On 15/09/2015 00:08, Clifford Heath wrote:
On 17/09/15 18:39, N_Cook wrote:
r02455212, demultiplexer for 7 octave keyboard Roland RD 300SX.
Assuming a spares or repair broken piano is not available. Is the IC
likely to be obtainable through the barrage of scammers, timewasters and
googlead revenue crap, to genuinly purchase one from the far east?
As no reference on ebay, I assume all the apparent "sellers" is a big
pile of doodoo
The die is cracked or failed lead-out wire, on the common for one 8 note
bank of keys.

I read the schematic for my Roland HP3000 once, and thought that chip
was probably a custom-programmed CPLD/EPLD. Are you sure you couldn't
program such a chip as a replacement?


Probably more difficult than getting an IC out of Roland/Boss. The sort
of thing I might attempt if it was a repair job for myself , but I doubt
the owner would want to pay me to construct a glorified look-up table
and then all the debugging, Plus desolder/soldering .