Collimator Functional Checks And Adjustments; Cross Hair Position Check And Adjustment - GE AMX-II Service Manual

GENERAL ELECTRIC MEDICAL SYSTEMS AMX-ll X-RAY UNIT
7-1576 SM A0654E
SECTION 14 COLLIMATOR FUNCTIONAL CHECKS AND ADJUSTMENTS
General
The collimator blade and shutter assemblies have been factory aligned. The following adjustments, however,
should be checked and readjusted if necessary.
14-1 Cross Hair Position Check and Adjustment
Initial Conditions:
Main power circuit breaker - ON
X-ray generator standby switch - ON
Battery charge indicator green band
Charger cord disconnected
Position tube unit and collimator to project
light field on smooth surface such as a tile floor
at 40" (1.016 m) SID. Darken the room and
open the collimator blades.
Press the Field Light button on the collimator.
Field Light should energize and remain on for
15 to 20 seconds unless modified per Chapter
4, Part |, Section 3-2. Light pattern should be
of uniform brightness (no shadows or blotches)
with sharply defined edges, and approximately
squarely with the floor.
Slowly move each blade set toward the closed
position while observing the light pattern. The
illuminated area on the floor should show equal
rectangles of light on either side of the cross-
hair shadows as each set of blades is moved
toward the closed position.
If adjustment is necessary, proceed as follows:
a. Slightly loosen the two rear screws in each
cone track.
b. Slide the plastic window with the fingertips
or tap the frame with a screwdriver until
alignment is satisfactory.
c. Retighten thecone track screws.
411-33
Note: The mirror should NEVER be moved.
22003-D20
ILLUSTRATION 4-11-41