Re: TMD700 "Opening TNC"

Pete AE5PL

I know this is an old thread but no one seemed to find a solution.  I had this happen this week on my D700 and tried everything suggested (terminal commands, hard reset, soft reset, all sorts of resets) with it still sticking Opening TNC when trying to go into TNC mode which is first APRS mode.  I did find a solution that got my D700 back working normally but it takes the ability to take both covers off, slide the front bezel off, and reset the TNC manually.

Unplug all cables from the D700.

Remove top and bottom covers and then remove the front bezel (bezel is held on by 3 tabs on the top and 3 tabs on the bottom that latch over the main chassis).

On top under where the back of the bezel used to be is a small circuit board with a flat cable coming out of the top left (as you look at it from the front) that connects it to the main circuit board.  Your goal is to disconnect the cable and reconnect it without breaking the connector or the cable.  This fully resets the TNC and will allow it to work normally.

To remove a flat cable from a circuit board, you have to release it from the connector.  The connector for flat cables is 2 pieces, one that is fixed to the circuit board and a second which is on top of the flat cable and faces the flat cable.  GENTLY use a small screw driver to evenly push this second piece away from the fixed piece of the connector.  It is NOT removable, only push it out far enough to be able to EASILY pull the cable out from the connector.  Once you have fully disengaged the cable, push it full back into place followed by gently pushing the top of the connector back in place.  Once it is secure, put the bezel back on followed by the top and bottom, re-cable, and power on.  You will have to reset the time and date as that was lost with the TNC hard reset.

Hope this helps you save some money in needless repair costs!  I definitely recommend this only if the other solutions don't work as you can potentially break the connector, cable, etc. if you are not gentle.


Pete AE5PL

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