strange On/Off events when pushing a button

Testing/Troubleshooting
1

Hi there…

Testing my second MidiboxLC-Unit, I got some strange “DIN” - behaviour. On the first 4 Shiftregister are buttons they produce very much On/Off - Events when I push the button, instead of one NoteOn when" pushed" and one NoteOff wen “pulled”.

Here a little overview  :

x  =  button doesn’t work

m = button has much events

o = button works ok

                                                                                                                               1  2  3  4  5  6  7  8

  1. Shiftregister   |m|x|m|o|m|o|o|o|

  2. Shiftregister   |o|m|m|m|o|o|o|o|

  3. Shiftregister   |o|o|m|m|o|o|o|o|

  4. Shiftregister   |m|m|x|m|o|o|m|o|

  5. Shiftregister seems to be ok

I got an idea that there is a shortcut to clock-line but i couldn’t find anything. :-/

Thanx for ideas what’s wrong

Pearl

2

Hi there …

Ok, it’s definetly a hardware-problem. I tried a new CoreBoard and everything is OK.

But I can’t find any mistake on the other board (same layout/same charge) .

Bye Pearl

3

strange think. have you tried to switch the ic’s and checked the connections of the buttons?