Unlike most of the scope, the HV section can quite easily catch itself on fire... This is because of its easy ability to sustain arcing. So, the beeswax, and old oil style capacitors,

I was doing some cleaning up in my shop and came across something from a Tektronix 454 scope that resonates with this transformer discussion. I think "contaminated" epoxy may have caused another

Albert, I hope so. Comparing my HV box with the pictures I saw, I am convinced that my 454 has been repaired at this level in the past. Diodes aren't the same series and different shape. Also

Albert, Thank you. Sorry, my move and idea was bad,I feel that when I saw the flashes. So I'm learning... now I need to find a new cap. I have in my "part box" some round capacitor capacitor but they

Hi. Has anyone had any success repairing these modules? I could find little to no information regarding the servicing of them. Richard

(continued) Those flashes after disconnecting C1460 indeed seem to indicate that C1460 was already bad.

Victor, Regrettably you don't now whether C1460 went bad because of those flashes or was already bad. You shouldn't see even the slightest sign of leakage, the cap is gone. A safer way to disconnect

Hi all: I am considering a project create a more convenient '1103' Tekprobe capability for augmenting common O'scopes compatibility with the Tekprobe BNC interface. My idea is to make compact

Edward, I have found that dirty/sticking switches are a major problem in these old scopes. I have had several 4XX Series scopes across the bench that were "Cured" by a simple and thorough cleaning

Toby, Thank you! I really like the TDS460A as it has some very useful features. I bought this one on E-Pay No Reserve Auction for less than $50 USD, including freight. It was listed as

John, Thanks for that information, I have precious little experience with these very complex TEKTRONIX SMPS's. That is confirmation of my suspicion as well. Since there was so much discussion by

Good idea. With beam finder pressed, it does not show the problem.This is an important clue! in xy mode it does glitch too, as every other setting. I have checked Z output and its clean. (it leaks

Albert,Thank you. I was looking for some information regarding the HV transformer terminals and during the search I read a post from a member that repair the HV circuit after found that C1460 has

Michael, In some Tek power supplies, I have observed that a degrading opto-coupler demands more and more current from a TL431A, eventually causing the TL431A to fail. --John Gord

Fantastic! As a fellow TDS 460A owner, I am quite impressed and pleased you got it going again. Once again the list collects an important repair story for posterity... --Toby >

After 6 months of on and off searching, I may have found the issue with my SMPS for my TDS460A. No schematics are available, so it comes down to trying to understand what goes on in one of these

It might be bought for a reasonable price except for shipping. Bob

Edward, I am going to ask what may seem a stupid question. Have you cleaned the "Beam Finder" switch? I have a 465 that was doing something similar. It had a dirty beam finder switch. The switch

Roger that, Roger!  At least somebody is on the ball these days.Thanks for the correction. JimSent from my Verizon, Samsung Galaxy smartphone

My new to me 466 2nd version has a strange issue. I see a background image related to the display. Hard to describe so there is a picture in photos under Edward Prest. It may be a blanking issue or a