Brother MD-812 Manuals

Table of Contents

• 2

  Table of Contents
• 4

  Features
• 4

  Description of the Motor
• 5

  Product View/Name of Components
• 6

  Configuration
• 7

  Principle of Control System
• 8

  Drawing for Mounting the Motor
• 9

  Adjustment
• 9

  Position Adjustment for Needle Down Signal
• 9

  DC Servomotor
• 9

  Needle Position Detector (Synchronizer)
• 10

  Synchronizer Model DB2-B737/B748
• 10

  Needle Up Position
• 10

  Needle Down Position
• 10

  When the Synchronizer Is Out of Order
• 11

  Control Box
• 11

  Control Circuit Board
• 12

  Treadle
• 12

  Brush Replacement
• 13

  Motor Brake Spacing
• 13

  Checking the Lamp Terminal Code
• 14

  Standing Work Machine
• 14

  Code Connection
• 14

  Treadle Lever Position
• 15

  Application to Production Control System
• 16

  Operation Instruction
• 16

  Installation of Operation Box
• 16

  Motor Control and Control Box Use
• 17

  Operation Box
• 20

  Block Diagram of Control Circuit
• 20

  Single-Phase/100V
• 21

  Three-Phase/Acv
• 22

  Single-Phase/100V Type #470B
• 23

  Three-Phase/Ac V Type #470
• 24

  Details of Connector Panel
• 26

  Troubleshooting
• 27

  Checking the Motor
• 28

  Checking the Machine Solenoids
• 28

  Solenoid Load of the Machine
• 28

  Hem Sensor
• 29

  B738 Machine Control System Block Diagram
• 30

  B737 Machine Control System Block Diagram
• 31

  B737/B738 Motor Drive Control System Block Diagram