Hello everyone, I come to you since a long time ago I acquired this UMK3 that had several problems and solved almost all of them except the audio problem. It throws me u1 non-operational and the DS1 led does not turn on and I changed two ADSP 2105 and the fault persists and compared with the schematic manual of the mk2 and I see that they are almost the same and on pin 19 of the 2105 the DSP IRQ is supposed to carry +5v apart from another input signal (as the schematic diagram is needed 
) and I see that there is no voltage or signal from the oscilloscope, is it normal? Has anyone had the same problem?
thanks for your time and help regards
) and I see that there is no voltage or signal from the oscilloscope, is it normal? Has anyone had the same problem?thanks for your time and help regards