My problem is ,i do not know how to read it properly
Try this link and contact them, see if they can help you
http://www.weiku.com/Packaging-Machinery/buy-DU-4410L-4420L-WALKING-FOOT-MACHINE.html
SOURCE: Bernina Bernette 65 sewing machine
Presumably neither of you has or knows how to adjust your bobbin tension so, I'm going to presume it's your hook. Make sure you are threading the machine coorectly then you'll need to remove your needle plate by removing the two screws, pull out your hook (this is the part your bobbin sits in) but make sure you note which way it sits inside your machine. Have a look at the plastic hook for any sharp edges or burs, you may need to replace your hook or try and gently sand (400grit) the plastic if possible. The key part of the hook is the small blunted point as this is what catched the loop of thread behind the needle. Please make sure that when you put your hook back in, that it is on the left side of that little guard sticking out on the lower right of your machine.
SOURCE: Brother DB2-B755-3 industrial sewing machine
I have the manual in pdf form here
http://myweb.tiscali.co.uk/stitches/BROTHER-DB2-B755-MKIII-MANUAL.pdf
SOURCE: MANUAL FOR BROTHER INDUSTRIAL SEWING MACHINE DB2-B755-3
Go to brother.com . From there you will need to enter the model number and serial number to get the file for free good luck
SOURCE: help me find a manual for a euro pro 7133 sewing machine
I hope this helps. It took some searching but this is what i found. Good luck!
http://www.sharkclean.com/manual/7133_REV_1204_ENG-SP-FR.pdf
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