Yamaha CS80

> > Last: can the two tantalium blue caps in the KAS (1uF and 22uF) be replaced with two simple electrolytic, more reliable ones? 
> 
David, you did not reply  :-)
Is it better to replace them? 

> > BTW, I replaced all of the trimpots both in the KAS and SH with 8x2= 16 perfectly fitting 10K multiturn ones. The same done with the BA VR3 100K one (calibrating the 4.00 ref Voltage) = great!
> 
To whom it may concern: 
The right replacement from the (italian) catalogue of RS components is   
125-742	 	

TRIMMER T93YB 10K
.

> 
> Great ! Any good replacements for the various M-card trimmers? Obviously, the 4 for tuning, but if I ever do a full 16-card calibration again, I'd want to replace all trimmers since many of them are way to sensitive.
> 
> 
Would be great!   Calibrating those screws is a delight...    :-)
If anybody  already did that, please let us know where to go for those components...









> > 
> > 
> > 
> > 
> > Il giorno 05/apr/2011, alle ore 14.33, Andrew Kirkby ha scritto:
> > 
> >> Hi Max,
> >> 
> >> Personally i'd just add decoupling caps and replace ALL the CMOS in 
> >> the unit with new TI stuff. All the old CMOS in the unit will fail - 
> >> i'm actually surprised it has lasted this long. CMOS is pretty cheap 
> >> though if you are using good quality Mil-Max machined sockets the cost 
> >> increases by a rather a large amount :) Also, if you replace all of 
> >> the parts in the PSU with new ones you can basically avoid the root 
> >> cause of all these issues. I'd also check all of the voltages with a 
> >> very high precision multimeter if possible, just to get it spot on.
> >> 
> >> In any case, you will get a CS80 that will be inherently more reliable 
> >> or at least a lot closer to how it was out of the factory.
> >> 
> >> 
> >> Andrew
> >> 
> >> On 05/04/2011, at 4:56 PM, max fazio wrote:
> >> 
> >>> Hi Andy
> >>> I've read somewhere about a custom project which enabled to isolate 
> >>> the most critical points (KAS, SH, TKC) from occasional shocks and 
> >>> PSU failures; anyway it looks pretty foggy to me, as I've read about 
> >>> it many years ago and lose the documentation! Did you have some more 
> >>> infos?
> >>> Thx
> >>> M
> >>> --- In yamahacs80@yahoogroups.com, kirkbyte@... wrote:
> >>>> 
> >>>> Hi Max,
> >>>> 
> >>>> That is good news. Just as i had suspected...
> >>>> 
> >>>> Where do you want to put more fuses?
> >>>> 
> >>>> Andrew
> >>>> 
> >>>> 
> >>>> 
> >>>>> max fazio <faxiomas@...> wrote:
> >>>>> 
> >>>>> Hi all
> >>>>> Happily we solved the problem: 2 4016 CMOS brought their soul 
> >>> back to
> >>>>> the Almighty but , at least, no other problem was found; can 
> >>> anybody
> >>>>> tell me about how to modify the tracks in order to be able to 
> >>> put more
> >>>>> fuses?
> >>>>> Thx
> >>>>> --- In yamahacs80@yahoogroups.com, "Max Fazio" <faxiomas@> wrote:
> >>>>>> 
> >>>>>> Hi
> >>>>>> 
> >>>>>> Sounds like some CMOS shorted out. Which fuse blew?
> >>>>>> 
> >>>>>> Apparently the one on the left if you look from a higher pov 
> >>> with the
> >>>>> keyboard in front of you
> >>>>>> Update: now tensions are regular, those with scary settings 
> >>> are the
> >>>>> ones between KAS and SH
> >>>>>> M
> >>>>>> 
> >>>>>> 
> >>>>>> ----- Original Message -----
> >>>>>> From: Andrew Kirkby
> >>>>>> To: yamahacs80@yahoogroups.com
> >>>>>> Sent: Sunday, April 03, 2011 4:32 PM
> >>>>>> Subject: Re: [yamahacs80] Help! Note mess!
> >>>>>> 
> >>>>>> 
> >>>>>> 
> >>>>>> Sounds like some CMOS shorted out. Which fuse blew?
> >>>>>> 
> >>>>>> Sent from my iPhone
> >>>>>> 
> >>>>>> On 04/04/2011, at 12:27 AM, "max fazio" <faxiomas@> wrote:
> >>>>>> 
> >>>>>>> Hi all
> >>>>>>> I'm writing on behalf of Fernando who's got another problem 
> >>> with
> >>>>> his machine which was eventually about to be fully restored.
> >>>>>>> While removing one board in the voices' rig, one of the fuses
> >>>>> suddendly blew up and the main voltage jumped to +20V. After he 
> >>> restored
> >>>>> the correct voltage he experienced all kinds of weird sounds 
> >>> coming off
> >>>>> the CS-80.
> >>>>>>> I only hope that the KAS didn't break up, so please can you 
> >>> give
> >>>>> me any advice or diagnosis about this problem.
> >>>>>>> please help
> >>>>>>> M
> >>>>>>> 
> >>>>>>> 
> >>>>>> 
> >>>>>> [Non-text portions of this message have been removed]
> >>>>>> 
> >>>>>> 
> >>>>>> 
> >>>>>> 
> >>>>>> 
> >>>>>> [Non-text portions of this message have been removed]
> >>>>>> 
> >>>> 
> >>> 
> >>> 
> >>> 
> >> 
> >> Andrew Kirkby
> >> (e) kirkbyte@...
> >> (m) 0416 000 070
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> [Non-text portions of this message have been removed]
> >> 
> >> 
> >> 
> >> ------------------------------------
> >> 
> >> Yahoo! Groups Links
> >> 
> >> 
> >> 
> > 
> > 
> > 
> > ------------------------------------
> > 
> > Yahoo! Groups Links
> > 
> > 
> > 
> 



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