[time-nuts] Tbolt failure modes

Azelio Boriani azelio.boriani at screen.it
Tue May 8 22:49:20 UTC 2012


Here in Europe the time now is late night, anyway there is also U15: a
LinearTechnolgy LT2105 or LTC2105 but I can't find nothing... maybe it a
marking code and not the actual part number. Maybe a linear regulator,
google says LT2105-5.0 but on the Linear site it doesn't exist.

On Wed, May 9, 2012 at 12:45 AM, Magnus Danielson <
magnus at rubidium.dyndns.org> wrote:

> On 05/09/2012 12:33 AM, bg at lysator.liu.se wrote:
>
>> Hi Magnus,
>>
>>  On 05/08/2012 11:58 PM, Bob Camp wrote:
>>>
>>>> Hi
>>>>
>>>> The first thing to check is the soldering job on the DB-9 connector.
>>>> Second thing to check is the RS-232 level translator IC. (RS-232 in
>>>> should create TTL etc)
>>>>
>>>
>>> Does not explain why the OCXO remains stuck as if it was untrained.
>>>
>>> I suspect that the CPU never starts or hangs early.
>>>
>>> Cheers,
>>> Magnus
>>>
>>
>> The big Trimble IC (U2) close to the RS232 port, is also noticeable colder
>> to a finger tip on the faulty unit, compared to a working unit.
>>
>
> OK. As Azelio proposes, check the 3,6864 MHz clock.
>
> If you can find the reset pin, then that too.
>
> Cheers,
> Magnus
>
>
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