FACTORY RESET ON KORG pa50SD - Korg Pa50 Professional Arranger Keyboard with SD Card Slot

Go To www.korg.com and go to support

For the best info contact Korg customer support. Here is the link-

http://www.korg.com/us/support/contact

It's about hardwares.
If dead keys are the same notes(C2-C3-C4 or E2-E3-E5 etc),its electronic parts problem.
If dead keys are random(D1-F1-G3-B5 etc),chances are :

• Rubber keypads is break. Below the keyboard. Replace it.
• Dust can cause bad contact the carbon inside the rubber keypad. Clean it.

Here is a link to your manual, it should tell you how to do a factory reset somewhere in it. Hope this helps.
http://www.korg.com/uploads/Support/Pa50SD-UM-ENG_634618903911880000.pdf

Please see "Loading Korg Pa50SD's Operating System" below for
instructions on how to load the operating system.

para resetear el pa50sd
Please see "Loading Korg Pa50SD's Operating System" below for
instructions on how to load the operating system.

Have the same issue

i use korgpa50sd i had some voices by default but once when i inserted my sd card into the arranger every voices got deleted and now everything is new...so can you please help me to get back the old voices?

NOT a fuse... thaat person knows nothing. There is something wrong for sure. Check if one of the buttons or keys MIGHT be stuck down (depressed). Sometimes the units check that all the control buttons are up and they don't really tell you why they fail to start. Beyond this a repair shop is in order.

1. Power-off the PS60.
2. While holding down the four PERFORMANCE buttons and the OCTAVE DOWN button, power- on the PS60. The PS60 will be initialized, and the factory-set data will be written into internal memory. The display will indicate "Initializing..." while data is being written. Never turn off the power while this indication is shown.

Manual available here:
http://www.korg.co.uk/downloads/ps60/docs/PS60_OM_E1.pdf