Yamaha CS80

Hi all
With your kind help , I need to know something about the variable resistors put in the keybed and bound to the aftertouch: according to the big diagram there are 3 of them for each key: in case I'm happening to service an 80 what should be the replacement for them? Ohmic value/tolerance?
Thanks for your help!
M

[Non-text portions of this message have been removed]

are they really variable??? I thought they were fixed resistors Max...and the carbonised rubber bridge piece squished down to bring them all into the circuit.


-----Original Message-----
From: Max Fazio <faxiomas@...>
To: yamahacs80@yahoogroups.com
Date: 05/19/2011 17:40
Subject: [yamahacs80] CS-80 keybed aftertouch resistors


Hi all
With your kind help , I need to know something about the variable resistors put in the keybed and bound to the aftertouch: according to the big diagram there are 3 of them for each key: in case I'm happening to service an 80 what should be the replacement for them? Ohmic value/tolerance?
Thanks for your help!
M

[Non-text portions of this message have been removed]








[Non-text portions of this message have been removed]

Hi Max,

Are you talking about the FSR (force sensing resistor)?

Those are the key and aftertouch sensor...

Andrew

On 20/05/2011, at 8:40 AM, Max Fazio wrote:

> Hi all
> With your kind help , I need to know something about the variable
> resistors put in the keybed and bound to the aftertouch: according
> to the big diagram there are 3 of them for each key: in case I'm
> happening to service an 80 what should be the replacement for them?
> Ohmic value/tolerance?
> Thanks for your help!
> M
>
> [Non-text portions of this message have been removed]
>
>
>

Andrew Kirkby
(e) kirkbyte@...
(m) 0416 000 070






[Non-text portions of this message have been removed]

Hi Laurie
yea, I mean, what if one sensor breaks? Could I be able to replace them? Also, my only doubt is that on the diagram it looks like there are three resistors put in series but I'm not sure what yamaha was trying to show there...??!!
+____+

M

----- Original Message -----
From: Laurie Curry
To: yamahacs80@yahoogroups.com
Sent: Friday, May 20, 2011 1:41 AM
Subject: Re: [yamahacs80] CS-80 keybed aftertouch resistors




are they really variable??? I thought they were fixed resistors Max...and the carbonised rubber bridge piece squished down to bring them all into the circuit.

-----Original Message-----
From: Max Fazio <faxiomas@...>
To: yamahacs80@yahoogroups.com
Date: 05/19/2011 17:40
Subject: [yamahacs80] CS-80 keybed aftertouch resistors

Hi all
With your kind help , I need to know something about the variable resistors put in the keybed and bound to the aftertouch: according to the big diagram there are 3 of them for each key: in case I'm happening to service an 80 what should be the replacement for them? Ohmic value/tolerance?
Thanks for your help!
M

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]





[Non-text portions of this message have been removed]

Hi Andy
Yes, the FSR , I was referring to the aftertouch sensors anyway...just I
find it odd that yamaha is reporting three resistor symbols for each key on
the diagram, where the aftertouch contacts are drawn...what could that mean?
M

----- Original Message -----
From: "Andrew Kirkby" <kirkbyte@...>
To: <yamahacs80@yahoogroups.com>
Sent: Friday, May 20, 2011 1:45 AM
Subject: Re: [yamahacs80] CS-80 keybed aftertouch resistors


> Hi Max,
>
> Are you talking about the FSR (force sensing resistor)?
>
> Those are the key and aftertouch sensor...
>
> Andrew
> On 20/05/2011, at 8:40 AM, Max Fazio wrote:
>
>> Hi all
>> With your kind help , I need to know something about the variable
>> resistors put in the keybed and bound to the aftertouch: according
>> to the big diagram there are 3 of them for each key: in case I'm
>> happening to service an 80 what should be the replacement for them?
>> Ohmic value/tolerance?
>> Thanks for your help!
>> M
>>
>> [Non-text portions of this message have been removed]
>>
>>
>>
>
> Andrew Kirkby
> (e) kirkbyte@...
> (m) 0416 000 070
>
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>

Max,

Unless they are not functioning properly i wouldn't try and replace
them. In any case, i have not come across a suitable part in two years
of casual searching. Sensitronics in the USA might be able to make
them - but they would be expensive and a substantial custom order
would be required.


Andrew

On 20/05/2011, at 10:03 AM, Max Fazio wrote:

> Hi Andy
> Yes, the FSR , I was referring to the aftertouch sensors
> anyway...just I
> find it odd that yamaha is reporting three resistor symbols for each
> key on
> the diagram, where the aftertouch contacts are drawn...what could
> that mean?
> M
> ----- Original Message -----
> From: "Andrew Kirkby" <kirkbyte@...>
> To: <yamahacs80@yahoogroups.com>
> Sent: Friday, May 20, 2011 1:45 AM
> Subject: Re: [yamahacs80] CS-80 keybed aftertouch resistors
>
> > Hi Max,
> >
> > Are you talking about the FSR (force sensing resistor)?
> >
> > Those are the key and aftertouch sensor...
> >
> > Andrew
> > On 20/05/2011, at 8:40 AM, Max Fazio wrote:
> >
> >> Hi all
> >> With your kind help , I need to know something about the variable
> >> resistors put in the keybed and bound to the aftertouch: according
> >> to the big diagram there are 3 of them for each key: in case I'm
> >> happening to service an 80 what should be the replacement for them?
> >> Ohmic value/tolerance?
> >> Thanks for your help!
> >> M
> >>
> >> [Non-text portions of this message have been removed]
> >>
> >>
> >>
> >
> > Andrew Kirkby
> > (e) kirkbyte@...
> > (m) 0416 000 070
> >
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
>
>
>

Andrew Kirkby
(e) kirkbyte@...
(m) 0416 000 070






[Non-text portions of this message have been removed]

Thx Andrew
I understand that, as Sensitronics is one of the few manifacturers who
builds them I could be forced to get a stock of them! just for the record :
are the aftertouch sensors printed on the board? I think yes...any chance to
get the stand-off resistance value for the specific aftertouch resistor in
the CS80? By looking at David's experiment on the aftertouch I can see that
the value can go from 0.00oz---> -0.2V to 90oz-->6.95V, but I think it
doesn't help me findin that value...
M

----- Original Message -----
From: "Andrew Kirkby" <kirkbyte@...>
To: <yamahacs80@yahoogroups.com>
Sent: Friday, May 20, 2011 2:18 AM
Subject: Re: [yamahacs80] CS-80 keybed aftertouch resistors


> Max,
>
> Unless they are not functioning properly i wouldn't try and replace
> them. In any case, i have not come across a suitable part in two years
> of casual searching. Sensitronics in the USA might be able to make
> them - but they would be expensive and a substantial custom order
> would be required.
>
>
> Andrew
>
>
> On 20/05/2011, at 10:03 AM, Max Fazio wrote:
>
>> Hi Andy
>> Yes, the FSR , I was referring to the aftertouch sensors
>> anyway...just I
>> find it odd that yamaha is reporting three resistor symbols for each
>> key on
>> the diagram, where the aftertouch contacts are drawn...what could
>> that mean?
>> M
>> ----- Original Message -----
>> From: "Andrew Kirkby" <kirkbyte@...>
>> To: <yamahacs80@yahoogroups.com>
>> Sent: Friday, May 20, 2011 1:45 AM
>> Subject: Re: [yamahacs80] CS-80 keybed aftertouch resistors
>>
>> > Hi Max,
>> >
>> > Are you talking about the FSR (force sensing resistor)?
>> >
>> > Those are the key and aftertouch sensor...
>> >
>> > Andrew
>> > On 20/05/2011, at 8:40 AM, Max Fazio wrote:
>> >
>> >> Hi all
>> >> With your kind help , I need to know something about the variable
>> >> resistors put in the keybed and bound to the aftertouch: according
>> >> to the big diagram there are 3 of them for each key: in case I'm
>> >> happening to service an 80 what should be the replacement for them?
>> >> Ohmic value/tolerance?
>> >> Thanks for your help!
>> >> M
>> >>
>> >> [Non-text portions of this message have been removed]
>> >>
>> >>
>> >>
>> >
>> > Andrew Kirkby
>> > (e) kirkbyte@...
>> > (m) 0416 000 070
>> >
>> >
>> >
>> >
>> >
>> >
>> > [Non-text portions of this message have been removed]
>> >
>> >
>> >
>> > ------------------------------------
>> >
>> > Yahoo! Groups Links
>> >
>> >
>> >
>>
>>
>>
>
> Andrew Kirkby
> (e) kirkbyte@...
> (m) 0416 000 070
>
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>