Roland juno-d, keys are either too loud or too

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

Did you clean these contacts with ONLY isoprophyl 99% alcohol and Qtips? If you used another product you may have spoiled the contacts. Also did you clean the circuit board where they contact with the same product?

If you used another cleaner, best to redo your work... quickly... Contact cleaners such as Deoxit and Blue shower destroy this type contact.

The key contacts have become contaminated. Disaasemble and find the contacts under silicone rubber domes. They are typically black conductive rubber pills, two per key. Clean them and the circuit traces they press against under them with ONLY 99% isoprophyl alcohol and Q Tips GENTLY. Then reassemble and test operation.

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.

Usually there are a number of screws from the bottom to remove. SOmetimes they hide some under a label or rubber feet. The top should remove and pone must be careful of the cables from teh top to the base of the unit.

Keep track of where screws go as often they have different length and using the wrong length when re-assmbling caan cause trouble.

Answer:
Before i give you the right solution, i have to say that i have posted the answer to FIX the problem of all of the contact problems, people writing in how many of their keys are not working. And the post that they are showing is one that says to clean the contacts. That will not work.
Ok,
the answer.....
You can purchase a kit called Rubber contact kit here: http://www.mcmelectronics.com/product/20-3890&cid=prodCrossSell
or
Key contact Kit:
http://www.oaktreeent.com/Roland_Keyboard_Parts_Units.htm

These kit are made to re-coat the contacts on the keys. It will bring your board back to brand new condition and last as long if not longer than the original coating.
Also can be used for any rubber contacts like remotes or game controllers. etc.
This will work and i did mine after numerous times of taking the keys off and cleaning them.
I hope this gets out to all of you that are having the same problem.
Good luck

Your key contacts are dirty. Disassemble and clean both the circuit traces and the conductive rubber pills with ONLY 99% isoprophyl alcohol and QTips.

The contaacts are in pais which allows for measuring key velocity. When contacts are dirty, this affects the loudness.

The conductive rubber pill contacts AND the traces oin the circuit board should be cleaned with 99% isoprophyl alcohol, nothing else. Use a Q-Tip moistened with the alcohol.

You may need to clean the contacts which are usually conductive rubber. I explained stuff for another Roland problem with two keys that were intermittent. I have an EP-7 that I had to do the cleaning of the key contacts. Use 91 or 99 % Isoprophyl alcohol to clean BOTH the conductive "pill" (Black under silicone rubber domes) AND the traces on the board where they press. Clean gently as the traces have a hard black coating.

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!!!!