White 1550 - Advanced Troubleshooting; Thread Breaks and Fabric Puckering; Fabric Feed and Machine Sluggishness; Machine Not Sewing Troubleshooting

5.
LOWER
THREAD
BREAKS
*
bobbin
case
threaded
incorrectly
*
bobbin
case
inserted
incorrectly
in
machine
bobbm
wound
unevenly
bobbin
Wound
too
full
*
bobbin
tension
too
tight
*
needle
plate
hole
has
sharp
edges
*
bent
bobbin
*
Poor
quality
thread
6.
FABRIC
PUCKERS
bent
or
blunt
needle
*
upper
thread
tension
too
tight
*
both
upper
and
lower
tensions
too
tight
*
using
two
different
sizes
or
kinds
of
thread
*
fabric
too
sheer
or
soft
(use
tissue
paper
underlay>
7.
MAc
DOES
NOT
FEED
FABRIC
stitch
length
dial
set
at
0
pattern
selector
On
presser
foot
not
down
completely
thread
knotted
under
fabric
8.
BUNCHING
OF
THREAD
UNDER
FABRIC
upper
and
lower
threads
not
drawn
back
under
presser
foot
pattern
selector
on
9.
BOBBIN
DOES
NOT
WIND
PROPERLY
incorrect
threading
for
winding
thread
guide
not
Properly
adjusted
bobbin
spindle
not
positioned
correctly
*
bobbin
winder
stop
not
Positioned
correctly
10.
MACHINE
RUNS
SLUGGISHLY
dirt
or
lint
between
teeth
of
fabric
feed
dirt
or
lint
in
Shuttle
machine
needs
oiling
Stop
motion
knob
not
tighten
11.
MAC,j
WILL
NOISE
cord
not
plugged
into
outlet
*
3 -way
connector
not
plugged
into
machine
socket
*
stop
motion
knob
not
tighten
motor
belt
too
loose
or
broken
I
J
- -
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