The left part of the schematic is about as simple as possible. We start at the top left and continue in normal reading direction. Here is the complete schematic in all it’s glory. I rebuilt the schematics of the PCB in KiCad.
That all values are correct, because at some places I have the nagging feeling that the values are not matching my expectations. I took the values from resistors from their marking visible on the images. Lastly, I added all part references and as much part information as possible, i.e. I can match the position to the image of the front side of the PCB and still read parts numbers. Most of the colors are just randomly chosen, but the yellow area is the +5V VCC line and the 0V areas are marked blue.Īfterwards I added all the components on a second layer.
Then I started with marking most of the copper traces in different colors. So this view is kind of an “X-Ray” view through the front side of the PCB. I started with a picture of the copper side of the PCB which I flipped horizontally, My process of reverse engineering can be seen in the following picture (click for large version). Some of the parts are similar to other “flavors” of the 858D, but some seem to be different. Now it is time to really reverse engineer the main PCB. Recently, I posted the teardown of my Saike 858D SMD rework station.
