To access the service menu on your Bernina 830, you can follow these steps:
- Turn off the machine and unplug it from the power source.
- Hold down the Reverse and Needle Down buttons, then plug the machine back in while holding these buttons.
- Continue to hold down the Reverse and Needle Down buttons until the service menu appears on the screen.
From here, you should be able to navigate the service menu using the arrow keys on your machine. To access the calibration option, you will need to select the "Touch Test" option from the menu.
Unfortunately, without a working touchscreen, it may be difficult to navigate the service menu. One option may be to try using an external USB keyboard, as you suggested. However, this may not be compatible with the Bernina 830, so it's not guaranteed to work.
If you're unable to access the service menu or calibrate the touchscreen, it's possible that there may be a hardware issue with the machine that needs to be addressed by a professional technician.
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