-22-
• Please check the following points before
co
lling for repairs
or
service.
•
If
the following suggestion
do
not solve the problem,
tum
off
the machine power supply and contace your nea-
rest Brother service center.
A CAUTION
Tum
off the power supply before adjusting the stitch length, otherwise the machine will operate if the
treadle
is
pressed by mistake, which could result in injury.
However, the motor will keep turning even after the power is switched
off
as a result
of
the motor
's
inertia. Wait until the motor stops fully before starting work.
PROBEM
I.
Uper thread is not tight.
2. Skipped stitches occur
while sewing.
3. Seam position is incorrect.
(Machines with puller)
4. Machine does not feed
work.
5. Upper and lower threads
are
br
eaking.
J
~,-
:s
:.-::.-::.::.::.-::.=---1
1.::========
POSSIBLE CAUSE
• Is the upper thread tension too weak,
or
is the lower thread
tension too strong?
Adjust the upper thread tension
or
lower thread tension.
• Is the position
of
the upper thread take-up thread guide
incorrect?
Adjust the upper thread take-up thread guide position correctly.
• Is the needle properly installed?
If
it is incorrect, insta
ll
the needle correctly.
• Are the looper points dull?
Replace looper with good ones.
• Is the needle and looper timing incorrect?
Adjust the needle and looper timing correctly.
• Is the clearance between needles and loopers incorrect?
Adjust the clearance between needles and loopers correctly.
• Is the lower thread take-up timing incorrect?
Adjust the lower thread take-up timing correctly.
• Is the puller timing incorrect? Adjust the puller timing.
• Is the puller feed incorrect? Adjust the puller feed.
• Is the presser foot pressure incorrect? Adjust the presser foor pressure.
• Is the feed dog height incorrect? Adjust the feed dog height.
• Is the feed dog too low? Adjust the feed
do
g height.
• Is the presser foot pressure too small? Adju
st
the presser foot pressure.
• Is the feed dog worn out? Have serviceman check
it.
• Presser foot floats and does not
fu
lly press work.
Have serviveman check it.
• Feed dog and presser foot work on one side onl
y.
• Is the needle bent
or
is the needle tip broken?
Replace the needle
if
it is bent
or
broken.
• Is the needle properly installed?
If it is incorrect, install the needle correctly.
• Is the needle properly threaded?
If
it is incorrect thread the needle correctl
y.
• Is the upper
or
lower thread tension too weak
or
too strong?
Adjust the upper thread
or
lower thread tension.
• Is the thread
te
lease shaft position incorrect?
Adjust the thread release shaft position correctly.
• Are the needle eyes too
sma
ll for threads?
Refer to the section on "Needles and threads".
• Are the loopers damaged?
Replace loopers with good ones.
PAGE
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