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Question for Roland JD-800 owners

Posted: Tue Dec 15, 2015 2:20 pm
by Tekhed66
Hi all

just wondering if anyone of you who own a JD800 have the self-editing gremlin and whether you have been able to find replacement slide potentiometers for the synth?

I've tried endless electronic part retailers and synth repairers and have drawn a big zero ... no one can suggest a new replacement part.

I've found an ebay listing for supposedly genuine sliders but at 10 Euro a go, that makes it wildly expensive (and there's no guarantee they're new and not just salvage from other keyboards).

anyone out there able to supply any info?

many thanks!

Re: Question for Roland JD-800 owners

Posted: Wed Dec 16, 2015 7:20 am
by Tekhed66

No one on this forum has had or uses a JD800???

Re: Question for Roland JD-800 owners

Posted: Wed Dec 16, 2015 4:31 pm
by pflosi
Couldn't find anything in the service manual about that part number...

On lots of synths, it helps to "blow" into the faders to get rid of some of the dust - good old "Nintendo cartridge fix". Alternatively, get some spray duster / canned air and try it with that. Do not vacuum equipment though!

Deoxit / contact cleaner could work too; or quickly wiggling the sliders up and down a couple of dozen times... But if it's actually dust, you're better of with dusting / spray dusters.

Re: Question for Roland JD-800 owners

Posted: Wed Dec 16, 2015 11:05 pm
by Tekhed66
Hi pflosi

I've had the synth professionally serviced and cleaned by a tech ... he re-soldered a few dodgy solder joins and cleaned the faders really well ... at least now it's playable whereas before, the synth would start self editing as soon as you turned it on.

He told me that the self-editing would probably always happen as the faders are pushing 25 years old and have had a bit of wear and tear... he tried to find replacement parts but he couldn't find anything close and just didn't have the time to keep looking.

I would never have thought finding replacement parts would be so hard... I've got theserial/part numbers of the faders but they seem an extinct species.

FWIW - I plan on getting the tech to do an annual clean ... he reconditions the faders with Deoxit F5 and it's made a huge difference. I bought a cover for it and keep it under wraps to keep the dust out ...

I suppose it just goes with the territory... old synths just need more TLC ... others complain of drifting oscillators and poor tuning so I'm just putting up with it.

If anyone else has a lead on where to get replacement faders, can you pls post to the forum and let us know?


Re: Question for Roland JD-800 owners

Posted: Thu Dec 17, 2015 6:59 pm
by synthRodriguez
I've spent countless hours scouring datasheets and sites for either these Panasonic EWA-type linear pots or their replacements.

AFAICT, replacements are simply unavailable. I found one guy that had some with a metal lever that I dismantled and reassembled to make a new pot for my volume control, but that's a specialty stereo pot anyway.

That said, I've never had a pot I couldn't get working 100% unless it had some sort of physical damage to it (spilled liquids, corrosion, uber-worn, etc.) and I've had several that required removal from the board and full disassembly to make them right; just using FaderLube wouldn't do it.

I took a unbelievably bad ghosting JD-800 and eventually got it working fine with no ghosting, but it was a lot of work and not something I'd want to do again.

Re: Question for Roland JD-800 owners

Posted: Sun Dec 20, 2015 12:48 pm
by Goa Travellers
I ordered a bunch of slide potentiometers from Roland Europe with central detent. I unmounted them carefully, flipped the bottom track, not to have the central detent anymore, remounted them, and then I replaced the defect potentiometers. Yes, for some of them, it helps to just clean them with air an add lubricant for potentiometers.