Brother SE400 Computerized Sewing & Embroidery Machine: A Step-by-Step Guide

Updated November 2026

The Brother SE400 computerized sewing and embroidery machine combines a full set of built-in utility and decorative stitches with an embroidery unit that handles hoop-based designs. In this guide you will learn how to unpack and set up the machine, thread it correctly, choose needles and stabilizers, sew your first stitches, and run a basic embroidery design from start to finish. The steps below apply to most combination machines of this type, so the habits you build here will carry over to other models too.

What You Need Before You Start

Before you power the machine on, gather the supplies that make setup go smoothly. Most of these are already in the accessory box, but a few items you will need to buy separately.

Shopping for one? See our guide: 6 Best Computerized Sewing & Embroidery Machine by Brothers for Every Need (2026).

• The machine, foot control, power cord and included presser feet
• The embroidery unit and hoops that came with the machine, checked for the correct size
• A pack of universal sewing machine needles in sizes 80/12 and 90/14
• Bobbins compatible with your machine (check the manual for the exact class)
• Spools of all-purpose polyester thread for practice
• Stabilizer (tear-away or cut-away, depending on your fabric)
• Embroidery-quality thread for the top, plus a lightweight bobbin thread
• Fabric scraps for test sewing, such as cotton broadcloth and a stable knit
• Small scissors, a seam ripper and a bobbin winding tool

Manufacturers recommend keeping the original box and foam insert so you can store the machine safely between projects. Keep the manual nearby, because menu layouts and stitch numbers are easiest to confirm there.

Step 1: Unpack, Place and Power Up the Machine

Set the machine on a flat, stable table with room on the left for fabric to hang and on the right for the spool. Remove the packing materials carefully and check that the accessory tray is complete before you discard anything.

1. Lift the machine out of its case while supporting the base, not the arm.
2. Place it on a table that can hold its weight without wobbling.
3. Attach the foot control cord to the back of the machine and plug the power cord into a surge-protected outlet.
4. Turn the machine on and let the display complete its startup screen.

Check the Display and Basic Settings

Once the screen is active, set the language, date and any units the menu asks for. Confirm the stitch selection screen loads and that the needle position controls respond. If a button seems unresponsive, turn the machine off and on again before assuming a fault.

Step 2: Threading the Upper Thread

Correct threading prevents most stitch problems, so take your time. Raise the needle to its highest position using the handwheel or the needle up/down button. Place the spool on the spool pin so the thread unwinds in the direction shown in the manual, and use the spool cap that suits the thread size.

1. Guide the thread through the first thread guide at the top of the machine.
2. Pass it through the tension discs, making sure the thread sits between them.
3. Continue down through the take-up lever guide and the lower guides, following the numbered or color-coded path on the machine.
4. Thread the needle from front to back, or use the built-in needle threader if your model includes one.
5. Pull about 4 to 6 inches of thread through the needle eye before you start sewing.

Winding and Inserting the Bobbin

Wind the bobbin using the bobbin winder, keeping the thread wound evenly and filling the bobbin without overfilling. Place it in the bobbin case, pull the thread through the slot, and check that the bobbin spins in the correct direction. Replace the bobbin case and pull up the bobbin thread to bring the loop to the surface.

Step 3: Choosing the Right Needle, Thread and Fabric Combination

Needle, thread and fabric need to match. A needle that is too heavy will leave holes in lightweight fabric, and a needle that is too fine will skip stitches on denim. The table below gives a practical starting point. Always test on a scrap of the same fabric before you sew the real project.

Fabric	Needle Size	Thread Type	Stabilizer
Quilting cotton	80/12 universal	All-purpose polyester or cotton	Tear-away for embroidery
Denim or canvas	90/14 denim or jeans	Heavier polyester	Cut-away for stability
Lightweight knit	75/11 ballpoint	Stretch or monofilament	Cut-away or wash-away
Silk or chiffon	70/10 universal	Fine polyester	Wash-away or water-soluble

Replace the needle after roughly eight hours of sewing or whenever you notice skipped stitches, a dull point, or thread shredding. Manufacturers generally recommend this interval for home sewing.

Step 4: Sewing Your First Practice Stitches

Before you start a real garment or quilt, run a simple test. Choose a straight stitch, set the length to 2.5 mm and the width to 0, and sew a few inches on a double layer of fabric scraps.

1. Place the fabric under the presser foot and lower the foot.
2. Hold the thread tails lightly as you start, and press the foot control gently.
3. Sew at a steady speed, guiding the fabric with both hands but not pulling it.
4. Stop with the needle down, raise the presser foot, and pull the fabric out toward the back.
5. Cut the threads, leaving a short tail.

Adjusting Tension

Look at both sides of the seam. If the top thread shows on the underside, the upper tension may be too tight. If the bobbin thread shows on top, the upper tension may be too loose or the bobbin is not seated correctly. Make small changes, usually one number at a time, and test again.

Step 5: Running an Embroidery Design

Embroidery is where stabilizer does most of the work. Hoop the stabilizer first, then the fabric on top of it, keeping the fabric smooth and taut without stretching it. Attach the hoop to the embroidery unit, select a design from the built-in library or from a USB stick, and follow the on-screen prompts to check the hoop position.

1. Hoop a piece of stabilizer, then float or hoop your fabric over it.
2. Attach the hoop and confirm the design fits within the hoop area on the screen.
3. Thread the embroidery thread and bobbin with the same care you used for sewing.
4. Start the design and watch the first few color changes for thread breaks or puckering.
5. Trim jump stitches as they appear and remove the hoop only when the design is complete.

Tear away or trim the stabilizer once the design is finished, following the type you chose. Press the piece gently from the wrong side, using a pressing cloth to protect the stitches.

Common Mistakes

• Skipping the test piece. Stitching directly on a project is the fastest way to waste fabric. Always test with a scrap.
• Using the wrong bobbin thread. Heavy thread in the bobbin can cause tension problems, especially with embroidery.
• Forgetting to raise the presser foot. Dropping the foot without raising it after stitching can cause uneven tension and fabric damage.
• Hooping fabric too tightly. Stretched fabric pulls back after removal and distorts the design.
• Pulling the fabric while sewing. Let the feed dogs move the fabric; guide it rather than force it.

Tips for Better Results

• Clean lint from the bobbin area after every project, using the brush included with the machine.
• Change needles before a major project rather than waiting for a problem.
• Keep a notebook with the settings that worked for each fabric and thread combination.
• Store thread away from direct sunlight to prevent fading and weakening.

If you are still getting comfortable with the machine, the guides on the site can help you understand features and settings in more detail. For example, Brother SE700 Computerized Sewing & Embroidery Machine: A Beginner's Guide walks through setup from a beginner’s perspective, and Brother Se625 Computerized Sewing and Embroidery Machine: A Practical Guide (2026) covers a related model with similar embroidery workflows. For general comparisons between machines in this class, 7 Best Combination Computerized Sewing and Embroidery Machines for 2026 gives a broader view of what to look for.

Recommended gear

These supplies make the setup and embroidery steps easier, and each one addresses a common source of frustration.

• Universal sewing machine needles in mixed sizes. Having 80/12 and 90/14 on hand lets you match needle to fabric without a special trip to the store. View on Amazon
• Tear-away embroidery stabilizer. A roll or pack lets you stabilize lightweight and medium woven fabrics for most hoop-based designs. View on Amazon
• Embroidery bobbin thread. Lightweight bobbin thread reduces tension issues on the underside of embroidered designs. View on Amazon
• Bobbin winding and seam ripper set. A small kit covers the tools you will reach for in every session. View on Amazon

FAQ

Do I need stabilizer for every embroidery project?

Almost always, yes. Stabilizer supports the fabric so stitches do not sink in, pucker or distort. The type depends on the fabric: tear-away works well for stable wovens, while cut-away suits knits and stretch fabrics.

How often should I change the needle?

Manufacturers generally suggest replacing the needle after about eight hours of sewing, or sooner if you notice skipped stitches, puckering or thread breaks. Embroidery is hard on needles, so check yours more often during large designs.

Why does my bobbin thread show on top of the fabric?

This usually means the upper tension is too loose, the thread is not seated in the tension disc, or the bobbin case is not correctly inserted. Rethread the top, check the bobbin, and test on a scrap before adjusting further.

Can I use any thread in the bobbin for embroidery?

No. Embroidery bobbin thread is usually finer than standard thread, and it helps keep the underside of designs smooth. Use the bobbin thread recommended in your manual or a lightweight polyester designed for embroidery.

What should I do if the machine stops mid-embroidery?

Stop the machine, check for thread breaks or tangles, and confirm the hoop has not shifted. Consult the manual for how to resume the design from the last completed stitch rather than restarting from the beginning.

How do I clean the machine?

Turn the machine off and unplug it. Remove the bobbin case and brush lint from the bobbin area, the feed dogs and the hook race. Avoid using compressed air close to electronic components, and follow the cleaning schedule in the manual.

Is it safe to leave the machine running unattended?

No. Never leave the machine running without supervision, especially during embroidery, because thread breaks or hoop shifts can cause damage. For any electrical concerns or repairs, consult a qualified sewing machine technician.

Conclusion

With the machine set up, threaded correctly, and tested on scrap fabric, the Brother SE400 computerized sewing and embroidery machine is ready for real projects. Matching needle, thread and stabilizer to your fabric prevents most problems before they start. Keep a settings notebook, clean regularly, and practice on test pieces, and your results will improve with each project.

Related reading

• Brother SE2000 Computerized Sewing and Embroidery Machine Review (2026)
• 6 Best Brother Computerized 103 Stitch Sewing Embroidery Machine Picks (2026)
• Brother Xr3340 Computerized Sewing and Quilting Machine: A Practical Guide (2026)
• Brother XR9550 Computerized Sewing Machine Review: Features and Performance

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