http://forums.leaflabs.com/topic.php?id=9424 A place to share, learn, and grow... en-US Fri, 22 Jan 2016 00:07:30 +0000 http://bbpress.org/?v=1.0.2 q http://forums.leaflabs.com/search.php http://forums.leaflabs.com/topic.php?id=9424#post-20808 Tue, 06 Nov 2012 00:06:50 +0000 mikep 20808@http://forums.leaflabs.com/ <p>One more thing: in the picture you posted, the jumper is set to USB power and not to EXT.<br /> Based on the schematic there should be no way the diode can be fried that way, unless there is a short on the board itself to ground. Were the jumpers like that when you attached the external power? </p> http://forums.leaflabs.com/topic.php?id=9424#post-20791 Mon, 05 Nov 2012 17:35:56 +0000 feurig 20791@http://forums.leaflabs.com/ <p>that looks like a 1n148 size diode. Those are only good to about 300 ma in the forward direction which is probably a good thing since the regulators on the maple are good for about that as well. But if you let the smoke out of the diode chances are something is shorted out somewhere else. </p> http://forums.leaflabs.com/topic.php?id=9424#post-20789 Mon, 05 Nov 2012 13:48:28 +0000 mikep 20789@http://forums.leaflabs.com/ <p>Hi Ksandr,</p> <p>I am not a member of LeafLabs, but the schematic of the Maple R5 board is located here:</p> <p><a href="https://github.com/leaflabs/maple/blob/master/maple-r5/maple-r5-schematic.pdf" rel="nofollow">https://github.com/leaflabs/maple/blob/master/maple-r5/maple-r5-schematic.pdf</a></p> <p>From your posted picture, I assume that the fried part is the diode D2. I am not sure why that would fail though, unless there is something else wrong on the board "downstream".</p> <p>Can you power the board with a mini-USB cable and does it work doing that? That would mean the 5V regulation circuit has failed.<br /> Here is some more hardware info in the documentation:</p> <p><a href="http://leaflabs.com/docs/hardware/maple.html" rel="nofollow">http://leaflabs.com/docs/hardware/maple.html</a></p> <p>On a related note, since the voltage regulators on the Maple do not have a relatively low rated power dissipation, they cannot supply a lot of additional current. I am not sure if you had any other shields plugged in at the time.<br /> (<a href="http://leaflabs.com/docs/hardware/maple.html#maple-power-regulation" rel="nofollow">http://leaflabs.com/docs/hardware/maple.html#maple-power-regulation</a>)</p> <p>Hope that helps,<br /> Mike </p> http://forums.leaflabs.com/topic.php?id=9424#post-20788 Mon, 05 Nov 2012 11:20:38 +0000 Ksandr 20788@http://forums.leaflabs.com/ <p>Sorry, I make mistake with section of forum. </p> http://forums.leaflabs.com/topic.php?id=9424#post-20781 Mon, 05 Nov 2012 07:12:01 +0000 Ksandr 20781@http://forums.leaflabs.com/ <p>Hi, leaflabs,</p> <p>I bought your board about month ago.<br /> Yesterday I try to plug in external power supply (12V), I check polarity before, but my board fired and smoked.</p> <p>What I doing wrong?<br /> Photo:<br /> <a href="https://dl.dropbox.com/u/39913355/IMG_0032.JPG" rel="nofollow">https://dl.dropbox.com/u/39913355/IMG_0032.JPG</a></p> <p>Fired part near "ext" label.</p> <p>Can you tell me about how I can fix it?<br /> Can you send me sheme of a board, that I can try to fix it.</p> <p>Sorry for my english. </p>