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Troubleshooting
Troubleshooting
In most cases you will be able to identify and remedy faults by checking the following.
Check whether:
the upper and lower threads are threaded correctly
the needle is inserted correctly with the flat side to the back
the needle size is correct - check the needle/thread table page 22
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
Upper thread breaks
Lower thread breaks
Needle breaks
Thread is caught in
the area of the
take-up lever
Faulty stitching
Sewing computer
Cause
Upper thread too tight/too slack
Needle blunt or bent, poor-quality needle
Needle inserted incorrectly
Poor-quality thread
Needle/thread combination is incorrect
Incorrectly threaded
Incorrect needle system
Needle blunt or bent, poor-quality needle
Needle inserted incorrectly
Incorrect needle point
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 thick material
used
Poor-quality thread, unevenly wound or
knotted
Upper thread breaks
Remnants of thread between the tension
discs
Incorrect threading
Remnants of thread under the bobbin case
spring
Sewing computer fails to run or runs slowly
Repair
Reduce/increase upper thread tension
Use new, high-quality needle (BERNINA)
The flat side of the shank must be to the back
Use quality threads (Isacord, Mettler, Gütermann)
Match the needle to the thread size
Check upper thread threading path/lower thread threading path
Use needle system 130/705 H
Use new, good quality needles
Insert needle as far up as it will go
Match the needle type to the fabric
Reduce upper thread tension
Check upper thread threading path
Use high-quality thread
Have sewing computer checked by a specialized dealer
Reduce lower thread tension
Have sewing computer checked by a specialized 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 high-quality thread
If the lower 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 on the headframe with the angular Torx button
turn headframe cover slightly to the left, then slide it upwards
remove remnants of thread
attach headframe and retighten screw
Fold a piece of thin fabric 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
Plug not properly inserted
Power switch to «0» (off)
Sewing computer has been standing in a cold room
033301.71.04_2014-02_Manual_B330_B350_PE_B380_EN
46


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