Bernina Sewing Machines - Page 9 - Recent Questions, Troubleshooting & Support

https://www.manualslib.com/manual/787495/Fritz-Gegauf-Bernina-Artista-630.html

Check power status LEDS behind service panel. See service manual on how to access and interpret

Hi, there is no top cover on this machine. First the side cover has to come off then the back cover. Under the back cover there is a rigidity plate with many screws that has to come off and then you might be able to get at the take up lever mechanism. I'm not saying you can't do this but it might just be the time to have a tech go in and service this machine completely.
The thread must have slipped out of the end of the takeup lever and wound in the mechanism.

It’s in the settings screen

Turn the knob at the end of the lever. Or inside the lever

A 535 should be under warranty still. Do you have sewing lights? If not, then it is the power supply PCB. See your authorized Bernina Dealer. Electronic issues can only be repaired at a dealer because of Bernina’s stringent parts and technician training requirements. That’s why Bernina’s cost the big bucks. ??

Implies low or no top thread tension.

Thread machine with foot UP. Test thread tension by lowering foot and make a long slow pull of thread. Then raise foot and make another long slow pull. There should be marked difference between foot up(no tension) and foot down(set tension as selected).

If no difference, increase thread tension an retest. If still no tension tension discs have debris, thread not captured in discs, or broken tensioner.

Could be top thread not unspooling evenly. Also make sure there is no burr on the needle tip or needle is bent or test with a new needle.

I've had this same problem with my Husky. For me it was the connection between the machine and the foot pedal. The plug wasn't sitting properly in the socket. Try holding the plug securely in the socket when pushing the foot pedal. Gently wiggle the plug to see if there is a spot where it will work. I ended up wrapping one layer of electrical tape around the plug, and haven't had that issue since. It could also be the foot pedal itself. If you have another foot pedal with the same plug, try it too. I hope this helps, good luck, have a great day.

This is not a DIY problem. Sorry. Consider the possible alternative causes: broken reverse assembly, stuck reverse button, dirty dogs (stop laughing), computer board problem. Here are some prior looks at this problem: https://www.fixya.com/support/t26432690-feed_dog_issues_bernina_1260_will_not Other than cleaning the dogs or tightening a few screws, the other tasks require an expensive service manual from the outset, tools, and possibly parts. Note the complexity of a disassembly process of an earlier model : https://www.youtube.com/watch?v=o0Zh2c3Pk44 The ordinary user manual does not seem to troubleshoot (page 45) the problem: https://www.bernina.com/en-US/SupportData/Out-of-Print/BERNINA_1260_manual https://www.youtube.com/watch?v=c1zYD1m22hk

Turn it off then back on. If it is still in service mode something is wrong - take it back to your dealer.

Page 46/47 has some info of fuse under motor control and page 48/49 show the fuse in the electrical diagram. manual on 1120 https://www.manualslib.com/products/Bernina-1120-3964686.html

I`ve had it when my needles jammed...hence locked up the machine...only thing to do is a pair of wire cutters break the needle and re assemble

Sewingpartsonline, ebay, Amazon

Usually, if the thread is messing up under the fabric, it is a top thread issue. This is sometimes referred to as thread nesting or bird nesting. Make sure you are using a brand new needle of the type specifically for embroidery. The eye needs to be large enough to easily accommodate the thread size and it needs to be a sharp needle. It may help to use a needle with a larger scarf that will protect the upper thread when piercing the fabric. If the thread is not protected sometimes it will hang up on the underside of the fabric when the needle withdraws from the fabric, causing thread loops, etc. Remove the thread from the machine. ALWAYS RAISE the presser foot and rethread from the beginning. (This releases the tension disk so the thread seats completely.) Verify the thread path is correct. Use a bobbin thread that is compatible with the embroidery thread. Check that the bobbin thread is smoothly wound on the bobbin, that the bobbin is turning the correct direction in the bobbin case, and the bobbin case tension is threaded properly. Retest your embroidery on a small project. If you are still seeing thread bunching up under the fabric, you need to tighten the upper tension. Balanced Embroidery Thread Tension Must For High Production And Quality... thread tensioning Madeira 10 Tips for Taming Sewing Machine Tension Problems ...

adjust the top thread tension to tighter

Sorry we are not a parts seller.

The Bernina Record 930 has two belts (for upper and lower cogs). You can buy the belts at some sewing machine parts supply shops. One source is https://www.sewingpartsonline.com/bernina-930-sewing-machine-parts.aspx . Manuals Lib has the service manual for the Bernina 930 here: https://www.manualslib.com/manual/1353778/Bernina-930.html . Page 58 shows how to adjust the tension on these belts, https://www.manualslib.com/manual/1353778/Bernina-930.html?page=58#manual . See pages 2-4 to remove the covers to access the machine internal parts. Wait at least 30 seconds after unplugging the machine before removing the panels to allow the capacitors to discharge. I hope this helps. Cindy Wells

Sounds like the small plastic cog/gears have slipped, this rarely happens and usually is from pulling heavier fabric through the machine while trying to sew. The teeth on the feed dog grips to a portion of the fabric and is tugged out of the track of the path of the rotation... Not necessarily an out of timing issue if they are rotating independently, but likely will take a tech to disassemble it and replace the part(s). They likely will need to be replace rather than just placing them back into place. Hope the response is helpful..

Motor may need new brushes. If it has not been cleaned in a while, oil may have hardened causing excessive resistance.

Bernina usually puts the model number somewhere on the front of the machine. It is also on the plate that has the serial number, etc.

Bernina calls this the stitch plate (where the feed dogs come up and the needle goes down). To remove the plate, turn off the sewing machine. Remove the sewing table if it is in place. Take off the presser foot and remove the needle. Open the free-arm cover (bobbin cover in the sewing machine front view, page 4) by tilting it down towards you. Press down on the back right corner of the stitch plate and lift the stitch plate off to remove it. See page 68 of the manual for the Bernina Artista 170 for the pictures that go with the above steps. Bernina has the manual on the product page: https://www.bernina.com/en-US/Machines-US/Series-Overview/BERNINA-artista/BERNINA-artista-170 . The current link to the manual is https://www.bernina.com/BERNINA/media/Support/Sewing_Quilting_Embroidery/artista/artista_170/Documents/EN/008853-73-04_Naehen_a170_EN_online.pdf . I hope this helps. Cindy Wells