Chapter D - ADJUSTMENT & CALIBRATION
D-18 Planmeca Proline EC X-ray unit
PATIENT POSITIONING MECHANISM
Technical Manual
Checking the eccentricity of the rotation movement
The eccentricity of the rotation movement must be checked after the patient positioning
mechanism adjustment. This is done by comparing the distances between the line on the
alignment ruler and the x-line on the ball phantom in “0° position” and in “180° position”. If the
deviation is more than ±1 mm, the position of the secondary slot should be adjusted.
Entering the 180° position:
Enter the test mode.
Press the ready key to drive the X-ray unit to the exposure position. When the unit is ready
the indicator light will come on.
Start to take a test exposure by pressing and holding down exposure button on the remote
control. Stop pressing the exposure button after about 16 seconds so that the rotating unit
stops moving (near the end position).
An error code will appear on the display. Clear the error code with the CTL-key.
Manually position the rotating unit so that the center line that runs through the tubehead and
sensor head is at a right angle to the wall. Slide the alignment pin through the hole in the top
of the vertical carriage so that it goes into the positioning hole in the rotating unit.
NOTE Adjust the position of the rotating unit by holding the sensor head. Never use the tube-
head to adjust the position.
Leave the ball phantom tool in position. Place the alignment ruler in position between the pri-
mary slot and the secondary slot as described earlier. Measure the distance between the line
on the alignment ruler and the x-line on the ball phantom (
Fig. 25). The distance must be less
than 1mm.
Figure 25 180° position
If the distance between the line on the alignment ruler and the x-line on the ball phantom is
more than 1mm, the secondary slot position must be adjusted. Move the secondary slot
towards the ball phantom’s x-line until the distance is less than 1 mm.
READY
PRET
Er 00
START
END
PLANMECA No.50971
X-LINE
Y-LINE
X-LINECA.EPS
Alignment ruler
Ball phantom
Tubehead side
Secondary slot side
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