Universal Radiographic System
Service Manual
SM-0524R4
30
4.4.2 PERPENDICULARITY ADJUSTMENT OF X-RAY BEAM WITH IMAGE RECEPTOR
In case that perpendicularity is out of tolerance (top ball is out of first circle),
adjust perpendicularity as follows:
1. Place the Swivel Arm in vertical position. The Tube-Collimator Assembly
has to be perfectly aligned with the Bucky Assembly. Check with a level
correct horizontal position of both assemblies.
The Bucky Assembly is factory adjusted (slightly up) and it is
recommended do not perform any additional correction. During
procedure, it must be horizontally placed at 0
o
(check position with a level
and with its indicator plate).
2. Place SID at 1 meter.
3. Position the Collimator Test Tool (RMI model 161B) on the Bucky
Table-Top.
4. T urn on Collimator light and center the Collimator Test Tool with the light
axes projected by the Collimator Lamp.
5. Place centered the Beam Alignment Test Tool (RMI model 162A) on the
Collimator Test Tool and observe if shadow of the Beam Alignment Test
Tool is projected in equal proportion around it.
6. Check on the processed film the adjustment required to center the top
ball mark. Shadow around the Beam Alignment Test Tool can also help
to make a first correction.
7. Loosen slightly the four Safety Screws (Allen M8) of the Tube-Collimator
Assembly. If required, perform the following adjustments:
G For horizontal correction move horizontally the Tube-Collimator
Assembly before tightening the four Safety Screws.
G For vertical correction loosen or tighten carefully the four Leveling
Screws (Allen M6) of the Tube-Collimator Assembly before
tightening the four Safety Screws.
G Angle correction is factory adjusted and it is recommended do not
perform any additional correction. If needed, loosen slightly the
two Safety Screws of the Pivoting Locking Ratchet and adjust very
carefully the two Setscrews of the Ratchet to position left right the
Lock Tooth. After adjustment, tighten the two Safety Screws
again.
8. Repeat exposure and procedure until the result is satisfactory (top ball
must be inside of the first circle).
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