By SWBeebe
Mon Mar 06, 2017 9:06 pm
I have an Akai S900 that any samples played through the CH4 output, plays at twice the normal speed. I have tracked it to the CPU PCB, but the CPU schematic is not in the S900 service manual. I was using a CPU schematic from a S950 manual, but I cannot find a clean one. I am seeing double the clock on the DADV3 and DMAK3 lines which come from IC4. All the other channels run at 11.78kHz and this runs at 23.6kHz. They all share the same master clock, and that's about as far as I can go using the S950 manual. (To broken up to read and my limited knowledge of direct memory access controllers) I have tried to replace IC4 with no change. I then tried a set of V1.2 EEPROMs with no change, so I reinstalled the V1.2A IC's. Anyone with some advice?