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Brother SB7900E User Manual

Brother SB7900E
234 pages
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Table of Contents

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Brother SB7900E Specifications

General IconGeneral
Built-in Sewing Stitches240
LCD Touch ScreenYes
USB PortYes
Automatic Needle ThreaderYes
Work Area LightingLED
Stitches240
Buttonhole Styles10
Presser Feet7
Max Sewing Speed850 stitches per minute
LCD ScreenYes
Free ArmYes
TypeEmbroidery and Sewing Machine
Bobbin Winding SystemQuick-Set drop-in bobbin

Summary

4 Sewing Machine Adjustment Procedures

Adjustment: Timing Belt Tension

Method for adjusting the timing belt tension for optimal operation.

Adjustment: Motor Belt Tension

Procedure to adjust the motor belt tension.

Adjustment: Fine Thread Tension

Adjusting the thread tension for proper stitch formation.

Adjustment: Upper Thread Tension

Method for setting the correct upper thread tension.

5 Electronic Parts Failure Investigation

Power Not Coming On Troubleshooting

Troubleshooting steps when the machine does not power on.

Pulse Motors Not Returning to Start Position

Investigating why pulse motors fail to return to their starting position.

Touch Panel Not Working

Troubleshooting steps when the touch panel is unresponsive.

Main Motor Not Turning Troubleshooting

Troubleshooting steps when the main motor fails to operate.

Main Motor Rotation Abnormal Issues

Investigating unstable or abnormal main motor rotation.

Incorrect Pattern Sewing Diagnosis

Diagnosing why the machine does not sew patterns correctly.

Thread Tensioning Incorrect Troubleshooting

Troubleshooting incorrect thread tension issues.

Thread Cutter Malfunction Diagnosis

Diagnosing why the thread cutter is not functioning properly.

Bobbin Winding Failure Troubleshooting

Troubleshooting issues with bobbin winding.

Bobbin Thread Detection Failure

Troubleshooting bobbin thread detection failures.

Upper Thread Sensor Malfunction

Diagnosing issues with the upper thread sensor.

Embroidery Unit Operation Failure

Troubleshooting when the embroidery unit fails to operate.

Error Display Interpretation and Resolution

Interpreting and resolving displayed error messages.

6 Sewing Machine Repair Manual

Power Supply: LCD Display Blank

Troubleshooting when power is on but LCD is blank.

Irregular Motor Rotation Troubleshooting

Diagnosing and resolving issues with irregular motor rotation.

Threading Not Possible Troubleshooting

Troubleshooting problems with thread passing through the needle.

Upper or Lower Thread Tension Problems

Addressing problems with either upper or lower thread tension.

Embroidery Sewing Troubleshooting

Troubleshooting common issues during embroidery sewing.

Needle Breakage Causes and Solutions

Addresses causes and solutions for needle breakage during sewing.

Thread Breakage and Stitch Skipping

Troubleshooting thread breakage and stitch skipping.

Sewing Stops During Operation

Diagnosing and fixing sewing interruptions.

Thread Cutter Malfunction Diagnosis

Diagnosing thread cutter malfunction despite switch activation.

Thread Cutting Failures

Troubleshooting thread cutter failures to cut thread.

Bobbin Winder Shaft Not Turning

Diagnosing why the bobbin winder shaft is not rotating.

Embroidery Unit Non-Operation Troubleshooting

Troubleshooting general non-operation of the embroidery unit.

7 Special Instructions for Wiring

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