[time-nuts] fluke.l monitor for Thunderbolt . . . the saga continues
Brooke Clarke
brooke at pacific.net
Wed Jul 6 21:11:30 UTC 2011
Hi Steve:
The last couple of board versions have a 3-terminal voltage regulator on
board. See the photos at:
http://www.prc68.com/I/ThunderBolt.shtml#8051PCB
Have Fun,
Brooke Clarke
http://www.PRC68.com
Steve wrote:
> Hi all,
>
> About a month ago I sought advice from list members regarding a
> dysfunctional fluke.l monitor for my Thunderbolt GPS receiver. Someone
> suggested that I contact Bob at fluke.l to see what he would do. I
> took that advice and thought some of you would be interested where I
> am now. Plus, I need some more advice :-)
>
> Communicating with Bob is a challenge due to my not knowing any
> Chinese and Bob having quite limited English language skills.
> Following a number of emails back and forth, Bob sent me a replacement
> microprocessor board.
>
> The layout of the replacement unit differs from the layout of the
> older microprocessor board. The lengths are about the same, but the
> replacement board is a bit more narrow than the older board. Further,
> the microprocessor chip on the replacement board is parallel to the
> short dimension of the board whereas that IC is parallel to the long
> dimension of the board on the older unit.
>
> Does anyone know if the replacement board with its different layout
> has the voltage problem I was seeing with the older board? The older
> board has the microprocessor VDD at about 5V. I understand that VDD
> should be about 3V and am wondering if the replacement board has
> corrected that problem?
>
> Is it as simple as removing the older, existing board and soldering
> the replacement unit in its place? Any tips as to how to most easily
> remove the existing board?
>
> Thanks.
>
> Steve
>
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