Some keys of my Juno Di got Out of tuned :( pls help

https://www.roland.com/uk/products/juno-ds/
https://www.sweetwater.com/store/detail/JunoDS61--roland-juno-ds61-61-key-synthesizer/reviews
https://www.sweetwater.com/store/detail/JunoDS61--roland-juno-ds61-61-key-synthesizer/reviews
https://www.rolandus.com/blog/tag/juno-di/
https://www.amazon.com/Roland-Lightweight-Weighted-action-Keyboard-JUNO-DS61/dp/B016NUAL5Y

Whether it happens to all of the key?
If yes, transpose setting may have changed. Change the setting to normal (0).
If the normal transpose, but tuning is still not standardized, check Pitch Setting.
To Restore Standard Pitch setting:
Hold down the A-1, B-1, C0 and C # 0 keys simultaneously and press any key between C3 and B3.
View image :


If the above procedure is still no effect, try resetting the factory settings / Initialize overall: :
This is the steps:
Initializing the Settings
When you initialize the settings, all backup data stored to this instrument will be initialized and reset to the factory default settings.
Turn off the power to the instrument. Then, simultaneously hold down the C7 key (right-most key on the keyboard) and turn the power on again.

NOTICE
Do not turn off the power to this instrument while it is initializing the data in its internal memory (that is, while the button indicators are flashing).

View image:




Notes:
If this instrument somehow becomes disabled or malfunctions, turn off the power to the instrument, then perform the initialization procedure.

Unfortunately, the manual on
http://www.korg.com/us/products/tuners/ga_40/

indicates that 12 string is not supported.

The owners manual can be downloaded at
http://i.korg.com/uploads/Support/GA40_EFG1_633661472559800000.pdf

The YouTube tutorial is at
https://www.youtube.com/watch?v=Of4CRajvq0E

with a 12 string, you can often tune the octave until the tuner sees the matching note. It won't see the correct string number, but an A note is an A note, whether or not it's an octave higher.

Hope that this helps.

Hi, You can reset your whole keyboard by holding down the top C ( highest key ) whilst turning on.

This is unlikely to clear 3 non working keys. My guess is that the contacts under the rubber switches have worn or dust is under the contacts. You could try cleaning first under the rubber contacts if this fails replace the contacts ( 1 per octave ) Part WF212202 contact me if you need more information

Pictures attached may help

Take it in for repair. There may be a broken line for the velocity sensing of that octave of keys that is causing the velocity to be sensed low. The repair is NOT DIY if this is the case.

The key contacts need to be cleaned. They are usually conductive rubber pills in silicone domes that get pressed onto circuitboard traces by the keys. Disassemble to get at the contacts. clean ONLY with 99% isoprophyl alocohol and Q tips. Clean both the pills AND the circuit traces they contact.

Be very careful of cables when opening the unit. Document where all the screws go and their length and threads.

Not sure what you mean by "buttons". IF you are trying to change voices, a lag between sounding of the old and new voice can be expected as the generators within the synth are reconfigured for the new voice. This is a lower-end synth and as a result doesn't haved the performance of some of the newer ones.

If the lag is just between notes that are being keyed using the same voice, that is too much delay and something is probably set wrong.

The next step gets very complicated without test equipment.

It is important to realize how these keyboards work. ( I assumed you cleaned the black rubber dot that forms the contact.)

The keys are "scanned" by the electronics. Usually 12 bits are read at a time and the computer scans through the banks of keys that are usually 1 octave at a time and two per bank to enabling reading the velocity as the contacts for a key close one slightly behiund the other.

If there is any deformation of the contact bearing dome, that will cause a velocity sensing problem.

The keys are scanned as a matrix. To avoid current going backward through keys in other octaves, there are disconnect diodes that prevent coupling of one octave with another and between the two sets of contacts (for velocity sensing) within a single octave.

Do verrify that you cleaned the board and the black rubber dots with 99% isoprophyl alcohol and NOT rubbing alcohol as the latter contains an oil that worsens the problem.

Either the first or second closure matrix line for the "A" keys is bad.

This may be a cracked or shorted circuit board.

A bank of diodes is used to prevent sneak electrical path if more than one octave has notes pressed.

First thing is to clean ALL the key contact areas and the conductive rubber pills with 99% isoprophyl alcohol.

This involves dis-assembly of the key area. If you are not competent in electronics, best left to a pro shop.

The keys are scanned in a matrix, two contacts per key and all the individual notes are in common (all the "A;s", "B's"...) And each octave is strobed for the first set of contacts and then for the second set of contacts. an the whole octave is read in parallel.

The reason for two contacts is one closes first and then the other as a key is lowered. The time between these is measured and is the note VELOCITY which for a piano controls the loadness of the note. IF ONE of the two fail, the loudness will vary as yours does.

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!!!!