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NGuzman Posted on Jan 22, 2015

How to Turn Off the Bobbin Sensor in the Bernina Artista 640

I have had this machine for 4 years! Since almost the first year I purchased the machine, the bobbin sensor keeps coming on... so I can stitch about 15 to 20 stitches before it stops. I've taken the machine in for repairs, and it always works out for 2 weeks and then again, the sensor comes up!!!! How do I turn the sensor off?????

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Daniel

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  • Contributor 42 Answers
  • Posted on Dec 05, 2016
Daniel
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Make sure you're using the appropriate bernina bobbin, others can confuse the sensor. This video(by Bernina Boys) shows how to clean lint to prevent this problem which is what often causes this error. Or go into settings by pressing the diamond with right hand arrow inside of it. The eye with the speaker next to it should get you where you need to go to turn it off.
The manual on Bernina's website is here:
https://www.bernina.com/en-US/SupportData/BERNINA-Nah-und-Stickmaschinen/artista/Manuals/031508-50-04_0601_a640_EN

page 98 has the information you want.

5 Related Answers

Anonymous

  • 3 Answers
  • Posted on May 22, 2008

SOURCE: Bernina Bernette 600 Deco embroidery machine

It could be that there is a loose piece of thread, or some fluff which is obstructing the tension gauge. Try blowing around the theading area (or even run the hoover pipe near it to see if you can **** it out). I cleared mine by folding a piece of non fluffy material and rubbing gently between the tension dial and machine.

Good luck

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Anonymous

  • 97 Answers
  • Posted on Mar 09, 2009

SOURCE: My Bernina 1530 stitches are faulty - with loops

This is almost always indicative of an upper tension problem.
First, make sure you're using a good quality thread. If you're using thread that's not of European manufacture, you're probably filling your tension assemblies with little fuzzies. Coats and Clark Dual Duty is the most notorious thread for causing tension issues. If you have a bunch of this thread: throw it away or use it for hand sewing.
Turn your machine off, and use some canned air to blow out your upper tension assembly. (It looks like a couple of little cymbals inside the thread path.) Set your tension dial to 4.5.
When threading, right before you actually thread the needle itself, and with the presser foot up, "floss" the thread back and forth by holding the thread at the top by the spool with your right hand, and down by the needle with your left hand. This will ensure that you force the thread into the tension assembly.
Also ensure that your bobbin is oriented the right direction, but this would be a less common cause for your symptom.
If none of these fixes work, you probably need to have your tensions professionally calibrated.

-R

radcal

  • 196 Answers
  • Posted on Apr 09, 2009

SOURCE: Bobbin Winder Works--Stitching Does Not

The second microswitch that is located just to the right of the bobbin winder stop tells the machine that it is set to wind a bobbin.

If the machine does not indicate that the bobbin winder is engaged, the second microswitch is not the problem. The bobbin winder itself is what shifts the clutch. If it is pulled downward, the clutch is disengaged and the upper shaft does not turn. Place your thumb under the bobbin winder, push it upwards and the clutch automatically re-engages and the shaft will turn.

Be very careful with the touch screen cable with the front cover off. If it has the older style cable on it, they are very delicate when releasing and reconnecting. If you put the front cover back on and the touch screen does not work, this will be the most likely problem. You will need to have the touch screen replaced.

You need to get your bobbin winder turned off first, then worry about the stop contacting the thread. If the stop is not tripped, then it is in its normal position and everything should work fine.

When not filling a bobbin, simply raise the bobbin winder and you should be ready to sew. Look at the opening around the winder shaft in the front cover and you will need to have it up and to the right. Just push the shaft with your thumb.

Anonymous

  • 6 Answers
  • Posted on Apr 11, 2009

SOURCE: Unbalanced lower tension when using BSR free motion quilting

try using a straight stitch plate, this will help resolve some of the eye lash effect. 

RickE1

Rick

  • 202 Answers
  • Posted on Mar 18, 2010

SOURCE: can you tell me what the bobbin image on the

Hi, most likely your bobbin sensor is being blocked by something. Common causes are a dirty sensor. Q-tip on the eye of the sensor inside the bobbin door. Or there is fuzz blocking it. Next take out the bobbincase and the bobbin. Look in the bobbincase and you will see a round spring. This spring acts like a brake for the bobbin. Sometimes these springs will get moved and out of position blocking the little space that the bobbin sensor reads through. Reposition the spring so you can see through it and the bobbincase.
That should do it.
Good luck.
Rick Engel
Bernina tech

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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 .

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Hi, most likely your bobbin sensor is being blocked by something. Common causes are a dirty sensor. Q-tip on the eye of the sensor inside the bobbin door. Or there is fuzz blocking it. Next take out the bobbincase and the bobbin. Look in the bobbincase and you will see a round spring. This spring acts like a brake for the bobbin. Sometimes these springs will get moved and out of position blocking the little space that the bobbin sensor reads through. Reposition the spring so you can see through it and the bobbincase.
That should do it.
Good luck.
Rick Engel
Bernina tech
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