[ICOM] 775 DSP- how to trouble shoot the rig control circuit?

[Michael Sell]

My 775 DSP quite responding to any rig control or software I try to use with
it. (DX4Win & Writelog)  Both work fine with my 746 so I know the computer,
software and cable to the rig are good.  I know how to set up the right
addresses, that not the problem.

I traced the connection of the jack on the rear panel to the main control
board for continuity, all checks good to that point.  When using a logic
probe, it does show activity of some kind at the jack.  Any suggestions on
how to troubleshoot this further?

Michael Sell
k0com at comcast.net

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