Neddle hits bobbin case while sewing zig-zag stitch on Pfaff 7570

SOURCE: I need service manual for pfaff 7570

also need this manual
TIA
sarah

SOURCE: Needle hits bobbin outer casing

Your hook/needle timing is off and it needs to be seen by a technician before you damage the hook. Some dealers can do a 24 hour repair for an additional charge.
sewman7

SOURCE: Pfaff 7570 connection to new XP laptop

In this FAQ list (from PFAFF web) you find 100 times the same question and answer:
H402 My new computer does not have any serial COM ports, so how does it communicate with my Pfaff creative 7570?

You will need to obtain a USB Serial Adapter, which adds a serial port to your computer by plugging it into a USB port. Suitable adapters can be obtained from Belkin [http://www.belkin.com] and Keyspan [http://www.keyspan.com].
The following USB Serial Adapters are known to work with the Pfaff creative 7570:
• Belkin F5U103
• Keyspan USA-19QW
Please note that the Belkin F5U109 is listed as working with the Pfaff creative 2140/2144 (FAQ #H405), but it does not work the Pfaff creative 7570.

SOURCE: no communication between pfaff 7570 and computer

It sounds like you have it configured properly if you have the little machine and computer appearing on the display screen. I had this problem too in the beginning, file assistant doesn't use the files for the 7570 its only for some of the newer machines, use Vip customize to send the design to the machine from the file drop down menu. Hope this helps.

SOURCE: thread or bobbin tension

Thread tension. Beware of adjusting the bobbin screw. Pfaffs maintain their tensions just fine without adjusting the bobbin tension, unless you're using some crazy thick or fine thread. If you must change your bobbin tension, you would be well-advised to buy an extra bobbin case, because re-calibrating your tensions after changing them can be less than fun.

Increase your top tension, and your looping should cease. I normally keep my tension around 4.5. Also make sure you're using a good quality thread, and that there's nothing in the upper tension assemblies. Sometimes a tiny piece of debris can keep the top tension from applying enough tension, so turning the machine off and blowing some canned air in there can help as well.

Good luck,

-R