Vintage Synth Repair

Hi Fran,

Thanks for the quick reply. I think I am going to have to bite the 
bullet and strip out those offending keys to check that region out. 

Cheers, 

Andrew.

--- In vintagesynthrepair@yahoogroups.com, "narfman96" 
<narfman96@...> wrote:
>
> Andrew, The D5 has a membrane style plastic film for key contacts. 
Have 
> you checked for dirt and/or corrosion between the film layers? I 
can 
> look at the D5 in my shop if you need more details. It's been a 
while 
> since I was inside it.
> Let me know, Fran
> 
> --- In vintagesynthrepair@yahoogroups.com, "aent440" <andrew@> 
wrote:
> >
> > Hi, the top 5 keys (intermittently) fail to sound on my D5. I can 
> > always see a time multiplexed signal for each key on the main 
board 
> and 
> > can just about see a difference in pulse width when the second 
> velocity 
> > contacts come in (but not as pronounced as for the working keys). 
I 
> > have a paper copy of the service manual but it does not describe 
the 
> > keyboard. Does anyone have a description or schematic of the 
keyboard 
> > operation please? Thanks in advance, Andrew.
> >
>