I just bought a 730 Bernina sewing and embroidery system. I just tried to send design to embroidery machine and got the message I have no memory left. How can I add memory?

Check with your Bernina dealer. I believe you can have them update the software on your machine.

Hmm, update W10 2018; It was ...
Update for your software is on Benina page now

Creativity with Color PhotoStitch and 3D embroidery designs

There are actually two Bernina 730 machines (confusing, huh?). One is the 730 Record from around 1960. The other is the more modern 730 computerized model made in the 21st century.

The 730 Record has a hidden pressure adjustment. Lift the top cover and locate the screwhead on the very left side (left of the takeup lever knuckles). This screw loosens or tightens the spring that applies pressure on the presser foot.
The manual can be downloaded here, although it does not show the pressure adjustment:
BERNINA Sewing Systems

On the computerized 730, the pressure adjustment is on the screen (pg 37 of the manual):

BERNINA Sewing Systems

...

you may have to contact bernina tech support for the help

Getting That Embroidery Design To Your Janome ...

https://tv-sewingcenter.com/janome/getting-that-embroidery-design-to-y...

Aug 21, 2010 - The designs will then be recognized by your embroidery machine, and you will spend more .... you can use either jef or jef+ for your 11000se .... like to know what brand,size and card reader to purchase for my Janome MC 9500. ...... Bernina · Elna · Embroidery · General · Janome · Necchi · Quilting · Sewing ...

Janome MC9500 100 Stitch Sewing 5.5x8" Embroidery ...

www.allbrands.com/products/8905

Janome MC9500 5.5x7.8" Embroidery .jef Format Replaces Memory Craft MC9000 ... to creative quilting and clothing construction, your sewing projects will go ... designcards) or Compact Flash Memory Cards (as used in digital cameras). ... My set screen controls for contrast, In./Cm. designation, and other customization

Which format does my machine use? - Embroidery.com

https://www.embroidery.com/help.ec?docID=225

Here are two other possibilities other than electrical problems with your Bernina. There are embroidery design cards that were made for the 200 & 730 that simply do not work in a 180. There is nothing marked on the card or the packaging that will tell you what model machine the card will work in. I sold a bunch of my design cards on eBay last winter and I tested all of them in both a 730 and a 180 before making the ad discription. I found that most of the design cards worked in the 180 & 730, but there were a few that only worked in the 730. So if your design card is one of those that won't work in a 180, that could be your problem.
You did not say if you have other design cards that do work or there is only one you tried. Possibly the card itself is bad.
A static shock to the card could possibly damage it.
So if you take your machine to a dealer to have it looked at, take your design card along.
The 180's memory for storing designs is located in the embroidery module, not the machine itself. If that memory is filled up with other designs this can cause a problem.
So your problem is most likely with the design card or with the embroidery module. Should you need to get another embroidery module, that module needs to be the same version number as your machine or it will not work. I have a. video posted on YouTube that shows you how to check the version number of your machine and module. That information is in my "Bernina check hours 165, 170, 180, 185" video. Put that in the YouTube search box and you will find my video. Plus I have other helpful Bernina videos posted.

A 200e that locks up usually need a memory and a firmware upgrade. The original 200's only have 32mb of internal memory. The upgraded mini print board that is used in the 730 has 64mb of memory. This 64mb board was used in the 200 as a upgrade and this stopped the lock up problem. Also over the years Bernina has improved the firmware and this also cures the lock up problem. The latest and probably last firmware version for the 200e is version 5, also called the cutwork version. The easiest thing for you to do would be to take your 200 to a dealer and have them install a 64mb mini print board and also upgrade your machines firmware to the latest version 5. Also if you have loaded embroidery designs in your machine, remove them as they use up the machines memory. When you get too many designs loaded even if you have a 64 MB board in your machine you can still have lockup problems.

Is this it?

ArtLink V6 Support BERNINA

BERNINA ArtLink 6 Embroidery Software For Everybody sewhere com

BERNINA ARTlink6 0

BERNINA ArtLink 7 Embroidery Software

BERNINA ArtLink V7 0N

ArtLink 7 File Transfer

Artlink V7 FREE Download

I would ask the technician at the Bernina dealer.

The thread sensor eye is probably dirty.