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:[email protected]] On Behalf Of Matthias Jelen
Sent: Monday, June 08, 2015 9:28 AM
To: [email protected]; [email protected]
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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