Korg Poly800/EX800 Users

WOW!!!

Sorry about my bad english, i'm posting this just in case somebody is 
having the same problem...

After a long time my poly suddenly died, today I've started packing 
it to find a repair shop... I've opened and decide to make a last 
try, tweak the tripots a little, and stuff, in the worst case i would 
put the screws back in place and bring it to a repair shop... I've 
just disconnected the cable from the delay board, then reconected 
again... Then the diodes on the other board went warm and glowing 
then i thought i lost it for good... But it turned on working like 
nothing happened, the display shown the 11 patch, but the patches 
were gone... I've just reloaded the patches using the "tape in" and 
now it works perfectly...

I collect dead poly 800s////

skunkride <skunkride@...> wrote:Nice one Julio !  Gives me hope about my dead Poly....

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have you got any tone generator chips you could send me?

my poly works on the digital side, all the patches store etc, midi out 
works, just nothing comes out of the tone generator!

ive put a cro over the data lines, and signals and clock all appear to 
be working, just that chip has no output on the tone lines.

any help available?

best regards,

Marcus in Oz
On Saturday, July 17, 2004, at 06:45 AM, x x wrote:

> I collect dead poly 800s////
>
> skunkride <skunkride@...> wrote:
>
>
> Nice one Julio !  Gives me hope about my dead Poly....
>
>
>
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> Yahoo! Mail - Helps protect you from nasty viruses.
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is that a poly 800?

Marcus Wilson <JB@...> wrote:have you got any tone generator chips you could send me?

my poly works on the digital side, all the patches store etc, midi out 
works, just nothing comes out of the tone generator!

ive put a cro over the data lines, and signals and clock all appear to 
be working, just that chip has no output on the tone lines.

any help available?

best regards,

Marcus in Oz
On Saturday, July 17, 2004, at 06:45 AM, x x wrote:

> I collect dead poly 800s////
>
> skunkride wrote:
>
>
> Nice one Julio !  Gives me hope about my dead Poly....
>
>
>

>
> Do you Yahoo!?
> Yahoo! Mail - Helps protect you from nasty viruses.

>
> Yahoo! Groups Links
>
> \ufffd To visit your group on the web, go to:
> http://groups.yahoo.com/group/korgpolyex/
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mines a poly800 yeah

all works for midi control
no tone generation tho

looking for a working tone generator for it

Marcus
On Saturday, July 17, 2004, at 09:54 AM, x x wrote:

> is that a poly 800?
>
> Marcus Wilson <JB@designlab.cx> wrote:
>
> have you got any tone generator chips you could send me?
>
> my poly works on the digital side, all the patches store etc, midi out
> works, just nothing comes out of the tone generator!
>
> ive put a cro over the data lines, and signals and clock all appear to
> be working, just that chip has no output on the tone lines.
>
> any help available?
>
> best regards,
>
> Marcus in Oz
> On Saturday, July 17, 2004, at 06:45 AM, x x wrote:
>
> > I collect dead poly 800s////
> >
> > skunkride wrote:
> >
> >
> > Nice one Julio !  Gives me hope about my dead Poly....
> >
> >
> >
>
> >
> > Do you Yahoo!?
> > Yahoo! Mail - Helps protect you from nasty viruses.
>
> >
> > Yahoo! Groups Links
> >
> > ï To visit your group on the web, go to:
> > http://groups.yahoo.com/group/korgpolyex/
> >  
> > ï To unsubscribe from this group, send an email to:
> > korgpolyex-unsubscribe@yahoogroups.com
> >  
> > ï Your use of Yahoo! Groups is subject to the Yahoo! Terms of 
> Service.
> >
>
>
>
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>
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> Vote for the stars of Yahoo!'s next ad campaign!
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>
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>
> Yahoo! Groups Links
>
> • 	To visit your group on the web, go to:
> http://groups.yahoo.com/group/korgpolyex/
>  
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> korgpolyex-unsubscribe@yahoogroups.com
>  
> • 	Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
>

It is one toshiba chip that needs to be replaced.
It is mentioned in the service manual should all work but no sound be heard from the poly 800. Its on the main board. The number of the chip is on my schematics . I cant gurentee it but it is in the service notes. apperntly enough of the same prob happend that this was a major note. Im not saying this is or isnt .But Ive bought a few poly 800s and its one or the other chips for the output control to the sound source of the poly 800....
If interested Ill get the part number and email the service note. If you can solder very finely its not a big chip. I dont know if I have a spare im pretty much building up parts to keep for me when this happens again. SinceI have three and I bought some extras let me see what I find out when I look through my parts bin I collect toshiba chips and major processors for the poly .Im now starting to with the juno. I will sale poly 800 keys now and some other stuff .This will also change I bid on every broken one I can find...
Peace
Alien


Marcus Wilson <JB@...> wrote:
mines a poly800 yeah

all works for midi control
no tone generation tho

looking for a working tone generator for it

Marcus
On Saturday, July 17, 2004, at 09:54 AM, x x wrote:

> is that a poly 800?
>
> Marcus Wilson wrote:
>
> have you got any tone generator chips you could send me?
>
> my poly works on the digital side, all the patches store etc, midi out
> works, just nothing comes out of the tone generator!
>
> ive put a cro over the data lines, and signals and clock all appear to
> be working, just that chip has no output on the tone lines.
>
> any help available?
>
> best regards,
>
> Marcus in Oz
> On Saturday, July 17, 2004, at 06:45 AM, x x wrote:
>
> > I collect dead poly 800s////
> >
> > skunkride wrote:
> >
> >
> > Nice one Julio !  Gives me hope about my dead Poly....
> >
> >
> >
>
> >
> > Do you Yahoo!?
> > Yahoo! Mail - Helps protect you from nasty viruses.
>
> >
> > Yahoo! Groups Links
> >
> > \ufffd To visit your group on the web, go to:
> > http://groups.yahoo.com/group/korgpolyex/
> >  
> > \ufffd To unsubscribe from this group, send an email to:
> > korgpolyex-unsubscribe@yahoogroups.com
> >  
> > \ufffd Your use of Yahoo! Groups is subject to the Yahoo! Terms of 
> Service.
> >
>
>
>

>
> Do you Yahoo!?
> Vote for the stars of Yahoo!'s next ad campaign!

>
>

>
> Yahoo! Groups Links
>
> \ufffd To visit your group on the web, go to:
> http://groups.yahoo.com/group/korgpolyex/
>  
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>

		
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awesome!~
i'd be very keen to find out more.

Mine was dead until i replaced a couple of power transistors in the +/- 
5V stage that were buggered, and had been poorly messed with  by a 
previous owner.
I bought mine for $10 in a carpark junk sale, and took it home,
managed to get the midi control side going so now i can control my 
other gear with the poly,

all of the patches etc can be edited stored etc, and i managed to 
reload factory settings too, but no sound out.

It looked like the clock and everything was performing properly but no 
tone out of the tone generator.

Soldering is easy for me, so if you can point me to the correct 
component, i should be able to make it happy again, and that would be 
awesome!

thanks again for your info so far.

Marcus
On Sunday, July 18, 2004, at 06:03 PM, x x wrote:

> It is one toshiba chip that needs to be replaced.
> It is mentioned in the service manual should all work but no sound be 
> heard from the poly 800. Its on the main board. The number of the chip 
> is on my schematics . I cant gurentee it but it is in the service 
> notes. apperntly enough of the same prob happend that this was a major 
> note. Im not saying this is or isnt .But Ive bought a few poly 800s 
> and its one or the other chips for the output control to the sound 
> source of the poly 800....
> If interested Ill get the part number and email the service note. If 
> you can solder very finely its not a big chip. I dont know if I have a 
> spare im pretty much building up parts to keep for me when this 
> happens again. SinceI have three and I bought some extras let me see 
> what I find out when I look through my parts bin I collect toshiba 
> chips and major processors for the poly .Im now starting to with the 
> juno. I will sale poly 800 keys now and some other stuff .This will 
> also change I bid on every broken one I can find...
> Peace
> Alien
>
>
> Marcus Wilson <JB@...> wrote:
>
> mines a poly800 yeah
>
> all works for midi control
> no tone generation tho
>
> looking for a working tone generator for it
>
> Marcus
> On Saturday, July 17, 2004, at 09:54 AM, x x wrote:
>
> > is that a poly 800?
> >
> > Marcus Wilson wrote:
> >
> > have you got any tone generator chips you could send me?
> >
> > my poly works on the digital side, all the patches store etc, midi 
> out
> > works, just nothing comes out of the tone generator!
> >
> > ive put a cro over the data lines, and signals and clock all appear 
> to
> > be working, just that chip has no output on the tone lines.
> >
> > any help available?
> >
> > best regards,
> >
> > Marcus in Oz
> > On Saturday, July 17, 2004, at 06:45 AM, x x wrote:
> >
> > > I collect dead poly 800s////
> > >
> > > skunkride wrote:
> > >
> > >
> > > Nice one Julio !  Gives me hope about my dead Poly....
> > >
> > >
> > >
> >
> > >
> > > Do you Yahoo!?
> > > Yahoo! Mail - Helps protect you from nasty viruses.
> >
> > >
> > > Yahoo! Groups Links
> > >
> > > Ô To visit your group on the web, go to:
> > > http://groups.yahoo.com/group/korgpolyex/
> > >  
> > > Ô To unsubscribe from this group, send an email to:
> > > korgpolyex-unsubscribe@yahoogroups.com
> > >  
> > > Ô Your use of Yahoo! Groups is subject to the Yahoo! Terms of
> > Service.
> > >
> >
> >
> >
>
> >
> > Do you Yahoo!?
> > Vote for the stars of Yahoo!'s next ad campaign!
>
> >
> >
>
> >
> > Yahoo! Groups Links
> >
> > ï To visit your group on the web, go to:
> > http://groups.yahoo.com/group/korgpolyex/
> >  
> > ï To unsubscribe from this group, send an email to:
> > korgpolyex-unsubscribe@yahoogroups.com
> >  
> > ï Your use of Yahoo! Groups is subject to the Yahoo! Terms of 
> Service.
> >
>
>
>
<image.tiff>
>
> Do you Yahoo!?
> Vote for the stars of Yahoo!'s next ad campaign!
<image.tiff>
>
>
<image.tiff>

>
> Yahoo! Groups Links
>
> • 	To visit your group on the web, go to:
> http://groups.yahoo.com/group/korgpolyex/
>  
> • 	To unsubscribe from this group, send an email to:
> korgpolyex-unsubscribe@yahoogroups.com
>  
> • 	Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
>

Ok im looking up chip today you will have to find the chip on the net I dont think ill have one to spare. It wasnt easy locating the last set ...
It sounds so like the main problem described in the tech notes up date that I fixed a poly with ....
Will let you know today.
Patrick

Marcus Wilson <JB@...> wrote:
awesome!~
i'd be very keen to find out more.

Mine was dead until i replaced a couple of power transistors in the +/- 
5V stage that were buggered, and had been poorly messed with by a 
previous owner.
I bought mine for $10 in a carpark junk sale, and took it home,
managed to get the midi control side going so now i can control my 
other gear with the poly,

all of the patches etc can be edited stored etc, and i managed to 
reload factory settings too, but no sound out.

It looked like the clock and everything was performing properly but no 
tone out of the tone generator.

Soldering is easy for me, so if you can point me to the correct 
component, i should be able to make it happy again, and that would be 
awesome!

thanks again for your info so far.

Marcus
On Sunday, July 18, 2004, at 06:03 PM, x x wrote:

> It is one toshiba chip that needs to be replaced.
> It is mentioned in the service manual should all work but no sound be 
> heard from the poly 800. Its on the main board. The number of the chip 
> is on my schematics . I cant gurentee it but it is in the service 
> notes. apperntly enough of the same prob happend that this was a major 
> note. Im not saying this is or isnt .But Ive bought a few poly 800s 
> and its one or the other chips for the output control to the sound 
> source of the poly 800....
> If interested Ill get the part number and email the service note. If 
> you can solder very finely its not a big chip. I dont know if I have a 
> spare im pretty much building up parts to keep for me when this 
> happens again. SinceI have three and I bought some extras let me see 
> what I find out when I look through my parts bin I collect toshiba 
> chips and major processors for the poly .Im now starting to with the 
> juno. I will sale poly 800 keys now and some other stuff .This will 
> also change I bid on every broken one I can find...
> Peace
> Alien
>
>
> Marcus Wilson wrote:
>
> mines a poly800 yeah
>
> all works for midi control
> no tone generation tho
>
> looking for a working tone generator for it
>
> Marcus
> On Saturday, July 17, 2004, at 09:54 AM, x x wrote:
>
> > is that a poly 800?
> >
> > Marcus Wilson wrote:
> >
> > have you got any tone generator chips you could send me?
> >
> > my poly works on the digital side, all the patches store etc, midi 
> out
> > works, just nothing comes out of the tone generator!
> >
> > ive put a cro over the data lines, and signals and clock all appear 
> to
> > be working, just that chip has no output on the tone lines.
> >
> > any help available?
> >
> > best regards,
> >
> > Marcus in Oz
> > On Saturday, July 17, 2004, at 06:45 AM, x x wrote:
> >
> > > I collect dead poly 800s////
> > >
> > > skunkride wrote:
> > >
> > >
> > > Nice one Julio !  Gives me hope about my dead Poly....
> > >
> > >
> > >
> >
> > >
> > > Do you Yahoo!?
> > > Yahoo! Mail - Helps protect you from nasty viruses.
> >
> > >
> > > Yahoo! Groups Links
> > >
> > > \ufffd To visit your group on the web, go to:
> > > http://groups.yahoo.com/group/korgpolyex/
> > >  
> > > \ufffd To unsubscribe from this group, send an email to:
> > > korgpolyex-unsubscribe@yahoogroups.com
> > >  
> > > \ufffd Your use of Yahoo! Groups is subject to the Yahoo! Terms of
> > Service.
> > >
> >
> >
> >
>
> >
> > Do you Yahoo!?
> > Vote for the stars of Yahoo!'s next ad campaign!
>
> >
> >
>
> >
> > Yahoo! Groups Links
> >
> > \ufffd To visit your group on the web, go to:
> > http://groups.yahoo.com/group/korgpolyex/
> >  
> > \ufffd To unsubscribe from this group, send an email to:
> > korgpolyex-unsubscribe@yahoogroups.com
> >  
> > \ufffd Your use of Yahoo! Groups is subject to the Yahoo! Terms of 
> Service.
> >
>
>
>

>
> Do you Yahoo!?
> Vote for the stars of Yahoo!'s next ad campaign!

>
>

>
> Yahoo! Groups Links
>
> \ufffd To visit your group on the web, go to:
> http://groups.yahoo.com/group/korgpolyex/
>  
> \ufffd To unsubscribe from this group, send an email to:
> korgpolyex-unsubscribe@yahoogroups.com
>  
> \ufffd Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
>

		
---------------------------------
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Vote for the stars of Yahoo!'s next ad campaign!

sounds like an excellent start anyway!@

i have put my poly to one side at the moment, as i had no clue as to 
where to proceed, this at least gives me a direction.

once again thank you for the info, hopefully it will bring one more 
poly back to life!

thanks!

Marcus
On Monday, July 19, 2004, at 05:34 AM, x x wrote:

> Ok im looking up chip today you will have to find the chip on the net 
> I dont think ill have one to spare. It wasnt easy locating the last 
> set ...
> It sounds so like the main problem described in the tech notes up date 
> that I fixed a poly with ....
> Will let you know today.
> Patrick
>
> Marcus Wilson <JB@...> wrote:
>
> awesome!~
> i'd be very keen to find out more.
>
> Mine was dead until i replaced a couple of power transistors in the +/-
> 5V stage that were buggered, and had been poorly messed with by a
> previous owner.
> I bought mine for $10 in a carpark junk sale, and took it home,
> managed to get the midi control side going so now i can control my
> other gear with the poly,
>
> all of the patches etc can be edited stored etc, and i managed to
> reload factory settings too, but no sound out.
>
> It looked like the clock and everything was performing properly but no
> tone out of the tone generator.
>
> Soldering is easy for me, so if you can point me to the correct
> component, i should be able to make it happy again, and that would be
> awesome!
>
> thanks again for your info so far.
>
> Marcus
> On Sunday, July 18, 2004, at 06:03 PM, x x wrote:
>
> > It is one toshiba chip that needs to be replaced.
> > It is mentioned in the service manual should all work but no sound be
> > heard from the poly 800. Its on the main board. The number of the 
> chip
> > is on my schematics . I cant gurentee it but it is in the service
> > notes. apperntly enough of the same prob happend that this was a 
> major
> > note. Im not saying this is or isnt .But Ive bought a few poly 800s
> > and its one or the other chips for the output control to the sound
> > source of the poly 800....
> > If interested Ill get the part number and email the service note. If
> > you can solder very finely its not a big chip. I dont know if I have 
> a
> > spare im pretty much building up parts to keep for me when this
> > happens again. SinceI have three and I bought some extras let me see
> > what I find out when I look through my parts bin I collect toshiba
> > chips and major processors for the poly .Im now starting to with the
> > juno. I will sale poly 800 keys now and some other stuff .This will
> > also change I bid on every broken one I can find...
> > Peace
> > Alien
> >
> >
> > Marcus Wilson wrote:
> >
> > mines a poly800 yeah
> >
> > all works for midi control
> > no tone generation tho
> >
> > looking for a working tone generator for it
> >
> > Marcus
> > On Saturday, July 17, 2004, at 09:54 AM, x x wrote:
> >
> > > is that a poly 800?
> > >
> > > Marcus Wilson wrote:
> > >
> > > have you got any tone generator chips you could send me?
> > >
> > > my poly works on the digital side, all the patches store etc, midi
> > out
> > > works, just nothing comes out of the tone generator!
> > >
> > > ive put a cro over the data lines, and signals and clock all appear
> > to
> > > be working, just that chip has no output on the tone lines.
> > >
> > > any help available?
> > >
> > > best regards,
> > >
> > > Marcus in Oz
> > > On Saturday, July 17, 2004, at 06:45 AM, x x wrote:
> > >
> > > > I collect dead poly 800s////
> > > >
> > > > skunkride wrote:
> > > >
> > > >
> > > > Nice one Julio !  Gives me hope about my dead Poly....
> > > >
> > > >
> > > >
> > >
> > > >
> > > > Do you Yahoo!?
> > > > Yahoo! Mail - Helps protect you from nasty viruses.
> > >
> > > >
> > > > Yahoo! Groups Links
> > > >
> > > > ‘ To visit your group on the web, go to:
> > > > http://groups.yahoo.com/group/korgpolyex/
> > > >  
> > > > ‘ To unsubscribe from this group, send an email to:
> > > > korgpolyex-unsubscribe@yahoogroups.com
> > > >  
> > > > ‘ Your use of Yahoo! Groups is subject to the Yahoo! Terms of
> > > Service.
> > > >
> > >
> > >
> > >
> >
> > >
> > > Do you Yahoo!?
> > > Vote for the stars of Yahoo!'s next ad campaign!
> >
> > >
> > >
> >
> > >
> > > Yahoo! Groups Links
> > >
> > > Ô To visit your group on the web, go to:
> > > http://groups.yahoo.com/group/korgpolyex/
> > >  
> > > Ô To unsubscribe from this group, send an email to:
> > > korgpolyex-unsubscribe@yahoogroups.com
> > >  
> > > Ô Your use of Yahoo! Groups is subject to the Yahoo! Terms of
> > Service.
> > >
> >
> >
> >
>
> >
> > Do you Yahoo!?
> > Vote for the stars of Yahoo!'s next ad campaign!
>
> >
> >
>
> >
> > Yahoo! Groups Links
> >
> > ï To visit your group on the web, go to:
> > http://groups.yahoo.com/group/korgpolyex/
> >  
> > ï To unsubscribe from this group, send an email to:
> > korgpolyex-unsubscribe@yahoogroups.com
> >  
> > ï Your use of Yahoo! Groups is subject to the Yahoo! Terms of 
> Service.
> >
>
>
>
<image.tiff>
>
> Do you Yahoo!?
> Vote for the stars of Yahoo!'s next ad campaign!
<image.tiff>
>
>
<image.tiff>

>
> Yahoo! Groups Links
>
> • 	To visit your group on the web, go to:
> http://groups.yahoo.com/group/korgpolyex/
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> • 	To unsubscribe from this group, send an email to:
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Service note.If Ic 34 (TCH40H138) fails then no sound will be heard for some or all groups of eight notes. So this would make believe as since it is in the service notes that this is a common flaw of this chip.
It is a toshiba chip. Ic 34 decodes all adresses for the cpu bus line supply.If this doesnt work you are doomed. If you need more info ill break out my parts box and stare at it. But I am unable to let such a valuble chip go man it took me weeks to find. I will look at the place I think I bought them at its a vintage chips sort of giant if they dont have it it dosent exist.I got as many as I could. Of Ic 33 and Ic 34 fail allot.If Ic 34 fail the one voice goes out in the cycle. These are outdated chips commonly made for other stuff.Happy hunting and good luck this is on page six of the schematic for poly 800 vers one repair same deal just added the delay section ...I assume no liabilty or malice this is a suggestion and any damage you do is on your own.
Happy trails
Alien

Marcus Wilson <JB@...> wrote:
sounds like an excellent start anyway!@

i have put my poly to one side at the moment, as i had no clue as to 
where to proceed, this at least gives me a direction.

once again thank you for the info, hopefully it will bring one more 
poly back to life!

thanks!

Marcus
On Monday, July 19, 2004, at 05:34 AM, x x wrote:

> Ok im looking up chip today you will have to find the chip on the net 
> I dont think ill have one to spare. It wasnt easy locating the last 
> set ...
> It sounds so like the main problem described in the tech notes up date 
> that I fixed a poly with ....
> Will let you know today.
> Patrick
>
> Marcus Wilson wrote:
>
> awesome!~
> i'd be very keen to find out more.
>
> Mine was dead until i replaced a couple of power transistors in the +/-
> 5V stage that were buggered, and had been poorly messed with by a
> previous owner.
> I bought mine for $10 in a carpark junk sale, and took it home,
> managed to get the midi control side going so now i can control my
> other gear with the poly,
>
> all of the patches etc can be edited stored etc, and i managed to
> reload factory settings too, but no sound out.
>
> It looked like the clock and everything was performing properly but no
> tone out of the tone generator.
>
> Soldering is easy for me, so if you can point me to the correct
> component, i should be able to make it happy again, and that would be
> awesome!
>
> thanks again for your info so far.
>
> Marcus
> On Sunday, July 18, 2004, at 06:03 PM, x x wrote:
>
> > It is one toshiba chip that needs to be replaced.
> > It is mentioned in the service manual should all work but no sound be
> > heard from the poly 800. Its on the main board. The number of the 
> chip
> > is on my schematics . I cant gurentee it but it is in the service
> > notes. apperntly enough of the same prob happend that this was a 
> major
> > note. Im not saying this is or isnt .But Ive bought a few poly 800s
> > and its one or the other chips for the output control to the sound
> > source of the poly 800....
> > If interested Ill get the part number and email the service note. If
> > you can solder very finely its not a big chip. I dont know if I have 
> a
> > spare im pretty much building up parts to keep for me when this
> > happens again. SinceI have three and I bought some extras let me see
> > what I find out when I look through my parts bin I collect toshiba
> > chips and major processors for the poly .Im now starting to with the
> > juno. I will sale poly 800 keys now and some other stuff .This will
> > also change I bid on every broken one I can find...
> > Peace
> > Alien
> >
> >
> > Marcus Wilson wrote:
> >
> > mines a poly800 yeah
> >
> > all works for midi control
> > no tone generation tho
> >
> > looking for a working tone generator for it
> >
> > Marcus
> > On Saturday, July 17, 2004, at 09:54 AM, x x wrote:
> >
> > > is that a poly 800?
> > >
> > > Marcus Wilson wrote:
> > >
> > > have you got any tone generator chips you could send me?
> > >
> > > my poly works on the digital side, all the patches store etc, midi
> > out
> > > works, just nothing comes out of the tone generator!
> > >
> > > ive put a cro over the data lines, and signals and clock all appear
> > to
> > > be working, just that chip has no output on the tone lines.
> > >
> > > any help available?
> > >
> > > best regards,
> > >
> > > Marcus in Oz
> > > On Saturday, July 17, 2004, at 06:45 AM, x x wrote:
> > >
> > > > I collect dead poly 800s////
> > > >
> > > > skunkride wrote:
> > > >
> > > >
> > > > Nice one Julio !  Gives me hope about my dead Poly....
> > > >
> > > >
> > > >
> > >
> > > >
> > > > Do you Yahoo!?
> > > > Yahoo! Mail - Helps protect you from nasty viruses.
> > >
> > > >
> > > > Yahoo! Groups Links
> > > >
> > > > \ufffd To visit your group on the web, go to:
> > > > http://groups.yahoo.com/group/korgpolyex/
> > > >  
> > > > \ufffd To unsubscribe from this group, send an email to:
> > > > korgpolyex-unsubscribe@yahoogroups.com
> > > >  
> > > > \ufffd Your use of Yahoo! Groups is subject to the Yahoo! Terms of
> > > Service.
> > > >
> > >
> > >
> > >
> >
> > >
> > > Do you Yahoo!?
> > > Vote for the stars of Yahoo!'s next ad campaign!
> >
> > >
> > >
> >
> > >
> > > Yahoo! Groups Links
> > >
> > > \ufffd To visit your group on the web, go to:
> > > http://groups.yahoo.com/group/korgpolyex/
> > >  
> > > \ufffd To unsubscribe from this group, send an email to:
> > > korgpolyex-unsubscribe@yahoogroups.com
> > >  
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> > Service.
> > >
> >
> >
> >
>
> >
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> > Vote for the stars of Yahoo!'s next ad campaign!
>
> >
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>
> >
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> >
> > \ufffd To visit your group on the web, go to:
> > http://groups.yahoo.com/group/korgpolyex/
> >  
> > \ufffd To unsubscribe from this group, send an email to:
> > korgpolyex-unsubscribe@yahoogroups.com
> >  
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> Service.
> >
>
>
>

>
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> Vote for the stars of Yahoo!'s next ad campaign!

>
>

>
> Yahoo! Groups Links
>
> \ufffd To visit your group on the web, go to:
> http://groups.yahoo.com/group/korgpolyex/
>  
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let me know if you got my info on the chip # ic 34 page six of the repair manual for vers one and 2 is the same in this realm. TC40H138 fails there will be no xound heard for some or all of the groups. This seems logical to assume that since all other functions seem working that this would be the answer.When you get it to work I have patches to trade.Good luck 
Alien

Marcus Wilson <JB@...> wrote:
sounds like an excellent start anyway!@

i have put my poly to one side at the moment, as i had no clue as to 
where to proceed, this at least gives me a direction.

once again thank you for the info, hopefully it will bring one more 
poly back to life!

thanks!

Marcus
On Monday, July 19, 2004, at 05:34 AM, x x wrote:

> Ok im looking up chip today you will have to find the chip on the net 
> I dont think ill have one to spare. It wasnt easy locating the last 
> set ...
> It sounds so like the main problem described in the tech notes up date 
> that I fixed a poly with ....
> Will let you know today.
> Patrick
>
> Marcus Wilson wrote:
>
> awesome!~
> i'd be very keen to find out more.
>
> Mine was dead until i replaced a couple of power transistors in the +/-
> 5V stage that were buggered, and had been poorly messed with by a
> previous owner.
> I bought mine for $10 in a carpark junk sale, and took it home,
> managed to get the midi control side going so now i can control my
> other gear with the poly,
>
> all of the patches etc can be edited stored etc, and i managed to
> reload factory settings too, but no sound out.
>
> It looked like the clock and everything was performing properly but no
> tone out of the tone generator.
>
> Soldering is easy for me, so if you can point me to the correct
> component, i should be able to make it happy again, and that would be
> awesome!
>
> thanks again for your info so far.
>
> Marcus
> On Sunday, July 18, 2004, at 06:03 PM, x x wrote:
>
> > It is one toshiba chip that needs to be replaced.
> > It is mentioned in the service manual should all work but no sound be
> > heard from the poly 800. Its on the main board. The number of the 
> chip
> > is on my schematics . I cant gurentee it but it is in the service
> > notes. apperntly enough of the same prob happend that this was a 
> major
> > note. Im not saying this is or isnt .But Ive bought a few poly 800s
> > and its one or the other chips for the output control to the sound
> > source of the poly 800....
> > If interested Ill get the part number and email the service note. If
> > you can solder very finely its not a big chip. I dont know if I have 
> a
> > spare im pretty much building up parts to keep for me when this
> > happens again. SinceI have three and I bought some extras let me see
> > what I find out when I look through my parts bin I collect toshiba
> > chips and major processors for the poly .Im now starting to with the
> > juno. I will sale poly 800 keys now and some other stuff .This will
> > also change I bid on every broken one I can find...
> > Peace
> > Alien
> >
> >
> > Marcus Wilson wrote:
> >
> > mines a poly800 yeah
> >
> > all works for midi control
> > no tone generation tho
> >
> > looking for a working tone generator for it
> >
> > Marcus
> > On Saturday, July 17, 2004, at 09:54 AM, x x wrote:
> >
> > > is that a poly 800?
> > >
> > > Marcus Wilson wrote:
> > >
> > > have you got any tone generator chips you could send me?
> > >
> > > my poly works on the digital side, all the patches store etc, midi
> > out
> > > works, just nothing comes out of the tone generator!
> > >
> > > ive put a cro over the data lines, and signals and clock all appear
> > to
> > > be working, just that chip has no output on the tone lines.
> > >
> > > any help available?
> > >
> > > best regards,
> > >
> > > Marcus in Oz
> > > On Saturday, July 17, 2004, at 06:45 AM, x x wrote:
> > >
> > > > I collect dead poly 800s////
> > > >
> > > > skunkride wrote:
> > > >
> > > >
> > > > Nice one Julio !  Gives me hope about my dead Poly....
> > > >
> > > >
> > > >
> > >
> > > >
> > > > Do you Yahoo!?
> > > > Yahoo! Mail - Helps protect you from nasty viruses.
> > >
> > > >
> > > > Yahoo! Groups Links
> > > >
> > > > \ufffd To visit your group on the web, go to:
> > > > http://groups.yahoo.com/group/korgpolyex/
> > > >  
> > > > \ufffd To unsubscribe from this group, send an email to:
> > > > korgpolyex-unsubscribe@yahoogroups.com
> > > >  
> > > > \ufffd Your use of Yahoo! Groups is subject to the Yahoo! Terms of
> > > Service.
> > > >
> > >
> > >
> > >
> >
> > >
> > > Do you Yahoo!?
> > > Vote for the stars of Yahoo!'s next ad campaign!
> >
> > >
> > >
> >
> > >
> > > Yahoo! Groups Links
> > >
> > > \ufffd To visit your group on the web, go to:
> > > http://groups.yahoo.com/group/korgpolyex/
> > >  
> > > \ufffd To unsubscribe from this group, send an email to:
> > > korgpolyex-unsubscribe@yahoogroups.com
> > >  
> > > \ufffd Your use of Yahoo! Groups is subject to the Yahoo! Terms of
> > Service.
> > >
> >
> >
> >
>
> >
> > Do you Yahoo!?
> > Vote for the stars of Yahoo!'s next ad campaign!
>
> >
> >
>
> >
> > Yahoo! Groups Links
> >
> > \ufffd To visit your group on the web, go to:
> > http://groups.yahoo.com/group/korgpolyex/
> >  
> > \ufffd To unsubscribe from this group, send an email to:
> > korgpolyex-unsubscribe@yahoogroups.com
> >  
> > \ufffd Your use of Yahoo! Groups is subject to the Yahoo! Terms of 
> Service.
> >
>
>
>

>
> Do you Yahoo!?
> Vote for the stars of Yahoo!'s next ad campaign!

>
>

>
> Yahoo! Groups Links
>
> \ufffd To visit your group on the web, go to:
> http://groups.yahoo.com/group/korgpolyex/
>  
> \ufffd To unsubscribe from this group, send an email to:
> korgpolyex-unsubscribe@yahoogroups.com
>  
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>

		
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CHEERS!$!@$

will take a look at my stuff n see what i can see!

most grateful thanks!

Marcus

On Wednesday, July 21, 2004, at 06:17 PM, x x wrote:

> let me know if you got my info on the chip # ic 34 page six of the 
> repair manual for vers one and 2 is the same in this realm. TC40H138 
> fails there will be no xound heard for some or all of the groups. This 
> seems logical to assume that since all other functions seem working 
> that this would be the answer.When you get it to work I have patches 
> to trade.Good luck
> Alien
>
> Marcus Wilson <JB@...> wrote:
>
> sounds like an excellent start anyway!@
>
> i have put my poly to one side at the moment, as i had no clue as to
> where to proceed, this at least gives me a direction.
>
> once again thank you for the info, hopefully it will bring one more
> poly back to life!
>
> thanks!
>
> Marcus
> On Monday, July 19, 2004, at 05:34 AM, x x wrote:
>
> > Ok im looking up chip today you will have to find the chip on the net
> > I dont think ill have one to spare. It wasnt easy locating the last
> > set ...
> > It sounds so like the main problem described in the tech notes up 
> date
> > that I fixed a poly with ....
> > Will let you know today.
> > Patrick
> >
> > Marcus Wilson wrote:
> >
> > awesome!~
> > i'd be very keen to find out more.
> >
> > Mine was dead until i replaced a couple of power transistors in the 
> +/-
> > 5V stage that were buggered, and had been poorly messed with by a
> > previous owner.
> > I bought mine for $10 in a carpark junk sale, and took it home,
> > managed to get the midi control side going so now i can control my
> > other gear with the poly,
> >
> > all of the patches etc can be edited stored etc, and i managed to
> > reload factory settings too, but no sound out.
> >
> > It looked like the clock and everything was performing properly but 
> no
> > tone out of the tone generator.
> >
> > Soldering is easy for me, so if you can point me to the correct
> > component, i should be able to make it happy again, and that would be
> > awesome!
> >
> > thanks again for your info so far.
> >
> > Marcus
> > On Sunday, July 18, 2004, at 06:03 PM, x x wrote:
> >
> > > It is one toshiba chip that needs to be replaced.
> > > It is mentioned in the service manual should all work but no sound 
> be
> > > heard from the poly 800. Its on the main board. The number of the
> > chip
> > > is on my schematics . I cant gurentee it but it is in the service
> > > notes. apperntly enough of the same prob happend that this was a
> > major
> > > note. Im not saying this is or isnt .But Ive bought a few poly 800s
> > > and its one or the other chips for the output control to the sound
> > > source of the poly 800....
> > > If interested Ill get the part number and email the service note. 
> If
> > > you can solder very finely its not a big chip. I dont know if I 
> have
> > a
> > > spare im pretty much building up parts to keep for me when this
> > > happens again. SinceI have three and I bought some extras let me 
> see
> > > what I find out when I look through my parts bin I collect toshiba
> > > chips and major processors for the poly .Im now starting to with 
> the
> > > juno. I will sale poly 800 keys now and some other stuff .This will
> > > also change I bid on every broken one I can find...
> > > Peace
> > > Alien
> > >
> > >
> > > Marcus Wilson wrote:
> > >
> > > mines a poly800 yeah
> > >
> > > all works for midi control
> > > no tone generation tho
> > >
> > > looking for a working tone generator for it
> > >
> > > Marcus
> > > On Saturday, July 17, 2004, at 09:54 AM, x x wrote:
> > >
> > > > is that a poly 800?
> > > >
> > > > Marcus Wilson wrote:
> > > >
> > > > have you got any tone generator chips you could send me?
> > > >
> > > > my poly works on the digital side, all the patches store etc, 
> midi
> > > out
> > > > works, just nothing comes out of the tone generator!
> > > >
> > > > ive put a cro over the data lines, and signals and clock all 
> appear
> > > to
> > > > be working, just that chip has no output on the tone lines.
> > > >
> > > > any help available?
> > > >
> > > > best regards,
> > > >
> > > > Marcus in Oz
> > > > On Saturday, July 17, 2004, at 06:45 AM, x x wrote:
> > > >
> > > > > I collect dead poly 800s////
> > > > >
> > > > > skunkride wrote:
> > > > >
> > > > >
> > > > > Nice one Julio !  Gives me hope about my dead Poly....
> > > > >
> > > > >
> > > > >
> > > >
> > > > >
> > > > > Do you Yahoo!?
> > > > > Yahoo! Mail - Helps protect you from nasty viruses.
> > > >
> > > > >
> > > > > Yahoo! Groups Links
> > > > >
> > > > > ë To visit your group on the web, go to:
> > > > > http://groups.yahoo.com/group/korgpolyex/
> > > > >  
> > > > > ë To unsubscribe from this group, send an email to:
> > > > > korgpolyex-unsubscribe@yahoogroups.com
> > > > >  
> > > > > ë Your use of Yahoo! Groups is subject to the Yahoo! Terms of
> > > > Service.
> > > > >
> > > >
> > > >
> > > >
> > >
> > > >
> > > > Do you Yahoo!?
> > > > Vote for the stars of Yahoo!'s next ad campaign!
> > >
> > > >
> > > >
> > >
> > > >
> > > > Yahoo! Groups Links
> > > >
> > > > ‘ To visit your group on the web, go to:
> > > > http://groups.yahoo.com/group/korgpolyex/
> > > >  
> > > > ‘ To unsubscribe from this group, send an email to:
> > > > korgpolyex-unsubscribe@yahoogroups.com
> > > >  
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> > > Service.
> > > >
> > >
> > >
> > >
> >
> > >
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> >
> > >
> > >
> >
> > >
> > > Yahoo! Groups Links
> > >
> > > Ô To visit your group on the web, go to:
> > > http://groups.yahoo.com/group/korgpolyex/
> > >  
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> > Service.
> > >
> >
> >
> >
>
> >
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> >
> >
>
> >
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> >
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> >  
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> Service.
> >
>
>
>
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hi,

If you don't have schematics you can find it here:
http://www.oldcrows.net/~patchell/poly800/poly800.html

ic 34 is responsible for scanning of the keyboard matrix.
So, if you say midi out is ok then this ic is not defective.
If ic34 is defective, you still should have sound when using midi in.

If you have an oscilloscope you can check pins 28 to 36 of ic 3 for tone 
output.

This is the sound generator ic.

Please check and report.

BTW, TC40H138 is a very common ic.
If you can't find the toshiba version, there are plenty of other 
manufacturers that produce this ic.

Regards,

Andre

Marcus Wilson wrote:

> CHEERS!$!@$
> 
> will take a look at my stuff n see what i can see!
> 
> most grateful thanks!
> 
> Marcus
> 
> On Wednesday, July 21, 2004, at 06:17 PM, x x wrote:
> 
>     let me know if you got my info on the chip # ic 34 page six of the
>     repair manual for vers one and 2 is the same in this realm. TC40H138
>     fails there will be no xound heard for some or all of the groups.
>     This seems logical to assume that since all other functions seem
>     working that this would be the answer.When you get it to work I have
>     patches to trade.Good luck
>     Alien
> 
>     */Marcus Wilson <JB@...>/* wrote:
> 
>     sounds like an excellent start anyway!@
> 
>     i have put my poly to one side at the moment, as i had no clue as to
>     where to proceed, this at least gives me a direction.
> 
>     once again thank you for the info, hopefully it will bring one more
>     poly back to life!
> 
>     thanks!
> 
>     Marcus
>     On Monday, July 19, 2004, at 05:34 AM, x x wrote:
> 
>      > Ok im looking up chip today you will have to find the chip on the
>     net
>      > I dont think ill have one to spare. It wasnt easy locating the last
>      > set ...
>      > It sounds so like the main problem described in the tech notes up
>     date
>      > that I fixed a poly with ....
>      > Will let you know today.
>      > Patrick
>      >
>      > Marcus Wilson wrote:
>      >
>      > awesome!~
>      > i'd be very keen to find out more.
>      >
>      > Mine was dead until i replaced a couple of power transistors in
>     the +/-
>      > 5V stage that were buggered, and had been poorly messed with by a
>      > previous owner.
>      > I bought mine for $10 in a carpark junk sale, and took it home,
>      > managed to get the midi control side going so now i can control my
>      > other gear with the poly,
>      >
>      > all of the patches etc can be edited stored etc, and i managed to
>      > reload factory settings too, but no sound out.
>      >
>      > It looked like the clock and everything was performing properly
>     but no
>      > tone out of the tone generator.
>      >
>      > Soldering is easy for me, so if you can point me to the correct
>      > component, i should be able to make it happy again, and that
>     would be
>      > awesome!
>      >
>      > thanks again for your info so far.
>      >
>      > Marcus
>      > On Sunday, July 18, 2004, at 06:03 PM, x x wrote:
>      >
>      > > It is one toshiba chip that needs to be replaced.
>      > > It is mentioned in the service manual should all work but no
>     sound be
>      > > heard from the poly 800. Its on the main board. The number of the
>      > chip
>      > > is on my schematics . I cant gurentee it but it is in the service
>      > > notes. apperntly enough of the same prob happend that this was a
>      > major
>      > > note. Im not saying this is or isnt .But Ive bought a few poly
>     800s
>      > > and its one or the other chips for the output control to the sound
>      > > source of the poly 800....
>      > > If interested Ill get the part number and email the service
>     note. If
>      > > you can solder very finely its not a big chip. I dont know if I
>     have
>      > a
>      > > spare im pretty much building up parts to keep for me when this
>      > > happens again. SinceI have three and I bought some extras let
>     me see
>      > > what I find out when I look through my parts bin I collect toshiba
>      > > chips and major processors for the poly .Im now starting to
>     with the
>      > > juno. I will sale poly 800 keys now and some other stuff .This
>     will
>      > > also change I bid on every broken one I can find...
>      > > Peace
>      > > Alien
>      > >
>      > >
>      > > Marcus Wilson wrote:
>      > >
>      > > mines a poly800 yeah
>      > >
>      > > all works for midi control
>      > > no tone generation tho
>      > >
>      > > looking for a working tone generator for it
>      > >
>      > > Marcus
>      > > On Saturday, July 17, 2004, at 09:54 AM, x x wrote:
>      > >
>      > > > is that a poly 800?
>      > > >
>      > > > Marcus Wilson wrote:
>      > > >
>      > > > have you got any tone generator chips you could send me?
>      > > >
>      > > > my poly works on the digital side, all the patches store etc,
>     midi
>      > > out
>      > > > works, just nothing comes out of the tone generator!
>      > > >
>      > > > ive put a cro over the data lines, and signals and clock all
>     appear
>      > > to
>      > > > be working, just that chip has no output on the tone lines.
>      > > >
>      > > > any help available?
>      > > >
>      > > > best regards,
>      > > >
>      > > > Marcus in Oz
>      > > > On Saturday, July 17, 2004, at 06:45 AM, x x wrote:
>      > > >
>      > > > > I collect dead poly 800s////
>      > > > >
>      > > > > skunkride wrote:
>      > > > >
>      > > > >
>      > > > > Nice one Julio !  Gives me hope about my dead Poly....
>      > > > >
>      > > > >
>      > > > >
>      > > >
>      > > > >
>      > > > > Do you Yahoo!?
>      > > > > Yahoo! Mail - Helps protect you from nasty viruses.
>      > > >
>      > > > >
>      > > > > Yahoo! Groups Links
>      > > > >
>      > > > > ë To visit your group on the web, go to:
>      > > > > http://groups.yahoo.com/group/korgpolyex/
>      > > > >  
>      > > > > ë To unsubscribe from this group, send an email to:
>      > > > > korgpolyex-unsubscribe@yahoogroups.com
>      > > > >  
>      > > > > ë Your use of Yahoo! Groups is subject to the Yahoo! Terms of
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As i said ic34 is responsible for scanning the keyboard, so if this ic 
is defective, you won't hear a sound. So far the manual is right.
However, since Marcus said midi out is ok, i presume that the keyboard 
is working, otherwise you'd have no midi output, except for the sequencer.
Maybe Marcus can reply to confirm this.

English is not my first language , so i hope you understand.
Please send me page 6 and if possible the complete manual.

Regards

Andre

x x wrote:

> Then why does it say on page six that if no sound is heard at all that 
> this is the cause?
> I can email the page to you Andre...
> Inm just wondering.
> 
> */Andr\ufffd_Schaap <andre@...>/* wrote:
> 
>     hi,
> 
>     If you don't have schematics you can find it here:
>     http://www.oldcrows.net/~patchell/poly800/poly800.html
> 
>     ic 34 is responsible for scanning of the keyboard matrix.
>     So, if you say midi out is ok then this ic is not defective.
>     If ic34 is defective, you still should have sound when using midi in.
> 
>     If you have an oscilloscope you can check pins 28 to 36 of ic 3 for
>     tone
>     output.
> 
>     This is the sound generator ic.
> 
>     Please check and report.
> 
>     BTW, TC40H138 is a very common ic.
>     If you can't find the toshiba version, there are plenty of other
>     manufacturers that produce this ic.
> 
>     Regards,
> 
>     Andre
> 
>     Marcus Wilson wrote:
>      > CHEERS!$!@$
>      >
>      > will take a look at my stuff n see what i can see!
>      >
>      > most grateful thanks!
>      >
>      > Marcus
>      >
>      > On Wednesday, July 21, 2004, at 06:17 PM, x x wrote:
>      >
>      > let me know if you got my info on the chip # ic 34 page six of the
>      > repair manual for vers one and 2 is the same in this realm. TC40H138
>      > fails there will be no xound heard for some or all of the groups.
>      > This seems logical to assume that since all other functions seem
>      > working that this would be the answer.When you get it to work I have
>      > patches to trade.Good luck
>      > Alien
>      >
>      > */Marcus Wilson /* wrote:
>      >
>      > sounds like an excellent start anyway!@
>      >
>      > i have put my poly to one side at the moment, as i had no clue as to
>      > where to proceed, this at least gives me a direction.
>      >
>      > once again thank you for the info, hopefully it will bring one more
>      > poly back to life!
>      >
>      > thanks!
>      >
>      > Marcus
>      > On Monday, July 19, 2004, at 05:34 AM, x x wrote:
>      >
>      > > Ok im looking up chip today you will have to find the chip on the
>      > net
>      > > I dont think ill have one to spare. It wasnt easy locating the last
>      > > set ...
>      > > It sounds so like the main problem described in the tech notes up
>      > date
>      > > that I fixed a poly with ....
>      > > Will let you know today.
>      > > Patrick
>      > >
>      > > Marcus Wilson wrote:
>      > >
>      > > awesome!~
>      > > i'd be very keen to find out more.
>      > >
>      > > Mine was dead until i replaced a couple of power transistors in
>      > the +/-
>      > > 5V stage that were buggered, and had been poorly messed with by a
>      > > previous owner.
>      > > I bought mine for $10 in a carpark junk sale, and took it home,
>      > > managed to get the midi control side going so now i can control my
>      > > other gear with the poly,
>      > >
>      > > all of the patches etc can be edited stored etc, and i managed to
>      > > reload factory settings too, but no sound out.
>      > >
>      > > It looked like the clock and everything was performing properly
>      > but no
>      > > tone out of the tone generator.
>      > >
>      > > Soldering is easy for me, so if you can point me to the correct
>      > > component, i should be able to make it happy again, and that
>      > would be
>      > > awesome!
>      > >
>      > > thanks again for your info so far.
>      > >
>      > > Marcus
>      > > On Sunday, July 18, 2004, at 06:03 PM, x x wrote:
>      > >
>      > > > It is one toshiba chip that needs to be replaced.
>      > > > It is mentioned in the service manual should all work but no
>      > sound be
>      > > > heard from the poly 800. Its on the main board. The number of the
>      > > chip
>      > > > is on my schematics . I cant gurentee it but it is in the service
>      > > > notes. apperntly enough of the same prob happend that this was a
>      > > major
>      > > > note. Im not saying this is or isnt .But Ive bought a few poly
>      > 800s
>      > > > and its one or the other chips for the output control to the
>     sound
>      > > > source of the poly 800....
>      > > > If interested Ill get the part number and email the service
>      > note. If
>      > > > you can solder very finely its not a big chip. I dont know if I
>      > have
>      > > a
>      > > > spare im pretty much building up parts to keep for me when this
>      > > > happens again. SinceI have three and I bought some extras let
>      > me see
>      > > > what I find out when I look through my parts bin I collect
>     toshiba
>      > > > chips and major processors for the poly .Im now starting to
>      > with the
>      > > > juno. I will sale poly 800 keys now and some other stuff .This
>      > will
>      > > > also change I bid on every broken one I can find...
>      > > > Peace
>      > > > Alien
>      > > >
>      > > >
>      > > > Marcus Wilson wrote:
>      > > >
>      > > > mines a poly800 yeah
>      > > >
>      > > > all works for midi control
>      > > > no tone generation tho
>      > > >
>      > > > looking for a working tone generator for it
>      > > >
>      > > > Marcus
>      > > > On Saturday, July 17, 2004, at 09:54 AM, x x wrote:
>      > > >
>      > > > > is that a poly 800?
>      > > > >
>      > > > > Marcus Wilson wrote:
>      > > > >
>      > > > > have you got any tone generator chips you could send me?
>      > > > >
>      > > > > my poly works on the digital side, all the patches store etc,
>      > midi
>      > > > out
>      > > > > works, just nothing comes out of the tone generator!
>      > > > >
>      > > > > ive put a cro over the data lines, and signals and clock all
>      > appear
>      > > > to
>      > > > > be working, just that chip has no output on the tone lines.
>      > > > >
>      > > > > any help available?
>      > > > >
>      > > > > best regards,
>      > > > >
>      > > > > Marcus in Oz
>      > > > > On Saturday, July 17, 2004, at 06:45 AM, x x wrote:
>      > > > >
>      > > > > > I collect dead poly 800s////
>      > > > > >
>      > > > > > skunkride wrote:
>      > > > > >
>      > > > > >
>      > > > > > Nice one Julio ! Gives me hope about my dead Poly....
>      > > > > >
>      > > > > >
>      > > > > >
>      > > > >
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Do you Yahoo!?
Yahoo! Mail is new and improved - Check it out!

well as its a poly800 forum, and about poly800 issues, keeping it a 
matter of public record is of service to subscribers i would have 
thought,

not as if we are trying to sell monitors or anything....

Marcus
On Thursday, July 22, 2004, at 04:59 AM, skunkride wrote:

> Hey guys (Andre & Marcus) - just thought to let you know that every 
> mail you send
> reach all the people here on the Poly group so....
>
<image.tiff>
>
>
<image.tiff>

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>

G'day Andre,

yes the poly midi out works fine, controlling a voce electric piano.

i previously determined there was clock and signal gettting to the tone  
generator, but no sound out on its output ports,
so i figured that was the defective port.

best regards,

Marcus

On Thursday, July 22, 2004, at 02:25 AM, Andre Schaap wrote:

> As i said ic34 is responsible for scanning the keyboard, so if this ic
> is defective, you won't hear a sound. So far the manual is right.
> However, since Marcus said midi out is ok, i presume that the keyboard
> is working, otherwise you'd have no midi output, except for the  
> sequencer.
> Maybe Marcus can reply to confirm this.
>
> English is not my first language , so i hope you understand.
> Please send me page 6 and if possible the complete manual.
>
> Regards
>
> Andre
>
> x x wrote:
>> Then why does it say on page six that if no sound is heard at all that
>> this is the cause?
>> I can email the page to you Andre...
>> Inm just wondering.
>>
>> */André_Schaap <andre@...>/* wrote:
>>
>>     hi,
>>
>>     If you don't have schematics you can find it here:
>>     http://www.oldcrows.net/~patchell/poly800/poly800.html
>>
>>     ic 34 is responsible for scanning of the keyboard matrix.
>>     So, if you say midi out is ok then this ic is not defective.
>>     If ic34 is defective, you still should have sound when using midi  
>> in.
>>
>>     If you have an oscilloscope you can check pins 28 to 36 of ic 3  
>> for
>>     tone
>>     output.
>>
>>     This is the sound generator ic.
>>
>>     Please check and report.
>>
>>     BTW, TC40H138 is a very common ic.
>>     If you can't find the toshiba version, there are plenty of other
>>     manufacturers that produce this ic.
>>
>>     Regards,
>>
>>     Andre
>>
>>     Marcus Wilson wrote:
>>> CHEERS!$!@$
>>>
>>> will take a look at my stuff n see what i can see!
>>>
>>> most grateful thanks!
>>>
>>> Marcus
>>>
>>> On Wednesday, July 21, 2004, at 06:17 PM, x x wrote:
>>>
>>> let me know if you got my info on the chip # ic 34 page six of the
>>> repair manual for vers one and 2 is the same in this realm. TC40H138
>>> fails there will be no xound heard for some or all of the groups.
>>> This seems logical to assume that since all other functions seem
>>> working that this would be the answer.When you get it to work I have
>>> patches to trade.Good luck
>>> Alien
>>>
>>> */Marcus Wilson /* wrote:
>>>
>>> sounds like an excellent start anyway!@
>>>
>>> i have put my poly to one side at the moment, as i had no clue as to
>>> where to proceed, this at least gives me a direction.
>>>
>>> once again thank you for the info, hopefully it will bring one more
>>> poly back to life!
>>>
>>> thanks!
>>>
>>> Marcus
>>> On Monday, July 19, 2004, at 05:34 AM, x x wrote:
>>>
>>>> Ok im looking up chip today you will have to find the chip on the
>>> net
>>>> I dont think ill have one to spare. It wasnt easy locating the last
>>>> set ...
>>>> It sounds so like the main problem described in the tech notes up
>>> date
>>>> that I fixed a poly with ....
>>>> Will let you know today.
>>>> Patrick
>>>>
>>>> Marcus Wilson wrote:
>>>>
>>>> awesome!~
>>>> i'd be very keen to find out more.
>>>>
>>>> Mine was dead until i replaced a couple of power transistors in
>>> the +/-
>>>> 5V stage that were buggered, and had been poorly messed with by a
>>>> previous owner.
>>>> I bought mine for $10 in a carpark junk sale, and took it home,
>>>> managed to get the midi control side going so now i can control my
>>>> other gear with the poly,
>>>>
>>>> all of the patches etc can be edited stored etc, and i managed to
>>>> reload factory settings too, but no sound out.
>>>>
>>>> It looked like the clock and everything was performing properly
>>> but no
>>>> tone out of the tone generator.
>>>>
>>>> Soldering is easy for me, so if you can point me to the correct
>>>> component, i should be able to make it happy again, and that
>>> would be
>>>> awesome!
>>>>
>>>> thanks again for your info so far.
>>>>
>>>> Marcus
>>>> On Sunday, July 18, 2004, at 06:03 PM, x x wrote:
>>>>
>>>>> It is one toshiba chip that needs to be replaced.
>>>>> It is mentioned in the service manual should all work but no
>>> sound be
>>>>> heard from the poly 800. Its on the main board. The number of the
>>>> chip
>>>>> is on my schematics . I cant gurentee it but it is in the service
>>>>> notes. apperntly enough of the same prob happend that this was a
>>>> major
>>>>> note. Im not saying this is or isnt .But Ive bought a few poly
>>> 800s
>>>>> and its one or the other chips for the output control to the
>>     sound
>>>>> source of the poly 800....
>>>>> If interested Ill get the part number and email the service
>>> note. If
>>>>> you can solder very finely its not a big chip. I dont know if I
>>> have
>>>> a
>>>>> spare im pretty much building up parts to keep for me when this
>>>>> happens again. SinceI have three and I bought some extras let
>>> me see
>>>>> what I find out when I look through my parts bin I collect
>>     toshiba
>>>>> chips and major processors for the poly .Im now starting to
>>> with the
>>>>> juno. I will sale poly 800 keys now and some other stuff .This
>>> will
>>>>> also change I bid on every broken one I can find...
>>>>> Peace
>>>>> Alien
>>>>>
>>>>>
>>>>> Marcus Wilson wrote:
>>>>>
>>>>> mines a poly800 yeah
>>>>>
>>>>> all works for midi control
>>>>> no tone generation tho
>>>>>
>>>>> looking for a working tone generator for it
>>>>>
>>>>> Marcus
>>>>> On Saturday, July 17, 2004, at 09:54 AM, x x wrote:
>>>>>
>>>>>> is that a poly 800?
>>>>>>
>>>>>> Marcus Wilson wrote:
>>>>>>
>>>>>> have you got any tone generator chips you could send me?
>>>>>>
>>>>>> my poly works on the digital side, all the patches store etc,
>>> midi
>>>>> out
>>>>>> works, just nothing comes out of the tone generator!
>>>>>>
>>>>>> ive put a cro over the data lines, and signals and clock all
>>> appear
>>>>> to
>>>>>> be working, just that chip has no output on the tone lines.
>>>>>>
>>>>>> any help available?
>>>>>>
>>>>>> best regards,
>>>>>>
>>>>>> Marcus in Oz
>>>>>> On Saturday, July 17, 2004, at 06:45 AM, x x wrote:
>>>>>>
>>>>>>> I collect dead poly 800s////
>>>>>>>
>>>>>>> skunkride wrote:
>>>>>>>
>>>>>>>
>>>>>>> Nice one Julio ! Gives me hope about my dead Poly....
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>>
>>>>>>> Do you Yahoo!?
>>>>>>> Yahoo! Mail - Helps protect you from nasty viruses.
>>>>>>
>>>>>>>
>>>>>>> Yahoo! Groups Links
>>>>>>>
>>>>>>> ë To visit your group on the web, go to:
>>>>>>> http://groups.yahoo.com/group/korgpolyex/
>>>>>>>
>>>>>>> ë To unsubscribe from this group, send an email to:
>>>>>>> korgpolyex-unsubscribe@yahoogroups.com
>>>>>>>
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>>>>>> Service.
>>>>>>>
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>>>>>>
>>>>>
>>>>>>
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>>>>>> Vote for the stars of Yahoo!'s next ad campaign!
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