Yesterday I managed to rewire D00 and replaced IC31 but nothing
changed, effect speed LFO continued accelerating itself and that
strange connectivity issues were present.
Just to shed some light. The connectivity issues could be just related
to my inexperience dealing with measurement equipment, because I use
the Diode-measure mode, which is expected to "bip" if there is a
short, and what I get a negative measure (-837)which undoubtedly bips
on mi multimeter. unfortunately I don't know what kind of measure it
is (Volts, milivolts, amperes...) If it can help, it is exactly the
same measure that I get when measuring D15, where the voltage drop is
exactly what the battery is delivering (3.02) and obviously I've
checked the diode and it is OK.
Thank you very much for all your help. I will spend some time checking
traces and, if I can't find what's wrong, I will get back to you to
send the board to your more skilled hands.
--- In PolySix@yahoogroups.com, klosmon <klosmon@...> wrote:
>
> There shouldn't be any connectivity -- either there's a short you
> haven't found yet, or there's a problem with IC 31.
> I've about reached the limit of my long-distance diagnostic ability....
>
>
> ~G
> choco wrote:
> >
> > Hi!
> >
> > After cutting almost every trace on the D00 bus i realised that that
> > wasn't the matter of that short I discovered before.
> >
> > In fact I'm not sure about what's happening, but I will try to explain
> > it, maybe you will find it normal.
> >
> > Does it make any sense to you? (with the battery placed in the holder)
> > There is connectivity between the positive side of the battery and the
> > output of an AND gate on IC31 (Pin 6),(giving a value as if it were an
> > inverse diode or something like that) when plugging the negative probe
> > on the battery side, but it gives no connectivity when changing the
> > probes??
> >
> > When removing the battery no connectivity issues are shown
beetween them.
> >
> > It seems something normal related to the values that the latch
> > delivers when the battery is in place, but I have not the tools to
> > measure this kind of logical issues and also I am not skilled to
do it.
> >
> > Any Idea that could affect to the effect speed?
> >
> > Thank you one more time... now it's time to rewire D00 :(
> >
> > --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com>,
> > klosmon <klosmon@> wrote:
> > >
> > > Sounds like D00 is shorted; start by cutting the traces to that line
> > > around IC31 -- if the short goes away, you know where to look.
If not,
> > > cut the D00 trace to each of the other ICs & connectors, one at
a time,
> > > checking the status of the short as you go.
> > >
> > > ~G
> > > choco wrote:
> > > >
> > > > Hi.
> > > >
> > > > I've checked tha traces and seemed to be ok, but accidentaly I
found
> > > > something that I didn't understand.
> > > >
> > > > The D00 (CN06-3) seems to be connected to the +3.6 pin of the
battery
> > > > (and to the new diode which replaced the resistor there), and
also to
> > > > the D15 anode (which is really close to that trace). I removed
the new
> > > > diode and soldered it to the battery old soldering point which
was not
> > > > used and goes through the other side of the board. I cut the trace
> > > > which connected the battery to the old resistor just for
checking, but
> > > > the connection was still there.
> > > >
> > > > Does it make any sense to you? The tracks and the board seem
to be in
> > > > good condition and the battery didn't almost leak when I
replaced it,
> > > > but it sounds to me that the board could be conductive or
something
> > > > like that.
> > > >
> > > > I just wanted to ask you before cutting all the traces on the
board...
> > > >
> > > > Maybe tomorrow I will try to remove all the D00 traces and
make cable
> > > > connections.
> > > >
> > > > Thank you!
> > > >
> > > > --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com>
> > <mailto:PolySix%40yahoogroups.com>,
> > > > klosmon <klosmon@> wrote:
> > > > >
> > > > > Most likely cause is another bad trace.
> > > > > Check all the traces to CN06 (D00 - D03; P10 - P13).
> > > > > Also keep in mind that these signals each have to connect to
several
> > > > > points on the board (for example, D00 connects to IC31-6,
IC26-4,
> > > > > CN06-3, IC28-4, IC34-4, etc etc).
> > > > >
> > > > > ~G
> > > > >
> > > > > choco wrote:
> > > > > >
> > > > > > Hi!
> > > > > >
> > > > > > Finnaly I managed to repair it! It was just a track that I cut
> > > > > > accedentally and was under a printed number on the board
(it was
> > > > > > almost impossible to see it)
> > > > > >
> > > > > > Now I've got another problem. The synth sounds ok, it
stores the
> > > > > > presets and so on, but it seems to be a problem with the
> > modulation
> > > > > > section that it doesn't had before I managed to change the
> > battery.
> > > > > >
> > > > > > What happens is: when i switch the P6 on the LFO led starts
> > flashing
> > > > > > faster and faster and every change of the pots doesn't affect
> > to it.
> > > > > > Did you encounter this problem before? I've tried to do the
> > Modulation
> > > > > > adjustment but the VR changes doesn't seem to affect to
the signal
> > > > > > that is delivered to CN03-5. Well, I'm doing it with a digital
> > > > > > voltimeter which stands to measure Hz, but maybe that's
not a good
> > > > way...
> > > > > >
> > > > > > any idea?
> > > > > >
> > > > > > Thank you in advance.
> > > > > >
> > > > > > --- In PolySix@yahoogroups.com
> > <mailto:PolySix%40yahoogroups.com> <mailto:PolySix%40yahoogroups.com>
> > > > <mailto:PolySix%40yahoogroups.com>,
> > > > > > "choco" <ignaciojimenez@> wrote:
> > > > > > >
> > > > > > > Hi-
> > > > > > >
> > > > > > > Thank you for your fast and kind reply.
> > > > > > >
> > > > > > > I have visited your website several times when doing
> > research for my
> > > > > > > P6 and I had you in mind as an option if I couldn't work it
> > out. My
> > > > > > > synth comes from the states and I was bothered about
sending it
> > > > back,
> > > > > > > but I've never thought before about sending just the board.
> > It's a
> > > > > > > great option.
> > > > > > >
> > > > > > > I'll check one more time that traces and maybe I will
> > re-solder them
> > > > > > > and the socket more accurately just for testing.
> > > > > > >
> > > > > > > Probably I will contact you in a week if I can't arrange to
> > > > repair it.
> > > > > > >
> > > > > > > And maybe I'll think about getting a scope.
> > > > > > >
> > > > > > > Thank you!
> > > > > > >
> > > > > > > --- In PolySix@yahoogroups.com
> > <mailto:PolySix%40yahoogroups.com>
> > > > <mailto:PolySix%40yahoogroups.com>
<mailto:PolySix%40yahoogroups.com>,
> > > > > > klosmon <klosmon@> wrote:
> > > > > > > >
> > > > > > > > Hello-
> > > > > > > > Having repaired many of these, I would suggest that
the most
> > > > likely
> > > > > > > > cause is damaged traces due to the battery leak.
> > > > > > > > Even if the board looks good, the traces around IC31
> > (which you
> > > > > > > > replaced) are VERY delicate, and carry data lines that, if
> > > > damaged,
> > > > > > > > effect all of the functions of the synth.
> > > > > > > >
> > > > > > > > If you have any experience with electronics, get hold
of the
> > > > > > schematic
> > > > > > > > and use a continuity tester to test all traces from
that IC;
> > > > if you
> > > > > > > > have a scope, that's even faster.
> > > > > > > >
> > > > > > > > If not, you can send me the CPU board & I can look it
over for
> > > > you.
> > > > > > > >
> > > > > > > > ~GMM
> > > > > > > > analogsynthervice.com
> > > > > > > >
> > > > > > > >
> > > > > > > > choco wrote:
> > > > > > > > >
> > > > > > > > > Hi!
> > > > > > > > >
> > > > > > > > > After digging within the messages I haven't found any
> > similar
> > > > > > > > > situation, so I decided to post.
> > > > > > > > >
> > > > > > > > > I bought a year ago and old polysix and it sounded
fine to
> > > > me (maybe
> > > > > > > > > lower than expected, I use it with an old guitar
tube amp
> > > > and I have
> > > > > > > > > to select the high output with master at 12 o'clock to
> > get it at
> > > > > > > > > almost the same level as the guitar is)
> > > > > > > > >
> > > > > > > > > A mounth ago I noticed that I had lost all my patches
> > (although
> > > > > > it was
> > > > > > > > > sounding great and every pot worked fine). I did know
> > about the
> > > > > > > > > battery issues, but it hadn't worried me until that
moment.
> > > > I opened
> > > > > > > > > the polysix and noticed that the battery mounting clamps
> > > > were broken
> > > > > > > > > and the batery was not feeding the klm367A anymore.
> > > > > > > > >
> > > > > > > > > Well, it had leaked a little bit, but the circuit
was almost
> > > > perfect
> > > > > > > > > and there were no signs of corrosion elsewhere. I
cleaned
> > > > all the
> > > > > > > > > board with alcohol and care, replaced the battery
and the
> > > > 74LS08N
> > > > > > > > > which is next to it just for security and then I made a
> > mistake.
> > > > > > > > >
> > > > > > > > > I broke a trace and shorted accidentaly 5V and ground.
> > > > > > > > >
> > > > > > > > > After testing and noticing what the matter was, I
> > removed that
> > > > > > mistake
> > > > > > > > > and everything seemed to work fine (the leds and so
on), but
> > > > when I
> > > > > > > > > pluged the P6 to an amp (to the earphones too), I
noticed
> > > > that it
> > > > > > > > > sounded weak and something like distorted. almost
every pot
> > > > didn't
> > > > > > > > > affect as expected.
> > > > > > > > >
> > > > > > > > > Do you have any idea of what can happen to my
beloved P6?Any
> > > > measure
> > > > > > > > > that I could take from it to get deeper into?
Unfortunately
> > > > I don't
> > > > > > > > > have an osciloscope to take accurate measures...
> > > > > > > > >
> > > > > > > > > I also had a problem with 15Volt line, all the LEDs were
> > ON when
> > > > > > > > > starting up the P6, but never went OFF. In addition to
> > it, the
> > > > > > > > > Modulation LFO LED started blinking every time faster
> > and faster
> > > > > > until
> > > > > > > > > it seemed to be just static ON. I solved it regulating
> > the 15V
> > > > > > pot to
> > > > > > > > > get over 15.05 on my meter.
> > > > > > > > >
> > > > > > > > > I will continue testing it, but it seems that I have
reached
> > > > my best
> > > > > > > > > effort in front of it, and here in Spain it's almost
> > impossible
> > > > > > > > > finding a qualified vintage synth tech.
> > > > > > > > >
> > > > > > > > > Thank you in advance.
> > > > > > > > >
> > > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > [Non-text portions of this message have been removed]
> > > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > > >
> > > > > [Non-text portions of this message have been removed]
> > > > >
> > > >
> > > >
> > >
> > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> >
> >
>
>
>
> [Non-text portions of this message have been removed]
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