Digital Signal Processing. Again, it is not the Sound File memory for the 5V, but the preloaded flash code memory. So they did. That is why originally, when you ordered boards you gave the part number and sound file required as a product number.
The original 5V could have had one of those solid shorts on the PV side of the board. That would cause a high amperage on the AC input. When testing boards I use the Z-4000 and watch the current. Some 5V just dead no draw. Some draw a small current around .5amps but still dead, and other go up to 5-8amps depending on voltage applied. If he had a dead short failure like that and did not realize it leaving power applied for some time, those input wires would melt. Even seen the connector melted into a blob.
John, I will send the files. G
