GE Medical Systems PRODIGY Service Manual page 101

Figure 3-4. enCORE Troubleshooting help screen capture.
How to use the Troubleshooting Help software:
This Help software is based on Fault Tree Analysis or FTA. The fault trees are
in an outline form. Each heading in the outline represents an "or" choice. For
example, the basic fault below "Shutter will not close" has three possible
causes: "Shutter stuck", "Solenoid Return Spring not working", or "Solenoid
powered when it should not be". Each of these in turn lists their possible
causes.
Sample Fault Tree (from Prodigy Collimator):
Shutter will not close
I.Shutter stuck – move by hand to test
A.Slotted Wheel scraping OMI board
B.Shutter scraping Shutter Plate
II.Solenoid Return Spring not working – move by hand to test
A.Spring broken
B.Spring no longer anchored
III.Solenoid powered when it should not be
A.FOINK (PRODIGY I) problem – Test by disconnecting J1. If the shutter
closes, swap the SBC. If the shutter stays open, swap the FOINK.
B.(c)SBC problem – Test as above.
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PRODIGY Service Manual (Rev C - 2000) Service Software3-111