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Samsung M745 Service Manual
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Samsung M745 Service Manual

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SERVICE
MICROWAVE OVEN
TAWIL
MICROWAVE OVEN
M745
Manual
0.1 kg
Auto
h
min
10s.
10min
1min
1min+
M745
8. PCB Diagrams
CONTENTS

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Summary of Contents for Samsung M745

  • Page 1: Table Of Contents

    MICROWAVE OVEN M745 SERVICE Manual MICROWAVE OVEN CONTENTS 1. Precaution 2. Specifications 3. Operating Instructions 4. Disassembly and Reassembly 5. Alignment and Adjustments 0.1 kg Auto 10s. 10min 1min 6. Troubleshooting 1min+ M745 7. Exploded Views and Parts List 8. PCB Diagrams 9.
  • Page 2 ELECTRONICS © Samsung Electronics Co., Ltd.December 1997 Printed in Korea DE68-62332A...
  • Page 3 (e) A Microwave leakage check to verify compliance with the Federal performance standard should be performed on each oven prior to release to the owner. Samsung Electronics...

  • Page 4: Precaution

    CENTRAL SERVICE CENTER 16. Always connect a test instrument's ground 10. Service technicians should remove their lead to the instrument chassis ground before watches while repairing an MWO. connecting the positive lead; always remove the instrument's ground lead last. Samsung Electronics...
  • Page 5 (Use a screwdriver.) 3. High voltage is maintained within specified limits by close-tolerance, safety-related components and adjustments. If the high voltage exceeds the specified limits, check each of the special components. Fig. 1-1. Discharging the High Voltage Capacitor Samsung Electronics...

  • Page 6: Specifications

    2. Specifications 2-1 Table of Specifications TIMER 99 MINUTES 90 SECONDS POWER LEVEL ON TIME OFF TIME POWER SOURCE 230V 50Hz, AC M745 POWER CONSUMPTION MICROWAVE : 1,300W 4 sec 26 sec 160W 7 sec 23 sec OUTPUT POWER FROM 80 TO 800W (10 LEVEL POWER)

  • Page 7: Operating Instructions

    Auto Power Level Selection Button Clock Setting Button Timer Setting Button 10s. 1min 10min Cancel Button Standard Boost Button 1min+ M745 3-2 Features & External Views Ventilation Slot Light Door Safety Interlock Holes 0.1 kg Auto Control Panel Door Latches 10s.

  • Page 8: Disassembly And Reassembly

    4-2 Replacement of High Voltage Transformer 1. Discharge the high voltage capacitor. 2. Disconnect all the leads. 3. Remove the mounting bolts. 4. Reconnect the leads correctly and firmly. H. V. Trans Screws Samsung Electronics...
  • Page 9 1. Insertion depth of the thin metal plate should be 0.5mm or less. 4-3-4 Removal of Key Door & Spring Door "E" Remove pin hinge from Door "E" Detach spring from Door "E" and key door. Key Door Spring Samsung Electronics...
  • Page 10 Base Plate Drive Motor Cover 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. Samsung Electronics...
  • Page 11 3. When installing new membrane key board, make sure that the surface of escutcheon base is cleaned sufficiently so that any problems Membrane (shorted contacts or uneven surface) can be Panel avoided. Samsung Electronics...

  • Page 12: Alignment And Adjustments

    3. Before touching any oven components or wiring, always unplug the oven from its power source and discharge the high voltage capacitor. 5-1 High Voltage Transformer 1. Remove connectors from the transformer terminals Filament Terminals and check continuity. 2. Normal resistance readings are as follows: MODEL M745 Secondary Approx. 130W Filament Approx.0W Primary Approx.1.700W...
  • Page 13 ¥ Primary switch ¥ Monitor switch (COM-NC) 5. Confirm that the gap between the switch ¥ Monitor switch (COM-NO) housing and the switch actuator is no more than ¥ Door Sensing S/W 0.5mm when door is closed. Samsung Electronics...
  • Page 14 5. After heating for 2 minutes, measure the water temperature in each beaker. 6. Microwave heat distribution rate can be calculated as follows: Minimum Temperature Rise Beaker Heat Distribution = X 100(%) Maximum Temperature Rise The result should exceed 65%. Cooking Tray Samsung Electronics...
  • Page 15 10min 1min inch spacer cone with the probe. Hold the probe 1min+ M745 perpendicular to the cabinet door. Place the spacer cone of the probe on the door and/or cabinet door seam and move along the seam, the door viewing window and the exhaust openings moving the probe in a clockwise direction at a rate of 1 inch/sec.

  • Page 16: Troubleshooting

    H.V.Transformer component test procedure and replace if it is H.V.Capacitor defective. H.V.Diode, H.V.Fuse Magnetron 4. Open or loose wiring of power relay 5. Defective primary latch switch 6. Defective power relay or Ass'y PCB Replace PCB main. Samsung Electronics...
  • Page 17 Use plastic wrap or cover with a lid. Stir once or twice while cooking foods such as soup, cocoa, or milk. Noise from the turntable motor Noise may result from the motor. Replace turntable motor. when it starts to operate. Samsung Electronics...

  • Page 18: Exploded Views And Parts List

    7. Exploded Views and Parts List 7-1 Exploded Views M 31 Samsung Electronics...
  • Page 19 FAN-MOTOR;SMF745EA 230V/50HZ ASSY-FAN-MO DE39-20054D ASSY POWER CORD;KKP-4819D/B206 250V6A L1500 DE39-40537A ASSY WIRE HARNESS-A;230V50HZ M945(SAW) DE47-20009A THERMOSTAT;CS-7SA(160/60)187Y 250V7.5A 1 DE03-30029A MAGNETRON;OM75SH(31)ESS DE71-60010A COVER-AIR;PP(TB53) T1.7 WHT 64G M745 M 10 4713-001004 LAMP-INCANDESCENT;230V,-,40W,ORG,-,-,25x M 11 DE93-20001A ASSY BODY LATCH;2ND-W1 M97G45/M9745 M 12 3405-000178 SWITCH-MICRO;VP-533A-OF-PS(T85) 250V,15A...
  • Page 20 Remarks DE64-40007A DOOR-A;ABS(VH-080) T3.0 WHT DE64-40006A DOOR-KEY;POM(TC3005) T2.0 12GR BLK CE9 DE61-70033A SPRING-KEY;ES HSWR10 PI0.6 D6.0 L22.3 BL DE01-00003A FILM-DOOR;PE-FILM T0.15 W143 L265 M745 DE92-50126B ASSY DOOR-E;COATING BLK CE745G DE64-40008B DOOR-C;PP T1.5 BLK CE745G DE67-20004A SCREEN-DOOR;ACRYL T1.5 W173.6 L373.5 DE02-00125A TAPE-DOUBLE FACE;ACRYL T0.45 W9 WHT WF103...
  • Page 21 8. P.C.B Diagrams 8-1 P.C.B Diagrams Samsung Electronics...
  • Page 22 ZD02 A4106-0204 DIODE-ZENER;TZP7.5B 7.5/8.4V 40MA T 1W ZD01 A6010-0461 CONNECTOR-WAFER;YW396-04V WHT CN02 DE07-20126A LED DISPLAY;LTC4638GKC GRN 12 30 48.2X22.38 LED1 DE09-30487A IC-MCU;KS57C0004-64 DIP M745(2ND-W,LED,EURO) IC01 DE13-20009A IC;KA7533 DIP IC03 DE13-20033A IC-DRIVE;UDN6118A DIP IC02 DE26-20146A TRANS-L.V;SLV-745E 230V 50HZ AC17/7V LVT1 DE30-20016A BUZZER;CBE2220BA STICK...

  • Page 23: Schematic Diagrams

    : P.C.B IN/OUT ORANGE POINT ASSY MAIN P.C.B WHITE BLACK YELLOW DOOR MONITOR PRIMARY GREEN SENSING SWITCH LATCH YELLOW/GREEN SWITCH SWITCH MAGNETRON HIGH VOLTAGE DIODE TO CHASSIS HIGH VOLTAGE CAPACITOR H.V.FUSE SYMBOL COLOR ORANGE BROWN BLUE HIGH VOLTAGE TRANSFORMER Samsung Electronics...