How can I fix the error code 321 on Tajima embroidery machine TFSN 920?

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The maker has a contact form

Tajima group official site - Embroidery machine manufacturers

Tajima Embroidery Machine https://www.tajima.com This is the website of Tajima Group, the leading manufacturer of embroidery machines. Introduction of TAJIMA's multi-headed embroidery machines and ...

Check the Motherboard battery.

https://www.t-shirtforums.com/threads/reinstalling-firmware-on-a-tajima-tmex-c1201.576273/

Repeated here for C1501

http://www.digitsmith.com/tajima-tmex-c1501-software-75796.html

Video may help?

Hi,

It sounds like 3d6 error means a program isn't installed properly. Please check your CPU cards and if necessary, reinstall the programs on your machine. Thank you.

Not good

321. Tajima explains this as a pulse motor driver failure. This means that one of the circuit boards that drives your frame front to back (X), or side to side (Y), or possibly, the main shaft driver has failed. You can check the status of these boards by looking for a red light on the small silver box usually located on the chassis under head 1 or 2. If you see a red light it means that there is an electronic fault with the board and it will probably need replacement.

https://tajimaowners.com/pdfs/ErrorCodes.pdf

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This should be in your Troubleshooting guide in the manual.
Here are some codes related to trouble codes on a Tajima machine, may need the correct error codes for your make Model machine.

http://www.theembroiderywarehouse.com/errorlist.pdf

Cheers and good luck!
Embroidery Services
San Diego, CA

2CF - An immediate stop came in from an external. Check the external device or the connection to the external device.
device TMLG, connector joint 16 JH08

Check for a loose connection in any external device like a keyboard or card reader.

Which model number.
Hirsch Support Tajima Embroidery

Error codes are listed here.
Tajima TME DC Electronics

Hello, Error 225 Travel outside the set embroidery area
( When the software frame limit is set, or
on cap machines) Here is website for all the errors: