Manual for a Brother Sewing Machine LX3125

The Brother LX3125 is a versatile mechanical sewing machine designed for home use, featuring 25 built-in stitches, automatic 4-step buttonholer, drop-in bobbin system, built-in needle threader, adjustable stitch length and width, free arm capability, and multiple presser feet. Powered by 120V AC, this machine is ideal for basic sewing, decorative stitching, and garment construction. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation & Setup 3. First-Time Operation 4. Specifications 5. Controls and Settings 6. Stitch Selection & Functions 7. Threading & Bobbin Winding 8. Maintenance & Cleaning 9. Accessories Included 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: 25 built-in stitches, automatic 4-step buttonholer, drop-in bobbin system, built-in needle threader, free arm, LED light, and multiple presser feet.

FeatureDescription
Built-in stitches25 stitches including utility, decorative, and stretch
Automatic buttonholer4-step buttonhole for consistent results
Drop-in bobbinEasy-to-load top drop-in bobbin system
Built-in needle threaderAutomatically threads needle for ease
Free armRemovable extension table for sewing cuffs and sleeves
LED lightBright illumination of sewing area
Stitch length/width controlAdjustable for custom stitching
Reverse sewing leverFor reinforcing seams
Power switchTurns machine on/off
Foot pedalControls sewing speed

Installation & Setup

Unpack and inspect contents. Place on stable surface.

  1. Remove machine from packaging: Lift carefully from carrying case.
  2. Attach power cord: Plug into machine and wall outlet (120V AC).
  3. Install foot pedal: Place on floor near machine.
  4. Attach accessory tray: Snap into place on free arm.
  5. Insert needle: Loosen needle clamp screw, insert needle with flat side to back.

WARNING! Keep fingers away from needle area during operation. Unplug when not in use.

First-Time Operation

Power on machine; follow setup steps.

  1. Thread machine: Follow threading guide printed on machine.
  2. Wind bobbin: Place thread on spool pin, wind bobbin using bobbin winding system.
  3. Insert bobbin: Drop bobbin into bobbin case with thread clockwise.
  4. Select stitch: Turn stitch selection dial to desired pattern.
  5. Test sew: Use scrap fabric to test stitch and tension settings.

CAUTION! Always start with needle in highest position. Use proper needle for fabric type.

Specifications

Controls and Settings

Main controls: Stitch selection dial, stitch length dial, stitch width dial, reverse lever, power switch.

Stitch Selection: Turn dial to select from 25 stitches (1-6: utility, 7-25: decorative/stretch).

Stitch Length: Adjust from 0-4mm (0 for darning, 4 for basting).

Stitch Width: Adjust from 0-5mm for zigzag and decorative stitches.

Reverse Lever: Hold down to reinforce stitching at beginning/end of seams.

Stitch Selection & Functions

Stitch patterns include straight, zigzag, stretch, blind hem, and decorative stitches.

  1. Straight stitch: For basic sewing (position 1)
  2. Zigzag stitch: For finishing edges and appliqué
  3. Blind hem stitch: For nearly invisible hems
  4. Stretch stitches: For knit fabrics
  5. Decorative stitches: For embellishments
  6. Buttonhole: 4-step process for perfect buttonholes

Tip: Always test stitch on scrap fabric before sewing project.

Threading & Bobbin Winding

Proper threading ensures smooth operation.

  1. Raise presser foot and needle to highest position.
  2. Place spool on spool pin.
  3. Follow threading guide: Through tension discs, take-up lever, and needle.
  4. Use built-in needle threader: Push lever down to thread needle.
  5. Wind bobbin: Place empty bobbin on winder, guide thread, press pedal.
  6. Insert bobbin: Drop into case, pull thread through slot.

WARNING! Ensure machine is off when threading. Keep hands clear of moving parts.

Maintenance & Cleaning

Regular maintenance ensures optimal performance.

  1. Clean lint: Remove bobbin case and brush out lint regularly.
  2. Oil machine: Apply sewing machine oil to moving parts as directed in manual.
  3. Change needle: Replace needle after 8-10 hours of sewing or if damaged.
  4. Store properly: Cover machine when not in use.

CAUTION! Unplug machine before cleaning or maintenance.

Accessories Included

Regulatory Information

UL Listed: Complies with safety standards for household sewing machines. Copyright © Brother Industries, Ltd. For support, visit www.brother-usa.com or contact 1-877-467-4289. This product meets energy efficiency standards and contains no user-serviceable parts.

Troubleshooting

SymptomPossible CauseCorrective Action
Machine won't startPower connectionCheck power cord; ensure switch is on; test outlet.
Thread breakingTension/thread qualityRethread machine; adjust tension; use quality thread.
Skip stitchesNeedle/thread mismatchReplace needle; ensure correct needle for fabric.
Bobbin issuesImproper winding/insertionRewind bobbin; ensure inserted correctly.
Uneven stitchesTension settingsAdjust upper and lower tension; clean machine.

Reset: Turn machine off and on if electronic issues occur.

Service: 1-877-467-4289; www.brother-usa.com

Manual for a Brother Sewing Machine LX3125 © - All Rights Reserved 2025