Next episode:
I soldered some wires to MAX202 pins going directly to the CPU. I then connected a TTL/USB serial converter to these wires and were able to go into the menu of the TT4 and here it is, no more garbage !
Removed the wires and gave it a second try using the regular DB9 connector J2 on the tracker, and .... it is now working fine !... So I guess the actual issue were cold soldering on the MAX202 and countless years in a car broke them...
Next step is to test further if this was really the cause of the issue.
Picture of the test setup.
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Geoffrey F4FXL / KC3FRA
My Tinytrak Stuff =>
