MIDI Stream from inputs 08-15

[istan]

Hello,

if i powerup my megadrum, it beginns to send an Midi stream of NoteOn and NoteOff. First a NoteOff is sended, then a NoteOn of the ANote on the same input, by all inputs from 08-15, (If i change the Midichannel its sorted nearly by channel). Then its reversed and a NoteOff of the ANote is send , then a NoteOn of the Note. Sometimes the stream ends after a while. After restarting the changes i made are gone.

I didn't find any bad solderings. I tried it without the second 74HC4851N, but nothing changes. A year ago i updated the firmware. I wasn't able to test my megadrum until today and now i cannot update the firmware because of an unknown error (probably the stream). I have an ATMEGA644 with 20 MHz and a board by synthex.

How can i fix this Problem?

Thanks
Tobias

Code: Select all

Time                          input          Channel Note Vel
19:20:29.818   From Anschluss 1   8  ANote Off   10   51   0
19:20:29.858   From Anschluss 1   8  Note On   10   50   127

19:20:29.859   From Anschluss 1   9  Note Off   10   52   0
19:20:29.860   From Anschluss 1   9  ANote On   10   53   127
19:20:29.862   From Anschluss 1   10  Note Off   10   54   0
19:20:29.863   From Anschluss 1   10  ANote On   10   55   127

19:20:29.864   From Anschluss 1   11  ANote Off   10   57   0
19:20:29.866   From Anschluss 1   11  Note On   10   56   127

19:20:29.867   From Anschluss 1   12 Note Off   10   58   0
19:20:29.868   From Anschluss 1   12 ANote On   10   59   127
19:20:29.869   From Anschluss 1   13 Note Off   10   60   0
19:20:29.870   From Anschluss 1   13 ANote On   10   61   127
19:20:29.873   From Anschluss 1   14 Note Off   10   62   0
19:20:29.881   From Anschluss 1   14 ANote On   10   63   127

19:20:29.884   From Anschluss 1   15 xNote Off   10   41   0
19:20:29.967   From Anschluss 1   15 xNote On   10   41   127


19:20:29.971   From Anschluss 1   8  Note Off   10   50   0
19:20:30.010   From Anschluss 1   8  ANote On   10   51   127

19:20:30.012   From Anschluss 1   9  ANote Off   10   53   0
19:20:30.013   From Anschluss 1   9  Note On   10   52   127
19:20:30.015   From Anschluss 1   10  ANote Off   10   55   0
19:20:30.016   From Anschluss 1   10  Note On   10   54   127

19:20:30.016   From Anschluss 1   11  Note Off   10   56   0
19:20:30.019   From Anschluss 1   11  ANote On   10   57   127

19:20:30.020   From Anschluss 1   12  ANote Off   10   59   0
19:20:30.021   From Anschluss 1   12  Note On   10   58   127
19:20:30.022   From Anschluss 1   13  ANote Off   10   61   0
19:20:30.023   From Anschluss 1   13  Note On   10   60   127
19:20:30.026   From Anschluss 1   14  ANote Off   10   63   0
19:20:30.034   From Anschluss 1   14  Note On   10   62   127

19:20:30.036   From Anschluss 1   15  xNote Off   10   41   0
19:20:30.119   From Anschluss 1   15  xNote On   10   41   127



[dmitri]

You have either bad soldering or incorrect resistor value on the ADC input of inputs 8-15.

[istan]

Thank you.

The soldering of the resitor was bad.

But now the next problem appeared.
On the startscreen the top left was black.

I tried to update the firmware with MDM on OSX, but it failed. ('connection failed')Then i tried it on Windows XP. There was a connection to the Megadrum and i got the values for single inputs. But when trying get all, MDM hung up. Updating the firmware didnt worked. (nothing happend, alway 0%). I tried it with mdfwupdate. it loaded 4% and then CRC Error. And now i dont have any firmware. blank screen, when plugging in Megadrum.

Now i dont know what to do?

regards
Tobias

[dmitri]

You have to load the firmware using mdfwupdate. If it fails at 4% or some other number above 0% then you have an intermittent problem on your board - bad soldering, incorrect resistors values, bad contacts.