Repairing silicon rubber membrane contacts; Installation instructions

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Bob Weigel of www.sounddoctor... documents his contact repair invention. (for more details and a .pdf that gives better visuals on the details, go to sounddoctorin.c... ) A material created for NASA is backed with 3M adhesive and cut into disks the size of typical Panasonic, Fatar, Roland and casio contacts (or close enough to work :-). ) Other companies have offered paint which often doesn't work and then you have a bunch of paint with a rough surface stuck to your contact. Not to mention it goes bad in 72 hours and you're out 40 bucks or so. These disks have a great look and I'm sure probably a long shelf life under normal conditions. So you can keep them ready to go and just use them as needed. We can cut the material to do the concentric ring contacts found in K1000 series Kurzweils, Kawai K1, K1II, K3 and K4, Akai AX80, Fender Chroma Polaris and SCI Multi-Trak I believe also. But so far these seem to clean up every time I deal with them. So we have some spares. However I've run into several Polysix's that simply would not clean up. And some Fatar types in Peavey DPM3 as I recall. So these should work in Korg Polysix, Poly61, Poly61M, DW6000, Peavey DPM2, DPM3, DPM3SE, DPM SI, Kurzweil K2000, Roland JUNO-6, JUNO-60, JUNO-106, Alpha JUNO-1, Alpha JUNO-2, JX-3P, JX-8P, JX-10, D5, D10, D20, D50, D70, U20, Rhodes 660, 760, MK60, MK60 and the other RD series keyboards and a host of others. Moog Memorymoog, Oberheim OB-8, Matrix 12 I believe and many others. Seiko DS series keyboards I believe also. FURTHERMORE these work GREAT repairing buttons that press against contact traces on circuit boards (Siel DK80 for example which I did the other day. DK series use spring contacts I believe though on all of them.)
NOTE: These work great for other things. Here's a note from Vince Ferragamo who used these on the remote for his '84 Buick:
W O W did they work great. It took me about 5 minutes to place those pads in the remote Their size was exact perfect. In fact it took me more time to walk out to the Buick. Worked perfect. Maybe you should make a video " re-do auto remotes." If you don't make a video just mention it in one of your other videos. You can't buy a new remote for a 94 Buick. You made my day.
Thanks again
Vince

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7 сен 2024

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Комментарии : 83

@Sjobeck7 14 лет назад

Sounds like a great solution Bob for all of us Vintage Synth fans with recurring key contact problems. You are the man!

@slippast 13 лет назад

After replacing the battery I meticulously cleaned my new Polysix's contacts and less than 48 hours later things were already going south again. I'm excited to give your solution a try. I just placed my order. Thanks Bob!

@slippast 12 лет назад

Hi Bob, I used your contact kit on my PolySix and haven't had a problem in the year and a half since. For the record I cut up the leftover sheets into tiny bits and used them to redo the key contacts on an Alesis MMT-8 and HR-16. Both are notorious for contact problems, you should add those to the list of gear that your kit will fix - a lot of people would be interested. Thanks again!

@kiyoshi67 14 лет назад

Thank you so much Bob, your kit help me replace all of the contacts on my Roland Juno-D, and now it works like new again. Took a few hours, and I did lose a couple discs, but once I got the hang of it things were smooth. I played a show the night I did the replacement, and it went perfect. Thanks again!

@stormyandcold 12 лет назад

Thanks Bob, I purchased 2 packs of the Nasa pads for my Juno D and redid all the keys (122 contacts) works great and like new now. Recommended product A+++

@Ripprock1 13 лет назад

Bob you are the wizard.Thank You.I will have to invest in your product. Feel I owe you for relieving me of so much anxiety and frustration over the last two years.Have a Triton LE that everyone that comes into my studio wants to have something from it on thier recordings.For two years I have literally played around the middle "A".Watched your vid and got the nerve to go inside and do it myself.Luckily there was just a speck of something on one of the contacts.

@sounddoctorin 13 лет назад

@Ripprock1 That is often the case on the newer stuff. The contact disks I developed are very useful for the older ones of for occasional newer ones where someone spills something that ruins the conductive properties of a contact etc. Glad you worked it out on that one!

@tricko2286 8 лет назад

Robert - thanks a million for this - you are a great resource.

@Arthur60 14 лет назад

Thank you very much Bob for this detailed repairing techniques. I've been asked for this, gone link your video and website!

@sounddoctorin 13 лет назад

@Ni5ei That's great to hear! Probably because on this particular keyboard Roland has had a lot of problems. (like I say if under warranty just get it replaced!!) I deal mostly in 'no longer in stock' items of that nature where it's part of a scrap out of what sometimes would be an otherwise ok but cosmetically ganked unit or something. So to make it play out I have to charge more like 10 bucks a strip or so depending on length. I usually figure 1.50 per contact on vintage ones.

@sounddoctorin 12 лет назад

Great to hear! Yeah I'm not going to do more than just say it 'works on every silicon rubber membrane type contact'. THere are 100's of machines out there and remote controls that fall into this category :-). It's be an all consuming thing to list them all. hehe. But thanks for the testimonial on that one! I used to own an MMT-8. My first sequencer. I ran into a glitch on the earlier OS where I edited a sysex message and accidentally went past the end of the message. Destroyed all data.

@sounddoctorin 12 лет назад

I've seen cases where near every contact is fouled so it's certainly possible. What you need to do is 1) open the keyboard up being careful not to touch anything in the power supply ac/inlet area of course when it's plugged in and unplug it to set this all up 2) On these you have to get it where you can remove keys in a section so you can get the rubber cups so you can pull up one at least. 3) use foil etc. to short a contact with it on and see if the key sounds then. If not it's not contacts

@Ni5ei 13 лет назад

@souddoctorin Thanks for the replies. Don't get me wrong, I'm really happy I came across this video and your method is great! If I ever need to restore a vintage keyboard with these rubber switches I will immediately order from you. But I'm repairing a Juno D at the moment and got a reply from Roland today about the strips. Roland usually charge very reasonable prices for spare parts and the 5 strips needed for the Juno D cost me €15.95 (less than $22) including shipping.

@sounddoctorin 6 лет назад

I worked over a poly61 the other day that had a TERRIBLE issue initially. IT went from a few keys not working/ working intermittently to like 12 working ok when I installed contact disks. I saw the first few could be made to work well by putting a little spacing as I've seen but then it got ridiculous where I was having to put too much and so I went with the other thing we do on gold contacts and got some GREAT DATA THIS TIME! I'd just never seen one with that many bad! So 1500 grit sandpaper..about 10 swirls on each contact. Perfect. So apparently what is happening is, the carbonized original silicon rubber surface plates out something invisible that doesn't easily wipe off and it's dissimilar in some way to the nasa contact material! Glad to finally confirm this with like 40 some problem keys that all worked like new with 10 swirls with the super fine paper. A few less with 1200 probably but I wouldn't go any coarser than that.

@sounddoctorin 14 лет назад

@Arthur60 Thanks, I put up a link to this on the website instructions now. Blessings, -Bob

@augustohernandez3628 12 лет назад

hi , thanks for this video, very good video

@sounddoctorin 12 лет назад

*YOUR* keys did :-) I've done the same thing and it worked on some units. If you read my documentation you'll see that I began to find units that this would no longer work on. Furthermore some that I did that to failed again. Basically I think the carbon just eventually gets beaten out of them. Roland's pads I think and Kawai's and the Korg DS8 and some others used a deeper mix of carbon or something. Because I can always clean those with acetone ...continuing...

@sounddoctorin 12 лет назад

We ship anywhere of course. I just plastic sleeve the contact sheets and put them in a standard envelope and assuming nobody drops a meat tenderizer on it between here and there .. :-) so far so good! 26.00 for 75 contacts including ship is what we've been doing.qty discounts available.

@sounddoctorin 12 лет назад

@quint9000 Hi Quint, yeah that's way out of bounds. Exactly. Moreover if the surfaces measure over 700 ohms or so you won't usually get CONSISTENT performance due to the non-ideal nature of things at the interface there. In practice if you are getting 2000 ohms laying probes on the surface the contact is useless except as a button to increment or something. There will usually be at least a delayed response or sporadic contact.

@sounddoctorin 14 лет назад

@kiyoshi67 Excellent to hear! Let me know if any problems ever arise. From what I've seen over the year or so we've been testing these no issues and it just looks like more stable stuff than the original so hopefully it's good for a long long time!

@sounddoctorin 12 лет назад

@danielortizdecaracas Rather just go to the sounddoctorin site listed in the info and look at the .pdf. it's a lot better really.

@sounddoctorin 13 лет назад

@Ni5ei I have no idea what Roland charges per contact strip... those are 12 and 13 space. I looked up btw and there IS A SERVICE NOTE on this. To the ORIGINAL OWNER (proven by slips) they WILL upgrade the keyboard to an improved design! Good to know! See a service center near you and get that done if you are an original owner. If NOT they claim it's usually a dust issue so just following my cleaning instructions on the general synth tips on my sounddoctorin site.

@danielortizdecaracas 12 лет назад

thanks a lot, please repeat all procedure video, but taking to close captiions zoom in in your aproach of this materials and zoom in in cuts parts

@sounddoctorin 13 лет назад

@Ni5ei PS I imagine they charge at least 5 a piece but probably more like 10? So it'd be maybe about the same I don't know. Whatever the case my contacts are likely better than original material at least so no great loss for people who have done it already.

@sounddoctorin 11 лет назад

ps er..actually the direct link is right in there if you just hit 'more info' under the video..

@sounddoctorin 12 лет назад

Anyway acetone does about what the file does but it keeps it flatter. I tried filing too. That's one method I entirely disregarded because often it's hard to keep the contact flat and it's slower. Anyway the older panasonic like PS6 etc. tend to get the carbon beaten out of them and then it's such a thin layer that it actually gets worse eventually instead of better with those methods. When I developed these though I just stopped doing all that stuff because time is too valuable.

@sounddoctorin 11 лет назад

If you look at the more info it should have my web page. global synth link there and 'parts' then 'keyboard' and you'll see the 'good news' links on the keyboards that have that issue

@sounddoctorin 13 лет назад

@casioPX500L Hi, The only issue I've seen with those thus far is people dropping them on their back or top and some of the pieces getting knocked out of place. You have to pull the bottom as i recall and you can pop the pieces back into their resting hinge location. That's the only issue I've seen thus far on those and I don't have one here to do a video on it.

@RememberToLove 9 лет назад

hello, I have two Casio keyboards wk-1800 & wk 1630. Both have the same issue, 8 keys in the upper register only play once. They only play if the touch sensitivity is turned off, but they only play once and then will not play again until the keyboard is turned off & on. On the screen, it shows that they these notes are still being played/ sustained, that is why you can not play them again. I have already opened up the keyboard, vacuumed up all dust & debris in and around keys & wiped down the circuit board. I have also tried switching the pads from other working keys to see if the pads need to be replaced, but unfortunately the problem still exists. I haven't been able to find someone who can fix the keyboard on the island where I live. If you can give me any direction toward fixing the problem, I would most appreciate it. thanks & kind regards.

@HardlineFeminists 7 лет назад

jAckie messenger What island would that be hon?

@Mikexception 10 лет назад

To: "Casio PX500L" Anybody asking about knocking noise of hammer action keys may see how I managed this and other problems in my clip "D.I.Y. What's inside CME UF-8 MIDI"

@jasoncorganbrown 12 лет назад

Hi, thanks for this informative video. I have a JX3P with a single key that does not sound - I am able to trigger it via midi so I'm confident its the contact or perhaps an issue with the trace. Does it sound like your contact repair solution will work for this?

@fachaa331 12 лет назад

hello I have a korg wanted to consult m1 that lights but is labeled and discovered that if I disconnect one or two chips that go to the board of the keys no longer works is labeled everything but my question is that keys can be wrong

@quint9000 12 лет назад

I had an OB8 in for calibration. None of the keys worked. The customer doesn't care because he midis it. You can't calibrate it unless the first octave of keys work. I ohmed out the contacts and found they were ranging from 15k to 100k each. With my decade box I found that if you get above 5k you can't trigger a note. No amount of cleaning will fix these contacts. I'm going to try your solution. Quint

@CamdenMusicFrance 12 лет назад

Hi, a bit off topic, I sent you a mail a few days ago about some ELKA MK88 replacement keys, do you still have those or do you know where I could get some? Thanks!

@3GreeneBJ 8 лет назад

Very useful video. These carbon contacts are all very well, cheap and functional BUT they don't have the longest ever life. I've tried the cleaning and the soft 4B pencil lead solutions which while they work, generally don't last. There has to be a better way and it looks like you have found it. How do I obtain some of that NASA stuff here in the UK? Reading down I perceive a reluctance in you to post out to we people of the UK. Yet, I at least, surely am your brother - even though some of us these days may not be! I keep wondering if I could do a better job here if I could make use of some sort of sticky pad the other side of which I could use impregnate. cover with the carbon pencil. That seems to mean paper don't you agree? Anyway thanks for the instructional. Rgds, Berry

@sounddoctorin 8 лет назад

+Beresfordjohn Greene You can just click the link up in the description there. No I send to UK all of the time. Now we have cheaper ways of getting e-delcon there at least. 7.00 ship on that method extra. However the price I list on the site includes regular 1.15 stamp international OR US. It saves me time to just stick them in a regular mailing envelope as LONG as people will TAKE RESPONSIBILITY if it gets lost. ie. it's your 1 in 100000 odds risk. Not mine because I offer the 7.00 option that insures some kind of tracking. As long as you understand that it's your risk I just send them out and only Jack Valentijn (who also tried to fish my source on the material so he could obviously sell them himself. lol) complained of the last of 3 envelopes not getting there...then tried to chargeback the entire order on me! What a dork. Anyway that's the scoop.

@Ni5ei 13 лет назад

@kiyoshi67 The Juno D has 122 contacts. Did you replace them all? That would cost 2x $26= $52. The original spares are still available and probably cheaper?

@danielortizdecaracas 12 лет назад

hi mr thanks a lot for you video, this method is valid for kawai k11?

@bensellersaudio 9 месяцев назад

So you just put it directly on the old contact correct?

@realityfakers 14 лет назад

Do you ship those pads to the U.K? I have a polysix and would prefer to try these simple pads before I go the whole hog and custom fit my yamaha type metal contacts in place of the original (got this working in prototype but original is best of course for re-sale)

@sounddoctorin 12 лет назад

@danielortizdecaracas I assume it has the rubber contacts. I'm not SURE if they are concentric ring or not though. Some Kawai's were. If so you'd have to cut your own 'ring' part. You could sharpen the ends of tubing to make a cutter or something and do it probably but GENERALLY those clean up so I've had no reason to try yet.

@realityfakers 14 лет назад

@sounddoctorin hmm so I take it that means you don't like shipping to the U.K anymore then? (trying to work your reply out). Anyway we are not all shady characters in the U.K, I've bought plenty of synth parts from the US (Blue LCD for sy77 etc) and always accept slower postage. I guess it's time to get the soldering iron out and do the yammy thing (quite long winded as it requires a lot of custom wiring/rejigging) but I guess it will be pretty much 100% reliable when done. :) thanks

@sounddoctorin 12 лет назад

All paints pretty much don't interest me *except* in cases where you have to repair traces anymore. For contacts..anywhere you can get a flat surface to stick these on they are just way more reliable *and* economical since they are quicker to apply in general with a flat reliable finished product...and of course they don't have a shelf life that is known anyway. I"ve used the Caikote for repair traces where drinks were spilled in a Kawai midi-grand that was used on lake Conroe,TX. Still ok ?

@greenrumour 3 года назад

Any keys for a Kawai k3 need ABCD might be able to fix chipped A and B but C and D are snapped off. Thanks

@sounddoctorin 3 года назад

just get me via e-mail off sounddoctorin site

@sounddoctorin 14 лет назад

@chizmo7 Hi Matthew...that's the standard code for initiating an email on most systems. I should add that though since probably more people are just using ones that aren't integrated that way. Go to sounddoctorin page and just click the address link (that way spam harvesters won't find this post :-)

@cultofcoin 4 года назад

What could I do about a Roland JD XI play button that I have to press down really hard, and is starting to not work? It's a rubber/plastic button that doesn't click, but it pushes down? I want to fix it myself, but I never took my drum machines or synths to get fixed, but I have to get three of them worked on? Anyone know where I could go or how to find out how to do this kind of stuff? Any advice will help?

@sounddoctorin 4 года назад

If it is you must pull it apart/clean w/q-tip and alcohol or if that doesn't do it use my stick on contact disks

@yukicanchibi 4 года назад

Do you think your caps size matches a 3 levels sensitivity keys of a kawai ?

@sounddoctorin 4 года назад

not sure.... they're ~3.8mm diameter

@shapeshifter8986 5 лет назад

I sanded the contacts of my polysix a bit and it works again. How long does that last?

@sounddoctorin 5 лет назад

there are many variables. Sometime you trim surface and they get way worse; indicating only a thin surface w/ high carbon I suppose. Other less common times it works...maybe a long while. 20 years? Hard to know. Depends on how good they were made that day.

@paulgrooveside2803 Год назад

Bob, do you still sell these contact repair strips? And did you make the concentric ring contacts for the Chroma Polaris too?

@sounddoctorin Год назад

yes but there's no shortage of polaris used but good strips

@paulgrooveside2803 Год назад

@@sounddoctorin thanks! How many of each type of strip does a Polaris need, please? Do you know of a good source of them?

@sounddoctorin Год назад

call me at # on my site@@paulgrooveside2803

@gianmilesbatoon60 3 года назад

I need that on my kawaii k11

@3GreeneBJ 8 лет назад

May I just say one thing here? In your other instructions I read that you have suffered from "tarnished," or some other reason, gold contacts that won't conduct. May I most respectfully advise the use (after cleaning with alcohol) the use of a pencil eraser to remove the last traces of whatever is the residue. Never abrade gold contacts as tempting as it might seem.

@sounddoctorin 8 лет назад

+Beresfordjohn Greene 1500 grit that I recommend is very functionally similar as long as you don't launch out on a sanding session. I said just lightly do it. If eraser works though for you that's great too. Try that first definitely.

@filibert9077 10 лет назад

where did you buy these carbon contacts i will be interested to buy someone for repair keypads thanks

@sounddoctorin 9 лет назад

You can always just read the 'more info' above and it shows the link to my sounddoctorin.com site where there's a global synth resource link. Then parts...then keyboard... then all the key types that use the contact disks have links for the descriptions/instructions. Sorry I didn't see this sooner. I don't get notifications for some reason.

@sounddoctorin 7 лет назад

Hey Eddy, it says you commented 3 years ago but my notification just said you commented hours ago. hehe. not sure what's up there but my comment below still applies. The disk material is available as noted in the details above by emailing me at sounddoctorin@gmail.com

@mbmsv 10 лет назад

What's the diameter of a single contact disk? Thanks.

@sounddoctorin 9 лет назад

about 4mm...

@sounddoctorin 11 лет назад

I missed this somehow. Not the place to hold a conversation with me obviously. Try the email approach on the contact link on sounddoctorin website. I'm not aware of having keys for MK88. Send me a photo

@jamesramsey2419 8 лет назад

I have a Studio Logic SL880. (Fatar) Would your membranes fix it? also, do you have any video of how to remove the keys?

@sounddoctorin 8 лет назад

Probably. I'm not sure if that particular unit uses ones I have. Get on my email from the link in the description and the 'contact' link therein and send me a photo and precise length and that should remove all doubt

@junkification 11 лет назад

You mean somebody stole $267.00 worth of that key contact repair material? Who was it? If you can, let me know, I can spread the word to help people avoid this person.

@skyprop 8 лет назад

:36 : how did that sound effect go?

@sounddoctorin 8 лет назад

+skyprop ask any gopher you happen to meet

@skyprop 8 лет назад

+sounddoctorin LOL I'll Try!!!! maybe a Groundhog!

@skyprop 8 лет назад

6:07: my guess is a chassis warp or bend or keybed bend or warp

@skyprop 8 лет назад

+skyprop Check for level and squareness.

@sounddoctorin 8 лет назад

+skyprop I've seen this with quite a few units now...Sequential and Korg and others. Panasonic somehow produced these things to where they are within just thousandths of an inch of not touching. THe original material while inferior to my disks in long term stability, were superior in initial contact. You have to press the disks ever so slightly more. So just space them to where they are hitting but at least 40 thousandths probably is a good rule of thumb.

@chizmo7 14 лет назад

Hi, I'm interested in purchasing this repair kit for my OB8. I went to your site and when I click on "email", it assumes I have some sort of windows email connection and gives me some pop up instead of your email address. I need your email address. Thanks, Matthew.

@sounddoctorin 11 лет назад

I'm thinking I should move my vids from youtube. I'm getting accused of harassing when someone STOLE 267.00 of THIS material from me. Is stating facts and WARNING OTHERS not to get solen from 'harassing'? RU-vid is dumb. THere is no accountability

@sounddoctorin 12 лет назад

Please stop posting this to random videos or I'll have to block you. Why can't I find a way to email you?

@sounddoctorin 14 лет назад

@realityfakers Hhee.. no no I've had great luck overall with people in UK. Just warning you about this one rip off artist. And since paypal has I find an immoral code of conduct I'm not using them on any more non-tracked packages. So people can either pay the crazy price, visit him and get him to pay for his order that I'm sure is setting on his MS20 and JP4 by now, OR I can get google checkout working...OR they can send money orders.