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Samsung M1774R Service Manual
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Samsung M1774R Service Manual

Samsung M1774R Service Manual

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SERVICE
MICROWAVE OVEN
SRSC
MICROWAVE OVEN
M1774R (WHITE)
Manual
8. PCB Diagrams
CONTENTS

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Summary of Contents for Samsung M1774R

  • Page 1: Table Of Contents

    MICROWAVE OVEN M1774R (WHITE) 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 SRSC...
  • Page 2 (e) A Microwave leakage check to verify compliance with the Federal performance standard should be performed on each oven prior to release to the owner. Samsung Electronics...

  • Page 3: 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 4 (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 5: 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 6: 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 7: 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 8 ¥ 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 9 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 10 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 11: 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 12 ¥ 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 13 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 14 ; 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 15: 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 16 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 17: Exploded Views And Parts List

    7. Exploded Views and Parts List 7-1 Exploded Views Samsung Electronics...
  • Page 18 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 DE94-00097R ASSY CONTROL-BOX M1774R/BWT,P-WHT,FISH2,CMO DE94-00201G ASSY DOOR M1714R/BWT,P-WHT,FISH2 ,RUSSIA 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...
  • Page 19 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 DE60-10088A SCREW-TAP PH PH,M3,L8,FEFZY,PLAIN DE60-10069A SCREW-TAP TH TH,M4,L10,FRFZY SCR/DOOR 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 Exploded Views and Parts List 7-5 Control Parts List Ref. No. Parts No. Description Specification Q'ty Remarks DE71-00005R COVER-PANEL ABS(HR0370),-,-,-,P-WHT,M1774R/BWT DE66-00013H BUTTON-SELECT(A) ABS(HR0370),-,-,P-WHT,M1774R/BWT DE61-70135A SPRING-BUTTON PI0.6,BUTTON-SELECT(C),RE-431 DE67-00003B WINDOW-DISPLAY ACRYL,-,-,-,SMOG,M1774 DE72-00009R CONTROL-PANEL ABS,M1774R/BWT,-,-,-,-,P-WHT,FISH2 DE66-00014A BUTTON-SELECT(B) ABS(HR0370),-,-,P-WHT,M1774/XEF DE66-00016A BUTTON-CANCEL ABS(HR0370),-,-,P/WHT DE66-20182J BUTTON-START...
  • Page 21 8. P.C.B Diagrams 8-1 P.C.B Diagrams Samsung Electronics...
  • Page 22 RY01,RY02 3501-001062 RELAY-POWER 24VDC,523.2mW,16A,1FormA,15mS RY03 3601-001126 FUSE-FERRULE 250V,1.6A,FA,CERAMIC,5X20MM 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 DE09-00048A IC-MCU HD404316-E01S,M1774R/M1974R,4BIP,SDIP IC01 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...

  • Page 23: Schematic Diagrams

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