RC10Talk - The Net's Largest Vintage R/C Community

Repairing vintage escs can be a great learning experience. Half the battle is tracing out the circuits and part number research for compatible replacements. I test functionality with a voltage supply that has adjustable current output. I wire a small 380 motor to check operation since it has low current consumption.

Another very useful thing for troubleshooting is a good optical scope. Many failed components can be found using the scope and looking for signs of part stress or overheating. I use something similar to this and have pretty good success repairing the EBay "working" escs.
Another must have is a decent fluke digital multimeter and basic electronic troubleshooting knowledge. Look up the part numbers with google search and find the data sheets for the components. They really help to reverse engineer the circuits.

Finally found one on ebay. It came with the instructional booklet too! So excited to try it out.

Instructional booklet

Nice find. Looks like it still has plastic film on the keyboard too

Yes!!! I don’t want to remove it