Description of fault Possible cause Error elimination
Needle breakage The needle size is unsuitable
for the material or the thread.
Change the needle size.
The needle hits the fabric
clamps
When changing the seam width
the upper fabric clamps have
not been set apart or not wide
enough.
When changing the seam width
the lower fabric clamps have
not been exchanged.
Check the subclass on the control
panel.
Set the upper fabric clamps apart
as far as required.
Insert lower fabric clamps matching
the sewing equipment.
No reliable seam beginning
or unthreading respectively
The remaining tension is too
tight for the needle thread so
that the thread at the seam
beginning is too short for the
next sewing start.
Readjust the remaining tension
(see Operating Instructions
“Thread tension”).
Faulty feed of the fabric support
plate
The fabric support plates
collides with other components.
Check the motion of the fabric
support plate at low speed to find
possible collisions.
The fabric support plate is only
heavily movable when the
machine is switched off.
Check all components belonging to
the drive of the fabric support
plate.
Faulty rotation of the sew ing
works
The toothed belts are
insufficiently tightened.
Retighten toothed belts or replace
them, if necessary.
Toothed belts and toothed lock
washers are soiled.
Clean the toothed belts and toothed
lock washers. Replace the toothed
belts, if necessary.
The sewing works collides with
other components.
Check the motion of the sewing
works rotation at low speed to find
possible collisions.
The sewing works is only
heavily rotatable when the
machine is switched off.
The adjustable rings at the
hook support drive or at the
needle bar drive are pressed
too tight against the driving
levers or the yoke.
Check the adjusting rings at the
hook support drive and at the needle
bar drive and set a slight clearance,
if required (see chapter “Adjusting
the looping stroke”, “Needle bar
height”, “Spreader plate”).
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