This is a plain vanilla 2465, no A or B. The A5 display board (and the
entire scope) is all
through hole construction. So it doesn't have
those leaky SMD
tantalums. Not saying
there aren't bad caps somewhere,
but at least they shouldn't spew out
corrosive electrolyte
all over the
board.
Also, this has an EAROM chip instead of the Dallas NVRAM. Sure
would
like to know why
they switched to the Dallas part in later
scopes, was the EAROM unreliable?
I purchased this essentially as a
parts scope for my *other* 2465, which
works
wonderfully.
Unfortunately, this scope works well enough that I'm feeling
motivated
to repair it
instead of using it for parts
:-)
Scott
On 12/31/2012 9:06 AM, Ed Breya wrote:
> If the
scope is a 2465B, this may be a symptom of a well-known problem with leaky SMT
electrolytic caps on the display board, as I recall. This issue comes up quite
often - in fact, when I first joined the group, I noticed such a discussion
and got concerned about my 2465B, so I started asking about it. Thanks to the
group, I found that mine did indeed have the problem, and I managed to fix it
before any serious damage was done. If not for that, it would have been
damaged eventually, since this is my "best scope" that sits on the shelf -
reserved for when all the others have crapped out. I would have never known
until the time came to use it.
>
> The other long-term
deterioration issue is the battery-backed RAM for the calibration constants -
mine is OK for now, but I still haven't resolved a "permanent" solution. This
issue also comes up regularly.
>
> Ed
>
> --- In TekScopes@...,
"Scott Burris" wrote:
>>
Hi,
>>
>> I'm hoping for a hint in the right direction on
two problems
>> I'm trying to solve on a Tek 2465 scope. I've already
done the
>> power supply tests in Table 5-1 of the service manual
and
>> all voltages seem to be in tolerance, including
ripple.
>>
>> Problem #1: One of the cursors can only be
adjusted over the left
>> 1/3rd of the screen. It can go all the way
to the left, but when
>> adjusting it to the right, it gets "stuck"
about part way over.
>> However, the on screen readout, measuring
frequency, continues
>> to change as the knob is turned. If you turn
the knob in the
>> opposite direction, eventually the cursor become
"unstuck" and
>> can be returned to the left side of the
screen.
>>
>> Problem #2: The on-screen readouts can't be
brought into focus
>> at the same time. Turning the focus control, I
can bring either
>> the upper readout or the lower readout into
focus, but then the
>> other is slightly fuzzy. I tried tweaking the
astigmatism control,
>> but no luck in getting this to
improve.
>>
>> Do these problems ring a bell with anyone?
Otherwise the scope
>> seems to be working
fine.
>>
>> Although the power supplies seem to be OK,
should I recap them
>> as a proactive measure? Presumably this won't
help my two
>> problems. I'm aware of the condoraudio.com document
for a
>> 2465B. Is there a list of caps to order and replace for a
2465?
>> If not, I guess I could make one up and publish
it.
>>
>> I'm tempted to thermal epoxy a small heatsink on
U800 for good
>> measure. Any downsides to doing that? Mine seems to
be a Tek
>> made part, not a Maxim, does that improve heat
reliability?
>>
>> Thanks!
>>
>>
Scott
>>
>
>
>
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