Samsung M1774 Service Manual
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Samsung M1774 Service Manual

Samsung M1774 Service Manual

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SERVICE
MICROWAVE OVEN
MICROWAVE OVEN
M1774
Manual
8. PCB Diagrams
CONTENTS

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Summary of Contents for Samsung M1774

  • Page 1: Table Of Contents

    MICROWAVE OVEN M1774 SERVICE Manual MICROWAVE OVEN CONTENTS 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...

  • Page 2: Precaution

    CENTRAL SERVICE CENTER 16. Always connect a test instrument's ground lead to the instrument chassis ground before 10. Service technicians should remove their connecting the positive lead; always remove watches while repairing an MWO. 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

    FROM 100 TO 850W (IEC-705 TEST PROCEDURE) OPERATING FREQUENCY 2,450MHz MAGNETRON OM75SH(31) COOLING METHOD COOLING FAN MOTOR OUTSIDE DIMENSIONS 489(W) x 275(H) x 370(D) 2-2 Comparison Chart AUTO REHEAT AUTO COOK POWER LEVEL TIME SETTING AND WEIGHT AUTO DEFROST DEODORIZATION Samsung Electronics...

  • Page 5: Operating Instructions

    Auto Reheat/Cook Selection Defrost Selection Power Level Button Deodorization Button Time Setting Selection Start Button Cancel Button 3-2 Features & External Views Door Light Safety Interlock Holes Ventilation Holes Control Panel Glass Plate Roller Ring Door Latches Coupler 489mm 370mm Samsung Electronics...

  • Page 6: Disassembly And Reassembly

    VOLTAGE TRANSFORMER secondary and filament terminals. It is extremely dangerous to work on or near these circuits with the oven energized. Screws H. V. Trans DO NOT measure the voltage in the high voltage circuit including filament voltage of magnetron. Samsung Electronics...

  • Page 7: Replacement Of Door Assembly

    0.5mm or less. Door "A" 4-3-4 Removal of Key Door & Spring Remove pin hinge from Door "E" Key Door Detach spring from Door "E" and key door. Hook to hang the key spring Spring Door "A" Samsung Electronics...

  • Page 8: Replacement Of Fuse/Drive Motor

    Drive Motor Cover 8. Connect all the leads to the drive motor. 9. Screw the deive motor cover to the base plate with a screw driver. 10. Remount the coupler in the correct position. Samsung Electronics...
  • Page 9 3. Lift up the control circuit board from the Ass'y Connector control box. 4. When reconnecting the FPC connector, make sure that the holes on the connector are properly screw engaged with the hooks on the Plastic Fastener. Samsung Electronics...

  • Page 10: Alignment And Adjustments

    2. Isolate the magnetron from the circuit by disconnecting its leads. 3. A continuity check across the magnetron filament terminals should indicate one ohm or less. 4. A continuity check between each filament terminal and magnetron case should read open. Cooling Fins Samsung Electronics...

  • Page 11: High Voltage Capacitor

    ¥ Primary switch 5. Confirm that the gap between the switch ¥ Monitor switch (COM-NC) housing and the switch actuator is no more than ¥ Monitor switch (COM-NO) 0.5mm when door is closed. ¥ Door Sensing S/W 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 E) by a factor of 91 times the of centigrade temperature. Samsung Electronics...

  • Page 13: Procedure For Measurement Of Microwave Energy Leakage

    ; CENTRAL SERVICE CENTER 5-13-2 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, H.V.Fuse 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

    C-OIL;950nF,2.1KV,BK,35x54x80,20mm DE59-40001A DIODE-H.V;HVR-1X-32B-12 DE91-70061B ASSY-H.V.FUSE;THV060T-0750-H,5KV0.75A,RED DE61-40017A FOOT;PP(A353),BLK,MW5630T DE31-10154A MOTOR-DRIVE;M2HJ49ZR02,ST-16,50/60HZ DE80-10003B BASE-PLATE;SGCC1-Z,T0.8,W340,L550,3RD-0.7 DE94-00097A ASSY CONTROL-BOX;230V50HZ,M1774,P-WHT,FISH2 DE92-40182M ASSY DOOR;M1774/XEF,P/WHT,3RD-FISH2 DE71-60450B COVER-MGT;PP,T2,W110.5,L109,-,28G,3RD-0.7 DE39-00052A WIRE HARNESS-A;230V50HZ,-,-,M1774/XEF,3RD FISH2 DE47-20173A THERMOSTAT;PW-2N(90/60)30,187Y,250V7.5A,9 CAVITY DE64-40008B DOOR-C;PP,T1.5,BLK,CE745G DE73-90027A FERRITE-CORE;NI-ZN,T13.8,W21.0,L28.0,BNF-14 : Warning : Option Parts :Electrostatically Sensitive Devices Samsung Electronics...

  • Page 18: Door Parts List

    FILM-DOOR;PET,T0.13,W23,L177.9,-,M759 DE64-40277B DOOR-A;ABS(HR-0370),200G,WHT(W9501),M DE64-40278E SCREEN-DOOR;ACRYL,-,-,-,SMOG,M1774,3RD-FISH2 DE92-50133C ASSY DOOR-E;MW4593G,-,BLK,3RD-0.7 DE61-70033A SPRING-KEY;ES,HSWR10,PI0.6,D6.0,L22.3,BLU DE64-40264C DOOR-KEY;POM(F20-02),5g,BLK,-,2ND HANDL DE61-80005A HINGE-UPPER;SCP1,T2.3,ZN-COATIN,M745 DE61-80004A HINGE-LOWER;SCP1,T2.3,ZN-COATING,M745 DE92-40196L ASSY DOOR-A;M1774/XEF,P/WHT,3RD-FISH2 7-4 Control Parts List Ref. No. Parts No. Description/Specification Q'ty Remarks DE71-00005A COVER-PANEL;ABS(HR0370),-,-,-,P-WHT,M1774/XEF DE66-00013A BUTTON-SELECT(A);ABS(HR0370),-,-,P/WHT DE67-00003A WINDOW-DISPLAY;SAN,-,-,-,SMOG,M1774 DE72-00009A CONTROL-PANEL;M1774,-,-,-,-,P-WHT,FISH2 DE66-00014A BUTTON-SELECT(B);ABS(HR0370),-,-,P-WHT,M1774/XEF...

  • Page 19: Standard Parts List

    DE60-10082H SCREW-A;2S-4X12,TOOTHED O/PANEL DE60-10098A SCREW-ASSY TAP TITE;PH,TC,M4X8,SWRCH18A,ZPC2,GLD,W CAVITY TCO DE60-10098A SCREW-ASSY TAP TITE;PH,TC,M4X8,SWRCH18A,ZPC2,GLD,W D/MOTOR DE60-10098A SCREW-ASSY TAP TITE;PH,TC,M4X8,SWRCH18A,ZPC2,GLD,W MGT TCO DE60-30016A NUT-FLANGE;M4,MSWR10 F-MOTOR DE60-10069A SCREW-TAP TH;TH,M4,L10,FRFZY SCR/DOOR DE60-10088A SCREW-TAP PH;PH,M3,L8,FEFZY,PLAIN DE60-10098A SCREW-ASSY TAP TITE;PH,TC,M4X8,SWRCH18A,ZPC2,GLD,W H.V.D 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 3501-001050 RELAY-MINIATURE;24VDC,200mW,5A,1FormA,10mS,5mS RY01,RY02 3501-001062 RELAY-POWER;24VDC,523.2mW,16A,1FormA,15mS, RY03 3601-001126 FUSE-FERRULE;250V,1.6A,QUICK-ACTING,CERAMIC FUS1 3708-001315 CONNECTOR-FPC/FC/PIC;12P,2mm,STRAIGHT,SN CN05 DE07-20126A LED DISPLAY;LTC-4638G,GRN,12,30,48.2X22.38 DSP1 DE09-00035A IC-MCU;HD404316-D83S,M1974,4BIT IC01 DE13-20013A IC-DRIVE;KA2657,DIP IC03 DE26-20146A TRANS-L.V;SLV-745EN,230V,50HZ,AC17/7V LVT1 DE30-20016A BUZZER;CBE2220BA,STICK BUZ1 DE34-20071A SWITCH-ROTARY;DC10V,1MA,SH,PA-1005A-003-000 ECD1 DE39-40723A WIRE HARNESS;DC35V,C-959G,80mm,12PIN WIR1 DE47-40024A HOLDER-FUSE;FH-51H,7.5A FUS1 Samsung Electronics...

  • Page 22: Schematic Diagrams

    9. Schematic Diagrams 9-1 Schematic Diagrams Samsung Electronics...

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