Planmeca ProMax 3D Max with ProTouch Technical Manual page 122

5 Panoramic and 3D calibrations
116 Planmeca ProMax 3D Max
1.c. Touch Calibrations (3200) --> Calibrations (3200) --> Scara Arm
(3250).
2. Select Scara Arm Calibrations (3251).
3. Drive the C-arm to the calibration position by touching the Drive to pin
point button.
Note that even all the three values (Shoulder, Elbow and C-Arm) are
green, it might be that the angle sensors are not correctly calibrated.
A red value means that the angle sensor in question is not correctly
calibrated.
4. Touch the Release motor button.
5. Remove the shoulder arm upper cover.
See the instructions given in section "Removing shoulder arm upper
cover" on page 199.
Technical manual