Service manual

EBS - MARK II
2-3
2. FAULTS OF THE MACHINE EBS MARK II
Revised:05/2013
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TROUBLESHOOTING
2. FAULTS OF THE MACHINE EBS MARK II
FAULT DESCRIPTION FAULT LOCATION FAULT ELIMINATION
Thread tearing Check all mechanical
parts needed for
stitching if they are
not damaged - looper,
stopping of the sewed
piece, thread guard,
looper track, spring in
the needle bar.
Remove all sharp edges
by polishing them, eventually
replace the parts.
Check the proper operation
of the roller on the looper.
Check the value of the
machine’s operating
pressure.
Decrease the pressure to the specified
value.
Needles break Check the needle
bars - opening in
the damson, piston,
cushioning spring.
Demount the needle bars, wash them in
petrol, polish the damaged parts, check
the opening in the piston and damson,
replace the broken cushioning spring.
Assemble the needle bars and adjust
according to chapter no.E 3, E 4 .
Check the adjustment
of the machine for the
chosen button.
Carry out the basic adjustment of the
machine according to the provided
gauge, then adjust the machine to the
chosen button.
Wrong placing of buttons The buttons falls from
the holder.
Check the button holder if the clamping
pins are not damaged, if the spring in
the holder is not broken. Check if there
is no foreign body in the holder track.
The button is not
caught in the
Adjust the button loading according to
chapter no. C 4.
Skip a stitching Wrong adjustment of
the loopers.
Adjust the loopers according to chapter
no. E 6. Check the rollers on the looper.
Bent needle. Replace the needle.
The machine does not
trim threads
Dull cut-off knifes. Replace the faulty knives, adjust
clamping.
Clamping string of
the mobile knife is
cranked.
Replace the string, adjust clamping.
Small tension on the
thread guard.
Increase the thread tension by using the
auxiliary tensioner on the upper cover of
the machine.