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There is a small plastic plate where the needle goes down through the foot, remove this cover and you will see the bobbin. Remove the bobbin and refill or selecting another bobbin turn it so that when you pull the thread the bobbin turns anti-clock-wise, slip the bobbin into the black plastic casing, pulling the thread towards the small red arrow at the bottom of the casing, slip the thread between break in the silver metal sleeve pulling it to your left between the 2 pieces of metal this is where the tension on the thread is. You have now changed your bobbin. With the plastic plate still off, hold the top thread with your left hand and with your right slowly turn the wheel, this will send the needle (holding your top thread) down into the bobbin casing and will pick up the bottom thread, pull on the top thread and bring the bottom thread up through the hole in the plate. Replace the plastic plate and recommence sewing. Good luck
If it's just blue thread, then chances are you've got a bad spool of thread. Try a different color of the same type. Otherwise, take the thread off the top of the machine, clean it according to the recommendations in the manual, then rethread from scratch, carefully, according to the manual. Bad needle, bad thread and threading problems are the most likely causes. The final set of likely causes is a burr or sharp spot on one of the eyes thread runs through, or on the needle's eye, or presser foot or needle plate (=throat plate). Burrs can be *gently* polished off with a piece of crocus cloth.
Could be motor brushes or a bad base plate board circuit board. That is a great machine but may be hard to find someone to fix this problem. Take to only to a pfaff repair shop. Motor brushes should be around $50-100 repair and base plate could be up to $500. I would also check it with a nother foot control just to be safe.
If your husband wants to do the job here are some tips.
The motor is right behind the display board, you will need to remove the diplay and motor to get to the brushes.
For the base plate board, Remove the 4 large flatblade screws to get the base plate off.
Right next to the trasnformer there 3 small fuses, (they are back and say fuse on them) if one is very carroded and white there is a good chance that is bad and replacing it will fix the probem.
Lots of work for bolth if the repairs and I recomend you take your machine in.
Servicing a sewing machine is litteraly making sure it is fluff free round the bobbin case area and all moving parts oils lightly with WD40, before spending out large amounts of money I would try that first because that is all the shop is going to do, if you have a major problem then a shop repair may be needed, try www.sewingonline.co.uk/manuals or www.tandtrepair.com for manuals.
first question, when the needle is all the way up are the feeddogs above the needle plate? second, are both the upper and lower thread in there tensioners? Third do you have the feed set at a stitch length? Only things to look at, if the feeddogs are not above the plate when the needle is in its highest postion then it needs to go to your local dealer to be adjusted, if the thread is in the tensioners and the tensions look good back to the first but if they look bad, again take it to your local dealer. If the stitch length happened to get bumped and is at 0 then it just needs to be turned to a length.