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Goldstar MV-1155W Service Manual

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MICROWAVE OVEN

SERVICE MANUAL
MODEL : MV-1155W
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : 3828W5S0807
Website: http://biz.lgservice.com
Printed in Korea

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Summary of Contents for Goldstar MV-1155W

  • Page 1: Microwave Oven

    Website: http://biz.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL : MV-1155W CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. Printed in Korea P/NO : 3828W5S0807...

  • Page 2: Warning To Service Technicians

    CAUTION WARNING TO SERVICE TECHNICIANS 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. MECHANICAL SERVICE INFORMATION TABLE OF CONTENTS ADJUSTMENT PROCEDURES ........................... 3 PRECAUTIONS ON INSTALLATION ...........................

  • Page 4: Adjustment Procedures

    1. ADJUSTMENT PROCEDURES ADJUST THE LATCH AND SWITCH CLOSING (3) Loosen the two screws holding the plastic latch To avoid possible exposure to microwave energy board as shown. leakage, adjust the door latches and interlock switches, using the following procedure. (4) With the oven door closed tightly, move the latch board upward toward the top of the oven and/or away from the door latch until the gaps are less than...
  • Page 5 Latch Board Secondary Interlock Switch Oven Lamp Switch Interlock Monitor Switch Primary Interlock Switch Figure 1-a Latch 0.1/64" 0.1/64" — 4 —...

  • Page 6: Precautions On Installation

    2. PRECAUTIONS ON INSTALLATION A. Put a container filled with water (about 1 liter) into the oven, and close the door tightly. (Figure 2) B. Touch the STOP/CLEAR and the TIME keys. A. Plug the power supply cord into a 120V AC, 60Hz, C.
  • Page 7 SPECIFICATIONS Rated Power Consumption ......... 1300W maximum (Microwave oven only) 1500W maximum (Microwave oven+Cook top lamps+Ventilation fan) 1500W (Convection) Microwave Output ..........850W (IEC 705 TEST PROCEDURE) Adjustable 85W through 850W, 10 steps 1350W (Convection) Frequency ............2,450 MHz±50 MHz Power supply ............

  • Page 8: Overall Circuit Diagram

    6. OVERALL CIRCUIT DIAGRAM A. SCHEMATIC DIAGRAM — 7 —...
  • Page 9 B. MATRIX CIRCUIT FOR TOUCH KEY BOARD LIGHT CLOCK CONV. SENSOR MEAT BAKE HIGH POPCORN HOLD CONV. ROOM POULTRY BROIL WARM TEMP COMBI. FROZEN FISH BAKE TEMP STOP COMBI. LIGHT CUSTOM TIME /CLEAR ROAST HIGH COOK SENSOR AUTO LIGHT START POWER NIGHT COMBI.
  • Page 10 B. MATRIX CIRCUIT FOR TOUCH KEY BOARD LIGHT CLOCK CONV. SENSOR MEAT BAKE HIGH POPCORN HOLD CONV. ROOM POULTRY BROIL WARM TEMP COMBI. FROZEN FISH BAKE TEMP STOP COMBI. LIGHT CUSTOM TIME /CLEAR ROAST HIGH COOK SENSOR AUTO LIGHT START POWER NIGHT COMBI.

  • Page 11: Operating Procedures

    7. OPERATING PROCEDURES A. OVEN CONTROL PANEL Hold Warm - Used to keep hot, cooked foods safely warm in your Display - microwave oven up to Used to show time of 60 minutes. day, cooking time, cooking power level, Clock - and miscellaneous Used in setting time of indicators during...
  • Page 12 B. PANEL INSTRUCTIONS (Figure 4) The entire operation is done by simple touch control pads. (1) Display Window (6) START Key Numbers and letters explained in Figure 4 are shown Touch the START key after setting the desired in the display window (Vacuum Fluorescent Tube). cooking time etc.

  • Page 13: Procedure For Measuring Microwave Energy Leakage

    8. PROCEDURE FOR MEASURING B. MEASURING MICROWAVE ENERGY LEAKAGE MICROWAVE ENERGY LEAKAGE (1) Pour 275±15cc of 20±5°C water in a beaker which is graduated to 600cc, and place the beaker in the A. CAUTIONS center of the oven. (1) Be sure to check a microwave emission prior to (2) Set the energy leakage monitor to 2,450MHz and servicing the oven if the oven is operative prior to use it following the manufacturer's recommended...
  • Page 14 D. MEASUREMENT WITH A FULLY G. POWER OUTPUT MEASUREMENT ASSEMBLED OVEN (1) 1. Fill two test bowls with each 59°F (15°C)- (1) After all components, including the outer panels, are 75°F(24°C) 1 liter water respectively. 2. Use accurate thermometer (°F or °C) and fully assembled, measure for microwave energy measure each water temperature repsectively.

  • Page 15: Disassembly Instructions

    9. DISASSEMBLY INSTRUCTIONS IMPORTANT NOTES: UNIT MUST BE DISCONNECTED FROM ELECTRICAL OUTLET WHEN MAKING REPAIRS, REPLACEMENTS, ADJUSTMENTS AND CONTINUITY CHECKS. WAIT AT LEAST ONE MINUTE, UNTIL THE HIGH VOLTAGE CAPACITOR IN THE HIGH VOLTAGE Circuit Board POWER SUPPLY HAS FULLY DISCHARGED. THE CAPACITOR SHOULD BE DISCHARGED BY USING INSULATED WIRE-I.E.
  • Page 16 HOW TO REMOVE THE F.P.C. CONNECTOR HOW TO INSERT THE F.P.C. CONNECTOR Follow the steps below as illustrated Figures 10 and 11 Follow the steps below as illustrated in Figures 12 and to remove the F.P.C. connector. 13 to insert the F.P.C. connector. (1) Hold the edges of the plastic fastener with thumb and (1) Insert the F.P.C.
  • Page 17 B. REMOVING THE OUT CASE (1) Remove the vent grille by removing two screws (5) Remove the power cord cover from outcase by securing it to the outcase. removing a screw. (2) Remove two screws securing it to the front bracket. (6) Push the power cord to the inner of the outcase and remove the outcase.
  • Page 18 C. REMOVING THE PRIMARY INTERLOCK SWITCH, INTERLOCK MONITOR SWITCH AND SECONDARY INTERLOCK SWITCH (Figures 15, 16) (1) Disconnect the wire leads from the primary interlock switches. (2) Remove two screws securing the Latch Board. (3) Make necessary replacement and check microwave energy leakage according to "1.
  • Page 19 D. REMOVING MAGNETRON (Figures 17 through 21) (10) Remove the guide suction by removing three screws securing it to the bottom plat-R, oven front (1) Remove the vent grille by removing two screws. plate and magnetron. (Figure 20) (2) Remove the controller by removing a screw and (11) Remove four tap tite screws securing the disconnect all wire leads.
  • Page 20 E. REMOVING STIRRER FAN DISK NOTES (Figures 22, 23) After replacing the door, be sure to check that the primary interlock switch the secondary interlock switch (1) Remove ceramic plate. and the interlock monitor and the lamp switch operate (2) Remove the stirrer fan disk. normally.
  • Page 21 H. REMOVING THE VENTILATION FAN ASM (1) Remove the mounting plate by removing three screws securing it to the back plate. (See Figure 26) (2) Remove the two screws securing the ventilation fan asm. (See Figure 27) (3) Carefully pull the ventilation motor asm out of the microwave oven.
  • Page 22 I. REMOVING CONVECTION HEATER AND THERMISTOR (Figure 29) (1) Remove the out case. (6) Remove the thermistor by removing one screw securing the chamber-out plater. (2) Remove the air duct by removing five screws securing it to the oven front plate, guide air and (7) Remove the five screws securing the glasswool-L glasswool-R cover.

  • Page 23: Precautions And Repair Service Tips

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

  • Page 24: Test And Checkout Procedures, And Troubleshooting

    11. TEST AND CHECKOUT PROCEDURES, AND TROUBLESHOOTING Filament Winding CAUTIONS Secondary DISCONNECT THE POWER SUPPLY CORD FROM Winding THE WALL OUTLET WHENEVER REMOVING THE CABINET FROM THE UNIT. PROCEED WITH THE TESTS ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER.
  • Page 25 COMPONENTS TEST PROCEDURE RESULTS HIGH-VOLTAGE Normal reading: Measure the resistance: CAPACITOR 1) Terminal to terminal. Momentarily indicates several ohms, and then gradually returns to infinite ohms. Ohm- meter Abnormal reading: Indicates continuity or infinite ohm from the beginning. Figure 31-a 1) Terminal to case.
  • Page 26 COMPONENTS TEST PROCEDURE RESULTS SWITHCHES Check for the continuity of the switch (Wire leads are with an ohm-meter removed) DOOR OPEN DOOR CLOSED Secondary Terminals "COM" and Interlock "NO" of switch Terminals "COM" and Primary "NO" of switch Interlock Terminals "COM" and "NO"...
  • Page 27 COMPONENTS TEST PROCEDURE RESULTS Measure the resistance with an ohm- Normal reading: FAN MOTOR TOWER meter on Rx1 scale. MOTOR CIRCULATIONS MOTOR (Wire leads are Tower Cir. removed) 30-45 60-75 25-40 ohms. Figure 34 Measure the resistance across pins 5 & THERMISTOR Normal reading: 6 with an ohm-meter on Rx1 scale.
  • Page 28 COMPONENTS TEST PROCEDURE RESULTS SYNCHRONOUS Measure the resistance with an ohm- Normal reading: Approx. 3~4 Kohms. MOTOR meter on Rx10000 scale. (Wire leads are removed) Figure 38 Cooking Start RELAY 1 of P. C. B <Disconnect the 10 pin connector (CN 1) from P.C.B>...
  • Page 29 COMPONENTS TEST PROCEDURE RESULTS RELAY 2 POWER Check for continuity of the relay 2 with LEVEL an ohm-meter. (Remove wire leads from relay 2 and operate the unit on microwave cooking 4 sec 18 sec mode.) 6 sec 16 sec 8 sec 14 sec 10 sec...

  • Page 30: Checkout Procedures

    COMPONENTS TEST PROCEDURE RESULTS TOUCH KEY BOARD Measure the resistance between When When not terminal pins of connector KEY CON. touched touched Resistance value NOTE Less than More than When reconnecting the F.P.C 400 ohms 1 M ohm connector, make sure that the holes on the F.P.C.
  • Page 31 (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 Good of I/O CON from the circuit board. Does the unit still operate? Replace the Defective circuit board...
  • Page 32 (3) CHECKOUT PROCEDURES FOR CIRCUIT BOARD. The following symptoms indicate a defective circuit 5) Some segments of one or more digits do not light up, board. or they continue to light up, or segments when they should not. 1) The start function fails to operate but the high voltage systems, the interlock switches, the door sensing and 6) Wrong figures appear.
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  • Page 39: Exploded View

    #EV# EXPLODED VIEW DOOR PARTS MODEL: MV-1155W 13581A WSZ153 13552A 34774U 13213A 14760A 14890A 13720D WTT024 14026A 14760A 14970A WTT024 34774U WTT024 13650A — 37 —...

  • Page 40: Controller Parts

    #EV# CONTROLLER PARTS 24781M WTT021 268711 24810P 26638A 23572A WTT021 WTT028 WTT021 — 38 —...

  • Page 41: Oven Cavity Parts

    #EV# OVEN CAVITY PARTS 56411A WTT021 WTT021 Manual, operation WTT021 33550P WTT029 33112U Installation Instruction 548112 WTT021 WTT021 34810Q WTT021 WTT022 WTT022 348101 WTT021 WTT021 56804A 53550A 33530A 63302A 368771 35026G 36912B WTT022 35230A 34890C 948505 34810T WTT022 — 39 —...

  • Page 42: Latch Board Parts

    #EV# LATCH BOARD PARTS 43501A 43500A WSZ085 466001 466003 466004 466002 43510A — 40 —...
  • Page 43 #EV# INTERIOR PARTS( I ) 54810A 56324A 56930M 55893A WTP004 WSZ002 WTT021 568771 WTT021 WTT021 WSZ002 50CZZH WTP013 54810C 56170D WSZ137 56851H 53300C 56851D WSZ002 53300B WTT021 — 41 —...
  • Page 44 #EV# INTERIOR PARTS( II ) 568771 WTP004 36549V WTT021 56930V WNZ017 WNZ017 545601 549741 WSZ153 36549C 56804A 549742 WTT021 WTT021 36549C 53550L 55262A WTT029 56912B 549743 549751 WSZ002 55231C WTT021 WTT021 546801 WTT021 53550A WTT021 56930C 568772 WTT022 WTP004 56820A WTT021 56549F WTT037...
  • Page 45 #EV# INTERIOR PARTS( III ) WTT021 WTT021 WTT021 53551S 53551L 568772 53551R WSZ002 WSZ002 — 43 —...
  • Page 46 #EV# INSTALLATION PARTS WSZ098 64360A WSZ136 WBZZ02 638582 63300M 638581 WTT021 WBZZ01 WTP013 65862D WSZ136 WBZZ01 65862B 63861A — 44 —...
  • Page 47 #EV# PLATE CHAMBER ASSY PARTS WNH003 WWS011 WWP008 WTT010 545602 54930A WTT021 54400A WTT021 54281A WTT010 55263A 54810A 533002 948503 56501A 34990A 35300S WMT002 WTT011 533001 55892A WTT011 WWP008 WWS011 WNH003 — 45 —...

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