[sdiy] Korg Polysix major problems - Update

[Karl Ekdahl]

So, i've gone through the synth again. The dead data lines i talked about turned out to indeed be working, i was mistaken in believing that they were output lines while they were in fact input lines (or bidirectional). I'm at a loss at this point what the hell is going on with this machine so i believe a new 8049 is in order... perhaps a new 8048 as well - it still bugs me though that i have spares of both processors and they all behave the same way, it doesn't make any sense.

If there are any polysix-experts out there i plead for your help.

Karl


--- Den fre 2008-10-24 skrev Ullrich Peter <Peter.Ullrich at kapsch.net>:

> Från: Ullrich Peter <Peter.Ullrich at kapsch.net>
> Ämne: Re: [sdiy] Korg Polysix major problems - Update
> Till: "Bob Weigel" <sounddoctorin at imt.net>, "elektrodwarf at yahoo.se" <elektrodwarf at yahoo.se>
> Kopia: "synth-diy at dropmix.xs4all.nl" <synth-diy at dropmix.xs4all.nl>
> Datum: fredag 24 oktober 2008 22.56
> Hallo Bob and Karl!
> 
> Maybe the testing and calibration description in the
> Polysix service manual can help you.
> You can find the complete service manual (not only the
> schematics like on most Polysic sites) on Florian Anwanders
> site:
> http://fa.utfs.org/diy/korgpolysix/polysix_service_manual.pdf
> 
> Regarding which CPU could be dead: Due to your description
> I would say the key assigner chip 8049 on the
> board KLM-366 is dead or not working due to other reasons.
> 
> Ciao
> Peter
> 
> http://www.ullrich.at.tt
> 
> 
> ________________________________________
> Von: synth-diy-bounces at dropmix.xs4all.nl
> [synth-diy-bounces at dropmix.xs4all.nl] im Auftrag von Bob
> Weigel [sounddoctorin at imt.net]
> Gesendet: Freitag, 24. Oktober 2008 20:55
> An: elektrodwarf at yahoo.se
> Cc: synth-diy at dropmix.xs4all.nl
> Betreff: Re: [sdiy] Korg Polysix major problems - Update
> 
> Hmm...yeah that doesnt' sound real likely.  Like I say
> I had an 8049 go
> down recently while troubleshooting the other board which
> was bizarre.
> Swapped in the chip from a spare board and voila.  But
> I'd have to
> review diagram for that section to think of some good
> procedures and I'm
> a bit busy for a few days here.  Maybe somebody else has a
> thought off
> the top on that.  Trying to recall how the reset line is on
> that cpu
> etc. -Bob
> 
> Karl Ekdahl wrote:
> 
> >Guys
> >
> >One last question before i give up on this CPU; how
> common is the problem of the CPU dying and *which* CPU are
> we talking about, the 8048 or the 8049 (i believe the latter
> might be my problem). The reason i'm asking is because i
> in fact have two sets of boards for the polysix and each
> board behaves the same which i thought was kinda weird. I
> have of course tried swapping the CPUs inbetween the boards
> as well as hooking up all of the boards with eachother in
> different configurations.
> >
> >Karl
> >
> >
> >--- Den fre 2008-10-24 skrev Ullrich Peter
> <Peter.Ullrich at kapsch.net>:
> >
> >
> >
> >>Från: Ullrich Peter
> <Peter.Ullrich at kapsch.net>
> >>Ämne: Re: [sdiy] Korg Polysix major problems -
> Update
> >>Till: "elektrodwarf at yahoo.se"
> <elektrodwarf at yahoo.se>, "Bob Weigel"
> <sounddoctorin at imt.net>,
> "synth-diy at dropmix.xs4all.nl"
> <synth-diy at dropmix.xs4all.nl>
> >>Datum: fredag 24 oktober 2008 08.26
> >>Hallo Karl!
> >>
> >>It seems that you could use a new programmed 8748
> or 8749
> >>microcontroller.
> >>As you are from Sweden as your emailaddress tells
> me you
> >>may be interested
> >>in getting a new microcontroller from me.
> >>
> >>I need to have a look but I am quite sure that I
> still have
> >>some left.
> >>It would cost 10 Euro + postage.
> >>
> >>Mail me privately if your interested and I will
> have a look
> >>if I can find
> >>A chip.
> >>
> >>Tip: If your existing microcontroller is socketed
> (normally
> >>they are) try
> >>To remove it and put it in again - maybe the
> malfunction it
> >>is just because
> >>of corrosion.
> >>
> >>Ciao
> >>Peter
> >>
> >>http://www.ullrich.at.tt
> >>
> >>
> >>-----Ursprüngliche Nachricht-----
> >>Von: synth-diy-bounces at dropmix.xs4all.nl
> >>[mailto:synth-diy-bounces at dropmix.xs4all.nl] Im
> Auftrag von
> >>Karl Ekdahl
> >>Gesendet: Freitag, 24. Oktober 2008 04:27
> >>An: Bob Weigel; synth-diy at dropmix.xs4all.nl
> >>Betreff: Re: [sdiy] Korg Polysix major problems -
> Update
> >>
> >>
> >>Bob
> >>
> >>
> >>
> >>>Well normally there will be a dead or multiple
> dead
> >>>
> >>>
> >>lines that should
> >>
> >>
> >>>be chugging away with the clock generating data
> and
> >>>
> >>>
> >>addresses.
> >>
> >>Oh no, i just verified that out of the eight lines
> going
> >>out of the processor (pin 34-27) only two are
> actually
> >>having any data on them, the others are totally
> stale.
> >>
> >>
> >>
> >>>And then you
> >>>have to establish if it's the cpu or
> something
> >>>
> >>>
> >>pulling a line down.
> >>
> >>Hmm.. i didn't even realize these lines both go
> to the
> >>keyboard as well as to the KLM-371 - perhaps if i
> disconnect
> >>the cable to that board i'll at least see on
> which board
> >>the problem is.
> >>
> >>
> >>
> >>>The code is inside of course so unless it's
> >>>
> >>>
> >>rapidly halting for some
> >>
> >>
> >>>reason there should be stuff going on with all
> those
> >>>
> >>>
> >>lines.
> >>
> >>
> >>> I can't
> >>>recall off the top how reset etc. are set up on
> that
> >>>
> >>>
> >>chip so consult
> >>
> >>
> >>>diagram and besure those lines are doing what
> they
> >>>
> >>>
> >>should do also.
> >>
> >>
> >>>Usually held low a reset is active to keep the
> chip
> >>>
> >>>
> >>out of the game.
> >>
> >>
> >>>-Bob
> >>>
> >>>
> >>Now i'm a little confused; are we talking
> hardware
> >>(memory) reset or a soft reset while power is on? I
> know
> >>there's a reset POT on the KLM-371 board but i
> don't
> >>really know what it's doing, guess i've
> gotta dig
> >>into the 8048/8049 datasheets...
> >>
> >>As it does seem like i might need a new processor,
> did you
> >>say you had some? Would you be ok parting with one
> in that
> >>case and for how much?
> >>
> >>Thanks
> >>
> >>Karl
> >>
> >>
> >>
> >>>Karl Ekdahl wrote:
> >>>
> >>>
> >>>
> >>>>So, it turns out that there is a good clock
> going
> >>>>
> >>>>
> >>to
> >>
> >>
> >>>IC4 / IC5 that handles the gates, it's just
> not
> >>>
> >>>
> >>doing anything - the
> >>
> >>
> >>>data coming in seems fine and the reset is
> constantly
> >>>
> >>>
> >>held HIGH as far
> >>
> >>
> >>>as i can tell. I desoldered IC4 and tried
> triggering
> >>>
> >>>
> >>the gate on voice
> >>
> >>
> >>>4 manually and indeed it works just fine! The
> thing is
> >>>
> >>>
> >>though that it
> >>
> >>
> >>>doesn't change frequency when i push any of
> the
> >>>
> >>>
> >>keys and the D/A i've
> >>
> >>
> >>>verified to work so perhaps there's
> something else
> >>>
> >>>
> >>busted in the
> >>
> >>
> >>>keyboard section?
> >>>
> >>>
> >>>>
> >>>>
> >>>>
> >>>>>I've had a cpu go bad on that
> board.
> >>>>>
> >>>>>
> >>>That'd be
> >>>
> >>>
> >>>>>first guess. You can of
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>How do i verify if the CPU is dead?
> >>>>
> >>>>Thanks
> >>>>
> >>>>Karl
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>__________________________________________________________
> >>
> >>
> >>>>Låna pengar utan säkerhet. Jämför
> vilkor
> >>>>
> >>>>
> >>online hos
> >>
> >>
> >>>Kelkoo.
> >>>
> >>>http://www.kelkoo.se/c-100390123-lan-utan-sakerhet.html?partnerId=969
> >>>
> >>>
> >>>>15014
> >>>>
> >>>>_______________________________________________
> >>>>Synth-diy mailing list
> >>>>Synth-diy at dropmix.xs4all.nl
> >>>>
> >>>>
> >>>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >>>
> >>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>
> >>__________________________________________________________
> >>Går det långsamt? Skaffa dig en snabbare
> >>bredbandsuppkoppling.
> >>Sök och jämför priser hos Kelkoo.
> >>http://www.kelkoo.se/c-100015813-bredband.html?partnerId=96914325
> >>
> >>_______________________________________________
> >>Synth-diy mailing list
> >>Synth-diy at dropmix.xs4all.nl
> >>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >>
> >>
> >
> >
> >     
> ___________________________________________________
> >Sök efter kärleken!
> >Hitta din tvillingsjäl på Yahoo! Dejting:
> http://ad.doubleclick.net/clk;185753627;24584539;x?http://se.meetic.yahoo.net/index.php?mtcmk=148783
> >
> >_______________________________________________
> >Synth-diy mailing list
> >Synth-diy at dropmix.xs4all.nl
> >http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >
> >
> >
> >
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy


      __________________________________________________________
Ta semester! - sök efter resor hos Kelkoo.
Jämför pris på flygbiljetter och hotellrum här:
http://www.kelkoo.se/c-169901-resor-biljetter.html?partnerId=96914052