[time-nuts] Has my TBolt gone south ?

[Chris Waldrup]

I had an issue with mine and worked it out last night thanks to all of you great list members!! Thank you!!!!!!

Turned out to be a blown PNP SOT package transistor that feeds 5V to the antenna. 

Do you have 5V on the F connector?

I saw your Lady Heather screenshot said antenna ok, but this is just a thought. 

Mine was hanging at 1% self survey for days and after replacing the transistor and doing a factory reset it picked up all satellites and settled down to 0.04 ppb error. 

I'll post details of the transistors (there are 5) in the vicinity of U19. Thanks to Matthias Jelen for the help. 

On some models the transistors are on the other side of the board. The blown one on mine was marked C2N which is a Central Semiconductor CMPT404A and is carried by Mouser. It's listed as a PNP chopper transistor. 

I used an On Semiconductor MMBT3906 that I had in stock and it worked fine. 

The other four transistors are marked 5D, 1AM, 2A, and 2A. 

Good luck and I hope you are able to fix your unit. 




Chris

KD4PBJ



—
Sent from Mailbox

On Wed, Aug 12, 2015 at 9:02 PM, Bryan _ <bpl521 at outlook.com> wrote:

> I have had a similar issue occur. For some reason it all of a sudden wanted to do wanted to do a self survey but couldn't. Stuck at 1% on the survey. I switched to Tboltmonitor as my backup program and was able to re input my lat/long and altitude settings, saved and it carried on. Power glitch, firmware issue, who knows.
> p.s. I believe you need a minimum of three satellites to work through the standard or precision survey.
> -=Bryan=-
>> To: time-nuts at febo.com
>> From: hmurray at megapathdsl.net
>> Date: Wed, 12 Aug 2015 11:29:58 -0700
>> CC: hmurray at megapathdsl.net
>> Subject: Re: [time-nuts] Has my TBolt gone south ?
>> 
>> 
>> dibene at usa.net said:
>> > Today I switched on again my TBolt after a few weeks of power down. It looks
>> > like it has decided to take a period of rest, maybe definitive... 
>> 
>> How long did you wait after turning it on?
>> How good is your antenna position?
>> Did you tell it to remember the location after a survey finished?
>> 
>> If it's been off for a few weeks, it doesn't know where the satellites are.  
>> To get started, it has to find one by a brute force search.  With a good 
>> antenna, that doesn't take very long.  Then it takes 15 minutes to collect 
>> the satellite info.  With a poor antenna location, it takes longer, maybe a 
>> lot longer.
>> 
>> -- 
>> These are my opinions.  I hate spam.
>> 
>> 
>> 
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