Samsung M745 Service Manual Download Page 1

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MICROWAVE OVEN

M745

SERVICE

Manual

MICROWAVE OVEN

CONTENTS

M745

Auto

10s.

10min

min

1min

0.1 kg

1min+

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

TAWIL

Summary of Contents for M745

Page 1: ...NTENTS M745 Auto 10s h 10min min 1min 0 1 kg 1min 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 TAWIL ...

Page 2: ...ELECTRONICS Samsung Electronics Co Ltd December 1997 Printed in Korea DE68 62332A ...

Page 3: ...g of hinges and latches 5 evidence of dropping or abuse c Before turning on microwave power for any service test 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...

Page 4: ...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 5: ...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 6: ...G METHOD COOLING FAN MOTOR OUTSIDE DIMENSIONS 489 W x 275 H x 356 D POWER LEVEL M745 10 80W 4 sec 26 sec 20 160W 7 sec 23 sec 30 240W 10 sec 20 sec 40 320W 13 sec 17 sec 50 400W 16 sec 14 sec 60 480W 19 sec 11 sec 70 560W 22 sec 8 sec 80 640W 25 sec 5 sec 90 720W 28 sec 2 sec 100 800W 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 7: ...n Weight EnteringButton Instant Cook Button 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 M745 Auto 10s h 10min min 1min 0 1 kg 1min 489mm 357mm 275mm 200mm 356mm M745 Auto 10s h 10min min 1min 0 1 kg 1min ...

Page 8: ...ron 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 good c...

Page 9: ...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 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...

Page 10: ...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 11: ...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 12: ...rminal 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 the hig...

Page 13: ...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 14: ...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 15: ...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 4 mW ß 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...

Page 16: ...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 17: ...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 18: ...loded Views and Parts List 7 1 Exploded Views 7 1 M1 M4 M3 M5 M9 M8 M11 M20 M21 M23 M25 M26 M18 M17 M16 M27 M28 M29 M33 M34 M32 D1 M30 M6 M7 M10 M2 M12 M13 M15 M12 M14 M22 M24 M19 M 31 C1 C2 C3 C4 C5 C6 D5 D6 D4 D7 D8 D2 D3 C7 ...

Page 19: ... O M F20 02 2 6 NTR 2ND W 1 M 15 DE66 40001A LATCH BODY 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 D16 5 MW4370W 1 M 18 DE67 60002A COUPLER PPS 5GR BRN M97G45 1 M 20 2501 001036 C OIL 950uF 2100V BK 35x54x85 20mm 1 M 21 DE61 50106A BRACKET HVC SECC T0 8 W31 L125 8 1 M 22 DE59 40001A DIODE H V HVR 1X 32B 12 1 M 23 DE91 70061B ...

Page 20: ...t 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 TAPTITE...

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

Page 22: ...UF 20 35V GP 10X1 1 C01 2802 000143 RESONATOR CERAMIC KBR 4 19M 4 19MHZ 0 5 BK 1 XTL1 3501 001014 RELAY POWER OM1F S 124LM 24V 21 8MA 17A 1 RY01 3501 001016 RELAY MINIATURE JV24 KT 24V 12 5MA 5A 1F 2 RY02 03 3708 000523 CONNECTOR FPC FC PIC FCZ254 08SL BLK 8P 1 CN04 3711 000203 CONNECTOR HEADER 1WALL 3P 1R 3 96mm STRA 1 CN01 3711 000881 CONNECTOR HEADER SMW250 03 WHT BOX 3P 1R 1 CN03 A1000 0620 R ...

Page 23: ...Y MAIN RELAY F FA MAGNETRON NO COM NO NC 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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