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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Availability of a Roland 100 pin IC?
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? |
#2
Posted to sci.electronics.repair
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Availability of a Roland 100 pin IC?
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. |
#3
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Availability of a Roland 100 pin IC?
N_Cook wrote:
r02455212, demultiplexer for 7 octave keyboard Roland RD 300SX. I Googled that part number and it seems to also have been used on a semi-recent (about 2012) keyboard, RD-700NX. This guy took his apart to look at it, and provided an inventory of the major ICs: http://www.pianoworld.com/forum/ubbt..._RD_700NX.html 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? Have you taken the revolutionary step of asking Roland? Matt Roberds |
#4
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Availability of a Roland 100 pin IC?
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 . |
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