9600 Service Manual - gmecorp-usa.com

Image System Calibration 35
C. Swing the "open iris" stop against the stop pin and tighten and Loctite 222 the
set screw. Do not over-tighten the set screw. Check gears to make sure they
move easily.
5. Increase the radiation level to 48.0 mR/minute (4 x the reference radiation level
previously established):
A. While taking an exposure increase the mA to produce a radiation level of 48.0
mR/minute.
B. If maximum mA is reached the kVp may be increased slightly but must not
exceed 75 kVp.
6. Set the iris and “closed iris stop” to produce 600 mV of video:
A. While taking an exposure adjust the iris to produce 600 mV of video (blanking to
peak) at TP10 on the Video Switching PCB.
B. Swing the "closed iris" stop against the stop pin and tighten and Loctite 222 the
set screw. Do not over-tighten the set screw. Check gears to make sure they
move easily.
7. Manually open the iris back to the "open iris" stop position.
8. Verify proper kV tracking by placing 1 mm copper filters (OEC P/N 00-877682-01) in
the beam (under collimator). The following specifications must be met:
1 copper filter = 60 kV ± 3kV
2 copper filters = 70kV ± 3kV
3 copper filters = 78kV ± 3kV
NOTE: After completing this alignment, proceed to the Pixel/Column Filter
Adjustment section.