Acer Aspire ZS600 Service Manual page 212

Change the calibration fixture to 9 horizontal lines, and do the lineation from upper to lower
with line from left to right to calibrate horizon with the touch pen (Refer to the sequence of 1→
2 → 3 → 4 → 5 → 6 → 7 → 8 → 9 and the arrows in the picture above).
4-18 Troubleshooting