Hi,
Great!! That's good information, I'll do the tests with my scope and
let you know,
thanks,
Han.
--- In
PolySix@yahoogroups.com, Johannes Hausensteiner <johau@g...>
wrote:
>
> Hi,
>
> I do not want to discouorage you, but I do not believe that it is
> the KLM-367's CPU. This does only the programmer. You can check
> it very easily:
> 1) If you have an oscilloscope, put one probe to TP4 and trigger
> on this signal. There should be a narrow pulse about every
20msec.
> The other probe connect to TP2. Obtain GND at TP3.
> On TP2 you can see the multiplexed control voltages coming out
of
> the programmer CPU. Now turn knobs on the control panel and
you see
> a corresponding bar moving up and down between -5 and +5V.
> 2) If you do not have an oscilloscope you can measure on CN05
(green
> wires to KLM-366) single control voltages. The connector
contacts
> are labeled on the PCB, e.g. EG INT is pin10. Moving knobs on
the
> control panel should result in a moving corresponding control
> voltage -5 ..+5V.
>
> If this does work then IC22 (8048 CPU) is OK. If not then you may
want
> to go for a new CPU, which can be difficult because you need a
correctly
> programmed CPU. Either you watch out for a cannibalised Polysix or
you
> get a 8748, which is the EPROM version of the chip. This can be
really
> difficult as it is very outdated. Nowadays people make their
homebrew
> micro stuff with PICs or the like. Then you have to have the
programming
> file a possiblity to program it. So before going through all this
and
> then finding out that it was not the reason it is worth to look a
bit
> deeper into it and check for other causes...
> As I know from repairing some battery-leakage victims, IC31 is the
first
> candidate to be replaced. It acts as a data bus buffer and all the
data
> is passing through it.
> An even more simple check of functionality of IC22 CPU is whether
it is
> possible to change patches in the sense that the correct LEDs
within
> the PATCH an BANK buttons come up.
> If yes then IC22 is OK.
> If no then first check for correct CPU clock and RST signals
(perform
> RESET adjustment as given in the service manual).
>
> If you have no sound at all for no obvious reason, check the Tape
Enable
> (nTE) signal, which comes from the TAPE ENABLE switch, disables the
> overall VCA via IC5 and IC35 and holds the voices' gate latches
(IC4,
> IC5 on ∗KLM-366∗) in reset state.
>
> Good luck!
>
> Johannes
>
>
>
> hansomchaam wrote:
> > Hello,
> > Every suggestion from everyone given to me (thanks) I have tried
but
> > still no sound.
> > The problem seems to be in the 8048 processor on KLM367. The
> > outputsignal on pin 19 (DB7) has his pattern but some levels are
> > higher than + 5 volt, it looks like an open line (not
terminated),
> > when I pull down it (10 k) it's gone but why??
> > So I'm thinking on replacing the processor and asking is this
still
> > for sale somewhere (or replacement).
> > Please give me suggestions (where to buy).
> > Thanks,
> > Han.
> > --- In PolySix@yahoogroups.com, "FRANK SPANO" <fspa8724@m...>
wrote:
> >
> >>Thanks, I'll try that
> >>
> >>
> >>
> >>>From: "lnz2166" <lnz2166@y...>
> >>>Reply-To: PolySix@yahoogroups.com
> >>>To: PolySix@yahoogroups.com
> >>>Subject: [PolySix] Re: Polysix no sound
> >>>Date: Tue, 06 Dec 2005 06:59:25 -0000
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>This might sound trivial but is your power supply output all in
> >>>
> >>>check. In addition have you checked the the solder pads on the
> >
> > power
> >
> >>>connectors. I had and issue with one poly6 where the 15v solder
> >
> > pad
> >
> >>>on the connector was lifted. Also do a sanity check and make
sure
> >
> > you
> >
> >>>chips are all getting proper voltages. Check old crows site for
a
> >>>
> >>>scanned service manual.
> >>>
> >>>
> >>>
> >>>http://www.oldcrows.net/
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>--- In PolySix@yahoogroups.com, "FRANK SPANO" <fspa8724@m...>
> >
> > wrote:
> >
> >>>>I have a similar problem. Does anyone have a scanned service
> >
> > manual
> >
> >>>I can
> >>>
> >>>
> >>>>get emailed? Greatly appreciated
> >>>
> >>>>>From: "gil_we" <gil_we@y...>
> >>>
> >>>>>Reply-To: PolySix@yahoogroups.com
> >>>
> >>>>>To: PolySix@yahoogroups.com
> >>>
> >>>>>Subject: [PolySix] Re: Polysix no sound
> >>>
> >>>>>Date: Mon, 05 Dec 2005 08:56:38 -0000
> >>>
> >>>>>I think the service manual have this information...
> >>>
> >>>>>--- In PolySix@yahoogroups.com, "hansomchaam"
> >
> > <hansomchaam@y...>
> >
> >>>>>wrote:
> >>>
> >>>>>>Thanks for reply, I fixed the battery problem as described.
> >>>
> >>>>>>I checked (again) all connections/signals with an
> >
> > oscilloscoop.
> >
> >>>>>>I don't see any output, also no gate signals when key-
> >
> > stroke on
> >
> >>>ic5
> >>>
> >>>
> >>>>>>KLM-366.
> >>>
> >>>>>>What shape must be on TP2 KLM367?
> >>>
> >>>>>>Thanks for your help.
> >>>
> >>>>>>Han
> >>>
> >>>>>>--- In PolySix@yahoogroups.com, "gil_we" <gil_we@y...>
> >
> > wrote:
> >
> >>>>>>>How are the main voltages ? Has the battery leaked ?
> >>>
> >>>>>>>--- In PolySix@yahoogroups.com, "hansomchaam"
> >>>
> >>><hansomchaam@y...>
> >>>
> >>>>>>>wrote:
> >>>
> >>>>>>>>Hello,
> >>>
> >>>>>>>>Again here is a polysix with the "no sound at all"
> >
> > problem.
> >
> >>>>>>>>When I measure with oscilloscoop on KLM366 (new) ic 9
> >
> > pin 1
> >
> >>>>>>there
> >>>
> >>>>>>>is a
> >>>
> >>>>>>>>constant pattern but not a 0.5 V/oct. Keystrokes has no
> >>>
> >>>effect
> >>>
> >>>
> >>>>>>at
> >>>
> >>>>>>>all,
> >>>
> >>>>>>>>processor 8049 gives signals on DB0..DB8. Also no
> >
> > output on
> >
> >>>>>gate
> >>>
> >>>>>>>0...3
> >>>
> >>>>>>>>= pin 15,10,7,2 ic 5 on keystroke.
> >>>
> >>>>>>>>Does anyone has suggestions.
> >>>
> >>>>>>>>Please help me, I look forward to hear the nice sound
> >
> > again.
> >
> >>>>>>>>Thans,
> >>>
> >>>>>>>>Han.
> >>>
> >>>>>PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> >>>
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> >>>
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> >>>
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> >
> > of
> >
> >>>Service.
> >>>
> >>>
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