Brother CS-770 Stitches are, Skipped, There is a high, Pitched noise While sewing, Be used

Symptom	Possible cause			How to put it right	Reference
	You have not threaded the upper	Correct the upper threading.			page 16
	thread properly.
	You have not used the right combi-	Choose a thread and needle that are			page 20
	nation of fabric, thread and needle.	appropriate for the type of fabric.
Stitches are
	The needle is bent or blunt.	Replace the needle.
skipped.
					page 21
	You have not inserted the needle	Insert the needle properly.
	properly.
	Dust has accumulated under the	Remove the needle plate cover and			page 57
	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 57
	in the bobbin case.
	You have not threaded the upper	Correct the upper threading.			page 16
	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 bobbin that has	Incorrect bobbins will not work
		properly. Only use a bobbin that has			page 11
	been designed for this machine.
		been designed for this machine.
		Raise the needle either by turning the
		handwheel toward you
The needle	You have not moved the needle	(counterclockwise) so that the mark			page 16
	holder to its highest position.	on the wheel points up or by pressing
threader can not			(needle position button) once or
be used.
		twice.
	You have not inserted the needle	Insert the needle properly.			page 21
	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			page 52
	not correct for the type of stitch.
		sew.
The stitch is not	The thread tension is incorrect.	Adjust the tension of the upper			page 29
sewn correctly.		thread.
	The thread is tangled, for example,	Remove the tangle thread. If the
		thread is tangled in the bobbin case,			page 57
	in the bobbin case.
		clean the bobbin case.
	The feed dogs are lowered.	Slide the feed dog position lever to			page 38, 45
				.
	The stitch is too fine.	Lengthen the stitch length.			page 27
The fabric does
	You have not used the right combi-	Choose a thread and needle that are			page 20
not feed.
	nation of fabric, thread and needle.	appropriate for the type of fabric.
	The thread is tangled, for example,	Remove the tangle thread. If the
		thread is tangled in the bobbin case,			page 57
	in the bobbin case.
		clean the bobbin case.
The sewing light		Contact your retailer or the nearest
bulb does not	The sewing lamp is damaged.				–
		authorized service center.
come on.

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