247Embroidery Support – Trouble Shooting
Titel 1Trouble Shooting
Prevention and Remedy of Failures
Note the following advice to recognize the causes of most of the operation failures in the
embroidery computer that might occur.
Check First Whether:
• upper and lower threads are threaded correctly
• the needle is inserted correctly - flat part of the
shank to the back
• the needle is the correct size (see Needle/Thread
Chart on pages 17-19)
• the embroidery computer is clean - remove any
thread lint
• the hook race is clean
• bits of thread are trapped between the tension
disks and under the bobbin case spring
Upper Thread Breaks
• upper thread tension is too tight
• use of low quality needle. It is best to buy
needles in a BERNINA store
• needle has been inserted incorrectly. The flat
part of the shank must be to the back
• needle is blunt or bent
• use of poor quality thread, thread with knots,
thread too old or dried out
• use appropriate spool disc
• use net for even unwinding of thread (pull over
upper thread spool)
• stitch plate hole or hook tip is damaged: take
the embroidery computer to an authorized
BERNINA dealer
• reduce embroidery speed
Lower Thread Breaks
•
lower thread tension is too tight
• lower thread is trapped in the embroidery
bobbin case. Replace bobbin
•
needle is blunt or bent
• the stitch plate hole has been damaged by the
needle. It must be polished by a BERNINA
Technician
Skipped Stitches
• incorrect needle used. Use only 130/705H needle
system
•
needle is bent or blunt or not correctly inserted.
Push all the way to the top when inserting
• low quality, badly polished needle used
Needle Breaks
•
needle clamp screw is too loose
• defective stitch plate
Unsatisfactory Stitch Formation
• remnants of thread between tension disks: pull
folded thin fabric (use the fold, not an outer
edge) back and forth between the tension disks
to clean the left and right side of the thread
tension
• remove any remnants of thread from under the
bobbin case spring
• adjust thread tension
• used wrong or no stabilizer at all
• incorrectly threaded - check upper and lower
thread
• when embroidering, thread pigtail tensioner with
lower thread
• use appropriate spool disc
• clean and oil hook (use original oiler only. See
Cleaning and Lubricating on page 179)
Embroidery Computer Fails to Run or Runs
Slowly
• plug not fully inserted
• power switch in «0» (off) position
• embroidery computer has been standing in a
cold room
Defective Sewing Light
•
take the embroidery computer to an authorized
BERNINA dealer
Lower Thread Indicator Sensor
• bobbin cover is not closed
•
not activated in the Setup Program
• remove any thread lint and remnants
from the bobbin case
Upper Thread Indicator Sensor
• not activated in the Setup Program
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