Brother DH4-B980 Troubleshooting, Machine Head, Problem, Cause, Remedy, Page, Thread breaks

11. TROUBLESHOOTING

11. TROUBLESHOOTING

If there is a problem with operation, first check that the threads are correctly threaded and that the needle is correctly installed.

CAUTION

Turn off the power switch and disconnect the power cord before carrying out troubleshooting, otherwise the machine will operate if the start switch is pressed by mistake, which could result in injury.

MACHINE HEAD

Problem		Cause			Remedy	Page
Thread breaks.	Thread	tension	control	nut	Adjust to an appropriate pressure.	32
	pressure is too strong.
	Thread is of poor quality.				Use a better-quality thread.
	Thread is too thick for the needle.				Use a differently-size needle.
	Needle groove or needle hole are				Replace with a new needle.	16
	not smooth.
	Needle and looper adjustment is				Adjust the needle bar height or	43
	incorrect.				the looper and spreader height.
	Needle, looper, throat plate or				Repair the damage with an
					oilstone or buffer, or replace the
	thread path is damaged.				damaged part.
Skipped stitches occur.	Thread	tension	control	nut
	pressure is too strong or too				Adjust to an appropriate pressure.	32
	weak.
	Needle point is broken or bent.				Replace with a new needle.	16
	Needle and looper adjustment is				Adjust correctly.	44
	incorrect, or clearance is incorrect.
	Needle	and	needle	guard	Adjust correctly.	47
	adjustment is incorrect.
	Looper tip is blunt.				Repair with an oilstone or replace
					the looper with a new one.
Needle breaks.	Needle is bent.				Replace with a new needle.	16
	Needle and looper adjustment is				Adjust the needle bar height or	43
	incorrect.				the looper and spreader height.
	Needle	and	needle	guard	Adjust correctly.	47
	adjustment is incorrect.

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RH-9800