How do you take the back off of the Husqvarna 870 Quilt sewing machine?

http://www.husqvarnaviking.com/SiteFiles/ClientSite/4b/4b34186a-c25f-4c4a-8d8f-dd58c7e2c801.pdf
https://www.manualslib.com/manual/791970/Husqvarna-Viking-H-Class-100q.html?page=39
https://www.manualslib.com/manual/806245/Husqvarna-Sapphire-875-Quilt.html?page=47
https://www.ebay.com/b/Husqvarna-Viking-Sewing-Machine-Parts-Attachments/41248/bn_7625451

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Husqvarna Rose 600 manual

I just found several on the internet for free download.

have an authorized Viking repair dealer check it out it be one of several easily fixed problems.

Could be several things.

First, install a brand new needle, perhaps a top-stitch needle will work better because it has a groove in the shaft that protects the thread. Make sure the needle is the appropriate size for the thread you are using--a needle eye that is too small will cause the thread to hang or shred. When the needle penetrates the sandwich, the top thread forms a loop. If the eye is too small, the thread will not come back up through the sandwich, leaving a loop under the fabric.

Remove the top thread from the machine.
ALWAYS RAISE the presser foot and rethread from the beginning.
Set the top tension to the midway point and retest your machine on a quilt sandwich made of the same fabric layers as your project.. Tension problems are more evident when sewing multiple layers of fabric, so tweak the tension until the top and bobbin threads meet in the middle of the sandwich.

I don't believe you will have to adjust the bobbin tension, but in case you do, be very careful. Mark the tension screw setting FIRST so you can reverse any changes you make. Bobbin adjustments are made in very SMALL increments. Because I tend to use a lighter weight thread for my quilting, I have a specific bobbin case that is adjusted for my quilt thread and I keep my other bobbin for regular sewing. Then I don't have to keep adjusting the bobbin tension when going from sewing a quilt to something else.

Some machines do better with certain brands of threads than others.

Adjusting Sewing Machine Tension to Prevent Problems

Has the take up lever been replaced with the new updated one that does not let the thread slip out?

you can put a piece of tape on it to keep the thread from coming off

or as one service tech showed me, take a pair of pliers & put a small cloth over the thread take up

lever & take the pliers & gently mash down the take up lever closed or as much as need to keep

the thread from coming off

The best thing to do would be to contact Husqvarna
http://www.husqvarnaviking.com/us/2821_3070.htm

I had this same problem, on my Designer Diamond. I blew it out with an air can and that didn't work, but then I decided to turn it off, then back on and start sewing a line in reverse. That seemed to fix it. My machine is working fine now.

The overload message is usuall due to a bind in the mechanical function of the machine. When the motor has an extra "load" caused by something like a tight belt or dry bearing, it "overloads" the motor and the error message is displayed. It is doubtful your problem is computer related. Either way a trip to your service tech is required. If you continue to sew with it, you do run the risk of possible damage to some other parts of your machine. The computer portion of your Husqvarna is guaranteed for 5 years and the mechanical parts carry a 20 or 25 year guarantee depending on when you purchased your machine. A copy of your bill of sale from a Husqvarna Viking dealer or a stamped warranty card is the proof of purchase needed to obtain warranty replacement of parts. Labor is only guaranteed for 1 year.