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John, I don't have any direct experience of the Tek 468 or the 8085 processor that it uses but I am fairly familiar with some of the other 8 bit micros, so this is gleaned from the 8085 manual: If

Hmm. There's no single component that's used only on that setting. 0.5ms/div, 0.2, and 0.1 all use C160G/M, while all 5's from 50us/div to 0.5s/div use R160F, all 2's use R160E, and all 1's use R160D.

BTW, I should also mention that all the pins on the two ICs that I removed were very tarnished. I tried cleaning (very carefully since they seemed rather fragile) with both IPA and Servisol switch

Roger, that's a kind offer which I may take you up on. I will e-mail to ask particulars. However, first, here are the results of the test procedure on page 330: All voltages are within normal

Weird. Yeah, if I go online I have to click on "view quoted text" to see what you wrote... For some reason, your emails to the list appear as quoted text.

John, Since you are in the UK, I can offer to program a couple of 28C64s for you, please e-mail me (rdot gdot evans at talk21 dotcom). There are ','s between my initials. If you would find having a

Roger, thanks for the reference to KO4BB.com site and references to the manual pages. I will check that out and report back.

Miguel, thanks. This is what I suspected. I think unless anyone has a better suggestion I might buy one of these anyway but with all the cables, adapters and bits:

Page 328 of the Tek 468 Service Manual at KO4BB .com (linked to from Tek Wiki) shows how to isolate the analogue and digital portions of a 468 to verify that the analogue section works correctly

No, this programmer is for atmel AVR ony Where are you located? https://www.youtube.com/watch?v=Gdmsni8cGvY If can program eeproms for you -----Mensaje original----- De: [email protected]

Thank you for the pointer to the TekWiki resource. I have found and downloaded the two ROM files. I do have an AVR programmer and a ZIF socket board that can take up to a 40pin DIL chip but I'm not

I second that, especially since at 0.5 cm/div the high value 5 M of R160 is switched in. The cap voltage increases when the sweep goes further to the right.. Any leakage then causes nonlinearity.

I now have it working properly, but still don’t know what the original problem was. Maybe resocketing transistors and the CRT did some good. The Y output amplifier was bad, but I found a new one on

I believe the ROM images are on Tekwiki, I think that is where I got them when I needed them. You will most likely have trouble finding an original 24 pin Eprom, but I used (as i understand most do)

That symptom could be caused by a leaky timing cap for that sweep setting. If it starts off at about the correct speed on the left, but slows down as it moves to the right (e.g., square waves get

Hi all, Some of you may recall the 585A I got earlier this year that had a short. I was able to get it up and running. Ended up replacing a pair of totally short diodes in the power supply with new

Thank you for the part numbers and checksums for the ROMs. Unfortunately I do not have an EEPROM programmer so am unable to verify the checksums or program new ones. I would need a bit of help

John, I have a 468 as well but have not used it in a very very long time. Unless a near impossible part to find part has burned out it should be repairable. Since this is a processor controlled scope,

I recently acquired a Tektronix 468. When powered up (with digital mode turned off) it will occasionally display a good trace but usually there is no horizontal sweep. The time-base is working but the