Korg Poly800/EX800 Users

The four "main" pins are nothing. They just ground the outer metal shell of
the switch and keep it securely on the board. There are only two pins that
matter, and you can see which two they are by looking at which pins actually
have something connected to them. When enabled, these two pins are shorted
together ( less than 0.5 ohms with an ohmmeter). When disabled, they are not
connected to each other (greater than 10 Meg ohms between them).

 

Don B.

 

  _____  

From: korgpolyex@yahoogroups.com [mailto:korgpolyex@yahoogroups.com] On
Behalf Of cc0919ship
Sent: Saturday, January 19, 2013 10:51 PM
To: korgpolyex@yahoogroups.com
Subject: [korgpolyex] Re: Frozen Poly 800

 

  

Thanks for the suggestions. I took a look, sequencer was disabled. Perhaps
the switch is bad? I'm not sure how to test it, it has 4 main pins, then 14
smaller pins. I'm using a multimeter, but can't figure out what pins the
switch is effecting.

--- In korgpolyex@yahoogroups.com <mailto:korgpolyex%40yahoogroups.com> ,
"backshall1" wrote:
>
> That sound like the sequencer "enable" switch is on, plus you have no
> patches in memory. The sequencer switch on the back should be set to
> "disable" unless you are recording a sequence. Since this is an original
> Poly 800, there are several versions, some with a CR2032 lithium cell
inside
> to hold the sound patches in memory when it is turned off, and some
without.
> Since you just changed the battery, the memory will be empty or really
> random.
> 
> 1) Make sure the sequencer is switched to disable.
> 
> 2) You need to reload the factory patches or program one of your own for
> testing purposes.
> 
> If you've never loaded a patch audio file (.wav) on the "Tape In" jack of
an
> early 80's synth, you may want to start by just programming one of your
own.
> Unfortunately there are 50 parameters and you need to make sure all of
them
> are set at something reasonable to get a sound. You might start by setting
> the Attack, Decay and Release to 0 and the Break P, Sustain to maximum
(31)
> for Deg1, Deg2 and Deg3. I don't think the Slope matters when set this
way.
> If you hear noise, then alter parameter 33 (Noise level) to see if it
makes
> a difference. Oh, and parameter 41 (Cutoff) should be turned up full
during
> this testing.
> 
> 
> 
> If the sequencer switch is really the main problem, then you should be
able
> to get some sound out of it and we can help you get the factory patches
> loaded if you need help.
> 
> 
> 
> Don Backshall
> 
> 
> 
> _____ 
> 
> From: korgpolyex@yahoogroups.com <mailto:korgpolyex%40yahoogroups.com>
[mailto:korgpolyex@yahoogroups.com <mailto:korgpolyex%40yahoogroups.com> ]
On
> Behalf Of cc0919ship
> Sent: Saturday, January 19, 2013 9:32 PM
> To: korgpolyex@yahoogroups.com <mailto:korgpolyex%40yahoogroups.com> 
> Subject: [korgpolyex] Frozen Poly 800
> 
> 
> 
> 
> 
> Hello all,
> 
> I'm wondering if you can help me out. I recently acquired a broken Poly
800
> (original, not MKII.) It powers up, but immediately after powering up, the
> screen reads "1.8 50 01." Buttons on the front panel do nothing, and keys
do
> not make noise. If I turn up the volume the whole way, I can hear the
filter
> sweeping up and down. Here's where it gets interesting - I plugged in a
MIDI
> keyboard, and when I play notes with the MIDI keyboard, the 800 makes
static
> noises, and the last value on the screen increments by one.
> 
> I opened it up, checked the tactile switches (all seem fine.) I also
> replaced the internal CMOS battery. I was under the impression that MKI
800s
> didn't have this, so the main board may have been replaced by someone
along
> the line.
> 
> Anyway, has anyone had a problem like this and could help me out? It is
> potentially one of the ICs, but I have no idea how to test them.
> 
> Thanks,
> 
> Christian
>