Hi civias,civias wrote:3. It can't be a mechanical or hardware problem, transpose buttons work just fine. Tested them excessively today. Both, left and right hand sides are being transposed accurately on every single touch. However, the right side remains always 2 full semitones (+5 fine detuning units too high)
6. Two things that keeps me puzzled:
a) When I hold let's say G Mayor in the left side, and play the melody in A Mayor (sure ain't easy) from time to time for, just a split second the let's call it "error" dissapears. But right the next moment it's back and stays for a most of the time. Like it works for 1 second out of 60 seconds as it should.
b) How come it's not exactly 2 semitones apart, where does the +5 fine detuning units come from?
Just some thoughts, take them for what they are worth, and form your own conclusions ....
1. Forum members cannot recreate the problem using our own keyboards. This means there is either a software or a hardware fault on your Pa800.
2. Similar problems on my own Pa2x keyboard (distorted sounds etc) were caused by data corruption inside the SSD, and were solved by following the "Pa2x_format.pkg" procedure that Pete referred you to. In your case. the procedure would involve first running "Pa800_format.pkg" followed by the huge file "Pa800_os_res_v201.pkg" which takes a long time to download. This procedure completely reformats the SSD to the factory state. I believe you confirmed you have done that, though the details in your message seem a little vague ... which is the reason I am spelling it out again ... if this is not the solution, then it is likely to be expensive to fix I am afraid.
3. The symptoms you describe could be caused by a failure with the circuitry associated with the sound generator ASIC which is called the "big endian" in the service manual, and which is a proprietary chip made by Korg. For example, a short between two address lines associated with the synthesis channels for the upper sound banks might explain the constant offset of 2 semitones + 5 cents. Maybe 2 semitones + 5 cents in the audio domain corresponds to exactly some binary offset value maybe 32, 64, 128, 256 etc in the data domain? That's why I think it may be symptomatic of two adjacent address lines shorting, or perhaps a single address line being permanently disconnected.
4. I suspect that the CPU circuit board which contains the "Big Endian" sound generator IC will have to be replaced. If I was a service center I would swap this board in the first instance with a known good board, and see if the fault goes away. On the Pa2x, this board is part number GRA1002100, but I do not know the corresponding part number for your Pa800 which uses a different board.
Best regards,
Rob
