[time-nuts] Tbolt failure modes

Magnus Danielson magnus at rubidium.dyndns.org
Tue May 8 22:45:36 UTC 2012


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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