[time-nuts] (no subject)

Robert Benward rbenward at verizon.net
Sun Jun 20 12:23:17 EDT 2010


Hi Joe,
I may have no alternative.  I have the manuals, I'll start taking it apart! 
I am very comfortable with small components, it's repairing oscillators I 
have the problem with.  But I'll give it a try.  Schematics for the osc and 
main board, and board layout for the main board, are available for E1938

Bob

  ----- Original Message ----- 
  From: J. L. Trantham
  To: 'Discussion of precise time and frequency measurement'
  Sent: Sunday, June 20, 2010 11:06 AM
  Subject: Re: [time-nuts] (no subject)


  Bob,

  I do not know about the E1938A but I have repaired 10811's utilizing the
  excellent troubleshooting section of the 10811 manual.  If you are an EE 
and
  are comfortable with small components, the 10811 should be no problem.

  I do not know of a similar manual for the E1938A.

  Joe

  -----Original Message-----
  From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
  Behalf Of Robert Benward
  Sent: Sunday, June 20, 2010 8:53 AM
  To: Discussion of precise time and frequency measurement
  Subject: Re: [time-nuts] (no subject)


  Steve,
  I was looking for insight.  For instance, is there a power up sequence for
  the +5 & +12V?  Anything I can look at before I dive in to the can?

  This is not the first HP oscillator I have that has gone dead on me.  I 
have

  a 10811 that went south on me a few years back.  This is just getting
  expensive to replace them when they go bad.

  And yes, if there is someone out there that can do it, I would consider
  sending it out for repair.  I'm an electrical engineer, but I also know my
  limitations, and although it would grate at me to send it out for repair, 
it

  would be the right thing to do (if the price is right)

  Bob


    ----- Original Message ----- 
    From: Steve Rooke
    To: Discussion of precise time and frequency measurement
    Sent: Sunday, June 20, 2010 1:03 AM
    Subject: Re: [time-nuts] (no subject)


    Well, if your not prepared to open it up to fix it yourself, are you
    looking for someone else to fix it for you (your postings need
    clarifying)?

    Steve

    On 20 June 2010 16:23, Robert Benward <rbenward at verizon.net> wrote:
    > Adrian,
    > I have all this stuff. I really don't want to open this thing up, and 
my
    > oscillator trouble shooting skills are not that great.
    >
    > Bob
    >
    >
    > ----- Original Message -----
    > From: Adrian
    > To: Discussion of precise time and frequency measurement
    > Sent: Saturday, June 19, 2010 11:10 PM
    > Subject: Re: [time-nuts] (no subject)
    >
    >
    > Bob,
    >
    > guess you know that detailed documentaion is available here:
    > http://www.prc68.com/I/HPE1938.shtml
    > http://www.leapsecond.com/museum/e1938a/
    > Open the can and report back!
    >
    > Adrian
    >
    >
    > Robert Benward schrieb:
    > > All,
    > > Anybody out there know how to fix an E1938 oscillator? Something in
  the
    > > metal can has crapped out. No 10MHz, and in turn, no processor 
action.
    > It
    > > worked a few months ago, turn it on today, and worked after about an
    > hour.
    > > Turned it on again this evening and nothing. I would hate to take 
that
    > > crystal/heater assembly apart.
    > >
    > > Bob
    > > _______________________________________________
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    > >
    >
    >
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    -- 
    Steve Rooke - ZL3TUV & G8KVD
    The only reason for time is so that everything doesn't happen at once.
    - Einstein

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