Ez On DEFROST LESS LESS HOLD POWER WARM STOP START HELP CLEAR CUSTOM CUSTOM CLOCK LIGHT TIMER...

  • Page 8: Control Panel Instructions

    CONTROL PANEL INSTRUCTIONS The entire operation is done by simple touch control (11) LIGHT TIMER pads. Used to set the cooktop light to turn on and off (1) Display Window automatically at any time you want. The light Numbers and letters are shown in the display comes on at the same time every day until reset.

  • Page 9: Overall Circuit Diagram

    OVERALL CIRCUIT DIAGRAM SCHEMATIC DIAGRAM * NOTE SINGLE PHASE AC 120V 1. DOOR OPENED & COOK OFF MODE. ONLY 60Hz 2. BLUE MARK ON LAMP SOCKET MUST BE CONNECTED TO LIVE PART(BLACK WIRE). 3. ONLY CERTAIN MODELS USE THE ABSOLUTE HUMIDITY SENSOR. FUSE 20A MICRO COMPUTER BOARD VENT...

  • Page 10: Matrix Circuit For Touch Key Board

    MATRIX CIRCUIT FOR TOUCH KEY BOARD FROZEN FAN(VENT) POPCORN HELP VEGETABLE HI/LO/OFF FROZEN LIGHT CUSTOM DEFROST POTATO ENTREE HI/LO/OFF KITCHEN DINNER EZ on CLOCK BEVERAGE PLATE TIMER FRESH LIGHT POWER CASSEROLE VEGETABLE TIMER STOP/ HOLD PIZZA RICE START CLEAR WARM SOUP/ TURNTABLE BACON...

  • Page 11: General Information For Service

    GENERAL INFORMATION FOR SERVICE (1) Primary interlock switch GENERAL PRECAUTIONS IN USE (2) Secondary interlock switch A. Never operate the unit when it is empty. (3) Interlock monitor switch Operating the oven with no load may shorten the (4) Choke system life of the 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: (4) Remove 3 screws securing the circuit board. 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) (6) Remove the power cord cover from outcase by (1) Remove the vent grille by removing two screws removing a screw. securing it to the out case. (7) Remove the power cord to the inner of the out (2) Remove two screws securing it to the front case with turning power cord and remove the out bracket.
  • 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 14) dome does not hit any adjacent parts, or it may be (1) Remove the vent grille by removing two screws. damaged. (Figure 11) (2) Remove the controller by removing a screw and •...
  • Page 20 E. REMOVING STIRRER FAN DISK F. REMOVING DOOR (Figure 17) (Figures 15 and 16) (1) Remove the vent grille by removing two screws (1) Remove 1 rivet ASS'Y securing it to the oven securing it to the front bracket. upper plate by using knife blade. (2) Lift up and push the door.
  • Page 21 H. ASSEMBLING DOOR (3) Carefully pull the ventilation motor ASS'Y out of (1) When mounting the door assembly to the oven the microwave oven. (See Figure 20-b) 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 K. REMOVING THE STIRRER FAN MOTOR (1) Remove the turntable. (1) Remove all screws from out case and remove (2) Remove the turntable shaft VERY CAREFULLY the out case. with a slotted screwdriver. (Figure 21) (2) Remove 5 screws securing the air duct to the (3) Remove the base plate by removing 6 screws oven cavity, and remove 2 screws securing the...

  • Page 23: 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. CHECK THE DOOR LATCH AND SWITCH ADJUSTMENT PROCEDURES CLOSING.
  • Page 24 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 25: 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 26: 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 27 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 28-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. 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 on the plastic fastener.

  • Page 29: 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 Relay 2 8 sec 14 sec 10 sec 12 sec RELAY2 12 sec...
  • Page 30 (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 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.
  • Page 32 7-21...
  • Page 33 7-22...
  • Page 34 7-23...
  • Page 35 7-24...
  • Page 36 7-25...

  • Page 37: Exploded View

    EXPLODED VIEW DOOR PARTS 1000 1008 1002 1001 W101 1003 1006 1005 1004 1007...

  • Page 38: Controller Parts

    CONTROLLER PARTS 2000 2005 2003 2002 2010 2007 2004...

  • Page 39: Oven Cavity Parts

    OVEN CAVITY PARTS 3016 W106 W106 W106 W101 3006 3031 3003 3031 3001 3000 3007 3017 3002 3018 3019 3020 3011 3008 3014 3013 3010 3030 3015 3009 3030...

  • Page 40: Latch Board Parts

    LATCH BOARD PARTS 4000 4001 W030 4002 4001 4003...
  • Page 41 INTERIOR PARTS (I) 5018 5019 5000 W067 5017 5016 W049 5001 5012 5004 W074 5006 5005 5013 W101 W081 W101 5014 5009 5010 5002 5003 5015 W101 W067 5008 5020 W067...
  • Page 42 INTERIOR PARTS (II) 5111 5110 5117 W110 5108 5100 W106 5109 5115 5101 5106 5104 W106 5102 5105 5112 W067 5113 5114...
  • Page 43 INSTALLATION PARTS 6008 6002 6001...

  • Page 44: Schematic Diagram Of Pcb

    SCHEMATIC DIAGRAM OF P.C.B 8-15...

  • Page 45: Printed Circuit Board

    PRINTED CIRCUIT BOARD 8-16...
  • Page 46 June, 1998 P/NO : 3828W5S0813 Printed in Korea...

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Mv-1525b

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