Candace, while not familiar with the 4.2, I've had thread jams on my trusty old Pfaff. I hope this helps!
If you are able to totally remove the bobbin cover/stitch plate, please do so. Ideally, there will be one or two screws holding it in place.
remove the bobbin
carefully inspect the bobbin housing; thread likes to hide behind the housing. If you find some thread, use a tweezers to remove it.
If no thread is found, see if there are one or two screws holding the bobbin holder/raceway in place, or just a lever. Try to remove the bobbin holder, carefully noting what the orientation is of all pieces is (using a cellphone to capture pictures of before and after is great!).
Clear any threads from the raceway, carefully re-assemble everything, test and good luck!!!
SOURCE: Threads knotted under the plate in the feed dogs.
Some sergers have a threading guide inside the door on the front of the machine.
If you need a manual, please provide the brand & model.
SOURCE: My Pfaff expressions 4.0 says Remove thread jam
Open the needle plate and check this area for an obstruction.
Refer to the manual for how to clean this area so you get everything back in place.
SOURCE: Sewing machine not stitching
Sounds like you need to retime the machine, if you email me I can attach instructions [email protected]
SOURCE: Pfaff quilt expressions 4.0 shows
A lot of these Ex 4.0 have defective cutter motors. The arm that the cutter is attached to passes by a sensor that tells the machine when the cutter is at the rest position. And what is happening is that the arm is no longer in place to tell the sensor where it is, and it stops short of the rest position. This part is covered by PFAFF for a 5 year period. You'll just have to have a PFAFF dealer install it and pay a labor charge.
SOURCE: Message remove thread jam under the stitch plate keeps appearing! It's clean!
After cleaning out the bobbin area, re-threading the top thread, turning my Pfaff 4.2 off and on it still said " remove thread jam under the the stitch plate". I pushed the "ok" button and it started working again.
Keeping my fingers crossed.
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