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Bernina 630 Machine is buzzing when I turn it on.What does that indicate??

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With regard to the question about the Bernina humming when it was turned on, mine was doing that today. I discovered that the lever on top where you place a bobbin to be wound was pushed over ever so slighty. When I pushed it back to the correct position the humming stopped! Hurray, no trip to the service place today.

Posted on Feb 17, 2015

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Posted on Jan 02, 2017

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chrismyers67
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SOURCE: Problem with Bernina 630

Sounds like one of your thread sensors is misaligned, covered in lint or broken, get a can of canned air and clean out your bobbin case area and you top tension area to ensure no lint/thread is blocking the sensors. If you still are having problems, find your local independent sewing store in your town that gives free estimates and see what they say.

-Hope that helps,
Chris

Posted on Jun 06, 2010

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SOURCE: I am considering buying a used Bernina 630 2006

These are lovely machines when properly looked-after and the usual advice applies - make sure you test the machine thoroughly before buying. I always test by threading different colours top and bottom to check the stitch formation - the top and bottom colours should remain top and bottom although a little bit of top underneath is not unacceptable. When you sew-off, make sure you check on a close full-width satin-stitch - the machine should be able to produce a good close zig-zag with 0.2mm stitch length and full 5.5mm width, without pulling th fabric through (you should never pull the fabric anyway, of course). Check thepattern balance by sewing-off a round buttonhole with a No1 foot - the circle should be perfect. You can also check balance using pattern number 437 (this is the pattern the factory uses) - the centre of the pattern should be exactly on the top of the triangular section. Make sure you check that the auto buttonhole functions properly with the 3A buttonhole foot. If the stitch formation is inconsistent or the machine is a bit noisy, check whether its been cleaned by looking under the stitch plate and take out the bobbin case and hook/shuttle - dont be afraid to give the hook race a drop of oil - this usually quietens a machine that's not been adequately cleaned/oiled, but if its still noisy, be a bit careful. Make sure sensors such as the upper thread sensor is working by just cutting the upper thread whilst sewing-off. If the machine fails to detect thread breakage and is a bit noisy, there might be a minor issue with the sensor and it may have been disabled. I've not generally found any major issues with this range of machines, but be aware that the main boards are extremely expensive to replace if there is a problem with any of the interfaces, so check, check, check as much as you can before buying. Lastly, I have seen a small number of these machines that appear to have a minor problem that they occasionally 're-boot' themselves - if this happens whilst you're testing - avoid - it can be an expensive repair on a machine that is no longer under warranty. Mechanics are rarely a problem with these machines, but ask to see evidence of routine maintenance service - a machine that's 5 years old should have had at least a couple of proper services and more if used very regularly.

Good Luck with your purchase and I hope it turns-out to be a 'good-un' !

Posted on Nov 14, 2011

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