Acer Aspire ZS600 Service Manual page 209

Following the sequence: upside line (left to right) → right line (upper to lower) → downside
line (right to left) → left line (lower to upper) to do the calibration flow 2 with the touch pen
(Refer to the sequence of 1→ 2 → 3 → 4 and the arrows in the picture above).
4-15
Troubleshooting