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MICROWAVE OVEN

MW5480W / MW5481G

MW5380W / MW5381G

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

Auto

Defrost

Auto

Reheat

Pause
Cancel

Start

Clock

Auto Start

Hold

Timer

One

Popcorn

Diet Cook

Potato

Frozen

Dinner

Fresh

Vegetable

Frozen

Breakfast

More/Less

Power Level

Summary of Contents for MW5380W

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

Page 2: ... or inspection within the microwave generating compartments check the magnetron wave guide or transmission line and cavity for proper alignment integrity and connections d Any defective or misadjusted components in the interlock monitor door seal and microwave generation and transmission systems shall be repaired replaced or adjusted by procedures described in this manual before the oven is releas...

Page 3: ...fuse is blown by the Interlock Monitor Switch Replace all of the following at the same time Primary and secondary switches as well as the Interlock Monitor Switch The correct adjustment of these switches is described elsewhere in this manual Make sure that the fuse has the correct rating for the particular model being repaired 12 Design Alteration Warning Use exact replacement parts only i e only ...

Page 4: ...ages 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 5: ...TO 900W 10 LEVEL POWER IEC 705 TEST PROCEDURE OPERATING FREQUENCY 2 450MHz MAGNETRON OM75PH 31 ESS COOLING METHOD COOLING FAN MOTOR OUTSIDE DIMENSIONS 2011 32 W x 1111 32 H x 145 8 D NET WEIGHT 33 1 lbs SHIPPING WEIGHT 37 5 lbs 2 2 Comparison Chart MODEL MW5480W MW5481G MW5380W MW5381G FEATURE MORE LESS Ο AUTO REHEAT Ο AUTO DEFROST Ο TIME COOK Ο POWER LEVEL Ο INSTANT COOK Ο MEMORY Ο BOOST CHILD LO...

Page 6: ... Button 8 Start Button 9 Instant Cook Button 10 Auto Reheat Button 11 Number Key Button MW5480W MW5481G MW5380W MW5381G 3 Operating Instructions 3 1 Control Panel Samsung Electronics 3 1 3 2 Features External Views Door VentilationSlot Light SafetyInterlockHoles ControlPanel OpenDoorPush Button GuideRoller GlassPlate DoorLatches Auto Defrost Auto Reheat Pause Cancel Start Clock Auto Start Hold Tim...

Page 7: ...rom the back panel 6 Take out the fan motor 7 Remove the oven lamp by pulling out from hole of air cover 8 NOTE1 When removing the magnetron make sure that its antenna does not hit any adjacent parts or it may be damaged 9 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 voltage cap...

Page 8: ...or A and Door C to remove Door C Be careful when handling Door 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 2 Removal of Door C 4 3 3 Removal of Door E Disassembly and Reassembly Upper Hinge Lower Hinge Screw Scre...

Page 9: ... 3 When replacing the 15A fuse be sure to use an exact replacement part If new 15A fuse blows out again after replacement check the primary interlock switch door sensing switch and interlock monitor switch 4 When the above three switches operate properly check if any other part such as the control circuit board blower motor or high voltage transformer is defective 1 Take out the glass tray and the...

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: ...ase 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 voltage 3 Before tou...

Page 12: ...n 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 switche...

Page 13: ...ature rise is marginal NOTE 2 Output power in watts is computed by multiplying the temperature rise step 5 by a factor of 80 times the of centigrade temperature 4 187 x 1000 x T 0 88xMcx T2 T0 Output Power 46 5 46 5 Heating Time sec 4 187 Coefficient for Water 1000 Water cc T Temperature Rise T2 T1 Mc Cylindrical borosilicate glass weight To Room temperature 5 8 Output Power of Magnetron Alignment...

Page 14: ... rate of 1 inch sec If the leakage testing of the cabinet door seam is taken near a corner of the door keep the probe perpendicular to the areas making sure that the probe end at the base of the cone does not get closer than 2 inches to any metal If it gets closer than 2 inches erroneous readings may result 5 Measured leakage must be less than 5mW cm2 after repair or adjustment 1 Remove the outer ...

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: ...7 Exploded Views and Parts List 7 1 Exploded Views 7 1 1 M2 M29 M21 M22 M23 M24 D1 D2 D3 D5 D6 M25 M26 M11 M13 M14 M15 M12 M16 M17 M18 M19 M20 M3 M4 M5 M6 M7 M8 M9 M10 B1 B2 B4 B3 M27 D4 D7 M28 M31 M30 C1 C2 C3 C4 C5 C6 C7 ...

Page 18: ... T0 8 W31 L125 8 1 M 15 DE59 40001A DIODE H V HVR 1X 32B 12 1 M 16 DE74 20015B TRAY COOKING GLASS T6 0 PI318 1050G MW56 1 M 17 DE92 90189D ASSY GUIDE ROLLER D19 STD 1 M 18 DE67 60026C COUPLER PTFE 12G WHT MB245 1 M 19 DE61 40017A FOOT PP A353 BLK MW5630T 2 M 20 DE80 10001A BASE PLATE SGCC T0 8 345 565 1 M 21 DE31 10154A MOTOR DRIVE M2HJ49ZR02 ST 16 21V 5 6 1 M 22 DE71 60011A COVER MGT PP T2 0 WHT ...

Page 19: ...USH ABS D GRY MW4371G 1 MW5481G MW5381G C 2 DE61 70076A SPRING BUTTON HSWR PI0 6 1 C 3 DE34 10217P SWITCH MEMBRANE PET 120V60HZ MW5480W 91 5 1 MW5480W C 3 DE34 10217R SWITCH MEMBRANE PET 120V 0 5A 174 5X91 5 MW5 1 MW5380W C 3 DE34 10217C SWITCH MEMBRANE PET 120V60HZ MW5471G 91 5 1 MW5481G C 3 DE34 10217D SWITCH MEMBRANE PET 120V60HZ MW5371G 91 5 1 MW5381G C 4 DE72 70161A CONTROL PANEL ABS HR0370U ...

Page 20: ... SCREW WASHER M5 L12 2S 4 MGT DE60 10033A SCREW TH TH M4 L10 MSWR10 FEFZY 2 HI LOW DE60 10082A SCREW A M4 L12 2S TOOTHED 2 C BLOW DE60 10033A SCREW TH TH M4 L10 MSWR10 FEFZY 2 HI UPP DE60 10045A SCREW TAP PH PH M3 L6 FEFZY 2 MGT TC DE60 10082A SCREW A M4 L12 2S TOOTHED 1 MEM PN DE60 10098A SCREW ASSY TAPTITE PH TC M4X8 SWRCH18A Z 1 CV TCO DE60 10098A SCREW ASSY TAPTITE PH TC M4X8 SWRCH18A Z 2 M GE...

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

Page 22: ...W A SIP 9P TP 1 AR01 2202 000121 C CERAMIC MLC AXIAL UP050B101KBB 100PF 1 1 C09 2202 000127 C CERAMIC MLC AXIAL TP050F103ZB 10NF 80 1 C10 2202 000780 C CERAMIC MLC AXIAL UP050F104Z 100NF 80 4 C05 07 11 2401 000247 C AL 1SA1ANB107MAN 100UF 20 10V GP 6 3X 1 C14 2401 000466 C AL CESSM1V100M0507 10UF 20 35V GP 5X7 1 C08 2401 000914 C AL CESSL1C220M0511AA 22UF 20 16V GP 5 1 C03 2401 001412 C AL 1SG1VFB...

Page 23: ...N WITH DOOR IS OPENED POSITION NOTE FOR SERVICE REPLACEMENT USE 16 GA 105 C THERMOPLASTIC COVERED WIRE EXCEPT FOR HIGH VOLTAGE LEADS OR AS NOTED ON SPECIAL LEADS 1 INPUT 120V 60HZ 2 DOOR OPEN 3 LAMP ON 4 P C B PATTERN 5 P C B IN OUT POINT MGT TCO COM NC 120V 130V 40W 21V 0V NO L FM DM BLK BLK RED RED RED ORG WHT BLK WHT ORG ORG WHT BLK BLK MAGNETRON HIGH VOLTAGE DIODE TO CHASSIS FA F HIGH VOLTAGE ...

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