GE CT-9800

GE MEDICAL SYSTEMS CT 9800 QUICK SYSTEM
Rev. 6 Direction 18000
6-10-14
Maximum allowable ISO height to coronal plane should be ± 3mm.
CAUTION: The alignment light adjustment screws must be handled carefully, i.e., do not
overtorque the screws. Failure to heed this caution, may cause damage to the
alignment light adjustments.
In general, the screw adjustments for setting up the left and right coronal lights are as follows. Refer to Ills. 6-10-
7 and 6-10-8:
--- Screws “A”, “B” and “C” can be turned the same amount in the same direction to set the height of the
reflected beam.
--- Screw “A” moves the beam in and out of the scan plane.
--- Screw “B” and “C” moves the beam up and down in the scan plane.
--- Screw “D” is used for locking down after the adjustments.
--- Screw “E” locks the disk lens in place.
--- Screw “F” is used to adjust the eccentric weight on the disc lens pendulum. This is used to eliminate the
beam scew.
--- Screws “G” are used for setting the height of the solenoid.
--- Screws “H” are used for setting the spring tension of the lens brake lever.
Proceed as follows to align the coronal lights:
1. Turn on the alignment lights.
2. Back out the locking screw “D” (Illustration 6-10-7).
3. If the beam is not reflecting off the mirror at all, then adjust screws “A”, “B”, and “C” together in the same
direction to move the mirror into the path of the beam.
4. With the teflon end of the laser light alignment tool at ISO, adjust screws “B” and “C” to center the left or right
coronal beam along the white stripe down the respective side of the laser light alignment tool (Ill. 6-10-2).
5. Adjust the eccentric weight “F” (Illustration 6-10-8) to obtain correct alignment of the left or right coronal
beam within the white stripe along the respective side of the alignment tool. The setting of the eccentric
weight “F” is used to eliminate any scew of the beam (i.e., the beam angulates upward or downward and,
thus, is not parallel with the scan plane).
6. When alignments are correct lock screw “D” carefully.
7. For the left or right coronal light, loosen the 2 “G” screws and adjust the solenoid bracket up or down until the
brake lever just clears the knurled outer diameter of the lens barrel after the alignment lights are turned on
(i.e., solenoid is energized and pulls in). Tighten the “G” screws when the solenoid bracket is positioned
correctly.