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This happened to me on several occasions and finally one service tech told me not to use the needle down auto button. Instead when threading the bobbin just move the wheel toward you slowly until the thread catches.
Despite what the instruction book tells you, do not use the auto downup button to pick up the bobbin thread. Instead pull the wheel toward you and do it manually. Many times the bobbin thread gets caught and the machine halts if that auto down button is used.
if you have a manual the information should be in it, if you don't have a manual here is a link for a manual, but it's not free, http://www.sewingpartsonline.com/janome-7330-manual.aspx if you don't want to buy a manual,, then contact janome customer service and ask them if you can oil the sewing machine yourself or if it's a self oiling sewing machine..
If it is computerized, they are generally sealed so they cannot be opened by the user. There are computerized components that could easily be damaged. The manual should have instructions how to maintain your machine. AVOID using compressed air as it tends to push lint and dirt further into the machine where only a technician can clean.
The easiest solution would be to change your needle. They do wear out, get bent, etc, and that makes it difficult for them to pick up the bobbin thread.
If you did just change the needle, there was a hint here on FixYa about being sure to face the needle correctly. If you feel the needle, there will be a flat side and a curved side. Check your owner's manual to see which side should face which direction.
This sounds silly, but I have the same machine and it kept happening to me too. Here's what I was doing wrong: When I thread it between 6 (thread take-up lever) and 7 (lower thread guide), the thread was being left exposed on the face of the machine instead of falling into that little **** of a crevice. One I figured out to stick it in the **** of the crevice, all was well. Try that -- and good luck!
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