Yamaha CS80 group photo

Yahoo Groups archive

Yamaha CS80

Index last updated: 2026-04-28 23:44 UTC

Message

Re: [yamahacs80] CS-50 Portamento/Glissando problem

2018-09-21 by Nigel Cruickshank

Where are you? 

Could be a tech nearby...

> On 21 Sep 2018, at 10:15 pm, sneakyflute@... [yamahacs80] <yamahacs80@yahoogroups.com> wrote:
> 
> Hi. I'm on tour with my CS-50 and one voice suddenly is stuck on Glissando (I can't switch it to portamento). I need to fix it fast before the next show...
> 
> 
> 
> I only have a meter and soldering iron (and limited knowledge and skills :) with me, so I'm hoping to just quickly swap in some new parts (can't do much testing). 
> 
> 
> 
> Is the issue likely to be the comparator IC (the 4069 inverter) in that part of the circuit (IC23), or is there something else I should target? Again, glissando works - so maybe the gate is stuck on?? I would like to try to make one stop or one order for parts before I attempt to do this, so it would be great to hear some of your guesses so I can get those parts before I go in. 
> 
> 
> 
> Thanks! DT
> 
> 
> 
>

Attachments

Move to quarantaine

This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.