Samsung MR4381G Service Manual Download Page 1

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MICROWAVE OVEN

MR4381G

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

SEA

One
Minute
+

Popcorn

Frozen
Dinner

Power
Level

Auto Start

Hold
Timer

More
Less

Auto
Defrost

Auto
Reheat

Clock

Pause
Cancel

Start

Summary of Contents for MR4381G

Page 1: ...nstructions 4 Disassembly and Reassembly 5 Alignment and Adjustments 6 Troubleshooting 7 Exploded Views and Parts List 8 PCB Diagrams 9 Schematic Diagrams SEA One Minute Popcorn Frozen Dinner Power Level Auto Start Hold Timer More Less 1 2 3 4 5 6 7 8 9 0 Auto Defrost Auto Reheat Clock Pause Cancel Start ...

Page 2: ...RIDGEFIELD PARK N J 07660 0511 10 Service technicians should remove their watches while repairing an MWO 11 To avoid any possible radiation hazard replace parts in accordance with the wiring diagram Also use only the exact replacements for the following parts Primary and secondary interlock switches interlock monitor switch 12 If the fuse is blown by the Interlock Monitor Switch Replace all of the...

Page 3: ...ges this includes the filament voltage of the magnetron High voltage is present during any cook cycle Before touching any components or wiring always unplug the oven and discharge the high voltage capacitor See Figure 1 1 2 The high voltage capacitor remains charged about 30 seconds after disconnection Short the negative terminal of the high voltage capacitor to the oven chassis Use a screwdriver ...

Page 4: ...ROM70 TO 700W 10 LEVEL POWER IEC 705 TEST PROCEDURE OPERATING FREQUENCY 2 450MHz MAGNETRON OM75SH 31 COOLING METHOD COOLING FAN MOTOR OUTSIDE DIMENSIONS 191 4 W x 115 8 H x 139 16 D NET WEIGHT 30 LBS SHIPPING WEIGHT 33 LBS 2 2 Comparison Chart MODEL FEATURE MORE LESS O AUTO REHEAT O AUTO DEFROST O TIME COOK O POWER LEVEL O INSTANT COOK O MEMORY BOOST CHILD LOCK O CLOCK O GRILL COMBI MR4381G ...

Page 5: ...utton 3 Operating Instructions 3 1 Control Panel Samsung Electronics 3 1 3 2 Features External Views Door DuctAir VentilationHoles Light SafetyInterlockHoles ControlPanel OpenDoorPush Button GuideRoller GlassPlate DoorLatches One Minute Popcorn Frozen Dinner Power Level Auto Start Hold Timer More Less 1 2 3 4 5 6 7 8 9 0 Auto Defrost Auto Reheat Clock Pause Cancel Start 489mm 357mm 295mm 200mm 344...

Page 6: ...ONAL VEHICLE ONLY MAY BE BUILT INTO A CABINET STRUCTURE BUT NOT FOR USE ADJACENT TO WITHIN 2 FEET OF ANY GAS OR ELECTRIC RANGE COOKTOP OR OVEN PLUG THE THREE PRONG POWER CORD INTO A PROPERLY GROUNDED OUTLET 120V 60Hz SCREW Trim to outcase SCREW Trim to outcase SCREW Trim to cabinet Fig 1 Fig 2 DEPTH 13 1 4 WIDTH 19 3 8 HEIGTH 11 7 8 ...

Page 7: ...s from the back panel 7 Take out the fan motor 8 Remove the oven lamp by pulling out from hole of air cover carefully NOTE1 When removing the magnetron make sure that its antenna does not hit any adjacent parts or it may be damaged NOTE2 When replacing the magnetron be sure to remount the magnetron gasket in the correct position and make sure the gasket is in good condition 1 Discharge the high vo...

Page 8: ... C because it is fragile Following the procedure as shown in the figure insert and bend a thin metal plate between Door E and Door A until you hear the tick sound 1 Insertion depth of the thin metal plate should be 0 5mm or less 4 3 4 Removal of Key Door Spring Remove pin hinge from Door E Detach spring from Door E and key door 4 3 2 Removal of Door C 4 3 3 Removal of Door E Disassembly and Reasse...

Page 9: ...ing the drive motor be sure to remount it in the correct position with the coupler 8 Connect all the leads to the drive motor 9 Screw the drive motor cover to the base plate with a screw driver 4 4 Replacement of Fuse 4 5 Replacement of Drive Motor Disassembly and Reassembly Screw Drive Motor Cover Base Plate Thermo Switch Drive Motor 4 3 5 Reassembly Test After replacement of the defective compon...

Page 10: ...cting the FPC connector make sure that the holes on the connector are properly engaged with the hooks on the Plastic Fastener 1 Window display should not be disassembled as its mounting tabs will be broken If repair work is difficult replace with Ass y control panel 2 The membrane key board is attached to the escutcheon base with doublefaced adhesive tape Therefore applying hot air such as using o...

Page 11: ...nd magnetron case should read open 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 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 voltag...

Page 12: ...oven assembly adjust the Latch Body by moving it so that the oven door will not have any play in it Check for play in the door by pulling the door assembly Make sure that the latch keys move smoothly after adjustment is completed Completely tighten the screws holding the Latch Body to the oven assembly 4 Reconnect to Monitor switch and check the continuity of the monitor circuit and all latch swit...

Page 13: ...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 NOTE Check line voltage under load Low voltage will lower the magnetron output Mak...

Page 14: ...easurement 1 After adjustment and repair of a radiarion preventing device make a repair record for the measured values and keep the data 2 If the radiation leakage is more than 5 mW cm2 after determining that all parts are in good condition functioning properly and the identical parts are replaced as listed in this manual notift that fact to Samsung Electronics America inc Headquarter office 105 c...

Page 15: ...ng switch 3 Defective monitor switch NOTE1 4 Shorted HVCapacitor 5 Shorted HVTransformer NOTE2 NOTE 1 All of these switches must be replaced at the same time refer to adjustment instructions Check continuity of power relay contacts and if it has continuity replace power relay also NOTE 2 When HVTransformer is replaced check diode and magnetron also Oven does not accept 1 Key input is not in Sequen...

Page 16: ...d 1 Loose fan and fan motor Tighten screws of fan motor 2 Loose screws on H V Transformer Tighten screws of H V Transformer 3 Shorted H V Diode Replace H V Diode Turntable motor does not rotate 1 Open or loose wiring of turntable motor Check the wire of turntable motor 2 Defective turntable motor Replace turntable motor Oven stops operation during cooking 1 Open or loose wiring of primary Adjust d...

Page 17: ... Exploded Views and Parts List 7 1 Exploded Views 7 1 M1 M2 M21 M22 M23 C1 C2 C3 C4 C5 C6 C7 M24 D1 D2 D3 D5 D6 M25 M26 M11 M13 M14 M15 M12 M16 M17 M18 M19 M20 M28 M3 M4 M5 M6 M7 M8 M9 M10 B1 B2 B4 B3 D4 D7 M27 I 3 I 1 I 2 ...

Page 18: ...NS H V SHV 4370UC1 120V 60HZ DPC 2080V 1 M 13 2501 001018 C OIL 800nF 2100V 35X54X70 20mm BK 1 M 14 DE61 50106A BRACKET HVC SECC T0 8 W31 L125 8 1 M 15 DE59 40001A DIODE H V HVR 1X 32B 12 1 M 16 DE74 20102B TRAY COOKING GLASS T5 0 PI288 780G M745 1 M 17 DE92 90436A ASSY GUIDE ROLLER MW4370W 1 M 18 DE67 60002A COUPLER PPS 5GR BRN M97G45 1 M 19 DE61 40017A FOOT PP A353 BLK MW5630T 2 M 20 DE80 10117A...

Page 19: ...02T SWITCH MEMBRANE PET MR4381G XAA SEA 1 C 4 DE72 70009B CONTROL PANEL ABS VH 0853 173 5G GRY MW437 1 C 5 DE67 40003A WINDOW DISPLAY ACRYL T2 3 W36 8 L91 8 SM 1 C 6 DE91 10368A ASSY P C B MAIN 120V 60HZ NS V F D N HEL 1 C 7 DE93 30384B ASSY CONTROL PANEL N DESIGN D GRY MW4371G 1 7 5 Body Latch Parts List 7 6 Installation Parts List Ref No Parts No Description Specification Q ty Remarks B 1 DE66 4...

Page 20: ... M3 L6 FEFZY 2 MGT TC DE60 10053A SCREW TAP PH PH M4 L10 FEFZY 1 FUSE H DE60 10053A SCREW TAP PH PH M4 L10 FEFZY 2 M GEAR DE60 10066A SCREW TAP TH TH M4 L8 FEFZY 2 SLOT 1 B HVC DE60 10082H SCREW A 2S 4X12 TOOTHED 1 P CO E DE60 10082H SCREW A 2S 4X12 TOOTHED 2 CV BLW DE60 10082H SCREW A 2S 4X12 TOOTHED 1 B DR M DE60 10088A SCREW TAP PH PH M3 L8 FEFZY PLAIN 2 P C B DE60 10082A SCREW A M4 L12 2S TOOT...

Page 21: ...8 P C B Diagrams 8 1 P C B Diagrams Samsung Electronics 8 1 ...

Page 22: ...P 1 CON05 3711 000881 CONNECTOR HEADER SMW250 03 WHT BOX 3P 1R 1 CON04 A1000 0218 R CARBON RD 1 8 T 221 J 1 R09 A1000 0220 R CARBON RD 1 8 T 621 J 1 R08 A1000 0225 R CARBON RD 1 8 T 392 J 8 R16 18 20 26 30 A1000 0228 R CARBON RD 1 8 T 103 J 5 R07 10 14 15 19 A1000 0241 R CARBON RD 1 8 T 202 J 1 R13 A1000 0327 R CARBON RD 1 8 T 471 J 1 R01 A1000 0327 R CARBON RD 1 8 T 471 J 1 R02 A1000 0433 R CARBO...

Page 23: ... B PATTERN 5 P C B IN OUT POINT WHT WHITE BLK BLACK YEL YELLOW BLU BLUE ORG ORANGE G GREEN MGT TCO COM COM NC 120V 120V 130V 40W 21V 0V NO L FM DM ASSY CHOKE P C B FUSE WHT G G GND GND C 1 C 3 C2 0 9mH 500K 2200pF 2200pF BLK BLK BLK WHT BLK BLU BLK ORG NO COM ORG NO NO COM NC COM DOOR SENSING SWITCH INTERLOCK MONITOR SWITCH PRIMARY INTERLOCK SWITCH CON1 RED RED RED ORG WHT BLK MAGNETRON HIGH VOLTA...

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