Service manual I was having problems with my feed dogs, so I took apart my Brother CS6000i to clean out all the fuzz from inside, which was a lot b/c I've been working with a lot of flannel lately. Put it back together, somehow I now have two screws leftover, and my needle keeps hitting the throat plate and breaking, but only when I put on a presser foot (any foot--runs fine on multiple stitches w/o one on, weirdly). I think that b/c the screws are missing, something might be out of alignment. Need to see if anyone has a schematic or repair manual that tells me which screws go where upon reassembly, or has another explanation for why this might be happening. Thanks.

SOURCE: needle position

perhaps the needle is not in straight or is bent.

SOURCE: I took my maching apart to clean the lint out and

most likely the bobbin case is not aligned correctly .Insert the bobbin case so that the projection on the boobin case aligns with the spring.

SOURCE: I have a Brother CE4000. Bobbin carriage will not spin

It is a good idea to clean as you did. However, you must put the needle plate back on the machine first, then the bobbin case is inserted(more on that) then the "L" shaped gray cover. Make sure the b-case is laying level on the surface of the hook and the little bump at about 6 o'clock on the case is touching the spring at about 6 o'clock in the machine. Test a sample.

SOURCE: Presser foot problem

Turn the handwheel so the needle is at the highest position and then turn the power off and then back on.

If this does not help, you will need to take the machine in for service.

SOURCE: Brother CS6000i feed dogs issue :(.

sounds like something may have broke or come loose,, I'd take the machine to someone else to have it checked to see what the poping sound was