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, 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>,
> > 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>,
> > > > "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>,
> > > > 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]
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