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Check the power adapter at the coaxial plug end that plugs into keyboard- is there power there? If so, is the socket on the keyboard loose at all? If so- the socket may be broken, If there is no power there, you either need a new power supply or you need to open it up to see if it is just the fues in that supply that failed.
If the plug inserts snugly as it did when new and it dopes not power up, the issue may be the power switch on the back- it may have dirty or corroded contacts- cycling the switch on and off several times rapidly should clean it.
If it still does not power up, there should be a fuse internal to the keyboard that would require you open it up to check it. If it is not under warranty, this is not an issue- if it is under warranty, it is something that should be checked in the shop.
You need to turn off the echo of the MIDI that sends the signals back to the Juno. When near simulataneous MIDI signals are mixed the decoder can receive "partial" messages that re-trigger the notes and then miss the note off commands. If you can't find the setting in the software, disconnect the input to the Juno MIDI while recording it.
I would recommend taking it in to be repaired. If they service Roland products they will have access to any parts it needs. It sounds like the key contacts are damaged or dirty. In either case it is not easy to disassemble the Juno because of the internal wiring. It needs to be reassembled perfectly for it to work properly and it is easy to damage something during disassembly. Hope this helps.
Here is the link you need but pay absolute attention to the Please note section in each case as the Juno D LE and the original Juno D are different. If you install the wrong update you will have problems with the keyboard working at all.
If you have the new Juno here is a link to their update:http://www.rolandus.com/products/productdetails.php?ProductId=429 Also try looking in your manual for the initialisation procedure. This will return your keyboard to the factory settings .
The problem of the Juno-D is de rubber strips inside under the keysthere are 5 strips, you have to clean this rubber strips with alcohol and clean the board too, this will resolve your problem if you leave the Juno-D without playing for a long period you will get the same problem again. this is a very poor keyboard it,s a pitty that Roland Make so poor keyboard!!!!
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