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 <[email protected]>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 < > [email protected]> wrote: > >> On 05/09/2012 12:33 AM, [email protected] 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 >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
