Download  Print this page

Samsung MW7490W Service Manual

Hide thumbs

Advertisement

Advertisement

loading

  Also See for Samsung MW7490W

  Summary of Contents for Samsung MW7490W

  • Page 1: Table Of Contents

    MICROWAVE OVEN MW7490W SERVICE Manual CONTENTS MICROWAVE OVEN 1. Precaution 2. Specifications 3. Operating Instructions 4. Disassembly and Reassembly 5. Alignment and Adjustments 6. Troubleshooting 7. Exploded Views and Parts List 8. PCB Diagrams 9. Schematic Diagrams SECA...
  • Page 2: Precaution

    10. Service technicians should remove their 16. Always connect a test instrument's ground watches while repairing an MWO. lead to the instrument chassis ground before connecting the positive lead; always remove the instrument's ground lead last. Samsung Electronics...
  • Page 3 (Use a screwdriver.) 3. High voltage is maintained within specified limits by close-tolerance, safety-related components and adjustments. If the high voltage exceeds the specified limits, check each of the special components. Fig. 1-1. Discharging the High Voltage Capacitor Samsung Electronics...
  • Page 4: Specifications

    2. Specifications 2-1 Table of Specifications MODEL MW7490W ITEM TIMER 99 MINUTES 99 SECONDS POWER SOURCE 120V/60HZ, AC POWER CONSUMPTION MICROWAVE : 1,450W OUTPUT POWER FROM 100W TO 1000W (10 LEVEL POWER) (IEC-705 TEST PROCEDURE) OPERATING FREQUENCY 2,450MHz MAGNETRON OM75PH(31)ESS...
  • Page 5: Operating Instructions

    Kitchen Kitchen Timer Button Clock Clock Button Timer Pause Pause/Canel Button Start Button Start Cancel MW7490W 3-2 Features & External Views Light Safety Interlock Holes Ventilation Holes Door Control Panel Door Latches Open Door Push Button Guide Roller Glass Tray...
  • Page 6: Disassembly And Reassembly

    4-2 Replacement of High Voltage Transformer 1. Discharge the high voltage capacitor. 2. Disconnect all the leads. 3. Remove the mounting bolts. 4. Reconnect the leads correctly and firmly. Samsung Electronics...
  • Page 7: Replacement Of Door Assembly

    • Insertion depth of the thin metal plate should be 0.5mm or less. 4-3-3 Removal of Key Door & Spring Door "E" Remove pin hinge from Door "E" Detach spring from Door "E" and key door. Key Door Spring Samsung Electronics...
  • Page 8: Replacement Of Fuse/Drive Motor

    7. When replacing the drive motor, be sure to remount it in the correct position with the Drive Motor Cover Base Plate coupler. 8. Connect all the leads to the drive motor. 9. Screw the drive motor cover to the base plate with a screw driver. Samsung Electronics...
  • Page 9 3. When installing new membrane key board, make sure that the surface of escutcheon base is cleaned sufficiently so that any problems (shorted contacts or uneven surface) can be avoided. Membrane Panel Samsung Electronics...
  • Page 10: Alignment And Adjustments

    5-1 High Voltage Transformer 1. Remove connectors from the transformer terminals Filament Terminals and check continuity. 2. Normal resistance readings are as follows: Primary Terminals MODEL MW7490W Ω ± 10% Secondary 88.0 Filament Shows Continuity Primary 0.32Ω ± 10% (Room temperature = 20˚C)
  • Page 11: High Voltage Capacitor

    Door Open Door Closed procedures. ∞ Primary switch 5. Confirm that the gap between the switch ∞ Monitor switch (COM-NC) housing and the switch actuator is no more than ∞ Door Sensing S/W 0.5mm when door is closed. Samsung Electronics...
  • Page 12 NOTE 1: Variations or errors in the test procedure will cause a variance in the temperature rise. Additional power test should be made if temperature rise is marginal. NOTE 2: Output power in watts is computed by multiplying the temperature rise (step 5) by a factor of 91 times the of centigrade temperature. Samsung Electronics...
  • Page 13: Procedure For Measurement Of Microwave Energy Leakage

    ; CENTRAL SERVICE CENTER 5-12-2 At least once a year have the microwave energy survey meter checked for accuracy by its manufacturer. Samsung Electronics...
  • Page 14: Troubleshooting

    H.V.Transformer component test procedure and replace if it is H.V.Capacitor defective. H.V.Diode Magnetron 4. Open or loose wiring of power relay 5. Defective primary latch switch 6. Defective power relay or Ass'y PCB Replace PCB main. Samsung Electronics...
  • Page 15 Use plastic wrap or cover with a lid. Stir once or twice while cooking foods such as soup, cocoa, or milk. Noise from the turntable motor Noise may result from the motor. Replace turntable motor. when it starts to operate. Samsung Electronics...
  • Page 16: Exploded Views And Parts List

    7. Exploded Views and Parts List 7-1 Exploded Views Samsung Electronics...
  • Page 17: Main Parts List

    BASE-PLATE SGCC,T0.8,W404,L633,3RD-1.3 MW7896W,NO-HIN DE31-10154A MOTOR-DRIVE M2HJ49ZR02,ST-16,50/60HZ,- DE71-60449A COVER-MGT PP(TB53),25G,110.5X115,GE-WHT,3RD-1.3 MW789 DE93-30375R ASSY CONTROL-BOX MW7490W,WHT,3RD-1.3CU.FT,LCD2 DE92-40176G ASSY DOOR MW7490W,WHT,3RD-1.3CU.FT,NEW GUARD DE39-20037H ASSY POWER CORD 120V60HZ,-,L1150,CSA,MW5592W/XAC DE61-50574A BRACKET-TCO SECC/SPP,T0.6,-,-,-,3RD-1.3 MW7896W DE63-90035I CUSHION-RUBBER DFA20,T1.5,W190,L100,BLK,JE154 : Warning : Option Parts :Electrostatically Sensitive Devices Samsung Electronics...
  • Page 18: Door Parts List

    7-4 Control Parts List Ref. No. Parts No. Description Specification Q'ty Remarks DE66-20010A BUTTON-PUSH ABS(VH-080),WHT,17.6G,MW4370W, DE61-70076A SPRING-BUTTON HSWR,PI0.6 DE34-10207T SWITCH-MEMBRANE PET,MW7490W/XAC,-,-,-,-,-,3RD-1.3 DE72-70162A CONTROL-PANEL ABS,250G,T2.5 RA-W3LCD2-01 ASSY PCB PARTS DE93-30405J ASSY CONTROL-PANEL MW7490W,WHT,3RD-1.3CU.FT,NEWGUARD DE64-00044A WINDOW-COVER HIDDEN ABS(HR0370U),BLK,MW4390W,LCD-N/G DE67-40003E WINDOW-DISPLAY SAN,-,-,-,CLEAR,MW5490W,BLK PRINT 7-5 Body Latch Parts List Ref.
  • Page 19: Standard Parts List

    MO/FAN DE60-10082H SCREW-A 2S-4X12,TOOTHED P-C-EA DE60-10082H SCREW-A 2S-4X12,TOOTHED PN/OUT DE60-10082H SCREW-A 2S-4X12,TOOTHED S-M-EA DE60-10088A SCREW-TAP PH PH,M3,L8,FEFZY,PLAIN MGT-TCO DE60-10098A SCREW-ASSY TAP TITE PH,TC,M4X8,SWRCH18A,ZPC2,GLD,W M/DRIV DE60-10088A SCREW-TAP PH PH,M3,L8,FEFZY,PLAIN DE60-10098A SCREW-ASSY TAP TITE PH,TC,M4X8,SWRCH18A,ZPC2,GLD,W DIODE DE60-10012A SCREW-TAP TITE TH,+,3,M4,L10,SWR10,ZPC2,TOOTH Samsung Electronics...
  • Page 20 8. P.C.B Diagrams 8-1 P.C.B Diagrams Samsung Electronics...
  • Page 21 2802-000161 RESONATOR-CERAMIC 4MHz,0.5%,TP,10.0x5.0x7.5mm XTL1 3711-000881 CONNECTOR-HEADER BOX,3P,1R,2.5mm,STRAIGHT,SN CN10 3711-000940 CONNECTOR-HEADER BOX,4P,1R,2.5mm,STRAIGHT,SN CN03 3711-004143 CONNECTOR-HEADER BOX,2P/3P,1R,5mm/2.5mm,STRAIGH CN07 DE13-20009A KA7533,DIP IC02 DE39-60001A WIRE-SO COPPER PI0.6,SN,T,52MM,TAPING_WIRE J01,J02,J04,J05,J10 DE39-60001A WIRE-SO COPPER PI0.6,SN,T,52MM,TAPING_WIRE J11,J12,J13,J14,J15 DE39-60001A WIRE-SO COPPER PI0.6,SN,T,52MM,TAPING_WIRE J16,J17 DE09-00031A IC-MCU TMP87CH21AF-2454,MW4592W,8BIT IC01 Samsung Electronics...
  • Page 22: Schematic Diagrams

    AC 120V/60Hz POWER RELAY (SECONDARY INTERLOCK) MAGNETRON BLK BLU HIGH VOLTAGE DIODE TO CHASSIS PRIMARY SWITCH HIGH VOLTAGE CAPACITOR DOOR SENSING SWITCH MONITOR SWITCH BOTTOM CENTER SYMBOL COLOR ORANGE HIGH VOLTAGE WHITE TRANSFORMER BLACK BLUE BLU RED POWER RELAY Samsung Electronics...