Bernina 990 - Page 106

Maintenance
15 Troubleshooting 106
Time does not remain set
Battery is empty.
►
Change battery. [}see page101]
Battery protection film has not been removed.
►
Removing the Protective Film on the Battery. [}see
page26]
Uneven Stitch Formation
Upper thread too tight or too loose.
►
Adjust the upper thread tension. [}see page50]
►
Check the thread feed from the thread spool.
Needle blunt or bent.
►
Replace the needle, make sure that a new BERNINA
quality needle is used. [}see page33]
Poor quality needle.
►
Use a new BERNINA quality needle.
Poor quality thread.
►
Use quality thread.
Incorrect needle/thread combination.
►
Match the needle with the thread size.
Incorrectly threaded.
►
Rethread the upper thread. [}see page34]
►
Rehtread the bobbin thread. [}see page39]
Fabric was pulled.
►
Feed the fabric evenly.
Incorrect bobbin case is used.
►
Use supplied bobbin case.
Lower thread too tight or too loose.
►
Contact your BERNINA dealer.
Lower Thread Breaks
The bobbin case is damaged.
►
Replace the bobbin case.
The stitch hole in the stitch plate is damaged.
►
Contact your BERNINA dealer to have the damages
repaired.
►
Replace the stitch plate. [}see page30]
Needle blunt or bent.
►
Replace the needle. [}see page33]
Bobbin Thread Indicator doesn't react
The bobbin door cover is opened.
►
Close the bobbin cover.
The bobbin thread indicator is not switched on.
►
Switch on the bobbin thread indicator in the
Settings. [}see page44]
The bobbin thread indicator is defective.
►
Contact your BERNINA dealer.