Korg Poly800/EX800 Users

Hey all,

My actual name's Mike Marcus, I joined the group because I just bought an EX-800 (via Reverb.com). I only started using it yesterday, so all I've been able to do so far is go through the presets and figure out how to change settings. When I first connected the unit, it was doing this thing where the sound it was putting out was extremely faint. I could barely make out anything at all, either with headphones or via the line outs. After trying a number different things, unplugging and re-plugging in the cables, powercycling the unit, cursing a bit, it started playing at a reasonable volume. What's odd is that turning the volume knob doesn't seem to have an effect on the level, at least until I turn it completely off. I also noticed the occasional noise, which could be a scratchy pot. However, when I was first trying to get volume out of it, I didn't hear any scratching when I turned the knob. My question is this: could shipping the EX-800 have jostled it, setting something loose in the process? Is there anything I should look for? Do you have any recommendations for going over a unit like this? I was thinking I might take some DeoxIT to the knobs. All in all it appears to be in excellent condition.

I was planning on doing the various mods (HAWK-800, AtomaHawk, not sure what else yet) eventually anyway, so I'm not averse to opening the thing up.

Thanks for the add,
- Mike

On Mon, 10/9/17, tonsil@... [korgpolyex] <korgpolyex@yahoogroups.com> wrote:

Subject: [korgpolyex] Introducing Myself - and a question
To: korgpolyex@yahoogroups.com
Received: Monday, October 9, 2017, 5:05 PM


 









Hey all,

My actual name's Mike Marcus, I joined the
group because I just bought an EX-800 (via Reverb.com). I
only started using it yesterday, so all I've been able
to do so far is go through the presets and figure out how to
change settings. When I first connected the unit, it was
doing this thing where the sound it was putting out was
extremely faint. I could barely make out anything at all,
either with headphones or via the line outs. After trying a
number different things, unplugging and re-plugging in the
cables, powercycling the unit, cursing a bit, it started
playing at a reasonable volume. What's odd is that
turning the volume knob doesn't seem to have an effect
on the level, at least until I turn it completely off. I
also noticed the occasional noise, which could be a scratchy
pot. However, when I was first trying to get volume out of
it, I didn't hear any scratching when I turned the knob.
My question is this: could shipping the EX-800 have jostled
it, setting something loose in the process? Is there
anything I should look for? Do you have any recommendations
for going over a unit like this? I was thinking I might take
some DeoxIT to the knobs. All in all it appears to be in
excellent condition.

I was
planning on doing the various mods (HAWK-800, AtomaHawk, not
sure what else yet) eventually anyway, so I'm not averse
to opening the thing up.

Thanks for the add,
- Mike











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yes.

On October 9, 2017 at 6:54 PM "charles chop charleschop@... [korgpolyex]" <korgpolyex@yahoogroups.com> wrote:

 

do u know what a variable resistor is?

--------------------------------------------
On Mon, 10/9/17, tonsil@... [korgpolyex] <korgpolyex@yahoogroups.com> wrote:

Subject: [korgpolyex] Introducing Myself - and a question
To: korgpolyex@yahoogroups.com
Received: Monday, October 9, 2017, 5:05 PM


 









Hey all,

My actual name's Mike Marcus, I joined the
group because I just bought an EX-800 (via Reverb.com). I
only started using it yesterday, so all I've been able
to do so far is go through the presets and figure out how to
change settings. When I first connected the unit, it was
doing this thing where the sound it was putting out was
extremely faint. I could barely make out anything at all,
either with headphones or via the line outs. After trying a
number different things, unplugging and re-plugging in the
cables, powercycling the unit, cursing a bit, it started
playing at a reasonable volume. What's odd is that
turning the volume knob doesn't seem to have an effect
on the level, at least until I turn it completely off. I
also noticed the occasional noise, which could be a scratchy
pot. However, when I was first trying to get volume out of
it, I didn't hear any scratching when I turned the knob.
My question is this: could shipping the EX-800 have jostled
it, setting something loose in the process? Is there
anything I should look for? Do you have any recommendations
for going over a unit like this? I was thinking I might take
some DeoxIT to the knobs. All in all it appears to be in
excellent condition.

I was
planning on doing the various mods (HAWK-800, AtomaHawk, not
sure what else yet) eventually anyway, so I'm not averse
to opening the thing up.

Thanks for the add,
- Mike











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On Mon, 10/9/17, tonsil@... [korgpolyex] <korgpolyex@yahoogroups.com> wrote:

Subject: Re: [korgpolyex] Introducing Myself - and a question
To: korgpolyex@yahoogroups.com
Received: Monday, October 9, 2017, 8:42 PM


 










yes.On October 9, 2017 at 6:54 PM
"charles chop charleschop@... [korgpolyex]"
<korgpolyex@yahoogroups.com> wrote:

  do u know what
a variable resistor is?


--------------------------------------------
On Mon, 10/9/17, tonsil@...
[korgpolyex] <korgpolyex@yahoogroups.com> wrote:

Subject: [korgpolyex]
Introducing Myself - and a question
To:
korgpolyex@yahoogroups.com
Received:
Monday, October 9, 2017, 5:05 PM


 









Hey
all,

My actual name's
Mike Marcus, I joined the
group because I
just bought an EX-800 (via Reverb.com). I

only started using it yesterday, so all I've been
able
to do so far is go through the presets
and figure out how to
change settings. When
I first connected the unit, it was
doing
this thing where the sound it was putting out was
extremely faint. I could barely make out
anything at all,
either with headphones or
via the line outs. After trying a
number
different things, unplugging and re-plugging in the
cables, powercycling the unit, cursing a bit,
it started
playing at a reasonable volume.
What's odd is that
turning the volume
knob doesn't seem to have an effect
on
the level, at least until I turn it completely off. I
also noticed the occasional noise, which could
be a scratchy
pot. However, when I was
first trying to get volume out of
it, I
didn't hear any scratching when I turned the knob.
My question is this: could shipping the EX-800
have jostled
it, setting something loose in
the process? Is there
anything I should
look for? Do you have any recommendations

for going over a unit like this? I was thinking I might
take
some DeoxIT to the knobs. All in all
it appears to be in
excellent condition.

I was

planning on doing the various mods (HAWK-800, AtomaHawk,
not
sure what else yet) eventually anyway,
so I'm not averse
to opening the thing
up.

Thanks for the
add,
- Mike











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I have a Eurorack system, and I've done DIY modules for that (through hole, not surface mount). I also built an MDRONE from Evaton Technologies, a 3 square wave oscillator standalone synth. Nothing ridiculous, but I know how to solder and test connections.

On October 9, 2017 at 8:48 PM "charles chop charleschop@... [korgpolyex]" <korgpolyex@yahoogroups.com> wrote:

 

do u have much electronic background?
--------------------------------------------
On Mon, 10/9/17, tonsil@... [korgpolyex] <korgpolyex@yahoogroups.com> wrote:

Subject: Re: [korgpolyex] Introducing Myself - and a question
To: korgpolyex@yahoogroups.com
Received: Monday, October 9, 2017, 8:42 PM


 










yes.On October 9, 2017 at 6:54 PM
"charles chop charleschop@... [korgpolyex]"
<korgpolyex@yahoogroups.com> wrote:

  do u know what
a variable resistor is?


--------------------------------------------
On Mon, 10/9/17, tonsil@...
[korgpolyex] <korgpolyex@yahoogroups.com> wrote:

Subject: [korgpolyex]
Introducing Myself - and a question
To:
korgpolyex@yahoogroups.com
Received:
Monday, October 9, 2017, 5:05 PM


 









Hey
all,

My actual name's
Mike Marcus, I joined the
group because I
just bought an EX-800 (via Reverb.com). I

only started using it yesterday, so all I've been
able
to do so far is go through the presets
and figure out how to
change settings. When
I first connected the unit, it was
doing
this thing where the sound it was putting out was
extremely faint. I could barely make out
anything at all,
either with headphones or
via the line outs. After trying a
number
different things, unplugging and re-plugging in the
cables, powercycling the unit, cursing a bit,
it started
playing at a reasonable volume.
What's odd is that
turning the volume
knob doesn't seem to have an effect
on
the level, at least until I turn it completely off. I
also noticed the occasional noise, which could
be a scratchy
pot. However, when I was
first trying to get volume out of
it, I
didn't hear any scratching when I turned the knob.
My question is this: could shipping the EX-800
have jostled
it, setting something loose in
the process? Is there
anything I should
look for? Do you have any recommendations

for going over a unit like this? I was thinking I might
take
some DeoxIT to the knobs. All in all
it appears to be in
excellent condition.

I was

planning on doing the various mods (HAWK-800, AtomaHawk,
not
sure what else yet) eventually anyway,
so I'm not averse
to opening the thing
up.

Thanks for the
add,
- Mike











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> I don't think there's any problem with the patch memory. Once the EX-800 started producing sound (and I'm still not sure why it wasn't initially) I was able to go through all the presets successfully. I opened it up and checked the battery - it's in place on the main board. I didn't test it, but it looks like it's where it's supposed to be. I attached a photo of the insides.
>

> So, just to follow up, I think I figured out the problem. There must have been some gunk in the pots that was causing a problem. I bought some DeoxIT that arrived today, so I hit the pots with it, particularly the volume control. I let it dry for a while, closed it back up, and now it behaves like it's supposed to. The volume actually changes when you turn the knob, so hooray! I think this poor module must have seen some abuse (smoke?) because now I noticed that the program/parameter button isn't always registering. Ah well, the beauty of vintage synths, yeah? It's all good, I've been enjoying playing it.
>
> Thanks for the suggestions!
> - Mike

Probably. I was looking here: https://groups.yahoo.com/neo/groups/korgpolyex/files/2%29%20EX-800/Servicing/

In there it says the switches are no longer available. Is that still true? Is there an equivalent replacement part I can get? I can try to clean the existing ones and see what happens.

Apologies if I'm asking questions that have been answered a dozen times. It's hard to sift through 16 years of group discussion. Please point me to a FAQ, etc. if there is one and I'll stop blathering ;)

- Mike Marcus

On October 13, 2017 at 2:55 AM "Gordonjcp gordon@... [korgpolyex]" <korgpolyex@yahoogroups.com> wrote:

 

On Fri, Oct 13, 2017 at 02:29:10AM +0000, tonsil@... [korgpolyex] wrote:
> So, just to follow up, I think I figured out the problem. There must have been some gunk in the pots that was causing a problem. I bought some DeoxIT that arrived today, so I hit the pots with it, particularly the volume control. I let it dry for a while, closed it back up, and now it behaves like it's supposed to. The volume actually changes when you turn the knob, so hooray! I think this poor module must have seen some abuse (smoke?) because now I noticed that the program/parameter button isn't always registering. Ah well, the beauty of vintage synths, yeah? It's all good, I've been enjoying playing it.
>
> Thanks for the suggestions!
> - Mike

Could just be that the tact switch has worn out. You can buy
replacements, and it's worth getting all of them out if you do one
because the rest won't be much better and they'll feel different.

--
Gordonjcp MM0YEQ

On Fri, 10/13/17, tonsil@... [korgpolyex] <korgpolyex@yahoogroups.com> wrote:

Subject: Re: [korgpolyex] Re: Introducing Myself - and a question
To: korgpolyex@yahoogroups.com
Received: Friday, October 13, 2017, 12:02 PM


 










Probably. I was looking
here: https://groups.yahoo.com/neo/groups/korgpolyex/files/2%29%20EX-800/Servicing/
In there it says the
switches are no longer available. Is that still true? Is
there an equivalent replacement part I can get? I can try to
clean the existing ones and see what happens.

Apologies if I'm
asking questions that have been answered a dozen times.
It's hard to sift through 16 years of group discussion.
Please point me to a FAQ, etc. if there is one and I'll
stop blathering ;)

- Mike Marcus
On October 13, 2017 at 2:55
AM "Gordonjcp gordon@... [korgpolyex]"
<korgpolyex@yahoogroups.com> wrote:

  On Fri, Oct 13,
2017 at 02:29:10AM +0000, tonsil@... [korgpolyex]
wrote:
> So, just to follow up, I think
I figured out the problem. There must have been some gunk in
the pots that was causing a problem. I bought some DeoxIT
that arrived today, so I hit the pots with it, particularly
the volume control. I let it dry for a while, closed it back
up, and now it behaves like it's supposed to. The volume
actually changes when you turn the knob, so hooray! I think
this poor module must have seen some abuse (smoke?) because
now I noticed that the program/parameter button isn't
always registering. Ah well, the beauty of vintage synths,
yeah? It's all good, I've been enjoying playing it.

>
> Thanks for the
suggestions!
> - Mike


Could just be that the tact switch has
worn out. You can buy
replacements, and
it's worth getting all of them out if you do one
because the rest won't be much better and
they'll feel different.

--
Gordonjcp MM0YEQ


 










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