Siemens PORTARAY HELIODENT 70 Maintenance Instruction page 46

Fig.58
Fig.59
2. Friction pad
The adjustment sequence is: loosen screw (a)
of arm to be adjusted (1 1/2 turns). Position
the X-ray head in a 450angle to the vertical
scissor arm. The arm with the X-ray head
shall remain stationary at a 45° angle as shown.
When lowering the X-ray head (to less than
45°) the X-ray head must return to 459 angle
by itself when released. Spring adjustment
is made with screw (d).
When raising the X-ray head (to more than
450) the X-ray head must return again by
itself when released. Spring adjustment is
made with screw (c).