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Old 09-22-2016, 11:06 AM
  #6  
Prism99
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Join Date: Dec 2008
Location: Western Wisconsin
Posts: 12,930
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Originally Posted by NZquilter
I have a fully metal machine, with no computer parts in it. I don't think it can reset itself, but can the timing still be off, and if so, how do I fix it? I have a Singer 4423. Thank you for your help!
Yes, the timing can be off. Timing refers to the exact interaction between the needle and bobbin threads. Some machines are more sensitive to trauma than others but, in general, timing can be thrown off on any machine when a needle breaks while sewing or when there is a big thread jam.

Before taking it in for maintenance, I would check and re-check the new needle. It is quite common to insert a needle and not push it *all* the way up on the shaft. This often causes a timing problem. Also, try a needle from a different package (occasionally a bad batch of needles isn't caught at the factory) and/or a different size and type of needle. For example, if you have been using a microtex needle try a topstitch needle. If you have been using a size 80 needle, try a size 90. Needle type and size can subtly alter timing, so changing the type and/or size of needle might be enough to offset whatever timing problem might have been created by hitting the basting pin.

Last resort is to take it to a technician to re-time. I think there are a few Youtube videos that show how to re-time, but most of us would not be able to do it -- especially if the machine is different from whatever is on the video.

Also, use a magnifying glass in the bobbin area to see if you can spot any tiny piece of thread or lint that might be interfering with timing. Depending on your machine, you might be able to use unwaxed dental floss to "floss" between the upper tension discs (do this with needle up, as needle down closes the tension discs). This is a longshot, but also a possibility.
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