Yamaha CS80

Perfect. Fluke are very good. 

I will have to investigate further. If you have the original trimmers there it is a good idea to change those with a high quality one (i use Bourns 25 turn cermet ones as replacement where possible) - the original ones will fluctuate with temperature and any movement.

I would definitely advise you to do the repairs (much as Gavin has done) before attempting a tune up.

AK




> dzlvs8@... <dzlvs8@...> wrote:
> 
> I have a good calibrated fluke multimeter but I don't have a scope.  
> What  
> problem do you think the offsets on the TKS board are causing?  The 
> tuning  
> differences when using the transpose buttons or the portamento?   
> 
> I'm thinking of replacing all the 4000 cmos chips on the tks and sh 
> board  
> and then seeing what's up but I feel the transpose tuning is a 
> calibration  
> issue (vr5-9 on tks board).  I really have no.clue on the portamento.
> 
> Sent via DROID X on Verizon Wireless
> 
> -----Original message-----
> From: kirkbyte@...
> To: yamahacs80@yahoogroups.com
> Sent: Sun, Apr 17, 2011 07:35:14 GMT+00:00
> Subject: Re: Re: [yamahacs80] Making Progress but need HELP
> 
> Sounds like some of the TKS offsets are not right. Re-check with a good  
> 
> quality multimeter
> 
> Do you have a scope? I can tell you what might be wrong, but you will  
> probably need to trace it.
> 
> AK
> 
> 
> 
> > dzlvs8@... <dzlvs8@...> wrote:
> > 
> > I love you Andy!   I've only got a few more issues before everything 
> is  
> > 
> > fixed now.  I'm still only able to get the other three oscillators in 
> > tune  
> > on one of the four octave setting.  I'm thinking ai just need to tweak 
> 
> > some  
> > stuff on the TKS board or I need to mess with VR1 on the voice card 
> for 
> > the  
> > note that doesn't sound good.
> > 
> > The other problem is that portamento doesn't work.  but its stuck on 
> > fast  
> > for one note and.is annoying.  I can't turn it off or change ramp 
> speed. 
> >   
> > Once in a great while I can mess with it and get it to do a long 
> > portamento  
> > slide but only once.  and only on that one note.
> > 
> > Any ideas on where to start looking?
> > 
> > Sent via DROID X on Verizon Wireless
> > 
> > -----Original message-----
> > From: Andrew Kirkby <kirkbyte@...>
> > To: yamahacs80@yahoogroups.com
> > Sent: Sat, Apr 16, 2011 23:39:28 GMT+00:00
> > Subject: Re: [yamahacs80] Making Progress but need HELP
> > 
> > I buy everything from Digikey (www.digikey.com) - the part number is  
> > 296-2036-5-ND
> > 
> > AK
> > On 17/04/2011, at 8:45 AM, dzlvs8 wrote:
> > 
> > > Well I have a stuck note and rooted it down to my 4016 IC. Luckily  
> > > online info helped me focus in that area and I verified that the 
> 
> 
> 
> [Non-text portions of this message have been removed]