When the battery is first inserted or replaced, the MIH enters a datum mode routine which must be successfully completed prior to use. The A and B-axis position detectors within the head require datuming to a zero position before the LCD will display the correct A and B-axis positions. Datuming the head will also be required if a head datum error occurs during use.
On entry into datum mode the LCD shows a datum error. Unlock the head to reset datum.
Rotate the A and B-axes to their zero positions by aligning the zero position markers on both axes.
Lock the head in this position and press the M+ and M- buttons simultaneously to reset datum.
The display will now change to show A and B-axis data at A0.0, B0.0. Datum is now set and the A and B-axis displays will show positional data when the head is locked and unlocked.
Confirm that datum is correctly set by rotating each axis to its extreme positions and check that the position data on the LCD is correct.
A-axis 0° to +105° plus overtravel
B-axis ±180° plus overtravel.