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Re: My viking 990 sewing machine just stop running can...
It may need a new board or a new transformer. those are the two possible items that usually cause that. It could be a motor but I dont ever see that. It could also be if you wiggle where the cord goes inif it works, there a broken solder connection on the transformer board (repairable witha soldering gun) and fixable.
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Most Viking dealers or repair shops should be able to get parts for you. Some that I know of that are available online are: http://www.sewingpartsonline.com/viking-990-sewing-machine-parts.aspx
Ron Anderson at A1 sewing is someone I've known for about 20 years on the net... he's always been helpful to DIYers on the usenet group "alt.sewing", and has a good reputation as a source of parts: email@example.com -- I'd try him if you don't have a good local repair shop.
IIRC, the 990 is electronic, and you may not be able to find boards for it anymore.
And FWIW, I mostly sew on a Juki F-600; like the old Vikings, it just works.
You could have an electronic problem on the main printed circuit board or in the feed length stepper motor. You may also just have a bound section in the feed mechanism. I don't think there is a cure all answer for this problem. A 1/2 second hesitation between depressing the foot control and motor response is very common in these machines If your husband lubricated the bushings on the upper and lower shafts of your 990 I recommend that you have him remove all of the lubricant possible and keep your fingers crossed. The 990 is a self-lubricating machine and applying machine oil to these bushing will probably cause them to seize. The 990 should never be lubricated in many of the places you would lubricate many machines. Hopefully, you haven't done irreparable damage.
Impossible to explain how to time a sewing machine you need to be shown. Basically it entails setting the needle depth then making sure the hook passes just above the eye of the needle at a set height as the needle is rising, this ensures the hook catches the upper thread. Also the hook needs to be set a specific distance from the needle. Sounds easy but sometimes it can be very difficult and fiddly job.