e-licktronic Forum

I still trying fix my Bass Drum and find what wrong.
I found a lot interesting after hours) but dent find solutions for my kick(
I will post pictures, hope it will help for other Nava owners)

Snare Drum

Q43, Q46, Q49
Mixed Collectors and Emitters

Mid Tom

Wrong value for R124

Low Tom

Wrong value for C25

Hi Hat

Wrong value for R485

Great! Thanks!

Can you also explain further... mixed collectors and emitters?

Transistor pin swaped(emmiter to collector and colletor to emmiter)
You need see both schematics

peskado wrote:Transistor pin swaped(emmiter to collector and colletor to emmiter)
You need see both schematics

Ah, I see it now comparing Q43.
But, whould not this mistake make the snare sound totally screwed up? Or this mistake is not "critical" I guess? Or this is just a schematic error, but not on the PCB itself?

Have you also checked/compared the revision notes for the 909?

"
from #426700:
-TOM NOISE, C54 from 2.2nF to 4.7nF, R194 from 47k to 100k to emphasize the attack of the Toms"

reversed transistors critical mistake, we can try it) or wait 15 08)
I checked my nava board with dmm and it same with nava schematic.
I saw comments about tr909 pcb revisions and nava schematic look like last revision.
Do you have some more info about revisions?

Maybe these are errors in the 909 scheme? Since the 808 has errors in its scheme this is also possible for the 909?