Brother PR-620 operation manual 202, Area, Upper or middle thread guide

APPENDIX —————————————————————————————————————————————————————

Symptom Probable Cause Remedy Reference Page

Sliding surface on hook is not smooth. There are burns on it.

1
		Consult your nearest authorized
		dealer.
	1 Hook race area
	The thread is loose in the hook	Remove the loose thread. If the
		thread is tangled in the hook,	p.193
	area.
		clean the hook.
	The play between the hook and	Consult your nearest authorized
	the race is too much.	dealer.
	The hook does not rotate	Remove lint, and clean and	p.193, 196
	smoothly.	apply oil.
	The space between the hook	Consult your nearest authorized
	stopper and the hook cannot be
		dealer.
	adjusted.
	The upper thread is not threaded
	correctly.
		Pull the upper thread by hand
		from below the presser foot, and
		check that the thread moves
		smoothly. If the thread does not
The upper thread		move smoothly, it is not
		correctly threaded.	p.35-38
breaks.
		Un-thread the machine and
		re-thread the machine.
		Make sure the thread is correctly
		positioned in the needle bar
		thread guide.
	Upper thread is not positioned	Make sure thread passes
		completely under upper and	p.36-37
	in upper or middle thread guide.
		middle thread guide.
	There are knots or tangles in the	Remove any knots or tangles.
	thread.
	The upper thread tension is too	Decrease the upper thread	p.86
	high.	tension.
	The lower thread tension is
	incorrect.	Adjust the lower thread tension.	p.85
	The thread does not roll out of
	the bobbin case smoothly.
	The bobbin case is damaged.	Replace the bobbin case with a	p.15
		new one.
		Check that the bobbin is wound
		so that it about 80% full and that
	The bobbin thread is not wound	the thread is evenly wound. If
		the bobbin is not correctly	p.15
	correctly.
		wound, replace the bobbin with
		one that is correctly wound or
		rewind the bobbin.
	A bobbin designed specifically	Use the correct bobbin.	p.15
	for this machine is not used.

202