Yamaha P80 electric piano

N

N_Cook

Guest
Loss of sustain, owner borrowed another pedal and a problem in the
keyboard. Tomorrow I will clear the decks ,rig up strops and crane to
open up. But if anyone has been there before and can point to what to
look for and so minimum amount of time with the beast in bits then all
to the good, to get all 7 octaves out of the way as soon as possible
 
I didn't expect the schematic to be out there, but it is.
A simple control line between chassis socket and 1K to the main 168pin
chip. So if no problem in that line then an unlikely and insurmountable
firmware problem presumably
 
"N_Cook" wrote in message news:lim7kc$4hk$1@dont-email.me...

Loss of sustain, owner borrowed another pedal and a problem in the
keyboard. Tomorrow I will clear the decks ,rig up strops and crane to
open up. But if anyone has been there before and can point to what to
look for and so minimum amount of time with the beast in bits then all
to the good, to get all 7 octaves out of the way as soon as possible



People tread on the sustain pedal cable and beak or dry joint the jack
socket.

It's highly unlikely to be anything other than that.




Gareth.
 
"Gareth Magennis" wrote in message news:KNz3v.8287$iZ5.2212@fx17.am4...



"N_Cook" wrote in message news:lim7kc$4hk$1@dont-email.me...

Loss of sustain, owner borrowed another pedal and a problem in the
keyboard. Tomorrow I will clear the decks ,rig up strops and crane to
open up. But if anyone has been there before and can point to what to
look for and so minimum amount of time with the beast in bits then all
to the good, to get all 7 octaves out of the way as soon as possible



People tread on the sustain pedal cable and beak or dry joint the jack
socket.

It's highly unlikely to be anything other than that.





Except I had one of these keyboards in for repair about 6 months ago where
the sustain didn't work, but that was because the whole PCB had been pushed
into the keyboard.
Someone must have given the sustain pedal jack plug a severe whack, or
perhaps upended the keyboard onto the floor without first removing it.


Gareth.
 
On 16/04/2014 19:21, Gareth Magennis wrote:
"Gareth Magennis" wrote in message news:KNz3v.8287$iZ5.2212@fx17.am4...



"N_Cook" wrote in message news:lim7kc$4hk$1@dont-email.me...

Loss of sustain, owner borrowed another pedal and a problem in the
keyboard. Tomorrow I will clear the decks ,rig up strops and crane to
open up. But if anyone has been there before and can point to what to
look for and so minimum amount of time with the beast in bits then all
to the good, to get all 7 octaves out of the way as soon as possible



People tread on the sustain pedal cable and beak or dry joint the jack
socket.

It's highly unlikely to be anything other than that.





Except I had one of these keyboards in for repair about 6 months ago
where the sustain didn't work, but that was because the whole PCB had
been pushed into the keyboard.
Someone must have given the sustain pedal jack plug a severe whack, or
perhaps upended the keyboard onto the floor without first removing it.


Gareth.
Click to expand...

I suppose one-man-bands who regularly repair P80/P100s and the like have
a heavy duty frame for fixing the piano to, to safely take apart without
damage to keyboard or human back. I've only dealt with P100 before and
going by the P80 SM the process seems its possible to do single-handed
without too much of a problem. I'll find out tomorrow.
 
On Wed, 16 Apr 2014 16:29:15 +0100, N_Cook <diverse@tcp.co.uk> wrote:

Loss of sustain, owner borrowed another pedal and a problem in the
keyboard. Tomorrow I will clear the decks ,rig up strops and crane to
open up. But if anyone has been there before and can point to what to
look for and so minimum amount of time with the beast in bits then all
to the good, to get all 7 octaves out of the way as soon as possible
Click to expand...

Its usually broken PCB tracks under the sustain socket. I remove the
socket, get rid of the broken PCB track ends, then refit the socket with a
bed of hot melt glue, & finally repair the tracks with narrow de-soldering
wick.
Never had one back after this.
--
Tetigisti acu (Titus Maccius Plautus 254 - 184 BC)
 
"N_Cook" wrote in message news:liml46$dn0$1@dont-email.me...

On 16/04/2014 19:21, Gareth Magennis wrote:
"Gareth Magennis" wrote in message news:KNz3v.8287$iZ5.2212@fx17.am4...



"N_Cook" wrote in message news:lim7kc$4hk$1@dont-email.me...

Loss of sustain, owner borrowed another pedal and a problem in the
keyboard. Tomorrow I will clear the decks ,rig up strops and crane to
open up. But if anyone has been there before and can point to what to
look for and so minimum amount of time with the beast in bits then all
to the good, to get all 7 octaves out of the way as soon as possible



People tread on the sustain pedal cable and beak or dry joint the jack
socket.

It's highly unlikely to be anything other than that.





Except I had one of these keyboards in for repair about 6 months ago
where the sustain didn't work, but that was because the whole PCB had
been pushed into the keyboard.
Someone must have given the sustain pedal jack plug a severe whack, or
perhaps upended the keyboard onto the floor without first removing it.


Gareth.
Click to expand...

I suppose one-man-bands who regularly repair P80/P100s and the like have
a heavy duty frame for fixing the piano to, to safely take apart without
damage to keyboard or human back. I've only dealt with P100 before and
going by the P80 SM the process seems its possible to do single-handed
without too much of a problem. I'll find out tomorrow.





It is reasonably easy to prop such a heavy keyboard vertically against the
bench, so all that is then necessary is to lift the end sitting on the floor
up to the level of the bench, and site it upon it, with most of the weight
pivoting on the bench.

You have then been able to lift said heavy keyboard onto the bench without
actually having to lift its entire weight.



Goliath.
 
On 16/04/2014 22:12, Gareth Magennis wrote:
"N_Cook" wrote in message news:liml46$dn0$1@dont-email.me...

On 16/04/2014 19:21, Gareth Magennis wrote:


"Gareth Magennis" wrote in message news:KNz3v.8287$iZ5.2212@fx17.am4...



"N_Cook" wrote in message news:lim7kc$4hk$1@dont-email.me...

Loss of sustain, owner borrowed another pedal and a problem in the
keyboard. Tomorrow I will clear the decks ,rig up strops and crane to
open up. But if anyone has been there before and can point to what to
look for and so minimum amount of time with the beast in bits then all
to the good, to get all 7 octaves out of the way as soon as possible



People tread on the sustain pedal cable and beak or dry joint the jack
socket.

It's highly unlikely to be anything other than that.





Except I had one of these keyboards in for repair about 6 months ago
where the sustain didn't work, but that was because the whole PCB had
been pushed into the keyboard.
Someone must have given the sustain pedal jack plug a severe whack, or
perhaps upended the keyboard onto the floor without first removing it.


Gareth.

I suppose one-man-bands who regularly repair P80/P100s and the like have
a heavy duty frame for fixing the piano to, to safely take apart without
damage to keyboard or human back. I've only dealt with P100 before and
going by the P80 SM the process seems its possible to do single-handed
without too much of a problem. I'll find out tomorrow.





It is reasonably easy to prop such a heavy keyboard vertically against
the bench, so all that is then necessary is to lift the end sitting on
the floor up to the level of the bench, and site it upon it, with most
of the weight pivoting on the bench.

You have then been able to lift said heavy keyboard onto the bench
without actually having to lift its entire weight.



Goliath.
Click to expand...

Relatively painless getting inside, no hoist needed. Ominously 2 bare
steel paper clips loose inside. I wonder if stationery suppliers moved
over to coated ones after representations from office equipment suppliers.
Bad solder on sustain jack socket and also power switch solder going
home, so redo all relevant solder points on those boards. No sticky keys
so no reason to swap keys between octaves but anything else to check
while inside?
 
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:lio74o$ig9$1@dont-email.me...
On 16/04/2014 22:12, Gareth Magennis wrote:


"N_Cook" wrote in message news:liml46$dn0$1@dont-email.me...

On 16/04/2014 19:21, Gareth Magennis wrote:


"Gareth Magennis" wrote in message news:KNz3v.8287$iZ5.2212@fx17.am4...



"N_Cook" wrote in message news:lim7kc$4hk$1@dont-email.me...

Loss of sustain, owner borrowed another pedal and a problem in the
keyboard. Tomorrow I will clear the decks ,rig up strops and crane to
open up. But if anyone has been there before and can point to what to
look for and so minimum amount of time with the beast in bits then all
to the good, to get all 7 octaves out of the way as soon as possible



People tread on the sustain pedal cable and beak or dry joint the jack
socket.

It's highly unlikely to be anything other than that.





Except I had one of these keyboards in for repair about 6 months ago
where the sustain didn't work, but that was because the whole PCB had
been pushed into the keyboard.
Someone must have given the sustain pedal jack plug a severe whack, or
perhaps upended the keyboard onto the floor without first removing it.


Gareth.

I suppose one-man-bands who regularly repair P80/P100s and the like have
a heavy duty frame for fixing the piano to, to safely take apart without
damage to keyboard or human back. I've only dealt with P100 before and
going by the P80 SM the process seems its possible to do single-handed
without too much of a problem. I'll find out tomorrow.





It is reasonably easy to prop such a heavy keyboard vertically against
the bench, so all that is then necessary is to lift the end sitting on
the floor up to the level of the bench, and site it upon it, with most
of the weight pivoting on the bench.

You have then been able to lift said heavy keyboard onto the bench
without actually having to lift its entire weight.



Goliath.

Relatively painless getting inside, no hoist needed. Ominously 2 bare
steel paper clips loose inside. I wonder if stationery suppliers moved
over to coated ones after representations from office equipment suppliers.
Bad solder on sustain jack socket and also power switch solder going home,
so redo all relevant solder points on those boards. No sticky keys so no
reason to swap keys between octaves but anything else to check while
inside?
Click to expand...


I usually resolder all the outside world connectors as preventative
maintenance..



Gareth.
 
Got the sustain to work with a simple switch externally but not with the
supplied footpedal. Looks similar but no name and slightly different
pedal shape. This one uses 2 conductive foam switch pads at top and
bottom of stroke. So varying in a somewhat undefined way from about 30
ohm to about 160 ohm. 30 ohm as rest (internal sprung)state of one and
160 ohm as fully compressed (down), as set, on the other. Resistance
changing between the 2 positions. It looks as though the P80 is on or
off sustain not variable, correct?. Removed the "160" ohm membrane and
it now works , going from 30 R to infinity, leaving the membrane stowed
inside for anyone later to play with
 
The mechanicals of Y FC4 sustain pedal is in the P80 SM. Says switch
assembly, not variable resistor, so I'll stay with the fudged no-name
pedal and fit keyboard back in the casing
 
Another strange item to add to my jigs box. I've worked out how to
reassemble single-handed and safely, support the weight of the keyboard
while aligning and fixing (the awkward part) the casing around it. The
screws for the rubber feet are longer than actually required. With
keyboard propped against the wall, vertically, slacken the "top" 2 off
and fix a wire coathanger around the 2 screws, tighten, deform the
coathanger around the screws and reinforce the hook of the hanger with
wire or tape, then hang that from a loop attached to a ceiling screw-eye
or some other fixing point.
 
I ended up unwrapping the wire of the hook a bit and then cross-linking
by wrapping around , to make a stronger hook. But it made it a doddle
,that over and under business at a relative angle while supporting the
keyboard weight, minding not to break the wires , and then aligning for
closure
 
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