Page 32
Baby Lock Tiara II Instruction Manual
Needle Thread Breaks
Corrective Measure
• Check the tension of the top thread tension assembly and bobbin for proper
balance (see pages 20-21).
• Top and bobbin tension not
balanced
• Look for severe twisting of threads when approximately 12 to 15 inches has
been pulled off, with ends pinched together. Cotton threads are particularly
susceptible to dry rot which makes thread brittle. Do not use poor quality
thread, or thread that is rotted or brittle.
• Thread cones/spools are poor
quality or may have severe
twisting or thread rot
• Check that the machine is threaded correctly.
• The machine head has been
threaded incorrectly or thread
spools are not positioned cor-
rectly
• Inspect for accidental double wrapping of thread on thread guides.
• Inspect the thread antennae making sure the eyelets of the antennae are
directly over the spools.
• Inspect the vertical positioning of the thread cones. Tipped cones can dra-
matically affect thread tension and can cause breakage.
• Inspect for particles and remove any lint or debris.
• Particles in tension discs
• Change the bobbin. The slightest hesitation of the bobbin rotation can be the
cause of dramatic tension change and thread breakage. Use ONLY Baby Lock
bobbins
• Bobbin rotation is not smooth
• Change the needle at least once per quilt. Make sure the needle is installed to
the top of the sight hole inside the needle bar.
• Needle is burred, bent, dull, or
installed incorrectly
• Replace the needle with one better suited for the thread. Use the proper size
needle.
• Needle not suited for the
thread
• Move more quickly so stitches don’t overlap or build up. When starting the
machine, begin moving immediately. Sewing in one place too long will cause
the thread to break.
• Hesitating too long at one
point in the pattern
• Timing of the machine is improper. Consult a your authorized Baby Lock
retailer.
• Improper needle/hook rela-
tionship
• If the thread is shredding at the needle plate, check for burrs or jagged edges.
Gently rub with metal cloth to remove the sharp edge. Consult your author-
ized Baby Lock retailer to polish any hard to reach or delicate areas, or if the
burr is inside the hole.
• Damage or burr at the needle
hole in the needle plate or any
other place along the thread
path
• Use needles recommended by Baby Lock. Using the wrong needle with a
smaller shank diameter causes many problems. For example a system 1738
or 287WH needle with a shank diameter of 1.64mm will fit loosely inside the
needle clamp at an angle. This may cause skipped stitches because the needle
is positioned too far away from the hook point. It can also cause the needle
to hit the hook, breaking the needle.
• Wrong type of needle
• The needle is too close to the hook, which causes friction and a possible colli-
sion of the hook point and the needle.
• Other possible causes:
• Needle plate damage.
• Hook damage.
• Broken needle inside needle bar clamp, preventing insertion of the needle to
the top of the needle clamp.
• Damaged needle bar clamp.
No Visible Display
Corrective Measure
• Check the communication cable that connects the display to the machine
and make sure the connection is secure.
• Cable unplugged
Troubleshooting
