Planmeca ProMax 3D Max with ProTouch Technical Manual page 216

8 Parts replacement and repair
210 Planmeca ProMax 3D Max
1. Detach all the cables (e.g. power supply cable and exposure switch
cable) from their Input module connectors.
If the X-ray unit is equipped with a locking plate, it must be removed first.
Unscrew the two M4X12 DIN7984 screws (1) on the plate (2) with a 2.5
mm Allen key and remove the plate.
Technical manual