GE Medical Systems PRODIGY Service Manual page 144

6.Lay the new cable bundle flat out on the floor. Locate the end with the (2) 16
pin connectors and the yellow and orange Lemo connectors, this is the end
that connects to the bulkhead, this is the end to start the install action from.
7.Locate the bulkhead on the scanner. There are (3) wire ties that hold the
cable bundle in place between the bulkhead and the cable track. Before
cutting any wire ties note the way the cable bundle is tied down and the way
the cable lays before it enters the cable track. The new cable must be
fastened in the same position and lay the same way.
8.Carefully cut the (3) wire ties between the bulkhead and the cable track with
your diagonal cutters. Disconnect the large RS232 connector (Detector Signal
Cable) by unscrewing the two screws on the connector.
9.Next disconnect the two white 16 pin molex connectors. These connectors
have a catch lock located in the center of the housing which must be
depressed to disconnect them from the bulkhead.
10.If you try to remove the cable bundle by pulling it back towards the cable
track you will notice a 3 conductor gray wire cable tied to the high voltage
cable bundle. This wire carries the transverse optical interrupt signal from the
front carriage (we will refer to this wire as the OMI cable). To find the location
of the OMI board and the front carriage follow the OMI cable. On your new
Cable bundle the OMI wire is connected through the bulkhead.
11.To remove the OMI cable push the x-ray tube head all the way to the
outside of the scanner (patients left side), then notice the clearance between
the front panel and the high voltage cable bundle connecting to the x-ray tube
head and the way the cables are tied down as you will need to wire tie them
back the same way.
12.Now you can cut the (4) large wire ties and the (2) small wire ties that hold
down the high voltage cable bundle and OMI cable. Then you can pull the
lower cable bundle back to where it enters the cable track.
13.Next take your small screw driver and pry open (20) of the cable track
plastic retaining clips that hold the cables into the track. These clips pivot at
the back of the cable track and can either be removed or left in the open
position so the cables can be removed.
14.Pull the old cable bundle out of the cable track towards the foot end of the
table.
15.Now install the (3) conductor OMI cable from the bulkhead to the OMI
BOARD. To do this you must remove the white 16 pin connector from the
bulkhead labeled bulkhead 2, this connector is a part of the upper cable
bundle and the new OMI cable will connect into this housing. Note the position
of the wire tie that holds the upper cable bundle in place and then cut it in
order to pull the connector out to install the OMI cable. Note the orientation of
the existing terminals in this bulkhead connector as they slide and lock into
the connector in one direction only. Where the wires enter the connector each
hole is numerically labeled. Put the green wire into hole # 11, and the black
wire into hole # 9, and the red wire into hole # 1.
5-158Service Procedures PRODIGY Service Manual (Rev B - 1998)