Probably, it could be.
But I checked the solder points, refreshed them... seem ok.
Moreover: could a broken wire "lock" the output (pin 3) of 4051s ? shouldn't it be an internal processing, between the inputs (other IC pins) and pin 3?
Il giorno 21/apr/2011, alle ore 11.32, Quazimodo ha scritto:
> If you've been working on the TSB and/or TKC boards then I would suspect broken wires...!?!
>
> --- In yamahacs80@yahoogroups.com, Fernando Zarone <fernandozarone@...> wrote:
> >
> > Thank you Mike.
> > Some progress has been done.
> > I replaced all of the 1uF electro caps and all of the tantalium ones (the latter with polystyrene ones) in the TSB1 and 2. Decoupling caps were added to all of the CMOS ICs.
> > The problem is still there: last octave (from C5# to C6) exhibit a working AT, the others no.
> > News: I checked all of the voltages from the AT sensors of the keys, all of them are present at the single input pins of the 4051's corresponding to the single keys, I mean the stronger I press the key, the higher the voltage comes out, e.g. at the pin 2 of IC5 /TSB2 when I press C6, pin 5 when B5 etc. This means that the problem is not before the 4051s. When I check at the sum terminal (pin 3 of the 4051s) , the voltage is OK in the last 2 (IC 4 and 5 of TSB2), corresponding to the WORKING last octave) but it's missing at the other IC's pins 3, as expected.
> > I thought: the ICs are faulty. No, in that in the TSB2 I swapped IC 3 with the IC5 (working): the same - last octave keys / IC4 and IC5 = AT OK, the others no. This means that it cannot be blamed to faulty ICs!
> > I would like to understand whether the fault is in both TSBs (except at the level of the last two ICs of TSB2 - not that likely...) or somewhere outside, locking these voltages in both boards...
> >
> > I think this is an important clue.
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> > Il giorno 20/apr/2011, alle ore 23.34, Mike ha scritto:
> >
> > > 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
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> > > > > 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 gi�, 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 pi� sui piedini, il che significa che ... Che significa???
> > > > >
> > > > > Aiutami, Max, altrimenti spender� 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 :-))
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