Bernina 530 User Manual page 77

troubleshooting
76
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
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the needle is inserted correctly
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the needle size is correct - check the needle/thread table page 24
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the needle tip and shaft are undamaged
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the sewing computer is clean - brush out any thread lint
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the hook race is clean
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any threads are trapped between the tension discs or under the bobbin case spring
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fault cause
uneven stitch
̶ Upper thread too tight/too slack
formation ̶ Needle blunt or bent
̶ Poor quality needle
̶ Poor quality thread
̶ Needle/thread combination is incorrect
̶ Incorrectly threaded
Skipped stitches ̶ Incorrect needle system
̶ Needle bent or blunt
̶ Poor quality needle
̶ Needle inserted incorrectly
̶ Incorrect needle point
faulty stitching
̶ Remnants of thread between the
̶ Incorrectly threaded
̶ Remnants of thread under the bobbin
thread is caught
̶ Upper thread breaks
in the area of the
take-up lever
upper thread ̶ Upper thread tension too tight
breaks ̶ Incorrectly threaded
̶ Poor-quality or old thread
̶ Stitch plate or hook tip damaged
tension discs
case spring
a
033471.52.04_2014-02_Manual_B530_550_EN
repair
reduce/increase upper thread tension
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use new BERNINA quality needles
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use new BERNINA quality needles
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use quality thread (Isacord, Mettler, Gütermann etc.)
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match the needle to the thread size
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check upper and lower thread
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use needle system 130/705H
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use new BERNINA quality needles
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use new BERNINA quality needles
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insert needle as far up as it will go
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match the needle point to the texture of the fabric
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fold a piece of thin material and slide the folded edge (not the
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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
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carefully remove any thread remnants from under the spring
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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)
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remove the screw a on the headframe with the angular Torx
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button
turn headframe cover slightly to the left, then slide it upwards
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and remove
remove remnants of thread
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attach headframe and retighten screw
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reduce upper thread tension
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check upper thread
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use quality threads (Isacord, Mettler, Gütermann)
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take the sewing computer to the nearest authorized
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BERNINA dealer