Hey David,
The 50 ohm terminator is on the ceramic hybrid in the attenuator. It might
have been burned by applying too much power, but it's also possible that
you have an oxidized relay contact. There is overload protection for the
terminator, so it would have had to be a pretty gross overload to burn it.
These attenuators are fairly serviceable, I took some photos of mine from
my 2430:
/g/TekScopes/album?id=12814. Here's the ceramic
substrate:
/g/TekScopes/photo/12814/163755. I believe the
50Ohm resistor is the big black film on the top left - you can see that
it's been laser trimmed by the cuts on both sides of the film.
Siggi
On Sat, May 11, 2024 at 12:19?PM david via groups.io <davide_us=
[email protected]> wrote:
Hey guys, I bought another 2465 for parts, only 100 bucks. Have two 2465's
already but couldn't stop myself from buying it. Channel Two 50 ohm DC
Input is not working correctly. Can hear relay click, LED lights up, but
input remains at 1Meg ohm. Can anyone save me some time and point me in the
right direction? Where is the 50 ohm load located? I put new electrolytics
in power supply, and new power switch. All voltage's good, scope is working
fine except for the Channel Two 50 ohm dc input. If I use a 50 ohm
termination on the bnc cable Time markers are correct.
David
