[time-nuts] fluke.l monitor for Thunderbolt . . . the saga continues

Steve steve65 at suddenlink.net
Wed Jul 6 22:56:45 UTC 2011


The replacement board looks like the one pictured on Brooke's web site. 
Same processor as the older board. Hope to get it installed this evening 
or tomorrow, I'll post the results.

Thanks all for the help.

Steve

On 7/6/2011 5:11 PM, Brooke Clarke wrote:
> 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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