Singer H74 instruction manual Problem Cause Correction Reference

TROUBLE SHOOTING GUIDE

Problem	Cause		Correction				Reference
	1.The needle thread tension is too tight.	1.Loosen the thread tension.					Page 19
	2.The needle thread is not threaded	2.Rethread the machine.					Page 13
Seam	correctly.
puckering	3.The needle is too heavy for the fabric	3.Choose a needle to suit the thread and					Page 22
	being sewn.	fabric.
	4.Stitch length is too long for the fabric.	4.Shorten stitch length					Page 28
	1.The correct presser foot is not used.	1.Select the correct foot.					Page 77
Patterns are
	2.The needle thread tension is too tight.	2.Loosen the thread tension.					Page 19
distorted
	3.The stitch length is not suitable for the	3.Make a stitch adjustment and add					Page 28
	fabric being sewn.	stabilizer to the fabric.
The machine	1.Thread is caught in the hook.	Remove the upper thread and bobbin					Page 73
		case. Turn the handwheel backwards and
	2.The feed dogs are packed with lint.
jams		forwards by hand and remove the thread
		remnants.
	1.Lint or oil have collected on the hook or	1.Clean the hook and feed dog as					Page 73
	needle bar.	described.
	2.The needle is damaged.	2.Replace the needle.					Page 23
The machine
	3.Slight humming sound coming from	3.Normal.					--
is noisy	internal motor.
	4.Thread is caught in the hook.	Remove the upper thread and bobbin					Page 73
		case. Turn the handwheel backwards and
	5.The feed dogs are packed with lint.
		forwards by hand and remove the thread
		remnants.
	1.Poor quality thread.	1.Select a better quality thread.					Page 22
Uneven
	2.The bobbin case is threaded wrong.	2.Remove the bobbin case, the thread					Page 12
stitches,		and reinsert correctly.
uneven feed
	3.Fabric has been pulled.	3.Do not pull on the fabric while sewing,					--
		let it be taken up by the machine.
	1.The machine is not turned on.	1.Turn on the machine.					Page	9
	2.The Start/stop button was not pressed.	2.Press the Start/stop button.					Page 24
	3.The presser foot lever is raised.	3.Lower the presser foot lever.					Page 17
The sewing	4.The Start/stop button was pressed, even	4.Do	not use Start/stop button when			the	Page 24
	though the foot controller is connected.	foot	controller is	connected.	To	use
machine
		Start/stop button,		disconnect	the	foot
doesn't
		controller.
operate
	5.A thread is caught in the hook race.	5.Remove the upper thread and bobbin					Page 73
		case. Turn the handwheel backwards
		and forwards by hand and remove the
		thread remnants.
	6.The machine is not plugged in.	6.Connect the power line plug to the					Page	9
		electric outlet.

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