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| Test Equipment Anonymous (TEA) group therapy thread |
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| mnementh:
--- Quote from: factory on July 02, 2022, 07:48:19 pm --- --- Quote from: factory on July 02, 2022, 06:03:05 pm --- --- Quote from: mnementh on July 02, 2022, 05:34:01 pm --- --- Quote from: factory on July 02, 2022, 05:11:47 pm --- --- Quote from: m k on July 02, 2022, 04:24:57 pm --- --- Quote from: mnementh on July 02, 2022, 04:08:13 pm --- --- Quote from: factory on July 02, 2022, 02:05:50 pm --- --- Quote from: mnementh on July 02, 2022, 03:05:23 am ---Uggghhh... Okies... anybody got any tech ref on the monitors used in these HP scopes? I understand the difference between the two implementations is the 54621D and family use 32-grayscale palette, while the 54600A and family use a 2-grayscale palette. 54645A/54600A use HP 2090-0316/DataRay CDM-7SF191, the 54621D uses HP 2090-0384/DataRay CDM-7SX191. My searches in the available HP SMs and on the internet turned up bupkis. Before I go guessing based on poking around with my scope, does anybody here have actual pinouts and or schematic for these monitors? Tomorrow I figured I'd start looking at the CLIP package from the 54645A and see what I can find there. Maybe lookit the video chip on each and see if I can find some datasheets. :-// mnem :=\ --- End quote --- I'm would be surprized if they aren't interchangeable, they look to be standard bought-in monochrome monitors to me, the different greyscaling would be something done in the video processing, on the mainboard and the output just a video signal. Certainly I saw the video signal on the diagrams for the 54645A, that was posted a few weeks back. I think the other connections are power (+15V?), an external pot for brightness, can't remember what else there is. The chip on the Hitachi CDM-7SF191 board in my 54615B is a uPC1379C, this is a sync signal processor IC intended for small B/W & color TVs and does the vertical & horizontal stuff, that is done by more discrete parts on the earlier scope displays (the only one that a diagram seems available for).David --- End quote --- Yeeah, I'm not sure. IIRC, these are actually a TTL digital input monitor, so not that simple. I need to do some research. :-+ mnem :-/O --- End quote --- Neck board has an added 74S03, so maybe 16 new shades of gray. CNC industry have had small screens for quite some time. Possibly already have an almost ready replacement LCD. --- End quote --- The 7403 is on the CDM-7SF191 in the 54645A/54600A/54615B, the newer CDM-7SX191 looks to use one or two transistors instead. The larger monitor boards both look to use a similar signal processor IC, layout has changed a bit, need to find better pictures. The boards in my CDM-7SF191 from 54615B, taken before the re-capicide. Pictures of CDM-7SX191 from ePay listing. David --- End quote --- Oooh... good idea, looking on fleaBay for pics rather than beating my head against nonexistent documentation. :-+ I've done this before; no idea why I didn't just start there. :-// So possibly the difference is just support for the uPC1379C. VCC/GND are the same pins; I need to trace out the circuits for the BRIGHTNESS pot and see where they are in the pinout. mnem :-/O --- End quote --- I missed a word out, they both look to use a similar IC on the larger CRT board, just we need better pictures of the newer 7SX version to confirm if it is the same IC. I can't find any teardowns showing this, hopefully someone on here can provide some pictures. ;) David --- End quote --- From the Agilent 54654N diagrams, that were linked to recently. The monitor cable has three connections for +15V and ground, six total. Three connections for the intensity pot. Last four connections are half bright, full bright, HS (Hsync?) and VS (Vsync?). Interesting the HS goes through a 74393 to provide the probe compensation signal. HS & VS come from the big Jackal custom IC and the half bright, full bright from a PAL IC. Other relevant pages have been cropped, rotated & added below. This forum post suggest the Hsync is 19.72kHz and the Vsync is 60Hz. https://www-elektronik-si.translate.goog/phpBB2/viewtopic.php?t=30373&postdays=0&postorder=asc&start=30&sid=c8ec2c01726d6cc1ee123fe5ebbe8c3d&_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-US&_x_tr_pto=wapp Guess I need to locate those on my 54615B, to try & narrow down where my intermittent horizontal roll problem is, but it's not the same board. David --- End quote --- Awww, man, you ruined all my nerdly fun! That was just what I was searching out, but kept getting distracted by the Discord... now it's all right in front of me! :-DD mnem *scribble-scribble* |
| mansaxel:
--- Quote from: Specmaster on July 02, 2022, 05:08:58 pm --- Well, it's a real shame you didn't make that clear from the start :palm: --- End quote --- He did. |
| Specmaster:
--- Quote from: tggzzz on July 02, 2022, 08:23:32 pm --- --- Quote from: Peter_O on July 02, 2022, 06:30:03 pm ---I will not drive to Berlin Steglitz, no I will not :scared: https://www.ebay-kleinanzeigen.de/s-anzeige/hewlett-packard-kepco-uher-etc-/2146996418-168-3415 --- End quote --- Some of those 1970s "PCs" fetch surprisingly high prices. --- End quote --- One of those PC's appears to be NOS, still sealed in its plastic packing. |
| Specmaster:
--- Quote from: mansaxel on July 02, 2022, 09:24:31 pm --- --- Quote from: Specmaster on July 02, 2022, 05:08:58 pm --- Well, it's a real shame you didn't make that clear from the start :palm: --- End quote --- He did. --- End quote --- Not in his very first post on page 4994 post #124828 he didn't, but it appears that he did in post #124837, some 9 posts after the first mention that a dispute had been opened. Somehow I missed this post as I was scrolling down trying to catch up with all the days' activity, and so I still stand by my claim, he didn't mention it in his first post about the problem. :popcorn: |
| AnalogueLove1867:
TEA... Transversely Excited Atmospheric LASER! https://en.wikipedia.org/wiki/TEA_laser Sorry, couldn't help myself ;D |
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