Archive of the former Yahoo!Groups mailing list: Yamaha CS80

When probing cards, I put a sheet of A3 behind them and rest them on the rack. Seems to do the trick.

 

Thanks for the ideas! I like the table...when I pulled the card the first time I thought, "it would be nice to have a flat surface to work on!"

I did check the output of the VCO & waveshaper, they both work great, and track the keyboard. I'll move forward from there next.

thanks!
lee.

--- In yamahacs80@yahoogroups.com, rikard.latvala@... wrote:
>
> Hey,
>
> Do you have access to an oscilloscope ? Try probing the output of the filter ic
> Easiest way to do this is to solder a wire to the output pin or do as I did build
> a small table that goes over the "board rack" that way you can have the boards out
> and work on a flat surface while doing probing.
>
> I might have an image of my little special solution I can put it in the file section
> of the list.
>
> Anyway if you have signal at the output of VCF check at the VCA if you have both in and out.
> If i remember correctly VCA 1 is for sine and VCA2 for square&saw. Actually check all VCAs.
>
> If you have input but no output make sure the 3:rd voice gets trig input while playing
> the keys and that the Envelope actually works. If the Env doesn´t get trig check the
> 3:rd Transistor located on the KAS board right hand side in wards towards the "board rack".
> the transistor for the 3:rd voice is the third one from your left If you have nothing here next
> check the 4050 cmos ic. after this there is only the YM cpu & D/A ic´s from what i can remember.
>
>
>
> -----Originalmeddelande-----
> Från: leefordwatford@...
> Till: yamahacs80@yahoogroups.com
> Datum: 2013-12-03 00:45
> Ämne: [yamahacs80] Re: Hello, new member with a few CS-60 questions...
>
>     
> Hi, finally got a little time to try swapping filter chips around, same issue.
>
> I checked the trimmers, they seem okay, do I move on to wave shaper or oscillator? Is there a good way to work on these things? The socketed ICs were bad enough!
>
> --- In yamahacs80@yahoogroups.com, Bob Stewart <bob@> wrote:
> >
> > Might also be a filter chip failure causing the loss of square, saw and
> > noise. Try swapping the filter chips with another card to see if the fault
> > moves with the chip/s.
> >
> >
> > On Monday, November 25, 2013, Rikard Latvala wrote:
> >
> > >
> > >
> > > Hey,
> > >
> > > about the light bulb, check if a well stocked gas station has them,
> > > I think I've seen these 24v5w bulbs used in cars.
> > >
> > > If i remember correctly the squarewave output can be probed at TP4
> > > on the M-card, and VR12 adjusts its output level. The trimpots used in the
> > > CS 50/60/80 are in need of replacement, or atleast some adjustment
> > > from time to time.
> > >
> > >
> > > Skickat från min iPad
> > >
> > > 25 nov 2013 kl. 02:22 skrev "leefordwatford@<javascript:_e({}, 'cvml', 'leefordwatford@');>"
> > > <leefordwatford@ <javascript:_e({}, 'cvml',
> > > 'leefordwatford@');>>:
> > >
> > >
> > >
> > > Hi, thanks for the group, lots of good info!
> > >
> > > I recently acquired a CS60, that mostly works pretty well.
> > >
> > > The first, and easiest issue is to find out a modern replacement for the
> > > Touch Response light bulb. I'm having some trouble finding a 24v5w
> > > equivalent. The #1864 seems close, but is 28v, and I'm not even sure it is
> > > the correct base size.
> > >
> > > The only other issue I've found (other than the need for a good tuning
> > > touch-up) is that the 3rd voice does not pass Square, Saw, or Noise. The
> > > Sine wave works great, and all other cards work fully.
> > >
> > > Where can I start? I've read a few posts here about it possibly being the
> > > Wave Shaper or maybe the VCF or VCF master level?
> > >
> > > Thanks!
> > > lee.
> > >
> > >
> > >
> >
>