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Test Equipment Anonymous (TEA) group therapy thread
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Vince:
... or maybe just use cheap crap chinse shop hydraulic press used for wheel bearings.
The cheap bench ones are not so good for their intended use, but if you use them for punching sheet metal they would probably do just fine ?!

Only 100 Euros for this small 6 tonne one :

https://www.amazon.fr/Presse-hydraulique-datelier-Pression-pressage/dp/B074N1Q2V6/ref=sr_1_15?__mk_fr_FR=%C3%85M%C3%85%C5%BD%C3%95%C3%91&crid=QLBVHUNLNZHM&keywords=presse+hydraulique&qid=1656868633&sprefix=presse+hydraulique%2Caps%2C142&sr=8-15

... but we get ripped off in France, probably worth only 40 bucks at Harbour Freight in the US I bet

BU508A:
@Vince:

No need to fiddle around with funny hydraulic presses or so. Just get a set with an approbiate hydraulic tool for 209 Euro (NAWTS):



https://www.ebay.de/sch/i.html?_dkr=1&iconV2Request=true&_ssn=cnc-speedmetal&store_name=cncspeedmetal&_oac=1&_dmd=1&store_cat=11854325012

If you want good quality, go after the Greenlee sets but they are three times more expensive, if available.
Vince:
Hmmm cool, a purpose built hydraulic thingy for punching, how practical. Takes much less space than a shop press, you can just store it in a drawer/box, I like that...

Robert763:

--- Quote from: Zoli on June 13, 2022, 10:31:37 pm ---Some time ago, I've purchased a Fluke 8060A(parts only, $42.00 - little expensive). Install new alkaline, turn on - no display. Open up, start checking - why the brand new battery has only 8.2V?
Well, the Gorilla was here, and left two shorts(Gorilla1-2.jpg; red arrow:short on the bottom, continued on the top thru a capacitor pin hole). Removing the shorts, the LCD came back to life; time to start the capacitor replacement.
Oops, more Gorilla footprints: broken LCD bracket(LCD_Support.jpg) and button support(Assembly_Support.jpg), Well, I need to dig out/install the Tools_of_Trade: Dremel, vertical tool stand, 0.5mm Carbide drill.
Glued the parts together with CA(Loctite.jpg) as placeholder, then proceed with the drilling. After drilling, add a drop of CA on the top of the hole, move the wires(0.45mm, leftover from the 10µF replacements) in-out a few times to fill the hole with CA, add a drop of accelerator on the top, then let cure for 24 h.
Replace the caps(surprisingly, no leaks) and the MAC socket, let the PCB and MAC soak in isopropanol for 24 h, short iso rinse, then dry for 24h more. Assembly, test - almost spot on. But since it has a good family to join, I've adjusted a bit...
Anyway, when I will have the time, I will make some tools to properly adjust/calibrate the whole family...

--- End quote ---

I just noticed that on one of your pictures the LCD mask is under the lower tabs / clips in the mount. This is incorrect and puts stress on the LCD. The mask should butt up to the tabs, not under them. Hopefully this was a before picture.
mnementh:

--- Quote from: m k on July 03, 2022, 04:35:27 pm ---
--- Quote from: mnementh on July 03, 2022, 02:46:40 pm ---
--- Quote from: Robert763 on July 03, 2022, 04:22:44 am ---
--- Quote from: mnementh on July 03, 2022, 01:34:23 am ---WELCOME TO 5000!           
...
I think this is probably a good point to call it a night. ;)   mnem    :-BROKE   
--- End quote ---

Hi Dwagon,   Did you see my posts
https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg4275517/#msg4275517
and
https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg4275556/#msg4275556

Looks like same video scheme as the 892x series a Gondbes 8220 video converter would be my next stop.
--- End quote ---

Yup, sure did; and followed that rabbit-hole down to that LCD mod. Very tidy! :-+

Problem is that the models we have tech ref on... the ones we've been talking about... are all proper non-greyscale monochrome monitors. Also, this family of monitors are all "1000 line" resolution (IIRC, I read that they "use" ~960 lines), so not too sanguine aboot dropping down to 800x600 resolution.  :-//

There's a CDM-7SX191 monitor on eBay right now for $80... I've been meaning to get into one of these Chinesium video scan converters as a diag tool for a while, so that might still happen... but I think that if I were going to fix this scope, I'd prolly bite the bullet and buy that monitor.

This of course is all dependent on how my dispute resolves out.  ;) I wanted to spend a little time tinkering just to see if there were signs of life; I was hoping it might be easy to mod the CDM-7SF191 I have in that 54600A so it thinks it's a CDM-7SX191.

I may instead try remoting into it over the RS-232 instead... in which case I'll soon be hunting down that software you posted and firing up the old WinXP Toughbook.  >:D

mnem
 :blah:

--- End quote ---

More CRT types needed.

54600A Pixel_data and Marker_dots are already 32 levels internally, but only 2nd and 4th of Pixel_data are used externally.
So taking out all five is pretty simple but the situation should also be very clearly visible in the monitor.
Old Intensity reference pot can grant its pins.

54600A Pixel_data goes through U37 74LS194 and then HB goes to U30 74ALS08, FB does the same but first ORing Marker_dots in U31 74F32, so either will do a final FB.
All gates are used so extra chip must be added, no idea when the device is designed but 5 TTL monitor pins feels a bit too much.

nixiefreqq's neck board has 1 FET and 3 BJTs, I'd say that 5 TTL pins are not there.

Since 74S03 is the earlier model my guess is that later monitors became better and external data level reference was not needed anymore.
So comparing two datalines will tell how the situation is.

Testing with an extra *old* computer monitor should also be pretty easy, if one is available.
One gate chip is needed, old display modes were selected by swapping sync polarities.
Using only green as data is also fine.

Functional monitor is not needed if vertical line movement is possible, since its color value is different it should be very visible.
Maybe duplicating buttons of two side by side machines can do settings.

Resolution
255 V x 500 H 54600B
256 V x 500 H 54615B

54620-series
255 vertical by 1000 horizontal points (waveform area)
32 levels of gray scale

Is it really 1000 pixels?
Vertical is the same as before so monitor is probably also pretty same as before.
I tried to find some tube info but everything was too old.
So no real idea of physical resolution of those 7" mono tubes.
But it can be checked, just compare those old and new 546xx horizontal lines, 1000 res has half the pixel length.
If shorter pixel length is there then different CRT must be also present, if that is the key.
--- End quote ---

It is entirely possible I misremembered the line count on this monitor and conflated the numbers with those above. We know that the 54645A is using a PAL combi chip, so up to 625 lines (I can't remember if that's interlaced or not) to play with; so yeah, I can see those numbers being legit.

54645A and 54600A both use the same DataRay CDM-7SF191 part number. I've attached some pics. The main and CRT PCBs appear identical, even though the older CDM-7SF191 in my 54600A uses a Panasonic M18JCB34GH CRT vs the Toshiba E9054B31-CDHT CRT in my 54645A. That Toshiba CRT, however, is the same as the in the 54621D, so the CRTs in all 3 models must be interchangeable?

I'm thinking now that my original surmise is correct... provided nothing wrong with the mainboard, we should be able to get something useful on the screen with the 54621D and the CDM-7SF191 from my 54600A. Just need to see how they're modulating the brightness to get those greyscales. I guess my next step will be a breakout PCB.  ;D

For now, tho, I've had to put it away; wifey has requested I look at the AC in our old Saturn.

mnem
 :-/O
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