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PostPosted: Thu Apr 27, 2017 9:19 pm 
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Hi

I have just bought a used K8400 and tried to update the firmware.

When trying to load the firmware to the printer I get the error message that the "com3 is allready in use. Please unplug any other unit using Com3".
The problem is that nothing else is connected to Com3.
I have tried to restart the computer without any luck.

Please help.


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PostPosted: Mon May 01, 2017 3:33 pm 
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Did you use Arduino software 1.0.6 or lower?
Did you put the jumper on Jprog?


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PostPosted: Mon May 01, 2017 3:36 pm 
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Hi Wrong Way

Yes and yes :-)


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PostPosted: Mon May 01, 2017 3:56 pm 
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This is strange.
When Device manager is open and you unplug the printer does the com port go away?


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PostPosted: Tue Jun 13, 2017 8:48 am 
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Hi,
I have exactly the same issue, finished building the K8400, by compiling firmware error message: "com5 is allready in use"
Arduino 1.0.6
Jprog jumper set
com 5 disappears when I disconnect printer.
Was there a solution for this issue?


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PostPosted: Tue Jun 13, 2017 10:44 am 
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Hi, it seems like the cause is internal port configuration in my laptop, because I repeated the hole procedure on another PC with success!
This problem is solved! Up to the next...


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