Some troubles w/ MB64...

Testing/Troubleshooting
1

Hi there.

I’m having few troubles…:

  • First of all, it does send something to midiout, when using in sequencer mode, but dunno what…=( My MC-505 went crazy, when I plugged it…My computer is kinda broke at the moment, so I can’t do midimonitoring with it…I have checked, and doublechecked whole pcb, no success so far…

  • How should those F1-F4 buttons act…? I push them, and yes, LED turns on, but it goes of when depressing. I used push buttons, like schemo said…Please don’t tell me, I need to use toggle switches or something like that…=/

  • And last, my MB founds 16 banksticks…No BS’s connected…=/ Hmm…Well, when it founds one, it erases all settings…=(

Thanks in Advance!

Matti

2

I already answered via EMail, here a copy for the records:

just a quick but (hopefully :slight_smile: helpful answer: it seems that you didn’t

solder a 1k pull-up on pin RA4 of the PIC. This resistor is absolutely

required, otherwise the firmware cannot determine if a bankstick is

connected or not.

You will find the pull-up resistor as R2 here

http://www.ucapps.de/mbhp/mbhp_core.pdf - the schematic will help you to

locate the correct pin.

Another important hint: the serial input pin of the last 74HC165 requires

a 10k pull-up resistor. In http://www.ucapps.de/mbhp/mbhp_dinx4.pdf

 you will find this resistor as R36. Without this pull-up, the box

will send random button events.

Best Regards, Thorsten.

3

Hi there!

Yeah, guess what. You were right, 1k resistor from pin 6 to Vcc was missing…It wasn’t drawn in Greg’s PCB…I also had  _really_ old schematics, it wasn’t there either… :-/My mistake. I looked newer schematics, and there it was. What an idiot I was! Well, these things happends…

Now it’s working like a dream! I tweaked last night, and…OH MY GOD. I felled in love. As I’ve always been analog-freak, this thing is really for me. Thanks Thorsten!

I’ll try take some photos from it, as soon as I can get digi-cam from somewhere… ;D

mle.