Is there a master reset

When you turn on your keyboard it carries out a self check to make sure all is OK, if not the start up procedure stops

It could be a fault on the mainboard, the rubber switched do wear but as the light is coming on it would indicate this is working

Try a master reset : whilst switched off, hold down the highest note (Top C) and whilst holding down turn on, after a few seconds if this is successful then the display will show up, this function resets to factory setup

If this fails you will need to investigae board connections etc inside the keyboard

Good luck

Try a master reset to start with.
Turn keyboard off
Turn on whilst holding down highest note on keyboard
Once screen display has complete release key

This will reset to factory settings.
If this doesn't work report back and we can maybe try other solutions.

Dan
Becketts Music Ltd

Yes there's a way. Use Registration Memory (I shorten it to: RM) ..
RM have 8 banks and 4 bank numbers. For changing banks, press BANK several times.
Example :

• choose tone (eg:500)
• press BANK where you want to store. (eg:1)
• while holding down STORE button,press registration number where you want to store (eg:3) Release store button. Finish.

Next :

• choose tone (eg:038)
• press BANK where you want to store. (eg:1)
• while holding down STORE button,press registration number where you want to store (eg:4) Release store button. Finish.

Anytime you press RM bank 1 number 3 (one key), the sound is 500
Anytime you press RM bank 1 number 4 (one key), the sound is 038.

Notes:

• RM not only can save tone, but can store style,overall setting live performance,etc.
• RM functions are disabled while you are using the SMF player, song memory or demo.
• RM are also disabled while you are using the floppy disk drive.

When you press the accomp button does it show up in screen?

If not you have a button/switch issue.

Try a master reset - hold down top / highest note whilst turning on.

This will factory reset and may clear the issue.

I suspect you keyboard is split. Please check - if so unsplit the keyboard.

Hi, This and a lot of similar keyboards have gold flashed pads on the PCB and the keys press one or two rubber caps, with conductive pads in them, down.
Clean the pads with isopropanol, (and nothing else) and it will be cured 99% of the time. If a few notes do not work, especially after heavy use, then the rubber caps can be replaced.
Taking the keyboard apart is long winded because of the number of screws involved.
The job its self is simple enough, but take note of the order things go in and where the screws go.
Hope this helps, Chris.

Turn the Keyboard off the press and while holding down the [TONE] AND [FUNCTION] buttons power on the keyboard. Wait until all reset is done.

You might chek if one of the buttons MIGHT bee stuck down confusing the processor in it. Do a factory reset as well.

It will require repair. I suspect by you description that the D-A convertor has failed. This is a chip that is far beyond a DIY project to change. Do further testing to make sure the power supply voltages are correct and that headphone output sounds the same problem.

Here is your service manual: http://elektrotanya.com/korg_pa800_sm.pdf/download.html

Scroll down to "get manual" and click to download the manual. IGNORE other download links.

According to the manual for the 496, "All keyboard settings are returned to their initial defaults whenever keyboard power is turned back on after being turned off by operation of the Power/Mode switch or Auto Power Off.