[time-nuts] Re: 5370A repair
guido.devries
guido.devries at kpnplanet.nl
Thu Jul 17 19:37:09 UTC 2025
Hi Tom,
The A8 Reference buffer also feeds the 10MHz clock for A9/processor board. I would first check A8, C17 and C18.
Regards Guido
>
> On 17 jul 2025 at 18:38, Tom Verbeure via time-nuts <time-nuts at lists.febo.com> wrote:
>
>
>
>
> > On Jul 15, 2025, at 5:00â¯PM, Magnus Danielson via time-nuts <time-nuts at lists.febo.com> wrote:
> >
> > Hi,
> >>
> >> Service powersupply. Should be relatively trivial.
>
> I removed all the boards except the power supply controller and the 15V was now present. Unfortunatelyâ¦
>
> I then reinserted boards one by one to find the one thatâs pulling the 15V down: itâs the 10MHz detector board that sits next to the OCXO power supply board. All other boards are plugged in.
>
> I would expect that with only this board removed, the CPU should be up and running and maybe displaying an error message? But thatâs not the case: except for a 4 status LEDs, the display stays dark.
>
> Does anyone know if thatâs expected?
>
> The 10 MHz detection board is not connected to the CPU bus, so the lack of it shouldnât result in a bus hang.
>
> Tom
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