Brother International PR670E Operation Manual - Page 222

Symptom Probable Cause/Remedy The upper thread breaks. The bobbin thread is not wound correctly. • Check that the bobbin is wound so that it is about 80% full and that the thread is evenly wound. If the bobbin is not correctly wound, replace the bobbin with one that is correctly wound or rewind the bobbin. A bobbin designed specifically for this machine is not used. • Use the correct bobbin. The automatic needle-threading mechanism is broken. Adhesive is attached to the needle. • Replace the needle. The fabric is not taut. • Firmly set the fabric in the embroidery frame so that it is taut. The thread quality is poor. • The thread quality is too weak due to age of thread. Replace thread. The embroidery data contains stitches with a pitch of zero. • Delete all stitches with a zero pitch. The embroidery data contains many stitches with an extremely small pitch. • Delete all stitches with a small pitch. The thread density of the embroidery data is too fine. Three or more overlapping stitches are being sewn. • Using a data design system, correct the thread density and overstitching settings in the embroidery data. Lint or dust has accumulated in the thread tension disc. • Remove the tension dials, and then remove any lint or dust accumulated between the felt washers. The bobbin thread breaks. The bobbin thread is not correctly threaded. • Correctly thread the bobbin thread. The bobbin is scratched or does not rotate smoothly. • Replace the bobbin. The bobbin case is damaged. • Replace the bobbin case. The thread is tangled. • Remove the thread jammed and clean the hook. A bobbin designed specifically for this machine is not used. • Use the correct bobbin. Lint or dust has accumulated in the thread tension disc. • Remove the tension dials, and then remove any lint or dust accumulated between the felt washers. Page p.30 p.30 * p.79 p.42 p.85 - p.184 p.184 p.123 p.213 p.33 p.33 p.33 p.210 p.30 p.213 Symptom Probable Cause/Remedy Stitches are skipped. The upper thread is not threaded correctly. • Thread the upper thread correctly. The needle is bent or blunt. • Replace the needle with a new one. The needle is not installed correctly. • Correctly install the needle. Dust has accumulated under the needle plate or in the hook. • Clean the hook and the needle plate. The needle and the hook are not correctly passing each other. The thread twist is either too tight or too loose. • Improper twisting results in irregular loop formation. Try using a new spool. The embroidery pattern is misaligned. The thread is tangled. • Use tweezers to remove any tangled thread from the hook. The fabric is not secured in the embroidery frame (for example, the fabric is not taut). • If the fabric is not taut, the pattern may become misaligned or the stitching may shrink. Be sure to correctly frame the fabric in the embroidery frame. The embroidery frame is too large for the size of the embroidery. • Use an embroidery frame that is close to the size of the embroidery. The thumbscrews on the embroidery frame holder are loose. • Use the included disc-shaped screwdriver to firmly tighten the thumbscrews. Stabilizer (backing) is not used. • Use stabilizer (backing) when embroidering on thin or stretch fabrics, fabrics with a coarse weave or fabrics that easily allow the stitching to shrink. Use hard stabilizer when embroidering on a cap made of soft material. The embroidery frame is not correctly attached to the carriage. • Correctly attach the embroidery frame to the carriage. Make sure that the pins on the left and right arms of the embroidery frame holder securely fit into the holes in the handles on the embroidery frame. The carriage or the embroidery frame is hitting objects. • The pattern may become misaligned if the carriage or embroidery frame is hitting objects. Make sure that there are no objects within the operating field of the embroidery frame. The fabric is caught or pinched. • Stop the machine, and then correctly position the fabric. Page p.50 p.30 p.79 p.79 p.210 p.211 * - - p.42 p.85 p.80 p.28 p.84 p.45 - - 220