Brother HE-800A ￿￿-￿.Uneven seams (2) …… Lower thread is lifted up at the sewing start, The end of the lower thread protrudes above the seam at the sewing start

16. TROUBLESHOOTING￿

￿

Cause	Check	Remedy	Page
Lower thread (bobbin	Lower thread tension	Adjust the lower thread tension appropriately.	61
slip)	Bobbin holder spring	Add tension to the bobbin holder spring.
		.
		Add tension to the spring by the same
		amount that the bobbin tab is projecting
		Make a gap	-
		4001Q
	Lower thread retainer	Adjust the lower thread retainer position.
	position	* Adjust lower thread retainer so that a 35 – 40 mm
		thread leader is left after trimming.
			-
		35 - 40mm
		4002Q
	Bobbin presser position	Adjust the bobbin presser position.	77
	Bobbin insertion	Insert the bobbin correctly.	60
	Work clamp lifting speed	Reduce the setting for memory switch No. 02.
			79

￿￿-￿. Uneven seams (2) …… Lower thread is lifted up at the sewing startThe end of the lower thread protrudes above the seam at the sewing start

Cause			Check		Remedy	Page
Lower	thread	Lower	thread	retaining	Adjust the lower thread retaining amount.
retainer		amount
						-
					4003Q
Lower thread clamp		Lower	thread	clamp	Adjust so that the lower thread clamp plate opens	77
		opening timing			when the feed mechanism moves 6 – 7 mm.
		Lower	thread	clamping	￿If the lower thread clamp and lower thread presser
		force			are bent, replace them.
					￿Check that the screws are tightened.
					Screw
						-

Lower thread clamp

3999Q

95 HE-800A