I'm looking for the rubber boot key contacts for a Roland RD300s. Roland doesn't make them any more. I cannabalized the highest octave a few years ago to fix the ones in the middle octave but now they're breaking as well.
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One of the lines in the keyboard scanner has opened up. I have an idea what it might be and it is a nasty problem involving circuit traces that are silver conductive paint on a plastic insulating base that separate from a jumper at each end of the strip that the key contacts are made by conductive rubber pills pressed down by the keys. The contact of the flexible circuit under the keys to the jumper cable can be broken by vibration. I have an EPS7 with the problem and other than replacing the whole contact strip under the keys it really has no easy solution.You should probably have a Roland shop look at this problem. If your unit has this same arrangement it is repairable only by replacing the whole key contact strip.
The key contacts have become contaminated. Disaasemble and find the contacts under silicone rubber domes. They are typically black conductive rubber pills, two per key. Clean them and the circuit traces they press against under them with ONLY 99% isoprophyl alcohol and Q Tips GENTLY. Then reassemble and test operation.
The key contacts need to be cleaned. They are usually conductive rubber pills in silicone domes that get pressed onto circuitboard traces by the keys. Disassemble to get at the contacts. clean ONLY with 99% isoprophyl alocohol and Q tips. Clean both the pills AND the circuit traces they contact.
Be very careful of cables when opening the unit. Document where all the screws go and their length and threads.
Answer: Before i give you the right solution, i have to say that i have posted the answer to FIX the problem of all of the contact problems, people writing in how many of their keys are not working. And the post that they are showing is one that says to clean the contacts. That will not work. Ok, the answer..... You can purchase a kit called Rubber contact kit here: http://www.mcmelectronics.com/product/20-3890&cid=prodCrossSell or Key contact Kit: http://www.oaktreeent.com/Roland_Keyboard_Parts_Units.htm
These kit are made to re-coat the contacts on the keys. It will bring your board back to brand new condition and last as long if not longer than the original coating. Also can be used for any rubber contacts like remotes or game controllers. etc. This will work and i did mine after numerous times of taking the keys off and cleaning them. I hope this gets out to all of you that are having the same problem. Good luck
Roland FP is a nice keyboard but has a known problem on cracking key weights. There is a counter weight under each key to push the key upward. There are two sizes of weight beams, longer one for white keys and shorter one for black keys. Roland did not make the original weight beams strong enough to last. They will crack and eventually break. When it happens, the key will stay down. Fortunately, they can be easily replaced.
Roland FP-8 has 4 black screws at the bottom on each side end. Remove the screws, flip the ends up and expose the interior. Near the hinge of the problematic key, carefully ply open the hinge tabs and remove the key from the hinge. You will find a weight beam under the key. Remove and inspect the weight. There should be a metal wrapped in a plastic beam. If the metal part is missing, find the missing part and replace with a new beam. You can order weight beams from Roland. It costs about $10 each plus shipping. Put everything back in the reversed order.
The contacts of most of these use a conductive rubber pill that is pressed against circuit traces with a hard black conductive coating.
These probably need cleaning. One has to disassemble the key switch area and clean both the silicone rubber "pills" and the traces where they contact. Carefully use 91 or 99% isoprophyl alcohol and a Q-Tip to clean these. The black pills are under silicone rubber dome things..
While you have it apart clean ALL of the contacts! You may find a lot of screws to remove. Use a little segmented plastic tray to keep the screws in order and OBSERVE the lengths of each... sometimes they vary and you want to get the correct ones back in the same places.
You may need to clean the contacts which are usually conductive rubber. I explained stuff for another Roland problem with two keys that were intermittent. I have an EP-7 that I had to do the cleaning of the key contacts. Use 91 or 99 % Isoprophyl alcohol to clean BOTH the conductive "pill" (Black under silicone rubber domes) AND the traces on the board where they press. Clean gently as the traces have a hard black coating.