Brother PR600II Service Manual page 256

Test mode
13. Clear trip
When this mode button is selected, the current values for the stitch counter and sewing time counter (Total and Trip) are
displayed on the left side, and the [Clear trip] button is displayed on the right side of the screen.
Pressing the [Clear trip] button resets [Trip Stitches] and [Trip Time] to zero.
And the [Trip Stitches] and [Trip Time] are saved at the "Maintenance" of the lower step.
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