Fix for Janome error E9

SOURCE: kenmore 12 stitch sewing machine-wont sew

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SOURCE: janome 8080 computerized sewing machine

Is the bobbin the correct size? if you have spare bobbins do they all have the same problem?

SOURCE: Loose stitching underneath. HOW CAN I FIX!!!!

Sounds as though you may have a burr or rough spot on the hook where the bobbin inserts. Run your finger along the edge of the hook to see if there are any rough spots.I'm sure you're going to find at least one from the time you broke the needle.Once you locate it, remove it with an emery stick or small sharpening stone. Polish it so that it is smooth. Should work okay.
sewman7

SOURCE: I have a Necchi 537FA sewing machine. It sill sew

have you checked to see if the needle is bent-lay the needle on a flat surface & roll the needle over,, if the needle does not roll good -replace
blunt needle-if the needle makes a popping sound when the needle penetrates the fabric,,the needle is blunt-replace
sometimes if the thread comes off the thread take-up lever it can jam the thread in the bobbin area
try rethreading the machine
check to make sure the thread isn't wrapping around the spool pin
check the spool of thread to see if the notch on the spool is catching the top thread
check to see if there's a burr on the bobbin case
I hope one of these suggestions helps you
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SOURCE: Bernina 820 Tension Error Message

You need to take your machine in for service. The 8 series machines have new upper tension parts that can be installed under manufacturer warranty and MAKE SURE your Bernina dealer is well trained on the 820 and 830 or they'll never get it adjusted right. The 8 series are just all around buggars when they're out of whack.