Brother NX-450, N5V operation manual Troubleshooting

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Symptom	Probable Cause	Remedy	Reference
	The upper thread was not threaded
	correctly (for example, the spool is
	not installed correctly, the spool cap	Correct the upper threading.	page 28
	is too big for the spool being used, or
	the thread has come out of the
	needle bar thread guide).
	There are knots or tangles in the	Remove any knots or tangles.	–
	thread.
	The selected needle is not	Select a needle that is appropriate
	appropriate for the thread being		page 38
		for the type of thread being used.
	used.
	The upper thread tension is too tight.	Loosen the upper thread tension.	page 57
	The thread is tangled, for example, in	Remove the tangle thread. If the
		thread is tangled in the bobbin	page 142
	the bobbin case.
		case, clean the race.
The upper thread
breaks.	The needle is bent or blunt.	Replace the needle.	page 39
	The needle is incorrectly installed.	Correctly install the needle.		4
	The area around the hole in the	Replace the needle plate. Contact
	needle plate is scratched, or has a	your dealer or the nearest	–
	burr on it.	authorized service center.
	The area around the hole in the	Replace the presser foot. Contact
	presser foot is scratched, or has a	your dealer or the nearest	–
	burr on it.	authorized service center.
	The bobbin case is scratched, or has	Replace the bobbin case. Contact
		your dealer or the nearest	–
	a burr on it.
		authorized service center.
	A bobbin designed specifically for	Incorrect bobbins will not work
		properly. Only use a bobbin	page 22
	this machine is not used.	designed specifically for this
		machine.
	The bobbin thread is incorrectly	Correctly install the bobbin	page 26
	installed.	thread.
	The bobbin is scratched or does not	Replace the bobbin.	–
	rotate smoothly, or has a burr on it.
The lower thread is
	The thread is tangled.	Remove the tangled thread and	page 142
tangled or breaks.
		clean the race.
		Incorrect bobbins will not work
	A bobbin designed specifically for	properly. Only use a bobbin	page 22
	this machine is not used.	designed specifically for this
		machine.

Troubleshooting 145