Brother MD-741B Manuals

Table of Contents

• • 3

    Safety Instructions
  • 5

    Maintenance and Inspection
  • 7

    Table of Contents

• 8

  1 Machine Specifications

• 9

  2 Notes On Handling

• 10

  3 Function Settings (Operation Panel)

  • 10

    Maximum Sewing Speed and Start Backtack Sewing Speed Setting Methods
  • 11

    Using the LOCK Key
  • 11

    Setting the DIP Switches
  • 12

    Setting Functions
  • 13

    Function List
  • 28

    Clearing Saved Data (Initialization)

• 29

  4 Initializing the Control Box Panel

• 30

  5 ADJUSTING the ROTARY HOOK LUBRICATION AMOUNT (-[]0[], []3[] Specifications)

• 31

  6 Adjustments

  • 31

    Adjusting the Actuator Position
  • 32

    Adjusting the Safety Switch Position
  • 33

    Adjusting the Thread Take-Up Spring
  • 34

    Adjusting Arm Thread Guide R
  • 34

    Adjusting the Presser Foot Height
  • 35

    Adjusting of the Feed Dog Height
  • 36

    Adjusting the Feed Dog Angle
  • 37

    Adjusting the Needle Bar Height
  • 37

    Adjusting the Needle and Feed Mechanism Timing
    • 38

      Adjusting the Needle and Rotary Hook Timing
    • 39

      Adjusting the Thread Trimming Timing
    • 40

      Adjusting the Thread Take-Up Amount (-[][]3 Specifications)
    • 41

      Adjusting the Needle Up Stop Position (When Using the Operation Panel)
    • 42

      Setting the Needle Up Stop Position and Needle Down Stop Position (If Using the Control Box Panel)
    • 44

      Adjusting the Treadle
    • 44

      Adjusting the Presser Foot Floating Amount (Minute Lifting Amount)

• 45

  7 Replacing Parts

  • 45

    Fixed Knife
  • 45

    Movable Knife
  • 46

    Motor and Timing Belt
  • 49

    Rotary Hook RP
  • 50

    Feed Bar Shaft, Lifting Feed Shaft

• 51

  8 APPLYING GREASE (-[]3[], []5[] Specifications)

  • 51

    When Using the Operation Panel
  • 53

    When Using the Control Box Panel

• 55

  9 Control System

• 56

  10 Control Box and Motor

  • 56

    Removing and Installing the Control Box
  • 57

    Control Box and Motor Rating Plate
  • 59

    Control Circuit Board
  • 61

    Checking the Motor and Power Supply
  • 62

    Checking the Solenoids

• 63

  11 Treadle Unit Assembly

  • 63

    Types
  • 64

    Standard Setting Values
  • 65

    Setting Method for Standard Depression Strokes

• 69

  12 Standing Operation Pedal

  • 69

    Installing the Foot Plug
  • 70

    Connectors

• 71

  13 Troubleshooting

  • 71

    Sewing
  • 76

    Error Code Displays

• 81

  14 Segment Display Definition Table