Planmeca ProMax 3D Max with ProTouch Technical Manual page 173

5 Panoramic and 3D calibrations
6. Check and if necessary adjust the lights.
The lights (1) and (2) should coincide with the ball phantom x-line, and
the light (3) should coincide with the y-line.
NOTE
The lights (1) and (2) must be exactly on the x-line, otherwise they
deviate from each other. If you see two parallel lights, the lights must be
adjusted.
If the light beams do not coincide with the lines or if they are not in focus,
they should be adjusted.
TIP
When adjusting the lights (1) and (2) in the figure above, it might be
useful to cover one light e.g. with tape, when adjusting the other.
To adjust the lights see the alternative instructions below, depending on
the laser light types in use.
Technical manual Planmeca ProMax 3D Max 167