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| Test Equipment Anonymous (TEA) group therapy thread |
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| Vince:
--- Quote from: Neper on July 03, 2022, 11:26:38 am --- --- Quote from: Vince on July 02, 2022, 07:24:10 pm --- I am quite interested in what looks like an old A3 format HP Plotter... --- End quote --- Speaking of which, there used to be a company making HP-compatible plotters and selling them by the boat load. Had one to plot films for making PCBs. I can't for the life of me remember the name of this company. Any help? --- End quote --- No idea... |
| factory:
--- Quote from: mnementh on July 03, 2022, 01:34:23 am ---WELCOME TO 5000! --- Quote from: factory on July 02, 2022, 07:48:19 pm ---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 --- Okay, I've traced out the 54621D and the VCC, GND are in the same locations, plus Pin 10 dssig_grd is also tied directly to GND. However the BRIGHTNESS pot is not brought out to this header on the 54621D. VSync HSync My guess is that 13/14 are still the sync signals, and they have repurposed 7, 8, 9, 11, 12 for their greyscale scheme. 54645A agrees; trace 1 is the 54621D, trace 2 is the 54600A. However, pin 8 is a different story; all I'm getting from the 54600A is noise. :wtf: Then the light dawns; the pot isn't connected to the monitor PCB, duh. Then it occurs to me the voltages usually present on a brightness pot, so I connect the cable back in the 54600A and probe the pot. Yup... (-58V) sent out pin 9 to the pot. Without knowing how the 54621D does its greyscale, I'm not too sanguine about connecting that (-58V) back to its mainboard. I think this is probably a good point to call it a night. ;) mnem :-BROKE --- End quote --- The intensity control is just about visible below the CRT in your pictures, you should be able to confirm if it's a 200k pot, as shown in the diagrams for the Agilent 54654N, by measuring the resistance. :-// The two connections (video) "half bright, full bright" look as if they might go straight to the neck board, based on the diagrams for the 54600A, which has an even older Hitachi CRT board, again using the 7403. David |
| tggzzz:
--- Quote from: vk6zgo on July 03, 2022, 06:37:01 am ---Yonks ago, I remember driving a 100E Ford Popular back from London to Southampton on the M3. Back in those days, the Poms were well into tailgating, with the worst offenders being "chaps driving Jaguars". Downright terrifying, with the poor old "Pop" screaming its guts out, and a Jag bonnet emblem seemingly in the back seat. Tailgating was not rare in Oz at the time, but I was surprised how 1970s Brits made an artform of it! "Culture shock", I guess! --- End quote --- I've been known to repeatedly slow down and then speed up by 5mph. I really ought to develop an index relating manufacturer vs how long it takes for the driver to Get A Clue. Wonder which would be beat/worst :) |
| tggzzz:
--- Quote from: bd139 on July 03, 2022, 08:55:55 am ---Worth it :-DD Welcome back to crazy town :-DD Edit: woohoo just sold 4 books to a local ham instead of getting mugged by ebay >:D --- End quote --- They buy some strange things. Completely unlike us, of course. |
| tggzzz:
--- Quote from: bd139 on July 03, 2022, 11:03:46 am ---Usual tactics on here. Now we expect tggzzz to come along and say he's using a different page size :-DD --- End quote --- https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg4244926/#msg4244926 |
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