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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; see „Overview Needles“ p. 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 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
⦁
Incorrectly threaded
⦁
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) (optional accessory), use height compensating tool
when sewing over a thick seam
⦁
Use high-quality thread
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 on the headframe with the hex key
⦁
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
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