How to clean contacts main keyboard - Yamaha Music

Hi
If you are talking about cleaning the rubber contacts I wouldn't bother. Once they start to fail then it is best to replace them. You can do this either for the octave giving problems or best to replace complete set. Main part is VY84670R your piano has 6 octaves of these. with a shorter part at either end.

It's most likely to be dirty key contacts.
The contacts are conductive pads. They get "crud" on them over time, which then just needs to be cleaned in a certain manner.
Best to clean all the pads over the entire keyboard. It's not difficult for someone with experience, but it's not a job for a novice.
My guess is that the keys are toward the center of the keyboard.

Dead keys on Yamaha PSR e413 keyboard: Flip keyboard upside down, remove cover screws (use marked cardboard template to remember where they came out), spray suspect key-contacts with fast-drying contact cleaner, (usually a PCB with a matrix of contacts under keys), re-assemble base cover, wiggle faulty keys as far as possible to 'scrub' any dirt or oxidization. If this cleaning trick doesn't work, get a pro to check it.

When PSR550 keys stop working, or are intermittent, in any arrangement, this can be fixed (with work). There is probably TINY dust or debris which prevents a clean key contact from taking place; you must unscrew and open the PSR550 up like a ****, then unfasten the bottoms of the keyboard circuit boards. You can figure out how to move them without totally disconnecting them. You will observe how a tiny rubber-mounted contact presses against an interleaved circuit-board connection pattern to make contact when a keyboard key is pressed. Any dirt or crud on the contact area of the circuit board must be removed, because it will prevent the conductive contact from bridging the circuit cleanly and fully. I used 91% alcohol and QTips to clean all contact surfaces. It took me a couple of disassemble/assemble cycles to get all the keys clean and working, and the PSR550 back together. But first download the service manual: it will show you how to open it and access various components. You will see that the keyboard switches are much like calculator buttons on a TI-83 calculator. They are pretty well enclosed, but you will see how much dust can settle in just through various humidity conditions, especially if you take it to gigs. Good Luck.

One of the two contacts of that key is dirty. This cause the key velocity to be read as maximum making it loud. The keyboard contacts are conductive rubber pills that press across circuit traces on a board under the keys. CLean the pills and the traces GENTLY with ONLY 99% isoprophyl alcohol and Q tips. Getting at the contacts requires a lot of careful disassembly of the keyboard to get at the contacts.

you can carefully take the keyboard apart, and remove the keyboard, remove the attached circuait board (if applicable). then remove the rubber contact strip to access the contacts themselves. each key has an indivudual contact underneath it. the contact strip and contacts can be carefully cleaned with a pencil eraser tip dipped in rubbing alcohol, using seperate eraser tips for the contact strip and the contacts themselves, and changing out more eraser tips when they get dirty, if necesarry.

here is directions for cleaning contacts, it is for older model korgs, but the procedure should be fairly similar.

http://www.oldcrows.net/~oldcrow/synth/korg/polysix/keyclean2.html

Clean or replace the rubber contact pads.

The key contacts proabably need to be cleaned.

One has to disassemble the unit being very careful of cables. Do not force anything.

The contacts are usually black conductive rubber "pills" under silicone rubber domes. These are often in strips covering several key contacts.

Clean both the pills and the circuit traces on the board they contact with 99% isorophyl alcohol and Q-Tips.

You probably need to clean the contacts underneath those keys that are not sounding, otherwise check the components (diodes, resistors, etc..?) that are connected to those contacts , also check the wires and/or the connector that goes from the contact plate to the main board, see if there are broken wires and resolder, check if the connector pins are dirty or badly soldered and clean/resolder if necessary.

if all of the above fails then It is not a bad thing to check other connectors too, also any ICs that are plugged into sockets as there may be some oxydation so cleaning the connectors and unplugging and reinstalling the ICs could help somewhat.

Hope you can fix it.

regards

Triarcuate

You need to clean the pcb and remove dried spillage residue

you could try wasking the rubber contacts but these may need to b ereaplaced.