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• If the machine stalls upon moving the axis with the pendant or onscreen controls, use a ruler to measure a certain distance on the stalled stage and record the rotary and linear encoder reading for both positions. 

• If the machine still can be driven with the pendant or onscreen controls. Release the E Stop.

• Move the axis to a position near the negative hard stop -do not let the stage reach the hard stop-. Click "Set 1" in Alpha Tune.

• Move the axis to a position near the positive hard stop -do not let the stage reach the hard stop-. Click "Set 2" in Alpha Tune.

• Move from Position 1 to Position 2 by clicking "Go 1" and "Go 2"

• Repeat this 10 times and record the "Ctrl", "Meas", "Sync" and "Index Mark" values.

• Do the “Ctrl” and “Meas” counts repeat when returning to the same position? .

• If “Ctrl” is losing counts, check the coupler is tightened, and realign the drive.

• If “Meas” is losing counts check the coupler is tightened, and realign the drive.

• Switch breakout boards between X and Y axis, test counts again in Alpha Tune. If the problem follows the breakout board, then replace it.

• Switch X and Y cables on the logic board, test counts in Alpha Tune. Make sure the axis selection in Alpha Tune is inverted between X and Y. 

• If the problem remains in the same axis connection on the logic board, change the logic board.

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