S-4001 ISBH+I SM 30°
2-2
Revised: 10/2017
E-mail: [email protected]; webside: www.amfreece.com
Phone: +420 582 309 146; Fax: +420 582 360 606
TROUBLESHOOTING
1. MECHANICAL FAULTS
FAULT
POSSIBLE CAUSE
PROBABLE SOLUTION
Thread breakage
Needle, looper, throat plate damaged
Change damaged parts
Incorrect needle and sewing mechani-
sm adjustment
Check the adjustment of the mecha-
nisms
Thread tension is too tight
Adjust correct tension
Incorrect threading
See section C3 for checking.
Thread guides polished incorrectly
Polish
Poor thread quality
Replace thread
Thread is too heavy for selected ne-
edle and throat plate
Use recommended thread sizes -
see section A4
Machine fails to
sew
Needle, looper, throat plate damaged
Change damaged parts
Incorrectly adjusted needle bar height See section E4 for checking
Incorrectly adjusted clearance be-
tween needle and throat plate
See section E5 for checking
Incorrect loopers timing
See section E12 for checking
Machine sews in
one spot
Incorrectly adjusted front stop
Adjust the stop - see section E11
Stitch skip at
the beginning of
sewing
Needle, looper, throat plate damaged
Change damaged parts
Needle thread end is too short
See section E13, point 2
Incorrectly adjusted needle bar height See section E4
Incorrectly adjusted clearance be-
tween needle and throat plate
See section E5
Incorrect loopers timing
See section E12
Incorrectly adjusted clamp feet pre-
ssure
See section E 16
Stitch skip during
sewing
Needle, looper, throat plate damaged
Change damaged parts
Incorrectly adjusted needle bar height See section E4
Incorrectly adjusted clearance be-
tween needle and throat plate
See section E5
Incorrect loopers timing
See section E12
Incorrect thread tension adjustment
Adjust the tension correctly see secti-
on E14
Incorrect threading
See section C3
Thread loops are too small
See section E13 point 3
Incorrectly adjusted clamp feet pre-
ssure
See section E16
The clamp feet are adjusted too far
from the sewing
See section E16