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Most likely because your machine has not been serviced (oiled & cleaned) in a long time and the old oil has turned to glue and seized. This is probably the most common problem with mechanical sewing machines. A mechanical sewing machine should be regularly maintained..ie every 40 hours of sewing use or at least every six months when not in use. You may want to take it to a Bernina service technician. Ask for a bottle of Bernina oil for CB hook machines and ask if they will show you how to oil it.
Please be advised that the newer machines (Classic models) such as the 130-180 and up, have a totally different geometry. This is to say that the older machines have a shorter distance from the center of the presser bar to the needle center. The newer machine design was increased to provide space for needle threaders etc. Older machines will use an older Walking foot model (still available).
it's very possible that the machine is slightly out of time & needs to be service at a sewing machine shop is the fabric & thread & needle compatable with each other? did you use every thread guide when threading the machine? is the bobbin in correctly? is the bobbin warped?
Is your machine fitted with a knee-lifter ? If so, its possible the knee-lift mechanism has got stuck, which will prevent the foot from coming all the way down. It's also possible that the foot lifter bar has slipped which will require re-setting. When the foot is lifted and the feed-dogs are dropped, there should be a clearance of about 7.5mm between the underside of the foot and the stitch plate.
Could be almost anything ! Do the usual simple checks - fuse in the mains plug (should be 3A), have you got another piece of equipment (radio etc.) that uses the same 2-pin plug for power - use it to check that the mains cable is OK. If the mains cable is OK, it maight be the switch on the power supply module or the power supply module itself ('L'-print), but could be more ... check if the sewing light or display backlight is coming on, but if completely dead, your only solution is to get it checked-out by a Bernina service agent.
Lets start at square-one. Have you checked the plug fuse ? Have you checked that the 2-pin mains plug is firmly inserted into the socket on the back of the machine ? If yes to the above ... are there any lights on at all ... sewing light, display backlight ? If it's completely dead, it's most likely the power supply 'L'-print which is a separate module screwed into the back of the machine below the spool holders. Your best bet is to get the machine checked-out by a Bernina service agent.
Likely the problem is a blown fuse in the S-Print (power supply).
You must have a grounding wrist strap when working with a Bernina Activa. They are extremely sensitive and can easily destroy the main circuit board if you don't use a wrist strap. You can get one at Radio Shack for less than $5.
The power supply is the square 1/3 of the machine on the back on the handwheel side.
You can remove the power supply by removing the long torx screw on the rear of the machine and tilting out enough to unplug the connector.
Then dismantle the power supply until you can get to the fuse. Test the fuse with a continuity tester. If the fuse is blown, buy an exact fuse. Don not deviate.
If the fuse is not blown, you may need a new power supply.