[R-390] RE: HP 8640B

[David Wise]

> From: Laird Tom N [mailto:LairdThomasN at JohnDeere.com]
> 
>  Gene, If you can fix and align a R-390A, you can service a HP 8640B.
> Ebay has service manuals on CD for $12. They are modular in 
> design with
> mostly plug-in boards. Some boards even have idiot lights on them to
> tell you something is wrong. All boards are color coded for their
> sockets.
> 
> I love mine!

That CD probably contains the same manual you can
download for free from LOGSA.  I'm not criticizing
the CD, but you should know it may be redundant.
That manual is also for a fairly early serial number.
I sprung for a later paper one which cost a lot more
but was worth it to me.  Note that models equipped
with Option 004 require a different manual, also
available on LOGSA.  Option 004 models can be
distinguished by the appearance of the output
control.  Standard units have a single step
attenuator; 004's have two.

Dave Wise