Goldstar MV-1525B Service Manual Download Page 33

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7-22

PROBLEM - C:

Display does not start countdown when START key is touched.

PROBLEM - D:

Unit operation seems to be normal but little or

no heating is produced in oven load.

Check: 1. TOUCH KEY BOARD (START KEY FUNCTION)

Check: 1. AIR VENTS

Check continuity of connector

CN2 between Pin 1(PK) and

pin 3(BL) when the door is

closed

Check operation of fan

motor when START key

is touched.

Continuity

Check contact of

connector S1

Contact

Replace

Circuit board

Correct

seating

Normal

circuit board

Normal

contact

Poor

contact

Normal Primary

switch

continuity

Adjust or replace door

sensing switch.

Measure resistance

of H.V.capacitor

(see page 7-16)

Resistance

incorrect

Normal

resistance

Normal

operation

Replace

thermostat

Normal

thermostat

Measure resistance

of fan motor

8 ohms

Resistance

incorrect

Replace

fan motor

Normal

fan motor

Normal

circuit board

Replace

circuit board

Normal

resistance

Replace H.V.C.

Normal H.V.C.

Normal

magnetron

Replace

magnetron

Normal

operation

THERMOSTAT

Jumper across

terminals of

THERMOSTAT by

using jumper lead

Runs

Summary of Contents for MV-1525B

Page 1: ...MICROWAVE OVEN SERVICE MANUAL MODEL MV 1525W CAUTION http www LGEservice com BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MV 1525B ...

Page 2: ...alignment integrity and connections d Any defective or misadjusted components in the interlock monitor door seal and microwave generation and transmission systems shall be repaired replaced or adjusted by procedures described in this manual before the oven is released to the owner e A Microwave leakage check to verify compliance with the Federal Performance Standard should be performed on each ove...

Page 3: ...RAM 5 1 MATRIX CIRCUIT FOR TOUCH KEY BOARD 5 2 GENERAL INFORMATION FOR SERVICE 6 1 GENERAL PRECAUTIONS IN USE 6 1 TRIAL OPERATION 6 1 FEATURES AND SPECIFICATIONS FEATURES 6 1 SERVICE INFORMATION 7 1 PRECAUTIONS AND REPAIR SERVICE TIPS 7 1 MICROWAVE LEAKAGE TEST 7 2 POWER OUTPUT MEASUREMENT 7 3 DISASSEMBLY INSTRUCTIONS 7 4 INTERLOCK SYSTEM 7 12 INTERLOCK CONTINUITY TEST 7 14 TEST AND CHECKOUT PROCE...

Page 4: ...Open at 109 C _ 4 C Oven Cavity Thermostat Open at 110 C _ 50 C Fuse 20A Primary Interlock Switch Secondary Interlock Switch Interlock Monitor Magnetron 2M246 310GF or 2M248E High Voltage Capacitor Capacitor 1 0µF 2 1 KV AC High Voltage Diode Diode 350mA 9 0 KV Cook top Lamp 125 V 30 W or 40 W Cavity Lamp 125 V 30 W or 40 W Timer Digital up to 99 mim 99 sec in each cooking stage Tray Tempered Safe...

Page 5: ... area Proper operation of the microwave oven requires that the magnetron be assembled to the waveguide and cavity Never operate the magnetron unless it is properly installed Be sure that the magnetron gasket is properly installed around the dome of the tube whenever installing the magnetron Unlike other appliances the microwave oven is high voltage and high current equipment Though it is free from...

Page 6: ...d at all times In the event of an electrical short circuit grounding reduces the risk of electrical shock The plug must be plugged into an outlet that is properly installed and grounded BEFORE YOU BEGIN READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY WARNING Improper use of the grounding plug can result in a risk of electric shock Do not under any circumstances cut or remove the third gro...

Page 7: ...I LO OFF KITCHEN TIMER CUSTOM SET CLOCK AM PM LIGHTTIMER AM PM POTATO PIZZA RICE DINNER PLATE SOUP SAUCE FROZEN ENTREE BACON FRESH VEGETABLE FROZEN VEGETABLE POPCORN BEVERAGE CASSEROLE POWER HELP HOLD WARM AUTO TOUCH 1 2 3 4 5 6 7 8 0 9 Ez On Ez On DEFROST MORE MORE LESS LESS STOP CLEAR START ...

Page 8: ...ng times etc Also touch the START key to resume cooking after the cooking is temporarily stopped by opening the door The key will not function unless the door is closed 8 DEFROST Key Used to defrost for frozen foods by weight 9 AUTO TOUCH Used to cook the preprogrammed food automatically 10 HELP Key This HELP key display feature information and helpful hints 11 LIGHT TIMER Used to set the cooktop ...

Page 9: ...ECTED TO LIVE PART BLACK WIRE 3 ONLY CERTAIN MODELS USE THE ABSOLUTE HUMIDITY SENSOR BK BK BK OVEN LAMP COOK TOP LAMPS O L BK SINGLE PHASE ONLY AC 120V 60Hz BL BL BL C Hi Low BL GN L N BL PK PK YL GY YL YL WH WH WH WH WH WH WH C L C L WH WH WH STIRRER MOTOR YL C NO WH WH WH SYMBOL COLOR WHITE BLACK RED YELLOW PINK BLUE BROWN GREEN BK RD YL PK BL BR GN GREY GY WIRE COLORS 1 3 5 7 9 11 13 15 WH WH W...

Page 10: ...LP N C 5 0 POTATO FROZEN ENTREE LIGHT HI LO OFF CUSTOM SET DEFROST 6 1 BEVERAGE DINNER PLATE EZ on CLOCK 7 2 RICE HOLD WARM POWER KITCHEN TIMER FRESH VEGETABLE LIGHT TIMER N C 8 3 PIZZA CASSEROLE START STOP CLEAR 9 4 SOUP SAUCE BACON CUSTOM COOK LESS MORE N C TURNTABLE ON OFF 8 9 10 11 12 13 5 2 ...

Page 11: ...ht comes on The unit will begin cooking and the display window will show the time counting down by seconds D After about 5 minutes make sure the primary interlock switch the secondary interlock switch and the interlock monitor switch operate properly by opening and closing the door several times Touch the START key each time the door is closed E Continue operating the unit Two short and a long bee...

Page 12: ...All service adjustments should be made for minimum microwave energy leakage readings 3 Do not operate the unit until it is completely repaired if any of the following conditions exist The unit must not be operated a The door does not close firmly b The hinge is broken c The door seal is damaged d The door is bent or warped or there is any other visible damage on the unit that may cause microwave e...

Page 13: ... for microwave leakage after every servicing The power density of the microwave radiation leakage emitted by the microwave oven should not exceed 4 mW cm2 Always start measuring of an unknown field to assure safety for operating personnel from radiation leakage EQUIPMENT TESTER VOLTS DC AC Ohmmeter Microwave survey meter Holaday HI 1500 HI 1501 Narda 8100 8200 600 cc non conductive material beaker...

Page 14: ...rgy leakage not be more than 2 mW cm2 after determining that all parts are in good condition functioning properly and genuine replacement parts which are listed in this manual have been used 3 At least once a year have the electromagnetic energy leakage monitor checked for calibration by its manufacturer 1 Microwave power output measurement is made with the microwave oven supplied at its rated vol...

Page 15: ...igures 1 2 and 3 1 Remove a screw securing the control panel assembly to the oven cavity 2 Remove the control panel with pushing it upward 3 Remove the three connectors CN1 CN2 and wire leads Relay2 and Relay6 from the circuit board CAUTION The relay connector 2 White and 6 Red must be correctly connected Relay 2 and Relay 6 for each These two connectors are not interchangeable 4 Remove 3 screws s...

Page 16: ... F P C connector into the terminal socket securely with the fingers 2 Hold the plastic fastener with thumb and forefinger of the other hand and push it slowly into the terminal socket Figure 6 NOTE When reconnecting the F P C connector make sure that the holes on the F P C connector are properly engaged with the hooks on the plastic fastener 3 Lock the level of the plastic fastener into the hook o...

Page 17: ... the base plate by removing six screws securing it to the out case Remove the Mount All from the out case by removing two screws securing it to the out case and one screw securing it to the ventilation motor ASS Y and cavity 6 Remove the power cord cover from outcase by removing a screw 7 Remove the power cord to the inner of the out case with turning power cord and remove the out case with pushin...

Page 18: ...ch Board Secondary Interlock Switch Interlock Monitor Switch Primary Interlock Switch Latch Board WH from H V Transformer YL from Fan Motor WH from Power Cord WH from cooktop lamp Secondary Interlock Switch Monitor Interlock Switch Primary Interlock Switch PK from P C B BL from P C B WH from H V Transformer BR from Turntable Motor RD from H V Transformer Figure 9 Figure 10 WIRE COLOR SYMBOL COLOR ...

Page 19: ...ven back plate air duct and front bracket Figure 13 5 Remove four tap tite screws securing the magnetron to the wave guide Figure 14 6 Remove the magnetron VERY CAREFULLY NOTES When removing the magnetron make sure that its dome does not hit any adjacent parts or it may be damaged When replacing the magnetron be sure to install the magnetron gasket in the correct position and be sure that the gask...

Page 20: ...Remove the dielectric choke by using knife blade or small screw driver etc 2 Remove two screws securing it to the door handle CAUTION Be careful not to damage door seal plate with the screwdriver NOTES After replacing the door be sure to check that the primary interlock switch the secondary interlock switch and the interlock monitor switch operate normally After replacing the door check for microw...

Page 21: ...operly microwaves may leak from the clearance between the door and the oven I REMOVING THE VENTILATION FAN ASS Y 1 Remove the mounting plate by removing two screws securing it to the back plate See Figure 19 2 Remove the two screws securing the MOUNT ALL and one screw securing the ventilation fan ASS Y See Figure 20 a 3 Carefully pull the ventilation motor ASS Y out of the microwave oven See Figur...

Page 22: ... Figure 23 NOTES Remove the leadwire from the turntable motor VERY CAREFULLY Be sure to grasp the connector not the wires when removing K REMOVING THE STIRRER FAN MOTOR 1 Remove all screws from out case and remove the out case 2 Remove 5 screws securing the air duct to the oven cavity and remove 2 screws securing the stirrer fan motor to the bracket Figure 24 3 Lift the air duct and disconnect the...

Page 23: ...justment of the latch board may not be necessary Go to Steps 5 and 6 to check the sequence of the switches NOTE To correct sequence of the Primary Interlock Switch Secondary Interlock Switch and the Interlock Monitor Switch is very important If any gap is larger than 1 64 0 5 mm you will need to adjust the latch board Go to step 3 and follow all steps in order ADJUST THE LATCH AND SWITCH CLOSING 3...

Page 24: ...ro to the body of the switches in the following sequence Interlock Monitor Switch Primary Interlock Switch Secondary Interlock Switch NOTE The Interlock Monitor Switch is an added safety check on the Primary and Secondary Interlock Switches If the Primary and Secondary Interlock Switches allow the oven to operate with the door open the Monitor Switch will blow the fuse 7 When you achieve the prope...

Page 25: ...n closed circuit When the secondary switch operation is abnormal make the necessary adjustment or replace the switch only with the same type of switch C MONITOR SWITCH TEST Disconnect the wire lead from the monitor switch Connect the ohmmeter leads to the common COM and normally closed NC terminals of the switch The meter should indicate closed circuit in the door open condition When the door is c...

Page 26: ... each filament terminal of the magnetron and the chassis ground with an ohm mater on high test scale 1 Measure the resistance With an ohm meter on Rx1 scale a Primary winding b Filament winding c Secondary winding 2 Measure the resistance With an ohm meter on highest scale a Primary winding to ground b Filament winding to ground Normal reading Less than 1 ohm Normal reading Infinite ohms NOTE Repl...

Page 27: ...tinuity 1 Forward Ohm meter Figure 29 a 1 Reverse Ohm meter Figure 29 b Normal reading Momentarily indicates several ohms and then gradually returns to infinite ohms Abnormal reading Indicates continuity or infinite ohms from the beginning Normal readings Infinite Abnormal reading Indicates continuity Normal readings continuity Abnormal reading Infinite Normal readings Infinite Abnormal reading co...

Page 28: ...sistance between terminal pins of connector KEY CONNECTOR NOTE When reconnecting the FPC connector make sure that the holes on the FPC connector are properly engaged with hooks on the plastic fastener MATRIX CIRCUIT FOR TOUCH KEY BOARD CONNECTOR KEY CON 7 17 COMPONENTS TEST PROCEDURES RESULTS TOUCH KEY BOARD RESISTOR CIMENT Resistance value When When not touched touched Less than More than 400 ohm...

Page 29: ...ock monitor switch Malfunction of the high voltage transformer the high voltage capacitor including the diode the magnetron the blower motor or the circuit board PROBLEMS CAUSES POWER LEVEL 1 2 3 4 5 6 7 8 9 10 4 sec 6 sec 8 sec 10 sec 12 sec 14 sec 16 sec 18 sec 20 sec 22 sec 18 sec 16 sec 14 sec 12 sec 10 sec 8 sec 6 sec 4 sec 2 sec 0 NOTES If the fuse is blown by an improper switch operation re...

Page 30: ... the unit still operate GOOD Replace the circuit board Replace RELAY1 PROBLEM B FAN motor and oven lamp turn on When the door is closed and START key is touched Measure the voltage at pin NO 35 of U01 or 7of U03 Voltage reading 0 Vdc Replace the circuit board Defective RELAY1 or poor connection of RELAY1 Defective RELAY1 Replace RELAY1 or correct the connection NO NO YES YES NO NO YES YES GOOD ...

Page 31: ...he interlock switches the door sensing and the relay check good 2 The unit with a normal relay continuously operates 3 Proper temperature measurement is not obtained 4 The buzzer does not sound or continues to sound 5 Some segments of one or more digits do not light up or they continue to light up or segments light when they should not 6 Wrong figures appear 7 The figures of all digits 8 Some of t...

Page 32: ...ION on page 6 1 ƒU DISPLAY Problems A thru C ƒU HELP UP Problems D thru E ƒU BUZZER Problems F WH RD Measure voltage between pin 1 and pin 3 of connector CN1 Runs Runs Runs Runs Runs 0 120 Measure resistance of touch key board after removing connector S1 See page 7 4 and 7 17 0 120 120V Replace circuit board Normal circuit board Normal resistance Voltage incorrect Normal resistance Resistance inco...

Page 33: ...rrect seating Normal circuit board Normal contact Poor contact Normal Primary switch No continuity Adjust or replace door sensing switch Measure resistance of H V capacitor see page 7 16 Resistance incorrect Normal resistance Normal operation No operation Replace thermostat Normal thermostat Measure resistance of fan motor 38 8 ohms Resistance incorrect Replace fan motor Normal fan motor Normal ci...

Page 34: ...ect Normal H V C Abnormal Replace H V D Normal Magnetron Replace Magnetron Normal Normal H V D Check the continuity of H V D see page 7 16 Replace H V C Normal resistance Replace H V T Normal resistance NO continuity Replace circuit board Normal circuit board Poor contact Replace circuit board Normal circuit board Contact OK Normal contact Correct seating Check contact of connector S1 Runs Runs Ru...

Page 35: ...7 24 PROBLEM F No buzzing when touching the key between stages or at end of cooking 1 Normal circuit board Check normal operation circuit board Replace circuit board Runs ...

Page 36: ... contact Replace magnetron thermal fuse and oven thermostat Poor contact Replace circuit board Normal circuit board Contact OK Normal contact Correct seating Check contact of connector S1 see page 7 4 Runs Replace ventilation motor ASS Y NO runs Normal ventilation motor ASS Y Check the contact of magnetron thermal fuse and oven thermostat ...

Page 37: ...8 1 EXPLODED VIEW DOOR PARTS 1000 1008 1002 1001 1006 1005 1007 1004 1003 W105 ...

Page 38: ...8 2 CONTROLLER PARTS 2000 2005 2001 2003 2002 2004 2007 W083 2010 ...

Page 39: ...8 3 OVEN CAVITY PARTS 3003 3007 3019 3020 3015 3030 3015 3013 3008 3030 W106 W106 W106 3031 3031 3009 3010 3017 3018 3002 3001 3000 3016 3006 3011 W101 3014 ...

Page 40: ...8 4 LATCH BOARD PARTS 4001 4002 4001 4003 4000 W030 ...

Page 41: ...8 5 INTERIOR PARTS I T O P 5000 5019 5018 5017 5016 5012 5013 5014 5009 5005 W081 W067 W074 5004 W067 5008 5010 5006 5001 5002 5003 W067 5015 W101 W101 W101 W049 5020 ...

Page 42: ...8 6 INTERIOR PARTS II 5111 5100 W110 5115 W106 5101 5106 W106 5109 5108 5105 5110 W091 5113 5114 5104 W067 5102 5112 5117 ...

Page 43: ...8 7 INSTALLATION PARTS 6011 W141 W106 6002 6001 6005 6003 6008 6006 6004 6007 6013 6012 6009 6010 6007 ...

Page 44: ...8 15 SCHEMATIC DIAGRAM OF P C B ...

Page 45: ...8 16 PRINTED CIRCUIT BOARD ...

Page 46: ...6K 1 6W 5 1 R63 0RD5601F608 CARBON 5 6K 1 6W 5 1 R64 0RD5601F608 CARBON 5 6K 1 6W 5 1 R65 0RD5601F608 CARBON 5 6K 1 6W 5 1 8 17 See Illustration PRINTED CIRCUIT BOARD PCB PARTS LIST NO PART NO SPECIFICATION Q TY INTEGRATED CIRCUITS U01 0IHI404339U HD404339S A80S 1 U03 0IKE650040A KID65004AP 1 PH1 0ISH201200A S201DH2 1 TRANSISTORS Q01 OTR101509AB KTA1015 KTA1266 KEC 1 Q02 OTR101509AB KTA1015 KTA126...

Page 47: ...O PART NO SPECIFICATION QTY MISCELLANEOUS CU1 4850W4C001A CUSHION 3 5MM 1 DP1 6302W5A002A SVM 07SS15 7 MT 213GN 1 RY1 6920W2D010A RELAY OJ SS 112LM 1 RY2 6920W2D014A RELAY DU1PU 1 RY3 6920W2D010A RELAY OJ SS 112LM 1 RY4 6920WRD007A RELAY VG12HE 1 RY5 6920W2D010A RELAY OJ SS 112LM 1 RY6 6920W2YD04A RELAY OZF S 112LM1P 1 BZ1 6908W3YA01A BUZZER GPB B 26B2 1ES 1 VR1 CQ33026A VARISTOR INR14D271 1 VR2 C...

Page 48: ...P NO 3828W5S0813 June 1998 Printed in Korea ...

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