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Gianni, You have produced another magnificent masterpiece worthy of these electronic works of art! I salute you, Sir! Best regards, Mike

Quick update: I've begun looking at the scope, and i have found that the + and - 15v rails are shorted, i'll keep looking at it and let you know what i find.

Gianni, You are truly amazing! You produced a stunningly beautiful draft while troubleshooting a completely foreign instrument. Thank you for the chance to examine your draft copy. I shall send a

Hi, I recently acquired a 7704A with a similar, if not identical issue. Since keeping it on for a long time was not a good idea, with scope in OFF state I measured resistance of all power supply

nooo, I am honored to be in touch with one of my heroes! ? Here you can find the drafts: http://www.k100.biz/ebooks/11302.pdf http://www.k100.biz/ebooks/11302lr.pdf (smaller file in lower

Good job! Of the failures I have had with 465M(1) and 465B(3), failed rectifiers seem to be the most common. Not that I have not had many others - main filter caps, shorted dipped tants, failed

I report success. Turned out to be a blown bridge rectifier, CR721, after all. Which is weird, because it tested ok when I pulled it the first time. I guess it was misbehaving under load, but

There are diodes in the d-c restorer circuits that will go bad causing the high brightness. Replace them with 1N4937. The two 22meg resistors should be replaced with Vishay VR37 types. The Z board

The A version still uses them on the switching PS boards as well as most, if not all, of the other boards. In my latest 7704A, I had one tantalum catch fire on the horizontal amplifier board while I

Well, that's both good and bad things showing. The good parts are that's probably why it was free, and the high voltage system is probably OK, leaving hopefully only minor, simple problem(s) like low

Lucky... Inability to control the intensity most likely indicates a problem with the Z-Axis circuitry. Note that the Z-Axis board depends on signals from the Logic Board so there are a few places to

Hi there, i recently found a free tektronix 7704A Oscilloscope, but unfortunately it isn't working properly. When i power it up the only thing that shows up is a very bright (so bright i suspect it

I will be honored with a copy. During the 1130x development, I was told that I had psychic debugging skill. It seems to work over a great distance too!

Thanks! Without your intuition about the intensity In would not succeed. Interesting: I thought that a strange behavior in the brightness control was a fault of my gear. I order the new EPROMs and

That is great news! I am happy that you were able to restore EA function and save another scope. If you are able to update the firmware to 3.1, you will find significant improvements. Version 2.7

I brought back from the farm my 7603 to see the physical items and layout involved, and also found I have a bunch of saved parts from junking a couple 7603s long ago. The R7613 transplant looks like

EVVIVA! (typycal Italian expression of great joy) I was closing the email below, when I remembered something I read in the 11302 Firmware Replacement Technical Bulletin that very kindly Hakan Hintze

It took 2 versions as I am learning CNC/CAD. jlcpcb. Way way cheaper then north american shops of course. There are issues in my design but - good enough for now.

That's awesome! Who did the CNC work? -- john, KE5FX

Thanks for your suggestions, I work on them and update.