Goldstar MVH1670ST Service Manual

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Owner's manual & cooking manual (30 pages)

Owner's manual & cooking manual (30 pages)

Owner's manual & cooking manual (30 pages)

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삼

흥

정

판

MICROWAVE OVEN

SERVICE MANUAL

MODEL : MVH1670ST

CAUTION

BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

P/NO : MFL05746502

Internal Use Only

website: http://us.lgservice.com

August, 2007

Printed in Korea

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Summary of Contents for Goldstar MVH1670ST

Page 1 삼 흥 정 판 Internal Use Only website: http://us.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL : MVH1670ST CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. August, 2007 Printed in Korea P/NO : MFL05746502...
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 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1500W maximum (Microwave oven+Cook top lamps+Ventilation fan) Microwave Output - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1000W (IEC60705) Frequency - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2450 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. LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 8: Control Panel Instructions
CONTROL PANEL INSTRUCTIONS NOTE: Styling and features vary by model. 1. DISPLAY: The Display includes a clock and 14. MELT: Touch this pad to melt butter or margarine, indicators to tell you time of day, cooking time chocolate, cheese, marsh mallow. settings and cooking functions selected.
Page 10: Matrix Circuit For Touch Key Board
MATRIX CIRCUIT FOR TOUCH KEY BOARD STOP/ AUTO KITCHEN START CLOCK EZ-ON SOFTEN DEFROST CLEAR TIMER MELT REHEAT MORE WATER BABY POPCORN COOK SOUP LESS FOOD MEAL QUICK HOLD TIME POWER VENT Light DEFROST WARM COOK LEVEL Hi/Low/Off Hi/Low/Off ON/OFF Copyright ©...
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 J. 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 PRECEDURES AND TROUBLESHOOTING 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 LEAD WIRES FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER. 2.
Page 27: Test Procedures
COMPONENTS TEST PROCEDURES RESULTS 1. Remove wire leads. CAPACITOR 2. Measure resistance. (ohm meter scale: Rx1000) • Terminal to terminal Normal: Momentarily infinite and then soon reach 10 Mega. ohms • Terminal to case Normal: Infinite. 1. Measure continuity. Forward. Normal:Continuity.
Page 28 COMPONENTS TEST PROCEDURES RESULTS 1. Remove wire leads. Normal: TURNTABLE MOTOR 2. Measure resistance. Approximately (ohm meter scale: Rx1000) 2.5 to 3.5 K ohm Abnormal: Infinite or several 1. Unplug microwave oven or disconnect power. Normal: NOISE FILTER 2. Remove wire. N(1)-N(2)(coil): Less than 1 ohm 2.
Page 29: Checkout Procedures
B. CHECKOUT PROCEDURES (1) CHECKOUT PROCEDURES FOR FUSE BLOWING CAUTION: REPLACE BLOWN FUSE WITH 20 AMPERE FUSE. PROBLEMS CAUSES Fuse blows immediately after the door is closed. Improper operation of the primary interlock, secondary Fuse blows immediately after interlock switches and/or the interlock monitor switch. the door is opened.
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.
Page 36: Exploded View
#EV# EXPLODED VIEW DOOR PARTS MODEL : MVH1670ST 13581A 13552A 13536A 13213A 13551A WTT021 14026A 14970A 13650A Copyright © 2007 LG Electronics. Inc. All right reserved. -8-1- LGE Internal Use Only Only for training and service purposes...
Page 37 #EV# CONTROLLER PARTS 268711 24810P WTP018 *07-1 *07-2 23551A 24781M LGE Internal Use Only -8-2- Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 38 #EV# OVEN CAVITY PARTS 34960A WTT027 WTT028 33530A 34810Q 33112U 34930R 35026G 33052A 63303A 56804A 63302A 33550L 36912C 34890C WTT010 35230A 34810T WTT010 Copyright © 2007 LG Electronics. Inc. All right reserved. -8-3- LGE Internal Use Only Only for training and service purposes...
Page 39 #EV# LATCH BOARD PARTS 43500A 466001 WSZ085 43501A 466003 466001 44510A LGE Internal Use Only -8-4- Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 40 #EV# INTERIOR PARTS (I) 33390G WSZ002 34370T 56324A WTT021 35889A 56170D 53300B 33741A 36549S WSZ002 WTP013 WTT021 56851D WSZ002 54810C 53301A 50CZZH Copyright © 2007 LG Electronics. Inc. All right reserved. -8-5- LGE Internal Use Only Only for training and service purposes...
Page 41 #EV# INTERIOR PARTS (II) 36549V 56912B 55231C 53550L WTT021 56804A WTT028 56411A 53740A 55262A FZZA 56930V 56201A WSZ002 568771 55892A 55893A 54930F 53550F 340511 LGE Internal Use Only -8-6- Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 42 #EV# INSTALLATION PARTS 63300M 65862D 65862B 63861A VINYL COOKING COOKING *05-1 *05-2 *06-1 *06-2 UPPER WALL INSTALLATION & GUIDE GUIDE TEMPLATE TEMPLATE MANUAL CARE LABEL LABEL Copyright © 2007 LG Electronics. Inc. All right reserved. -8-7- LGE Internal Use Only Only for training and service purposes...

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