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So you're saying with headphones you also only hear one side? I would suspect the internal amp is panned all to one side. There are also several other settings in this unit where pan can be set so you may have to check several areas. If you don't have any specific custom settings made I would try a restore to factory defaults. If that doesn't resolve it you likely have a hardware failure which is likely not repairable. I strongly suspect a panning issue though.
I have been trying to find a schematic, however the damage should be limited in the unit.
Since there is only 9VAC input, we know that it has to go through a rectifier and a filter capacitor and then likely a regulator. I doubt the problem goes beyond the regulator.
The screen light MAY be independent of the logic power in the unit, the LED's will NOT be independent.
The voltage rating of the fuse is NOT a problem.
You likely blew out the rectifiers as a start. They may be individual diodes or a small module with four diodes inside.
The diodes SHOULD have survived but check them with an ohmmeter on the diode range. The Filter cap may be destroyed, and alsothe regulator which is likely a three terminal one like a 7805.
Here is a link to a site with all the info you need:http://forum.recordingreview.com/f18/midi-troubleshooting-101-a-5208/ You will need to join which is free and well worth the time. I also recommend downloading the free book Killer Home Recording Setting UP.
I am not familiar with your exact model, but if the plastic "hinge" for the button has broken, it is possible to "fix" it. This is not a DIY repair though. Can you tell me where you are located so I can perhaps suggest a repair location?
If this is happening on all keys it sounds like your aftertouch is not set right. You may not have gotten the key assembly lined up quite right also. Check these first.
try cleaning ALL the contacts involved with Caig DeOxit (D5, S5. F6, G5, etc.) products*, they work very well. e.g.; cables, inputs, outputs, and (if you're confident) all the contact points "under the hood". this static you speak of sounds like less than stellar contact points and can addressed at home if you've the motivation to DIY.
* amazon.com/D5S6-Contact-Cleaner-F5S-H6-FaderLube/dp/B00HNV7WI2?SubscriptionId=AKIAILSHYYTFIVPWUY6Q&tag=duckduckgo-d-20&linkCode=xm2&camp=2025&creative=165953&creativeASIN=B00HNV7WI2
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