Flatline Acti-Feed

Follow steps below to confirm if your machine is Flatlining.

1.  Test for flatlining on thicker fabrics. 4 Layers of 3oz backing can be used.

2.  Test for flatlining on needle #1 and #16.

3.  Update your software to the most recent software version.

4.  Check your Bobbin and Presser Foot. If these are not correct the test will produce a misleading result. It is recommended to do the test with a new bobbin.

5.  Reduce the Auto Minimum/Preset Acti-Feed to 0 and check for Flatline.

In this example the machine is flatlining at 0.


6.  Ignore any tie-in or tie-off sequence, they have their own Acti-Feed calculation.

In this example the machine is flatlining, the spike at the start was a tie-in and does not confirm the machine is not flatlining.


7.  Flatlining only occurs when the Current Acti-Feed never increases itself from the Minimum.

In this example even though there is a long straight line, the machine is not flatlining. This is because the straight line is at 4 while the minimum is set to 1.


8.  Ignore the Current Acti-Feed if it is negative during a tie-in/tie-off.


9.  The below picture shows normal Acti-Feed that is not flatlining.


10. If your machine is flatlining, follow the steps below. Otherwise, skip any additional steps.

11. Turn the machine off and reseat the Thread Sensor Harness.  Use caution not to break the wires or plug.


12.  If the Take-up Lever Drive Gear is not aligned you might see Skipped Stitches or Flatline Acti-Feed.

skipped stitches.png

13.  If the situation remains unresolved, you will need additional technical assistance. Here are the available Melco Technical Support options.

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