TBS Calibration (Sensitivity and Feed Adjust) are detailed in the EMT16X Operator Manual - Advanced Interface
Those settings should only be modified if all of these are confirmed to be correct and sew quality or real/false thread break messages persist:
Here is the Machine Calibration process:
1. Load the Calibration Adjust_01.ofm design available at the bottom of this article. (also located in C:\Program Files (x86)\Melco\Melco OS v11\Test Designs)
2. Load 1 layer of backing + 1 layer of Broadcloth to an 18 or 22 round hoop
3. Set Needle 8 or 9 for the test
4. Go into Tools – Settings and check that Feed Adjust is set to 0. This is the default starting point. (Note: For older versions of Bravo OS and Melco OS - version 11.09.099 and earlier, the Feed Adjust default is 20. Updating to current software version is recommended.)
5. Set Acti-Feed to Auto and around 2 points below material thickness. ie. if the combination of backing and broadcloth is around 6pts set Acti-Feed to 4.
6. Run the design and look at Acti-Feed current value. The feed should be running at around 6pts, its normal that it oscillates a bit.
7. At the end of the design sew-out, remove the hoop and look at the back of the embroidery, the bobbin column should be around 1/3 of the total column, some people prefer more or less bobbin percentage and that’s fine, just adjust the calibration to the preferred bobbin column preference. If the bobbin column is too wide increase Feed Adjust by one point and repeat. If the bobbin column is too thin then decrease Feed Adjust by one point.
8. Once you are happy with the results, then load Calibration test design and run that design to verify that no false thread detection is detected, design should run straight through with no issues.
Sample of Calibrated design: