3D6 TAJIMA EMBROIDERY MACHINE

Question edited for clarity and typos.

Did you try replacing the motherboard battery.

https://www.google.com/search?q=Tajima+tmex-c901+error+3d6

and

https://www.google.com/search?q=Tajima+tmex-c901+software

..

Question edited for clarity.
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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?

If the color change motor on your Tajima embroidery machine is making noise but not moving, it could be due to a few different issues. Here are some troubleshooting steps you can try:

1. Check the connections: Make sure all the cables and connectors that attach to the color change motor are securely connected and not damaged.
2. Check for obstructions: Look for any obstructions that may be preventing the motor from moving freely. This could include thread or debris that has become tangled in the mechanism.
3. Lubricate the motor: If the motor is making noise, it could be due to lack of lubrication. Try adding a few drops of oil to the motor shaft to see if it helps.
4. Replace the motor: If none of the above steps work, it may be time to replace the color change motor. You can order a replacement part from Tajima or a Tajima dealer.

Note: If you're not comfortable with troubleshooting and repairing your embroidery machine, it's best to contact a professional technician for assistance.

PROBABLY ONLY FROM THE MANUFACTURER

I hope this link will help.
http://www.digitsmith.com/tajima-tmfd-g1220-type-2-error-316-a-31639.html

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

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:

Your new embroidery program has to be loaded first. The 2b7 is referring to needing instructions or in other words the embroidery program has to be loaded. Shut the machine down and turn the machine back on and load just as before.

We are having a similar problem with one of our single head Tajima TMEX-C1201 machines. In our case the design runs part of the way, then the head jumps and continues running and ruins the work. Any feedback on this would also be appreciated. Thanks.