[time-nuts] Trimble 57963-80-DA1 assembly.. request for schematic

[EB4APL]

Hi Don,

While I don't have this model, I had a problem  with my Nortel-Trimble 
NTGS50AA with similar symptoms. This was caused by the way the 
interconnection between the two PC boards, they use a flat cable with 
unkeyed connectors on it so they could be reversed. Using one of the the 
straight ways, i.e. pin 1 to pin 1 and so on, the lights worked in a 
strange way.  Using the other way, the auxiliary board in front of the 
main one and the cable straight between them, it worked ok. I can send 
you a picture if you interested.

Regards & 73,

Ignacio EB4APL



El 20/06/2018 a las 13:46, donald collie escribió:
> Hi, I just received one ex-China GPSDO`s which uses the assembly mentioned
> above. It is nicely built, but has a design problem with the ACT
> [activity], and ALM [alarm] LED`s on the ancilliary pcb not following the
> LED`s on the Trimble pcb  - they don`t activate properly. Would one who
> knows please point me in the direction of the circuit of this assembly.
> Also, would somebody who has a GPSDO which uses this assembly, please
> confirm the correct led status when the crystal oscillator is correctly
> diciplined by the GPS, and "on frequency"
> Thankyou for your concideration of this!
> Cheers................................................Don Collie
>
>                                                   ZL4GX
>
>