Ok, so I bought a couple of 4k crashed cameras to try to learn how to repair them. They had broken yaw and roll arms which I replaced with 3d printed parts. That all worked well, except the cameras don't initialize when the P3 is powered up. I have found that there are 2 fuses on the gimbal circuit board, and without schematics I assume the are for each arm motor, both are blown. I have not tried to replace them yet as I see there are several smaller fuses on the circuit. Has anyone had any experience with these? I would really like to build a arm motor tester, but am unsure of the voltages.