Siruba BH9820 Operation Manual page 46

adjusted properly.
The needle is too thin.
The upper cutter is not so sharp
The pressure is too low to let
upper
The upper cutter can't catch the
upper
Upper thread
thread.
is not cut off.
At the last stitch, the upper
cutter
can't catch the upper thread due
The position of upper cutter
is
The cutter is not so sharp.
The pressure is too low to let
upper
Bottom thread
The position of cutter is improper
is not cut off.
The pressure on cutter for
trimming
Can't hold bottom thread.
Stitch-missing
The leftover part of the upper
at sewing start
thread
The released upper thread is far
from
Low pressure on cutting device
Cutting function Cutter doesn't properly connect
with
abnormal
The cutter is not so sharp.
The tension of upper thread is
so
Low thread The tension of bottom thread is
so
density
The strength and stroke of take-
up
Select needles fit for the
sewing
Replace a new upper cutter
Adjust the pressure
Install a upper thread bend
needle,
and cut the thread at the stitch
Refer to "Needle-jumping", try to
avoid the needle from jumping
Adjust the position of upper cutter
Replace a new cutter.
Adjust the pressure
Adjust the position of the cutter
and
Adjust to a proper cutter
pressure
Adjust the bottom thread
holder
(configuration 01) or bottom
Adjust the assistant thread holder.
Adjust the amount of released
upper
Adjust the pressure to a proper level
Polish the surface of cutting hammer
Replace a new cutter.
Adjust the upper thread tension to
a
Adjust the bottom thread tension to
a
Adjust the strength and stroke
of
38