I am scanning page six of the real manual and sending.....
Andre Schaap <aschaap@...> 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.
>
> ∗/Andr�_Schaap /∗ 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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