Good luck,
the RIFA caps are worth replacing, especially if you're in 240V land. Make
sure you replace them with properly specified X or Y class capacitors, as
required. You can find plenty of info about what that means on the
interwebs, but I wouldn't buy those from any but reputable sources.
Those old scopes are a work of art, and the service manuals are an
education - you're in for a treat :).
Good luck,
Siggi
toggle quoted message
Show quoted text
On Fri, Apr 26, 2019 at 12:34 PM Tony Fleming <czecht@...> wrote:
Thank you very much for comprehensive email, that is pointing me to the
right direction!
It seems to me that the Beam Switch is sticking for sure and could cause
most of my problems.
I'll try to update the videos as soon as I make some progress.
Should I also replace some of the square caps that are something like
0.006xx nF? Many people do this ASAP, since these caps are not a good
quality - despite most of the parts are very good quality.
Where should I buy the caps and other parts, if I'll need them?
I'm sure, China and eBay should not be on my list for caps - right?
Anyway, Have a great day and I'll post videos so you can see what I did and
the results that happen.
Have a great day and weekend!
Tony
On Fri, Apr 26, 2019 at 9:05 AM Siggi <siggi@...> wrote:
Hey Tony,
welcome to the group. I watched the videos you posted in another thread
detailing your 2465 CTS troubles <
>.
Here's my advice for how to proceed:
1. Get a service manual for your scope. You can download one from
here <
>, or if you're not satisfied with
the
scan quality you can buy a very good quality scan from Artek Manuals <
>.
2. Get familiar with the controls of your scope. Alan Wolke has a
bunch
of tutorial-like videos on coupling and trigger setup and such,
there's
a
list of his YouTube videos here <
>.
3. Read this document <
>
on
how to troubleshoot oscilloscopes.
Now looking through your videos, I think you one problem for sure, and
possibly one more.
1. Your beam finder button sticks or glitches.
2. Something else, possibly more than one other problem.
It's very hard to reason about what the CRT is displaying while the beam
finder is bad, but it's easy to fix. You can probably get by with
isopropyl
alcohol - just squirt some into the switch and work it several times. If
that doesn't do it, get yourself some kind of contact cleaner (Deoxit D5
is
what I use), and clean the switch with that.
What makes me think that you may have a second problem is the fact that
the
readout would sometimes shrink only in the horizontal, but it's possible
that this is simply due to a high-resistance beam finder switch, so fix
that first.
Once the beam finder switch is good, it's possible to move forward to
diagnose whatever else is wrong, if anything. A key question I found
myself
asking while watching your videos was whether the intermittent shrinking
affects only the readout, or whether it also affects the traces.
Unfortunately I didn't see the shrinkage occur while traces and readout
were both displayed.
Note that for the traces to be displayed, your triggering controls have
to
be set up right. If you set the trigger to AUTO & CH1, then set the CH1
coupling switch to GND coupling, you should be able to display all traces
reliably.
Siggi
On Fri, Apr 26, 2019 at 1:12 AM Tony Fleming <czecht@...> wrote:
I have the same oscilloscope. It is also listed under (at least that is
what I found today) as Tektronix 2465CTS (or 2465 CTS) .
Mine has some problems, sometimes I loose the text on top and bottom of
the display and also the FIND BEAM gets stuck, so I don't know exactly
where to find the solution.
Anyway, I hope your scope is working.
Tony Fleming
