[time-nuts] Tbolt failure modes

[Azelio Boriani]

No, it is an LT1021DCS8-5 5V precision voltage reference. Not a voltage
regulator, should be the refernce for the OCXO DAC.

On Wed, May 9, 2012 at 12:49 AM, Azelio Boriani <azelio.boriani at screen.it>wrote:

> 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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>
>