15Operating instructions
CFL Sewing Light (CFL = Cool Fluorescent Light)
Contrary to an ordinary bulb, the CFL sewing
light has a better illumination and a longer
life.
A
Upper Thread Tension
The Basic Setting
• is indicated when the red line on the
tension adjustment wheel is in line with
the marking A
• the tension does not need adjusting for
normal sewing work
• for special sewing work, the tension can
be adjusted to suit the fabric
Thread Tension Settings
Perfect Stitch Formation
• the stitch formation is in the fabric
Upper Thread Tension too Tight
•the lower thread is pulled more to the
right side of the fabric
• to reduce the upper thread tension turn
tension adjustment wheel to 3 - 1
Upper Thread Tension too Loose
• the upper thread is pulled more to the
wrong side of the fabric
• to increase the upper thread tension turn
tension adjustment wheel to 5 - 10
The tension is factory set for the best results
with Metrosene 100/2 threads (Arova Mettler,
Switzerland).
If other threads are used, the tension may
need adjusting to suit the fabric and chosen
stitch.
Caution:
Please note that a defective
CFL sewing light must ONLY
be replaced by an authorized
technician. The sewing
computer must be brought to
an authorized BERNINA
dealer!
For example:
Tension Needle
Metallic
thread approx. 3 90
Mono-
filament approx. 2-4 80
