Belt keeps slipping off on my new Janome model 525B.

SOURCE: pfaff 1222 belt

Hi - a few suggestions:

1. May just need a good thorough service - generally a good idea to have it completely gone over - by an experienced Pfaff tech - every year or 2. Internal parts can dry out and simply get jammed.
2. The timing could be off - again an experienced tech can take care of.
3. The cam-stack (the part that actually makes your stitch formations) may have cracked. At the age of your machine, this isn't uncommon.

At the age of your machine, many other owners actually have it "rebuilt" by an authorized Pfaff service person. This model is one of those that's worth the investment compared to buying a new machine of the same caliber/quality.

If you are comfortable removing the top cover, you may be able to look at the internal parts to see if anything is broken. This will at least give you an idea of what may be happening.

Many authorized techs will not charge you to look at the machine and give you a quote. We'd suggest calling a few sewing machine stores in your area. Don't hesitate to ask friends for their recommendation of a good service person.

Hope this helps - please don't hesitate to respond if you need further info or clarification.

Happy sewing,
Kim & Linnette

SOURCE: My Brother Embroidery machine is

I would take it to a mechanic.

SOURCE: I'm in need of a belt for my Necchi Model M512548

You can purchase that Necchi belt here:

http://www.sewingpartsdirect.com/12-5-8-universal-sewing-machine-lug-belt.aspx

SOURCE: Hand Wheel Won't Turn

The "Bobbin stopper" is in the incorrect position. It moves from side to side in a switch like motion. In one direction, it locks up the machine. That is, you can turn the wheele backwards, but not forward.. The bobbin stopper can be found in the book that cam with the machine. In our book, it is item #9.

SOURCE: janome mylock 634D overlocker

this very same thing happened to my flat machine turned out to be a piec of material jammed in the workings also wrong oil used or it might be thread jammed try and see