beerbarrel wrote:

Picked up a HP 8640B for a song. When I powered it up, the counter
display was inop. After removing the cover, I noticed that the LED for
the 5V regulator card was not lit. I removed the card and found that
the fuse was blown. Well, needless to say, the new fuse blew
instantly. My question is this: Has anyone ever torn into one of these
that might have had this problem? I thought that I might ask before I
dug any deeper.

Thanks,
Tracy


the power transistor on the botton side comes loose! tighten the
screws, also check for bad caps. other than that if you got the
doubler option for 1 Ghz, you have something there.
its an easy thing to repair/