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
Removing Trapped Thread
If the lower thread breaks and the thread is trap-
ped in the area of the take-up lever, proceed as fol-
lows:
power switch to «0» (off)
•
remove the screw on the head frame with the
•
angular Torx key
pull head frame to the left
•
remove remnants of thread
•
attach head frame and tighten screw
•
Upper Thread Breaks
Possible Faults:
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
Possible Solutions:
attach foam pad
•
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 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
•
Needle is 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
Trouble Shooting
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 185)
Embroidery Computer Fails to Run or Runs
Slowly
plug not fully inserted
•
power switch in «0» (off) position
•
embroidery computer requires normal room tem-
•
perature for operation
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
•
Embroidery Support – Messages
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