Samsung MR5481G Service Manual Download Page 24

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9. Schematic Diagrams

9-1 Schematic Diagrams

9-1

VARISTOR

L.V.TRANS

LAMP

MAIN RELAY

POWER RELAY

(SECONDARY INTERLOCK)

PRIMARY S/W

CAVITY

TCO

FAN

MOTOR

D/MOTOR

MONITOR
SWITCH

H. V. TRANS

H. V. CAPACITOR

H. V. DIODE

MAGNETRON

POWER CORD
AC 120V/60Hz

(N)

(L)

BLK

BLU

BLK

YEL

WHT

1. INPUT : 120V 60HZ
2. DOOR : OPEN
3. LAMP : ON
4. : P.C.B PATTERN
5. : P.C.B IN/OUT POINT

WHT : WHITE
BLK : BLACK
YEL : YELLOW
BLU : BLUE
ORG : ORANGE
G : GREEN

MGT
TCO

COM

120V

130V
40W

21V

ASSY CHOKE P.C.B

FUSE

WHT

GND

0.9mH

500K

2200pF

BLK BLK

BLK

WHT

BLK BLU

ORG

COM

ORG

COM

WHT

COM

DOOR
SENSING
SWITCH

INTERLOCK
MONITOR
SWITCH

PRIMARY
INTERLOCK
SWITCH

(CON1)

RED

ORG

WHT

BLK

MAGNETRON

HIGH VOLTAGE
DIODE

TO CHASSIS

HIGH VOLTAGE
TRANSFORMER

HIGH VOLTAGE CAPACITOR

BLK

RED

ORG

WHT

SYMBOL

COLOR

BLU

BLK

RED

ORANGE

WHITE

BLUE

BLACK

Samsung Electronics

Summary of Contents for MR5481G

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: ...ng parts Primary and secondary interlock switches interlock monitor switch 12 If the 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 b...

Page 3: ...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 4: ...L POWER IEC 705 TEST PROCEDURE IEC 705 TEST PROCEDURE OPERATING FREQUENCY 2 450MHz 2 450MHz MAGNETRON OM75PH 31 ESS OM75P B1 ESS COOLING METHOD COOLING FAN MOTOR COOLING FAN MOTOR OUTSIDE DIMENSIONS 2011 32 W x 1111 32 H x 145 8 D 2129 32 W x 1211 32 H x 1629 32 D NET WEIGHT 33 1 lbs 40 8 lbs SHIPPING WEIGHT 37 5 lbs 46 3 lbs 2 2 Comparison Chart MODEL MR5481G MR5482W MR6481G MR6482W FEATURE MORE ...

Page 5: ...rnal Views Door VentilationSlot Light SafetyInterlockHoles ControlPanel OpenDoorPush Button GuideRoller GlassPlate DoorLatches 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 MR5481G MR5482W 517mm MR6481G MR6482W 556mm MR5481G MR5482W 369mm MR6481G MW...

Page 6: ...om the back panel 6 Take out the fan motor 7 Remove the oven lamp by pulling out from hole of air cover 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 voltage capacito...

Page 7: ... 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 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 Reassembly Upper Hinge Lower Hinge Scre...

Page 8: ...ive motor and the coupler 8 When replacing the drive motor be sure to remount it in the correct position with the coupler 9 Connect all the leads to the drive motor 10 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 A...

Page 9: ...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 10: ...se 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 touc...

Page 11: ...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 switches again by following the componen...

Page 12: ...ture rise is marginal NOTE 2 Output power in watts is computed by multiplying the temperature rise step 5 by a factor of 80 90 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 Alignme...

Page 13: ...ate 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 pa...

Page 14: ...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 15: ...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 16: ...iews and Parts List 7 1 Exploded Views 7 1 M1 M2 M29 I 4 M21 M22 M23 C1 C2 C3 C4 C5 C6 M24 D1 D2 D3 D5 D6 M25 M26 M11 M13 M14 M15 M12 M16 M17 M18 M19 I 3 M32 M20 M3 M4 M5 M6 M7 M8 M9 M10 B1 B2 B4 B3 I 1 M27 D4 D8 D7 M28 M31 M30 I 2 C7 ...

Page 17: ...T0 8 W31 L125 8 1 M 15 DE91 70063A ASSY H V D V2M6 PI9 0 0 05MT 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 40065A FOOT PP BLK T2x22x17mm 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 WH...

Page 18: ...R5482W Ref No Parts No Description Specification Q ty Remarks C 1 DE66 20010B BUTTON PUSH ABS D GRY MW4371G 1 MR5481G C 1 DE66 20010A BUTTON PUSH ABS VH 080 WHT 17 6G MW4370W 1 MR5482W C 2 DE61 70076A SPRING BUTTON HSWR PI0 6 1 C 3 DE34 10217S SWITCH MEMBRANE PET 120V 0 5A 174 5x91 5 1 MR5481G C 3 DE34 10217V SWITCH MEMBRANE PET 120V60HZ W91 5xL174 5 1 MR5482W C 4 DE72 70161B CONTROL PANEL ABS HR0...

Page 19: ... HVC SECC T0 8 W31 L125 8 1 M 15 DE91 70063A ASSY H V D V2M6 PI9 0 0 05MT 1 M 16 DE74 20002A TRAY COOKING GLASS T6 PI360 1 2CUFT NEG 1 M 17 DE92 90189B ASSY GUIDE ROLLER D16 5 STD 1 M 18 DE67 60002A COUPLER PPS 5GR BRN M97G45 M 19 DE61 40065A FOOT PP BLK T2x22x17mm 2 M 20 DE80 10002C BASE PLATE SGCC T0 8 L404 L633 MR6481G 1 M 21 DE31 10154A MOTOR DRIVE M2HJ49ZR02 ST 16 21V 5 6 1 M 22 DE71 60164F C...

Page 20: ...l Parts List MR6481G MR6482W Ref No Parts No Description Specification Q ty Remarks C 1 DE66 20010B BUTTON PUSH ABS D GRY MW4371G 1 MR6481G C 1 DE66 20010A BUTTON PUSH ABS VH080 WHT 17 6G MW4370W 1 MR6482W C 2 DE61 70076A SPRING BUTTON HSWR PI0 6 1 C 3 DE34 10217N SWITCH MEMBRANE PET 125V 91X190 MR6481G 1 MR6481G C 3 DE34 10217M SWITCH MEMBRANE PET 125V 91X190 MR6482W 1 MR6482W C 4 DE72 70162B CON...

Page 21: ...AR DE60 10113A SCREW TAP PH 2S 4X12 FE ZPC3 1 FUSE H DE60 10188A SCREW ASSY TAP 2S 4X8 MSW3ZPC YEL WS Q1 B HVC 7 4 Samsung Electronics 7 6 Standard Parts List MR5481G MR5482W MR6481G MR6482W Exploded Views and Parts List 7 7 Installation Parts List MR5481G MR5482W MR6481G MR6482W Ref No Parts No Description Specification Q ty Remarks I 1 DE64 90154A TRIMMER UPPER SECC T0 8 W53 1 L532 2 1 MR5481G I...

Page 22: ...8 P C B Diagrams 8 1 P C B Diagrams Samsung Electronics 8 1 ...

Page 23: ...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 24: ... P C B PATTERN 5 P C B IN OUT POINT WHT WHITE BLK BLACK YEL YELLOW BLU BLUE ORG ORANGE G GREEN MGT TCO 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 ORG NO COM ORG NO COM WHT NC COM DOOR SENSING SWITCH INTERLOCK MONITOR SWITCH PRIMARY INTERLOCK SWITCH CON1 RED RED RED ORG WHT BLK MAGNETRON HIGH VOLTAGE ...

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