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Check the needle thread tension. If the tension is too tight, the needle will not be able to move up or down. To adjust the tension, turn the tension knob on the side of the machine. Turn the knob clockwise to increase the tension, and counterclockwise to decrease the tension.
Check the needle. Make sure that the needle is inserted correctly into the needle bar. The needle should be inserted all the way up to the flat spot on the needle bar. If the needle is not inserted correctly, it will not be able to move up or down.
It sounds like a professional embroidery machine. One of the linkages has come loose. They are timed by small set screws in the knuckles. When was it last serviced?
As far as I know, the Patchwork 140 doesn't have a needle stop up/down button. You'll need to use the hand wheel to bring the needle up or down, as needed. The Bernina machines that have a needle stop up/down button have this button below the LCD screen. (On those machines, it's usually the left-most button below the LCD.) I suspect the index giving a page number for the Needle Stop Up/Down button is a artifact of using the same index for multiple machines.
If you did not get the old needle out, it may be blocking something. That old needle must be removed before you attempt to any further sewing. Try removing the bobbin case from the machine and looking in there to see if you can locate and remove the old needle. Sometimes, I've had to turn the machine sideways or upside down and shake it to dislodge the needle.
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Open the bobbin area and hand rotate the handwheel while watching the needle action. If it is hitting, you should see it. If that is the case, the machine may be out of time and need service.
I just took a look at your user's manual (I recommend you go to the Singer site and download it--it's free), and on page 20, it says that the top button of the set of three buttons above the needle shaft is the needle up/down button. If you press it when the machine is NOT sewing, it will reset it to stopping with the needle UP instead of DOWN. In other words, it resets the needle's default position, but you must do that when it isn't sewing anything.
This could be the needle bar clutch. Turn off machine. Unplug machine. Remove needle. Turn hand wheel in normal rotation 1/4 turn. Gently move needle bar up and down by hand you should feel a click and the needle bar will not move up and down easily now. Restart machine and test. If it works all is good. This is a result of the machine requiring professional attention. If you use basting stitches it will likely unclutch again.
usually a 3-5 inch thread tail is helpful to keep the thread from coming out of the needle & pull the thread(top & bottom) behind the needle
flat side of needle goes to the back of machine
some needles & thread are not compatable----try this
Cut 6-8 inch piece of thread of the spool you are going to use for your project
Take the needle you are going to use for the project
& insert the thread thru the eye of the needle
& lift one end of the thread to a 45 degree angle
& if the needle is the right size for the thread it will slide down the thread
But if the needle hangs on the thread you need one size larger needle for the thread
on some machines the presser foot can't do a zig zag stitch
Look for an optical sensor that the needle mechanism blocks when down. It's a small plastic rectangular package with a slot through the middle that the needle blocks with a vane of some kind. This slot can pick up lint and dust which makes the machine think that the needle is down. Clean the slot with a vacuum and a fine needle. Hope this helps.
the up and down buttons are not working properly. When pressing the needle down button, the needle does go down and then comes right back up. pressing the needle up button makes the needle shoot up and down 2 times very fast. HELP
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