I suspect the bobbin thread has escaped its tension spring. If you give the bobbin thread a quick short tug and the bobbin spool spins then likely the thread is not behind the tension spring. This usually causes hook jam but not always.
First be sure you have threaded per machine instructions... see below.
Next turn handwheel and position needle at the high point of stroke (always when loading bobbin). Remove and re-insert bobbin. Now, to be sure the bobbin thread is fully positioned behind the tension spring, before you move the bobbin thread into the notch, place your right index finger on top of the bobbin spool to prevent the bobbin spool from turning. Hold thread snugly (in slight tension) as you move it towards the back of the notch. You should feel the thread slide in place behind the spring. Let loose the spool and lightly pull thread. Note the resulting change in tension. (don't forget to set top thread tension back to a more normal setting)
Comment here if you require further assistance.
If you need... your manual may be downloaded at no charge from the Janome site.
https://www.janome.com/siteassets/support/manuals/embroidery-models/inst-book-mc350e.pdf
SOURCE: Janome Memor Craft 10001 bobbin tension
Hi, There is an adjustment on the side of the black bobbin case. Remove the needle plate, to gain access to the case. Lift it out, noting how it is positioned! On the side of it , there are two screws, one is the adjustment screw - its the one that sits out more. To increase tension, turn it clockwise 1/8th of a turn, reassemble and test sew. (make sure the top thread tension is back to where it should be). Repeat if required. DO NOT adjust too much at a time! Good luck
SOURCE: loose stitches every 1
test it out on 2 pieces of material by rotating the wheele by hand. pay close attention to the 1" area. when you turn it by hand you can feel the area of question. is your bobbin spooled correctly. if all fails read the directions.
I’m happy to assist further over the phone at https://www.6ya.com/expert/james_1cb31da1bc8c6102
SOURCE: Janome Memory Craft 4900 QC
its the sensor on the bobinwinder who are loose. If you are handy. you can remove the top cover of the machine.
And on the left side of the bobinwinder you will find a micro switch. Probably you have to tighten the screw on it..
SOURCE: I have a Janome Memory Craft 3000 sewing machine.
Good day!!!
please apply a some oil on the motor and other moving parts inside you sewing machine..
After
that reboot the machine and used it....first try is persisted but when
you used it continuously for at least 10 minutes your machine is OK...
SOURCE: Hi I have a janome
Yes you can adjust the bobbin thread. Take your bobbin case out, look for the little red dot on top of case--under that is a small screw--get a very small screwdriver and adjust----CAREFUL-IT JUST TAKES A VERY, VERY SMALL TURN--JUST REMEMBER---"righty- tighty--leftty -loosey". Just remember how you turn it--if the tension need tightened, turn it slightly to the right and if you need to loosen the tension--turn it slightly to the left. I hope this works for you.
Hi,
You don't have much info here to go on. I take it that it embroiders fine otherwise, ie on the built in designs. Is it a Janome card? Does it do it on a particular card / design? Have you changed the bobbin thread that you use? Check the top tension - even though it is 'automatic', it does require adjustment at times. Have you changed / using stabiliser that you use? Is the bobbin correctly threaded?
Check these things
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