Troubleshooting - Bernina 880 Manual

Troubleshooting

Troubleshooting
In most cases you will be able to identify and remedy faults by checking the following.
Various troubles can be eliminated by turning the sewing-/
embroidery computer off and turning it on again after 10 sec.
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 17
⦁
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
Faulty stitching
204
Cause
̶ lower thread incorrectly threaded
̶ upper thread incorrectly threaded
̶ needle blunt or bent
̶ poor quality needle
̶ upper thread too tight/too slack
̶ poor quality thread
̶ needle/thread combination is incorrect
̶ lower thread too tight/too slack
̶ incorrect needle system
̶ needle bent or blunt
̶ poor quality needle
̶ needle/thread combination is incorrect
̶ needle inserted incorrectly
̶ incorrect needle point
̶ needle/thread combination is incorrect
̶ 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 with knots
̶ thread remnants between between the
tension discs of the upper thread
tension
̶ incorrectly threaded
034791.51.04_2014-02_Manual_B880_EN
Repair
⦁ check the threading path of the lower thread
⦁ check the threading path of the upper thread
⦁ use new BERNINA quality needle
⦁ use new BERNINA quality needle
⦁ reduce/increase upper thread tension
⦁ use quality thread (Isacord, Mettler, Gütermann etc.)
⦁
match the needle to the thread size
⦁
reduce/increase lower thread tension
⦁
use needle system 130/705H
⦁
use new BERNINA quality needle
⦁
use new BERNINA quality needle
⦁ match the needle to the thread size, refer to page 17
⦁
insert needle as far up as it will go
⦁
match the needle point to the texture of the material
⦁
match the needle to the thread size
⦁ reduce the upper thread tension
⦁ check the threading path of the upper thread
⦁ use quality thread (Isacord, Mettler, Gütermann etc.)
⦁ take the sewing computer to the nearest authorized
BERNINA dealer
⦁ remove thread remnants at the pre-tension carefully using
tweezers and check the thread lever if necessary, refer to
page 205
⦁ reduce the lower thread tension
⦁ take the sewing computer to the nearest authorized
BERNINA dealer
⦁
use new BERNINA quality 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.)
⦁
fold a piece of thin material and slide the folded edge (not the
raw edges) between the thread tension discs, moving the
material sideways over the front and back of the thread
tension disc
⦁ check upper and lower thread