[time-nuts] HP5370 Error 04

John Allen john at pcsupportsolutions.com
Tue Jun 9 22:50:29 EDT 2015


Hi Matthias - It sounds like you may have a temperature sensitive component (or solder joint?).

Perhaps cooling each component individually will help you find the problem.

Regards, John K1AE

-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Matthias Jelen
Sent: Tuesday, June 09, 2015 2:31 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP5370 Error 04

Hello John,

thanks for that information. Unfortunately, my fan is 
working. Opening the lid and putting an extra blower to cool 
the VCO helps to extend the time until he error occurs...

Regards,

Matthias

> Hello Matthias - I had this problem on my 5370B - it turned out that the fan wasn't running, which resulted in overheating.
>
> I hope this helps.
>
> Regards, John K1AE
>
> -----Original Message-----
> From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Matthias Jelen
> Sent: Monday, June 08, 2015 9:28 AM
> To: time-nuts at febo.com; dk4yj at gmx.de
> Subject: [time-nuts] HP5370 Error 04
>
>
> Hello!
>   
> I´ve got a question to the 5370 experts on the list.
>   
> I just received my new (old...) HP5370a. It performed fine for abt. one hour, then it started to display error 04 which means "PLL out of lock".
>   
> A look in the service manual revealed that there are several reasons for this. I checked the VCO voltage on both interpolator cards, and indeed, one of them is out of the specified -6V..-3V, it runs to the rail (-12V). Even if the error is not there, the voltage is at abt. -7 V, so I guess it´s just on the edge. The other card is fine.
>   
> Normally, I´d try the alignment procedure, but I´m missing the exotic HP pulse generator used for the alignment and I have no clue how I could easily substitute this one.
>   
> Did anyone encounter this problem before? Is there a cure for this problem known to the experts? Any hints are highly appreciated...
>   
> Thanks a lot,
>   
> Matthias, DK4YJ
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