I don't understand your question and can't help you until you tell me which pins you checked. What pin on the 4051 on the TSB boards did you check? I wouldn't even bother trying to troubleshoot the aftertouch and velocity unless it was working OK before you replaced the 1uf Caps on the TSB1 &TSB2 boards.
It could be a lot of things. I would start by checking Pin 3 of the 4051 on the TSB1 & TSB2 boards. Each 4051 on the TSB1 & TSB2 boards is responsible for the the aftertouch and velocity for a group of notes on the keyboard. Pin three of each 4051 will sum the output of whatever notes are playing that the 4051 is responsible for. Try playing one note at a time corresponding to each of the 4051's and press down to engage the aftertouch. You will see the aftertouch voltage for the corresponding note if the 4051 is working properly and the N1, N2, N3 lines are working properly for the entire keyboard.
-Mike
--- In yamahacs80@yahoogroups.com, Fernando Zarone <fernandozarone@...> wrote:
>
> I replaced ALL of the ICs in the KAS, TKC, SH and ALL of the electrolytic 1uF caps in TSBs. Going to replace the tantalium with polystyrene ones.
> The Aftertouch and Initial touch only work in the last octave from C5# to C6 . Backwards from C5 to C1, nothing.
> On the 4051 pins after the key pressure the relative tension raises from 0 - -0,20 to 6 and more, so it should not be a matter of keyboard sensors.
> Could you please indicate how and where to check, considering that it seems to be a "global" problem. Any specific test? Which boards could be involved?
>
> Any help strongly appreciated...
>
> F
>
>
>
> > Caro Max,
> >
> > dopo una delle ultime mie performances (sto sostituendo tutti i capacitors e ICs e tirando fuori schede) l'AT e initial touch, con tutte le loro funzioni di pilotaggio, non vanno per nulla se non nell'ultima ottava, da C5# a C6.
> > da C5 in giù, nulla. Inoltre se senti, per es. i Brass, mi sembra di non sentire l'attack lento. Insomma, ci risiamo.
> >
> > Mi dai qualche idea sulle tensioni da verificare? devo ancora sostituire molti tantalio (con poliestere) nelle TSB, ma non credo che la causa siano loro. Si rompevano tutti, in entrambi i canali? deve essere a monte il problema! Le tensioni dell'AT dai tasti arrivano ai 4051, da -0,20 a 6V e più sui piedini, il che significa che ... Che significa???
> >
> > Aiutami, Max, altrimenti spenderò una cifra per spedirla da RL in England da Mr CS80 per farla rimettere a nuovo!
> >
> > Grazie, so che lo farai...
> >
> > PS mica sei un tecnico? se no te la mandavo subito :-))
> >
> > [Non-text portions of this message have been removed]
> >
> >
>
>
>
> [Non-text portions of this message have been removed]
>