You should have your sewing machine professionally serviced at least once a year. If you are using it fairly heavily, you should have it serviced more frequently.

You should read your owner's manual and learn to clean and oil between projects. For best results, replace needles frequently as well.

Never blow into your machine to remove lint. The moisture droplets in your breath can cause damage to the electronics and machinery. Also be careful with canned air. You can actually force lint and dust into the machine where only a service technician can get it out.
Source(s):
http://www.threadsmagazine.com/item/4731/preventive-sewing-machine-maintena...

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I quilt almost daily and I have mine tuned once a year for heavy use.
Find a REAL sewing machine shop, not a vacuum repair that is not knowledgeable in different sewing machines. Ask if they carry parts of your brand. That will be your cue, if they have to order go elsewhere.
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