[Ham-Mac] Fwd: My New Digi Keyer Has A Problem

[Chris Smolinski]

Buzz out the two leads on the burned part, and tell me where they go 
(check to the USB connector and the FTDI chip). Is the part labeled? 
I can't see a silkscreen ref designator for it. Also, the transistor 
labeled 3V3, what type is it? I'm curious if they're using it to 
switch between the USB bus and an external power connector.

>Close up view:
>
>http://users.wildblue.net/k7on/charred2.jpg
>
>
>On Mar 19, 2007, at 1:22 PM, Chris Smolinski wrote:
>
>>Got a digital picture of the board showing the component? Might be 
>>difficult without a schematic, but maybe we can guess what it is. 
>>Perhaps something was drawing too much current?
>>
>>>Below is my email to MicroHam:
>>>
>>>Begin forwarded message:
>>>
>>>>From: Brian K. Short <k7on at wildblue.net>
>>>>Date: March 19, 2007 12:03:54 PM MST
>>>>To: support at microham.com
>>>>Subject: My New Digi Keyer Has A Problem
>>>>
>>>>I just hooked up my DigiKeyer to my FT-1000mp
>>>>using the supplied cables after configuring jumpers
>>>>as instructed.
>>>>
>>>>I saw a power light when I turned the radio on.
>>>>
>>>>I then connected the USB cable to my Mac and
>>>>enabled the interface in MacLoggerDX.  The
>>>>radio and computer were communicating.
>>>>
>>>>Shortly, smoke came out of the unit.  I unplugged
>>>>everything, but it looks like there is a charred
>>>>component in there near the USB connector.
>>>>
>>>>What do we do now?  I really want to use a Digi
>>>>Keyer?  But this one was evidently defective!
>>
>>--
>>
>>---
>>Chris Smolinski
>>Black Cat Systems
>>http://www.blackcatsystems.com
>>_______________________________________________
>>Ham-Mac mailing list
>>Ham-Mac at mailman.qth.net
>>http://mailman.qth.net/mailman/listinfo/ham-mac
>>
>--
>Brian --> http://users.wildblue.net/k7on/
>"Blessed are the cracked, for they shall let in the light."
>
>_______________________________________________
>Ham-Mac mailing list
>Ham-Mac at mailman.qth.net
>http://mailman.qth.net/mailman/listinfo/ham-mac


-- 

---
Chris Smolinski
Black Cat Systems
http://www.blackcatsystems.com