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Replace main encoder?

 
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Panason
Junior Member


Joined: 13 Mar 2011
Posts: 74

PostPosted: Mon Oct 09, 2017 2:00 pm    Post subject: Replace main encoder? Reply with quote

Hi all,
The big white data encoder on my Radias is playing up. I have to turn it slowly to get values to change up/down smoothly. If i try to turn it fast to scroll through presets quickly, the values jump up/ down and i don't get anywhere.

is it time to replace the encoder and if so how feasible is it? will I need to use soldering?

Thanks in advance
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LiPI
Junior Member


Joined: 17 Feb 2010
Posts: 74
Location: Hungary

PostPosted: Tue Oct 10, 2017 6:26 am    Post subject: Re: Replace main encoder? Reply with quote

Panason wrote:
Hi all,
The big white data encoder on my Radias is playing up. I have to turn it slowly to get values to change up/down smoothly. If i try to turn it fast to scroll through presets quickly, the values jump up/ down and i don't get anywhere.

is it time to replace the encoder and if so how feasible is it? will I need to use soldering?

Thanks in advance


Hi!
Yes, you have to replace the encoder. I did it a few months ago, it was hard to solder out becouse it's soldered on both sides of the main board. If you don't have experiences about soldering ask somebody who has.
The good news, there is encoders on the market:
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR0.TRC0.H0.Xencoder+radias.TRS0&_nkw=encoder+radias&_sacat=0

Best regards!
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Now: KORG RADIAS-R, EDIROL PCR-800, YAMAHA MOX6, Behringer DSP2024, ROLAND MC-808
Past: KORG Poly800, i5M, TR, R3, AKAI SG01v, ALESIS micron, ALESIS Fusion, Waldorf Blofeld, TERRATEC AREA 61

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Panason
Junior Member


Joined: 13 Mar 2011
Posts: 74

PostPosted: Sat Nov 04, 2017 2:41 am    Post subject: Reply with quote

Thanks, how difficult is it to access the contact points for removing the old one and replacing it?
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voip
Platinum Member


Joined: 27 Nov 2014
Posts: 1167

PostPosted: Sat Nov 04, 2017 11:15 am    Post subject: Reply with quote

Close to a complete teardown is required to get at both sides of the printed circuit board carrying the encoder.

.
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Panason
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Joined: 13 Mar 2011
Posts: 74

PostPosted: Sat Nov 04, 2017 12:13 pm    Post subject: Reply with quote

Thanks folks. So i guess I have to pull out all the other knobs to open up the Radias ?
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voip
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Joined: 27 Nov 2014
Posts: 1167

PostPosted: Sat Nov 04, 2017 1:03 pm    Post subject: Reply with quote

Pulling the 39 black knobs off, plus the encoder knob, is just the start of it.

.
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LiPI
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Joined: 17 Feb 2010
Posts: 74
Location: Hungary

PostPosted: Mon Nov 06, 2017 7:18 am    Post subject: Reply with quote

Here is a good start to disassambly the RADIAS:
http://www.korgforums.com/forum/phpBB2/viewtopic.php?t=43766

You have to get out the panels like this for soldering the main encoder:

https://db.tt/gYSPoMLEWE
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Now: KORG RADIAS-R, EDIROL PCR-800, YAMAHA MOX6, Behringer DSP2024, ROLAND MC-808
Past: KORG Poly800, i5M, TR, R3, AKAI SG01v, ALESIS micron, ALESIS Fusion, Waldorf Blofeld, TERRATEC AREA 61

Music: http://lipi.bandcamp.com
Patches, "goodies": http://lipi.atw.hu
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iowagold
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Joined: 11 Nov 2013
Posts: 166
Location: in an alternate time line

PostPosted: Mon Nov 06, 2017 3:37 pm    Post subject: solder sucker iron and chem wick Reply with quote

I use an iron like this one



https://www.ebay.com/itm/ELECTRIC-HEAT-POWER-HEATED-SOLDER-SUCKER-PUMP-DESOLDERING-IRON-TOOL-40-WATTS/141671166475?

it is a solder sucker iron built as one unit and is manual on the suck.

watch the heat on the board...
you can burn the board and lift the trace right off..

also there is a good product called solder wick or Chemtronics 10-25L 25' Solder Wic Wick Braid For Solder Removal from Circuits
https://www.ebay.com/itm/Chemtronics-10-25L-25-Solder-Wic-Wick-Braid-For-Solder-Removal-from-Circuits/171472100589?

I have both here in the computer repair lab.

just take your time.
re tin or reflow with fresh solder before trying the removal with 60/40 rosin core. kester brand is the best and use the super thin 30 gauge stuff
if you are good with small delicate things you will have good luck.
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voip
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Joined: 27 Nov 2014
Posts: 1167

PostPosted: Mon Nov 06, 2017 9:07 pm    Post subject: Reply with quote

Many thanks to LiPI for the useful info. Looking at the image in the Dropbox link, and the previous forum discussion, it would appear that the knobs don't have to come off for the teardown. The Service Manual stackup diagram has no disassembly instructions and gives the impression that the knobs have to come off in order to remove the front panel.

.
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LiPI
Junior Member


Joined: 17 Feb 2010
Posts: 74
Location: Hungary

PostPosted: Thu Nov 09, 2017 12:26 pm    Post subject: Reply with quote

Your welcome voip!

But as I mentioned above to you Panason, if you don't have enogh experience about soldering in both sided boards, you should ask some one to do it instead of you!

The replacing of the encoder is not easy like a resistor...

Get off the back of the RADIAS, then from layer to layer the panels.
It's not to complicated or hard work, but the soldering is dangerous for the printed circuits if you not enogh quick. You can burn out them very easily.

Only one knob have to remove by the front panel, the main encoder knob. Just pull. The others are as you can seen on my photo not necessary to remove.
The is more photos here: https://db.tt/9e10Q372x6

Any way I used an solderer like this: https://tomnerszerszam.hu/spd/TRP_2-73/PILLANAT-FORRASZTO-PAKA-LIDOKOV-220V-75W since I was a child. And of course a tool; it's essential: https://tomnerszerszam.hu/spd/10212/ONSZIPPANTO
_________________
Now: KORG RADIAS-R, EDIROL PCR-800, YAMAHA MOX6, Behringer DSP2024, ROLAND MC-808
Past: KORG Poly800, i5M, TR, R3, AKAI SG01v, ALESIS micron, ALESIS Fusion, Waldorf Blofeld, TERRATEC AREA 61

Music: http://lipi.bandcamp.com
Patches, "goodies": http://lipi.atw.hu
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Kossi



Joined: 05 Jul 2006
Posts: 44
Location: Germany

PostPosted: Tue Dec 05, 2017 9:39 am    Post subject: Reply with quote

I was able to get the wheel fully working again on both my Radias and my microX by washing the encoders with Fader8/AID 8Clean in assembled state, knocking on wood as I had bad experiences with other contact cleaners on other synths before and replaced the encoders in the end.

No more skipping or jumping for more than a year now.

Won't fix a complete worn out encoder, but worth a try (especially taking the effort to disassemble the Radias unit into consideration).
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Panason
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Joined: 13 Mar 2011
Posts: 74

PostPosted: Wed Dec 13, 2017 8:57 pm    Post subject: Reply with quote

Thank you very much for the info, you guys are awesome. I 'll try a contact cleaner first Smile
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Panason
Junior Member


Joined: 13 Mar 2011
Posts: 74

PostPosted: Fri Dec 15, 2017 2:27 pm    Post subject: Reply with quote

Good news! I used Servisol Super 10 contact cleaner spray (available on Amazon) and it did the trick!

First I sprayed some compressed air into the encoder, turned it around for a while, then a couple of sprays of the Servisol, and more turning. Working fine now Dancing
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