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