Re: Poly-800 Service Manual Posted
2009-02-27 by korgpolyex800
Gordon, I just popped all of this into a PDF and it is now sitting in the Poly 800 service files section. Welcome to posterity! Mike. ... supply ... going ...
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Re: o-scope-o-rama
2009-02-27 by selloutdesigns
I also just picked up a cheap 20Mhz scope on eBay (Lab-Volt AA-793G) for $27. I m impatiently waiting for it to arrive so I can poke at my dead Poly some more.
Re: [korgpolyex] Poly-800 Service Manual Posted
2009-02-27 by Gordon JC Pearce
... Great, thanks for this. Now we can see what the deal is with the joystick board ;-) Look at page 6 of the PDF, in the bottom left of the circuit diagram.
Re: Poly-800 Service Manual Posted
2009-02-27 by jusufzemplin
... Thank you very much. I think, the most important is, we have finally some closer info about MS5232 (pages 29,30) !! -))
Re: o-scope-o-rama
2009-02-26 by mark_r_abcd
... trace, there is another input on back) If it s on the back then it s more likely a Z-axis input rather than another trace. This input allows you to
o-scope-o-rama
2009-02-26 by Russ
i picked up a BK scope on ebay a month ago. just set up your search to exclude anything above 20mhz, tektronix and HP scopes and you will be able to find
Poly-800 Service Manual Posted
2009-02-26 by selloutdesigns
I just posted a PDF of the Poly-800 Mk1 service manual in the files area. I found this scan at http://www.paintingwithsound.co.nz/manuals.htm and got
Re: [korgpolyex] Re: Dead 800
2009-02-25 by Michael Hawkins
If you have goop from what might have been a battery leak then things can look OK but turn out to be alot worse than you think. Nevertheless, you might be OK.
Re: [korgpolyex] Re: Dead 800
2009-02-25 by Gordon JC Pearce
... Any dual-trace scope. One of the good things about oscilloscopes is that you can pick up a perfectly good older scope for very little, which will do
RE: [korgpolyex] Re: Dead 800
2009-02-25 by LARRY HAWKE
There is an electronic surplus shop down the street that has literally hundreds of O-scopes. Also, you can get PC-based units that range in price from $50
Re: Dead 800
2009-02-25 by selloutdesigns
I haven t actually tested the LED displays themselves, but since the display driver chips (IC30 and 31) are not outputting anything to the LED s int he display
RE: [korgpolyex] Re: Dead 800
2009-02-25 by LARRY HAWKE
Do you think there s the slightest possibility the display itself might be dead? To: korgpolyex@yahoogroups.com From: aah_public@comcast.net Date: Wed, 25
Re: Dead 800
2009-02-25 by selloutdesigns
Took another look internally last night. There was some sticky gunk on some of the boards which may have been from a battery compartment leak at some point,
Re: [korgpolyex] Re: Dead 800
2009-02-24 by Michael Hawkins
Aaron, you should check all voltage rails. especially +5 and -5 volt rails. The power supply of the Poly is somewhat reliable. Note the somewhat . Sometimes
Re: Dead 800
2009-02-24 by selloutdesigns
I gave this a try on my dead Poly, but no luck. It seems that VR1 adjusts the +5V rail voltage and subsequently the supply voltage to the CPU, but in my case
Re: [korgpolyex] Re: Missing Joystick board (KLM-599) "mod"
2009-02-24 by Michael Hawkins
that s fantastic news! good job! ________________________________ From: serotonic_sound To: korgpolyex@yahoogroups.com Sent: Monday,
Dead 800
2009-02-23 by Russ
I had this problem a while ago and got her back upby fiddling with one of the VR pots. Cant recal which one did it. But one of them seemed to control voltage
Re: Need some assitance in reviving a troubled Poly 800 Mk1
2009-02-23 by selloutdesigns
MIDI In/Out appears to be non-responsive. I connected the Out and ran a MIDI monitor and saw no activity coming through (and no blinky lights on my MIDI
Re: Need some assitance in reviving a troubled Poly 800 Mk1
2009-02-23 by narfman96
I don t think you could measure the RES 5.5 and 6.5 with a DVM very well since it s such a low duty cycle pulse. You re seeing 1.45v on the RES 7.5 line which
Re: Missing Joystick board (KLM-599) "mod"
2009-02-23 by serotonic_sound
I finally got some more time to spend with the poly-800. It seems that the 0 to 5v on 1-4B and 1-5B with 10K linear pots does actually work and provide what
Re: [korgpolyex] Re: Need some assitance in reviving a troubled Poly 800 Mk1
2009-02-23 by Alec Jahn
In my experience, the tape-in is really picky about volume. You could spend hours incrementing it to try and get a good blind load and then still get nowhere
Re: [korgpolyex] pitchbend joystick
2009-02-23 by Michael Hawkins
Is your Poly spitting out MG or Pitch Bend messages? ________________________________ From: Russ To: korgpolyex@yahoogroups.com Sent:
Re: Need some assitance in reviving a troubled Poly 800 Mk1
2009-02-23 by selloutdesigns
I didn t try sysex (don t think the stock Poly 800 1 has any sysex capability), but I did try loading up the factory patches via the cassette interface. I had
Re: Need some assitance in reviving a troubled Poly 800 Mk1
2009-02-23 by Erik Hines
Have you tried sending a SYSX dump of the original patches to the Poly? I have found MANY a poly ex that were sold at garage sales and thrift stores because
Need some assitance in reviving a troubled Poly 800 Mk1
2009-02-22 by selloutdesigns
Stop me if you ve heard this one before...Bought an As Is Poly on eBay. Cleaned it up, plugged it in a lo and behold no display. Sound is present at the
pitchbend joystick
2009-02-22 by Russ
On one of my 800s the joystick continually spits out data. Tried cleaning it, no change. Tried yanking it. No change. I ll be watching to see how this fellow
Re: [korgpolyex] Re: Missing Joystick board (KLM-599) "mod"
2009-02-19 by Gordon J. C. Pearce MM3YEQ
... I ve actually measured it on my Poly-800, and it swings from 0 to 4 volts, not 5 volts. The opamp keeps the pitch bend voltage centred around 2v (so that
RE: [korgpolyex] Re: Missing Joystick board (KLM-599) "mod"
2009-02-19 by LARRY HAWKE
After looking at the pics of that Poly 800, I realized that my unit is in near-new condition. I only have slight wear around the joystick, and a couple of the
Re: [korgpolyex] Re: Missing Joystick board (KLM-599) "mod"
2009-02-19 by Michael Hawkins
I haven t had a chance to take a long, hard look at the joystick circuit yet. But I can tell you from memory that there are a bunch of op amps on that little
Re: [korgpolyex] Re: EX-800 midi out
2009-02-19 by Michael Hawkins
Hi Chris, keep in mind that the HAWK-800 upgrade kit changes all that. http://www.hawk800.com ... Mike ________________________________ From: chris_nairn
Re: [korgpolyex] Re: Missing Joystick board (KLM-599) "mod"
2009-02-19 by Gordon J. C. Pearce MM3YEQ
... The pots on the joystick say 10K B. I suspect they re 10k over a very short swing though, because obviously they can t turn through a wide angle. ...
Re: Missing Joystick board (KLM-599) "mod"
2009-02-19 by serotonic_sound
... The pots I have are new 10K linear pots and they indeed look/feel linear when I measure them on my voltmeter. I think all they say is 10K B somewhere
Re: EX-800 midi out
2009-02-18 by chris_nairn
I found elsewhere on line that the EX midi out is for dupming only. Bummer. ... to ... work
Re: EX-800 midi out
2009-02-18 by chris_nairn
I found elsewhere on line that the EX midi out is for dupming only. Bummer. ... to ... work
Re: [korgpolyex] Re: Missing Joystick board (KLM-599) "mod"
2009-02-18 by Gordon J. C. Pearce MM3YEQ
... The pots are a bit funny, with a kind of centre-tap on them. As far as the output from the joystick board goes, there are two connectors - CN1B and CN8B.
Re: [korgpolyex] Re: Missing Joystick board (KLM-599) "mod"
2009-02-18 by Michael Hawkins
Tim, I recommend you wait until we have a bit more discussion about the operation of the joystick board. I wouldn t want to see you blow your Poly up. I am
EX-800 midi out
2009-02-18 by chris_nairn
I don t have the manual for my EX-800. I wanted to use the sequencer to control another synth. Can I do this on the EX-800? I assumed I could because I can on
Re: Missing Joystick board (KLM-599) "mod"
2009-02-18 by serotonic_sound
I ve been fiddling around with crossing the wires from the 1b connector that went to the missing joystick board and have managed to thoroughly confuse myself.
Re: Missing Joystick board (KLM-599) "mod"
2009-02-18 by zoinky420
... deadzone only?) ... Sounds like a liner pot being used where a log one should be used. Or vice-versa. ... Both left posts are ... other middle post is ...
Re: Missing Joystick board (KLM-599) "mod"
2009-02-18 by serotonic_sound
No luck, the pitch pot still only works for the first half of its range. :( But the mod pot now controls the vcf instead of the dco, When this pot is full
Re: [korgpolyex] Re: Jupiter vs Poly
2009-02-17 by Epiik Soul
Off Topic
Re: [korgpolyex] Re: Missing Joystick board (KLM-599) "mod"
2009-02-17 by Michael Hawkins
Hi Tim, let s try this. Connect the -5V side of the pots to ground. Mike. ________________________________ From: serotonic_sound To:
Re: Jupiter vs Poly
2009-02-17 by serotonic_sound
... Well, I always aim to impress...Any impression is a good impression right? Oh no, wait, that s press not impression ... crap. Anyway...I m not exactly
Re: Jupiter vs Poly
2009-02-17 by zoinky420
... Off-topic, but I rarely see someone corrected about multiple claims in a long post react in a non-defensive hostile manner. Your response to being
Re: Missing Joystick board (KLM-599) "mod"
2009-02-17 by serotonic_sound
Actually, I wasn t quite right in my description. The vcf isn t affected at all by the mod pot. -Tim ... know ... 15 ... to ... the ... assembly. ... the ...
Re: Missing Joystick board (KLM-599) "mod"
2009-02-17 by serotonic_sound
Hey Mike, Thanks for your help...I did what you recommended...I m not sure what you were expecting the results to be but I m getting the following: 1) The
Re: Jupiter vs Poly
2009-02-16 by serotonic_sound
Oh SNAP! Looks like my plan to take over the world through misinforming the public was foiled again...dammit Doug...next time...! :) ... Yeah, I just fired up
Re: Jupiter vs Poly
2009-02-16 by synthparts
I know this isn t a Jupiter forum (for that go to www.roland-jupiter.org) but you are obviously badly misinformed on the JP-6. The filters do not oscillate. It
Re: [korgpolyex] Re: Moog Slayer + 12/24 db Filter Mod complete!...
2009-02-15 by David Mochen
Hi, For those of you who have jumped on the modding thing relatively lately, I invite you to check my Poly 800 s photos
Re: [korgpolyex] Re: Moog Slayer + 12/24 db Filter Mod complete!...
2009-02-15 by Alec Jahn
I fully intended to move and/or heatshrink that connection, but was in a hurry to leave the house and wanted to test it out.