k4600 XY card

Have you capped it and checked the solder on the connectors? There are some diodes and transistors there near the bottom that should be checked...
 
been capped and make it a common practice to reflow all the connectors on any k4600 chassis .i swapped out TR308 with no change. i will check the diodes.
 
For some reason i had at one point 2 working 4600 chassis including cards but the cards from one would not work on the other
 
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