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Look near the end of the roll for a hole or other trigger method that triggers the stop. It could be a hole in just one column or possibly a heavy mark on the roll. The later would be sensed by an optical pickup which MIGHT have a lamp burned out. From the site:
In General MIDI, the grand piano is defaulted to MIDI channel 1.
IF you have a device that responds to "General MIDI" format, just send the MIDI data to channel one and you should be fine. Remember that pianos are VELOCITY controlled and usually don't use after touch so you have to generate appropriate velocity for EACH note if you are using an editor.
Did you ever get hold of an FP-8 service manual? The weight replacement is relatively simple: The case opens by removal of eight screws, four at each end on the underside. The top then hinges up. Keyboard assembly is removed by first unplugging the two white ribbon connectors at the center, then removing the screws at the front edge (underneath) and the screws (gold) at the back of the assembly (accessible from the top). Keys pop out by spreading the two "wings" at the pivot point, and then the weights (Roland calls them "hammers") lift out. Roland will sell you new ones, but I have no idea whether the replacements are any better than the originals. I've done two of these pianos so far, and have a third waiting to be worked on. I do have a service manual, but I think I downloaded it freebee somewhere.
The other failure mode on this piano is the electolytic coupling caps on the output board - I've replaced all of them on both pianos - don't remember the value offhand.
I have a Korg Concert Piano (C-15S) which was working perfectly till about two months ago. I have been on vacation for two months, had left the piano unplugged from the electric supply point, but on re-connecting now, I get no sound from it. Is there a reset button (or other device) that I may have to use? Appreciate your advice.