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General| Stitch Type | Lockstitch |
|---|---|
| Max Sewing Speed | 3, 000 sti/min |
| Power Consumption | 550W |
| Needle Bar Stroke | 41.2 mm |
| Needle Type | DP×5 |
| Number of Patterns | 50 standard patterns |
| Sewing Area | 30mm x 40mm |
| Lubrication | Automatic lubrication |
| Presser Foot Lift | 17mm (max) |
Details model applications like Bartacking and Belt-loop attaching.
Specifies the X and Y direction sewing limits for the machine.
Lists the maximum sewing speed ratings for different models.
Identifies and labels the major components of the sewing machine head.
Explains the function of each button on the control panel.
Procedures for connecting and disconnecting the main shaft assembly.
Adjusting the backlash and connection/disconnection of the lower shaft.
Detailed steps for performing hook adjustments on the sewing machine.
Adjusting the thread trimmer and presser foot origin sensors.
Instructions on how to adjust the Y origin sensor.
Adjusting the position of X/Y feed motors and driving gear backlash.
Classifies models based on button sizes for the LK-1903A.
Lists standard sewing patterns, stitches, and lengths for LK-1903A.
How to start and change memory switch settings on the machine.
Details functions, settings, and states of various memory switches.
Instructions on how to start the test mode for diagnostics.
Performing a display output test within the test mode.
How to confirm results for each test program.
Details and diagrams of various printed wiring boards used in the machine.
Information about the data ROM and how to set dipswitches.
Specifications for standard sewing patterns available on the machine.
Instructions on how to connect the PK-57 optional feature.
Lists available optional parts, their types, and part numbers.
Details and diagrams of different types of work clamp feet.
Instructions for replacing fuses in the sewing machine.
How to change voltage specifications between 100V and 200V.
Information on recommended greases and their applications.
Diagrams illustrating specific parts requiring grease application.
Detailed steps for greasing specific machine parts.
Troubleshooting guide for common mechanical issues.
Troubleshooting guide for issues related to sewing conditions.
Troubleshooting guide for electrical and electronic issues.
Overall block diagram of the machine's electrical system.
Detailed circuit diagrams for the power supply system.
Circuit diagram specifically for the servo motor.
Circuit diagram showing sensor and pedal VR connections.
Circuit diagram for the MAIN and PANEL boards.
Circuit diagram illustrating motor and solenoid connections.
Dimensional drawings for longitudinal table installation.
Dimensional drawings for lateral table installation.
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