Planmeca ProMax 3D Max with ProTouch Technical Manual page 172

5 Panoramic and 3D calibrations
166 Planmeca ProMax 3D Max
3.c. Slide the transportation pin (2) through the hole in the elbow joint
so that it goes into the positioning hole in the C-arm.
The positions of the transportation pins are shown on the figure
below.
1 Shoulder joint pin
2 Elbow and C-arm joint pin
NOTE
If transportation pin (one or both) does not fit into its position hole
in the pin point state (after Drive to pin point button), the X-ray unit
is not correctly calibrated. Check the angle sensor calibration, see
section "Calibrating angle sensors" on page 115.
4. Attach the ball phantom into the patient positioning mechanism.
5. Stick strips of masking tape (or similar) on top of the x- and y-lines on the
ball phantom.
You can mark the crossing points of the light beams on the tape, and the
light beams can be seen more clearly.
Technical manual