[Czink Attila]

This link from Panasonic AN8053N don't eqvival the logo "M" manufacturer's AN8053. The Panasonic ic pin nr. 12 is N.C. But the Casio SA-20 (and SA-21) is included 3 panel 1st is the Amp-connect-sabilisher-power on/off. 2nd panel is the sound generator, and selecting keyboard (diode-matrix) 3rd is the musical keyboard diode matrix. The panels are interconnect 7, and 12 cable bus. The 7-line bus as inter 1st and 2nd panel. The Bus 3rd line DIRECT CONNECT the IC AN 8053 pin 12 with LSI IC, but I don't count the LSI pin nr. I buying the IC AN8053N, but not working after repaired. Is for me one SA-21, not electrical error. (crashed) After changed 1st panel, the SA-20 is working. (without error up to 13 VCC!!! but the panasonic ic total max.11,5 VCC!!) When disconnect the IC pin 12 (on cable bus desoldered the cable) sinth is not work, I measured, power state is ON, but muted (no sound). Bound in parallel with yet, onto a first panel works hardly, that panel can sound only then, on what the 3. thread is tied up the 12 one onto leading out- as an interest. The 12 one him leading out for IC so important function, despite this on all of the available datasheet N.C. it is nominated. A what kind of trademark the characteristic angular one masks anyway M logo? Would interest. >>>Czink Attila, "garage-electronic" man, Hungary. [email protected]