Does anyone have any knowledge on circuit boards??
Posted 10 November 2012 - 02:36 PM
I have 2 boards and with one i plug all the motors in and only one runs and never shuts off until i unplug the controller
The second on i have worked perfectly and now it doesnt!! is it possible to burn out or short out these boards???
Posted 10 November 2012 - 05:43 PM
Get a magnifying glass and examine each board for cracks or broken solder connections. If you put these boards in and took them out repeatedly, there could have been some stresses involved that caused a malfunction.
You could mess up the board by over tightening a mounting screw, for instance. Some devices are designed without any margin for error, and if you don't handle it right, it fails.
Sometimes, though, what you think is the problem isn't.
Are both motors good?
Is the power supply working correctly?
Is each connection to the board free of damage and clean?
EDIT: I just read the OTHER post on the same subject and Dan h is right. (Or as right as its possible to be in this case!) You didn't mention you plugged it in wrong. When the board gets hot that's bad, so I'd guess that you burned something out. The power requirements are 9 volt to 12 volt, and depending on your source the "12 volts" you are using could be more than that. But if you got it plugged in wrong anything could happen. I'd use a 9 volt battery next time.
Posted 11 November 2012 - 07:38 PM
Hard to diagnose, even harder to fix. Start repacing chips and hoping. Boards are normally robust enough to not be affected.
Posted 12 November 2012 - 11:50 AM
Posted 13 November 2012 - 09:39 AM
Posted 13 November 2012 - 11:13 AM
When it comes to the these GOTO system, 9 times out of 10 the problem is that someone used the wrong the polarity on the power supply and/or jammed one of the motors so it draws too much current. With either of these conditions what it does is fry the voltage requlator on the board. They use a surface mount regulator that is designed for less then 1 amp of draw. So the first place I would check is what was polarity of the power supply and then check the input and output of the regulator.
One the Meade ETX systems the regulator is listed at 500ma and is not reverse polarity protected. The fix has been to cut the traces going to the regulator and install a LM7805 regulator that cost $1.50 at Radio Shack and can easily handle over a 1 amp of draw and is reverse polarity protected.
Posted 13 November 2012 - 04:42 PM
Posted 14 November 2012 - 02:13 PM
Would be difficult to troubleshoot PWB w/o schematic unless something is smoked, but would still need schematic to determine what was smoked.
My advice is to return to factory for eval/repair before you do any real damage to the unit by resoldering joints, replacing SOT package regulators w/ TO-5 regulators, etc.
Not sure how you would have damaged a 3 terminal regulator as all types have thermal shutdown, and how would you have applied reverse power?
Try the factory or someone that works for a living repairing electronics.
Posted 14 November 2012 - 04:07 PM
But and this is a big but!! the first one works still but only one motor driver or leg should i say works and the other leg doesnt.
Circuit boards are sure fun to learn about but are very very delicate hahaha i bought an arduino motor shield and the atmega365 and i have had so much fun writing the codes and programs for it
so this is a learning process for me , although the 2 boards i burnt out i needed for my drive system i am learning from my mistakes