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
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
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
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.
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
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
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
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=wappGuess 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