Asked — Edited
Resolved by Andy Roid!
Battery fully charged showing 8.4 v on my voltmeter, checked connections several times, but brain not powering up. Need help as my kids are anxious to start programming the bot.
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1) Consult this tutorial: http://www.ez-robot.com/Tutorials/Lesson/69?courseId=3
2) Let us know if you see any plugs or wires disconnected from inside the robot
And welcome to the forum!
Further to what DJ has mentioned above, one possible cause for now power could be that the fuse needs replacing. The tutorial for fuse reacement in below...
Roli Fuse Replacement
Maybe you could take a few pictures of it so we could see the wiring for ourselves. Often experienced eyes can catch details the new user can miss. A good shot of the EZB4 (brain) where all the wires plug in would be very helpful. If you already have the body open, some shots inside of it would be good as well. That's what's great about the internet, instant visual communications.
I just recalled that the Roli also contains an HBridge device. This is a higher current device for driving the tread wheel motors. A good, close up shot of it would also be helpful.
Also, is it possible that, when you placed a jumper across the switch you may have touched something else as well? I don't have a Roli so I don't know how likely that would be, but I thought I would ask.
Where are you located? If you are in the DC/Baltimore megalopolis, I could arrange to meet you Sunday and help troubleshoot in person (I really wish the forum displayed more than just country for location).
I would like to know if the EZB is ok. The heavy current draw could be from the H Bridge and by disconnecting it that concern is eliminated.
I am sorry you are having a problem. This is not a normal issue with the EZB products. I know DJ's staff and the Community will help you get the issues resolved.
H-bridge appears to be wired properly. I suspect the bad switch may be the issue.
We all hope it is just a bad switch.
You have to consider that if the ez robot servos were to indeed smoke and quit if you plugged them in backwards, wouldn't we have a crap load of posts from people that accidently plugged servos in backwards and smoked their servos?
If there are no definite shorts seen, wiring is correct, the fuse is good and the switch is good it may be a bad H Bridge. let us know how you make out. You should then Contact EZ Robot and refer to this thread.
We will continue to monitor your threads.
To do this, however, you would have to disconnect the wires going to the HBridge and EZB4. Perhaps some others as well. I can't say for sure since I don't have a Roli to check with. In any event, once done you could check out the wiring harness for a short using the wires on the switch. Be sure the switch is set to OFF. Yes, I know it's open anyway, but just to be sure. One wire from the switch should go to the battery and the other to the circuitry. What you want to measure across is the switch wire NOT going to the battery and the OTHER end of the battery. Be sure to measure those points with the Volt-Meter first to be certain there is no voltage between the two points. If there is, that alone could indicate a short. and you would not do any ohm-meter test of course. If there is zero volts, then use a low ohm-meter scale, measuring across the same points. That should at least tell you if there is a short.