Samsung M643 Service Manual Download

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9. Schematic Diagrams

9-1 Schematic Diagrams

9-1

230V~
50Hz

VOLTAGE
FREG

BRN

BLK

BLU

BLK

YEL

ORG

BLU

21V

230V

WHT

BLU

500K

2200pF

LIN-CAPACITORT 0.1uF

ASSY NOISE FILTER

MGT

TCO

CAVITY

TCO

MONITOR

FUSE

PRIMARY

SWITCH

INRUSH RELAY

MONITOR

SWITCH

L.V.T

MAIN

RELAY

POWER

RELAY

INRUSH

RELAY

DOOR

SENSING

SWITCH

DOOR

SENSING

SWITCH

RESISTOR

POWER RELAY

MAIN

RELAY

MAGNETRON

COM

BLU YEL

BRN

BRN BLK

BLU BLK

COM

LAMP

(230V40W)

L.V.TRANS

PRIMARY
LATCH
SWITCH

COM

ORG

MONITOR
SWITCH

H.V.T

H.V.D

H.V.C

H.V.FUSE

1mH

BRN

BROWN

BLU

BLUE

ORG

ORANGE

RED

WHT

WHITE

BLK

BLACK

YEL

YELLOW

GRN

GREEN

Y/G

YELLOW/GREEN

SYMBOL

COLOR

NOTE

MAIN FUSE

1. INPUT : 230V
2. DOOR : OPEN
3. LAMP : ON
4. : P.C.B PATTERN
5. : P.C.B IN/OUT

POINT

ASSY MAIN P.C.B

Samsung Electronics

RED

BRN

BLU

HIGH VOLTAGE
TRANSFORMER

H.V.FUSE

HIGH VOLTAGE CAPACITOR

HIGH VOLTAGE
DIODE

TO CHASSIS

MAGNETRON

SYMBOL COLOR
ORG ORANGE
BRN BROWN
RED RED
BLU BLUE

RED

Summary of Contents for M643

Page 1: ...anual 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 NSI ...

Page 2: ...k 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 being repaired 13 Design Alteration Warn...

Page 3: ...es 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 to the oven chassis Use a screwdrive...

Page 4: ...G METHOD COOLING FAN MOTOR OUTSIDE DIMENSIONS 489 W x 275 H x 351 D POWER LEVEL M643 10 75W 4 sec 26 sec 20 150W 7 sec 23 sec 30 225W 10 sec 20 sec 40 300W 13 sec 17 sec 50 375W 16 sec 14 sec 60 450W 19 sec 11 sec 70 525W 22 sec 8 sec 80 600W 25 sec 5 sec 90 675W 28 sec 2 sec 100 750W 30 sec 0 sec ON TIME OFF TIME 2 2 Comparison Chart MODEL FEATURE MORE LESS AUTO COOK DISH AUTO DEFROST O TIME COOK...

Page 5: ...wer Level Selection Button Auto 0 1 kg 1min 3 Operating Instructions 3 1 Control Panel Samsung Electronics 3 1 3 2 Features External Views Door VentilationSlot Light SafetyInterlockHoles ControlPanel OpenDoorPushButton GuideRoller GlassPlate DoorLatches 10min 1min h 10s min M643 Auto 0 1 kg 1min 489mm 357mm 275mm 200mm 351mm 10min 1min h 10s min M643 Auto 0 1 kg 1min ...

Page 6: ...gnetron very carefully 7 Remove screws from the back panel 8 Take out the fan motor 9 Remove the oven lamp by rotating to pull 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 go...

Page 7: ...ndling 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 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...

Page 8: ...hen replacing the drive motor be sure to remount it in the correct position 8 Connect all the leads to the drive motor 9 Screw the deive motor cover to the base plate with a screw driver 10 Remount the coupler in the correct position 4 4 Replacement of Fuse 4 5 Replacement of Drive Motor Disassembly and Reassembly Screw Drive Motor Cover Base Plate Drive Motor After replacement of the defective co...

Page 9: ...onnecting 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 usi...

Page 10: ...nt terminal and 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 th...

Page 11: ...just 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 switches again by fo...

Page 12: ...nal power test should be made if temperature rise is marginal NOTE 2 Output power in watts is computed by multiplying the temperature rise step E by a factor of 91 times the of centigrade temperature The microwave heat distribution can be checked indirectly by measuring the water temperature rise at certain positions in the oven 1 Prepare five beakers made of Pyrex having 100 milliliters capacity ...

Page 13: ...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 4 mW 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 CENTRAL SERVICE CENTER 5 13 2 At least once a year have the microwave energy survey meter chec...

Page 14: ...witch 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 Sequence R...

Page 15: ...noise can be heard 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 Replace turntable motor 2 Defective turntable motor Oven stops operation during cooking 1 Open or loose wiring of primary Adjust door and latch swi...

Page 16: ...Exploded Views and Parts List 7 1 Exploded Views 7 1 M 1 M4 M3 M5 M9 M8 M11 M20 M21 M23 M25 M26 M18 M17 M16 M27 M28 M29 M32 D1 M30 M6 M7 M10 M2 M12 M13 M15 M12 M14 M22 M24 M19 M31 C1 C2 C3 C4 C5 C6 D5 D6 D4 D7 D8 D2 D9 D3 C7 ...

Page 17: ...DY POM F20 02 40GR NTR 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 DE27 10020A COIL MC CHOKE TC 101 1 M 20 2501 001036 C OIL 950nF 2100V BK 35x54x85 20mm 1 M 21 DE61 50106A BRACKET HVC SECC T0 8 W31 L125 8 1 M 22 DE91 70063A ASSY HVD V2M6 PI9 0 0 05MT 1 M 23 DE91 70061B ASSY H V FUSE TH...

Page 18: ...List 7 4 Control Parts List 7 3 Door Parts List Parts No Description Specification Q ty Remarks DE60 10098A SCREW ASSY TAPTITE PH TC M4X8 SWRCH18A Z 2 MO DRI DE60 10088A SCREW TAP PH PH M3 L8 FEFZY PLAIN 2 PCB DE60 10098A SCREW ASSY TAPTITE PH TC M4X8 SWRCH18A Z 1 HVD DE60 10082H SCREW A 2S 4X12 TOOTHED 2 CON BX DE60 10012A SCREW TAP TITE TH 3 M4 L10 SWR10 ZPC2 1 MEM PN DE60 10098A SCREW ASSY TAPT...

Page 19: ...8 P C B Diagrams 8 1 P C B Diagrams Samsung Electronics 8 1 ...

Page 20: ...0273 R CARBON 100Kohm 5 1 8W AA TP 1 8x3 2m 1 R19 2001 000290 R CARBON 10Kohm 5 1 8W AA TP 1 8x3 2mm 11 R07 R11 R14 R16 R17 R23 R25 2001 000429 R CARBON 1Kohm 5 1 8W AA TP 1 8x3 2mm 6 R04 R05 R06 R12 R15 R22 2001 000446 R CARBON 2 2Kohm 5 1 2W AA TP 3 3x9mm 2 R03R33 2001 000613 R CARBON 3 9Kohm 5 1 8W AA TP 1 8x3 2m 3 R13R18R20 2001 000841 R CARBON 51ohm 5 1 4W AA TP 2 4x6 4mm 7 R26 R32 2001 00090...

Page 21: ...Y MAIN RELAY F FA MAGNETRON NO COM NO NO BLU YEL BRN BRN BRN BLK BLU BLK COM 0V LAMP 230V40W L V TRANS PRIMARY LATCH SWITCH NO COM ORG ORG MONITOR SWITCH L FM H V T H V D H V C H V FUSE 1mH BRN BROWN BLU BLUE ORG ORANGE RED RED WHT WHITE BLK BLACK YEL YELLOW GRN GREEN Y G YELLOW GREEN SYMBOL COLOR NOTE MAIN FUSE DM 1 INPUT 230V 2 DOOR OPEN 3 LAMP ON 4 P C B PATTERN 5 P C B IN OUT POINT ASSY MAIN P...

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