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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