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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
Fault
Uneven stitch
formation
Skipped stitches
Faulty stitching
Thread is caught
in the area of the
take-up lever
Upper thread
breaks
Cause
̶ Upper thread too tight/too slack
̶ Needle blunt or bent
̶ Poor quality needle
̶ Poor quality thread
̶ Needle/thread combination is incorrect
̶ Incorrectly threaded
̶ Incorrect needle system
̶ Needle bent or blunt
̶ Poor quality needle
̶ Needle inserted incorrectly
̶ Incorrect needle point
̶ Remnants of thread between the
tension discs
̶ Incorrectly threaded
̶ Remnants of thread under the bobbin
case spring
̶ Upper thread breaks
̶ Upper thread tension too tight
̶ Incorrectly threaded
̶ Poor-quality or old thread
̶ Stitch plate or hook tip damaged
Repair
reduce/increase upper thread tension
use new BERNINA quality needles
use new BERNINA quality needles
use quality thread (Isacord, Mettler, Gütermann etc.)
match the needle to the thread size
check upper and lower thread
use needle system 130/705H
use new BERNINA quality needles
use new BERNINA quality needles
insert needle as far up as it will go
match the needle point to the texture of the fabric
fold a piece of thin material and slide the folded edge (not the
raw edges) between the thread tension discs, moving the
fabric 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
If the upper thread breaks and the thread is trapped in the area
of the take-up lever, proceed as follows:
power switch to «0» (off)
remove the screw A on the headframe with the angular Torx
button
turn headframe cover slightly to the left, then slide it upwards
and remove
remove remnants of thread
attach headframe and retighten screw
reduce upper thread tension
check upper thread
use quality threads (Isacord, Mettler, Gütermann)
take the sewing computer to the nearest authorized
BERNINA dealer
A
033471.52.04_2014-02_Manual_B530_550_EN
77


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