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From memory of that far back. Those Tantalex caps, I believe are "Wet" tantalum types. Personally, I've not known one to fail, unless grossly over-voltaged!? But there is always a first time. The

Dear Chuck, Thank you very much for your support. After spending hours trying to figure out why the scope had all sort of "strange behaviors and displays", I decided to replace the HV board. I have

Hi all, (please note supporting pictures for the below at /g/TekScopes2/album?id=278771 ) I am starting work on this SG502, so its condition is virtually unknown, but during the

Radu Bogdan Dicher <vondicher@...> added the album SG 502 Repair ( /g/TekScopes2/album?id=278771 )

There are a few variants of the power supply, some have less pins on one of the output connectors (So each power connector is the same size) depending on scope model, and there are other versions with

Rogerio, So, are you saying that when you adjust the GRID BIAS pot on the HV board, you cannot make the spot go away? If that is what you are saying, start there. As to the voltage on pin 7 of U1956B,

Thank you for your reply Chuck. I will check the A5 board, although, as I said it has NOT any SMD capacitor. Also, would you please comment on the voltage at U1956B? I guess now the scope has two

Excellent! Thanks! I'll post progress/findings later. Reinhard

The 2465B is entirely fly by wire... That is, the controls on the front panel are read by an ADC, processed by the CPU on the A5 board, and used to program a sample and hold gate with the DC value

Hi, you can check video of Jared repairing such power supply. As he mentioned TDS500/600/700 have similar power supplies. It also includes information about external dummy load construction with all

Another observation: The scope is capable of displaying a signal that is aplied to any of the channels. The gain and sweep time seems to be working. However, I can not change the position of teh

On the subject of absorbing moisture, only in relation to CTVs, my experience of Grundig colour TVs from the early all solid state era was thus. The line output transformers NEVER failed, but the (so

It could be that a manufacturing defect existed in the wire, windings, connection points that over time overheated and thinned a section of wire so that it is now a higher resistance. Just a wag.

Les, Excellent!? You are right .? My use of? the term "Short" is not the best choice of words with regards to this symptom.? Since the winding has higher resistance than expected, it certainly is

Thank you for your reply Chuck. As I have mentioned in my post, all the voltages present in J119 are spot on, according to table 5-1 and my A5 board does not have the smd leaky capacitors. But when I

Rogerio O <rodd414@...> added the album 2465B strange display ( /g/TekScopes2/album?id=278726 ) : The horizontal dotted liea are not affected by INTENSITY, but the do respond to

You think you have a shorted turn, yet also think resistance is too high. Unless serious internal burning, the two suggestions are incompatible. I don't know this particular transformer, but HV

There is no visible sign of damage.? But there was only about 31VDC at the HV Test point.? This power supply is buried and not at all easy to test.? I checked every component on the board and found

The power supply in my TDS684A has decided to go into hiccup mode. Researching the topic, I keep finding schematics and advice only for the TDS520 and similar. Does anyone have or know where I can

Thinking about how this could happen, is there a short in the winding, and that would be between the center tap (beginning to centertap ok) and the end of the winding? Harvey