Looking at the end of
the plug that goes into the 290 the pins are labeled, with the notch
at the top, the connection to the right is pin 1 , counting clockwise
connection 2 thru 6 (6 is to the left of the notch.) 7 centre
1mic earth and common
return for up/down button via lock switch and ptt, 2mic, 3ptt, 4 +5V,
5 spkr, 6 up button, 7down button
Hope this helps regards, Colin
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