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Re: Roland fantom g8, problem, The last 2 octaves do not...
Read page 135 regarding the note range settings. Look also for keyboard split information. You may have the keyboard set to NOT play notes in the top octaves for the particular voice you are using.
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Will probably need to be diassembled and cleaned. Either a sticking key or a compromised contact on the circuit board. Any electronics repair shop should be able to fix this.
Somehow you have activated the mode to download a new operating system into the unit. It likely is expecting the new SW to be presented form source such as MIDI, USB, or stick.
Get it out of that mode before something gets clobbered. DO a Factory reset which will consists of holding certain buttons and turning power on. Find this procedure in your user manual.
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.
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