Lasers - Planmeca Proline XC Technical Manual

Chapter I - FUNCTIONAL DESCRIPTION
The operating range of this motor is controlled by four sensors on the CASSETTE LIMITS cir-
cuit board. Two of them control the position of the secondary aperture (cassette holder car-
riage) and two the end limits of the cassette holder movements.
When driven to READY position the motor is operated till both the cassette holder and the
cassette holder carriage start sensors are active. If the cassette is pushed aside the system
will seek back for the sensors. When driven to the end direction normally a certain length is
driven and no sensors are used. The exception is when the equipment is powered on with the
cassette not on the start sensors. Then the cassette is driven all the way till it finds the end
sensor of the cassette holder.
In panoramic models the end sensor of the cassette holder carriage is never used. It is used
together with the end sensor of the cassette holder to detect the right position of the second-
ary aperture when in cephalostatic mode.

2.4 Lasers

To make it as easy as possible to position the patient rightly, three positioning lights are pro-
vided. All the lights are similar in construction. The light beam adjustment is done by bending
the mirror rather than moving the bulb and therefore the bulb replacement does not necessar-
ily need the adjustment procedure. It is good practice though to check the adjustments.
Layer positioning laser
This laser is located under the lower fixed part cover. It is reflecting a narrow light beam verti-
cally to the face of the patient in order to indicate the horizontal layer where the imaging is at
the sharpest. This is the most critical of all the lasers, because without this laser there is no
indication of the actual sharp layer place.
Sagittal positioning laser
This laser is located in the upper fixed part. It is reflecting a narrow light beam vertically along
the center line of the patient's face to help the centering of the patient.
Frankfurt positioning laser
This laser can be found in the cassette end of the rotating part. It reflects a narrow horizontal
light beam on the left cheek of the patient. It's vertical position can be altered by hand to cor-
respond the patient's characteristics. The purpose of this laser is to help to position the
patient's head to be horizontal.
I-16 Planmeca Proline XC X-ray unit
ELECTRICAL PARTS AND THEIR FUNCTIONS
Technical Manual