Ensoniq TS-10 repair
Field Notes Keyboard Calibration Error TS-10 and ASR-10 use essentially the same keybed Schematics for Upper and Lower boards from Tauntek - a godsend! A healthy board initializes without error With no keys installed With some keys installed This can be useful when troubleshooting - no need to completely install the keys just to test I was also able to install a few of the keys and power up the synth, play those and ensure all is working and progress from there When the "Keyboard Calibration Error" is displayed, keyboard scanning seems to operate normally - you can scope the HC238 components and U1,2,4 for scan frequencies: U2 legs 18,19,20,21 show the L/C frequencies as described in the schematics above ("Lower") U3 legs 2,3,4,5 are the A0..3 lines - controlling the 4 HC238 chips When bared, make sure your hands are not near the keybed during initialization - even resting your finger on the board may produce a failed initialization The measured freq...