Korg Poly800/EX800 Users

hi -
I have a crashed poly 800mk1. It doesn't react, weird display, nothing but a bubbling low 
sound. Seems like it lost the firmware and I need to replace the EPROM, right ? 
Have the eprom bin hex data file, could get a new eprom, but don't know how to do it and do 
not want to buy an eprom burner just for this one time. I am in Vienna, often in Paris too, any 
suggestion where I can have this done easy, fast and at moderate costs ? Anywhere within 
Europe would be cool.
thanks -- Bernard Guillaume

When you say it doesn't react, does that mean you are unable to edit
parameters?  It's likely that you've simply lost all patch data.

It seems less likely that you could have damaged your OS in eprom.

On Tue, 24 Jul 2007, b_e_r_n_a_r_d_g_u_i_l_l_a_u_m_e wrote:

> hi -
> I have a crashed poly 800mk1. It doesn't react, weird display, nothing but a bubbling low
> sound. Seems like it lost the firmware and I need to replace the EPROM, right ?
> Have the eprom bin hex data file, could get a new eprom, but don't know how to do it and do
> not want to buy an eprom burner just for this one time. I am in Vienna, often in Paris too, any
> suggestion where I can have this done easy, fast and at moderate costs ? Anywhere within
> Europe would be cool.
> thanks -- Bernard Guillaume
>
>
>
>
> Yahoo! Groups Links
>
>
>
>

What do you mean by "weird display"?

Mike.

--- In korgpolyex@yahoogroups.com, "b_e_r_n_a_r_d_g_u_i_l_l_a_u_m_e"
<jbgd@...> wrote:
>
> hi -
> I have a crashed poly 800mk1. It doesn't react, weird display,
nothing but a bubbling low 
> sound. Seems like it lost the firmware and I need to replace the
EPROM, right ? 
> Have the eprom bin hex data file, could get a new eprom, but don't
know how to do it and do 
> not want to buy an eprom burner just for this one time. I am in
Vienna, often in Paris too, any 
> suggestion where I can have this done easy, fast and at moderate
costs ? Anywhere within 

> Europe would be cool.
> thanks -- Bernard Guillaume
>

This sounds like the power supply regulation is out of adjustment. A 
really good tech who has fixed several poly's said every one of them 
needed the voltage adjusted to the proper spec in the power section. 
Old capacitors and components will cause this circuit to drift. Then 
the CPU can't initialize the unit. The symptoms were very similar to 
yours. 

--- In korgpolyex@yahoogroups.com, Tim Bieniosek <tab27@...> wrote:
>
> When you say it doesn't react, does that mean you are unable to edit
> parameters?  It's likely that you've simply lost all patch data.
> 
> It seems less likely that you could have damaged your OS in eprom.
> 
> On Tue, 24 Jul 2007, b_e_r_n_a_r_d_g_u_i_l_l_a_u_m_e wrote:
> 
> > hi -
> > I have a crashed poly 800mk1. It doesn't react, weird display, 
nothing but a bubbling low
> > sound. Seems like it lost the firmware and I need to replace the 
EPROM, right ?
> > Have the eprom bin hex data file, could get a new eprom, but 
don't know how to do it and do
> > not want to buy an eprom burner just for this one time. I am in 
Vienna, often in Paris too, any
> > suggestion where I can have this done easy, fast and at moderate 
costs ? Anywhere within

> > Europe would be cool.
> > thanks -- Bernard Guillaume
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
>

Have you tried doing a preset sysx dump? I find these Poly's all the 
time for $20 because the owner 'thinks' the unit is bad. After doing 
a sysx dump with the factory presets, voila! a fully funtional poly. 
I'd start there...

Erik

--- In korgpolyex@yahoogroups.com, "b_e_r_n_a_r_d_g_u_i_l_l_a_u_m_e" 
<jbgd@...> wrote:
>
> hi -
> I have a crashed poly 800mk1. It doesn't react, weird display, 
nothing but a bubbling low 
> sound. Seems like it lost the firmware and I need to replace the 
EPROM, right ? 
> Have the eprom bin hex data file, could get a new eprom, but don't 
know how to do it and do 
> not want to buy an eprom burner just for this one time. I am in 
Vienna, often in Paris too, any 
> suggestion where I can have this done easy, fast and at moderate 
costs ? Anywhere within 

> Europe would be cool.
> thanks -- Bernard Guillaume
>

> Have you tried doing a preset sysx dump?

Poly 800 mk1 doesnt support sysx dump ( until mk3-) ). May be would it 
be similar with tape data loading ? 
But I suppose it is not only sound-program lost. It looks like more 
serious thing - may be mentioned power adjustment...

Hi ! Thanks for numerous answers.

1st of all, there is no backup battery in the unit, it is one of the 1st revision models with 
just the blank space on the board. I was just preparing to do the backup battery mod, but 
couldn't even make it to the store to buy the battery holder... it just suddenly 'crashed'.

For what's the display, it shows a P in the PARAMETER NO. window. 
In the PROGRAMM NO. window something like this ( two lines dot two lines) :

-    -
      -
|  .  



The power supply adjustment issue that narfman96 mentioned before sounds credible. I 
should probably try to find some tech. Or does any of you have a clue what elements I 
could replace myself in the power supply unit ? Soldering is an easy thing... :)

Thanks !
b_e_r_n_a_r_d_g_u_i_l_l_a_u_m_e

Bernard,

If you have a voltmeter check for a good solid 5 volts in the power 
section. The print is here in the file section. VR1 can be adjusted 
to trim the voltage. You shouldn't need to change any components 
unless you can't get the 5 volts dc. You can also check the -5 volts.

Fran aka Narfman 

--- In korgpolyex@yahoogroups.com, "b_e_r_n_a_r_d_g_u_i_l_l_a_u_m_e" 
<jbgd@...> wrote:
>
> Hi ! Thanks for numerous answers.
> 
> 1st of all, there is no backup battery in the unit, it is one of 
the 1st revision models with 
> just the blank space on the board. I was just preparing to do the 
backup battery mod, but 
> couldn't even make it to the store to buy the battery holder... it 
just suddenly 'crashed'.
> 
> For what's the display, it shows a P in the PARAMETER NO. window. 
> In the PROGRAMM NO. window something like this ( two lines dot two 
lines) :
> 
> -    -
>       -
> |  .  
> 
> 
> 
> The power supply adjustment issue that narfman96 mentioned before 
sounds credible. I 
> should probably try to find some tech. Or does any of you have a 
clue what elements I 
> could replace myself in the power supply unit ? Soldering is an 
easy thing... :)

> 
> Thanks !
> b_e_r_n_a_r_d_g_u_i_l_l_a_u_m_e
>