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Samsung DE7712N Service Manual

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SERVICE
Timer
Operationg Voltage
Breaking Voltage
Input Current
Power Consumption
Operating frequency
Output Power
Main Fuse
Dimensions(WxHxD)
Outside(mm)
Oven(mm)
Net/Gross Weight
WAECO

MICROWAVE OVEN

DE7712N
MICROWAVE OVEN
30 Minutes
24V DC
Min.21.5V, Max.29.5V
34A
820W
2,450MHz
500W (IEC-705)
32V DC, 80A
490 (W) X 282 (H) X 351 (D)
306 (W) X 190 (H) X 348 (D)
10.5 / 12.5 kg Approx.
Manual

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Summary of Contents for Samsung DE7712N

  • Page 1: Microwave Oven

    MICROWAVE OVEN DE7712N SERVICE Manual MICROWAVE OVEN Timer 30 Minutes Operationg Voltage 24V DC Breaking Voltage Min.21.5V, Max.29.5V Input Current Power Consumption 820W Operating frequency 2,450MHz Output Power 500W (IEC-705) Main Fuse 32V DC, 80A Dimensions(WxHxD) Outside(mm) 490 (W) X 282 (H) X 351 (D)

  • Page 2: Precautions To Be Observed Before And During Servicing To Avoid Possible Exposure To Excessive Microwave Energy

    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: Safety Precautions

    1. Precaution Follow these special safety precautions. Although the microwave oven is completely safe during ordinary use, repair work can be extremely hazrdous due to possible exposure to microwave radiation, as well as potentially lethal high voltages and currents. 1-1 Safety precautions ( 10.

  • Page 4: General Safety Requirements

    1. Precautions (Continued) 1-2 General safety Requirements 20. This appliance is equipped with a 18. If the oven is not going to be in use for a long condenser. Therefore, when relocating the period of time, disconnect it and store it in a cool, well oven, be sure to first disconnect the battery, ventilated place.

  • Page 5: Operation

    4. Operation Reheating Automatically Setting Cooking Times To reheat food, select the type of snack and the This oven is preset at the factory for automatic operation. microwave automatically sets the reheating time. 1. Once connected to the power supply the display on 1.

  • Page 6: Using The Start +30 S Button

    4. Operation (Continued) Error Codes Using the Start +30 s Button This is a ONE TOUCH COOK pad. Error Error Items Code Cause/Remedy By touching the pad once, you can start heating instantly Beep for 30 seconds. Low Batt. Voltage/ Voltage You can increase the cooking time by pressing the Start Check the...

  • Page 7: Disassembly And Reassembly

    5. Disassembly and Reassembly 5-1. 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: Replacement Of Fuse

    5. Disassembly and Reassembly (continued) 5-2. Reassembly 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 9: Alignment And Adjustments

    6. Alignment and Adjustments 6-1 Low Voltage Transformer 1. The low voltage transformer is located on the control circuit board. 2. Remove the low voltage transformer from the PCB Ass'y and check continuity. 3. Normal resistor reading is shown in the table. Resistance Terminals SLV-4300B...

  • Page 10: High Voltage Diode

    6. Alignment and Adjustments (continued) Diode 6-4. High Voltage 1. Isolate the diode from the Inverter-P.C.B by disconnecting its leads. 2. With the ohm-meter set at the highest resistance scale, measure across the diode terminals. Reverse the meter leads and read the resistance. A meter with 6V, 9V or higher voltage batteries should be used to check the front-to back resistance of the diode (otherwise an infinite resistance may be read in both directions).

  • Page 11: Troubleshooting

    Troubleshooting PRECAUTION 1. Check ground 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 lead wires from these parts and then check continuity without the power source on.

  • Page 12: Electrical Malfunction

    7. Troubleshooting (Continued) 7-2 Electrical Malfunction SYMPTOM CAUSE CORRECTIONS Oven is dead 1. Open or loose lead wire harness Check wire harness Main Fuse is OK. 2. Open thermal cutout switch Check magnetron or cavity thermal No display and no operation (magnetron, cavity) cutout switch is defective.

  • Page 13: Exploded Views And Parts List

    8. Exploded Views and Parts List 8-1 Exploded Views (Sub P.C.B) - 19 -...

  • Page 14: Main Parts List

    PP,BLK,-,-,3RD-W,- BASE PLEAT DE80-00008A BASE-PLATE SGCC1-Z,T0.8,-,-,DA7311,ACDC,- DE31-10154A MOTOR-SYNCHRONOUS M2HJ49ZR02,ST-16,50/60HZ,- DE71-60450B COVER-MGT PP,T2,W110.5,L109,-,28G,3RD-0.7 DE39-00282A WIRE HARNESS-DCN DE7711N/DE7712N,12/24V,30KHz DE94-00345C ASSY CONTROL-BOX TACT TYPE,DE7712N/DC-MWO,WHT S.N.A DE94-00260C ASSY DOOR DE7711,DE7712/XEG,PURE-WHT,ABS0370D DE71-00088A COVER-CONNECTOR POWER PP(5102FR0),T2.5,-,-,-,MD4300,ACDC DE97-00131A ASSY-POWER CONECTOR DA7311/MD4300,ACDC,0.7CUFT,-,-,- DE61-00093B BRACKET-RIGHT SECC ,T1.6,-,-,WHT,MD4300,- O-PANEL DE61-00094B BRACKET-LEFT SECC,T1.6,-,-,WHT,MD4300,-...

  • Page 15: Door Parts List

    ABS(HR0370D),-,WHT+GRN SPRAY,DE7711/12,- DE67-00069C BUTTON-START ABS(HR0370D),-,WHT+ORG SPRAY,DE7711/12,- DE67-00071A BUTTON-LED PERMITE ACRYL,-,D-GRY,DA7711,-,ACDC C-PANEL DE64-00135A WINDOW-DISPLAY SAN(CR5381G0126),SMOG,DA7711,- DE72-00098D CONTROL-PANEL ABS(HR0370D),DE7712N,T2.5,PURE-WHT,24V/EUROPE RC-DE7712N-00 ASSY PCB PARTS:DE7712N 8-5 Body Latch Parts List Code No. Description Specification Q'ty Remark DE66-40001A LATCH-BODY POM(F20-02),40GR,NTR,-,-,- 3405-000178 SWITCH-MICRO 250V,15A,200gf,SPST-NO 3405-000175 SWITCH-MICRO...
  • Page 16 8. Exploded Views and Parts List (Continued) 8-6 Power Connector Parts List Code No. Description Specification Q'ty Remark DE37-00001A CONNECTOR-POWER BSS T1.5+PBT,MD4300,-,-,-,-,-,-,-,- DE61-00084A BRACKET-CONNECTOR-A BSS,T1.5,-,-,YEL,DA7311,ACDC,- DE61-00085A BRACKET-CONNECTOR-B BSS,T1.5,-,-,YEL,DA7311,ACDC,- DE60-20063A BOLT-FLANGE M4,10,ZPC3,YEL,MSWR,-,-,-,- 8-7 Screw Parts List Code No. Description Specification Q'ty Remark 6006-001081 SCREW-ASS'Y TAPT...
  • Page 17 9. P.C.B Circuit Diagrams and Parts List 9-1. Main P.C.B Circuit Diagrams - 23-...
  • Page 18 TMP87PM14F,OTP-32K,QFP,8BIT-64PIN,-,-,-,- DE13-20014A IC-VOLT REGU KA7815,TO-220,-,-,-,-,- DE13-20016A IC-VOLT REGU KA7805A,TO-220AB,1A,0/125C,-,- DE26-00043A TRANS-L.V SLV-4300B,24V,57Hz,AC21V/0.2A,-,35*14,PIN,- LVT1 DE30-20016A BUZZER CBE2220BA,STICK,-,-,-,-,-,-,- BUZ1 DE92-00773A ASSY PCB AUTO 24V30KHZ,LED-DISPLAY,RC-DE7712N-00,-,- 0401-001083 DIODE-SWITCHING MM4148,100V,150MA,LL-34,TP D08~14 0402-001103 DIODE-RECTIFIER 1T4,400V,1A,TS-1,TP D01~07 0403-001288 DIODE-ZENER ZMM55C5V1,4.8-5.4V,500MW,LL-34,TP 0501-000465 TR-SMALL SIGNAL MMBT3904,NPN,350mW,SOT-23,TP,100-300 0504-001008 TR-DIGITAL RN2427,PNP,200MW,2.2K/10K,SOT-23,TP...
  • Page 19 9. P.C.B Circuit Diagrams and Parts List (Continued) 9-3. Inverter P.C.B Circuit Diagram - 25 -...
  • Page 20 9. P.C.B Circuit Diagrams and Parts List (Continued) 9-4. Drive P.C.B Circuit Diagram - 26 -...
  • Page 21 0402-001410 DIODE-RECTIFIER ESJC32-08XP,7.5KV,0.35A 0505-001552 FET-SILICON IRFP064N,55V,110A 2301-001483 C-FILM,MPEF 1.2NF,3KV 2301-001484 C-FILM,MPEF 3.6NF,3KV 3601-001220 FUSE 32VDC,80A,FAST-ACTING DE26-00065A TRANS-H.V SHV-DE7712N,24VDC DE61-00195A HOLDER-PCB DE7712N,PBT(VIB5050),WHT DE92-00785A ASSY PCB-DRIVE DE7712N,DC24V30KHz 9-5. Sub P.C.B Parts List Code No. Description Specification Q'ty Remark 3601-001094 FUSE-CARTRIDGE 250V,5A,FAST-ACTING DE47-40024A HOLDER-FUSE FH-51H,7.5A...

  • Page 22: Wiring Diagrams And Operating Sequence

    10. Wiring Diagrams and Operating Sequence 10-1. Wiring Diagram - 28 -...

  • Page 23: Description Of Operating Sequence

    10. Wiring Diagrams and Operating Sequence (continued) 10-2. Description of Operating Sequence When oven is started, initial operating status is shown below figure. Test point WAVE FORM in circuit diagram Fan relay Lamp relay Power relay ƒ= 250Hz PWM output ƒ=27KHz Out 1 ƒ=27KHz...

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