Brother manual 142

6. TROUBLESHOOTING

Problem			Cause			Remedy			Ref.
Upper thread is		not							P.118
trimmed.			Movable knife is blunt.	Replace the movable knife.					-
									P.120
									P.118
			Fixed knife is blunt.	Sharpen or replace the fixed knife.					-
									P.120
				Adjust	the	position	of the	shuttle	P.102
			Movable knife does not pick up the	race thread guide. (except KE-484C)
			thread.	Adjust the needle bar lift amount.					P.100
			The movable knife does not pick up	Refer to “Skipped stitches occur”.					P.134
			the thread because of skipped
			stitches at the sewing end.
			Movable knife position is incorrect.	Adjust the position of the movable					P.116
				knife.					P.117
			Sub-tension is too weak.	Turn the sub-tension nut to adjust					Instruction
				the tension.					manual
Thread jamming.			Thread take-up spring tension and	Adjust the tension and height of the					P.5
			height are incorrect.	thread take-up spring.
			Incorrect needle and rotary hook	Adjust the needle bar lift amount.					P.100
			timing.
			Shuttle race thread guide is not	Adjust the position of the shuttle
			separating the threads. (except						P.102
			KE-484C)	race thread guide.
Poor seam finish on			Shuttle race thread guide is	Adjust the position of the shuttle					P.102
reverse	side	of	separating the threads insufficiently.	race thread guide.
material.			(except KE-484C)
			Upper thread is not properly tight.	Adjust the upper thread tension.					P.5
			Uneven needle thread.	Adjust the sub-tension.					Instruction
									manual
			Needle thread is too long.	Adjust	the	thread	take-up	lever	P.114
				stroke.					P.115
			Needle is striking the button (438)	Refer to “6. CHECKING THE SEWING					Instruction
				PATTERN” in the Instruction Manual.					manual
Incorrect	thread		Upper thread tension is too weak.	Adjust the upper thread tension.					P.5
tightness.
			Lower thread tension is too weak.	Adjust the lower thread tension.					P.5
			Thread take-up spring tension and	Adjust the tension and height of the					P.5
			height are incorrect.	thread take-up spring.
Machine	does	not		Check if the head position switch					Instruction
operate when power				cord is disconnected.					manual
is turned on and foot
				Adjust the position of the switching
switch is depressed.			Head position switch does not work.						P.130
				plate.
				Replace the head position switch if
				it is broken.
Inner clamping device				Adjust the work clamp pressure so
does not operate.			Work clamp pressure is too strong.	that the inner clamping device					P.132
(434, 435, 436)				operates.

135 KE-430B, 430C series