[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 5:00 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. Unfortunately…
>
> I then reinserted boards one by one to find the one that’s pulling the 15V down: it’s 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 that’s not the case: except for a 4 status LEDs, the display stays dark.  
>
> Does anyone know if that’s expected?  
>
> The 10 MHz detection board is not connected to the CPU bus, so the lack of it shouldn’t result in a bus hang.  
>
> Tom
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