Brother rh-918a manual Troubleshooting, Machine Head

13. TROUBLESHOOTING

13. 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	47
	pressure is too strong.					pressure.
	Thread is of poor quality.					Use a better-quality thread.
	Thread is too thick for the					Use a differently-size needle.
	needle.
	Needle groove or needle hole					Replace with a new needle.				28
	are not smooth.
	Needle and looper adjustment is					Adjust the needle bar height or				55
	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	Adjust	to	an	appropriate
	pressure is too strong or too					pressure.				47
	weak.
	Needle point is broken or bent.					Replace with a new needle.				28
	Needle and looper adjustment is
	incorrect,	or	clearance is			Adjust correctly.				56
	incorrect.
	Needle	and	needle		guard	Adjust correctly.				59
	adjustment is incorrect.
						Repair with an oilstone or
	Looper tip is blunt.					replace the looper with a new
						one.
Needle breaks.	Needle is bent.					Replace with a new needle.				28
	Needle and looper adjustment is					Adjust the needle bar height or				55
	incorrect.					the looper and spreader height.
	Needle	and	needle		guard	Adjust correctly.				59
	adjustment is incorrect.

RH-981A

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