[sdiy] Ticking noise from Yamaha CP60M piano

[Gil W.]

Thanks everyone,

Well, I re-soldered all joints at the output board (where I replaced the caps) but the hiss is still there, but again, only when engaging an external effect on either of the available effect loops (A or B).

Interestingly enough, if I only plug a cord which connected the Send to the Return (no actual effect unit preset), no hiss is heard at all...

I wonder if the caps should be Audio quality caps, which might make the difference ?

Here is the schematics including the caps I replaced...

http://www.fileden.com/files/2006/10/13/285304/cp60m.pdf   (Page 22)

http://www.fileden.com/files/2006/10/13/285304/CP60M%20caps.JPG

http://www.fileden.com/files/2006/10/13/285304/CP60M%20PS.JPG




--- On Fri, 12/12/08, Tom Wiltshire <tom at electricdruid.net> wrote:

> From: Tom Wiltshire <tom at electricdruid.net>
> Subject: Re: [sdiy] Ticking noise from Yamaha CP60M piano
> To: gil_we at yahoo.com
> Date: Friday, December 12, 2008, 11:15 AM
> Gil,
> 
> On 11 Dec 2008, at 22:55, Gil W. wrote:
> 
> > OK I just noticed that ticking noise disappears if I
> disconnect the  
> > MIDI cable from the the piano MIDI Out jack... could
> this be a  
> > ground loop ?
> 
> MIDI was optocoupled exactly for that reason - it should
> make ground  
> loops impossible. So no, unlikely.
> 
> > But how about the loud hiss noise when engaging an
> effect loop ?
> 
> Now *that* could be a ground loop! Or it could just be a
> broken  
> ground on one of the sockets too.
> 
> T.
> 
> >
> >
> > --- On Fri, 12/12/08, Gil W. <gil_we at yahoo.com>
> wrote:
> >
> >> From: Gil W. <gil_we at yahoo.com>
> >> Subject: [sdiy] Ticking noise from Yamaha CP60M
> piano
> >> To: "synth-diy at dropmix.xs4all.nl"
> <synth-diy at dropmix.xs4all.nl>
> >> Date: Friday, December 12, 2008, 12:30 AM
> >> I had my CP60M electroacoustic piano regulated,
> and replaced
> >> 6 electrolytes caps at the output board. Once
> installing the
> >> unit back,
> >> I noticed two problems which I didn't notice
> before:
> >>
> >> - There will always be a ticking noise heard in
> the
> >> background.
> >>
> >> - When engaging an external effect pedal (using
> the effect
> >> loop send/return) a very loud hiss noise will be
> heard...
> >>
> >> I double checked the caps values and orientation
> so I'm
> >> pretty sure this could not be the source for the
> problem...
> >>
> >> Can anyone think of anything else ?
> >>
> >> You can listen to this behavior in the following
> audio clip
> >> that made:
> >>
> >>
> http://www.fileden.com/files/2006/10/13/285304/CP60M%20sound%
> 
> >> 20problems.mp3
> >>
> >> Thanks !
> >>
> >>
> >>
> >> _______________________________________________
> >> Synth-diy mailing list
> >> Synth-diy at dropmix.xs4all.nl
> >>
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >
> >
> >
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at dropmix.xs4all.nl
> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >