Re: [PolySix] Re: Noisy Polysix
2015-09-06 by Florian Anwander
... I doubt that this noise is induced by interference. It is clearly a single signal with increasing frequency counting up to 8 variation directly related to
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Re: [PolySix] Re: Noisy Polysix
2015-09-05 by Eoin O'Callaghan
The MIDI board is getting power from the top left of the back power board...as seen here. I haven t unravelled the red/black wires yet because its up stairs
Re: Noisy Polysix
2015-09-05 by synthmans@gmail.com
Yep, those are the midi jacks - as far as I read, this was EES s generic oem style product and ended up in a number of synth s and organs, with a bit of custom
Re: [PolySix] Re: Noisy Polysix
2015-09-05 by <backshall1@bellsouth.net>
Are those the midi jacks way over on the right hand wood panel at the end of the yellow wires? Considering they should be as close as possible and preferably
Re: Noisy Polysix
2015-09-05 by synthmans@gmail.com
The EES midi interface seems to have been a generic platform, perhaps with a bit of code customization for the related synth/organ etc. Otherwise, it s also
Re: Noisy Polysix
2015-09-05 by synthmans@gmail.com
Ground issues can be confusing, I figured the basic theory would be worth mentioning - again, more for the uninitiated... sometimes those ground lugs are also
Re: Noisy Polysix
2015-09-05 by synthmans@gmail.com
Seems they did quite a bit in their day with Midi interfaces etc. Apparently making the Unitor and AMT for Emagic... otherwise, very specific to the European
Re: [PolySix] Re: Noisy Polysix
2015-09-05 by florian anwander
Am 05.09.2015 um 20:24 schrieb Eoin O Callaghan cliofreak@yahoo.com ... If I remember the EES-Interface right, it was for the selection of the MIDI-Channel (I
Re: [PolySix] Re: Noisy Polysix
2015-09-05 by Eoin O'Callaghan
It seems to mute all On Saturday, September 5, 2015 7:22 PM, backshall1@bellsouth.net [PolySix] wrote: By the way, what is
Re: [PolySix] Re: Noisy Polysix
2015-09-05 by <backshall1@bellsouth.net>
By the way, what is that extra button above the pitch wheel for? From: backshall1@bellsouth.net Sent: Saturday, September 5, 2015 2:20 PM To:
Re: [PolySix] Re: Noisy Polysix
2015-09-05 by <backshall1@bellsouth.net>
The foil is already either acting like an antenna or creating a ground loop. Since the “real” ground is connected, it is probably a ground loop, so
Re: [PolySix] Re: Noisy Polysix
2015-09-05 by synthmans@gmail.com
Leaving the foil floating would turn it into a big antenna - radiating/coupling noise throughout the area, to every board... you have to review every wired
Re: [PolySix] Re: Noisy Polysix
2015-09-05 by <backshall1@bellsouth.net>
How about unscrewing the wire that is attached to the foil behind the chorus board? If the problem is too many grounds, maybe getting rid of one would help.
Re: Noisy Polysix
2015-09-05 by Eoin O'Callaghan
Trouble is, Im happy with the MIDI. Ive been tracking with it all morning and it works well. I just want to be able to create soft pads as well as loud fuzz. I
Re: Noisy Polysix
2015-09-05 by synthmans@gmail.com
True of course, but I can send a photo of my keyboard wiring for reference... as far as the interface, spread out the wiring and take some definitive
Re: [PolySix] Re: Noisy Polysix
2015-09-05 by Eoin O'Callaghan
Hey, yeah I lifted them off and had loads of separation. Moved the wires off the boards...moved the midi wires from any where near the analog board or
Re: [PolySix] Re: Noisy Polysix
2015-09-05 by <backshall1@bellsouth.net>
You’re still talking about unsoldering at least 32 wires and resoldering the black and white ones back to their correct location, then trying to explain to
Re: Noisy Polysix
2015-09-05 by synthmans@gmail.com
Hey, don t knock it... that interface is still useful and you can bet others would be willing to go for it on Ebay, as long as you document (photograph) it s
Re: Noisy Polysix
2015-09-05 by Eoin O'Callaghan
haha, well thats no good!
Re: Noisy Polysix
2015-09-05 by synthmans@gmail.com
Well I guess you d be lucky to track down any related info.... After more than 25 years successful experience we finish December 31, 2008 our business. With
Re: Noisy Polysix
2015-09-05 by synthmans@gmail.com
Here s the company that made your interface... EES in Germany, you might be able to get info from them via email (assuming you don t already have the
Re: Noisy Polysix
2015-09-05 by synthmans@gmail.com
That interface is purely for triggering the keyboard lines and doesn t offer any advantages, other than possibly for variations on Arpeggiator and whatever
Re: Noisy Polysix
2015-09-05 by synthmans@gmail.com
Curious what model that midi interface is... definitely Old School. Here s an example of a clean rewiring... a world of difference
Re: Noisy Polysix
2015-09-05 by synthmans@gmail.com
See if you can trace back the grounding, to ensure there s no loops/shorts etc. The Midi wires should not be put in the same run as the analog wires... that s
Re: [PolySix] Long time lurker but finally have a problem i have to post about.
2015-09-05 by <backshall1@bellsouth.net>
I would guess that you are fated to fix what you have. I’ve never heard of a pad repair kit and finding a replacement KLM-368 at a reasonable price is
Long time lurker but finally have a problem i have to post about.
2015-09-05 by ray.cardell@yahoo.com
So brief history. I have been recently into the synth repair world for under a year diy - modding- etc but collecting for ever. Friend calls me up with the
Re: [PolySix] Re: Noisy Polysix
2015-09-05 by <backshall1@bellsouth.net>
That sounds like a lot of work. “no cables are modified”? To put it back the way it was, you would need to unsolder all the black and white wires from the
Re: [PolySix] Re: Noisy Polysix
2015-09-05 by cliofreak@yahoo.com
So, Im trying to remove the MIDI setup to see if its causing the issue. Anyone know how the stock P6 should look. Ribbon cable etc?
Re: [PolySix] Re: Noisy Polysix
2015-09-05 by Eoin O'Callaghan
Hey, yeah I had no difficulty getting them out. I broke the glue before doing it a few days ago. Don t think there is an issue there. Ive been speaking to the
Re: [PolySix] Re: Noisy Polysix
2015-09-05 by synthmans@gmail.com
Did you carry out the instruction in Old Crow s Polysix repair website? It says to carefully break the glue (loctite) securing the connectors (see his post)
Re: Noisy Polysix
2015-09-05 by synthmans@gmail.com
Also, you can t leave bare exposed copper, you have to tin it.... How to tin a PCB without using expensive tinning solution | Stompville
Re: Noisy Polysix
2015-09-05 by synthmans@gmail.com
The area in question was the ground strip adjacent to the battery... everywhere else should be fine as is - you only want to work on affected/suspect
Re: Noisy Polysix
2015-09-05 by Eoin O'Callaghan
To be honest, i did go over the whole ground strip with a fiberglass pen, removing as much black as possible and leaving only the parts that look fine with the
Re: Noisy Polysix
2015-09-05 by synthmans@gmail.com
touching up that ground trace is not enough... you have to strip off the soldermask back to the good shiny copper, remove the bad section and add something
Re: [PolySix] Re: Noisy Polysix
2015-09-05 by Eoin O'Callaghan
Ive used the MIDI retrofit with a DAW as a controller and the MIDI all works fine but the noise doesn t change. Its still the same as using it via just the
Re: [PolySix] Re: Noisy Polysix
2015-09-04 by synthmans@gmail.com
Good point, you ve got extra circuitry there that could be injecting noise into the analog section. The midi interface ground wire connection should have been
[PolySix] Re: Noisy Polysix
2015-09-04 by Malte Rogacki
If I m reading the schematic right analog ground and digital ground are tied together at the power supply (and only there!). Another wild guess: The MIDI
Re: Noisy Polysix
2015-09-04 by cliofreak@yahoo.com
OK, a breakthrough of sorts...I thing this is a ground loop or something. When I touch the metal bracket for the keyboard onto the grounding plate that covers
Re: Noisy Polysix
2015-09-04 by synthmans@gmail.com
Yikes! A bit of a mess with the rewiring and the damaged tracks as a whole... likely you could have a number of vias/pads/tracks and such that need further
Re: [PolySix] Re: Noisy Polysix
2015-09-04 by Eoin O'Callaghan
Yeah its a MIDI mod and it works fine. Ill move the black and white wires now and see if it changes anything... On Friday, September 4, 2015 4:50 PM,
Re: [PolySix] Re: Noisy Polysix
2015-09-04 by <backshall1@bellsouth.net>
And why are the black and white keyboard wires still lying on top of the circuit board? Those are the ones that need to be kept away. From:
[PolySix] Re: Noisy Polysix
2015-09-04 by Malte Rogacki
Wait a second: What s that modification? Is that a MIDI interface?
Re: Noisy Polysix
2015-09-04 by cliofreak@yahoo.com
New video - Noisy p6 https://www.youtube.com/watch?v=wSc2PA44T_w&feature=youtu.be https://www.youtube.com/watch?v=wSc2PA44T_w&feature=youtu.be Noisy p6
Re: [PolySix] Re: Noisy Polysix
2015-09-04 by cliofreak@yahoo.com
CN03 has many different reading between the 7 different pins. I tried a few and got different results. Some gave 0k and a couple read around 20k. Between pins
Re: [PolySix] Re: Noisy Polysix
2015-09-04 by Eoin O'Callaghan
OK, so from scratch... Attenuator does indeed make it get louder and softer Moving the keybed away from the boards does indeed make it get a bit quieter. Its
Re: [PolySix] Re: Noisy Polysix
2015-09-04 by <backshall1@bellsouth.net>
And that’s IC 22 not 18. While you are in there, check for damage around the CN03 connector. Check for around 10K ohms between the pins on the connector. Don
Re: [PolySix] Re: Noisy Polysix
2015-09-04 by <backshall1@bellsouth.net>
Oh, that’s the 368, not 366. It’s the chorus board. From: mailto:PolySix@yahoogroups.com Sent: Friday, September 4, 2015 10:07 AM To:
Re: [PolySix] Re: Noisy Polysix
2015-09-04 by Malte Rogacki
Let s do this step by step. 1. Is the noise getting louder and quiter when moving the attenuator? 2. Is the noise getting louder and quiter when moving the
Re: [PolySix] Re: Noisy Polysix
2015-09-04 by Eoin O'Callaghan
Indeed, the one I was working on is IC22! NOT 18, sorry! On Friday, September 4, 2015 3:02 PM, backshall1@bellsouth.net [PolySix]
Re: [PolySix] Re: Noisy Polysix
2015-09-04 by Eoin O'Callaghan
Ive put it together again and its exactly the same. 367 chip 18 is fine. The chip I was working on is the one right beside the battery except on the next board