The problem is probably that your software isn't telling the IC-7000 to go into XMIT mode.
Check the settings in JS8CALL, see how it is doing XMIT / RCV switching, and check that whatever it does on the DATA port matches what the IC-7000 expects.? I'm pretty sure there _is_ a "PTT" line in both the 6-pin and 13-pin DATA jacks.
Unfortunately, Icom didn't put a "digital VOX" capability into the IC-7000.
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The tune button on JS8CALL software also does not cause modulation (radio does go to TX, controlled by CAT)
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Ahh -- if the JS8CALL "Tune" button puts the IC-7000 into XMIT mode, but there's no power output from the rig:
. . . Check that you're using the correct pin on the DATA jack -- I think it's called "MOD" (modulator input),
. . . and that you're in USB mode,?
. . . and, if there's a menu item that switches between MIC and DATA, that it's set to DATA.
.? ?Charles / va7cpc