[time-nuts] Tbolt failure modes
J. L. Trantham
jltran at att.net
Wed May 9 12:40:48 UTC 2012
I would suspect the problem is there or 'up stream'.
If it is not being exercised, it's going to be cold. If it's dead, it's
going to be cold.
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of bg at lysator.liu.se
Sent: Tuesday, May 08, 2012 5:33 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Tbolt failure modes
> On 05/08/2012 11:58 PM, Bob Camp wrote:
>> 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.
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.
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