Brother CS-770 - Manual (Page 61)

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4
TROUBLESHOOTING
If the machine stops working properly, check the following possible problems.
If the problem it still there, contact your retailer or the nearest authorised service center.
Symptom Possible cause How to put it right Reference
The sewing
machine does
not work.
The machine is not plugged in. Plug the machine in. page 9
The main power switch is turned off. Turn on the main power switch. page 9
The bobbin winder shaft is pushed to
the right.
Move the bobbin winder shaft to the
left.
page 12, 13
You have not used the foot control-
ler properly.
Use the foot controller properly. page 10
The needle
breaks.
The needle is not fitted properly. Fit the needle properly. page 21
The needle clamp screw is loose.
Use the screwdriver to firmly tighten
the screw.
page 22
The needle is bent or blunt. Replace the needle. page 21
You have not used the right combi-
nation of fabric, thread and needle.
Choose a thread and needle that are
appropriate for the type of fabric.
page 20
The presser foot you are using is not
appropriate for the type of stitch that
you want to sew.
Attach the presser foot that is correct
for the type of stitch that you want to
sew.
page 52
The upper thread tension is too tight. Loosen the upper thread tension. page 29
You are pulling the fabric too much. Lightly guide the fabric. –
The area around the hole in the nee-
dle plate is scratched.
Replace the needle plate.
Contact your retailer or the nearest
authorized service center.
–
The area around the hole in the
presser foot is scratched.
Replace the presser foot.
Contact your retailer or the nearest
authorized service center.
–
The bobbin case is scratched.
Replace the bobbin case.
Contact your retailer or the nearest
authorized service center.
–
You have not used a bobbin that has
been designed for this machine.
Incorrect bobbins will not work
properly. Only use a bobbin that has
been designed for this machine.
page 11
The upper
thread breaks.
You have not threaded the upper
thread properly. (for example, you
have not fitted the spool properly, or
the thread has come out of the guide
above the needle.)
Correct the upper threading. page 16
There are knots or tangles in the
thread.
Remove any knots or tangles. –
The needle is not appropriate for the
thread you are using.
Choose a needle that is appropriate
for the type of stitch.
page 20
The upper thread tension is too tight. Loosen the upper thread tension. page 29
The thread is tangled, for example,
in the bobbin case.
Remove the tangle thread. If the
thread is tangled in the bobbin case,
clean the bobbin case.
page 57
The needle is bent or blunt. Replace the needle. page 21