Vintage Synth Repair

Hi, Scott,


few weeks ago I have fully disassembled, cleaned and repaired non  
working CP35, these E pianos deserve to be used, the quality of the  
keyboard is just unbelievable for that time (the same as on my CS80) -  
I have disassembled it as well. Yamaha even used very small pieces of  
plastic for keys which sit lower, to balance the key level! I didn't  
know and almost lost them... My instrument had more issues but now  
it's fully working.


I'm afraid I can't give any advice  concerning CP30, available Service  
manual (in two parts) is not so good as that one for CP35 and circuits  
I can see are different than in CP35.


Best regards!


Daniel Forro




On May 10, 2016, at 9:58 PM, painintheamp@...  
[vintagesynthrepair] wrote:

>
>
> While this isnt a synthe, per se, it does have many of the same  
> circuits as analog sythe stuff. That brainstorm said: There's  
> waterfall noise in the audio on this unit. It's down to the stereo  
> audio amp PCB.  I replaced that four transistors in the two circuits  
> to no avail.
>
> Any ideas to make Mr Big Noise go away?
>
>
> Thanks ,
>
> Scott at Audio-Fixation , Vermont

It looks similar but maybe it is not 100% same or exchangeable. My  
CS80 is still waiting for restoring work, I didn't open it few years  
so I'm not quite sure about this. Now I know well how CP35 keyboard is  
made but haven't yet studied about CS80 keyboard.


I'm sorry I can't give you more details recently.


Daniel Forro




On May 12, 2016, at 5:35 AM, marcmarc@... [vintagesynthrepair]  
wrote:

>
>
> Hi Forro,
>
> Interesting to read about your work on the CP35.
> I'm restoring a CS80 right now in Amsterdam.
> This one has tortured key contacts.
> Are the keycontact boards and contacts exactly the same as with the  
> CS80?
>
> Best regards,
>
> Marc Marc