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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