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Hi, This is probably due to worn rubber contacts. The sound is switched by pressing a key which in turns press a carbon contact on the PCB under the key. In time these wear out and need to be replaced.
Firstly open up the keyboard and locate the rubber contacts, check to see if each one is seated squarely, if they are not seat straight then this can create the problem you mention.
If all are OK then you will need to replace the strip which is causing a problem.
Spares are available from many sources including :
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.
You will need the CDROM that should have come with the keyboard when you purchased it. On it will be the drivers that need to be on the computer for it to use the usb. The link to the manual is here:http://www2.yamaha.co.jp/manual/pdf/emi/english/port/psri425_en_om_a0.pdf Please look at page 86. If you don't have the CDROM you may be able to download what you need by contacting Yamaha by email through this link and asking:http://www.global.yamaha.com/support/contact.php I hope this helps.
I've had the very same problem twice so far. The only solution I
figured is to simpy purchase an equivalent key (contact Yamaha service
in your country for this) and to replace the broken one. The reason why
the key doesn't work smoothly as the other one is not dirt therefore
any cleaning won't help. The key is cracked deep in the place where
it's attached to its 'axis'. So you'll need to remove all the screws
and unmount the cover (it needs a sideshift to open once the screws are
removed), be careful with the speaker wires. However you'll need firm
moves anyway. Opening is tricky and gets me surprised anytime I do it
so you'll need some courage :). Replacing the key is even more tricky.
You'll have to remove the broken one by pulling it horizontaly (use
some force, it's broken anyway). Placing a new key you'll need to
uplift the 'hammer' and then slide a new one. I'm sure you'll figure it
out once you see it with your own eyes (it's really hard to decribe but
not so hard to do it). Hope you'll do fine. I haven't tried glueing the
crack for I doubt it would work for long. Good luck!