Only Channels 1 and 2 exhibit vertical linearity issues.? This is re-assuring for the CRT.? Since its only Channels 1 & 2 but its both channels in the same way, I suspect its a circuit problem and not likely the U400.? Keep in mind that bad supply rails can cause vertical distortion AND less sharp traces.? Its unusual for these scopes to have good supply rails after 20+ years.? Nearly all require re-capping the power supply and the A5 board as a minimum.
Overall, the frame seems twisted about 1/8" or more (doesn't sit flat on the bench). It's probably not too difficult to straighten this out.
This is the reason for my concern about being dropped.? This case is very sturdy, meant to be a portable scope.? I cant imagine how to distort the case with a normal blow.? I have an older rack mounted 2465 that was dropped hard, broke the CRT (at the neck, near the rear pins) and bent the screws holding it to the rack.? But the frame is still straight.
As for the broken fanI have never owned?a 2400 series scope that didn't come with some kind of fan issue.? Yours seems minor compared to others.?
BTW, as I mentioned, this appears to be a 1994 manufacture date and a 65k serial number. Was this pretty close to the end of production?I have not found documentation of serial numbers vs manufacture date.? But its clear that higher numbers means later manufacture dates.? Also, Bxxxxxx numbers were manufactured in Beaverton Oregon, while others were assembled elsewhere (eg UK).? There seemed to be many changes after serial numbers B050000, especially in the A5 board.??But I don't know if that is before 1990s or not.? I used 2465, 2465A, and 2465B from the early 80's until my retirement in 1999.? I never cared about manufacture dates, only calibration?status/date.? They are fine analog scopes.
From: "Barry n4buq@... [TekScopes]" <TekScopes@...>
To: TekScopes@...
Sent: Wednesday, March 30, 2016 8:11 AM
Subject: Re: [TekScopes] Re: 2465B U400 Availability?
? Only Channels 1 and 2 exhibit vertical linearity issues. Channels 3 and 4 appear to be okay. It won't be a big deal to swap U400 with my 2445 to see if it fixes the problem.
I do notice the trace is not as sharp as I'd like/expect (my 2445 shows a bit crisper and I think they use the same CRT), so not sure if there's internal damage or just needs adjusting.
There's a slight dent in the bottom rear of the cabinet and I think I can tell a small distortion in one of the frame pieces that meets up with the rear panel but the direction of that distortion seems odd (e.g. it would indicate an outward force rather than an inward force such as a strike to the rear panel, etc.). No telling just what/how it was hit. Overall, the frame seems twisted about 1/8" or more (doesn't sit flat on the bench). It's probably not too difficult to straighten this out.
As for the broken fan, the way the fan "shroud" is designed, it presses against the center of the fan motor and it wouldn't really take very much pressure (with the cabinet removed) to break the small plastic supports that center the motor in the frame. I plan to CA glue those back in and see how that holds up. If not, a replacement appears pretty easy to find. The fan is slightly noisier than the other style fan in my 2445. I wish it had the same style fan in this model.
BTW, as I mentioned, this appears to be a 1994 manufacture date and a 65k serial number. Was this pretty close to the end of production? I've looked for serial number correlation but not finding too much on that for this model. TekWiki just says "Produced from 1984 to ?".
Thanks,
Barry - N4BUQ
----- Original Message -----
From: "machine guy machineguy59@... [TekScopes]" <TekScopes@...>
To: TekScopes@...
Sent: Tuesday, March 29, 2016 11:00:38 PM
Subject: Re: [TekScopes] Re: 2465B U400 Availability?
Its troubling that the scope ma have been dropped so hard.? Double check the
CRT.? If all channels show similar distortion you may have a CRT fault.? Its
repairable though.
From: "Barry n4buq@... [TekScopes]" <TekScopes@...>
To: TekScopes@...
Sent: Tuesday, March 29, 2016 9:47 PM
Subject: Re: [TekScopes] Re: 2465B U400 Availability?
? Got a chance to open up the 2465B tonight. Pretty clean and no obvious
? signs of capacitor issues (leakage, etc.). It's a 65K serial number and
? appears to have been made in 1994.
Fan is broken. Two of the three spokes that hold the motor are broken and the
blades were stuck against the back of the main frame. I managed to push
those in place well enough to hold and the fan now runs; however, no telling
how long it ran without that so heat damage could be a factor. Not sure, but
the scope might have taken a small hit - enough to break that fan and cause
the entire frame to be twisted just a tad.
Reseated U400 just for fun but didn't cure the problem.
Need to check voltages and ripple and possibly reseat some connectors as the
controls and CRT seem to be intermittent with some apparent noise here and
there.
Also will want to try swapping U400 with my 2445 to see how much that cures.
Neat scope!
Thanks,
Barry - N4BUQ
----- Original Message -----
From: "Barry n4buq@... [TekScopes]" <TekScopes@...>
To: TekScopes@...
Sent: Tuesday, March 29, 2016 2:22:39 PM
Subject: [TekScopes] Re: 2465B U400 Availability?
I bought the 2465B today. Nice physical condition on the outside but
haven't
had time to open it yet.
Seems there's a bit of noise on some channels. I'm guessing power supply
issues.
Changing the vertical position of the trace definitely changes the height
of
the trace as I move from bottom to top. Looks like U400 is indeed
problematic.
Will know more once I dig into it.
Thanks,
Barry - N4BUQ
I'm looking at buying a 2465B that's supposedly needs a U400. Scope
appears
to work somewhat (calibrator trace looks good, etc.) and price is good.
I'm wondering what I may be getting into here. Are U400's very hard to
find
at a reasonable price? I see them on eBay but wondered if there's a
better
source (perhaps here?) for them.
Also, is it "normal" for the 2465B to display any trace (e.g. the
calibrator)
when U400 is bad? In other words, I'm wondering if U400 is really the
problem with it or possibly something else (apparently it won't
calibrate).
NVRAM maybe?
Thanks,
Barry - N4BUQ
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