avio@superherc Posted May 22, 2013 Share Posted May 22, 2013 Recently we had a Mission Computer failure. The data bus channels checked good, finally after much struggle we were able to locate the problem. On the J6 (p1569A) connector pins 39 and 40 were open. Those pins are to be spliced to a common ref. ground. We solved the problem but have no clue why the short circuiting of those pins so important. I'd appreciate it if anybody could explain it. Quote Link to comment Share on other sites More sharing options...
Spectre623 Posted May 24, 2013 Share Posted May 24, 2013 (edited) self deleted Edited May 24, 2013 by Spectre623 Quote Link to comment Share on other sites More sharing options...
C130J-MQTP Posted June 7, 2013 Share Posted June 7, 2013 J6 on the Mission Computers is a program plug. A lot of the avionics on C-130Js are commercial off the shelf COTS or have redundant systems. It let's an LRU know what position it's in #1 vs #2, what remote terminal address to use for the data, and other data depending on how configurable the manufacturer made it. For example that's how the pilot's interphone control panel knows it's in the pilot's position when sending commands to the CSU. If you've seen any of the old PMA cases there is this small metal plug (or long red cable/plug made of the same material as the PMA cables) that they don't use anymore. That plug used to be used on J6 for loading software to the CNI-SPs because without it the MCs wouldnt know that they need to take over as bus controller for the com/nav busses. Quote Link to comment Share on other sites More sharing options...
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