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Unread 01-02-2012, 08:25
Unsung FIRST Hero
Al Skierkiewicz Al Skierkiewicz is offline
Broadcast Eng/Chief Robot Inspector
AKA: Big Al WFFA 2005
FRC #0111 (WildStang)
Team Role: Engineer
 
Join Date: Jun 2001
Rookie Year: 1996
Location: Wheeling, IL
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Re: Burnt jag but why...?

Can't wait to see the pics then. It is also likely that the defect was present and on it's way to catastrophic failure when you powered the robot. It was merely coincidental that you observed the result when you enabled. Was this in one of the new Jags? I haven't opened one of the new ones, but there really isn't much in the way of circuitry near the V+ terminal in the old ones. There is the 5 volt, three terminal regulator, that is towards the PWM connector and CAN Bus. Or you simply had what we call an 'infant mortality' failure of one of the FETs. This occurs when a device checks good, makes it through quality control testing but fails very early in it's life cycle.
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Good Luck All. Learn something new, everyday!
Al
WB9UVJ
www.wildstang.org
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Storming the Tower since 1996.