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New to the group, lots of great info. My usually faithful 2445B led me
down the proverbial garden path 'cuz I failed to notice the vertical
voltage scale wasn't changing when I plugged in my 10X probe. Got
myself a service manual from Artec Manuals (inexpensive, and great
quality). To make a long story a bit longer, seeing that the probe
sense lines went straight to a ribbon cable, I popped/plugged the one on
the main board P511 and all was well.


Here's the question: As I am usually a "don't fix it if it ain't broke"
guy, does this vintage scope have problems with the ribbon cables? Mine
is wonderfully clean inside.


It was sure fun to open up the scope - brought back some memories. I
lugged a 453 around in my car back in the late 60s early 70s when I was
fixing IBM stuff. The Tek products were almost a nice inside as our IBM
stuff.... Except the 453 had a couple TUBES - OK they were really
little... but TUBES anyway. I quit hauling around the 453 when I went
to the Dark Side (software) in the mid 70s -


Pleasure to 'read' all you folks here. Thanks in advance for any tips.


Best wishes - or 73 for all you hams. Bill N2BC

On Thu, 7 Apr 2016 20:36:07 -0400, you wrote:

New to the group, lots of great info. My usually faithful 2445B led me
down the proverbial garden path 'cuz I failed to notice the vertical
voltage scale wasn't changing when I plugged in my 10X probe. Got
myself a service manual from Artec Manuals (inexpensive, and great
quality). To make a long story a bit longer, seeing that the probe
sense lines went straight to a ribbon cable, I popped/plugged the one on
the main board P511 and all was well.

That is a great diagnostic and repair job. Start with the easy
possibilities.

Here's the question: As I am usually a "don't fix it if it ain't broke"
guy, does this vintage scope have problems with the ribbon cables? Mine
is wonderfully clean inside.

That is usually the best advice; rough and unneeded maintenance has
the potential to cause damage and old instruments may be fragile
simply do to age. This is why I do not preemptively replace *all*
solid tantalum capacitors but instead only replace those which either
were not properly derated or are suspected of being unreliable.
Aluminum electrolytic capacitors are a different manner since they
have a limited operating life; I would rather replace most or all of
them at once rather than one at a time.

Is it possible that the ribbon cable connector worked loose? I have
seen temperature cycling cause these connectors to separate from their
pin headers if they are not captive. I would at least check to see if
any others are loose.