Sounds like the timing needs to be adjusted.  Look for a Brother dealer in your area to have the machine looked at.  It is still under warranty.

Okay - sloppy meaning that the top stitches are loose than tight than loose than looser...looks aweful!!! And the last few trials, it has pulled thread down into the bobbin area locking up the needle. Yes, I am using embroidery thread and the machine was working fine on the thread that I have. I had to use my Brother 270D while my 770 has been down, and it works absolutely fine. I am using the factory bobbin as well.

I purchased it through HSN because I could do flex payments through them. Just got it 2 weeks ago.

Do you guys use prewound bobbins? If so, anyone know what ones I'd get for my 770?

THanks so much for your help!!

Work with your local dealership to get training and Pattiann is right on target.  The prewound bobbins are the best!

You may have to pay for the training, and frankly, it can be expensive.  Read the forums and blogs here.   I started with a 270D as well, and frankly, it was LOUD but hard working.  You are going to love your 770 when you get the kinks worked out. 

Pat 

My problem is solved!! A found out that my bobbin casing wasnt all the way seated!!! Once I seated it, all is well again!! Whew!! Thanks for all your suggestions everyone!! It kept me problem solving and trying things!!!

Thanks - Im so happy its working again!!! I was working on an outfit for a Make A Wish child who leaves on her trip next week!!!!!! It had lots of embroidery on it!!!

I am also having tension problems w/my PE-770. I've adjusted both the bobbin tension and the top thread tension.  At one time the entire backing of my design was almost totally all bobbin thread.  Adjusted the bobbin tension, got a little better.  Now testing by embroidering letters and there's just a tiny streak of bobbin thread on the wrong side of design (where it should be showing just a bit of the top thread).  In other words, now the top thread almost entirely covers the back of the design.  I've been going back and forth w/the adjustments at least a dozen times!  Please help me...I bought this machine to make Christmas gifts this year. :-(

Hello!

If you go to this blog you will find some sample/testing formats for various embroidery formats.

It will help you determine what is happening.  Sometimes when people work with the tension, it can get really out of whack. 

One thing that I would like to suggest is that when you get a new machine, or it has just been fine tuned by a technician, take a photo of the settings and/or write down all the settings as you see them.  We cannot be expected to remember all the issues involved in this machine. 

Knowing that the bobbin case screw is at say 2 o'clock, just may help in the future.

Pat, The Avid Embroiderer

Try another design and/or a different stabilizer.

If the problem continues, take the machine in for service.  Take a sample of the stitching with you.  Before bringing the machine home ask to run the design to see if issue has been resolved.

I have not heard of seating the bobbin.  I have heard of threading the machine with the presser foot up so the top thread seats in the tension control.

Refer to the maintenance section of the manual to be sure the bobbin case has not been knocked out of place in the race/shuttle.  Turning the hand wheel until the needle is at it's highest position will place the race in the correct position to accept the bobbin case.

Make sure the bobbin is placed into the bobbin case so the bobbin thread is feeding from the bobbin spool in the correct direction and through the tension adjusting spring on the side of the bobbin case.

Since the jam, the needle could be bent and needs to be replaced.

Try a different color of thread to see if the shredding continues.  Black is one color that is weakened during the dying process.  If this is the color you were having an issue with, try a better brand of embroidery thread.