Samsung M1874NR Service Manual
  1. Manuals
  2. Brands
  3. Samsung Manuals
  4. Microwave Oven
  5. M1874NR
  6. Service manual

Samsung M1874NR Service Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
MICROWAVE OVEN
M1874NR
SERVICE
Manual
MICROWAVE OVEN
CONTENTS
SRSC

Advertisement

Table of Contents
loading

Related Manuals for Samsung M1874NR

Summary of Contents for Samsung M1874NR

  • Page 1: Table Of Contents

    MICROWAVE OVEN M1874NR 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 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 (c) Before turning on microwave power operated with the door open. for any service test or inspection within (b) Make the following safety checks on the microwave generating all ovens to be serviced before activating...

  • Page 3: Precaution

    1. Precaution Follow these special safety precautions. Although the microwave oven is completely safe during ordinary use, repair work can be extremely hazardous due to possible exposure to microwave radiation, as well as potentially lethal high voltages and currents. 1-1 Safety precautions ( 11.
  • Page 4 1-2 Special Servicing Precautions (Continued) 17. When checking the continuity of the witches or transformer, always make sure that the power is OFF, and one of the lead wires is disconnected. 18. Components that are critical for safety are indicated in the circuit diagram by shading, or .

  • Page 5: Specifications

    2. Specifications 2-1 Table of Specifications TIMER 99 MINUTES POWER SOURCE 230V 50Hz, AC POWER CONSUMPTION MICROWAVE : 1,150W OUTPUT POWER FROM 100 TO 800W (IEC-705 TEST PROCEDURE) OPERATING FREQUENCY 2,450MHz MAGNETRON OM75S(31)ESS COOLING METHOD COOLING FAN MOTOR OUTSIDE DIMENSIONS 489(W) x 275(H) x 370(D)mm SHIPPING DIMENSIONS 557(W) x 329(H) x 434(D)mm...

  • Page 6: Operating Instructions

    3. Operating Instructions 3-1 Control Panel + 30 s 3-2 Features & External Views Door Safety Interlock Hole Light Ventilation Holes Control Panel Glass Plate Roller Ring Door Latches Coupler 206mm 342mm 370mm - 4 -...

  • Page 7: Disassembly And Reassembly

    4. Disassembly and Reassembly 4-1 Replacement of Magnetron, Motor Assembly and Lamp Remove the magnetron including the shield case, permanent magnet, choke coils and capacitors (all of which are contained in one assembly). 1. Disconnect all lead wires from the magnetron and lamp. 2.
  • Page 8 4-3 Replacement of Door Assembly 4-3-1 Removal of Door "C" Insert flat screwdriver into the gap between Door "A" and Door "C" to remove Door "C" . Be careful Door "A" when handling Door "C" because it is fragile. Then remove the assembly. Door "C"...
  • Page 9 4-3-4 Reassembly Test After replacement of the defective component parts of the door, reassemble it and follow the instructions below for proper installation and adjustment so as to prevent an excessive microwave leakage. 1. When mounting the door to the oven, be sure to adjust the door parallel to the bottom line of the oven face plate by moving the upper hinge and lower hinge in the direction necessary for proper alignment.
  • Page 10 4-6 Replacement of Control Circuit Board 4-6-1 Removal of Ass'y Control Box 1. Be sure to ground any static electric charge in your body and never touch the touch control circuitry. 2. Disconnect the connectors from the control circuit board. SCREW 3.

  • Page 11: Alignment And Adjustments

    5. Alignment and Adjustments PRECAUTION 1. High voltage is present at the high voltage terminals during any cook cycle. 2. It is neither necessary nor advisable to attempt measurement of the high voltage. 3. Before touching any oven components or wiring, always unplug the oven from its power source and discharge the high voltage capacitor.
  • Page 12 5-4 High Voltage Capacitor 1. Check continuity of the capacitor with the meter set at the highest resistance scale. 2. Once the capacitor is charged, a normal capacitor shows continuity for a short time, and then indicates 9M. 3. A shorted capacitor will show continuous continuity. 4.
  • Page 13 5-8 Output Power of Magnetron CAUTION MICROWAVE RADIATION PERSONNEL SHOULD NOT ALLOW EXPOSURE TO MICROWAVE RADIATION FROM MICROWAVE GENERATOR OR OTHER PARTS CONDUCTING MICROWAVE ENERGY. The output power of the magnetron can be measured by performing a water temperature rise test. Equipment needed : * Two 1-liter cylindrical borosilicate glass vessel (Outside diameter 190 mm) * One glass thermometer with mercury column...
  • Page 14 5-10 Procedure for Measurement of Microwave Energy Leakage 1) Pour 275±15cc of 20±5∞ C(68±9∞ F) water in a beaker which is graduated to 600cc, and place the beaker in the center of the oven. 2) Start to operate the oven and measure the leakage by using a microwave energy survey meter.

  • Page 15: Troubleshooting

    6. Troubleshooting PRECAUTION 1. CHECK GROUNDING BEFORE CHECKING FOR TROUBLE. 2. BE CAREFUL OF THE HIGH VOLTAGE CIRCUIT. 3. DISCHARGE THE HIGH VOLTAGE CAPACITOR. 4. WHEN CHECKING THE CONTINUITY OF THE SWITCHES OR TRANSFORMER, DISCONNECT ONE LEAD WIRE FROM THESE PARTS AND THEN CHECK CONTINUITY WITHOUT THE POWER SOURCE ON.
  • Page 16 6-1 Electrical Maltunction(continved) SYMPTOM CAUSE CORRECTIONS Oven lamp and fan motor turn on 1. Misadjustment or loose wiring Adjust door and latch switches. of primary latch switch 2. Defective primary latch switch Oven can program but timer 1. Open or loose wiring of does not start.

  • Page 17: Exploded Views And Parts List

    7. Exploded Views and Parts List 7-1 Exploded Views MD06 MD11 MD03 MD04 MD02 MM01 MM17 MD05 MD07 MD24 MD10 MD14 MM07 MM03 MD01 MM55 MM16 MM05 MB01 MC01 MC07 MB05 MM22 MC41 MM26 MM88 MB03 MC13 MM06 MB02 MM10 MB041 MC04 MC142...
  • Page 18 7-2 Main Parts List Code No. Description Specification Q'ty Remark MB01 DE96-00120B ASSY BODY LATCH M1717N,NC2000(HANDLE) MB02 3405-000175 SWITCH-MICRO 250V,15A,200gf,SPST-NO MB03 3405-000178 SWITCH-MICRO 250V,15A,200gf,SPST-NO MB041 DE66-00093A LEVER-SWITCH(A) NC2000,PP-TH53,-,-,-,-,NTR,HANDLE MB042 DE66-00094A LEVER-SWITCH(B) NC2000,PP-TH53,-,-,-,-,NTR,HANDLE MB05 DE72-00137A BODY-LATCH NC2000(0.6/0.8/1.2),PP,-,-,-,-,WHT,- MM01 DE70-00184P PANEL-OUTER MW850WA,C/STEEL,T0.5,P/WHT,- MM03 DE39-00147C WIRE HARNESS-A...
  • Page 19 MC04 DE61-70135A SPRING-BUTTON PI0.6,BUTTON-SELECT(C),BUTTON-SELECT(C),- MC06 DE67-00003B WINDOW-DISPLAY M1774,ACRYL,-,-,-,-,SMOG,- MC07 RC-22F207-07 ASSY PCB PARTS M1774NR,230V50Hz MC10 DE64-00079A KNOB-DIAL M1974,ABS(HR0370),-,-,-,-,-,-,PCB-1BD MC13 DE94-00389H ASSY CONTROL-PANEL -,M1874NR/BWT,PURE-WHT,CIS MC141 DE67-00038J BUTTON-SELECT(A) M1774R-1/BWT,-,-,-,-,NEW MC142 DE67-00035A BUTTON-SELECT(B) M1774,-,-,-,-,- MC15 DE64-00110A BUTTON-START M1774-1,ABS,-,-,P/WHT,- MC17 DE71-00005R COVER-PANEL M1774R/BWT,ABS(HR0370),-,-,-,-,-,M1774R/BWT MC23...
  • Page 20 7-4 Standard Parts List Code No. Description Specification Q'ty Remark DE60-10012A SCREW-TAP TITE -,SWR10,M4,L10,TH,+,-,3,ZPC2,- N/P EARTH DE60-10012A SCREW-TAP TITE -,SWR10,M4,L10,TH,+,-,3,ZPC2,- P/C EARTH DE60-10012A SCREW-TAP TITE -,SWR10,M4,L10,TH,+,-,3,ZPC2,- PCB EARTH DE60-10012A SCREW-TAP TITE -,SWR10,M4,L10,TH,+,-,3,ZPC2,- TCO-S/W DE60-10063A SCREW-TAP TH -,-,FEFN,-,TH,M4,-,L12,-,- O/PANEL DE60-10080B SCREW-WASHER -,2S,SWRCH18A,ZP2,PH,PI5,-,L10,-,- DE60-10080B SCREW-WASHER...

  • Page 21: Pcb Diagrams

    8. P.C.B Diagrams 8-1 P.C.B Diagrams - 19 -...
  • Page 22 8-2 P.C.B Parts List Code No. Description Specification Q'ty Remark 3501-001062 RELAY-POWER 24VDC,523.2mW,16A,1FormA,15mS, 3501-001155 RELAY-MINIATURE 24VDC,200MW,3000MA,1FORMA,10MS,10MS RY2,4 3601-001126 FUSE-CARTRIDGE 250V,1.6A,FAST-ACTING,CERAMIC,5x20mm FUS1 DE07-00021E LED DISPLAY CSQ-4246G-05,-,-,40seg,5digit,45.2*22.3*22,- DSP1 DE09-00205A IC MICOM TMP87CH47U-3CN1,SM-200109-AN,-,-,- DE26-00034A TRANS-L.V SLV-1933EN,230V,50Hz,7.0V/17V,-,35*11,PIN,- LVT1 DE30-20016A BUZZER CBE2220BA,STICK,-,-,-,-,-,-,- BUZ1 DE34-00063A SWITCH-PRESSURE DAIL,28VDC,10mA,24,-,JES1424GS ECD1 DE47-40024A...

  • Page 23: Schematic Diagrams

    9. Schematic Diagrams 9-1 Schematic Diagrams ASSY NOISE FILTER MGT TCO, CAVITY TCO PRIMARY S/W H.V.TRANS 230V MONITOR POWER CORD H.V.FUSE 230~50Hz (0.75A) H.V.C INRUSH RELAY P.T.C POWER RELAY (SECONDARY INTERLOCK) DOOR SENSING SWITCH MONITOR FUSE SYMBOL    COLOR GROUND NOTE (250V 1.6A) BROWN 1. INPUT : 230V ASSY PCB BORD 2. DOOR : OPEN BLUE YELLOW 3. LAMP : ON YELLOW/GREEN 4.            : ASSY NOISE FILTER PATTERN ORANGE 5.                        : PCB PATTERN WHITE BLACK...
  • Page 24 ELECTRONICS ©Samsung Electronics Co., Ltd. September 2001 Printed in Korea Code No. : DE68-02304A...

Table of Contents