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.... > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > 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! 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Message
Re: [korgpolyex] Reanimator (about my dead poly800mk2)
2004-07-21 by Andre Schaap