18. Troubleshooting

Problem

Upper thread breaks.

Lower thread breaks.

Skipped stitches occur.

Needle breaks.

Cause

Upper thread tension is too strong.

Needle is installed incorrectly.

Thread is too thick for the needle.

Thread takeup spring tension and height are incorrect.

Damaged or burred rotary hook, needle hole plate or needle

Lower thread tension is too strong.

Corners of needle hole plate or bobbin case are damaged.

Clearance between needle and rotary hook tip is too great.

Incorrect needle and rotary hook timing

Driver is contacting needle more than is necessary.

Needle is bent.

Needle is installed incorrectly.

Needle is striking the button.

Needle is touching the rotary hook.

Needle is bent.

Wayward stitches

Needle is too thin.

Check

Upper thread tension

Needle direction

Thread and needle

Thread takeup spring tension and height

Damage or burring

Lower thread tension

Damage

Needle clearance

Needle bar lift amount

Clearance between driver and needle

Bent needle

Needle direction

Needle down setting

Needle clearance

Needle bar lift amount.

Bent needle

Needle and feed timing

Needle and thread

 

Remedy

Page

 

 

 

 

 

 

 

Adjust the upper thread

27

 

tension.

 

 

 

 

 

 

 

 

 

Install the needle so

27

 

that the groove is facing

 

 

forward.

 

 

 

 

 

Use the correct thread

27

 

for the needle.

 

 

 

 

 

 

 

 

 

Adjust the tension and

29

 

height of the thread

 

 

takeup spring.

 

 

 

 

 

File smooth or replace

 

 

the affected part.

 

 

 

 

 

 

 

 

Adjust the lower thread

28

 

tension.

 

 

 

 

 

 

 

 

 

File smooth or replace

 

 

the affected part.

 

 

 

 

 

 

 

 

Adjust the needle

42

 

clearance.

 

 

 

 

 

 

 

 

 

Adjust the needle bar lift

41

 

amount.

 

 

 

 

 

 

 

 

 

Adjust the driver needle

42

 

guard.

 

 

 

 

 

 

 

 

 

Replace the needle.

 

 

 

 

 

 

 

 

 

 

Install the needle so

27

 

that the groove is facing

 

 

forward.

 

 

 

 

 

Adjust so that the

 

 

needle drops down into

40,46

 

 

the hole of the button.

 

 

 

 

 

Adjust the needle

42

 

clearance.

 

 

 

 

 

 

 

 

 

Adjust the needle bar

41

 

lift amount.

 

 

 

 

 

 

 

 

 

Replace the needle.

 

 

 

 

 

 

 

 

 

 

Adjust the needle

52

 

down detection

 

position.

 

 

 

 

 

Use the correct needle

 

 

for the material.

 

 

 

 

LK3-B448E MARKII/BA-16

69

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Image 76
Brother LK3-B448E instruction manual 40,46
Page 75 Page 77

LK3-B448E specifications

The Brother LK3-B448E is a versatile and innovative sewing machine designed to meet the needs of both home sewers and professionals alike. This comprehensive machine is especially advantageous for users who want to experiment with intricate designs and achieve high-quality results with ease.

At the core of the LK3-B448E lies its advanced computerized technology, which facilitates a seamless sewing experience. The machine features a user-friendly interface, making it accessible for not just experienced sewists but also beginners. The LCD display provides clear visibility of settings, stitch patterns, and design options, ensuring that users have full control over their projects.

One of the standout features of the LK3-B448E is its extensive library of built-in stitch patterns. With over 100 different stitches to choose from, including decorative, utility, and quilting stitches, users can easily customize their sewing to suit any project. In addition to the built-in stitches, this machine supports the use of embroidery patterns and designs, expanding creative possibilities significantly.

The LK3-B448E also incorporates advanced sewing technologies, such as automatic needle threading and a drop-in bobbin system. These features simplify the setup process, allowing users to spend more time sewing and less time managing technicalities. Furthermore, the machine offers adjustable stitch length and width, enabling personalized settings that cater to various fabric types and sewing tasks.

Another remarkable characteristic of the LK3-B448E is its adjustable presser foot pressure. This allows for better control, whether working with delicate fabrics or thicker materials. The machine’s speed controls help manage sewing speed, providing additional comfort for users as they tackle intricate patterns or detailed designs.

The LK3-B448E also supports USB connectivity, enabling users to transfer new designs and updates effortlessly. This feature ensures that the machine remains relevant with cutting-edge patterns and functionalities, extending its lifespan and usability.

In conclusion, the Brother LK3-B448E combines user-friendly design with advanced technology, offering a comprehensive sewing experience. Its extensive features, coupled with customizable settings, make it an ideal choice for both novice and experienced users looking to enhance their sewing projects. With the LK3-B448E, creating beautiful garments and intricate designs is a straightforward and enjoyable process.
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