GE HEALTHCARE
DIRECTION 2307224-100, REVISION 6DISCOVERY LS SYSTEM SERVICE MANUAL
Page 256 Chapter 8 - System QC, Calibration and Functional Tests
8.1.2.4 Aligning the Gantry
1.) Raise the Gantry left side dolly until the front high-load roller clears the floor (5 mm minimum).
Note: When raising the Gantry, always lift the left side first and lower it last.
2.) Raise the right side gantry dolly (when viewed from the front of the gantry) until the linear
bearing adjusters lift approximately 1 cm off their spherical washers. Do not raise too much to
enable easy return.
3.) Based on the results of the gantry VQC report, align the gantry adjusters and the base plates
as follows:
a.) Remove the screw from an adjuster, turn the locking ring together with the adjuster the
necessary amount, and then replace the screw into the nearest hole to the locking ring’s
new position.
b.) Note that clockwise or counterclockwise adjustments are defined when viewing the
adjusters from above.
c.) Note that base plate x-axis alignment screw adjustments are defined when viewing the
screw from the outer side of the base plate and that screws are arranged in pairs so that
rotation of the outside screw must be performed together with a proportional counter
rotation of the inner screw.
4.) Tighten the base plate screws that were previously loosened.
5.) Lower the right side gantry dolly until the spherical washers (shown in Figure 8-17) fit tightly
into each other.
Figure 8-17: Spherical Washers
6.) Lower the left side gantry dolly until the high-load rollers are seated firmly on the baseplate.
7.) Tighten the securing screws on the linear bearing assembly adjusters (shown in Figure 8-14).
8.) Tighten the locking rings on the two linear bearing assembly adjusters and the front high-load
roller (Adjusters 1, 2, and 3 in Figure 8-16).
9.) Move the gantry back and forth to allow the spherical washers to align inside the adjusters.
10.) Repeat Step 7 and Step 8.
Spherical Washers
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