The audio power amps work fine, as proven by putting an audio signal into the AUX inputs. (It takes its power supply voltages from before the IC regulators used to power the mainboard.)
Sometimes the keys will respond with low level distorted sounds, but mostly do not respond.
No physical signs of damage.
The power supply buses to the mainboard are +12V, -12V and +5V. The -12V line uses a typical 79M12 regulator. That line is only -11.8; close, but from experience I thought these things were pretty much spot on. There is certainly a smell around the power supply area of overheating/burning but nothing obvious to be seen.
Any thoughts are appreciated.
Yamaha Clavinova Keyboard CLP-550 ROM Chip Failure
It has been discovered that the code inside the 3 main ROMs of the CLP-550 degenerates over time causing failure of the piano to operate. The technology of the time for those original ROM chips was at the very leading edge of density, hence the cause of the eventual failure.
Through the efforts of many enthusiasts we have recovered the code for these ROMs and make it available here. Use an EEPROM burner to burn the attached binary files. Current EEPROMs to use are type 27C040
.
Sometimes the keys will respond with low level distorted sounds, but mostly do not respond.
No physical signs of damage.
The power supply buses to the mainboard are +12V, -12V and +5V. The -12V line uses a typical 79M12 regulator. That line is only -11.8; close, but from experience I thought these things were pretty much spot on. There is certainly a smell around the power supply area of overheating/burning but nothing obvious to be seen.
Any thoughts are appreciated.
Yamaha Clavinova Keyboard CLP-550 ROM Chip Failure
It has been discovered that the code inside the 3 main ROMs of the CLP-550 degenerates over time causing failure of the piano to operate. The technology of the time for those original ROM chips was at the very leading edge of density, hence the cause of the eventual failure.
Through the efforts of many enthusiasts we have recovered the code for these ROMs and make it available here. Use an EEPROM burner to burn the attached binary files. Current EEPROMs to use are type 27C040
.
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