Tajima TMBR-SC: Bird’s Nesting Troubleshooting & Repair Guide

1. Incorrect Upper Thread Tension high likelihood

How to tell

Observe loose loops of upper thread on the underside of the fabric. The upper thread may appear too slack during stitching.

Fix

1. Locate the upper thread tension dial for the affected head.
2. Turn the tension dial clockwise in small increments (e.g., 1/4 to 1/2 turn) to increase tension.
3. Perform a test sew on a scrap piece of fabric to check stitch balance. The upper thread should meet the bobbin thread in the middle of the fabric layers.
4. Adjust further as needed until the stitch is balanced, with no loops on the underside and the upper thread not pulling through to the top.

Parts involved: Thread path & tension →

2. Improper Upper Threading high likelihood

How to tell

The upper thread may slip out of guides, tension discs, or the take-up lever during operation, leading to slack thread pooling under the fabric.

Fix

1. Unthread the entire upper thread path for the affected head.
2. Carefully re-thread the machine, ensuring the thread passes through every guide, between the tension discs (ensure it's seated deeply), and correctly through the take-up lever eye.
3. Verify the thread is not snagged or caught anywhere along its path from the cone to the needle.

Parts involved: Thread path & tension →

3. Bobbin Thread Issues high likelihood

How to tell

Bobbin thread may be wound unevenly, too loose, or too tight. The bobbin case might be damaged or dirty. A 'pull test' on the bobbin thread will reveal incorrect tension.

Fix

1. Remove the bobbin and inspect its winding. If uneven or overfilled, replace it with a freshly and evenly wound bobbin.
2. Insert the bobbin into the bobbin case. Hold the bobbin case by the thread and give it a slight tug. The bobbin should unspool smoothly with slight, consistent resistance. If it pulls freely or is too tight, adjust the bobbin case tension screw (small screw on the side of the bobbin case) in small increments.
3. Inspect the bobbin case for any burrs, nicks, or damage, especially around the tension spring or thread exit point. Replace the bobbin case if damaged.
4. Clean any lint or debris from the bobbin case and the bobbin area of the rotary hook.

Parts involved: Rotary hooks & bobbin cases → Thread path & tension →

4. Damaged or Incorrect Needle high likelihood

How to tell

The needle may be bent, dull, have a burr, or be the wrong type/size for the fabric and thread. This can cause skipped stitches, fabric damage, or improper loop formation.

Fix

1. Visually inspect the needle for any bends, burrs, or a dull point. Run a finger gently along the needle point (away from the tip) to feel for roughness.
2. Replace the needle immediately if any damage is found. Needles should be replaced after every 8-10 hours of use or when changing fabric types.
3. Ensure the correct needle type (e.g., sharp, ballpoint) and size (e.g., DBxK5, 75/11, 80/12) are used for the specific fabric and thread combination. Refer to your thread manufacturer's recommendations.
4. Ensure the needle is inserted correctly, fully seated into the needle bar, and facing the correct direction (scarf to the back).

Parts involved: Needles & needle bars →

5. Incorrect Presser Foot Height medium likelihood

How to tell

Fabric may move excessively, pucker, or bunch during stitching, especially on varying thicknesses. The presser foot might be too high (not holding fabric) or too low (dragging fabric).

Fix

1. Access the presser foot height adjustment settings on the machine's control panel (refer to your TMBR-SC manual for exact menu navigation).
2. Adjust the presser foot height to apply sufficient pressure to hold the fabric flat without stretching or distorting it. For thicker fabrics, a slightly higher setting might be needed; for thinner fabrics, a lower setting.
3. Perform a test sew on a scrap piece of the same fabric to verify stability. The fabric should remain flat and not shift during embroidery.

Parts involved: Presser feet & sewing parts →

6. Dirty or Damaged Rotary Hook Area medium likelihood

How to tell

Accumulation of lint, dust, and thread fragments in the bobbin case area or within the rotary hook can impede thread movement and stitch formation. Visible debris or rough spots on the hook.

Fix

1. Power off the machine.
2. Remove the needle plate and bobbin case.
3. Using a small brush, compressed air, or a vacuum cleaner designed for electronics, thoroughly clean all lint and debris from the rotary hook area, including the bobbin case housing and the hook itself.
4. Inspect the rotary hook for any nicks, burrs, or damage that could snag the thread. If damage is present, the rotary hook may need replacement.
5. Apply a drop of high-quality machine oil to the rotary hook race as specified in your TMBR-SC maintenance manual.

Parts involved: Rotary hooks & bobbin cases → Lubrication & maintenance →

7. Inadequate Fabric Stabilization medium likelihood

How to tell

Fabric shifts, stretches, or puckers within the hoop during embroidery, leading to inconsistent stitch formation and thread tangles. This is more apparent on thin, stretchy, or unstable fabrics.

Fix

1. Select a stabilizer appropriate for the fabric type and design density. For lightweight or stretchy fabrics, use a cut-away or heavy tear-away stabilizer.
2. Hoop the fabric and stabilizer together, ensuring both are taut and wrinkle-free within the hoop. The fabric should not be stretched excessively, but firmly held.
3. Ensure the hoop is securely attached to the machine's pantograph and has no play.

Parts involved: Hoops & frames → Threads & supplies →

8. Poor Quality Thread low likelihood

How to tell

Inconsistent thread thickness, weak spots, or excessive fuzziness can lead to tension issues, shredding, and poor stitch formation. This can be more noticeable with generic or non-embroidery specific threads.

Fix

1. Use high-quality embroidery thread from reputable manufacturers. Ensure both upper and bobbin threads are suitable for embroidery.
2. Avoid using old or degraded thread, which can become brittle or inconsistent over time.
3. If using a new spool of thread, check for any manufacturing defects or inconsistencies in thickness.

Parts involved: Threads & supplies →

9. Bent or Misaligned Needle Plate low likelihood

How to tell

The needle plate may have visible damage (bends, nicks) or be incorrectly positioned, causing the needle to strike it or impeding fabric/thread movement. This can lead to thread snags or breakage.

Fix

1. Power off the machine.
2. Remove the needle plate and visually inspect it for any bends, burrs, or damage around the needle hole or edges.
3. If damaged, replace the needle plate.
4. When reinstalling, ensure the needle plate is correctly aligned and seated flush with the machine bed. Tighten all retaining screws securely.

Parts involved: Presser feet & sewing parts → Screws, springs & small parts →

10. Improper Lubrication low likelihood

How to tell

Machine parts may feel stiff or make unusual noises. Increased friction in moving parts can affect thread handling and stitch formation. Dry or gummy residue may be visible.

Fix

1. Refer to your Tajima TMBR-SC operator's manual for the specific lubrication points and schedule.
2. Apply high-quality machine oil to all designated lubrication points, such as the rotary hook, needle bars, and other moving components.
3. Avoid over-lubrication, which can attract lint and create a gummy residue. Wipe away any excess oil.

Parts involved: Lubrication & maintenance →

11. Untrimmed Thread Tails low likelihood

How to tell

Long thread tails from previous stitches are visible and can get caught in the bobbin area or rotary hook, leading to tangles.

Fix

1. Before starting a new embroidery section, ensure all previous thread tails (both upper and bobbin) are trimmed close to the fabric.
2. If your machine has an automatic thread trimming function, verify it is working correctly. If not, manually trim threads.

Parts involved: Cutters & trimmers →

12. Software or Design File Issues low likelihood

How to tell

Bird's nesting occurs consistently with a specific design, especially those with very high stitch density, overlapping stitches, or poor digitization. Other designs sew fine.

Fix

1. Review the embroidery design file in your digitizing software. Look for areas of extremely high stitch density, very short stitches, or overlapping elements.
2. Consider reducing stitch density in problematic areas or simplifying complex sections of the design.
3. Test the design on a small, inconspicuous area of fabric or a scrap piece before running the full design.