Hehe... that's a 0.22 cap on my schematic!
Maybe that's another for David and the list of schematic inacuracies?
Cheers,
TOM
--- In yamahacs80@yahoogroups.com, Fernando Zarone <fernandozarone@...> wrote:
>
> >
> > Congratulations on fixing her...!
> >
> Thanks!!!
>
> >
> > So please can you confirm that you say this fault you just fixed on the M21 board - looks like it was a "dry solder joint"...?
> >
> Definitely. I guess there is plenty of those everywhere.
>
> >
> > (By the way I can't actually find a .001 cap between the pins of IC1 on the schematic...!)
> >
> Sorry for the typo, it is between pin 8 and ground...
>
> Ciao!
>
>
>
> >
> > Cheers,
> > TOM
> >
> > --- In yamahacs80@yahoogroups.com, Fernando Zarone <fernandozarone@> wrote:
> > >
> > > Dear friends,
> > > CS-80 is gorgeous, but IMHO it needs a certain ability in electronics if you don't want to get crazy and want to live happy. Moving the rack with the boards and calibrating them can be somewhat devastating, like a neuro-surgical intervention ... :-)
> > > Moreover, you do need spares for the custom ICs(I have some of them for the future life of my 3yrs old kid Mattia, if he wanted to play analogue). To make a long story short, if you don't know how to use at least a DVM and a soldering iron, ... give up or become a good friend of a skilled tech.
> > >
> > > Yesterday eventually I found why the M21 didn't work. Going back to the roots of the problem ( a negative voltage that paralized the M21) I arrived at the TRIG 4, IC 1, being VEEERY hot. I removed an (apparently) innocent and sound green, rectangular cap 0.001, between two pins of the 151 and: M21 is back again! I resoldered it and now it is ok. I ask you what the reason could be why such a negative tension on the pin 8... can a faulty contact determine such a problem?
> > > Now the machine is fixed, I am happy.
> > > And for this reason I wanted to thank all of the list members, prestigeous names like David and Kent included, I wouldn't have come to such a result without your precious help! Last but not least, here in Italy: thank you Tommy (selling your CS to me you gave me a unique opportunity of enjoying one of the best machines ever...) and Max (for sharing the nights chatting on the pc about the sick CS...)
> > >
> > > Ciao
> > > Fernando
> > >
> > >
> > >
> > >
> > > Il giorno 22/feb/2011, alle ore 08.52, Max Fazio ha scritto:
> > >
> > > > Hi Tom
> > > > Don't be so skeptical...there are spare parts and full machines from time to time on the market (a friend of mine bought , not so much time ago, some vital parts like KAS, 2 voices and some levers/sliders from a crazy man who had a full working CS60 while preferred to cannibalize it...sometimes people are outta this world), you only have to be there at the right time!!
> > > > M
> > > > ----- Original Message -----
> > > > From: Quazimodo
> > > > To: yamahacs80@yahoogroups.com
> > > > Sent: Monday, February 21, 2011 11:23 AM
> > > > Subject: [yamahacs80] Re: My own CS-80
> > > >
> > > > No Max, the PSU's on both my CS80's have been totally uprated with new caps, and IC's! I think it's just the luck of the draw - personally I don't think these custom chips are ∗that∗ solid, that's why I bought my CS70M - it has 12 VCO chips inside plus a few others... VCA, Filter etc... unfortunately it don't have the 152 VCF-EG chips...;c(
> > > >
> > > > I love the thing, just love playing it - but have resigned myself to acepting that one day it won't be working as I have had to start removing parts!
> > > >
> > > > This is why I was and am so interested it Old Crow's project of recreating the entire 'M' board. Hell, just a retro-153 VCO chip would do me! How's is Scott getting on with that project anyone know? Scott, are you there?
> > > >
> > > > --- In yamahacs80@yahoogroups.com, "Max Fazio" <faxiomas@> wrote:
> > > > >
> > > > > Aw, that's really painful to me,Tom!
> > > > > Have you found any wrong tension into the correspondent voice cards so you can locate the problem to faulty resistors or, worse, PSU?
> > > > > M
> > > > > ----- Original Message -----
> > > > > From: Quazimodo
> > > > > To: yamahacs80@yahoogroups.com
> > > > > Sent: Monday, February 21, 2011 10:35 AM
> > > > > Subject: R: [yamahacs80] Re: My own CS-80
> > > > >
> > > > >
> > > > >
> > > > > Could be just me Max - I've always said: "if it wasnt for bad luck I'd have no luck at all...!"
> > > > >
> > > > > Actually, one of my 80's has had the 4 VCO chips blow. The other has the two VCO's that won't 'scale' and I think both have blown a VCF-EG chip. Still need to investige the latest fault on the one downstairs.
> > > > >
> > > > > Cheers,
> > > > > TOM
> > > > >
> > > > > --- In yamahacs80@yahoogroups.com, "faxiomas@" <faxiomas@> wrote:
> > > > > >
> > > > > > Hi Tom!
> > > > > > That's sounding new to me: all the people I know who owned or has a CS in their ballpark had very few problems with the custom iCs: if my memory serves me well, only a friend from Germany suffered from a VCA malfunction years ago but luckily fixed it; in all other cases just CMOS, caps, PSU issues but nothing that needed a full replacement of the custom chips, a friend of mine from Italy had 4 CS80, sold many of them, restored all of them, each one had few or no problem to ICs ; did the not-so-in-full-shape baby had another owner? Sometimes-it happens also with super modern hi-tech devices of today- it could have simply be born under a bad star...it sometimes happens :-(
> > > > > > M
> > > > > >
> > > > > > ----Messaggio originale----
> > > > > > Da: noddyspuncture@
> > > > > > Data: 20-feb-2011 17.06
> > > > > > A: <yamahacs80@yahoogroups.com>
> > > > > > Ogg: [yamahacs80] Re: My own CS-80
> > > > > >
> > > > > >
> > > > > >
> > > > > > ----Messaggio originale----
> > > > > > Da: noddyspuncture@
> > > > > > Data: 20-feb-2011 17.06
> > > > > > A: <yamahacs80@yahoogroups.com>
> > > > > > Ogg: [yamahacs80] Re: My own CS-80
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > Hey Max,
> > > > > > In my CS80's it's the custom chips that I have had the most problems with!! Up to now I have had 4 VCO chips and two VCF-EG chips blow. Many years ago I had a tantalum on one of the TSB boards go short (blowing a fuse every time a certain Bb key was hit... a real bugger to trace that was!)... and currently in one of my 80's I think I have a couple of VCO chips that don't scale perfectly during the tuning procedure. They work and play OK but are also probably on their way out...!?! Oh, and one preset bulb needed replacing...;c)
> > > > > >
> > > > > > Cheers,
> > > > > > TOM
> > > > > >
> > > > > > --- In yamahacs80@yahoogroups.com, "Max Fazio" <faxiomas@> wrote:
> > > > > > >
> > > > > > >... custom chips are robust so they are not too compromised by age going on,
> > > > > > >
> > > > > > > M
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