Brother HE-800A ￿￿-￿.Uneven seams (1) …… At the sewing start

￿								16. TROUBLESHOOTING
￿
Cause			Check			Remedy			Page
Thread tension		Zigzag	thread		upper	Adjust the upper thread tension appropriately.			62
		thread tension
Needle bar plate		Vertical	and longitudinal			Reduce the needle bar play, or replace the parts.			-
		needle bar play
Lower thread clamp		Lower	thread		retainer	Lower thread retainer cam should be sitting firmly
		cam				on lower thread clamp plate roller.
							Cam
							Roller		-
								3998Q
		Thread	scraps	and dust		Clean around the lower thread presser.
		blocking	area		around				-
		lower thread clamp and
		lower thread presser
		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
Needle plate		Relation			between	￿When using knit material, replace with the –3
		material and needle plate				needle plate.			-
						￿Replace with a needle plate with a smaller needle
						hole.
Joint sewing		Angle	of work		clamp	￿Replace with short work clamp that matches the
		means that material is not				sewing length.
		being clamped.				￿Use the accessory auxiliary sheet.			75
						￿Process the work clamp assembly to match the
						joint section. (Attach or remove rubber.)
￿￿-￿. Uneven seams (1) …… At the sewing start
Cause			Check			Remedy			Page
Upper	thread	Installation height				Adjust the upper thread scissors installation height.			75
scissors		Upper	thread		scissors	Adjust to an appropriate opening timing.			76
		opening timing
		Upper	thread		scissors	Apply grease to the inclined face of the opening			76
		operation				cam.
Upper thread feeding		Thread take-up amount				Loosen the screw to decrease thread take-up
						amount so that upper thread does not pull out of
						scissors assembly at the sewing start.
								Screw
						Decrease	Increase		-
								4000Q

HE-800A 94