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Troubleshooting
Troubleshooting
In most cases you will be able to identify and remedy faults by checking the following.
Check if:
the upper and lower threads are threaded correctly
the needle is inserted correctly
the needle size is correct - check the needle/thread table page 24
the needle tip and shaft are undamaged
the sewing computer is clean - brush out any thread lint
the hook race is clean
any threads are trapped between the tension discs or under the bobbin case spring
Uneven stitch
formation
̶ Upper thread too tight/too slack
̶ Needle blunt or bent
̶ Poor quality needle
̶ Poor quality thread
̶ Needle/thread combination is incorrect
̶ Incorrectly threaded
reduce/increase upper thread tension
use new BERNINA quality needle
use new BERNINA quality needle
use quality thread (Isacord, Mettler, Gütermann etc.)
match the needle to the thread size
check upper and lower thread
Skipped stitches ̶ Incorrect needle system
̶ Needle bent or blunt
̶ Poor quality needle
̶ Needle inserted incorrectly
̶ Incorrect needle point
use needle system 130/705H
use new BERNINA quality needle
use new BERNINA quality needle
insert needle as far up as it will go
match the needle point to the texture of the material
Thread is caught
in the area of the
take-up lever
̶ Upper thread breaks If the upper thread breaks and the thread is trapped in the area
of the take-up lever, proceed as follows:
turn power switch to «0» (off)
remove the screw A on the headframe with the angular Torx
wrench
turn headframe cover slightly to the left, then slide it upwards
and remove
remove remnants of thread
attach headframe and retighten screw
Faulty stitching
Upper thread
breaks
Lower thread
breaks
Needle breaks
̶ Remnants of thread between the
tension discs
̶ Incorrectly threaded
̶ Remnants of thread under the bobbin
case spring
̶ Upper thread tension too tight
̶ Incorrectly threaded
̶ Poor-quality or old thread
̶ Stitch plate or hook tip damaged
̶ Lower thread tension too tight
̶ Stitch hole in the stitch plate has been
damaged
̶ Needle blunt or bent
̶ Needle not correctly inserted
̶ Fabric was pulled
̶ Fabric was pushed when using thick
material
̶ Poor-quality thread, unevenly wound or
knotted
fold a piece of thin material and slide the folded edge (not the
raw edges) between the thread tension discs, moving the
material back and forth to clean the right and left side of the
thread tension
check upper and lower thread
carefully remove any thread remnants from under the spring
reduce upper thread tension
check upper threading
use quality thread (Isacord, Mettler, Gütermann etc.)
take the sewing computer to the nearest authorized
BERNINA dealer
increase the upper thread tension
take the sewing computer to the nearest authorized
BERNINA dealer
use new needle
tighten the needle clamp screw
do not pull the fabric during sewing
use the correct presser foot for thick material (e.g. Jeans foot
No. 8) use height compensating tool when sewing over a
thick seam
use quality thread (Isacord, Mettler, Gütermann etc.)
Fault Cause Repair
A
033527.53.04_2014-07_Manual_B580_EN
160


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