Checking performance problems, What – Kenmore 1250 User Manual
Page 41
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Checking Performance Problems
what
to
do
PROBLEM^ :
PROBABLE
CAUSE
CORRECTION
Irregular
Stitches
Incorrect size needle,
improper threading.
Loose upper thread tension.
Pulling fabric.
Light pressure On presser foot.
Loose presser foot.
Unevenly wound bobbin.
Nicks or burrs on shuttle.
Nicks or burrs at hole of needle
plate. ■■■:„ '■
Choose correct size needle for thread and fabric.
Rethread machine.
Tighten upper thread tension.
Do not pull fabric; guide it gently.
Increase pressure on presser foot
Reset presser foot
Rewind bobbin.
Replace shuttle, or polish off burrs completely.
Replace needle plate, or polish off burrs completely.
Pulling fabric.
Do not pull fabric; guide it gently.
. . .Breaking- ■,
Incorrect size needle.
Choose correct size needle for thread and fabric.
Needle
Incorrect setting of needle.
Loose presser foot.
Reset needle. •
Reset presser foot
Bunching of
Upp>er and lower threads not drawn
When starting a seam be sure to draw both threads under and
back under presser foot before
back of presser foot about 4" and hold until a few stitches
. Thread . ,
starting seam.
are formed.
Puckering
Incorrect thread tension(s).
Light pressure on presser foot.
Using two different sizes or kinds
of thread.
Bent or blunt needle.
Loose presser foot.
Fabric too sheer or too soft.
Reset thread tension(s).
increase pressure on presser foot
Upper thread and bobbin thread should be same size an4 kind.
Insert new needle.
Reset presser foot
Use underlay of tissue paper. ^ ^ ^