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Board occasionally looses RS connection

Posted by ax2013 
Board occasionally looses RS connection
May 22, 2014 01:15AM
Annoying problem which sometimes occurs during printing: board starts to send responds in wrong baud rate (as far as I can tell). All commands are executed in Marlin but nothing comes back to Pronterface.
First I thought MCU is defected so I replaced it. Then I replaced resonator to xtal. After that replaced FFT chip. Problem continues. I added cooling fan. No help.
Anyone else experiences of this? It is always frustrating but especially when you loose an item of a longer printing...
Recycling power fixes the issue. Even rebooting the controller does not help. (=possible not software nor MCU register issue)

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