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Here’s my story, Tek 485, a ham fest purchase, it was dirty and nonfunctional. It's a pretty common issue with ham fair test equipment. After cleanup of the 485, I found it had a shorted Tant in the

The following items have been added to the Files area of the [email protected] group. * /Tektronix TDS420_460 Schematics.pdf (

Files put into a single PDF and uploaded to the files section.

My 2465B suffers from a miss-tracking of focus with intensity. When the intensity is turned up (75 to 100%) I have to re-adjust focus. When I do this the readout is out of focus (because it is a lower

I have been working on getting the schematics for the TDS 420/460 converted from production engineering schematics to a form which can be used without trying to create a manual. I have no background

My caps were backwards as well. Looking at W140.com I see that they were added at SN 6040.

Hello Chris, I am afraid there is no reasonable way how to rewind the transformer. It is very small (just 3x3x3cm), has 6 independent windings and broken one is closest to the core. It is also

It's quite hard to believe that every 130LC was drawn and assembled incorrectly, and not picked up during what appears to be one ofTek's longest runs of production. I do recall a piece of Marconi

Replying by memory, I believe it is correct.? In most cases, if the fuse that blows is the .250 mA fuse, check the tantalum caps nearby. The culprit mostly will be the HV block. There was another

I don't recall for sure, but on my two 130s I think those caps were also reversed from the "proper" polarity, but it didn't seem to make much difference to operation. The net DC voltage on the meter

Hi, not what you want to hear, but have you considered re-winding it ? Either on the same or a similar former. If you're very lucky, the primary winding might be the outer one, or a separate former ?

Bad SMD? Not likely due to age. However, for the long term every board should be pulled (only one or two at a time) and inspected anyway, see. See

Bummer. It was worth trying. [email protected]> wrote:

Just checked, and it does not. Different ACQ board altogether. I have a 540, and it is similar to that. Makes sense, same series.

Same here, my caps were backwards. I also replaced a couple of the film caps there because they were DiFilm with high dielectric absorption which warped the low-scale reading. I found that polyester

There are many ways to approach it. You should be able to do this with a 7904 + 7B92A in delayed trigger mode. You'll need to display a complete frame with the main sweep and display the scan

The TDS520 component level service manual is available, not sure if it applies to the 420. Radu. [email protected]> wrote:

All SMD caps replaced, board cleaned and inspected, via's reflowed if showing corrosion signs. Still getting trigComparatorTest FAIL, ERROR ID 151 diagnostic test failure trigComparatorTest, TRIGA

When I first got this 7904 it has been stored unused for years. I turned it on and the scope, with some plug-ins, entered tick-mode. I spent months trying to figure out what was wrong to no avail. I

I read Alan Hampel's article on restoration of the above. He asserts that "Surprisingly, electrolytics C99 (5?F) and C100 (25?F), factory originals, were installed backwards! Not surprisingly,