Specifications

Revised 06/2007
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2-4
S-311
SYMPTOM POSSIBLE CAUSE PROBABLE SOLUTION
TROUBLESHOOTING
The lower thread is
not caught in the
thread retainer after
sewing the
buttonhole
The top thread is
trimmed, but is held
in the material
Thread pick-up does
not catch the upper
thread
The lower thread is
not trimmed
Broken needle
The machine
switched off when
sewing the buttonhole
When sewing the next
buttonhole first
stitches are loose
Big clearance between holder
and throat plate.
The thread retainer is adjusted
incorrectly.
Big clearance between clamps.
Knife for trimming the upper thread
is damaged
Check the shears on the clamp
plate for dullness or damage, and
valves are working properly.
Low air pressure
Incorrectly set parameters for
length of a buttonhole and flybar
length
Loopers are incorrectly adjusted
The shears on the clamp plate do
not operate the right way
The power supply was
disconnected
The top thread is loose
Choked slot in throat plate.
Adjust the clearance between
the holder and throat plate
Re-adjust the thread holder.
Reduce upper thread tension,
adjust the clearance between
clamps 0,005 mm.
Check the knife, re-adjust,
adjust constant tension
Grind or replace
Set the air pressure to
0.45 MPa and higher
Length of a buttonhole and
flybar length must be set in
accordance with installed
clamp plates
Re-adjust
Check the shears,
clean or lubricate
E13
B7
D3
Switch the machine
on and continue according
to section C1
SYMPTOM
POSSIBLE CAUSE
PROBABLE SOLUTION
SERVICE
SECTION
It is recommended to equipped
the machine with the thread
nipper for the following
03.5519.3.013
In case looper 03.5519.3.013 is assembled
In case looper 03.5519.4.013 is assembled
page 1-56
E13
page 1-56
page 1-48
page 1-51
page 1-52