musicman282
Active member
I hope you experts can help me repair my road show pin. Red's mouth isn't working correctly anymore. It runs very slowly and sometimes doesn't run at all. I've swapped the plugs on the H-motor drive board to test the motor and it runs perfectly on the Ted side. I've replaced all the transistors in on the drive board, both the tip102's and tip107's. I also used my scope to make sure I was getting the proper direction and enable signals from the logic boards. I'm pretty much stumped at this point. I tested continuity on all the components. I'm not sure what else to check on this board. I've tried comparing voltages with the driver circuit for ted, but it is kind of hard since it cycles in the test mode as opposed to having stable voltages. It also appears that the quad op-amp chip is producing the correct voltages. Anyone have any suggestions about where to look on this board. I'm guessing that the circuit is just not producing enough current to drive the motor because it is switching directions correctly. Anyone have this problem before? I figured it was the transistors causing the problem. They tested ok, but figured I'd replace them anyways.
Thanks in advance.
Thanks in advance.
