Manual for Brother LX 3125 Sewing Machine

The Brother LX 3125 is a versatile mechanical sewing machine designed for home use, featuring 25 built-in stitches, 4-step buttonhole, free arm capability, built-in LED light, automatic needle threader, drop-in bobbin system, adjustable stitch length and width, and reverse sewing function. Suitable for various fabrics including cotton, denim, and stretch materials. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.

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

Features at a Glance

Key components: 25 built-in stitches, 4-step buttonhole, free arm, automatic needle threader, drop-in bobbin system, LED light, reverse sewing function.

Feature	Description
Built-in stitches	25 utility and decorative stitches including straight, zigzag, and stretch stitches
4-step buttonhole	Easy buttonhole creation with four simple steps
Free arm capability	Converts for sewing cuffs, sleeves, and other cylindrical items
Automatic needle threader	Quick and easy needle threading
Drop-in bobbin system	Top-loading bobbin with clear cover for easy monitoring
LED light	Bright illumination of sewing area
Reverse sewing lever	Reinforce seams with reverse stitching
Stitch length control	Adjustable from 0-4mm
Stitch width control	Adjustable up to 5mm for zigzag stitches
Power switch	Main power control with built-in light switch

Installation and Setup

Unpack and inspect contents. Place on stable surface at comfortable working height.

Remove packaging materials and protective covers from machine.
Place machine on sturdy table or sewing cabinet.
Connect foot control pedal to machine and plug into power outlet.
Install needle following directional guide (flat side toward back).
Wind and install bobbin in drop-in bobbin case.
Thread upper thread through automatic needle threader.

WARNING! Keep fingers away from needle area during operation. Always turn off power when threading or changing needles.

First-Time Operation

Power on machine; test basic functions before starting projects.

Select straight stitch (position 1 on stitch selector).
Set stitch length to medium (2.5-3.0).
Practice on scrap fabric to test tension and stitch quality.
Experiment with different stitches and settings.
Practice reverse stitching for seam reinforcement.
Test buttonhole function on scrap fabric.

CAUTION! Always start with needle in highest position. Keep work area clean and well-lit.

Specifications

Stitches: 25 built-in stitches including 6 essential, 7 stretch, 12 decorative
Buttonhole: 4-step manual buttonhole
Stitch Length: Adjustable 0-4mm
Stitch Width: Adjustable up to 5mm
Needle System: HA-1 (15x1)
Bobbin: Class 15 transparent bobbin
Max Sewing Speed: 800 stitches per minute
Presser Feet: 4 included (zigzag, zipper, buttonhole, button sewing)
Power Supply: 110-120V, 60Hz
Dimensions: 15.0" x 7.1" x 11.8"
Weight: 13.2 lbs

Controls and Settings

Main controls: Stitch selector dial, stitch length dial, stitch width dial, reverse lever, handwheel.

Stitch Selection: Turn dial to select desired stitch pattern (1-25). Stitch Length: Adjust for shorter or longer stitches (0-4mm). Stitch Width: Adjust zigzag and decorative stitch width (0-5mm). Reverse Lever: Hold down for reverse stitching. Handwheel: Manual needle positioning (turn toward you only).

Stitch Selection Guide

Reference guide for common stitches and their applications.

Stitch Number	Type	Recommended Use
1	Straight	Basic seams, topstitching
2-3	Zigzag	Finishing edges, appliqué
4-6	Stretch stitches	Knits, jersey fabrics
7-12	Decorative	Embroidery, decorative seams
13-25	Utility/Decorative	Various sewing applications

Threading and Bobbin

Proper threading ensures optimal stitch quality and prevents thread jams.

Upper Threading: Follow numbered guide on machine. Use automatic needle threader for easy threading.
Bobbin Winding: Place spool on pin, thread through tension disc, wind bobbin until 80% full.
Bobbin Installation: Drop bobbin into case with thread pulling counterclockwise. Pull thread through slot.
Thread Tension: Adjust tension dial (4-5 for normal sewing). Higher numbers for tighter tension.

Tip: Always raise presser foot when threading upper thread for proper tension disk engagement.

Care & Maintenance

Regular maintenance ensures long machine life and consistent performance.

Clean lint and dust from bobbin area after each project.
Oil moving parts as indicated in manual (use sewing machine oil only).
Replace needle regularly (every 8-10 hours of sewing).
Cover machine when not in use to prevent dust accumulation.
Have machine serviced professionally annually.

CAUTION! Unplug machine before cleaning or maintenance. Use only recommended sewing machine oil.

Regulatory Information

UL Listed for safety standards. FCC Part 15 compliant. Copyright © Brother Industries, Ltd. For support, visit www.brother-usa.com or contact 1-877-467-4289. Machine comes with 25-year limited warranty.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Needle breaks	Incorrect needle installation, bent needle	Install new needle correctly (flat side toward back)
Thread bunching	Incorrect threading, tension issues	Re-thread machine completely, check bobbin
Skipped stitches	Dull needle, wrong needle type	Replace needle with correct type for fabric
Machine won't run	Power issues, foot control	Check power connection, ensure foot control is plugged in
Uneven stitches	Tension problems, threading issues	Adjust tension, re-thread upper and bobbin threads

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