Brother XL-3750 Stitches are, Skipped, There is a high, Pitched noise While sewing, Be used

APPENDIX / ANEXO	—————————————————————————————————————————————————
Symptom	Possible cause	How to put it right	Reference
	You have not threaded the upper	Correct the upper threading.	page 32
	thread properly.
	You have not used the right combi-	Choose a thread and needle that are	page 39
	nation of fabric, thread and needle.	appropriate for the type of fabric.
Stitches are
	The needle is bent or blunt.	Replace the needle.	page 16
skipped.
	You have not inserted the needle	Insert the needle properly.	page 16
	properly.
	Dust has accumulated under the	Remove the needle plate cover and	page 70
	needle plate or in the bobbin case.	clean the plate and the bobbin case.
	Dust has built up in the feed dogs or	Clean the bobbin case.	page 70
	in the bobbin case.
	You have not threaded the upper	Correct the upper threading.	page 32
	thread properly.
There is a high-
		Replace the bobbin case.
pitched noise			–
while sewing.	The bobbin case is scratched.	Contact your retailer or the nearest
		authorized service center.
	You have not used a bobbin that has	Incorrect bobbins will not work
		properly. Only use a bobbin that has	page 26
	been designed for this machine.
		been designed for this machine.
	You have not moved the needle	Turn the handwheel toward you
The needle		(counterclockwise) to raise the nee-	page 34
	holder to its highest position.
		dle holder to the highest position.
threader can not
be used.	You have not inserted the needle	Insert the needle properly.	page 17
	properly.
	The presser foot that you are using is	Attach the presser foot that is correct	–
		for the type of stitch that you want to
	not correct for the type of stitch.
		sew.
The stitch is not	The thread tension is incorrect.	Adjust the tension of the upper	page 38
sewn correctly.		thread.
		Remove the tangled thread. If the
	The thread is tangled.	thread is tangled in the bobbin case,	page 70
		clean the bobbin case.
	The stitch is too fine.	Lengthen the stitch length.	–
	The darning plate is fitted on the	Remove the darning plate.	–
	needle plate.
The fabric does	You have not used the right combi-	Choose a thread and needle that are	page 39
not feed.	nation of fabric, thread and needle.	appropriate for the type of fabric.
		Remove the tangled thread. If the
	The thread is tangled.	thread is tangled in the bobbin case,	page 70
		clean the bobbin case.
The sewing light
bulb does not	The sewing light bulb is damaged.	Replace the sewing light bulb.	page 69
come on.

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