The needle is not going up and down correctly. some times up all the way and other time it will go down and stay down not going up all the way. Getting the Press mark picture but pressing the mark doesn't' release the issue. I turn the machine off to remove the picture and sew, rattling and not going up and down properly.
SOURCE: needle jaming and thread gathering under bobin case
when this happens to me (the needle breaking) I make it a thing to do and that is to use a qtip with a bit of oil and clean the bobbin holder and then use canned air and blow out the lint from area and this may help you. You may have a tiny tiny piece of needle left in the holder and this will play havoc with any kind of sewing machine. I have suffered through it many times before I made this a practice when needle breaks
SOURCE: needle wont go up and down.
well,it seem that your upper camshaft was stuck due to several factor on mechanical linkages and maybe on gears.You have to isolate the checking since you have clean lower bobbins free from dirt and thread/fabrics chips.If there an opening on top of machine open it to check some mechanical destorsion or breakage.Check some broken gears inside.If nothing try to open also at the bottom of machine cover and there are also belt and gears connected to the motors and bobbins shuttle holder if so oil all shafting oil port,oil port bushing specially on bushing near hand wheel there is port for oil,
check also motor assembly of machine,you can disconnect belt from motor release the bolt holding motor adjust to lower tension belt and release the belt.Take some tools such as monkey pliers or small pipe wrench that can hold hand wheel just crack in order to move suddenly after oiling for several hours sometime bushing and shafting rushes emerged or if you have anti rush spray put in on.After cracking and you can move a little crack only by your hand several time lleft and right until all linkages free from rush.If you can move all parts and hand wheel rotate freely.Check also motor by rotating the small pulley conncted to motor if free to move.if ok put back and reassembly all parts disconnected.try to move again by hand if free to move after all asssembly.Run machine using foot pedal.
SOURCE: janome mylock 634D overlocker
this very same thing happened to my flat machine turned out to be a piec of material jammed in the workings also wrong oil used or it might be thread jammed try and see
SOURCE: I have a janome 8050
The key to proper stitches is that tension on the bobbin must equal the tension on the upper thread spool as well. The bobbin has a tension screw that may have come loose or the thread is not properly in the tensioner. For example, the bobbin could be in backwards. Or the tension of the top could be too light and allowing the tension on the bottom to pull the thread down too much.
Open the bobbin tray and watch while you slowly rotate the hand control to see it make a stitch.
You will probably be able to figure out what is wrong.
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