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Test Equipment Anonymous (TEA) group therapy thread

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bd139:
I saw that and went ooh, ahh and then ran away  :-DD

Got two of these in that HP. Paid for itself already!

factory:

--- 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

McBryce:

--- Quote from: Specmaster on July 02, 2022, 10:46:29 am ---Seen today on Ebay UK, anybody requiring a 50Mhz LA, starting bid of only £15...

https://www.ebay.co.uk/itm/255609408885
WTF is this?

--- End quote ---

Plus the medical costs to recover from the multi-resistant super infectious fungus that you breath in after opening the case?

McBryce.

factory:

--- Quote from: Robert763 on July 01, 2022, 08:21:44 pm ---
--- Quote from: factory on July 01, 2022, 07:27:24 pm ---Another grey box* red box (for a change) arrived today.  8)


*I often get the comment "not another grey box" when large parcel(s) arrive.

David

--- End quote ---

Racal SA 540 Universal counter


--- End quote ---

Yes the SA540 I posted on here in April I think, ended up talking myself into buying it, after contacting the seller about shipping. The seller was very helpful, I asked them to chuck away the cable & three pin mace, which they did, as the Plessey connector needed rewiring anyway. It's in really nice condition, but being Racal will probably need many replacement transistors.
It was definitely worth the wait, shame I can't leave positive feedback, as it took a little longer than ebay provide for leaving feedback.



P.S. Has anyone seen a manual for this version? I do have them for the slightly more common, four & six digit versions.

David

mnementh:

--- Quote from: Specmaster on July 02, 2022, 09:23:18 am ---
--- Quote from: nixiefreqq on July 02, 2022, 12:43:27 am ---<snip>

gotta' agree with the dragon on this one.

with those two T-15 screws missing from the back the cabinet will almost fall off on its own.  (don't ask how i know)

even if you did not know there was supposed to be a display board inside, how could you not notice the ribbon cables hanging loose inside?

will be interesting to see how it all plays out.

edit  just looked and there are supposed to be 3 screws back there.  mine is missing one.



--- End quote ---
Agreed about the screws and the ribbon cable hanging loose etc, but I'm talking about the dragons claim that it is "not being as described", if you actually read the sellers description of the item, it fits the description precisely as the seller states

   "Condition:    
   
Overall Condition    AS-IS (Please view all pictures)
Cosmetics    Please view all pictures
Completeness    As seen in pictures
Functionality    AS-IS (Powers on / Unable to test further)"

They do mention that it was missing the handle, hence why I asked the dragon "Have you powered it up?, did the lights come on? ", if so then it matched the description as the seller also states that the unit is as shown in the photos. I was playing "Devil's advocate".

Now I may be totally wrong here, but I suspect that the seller is not a one-man band and so it is a reasonable assumption that the item might have been tested and packed by someone who does not have a clue what they are doing, maybe a school-leaver etc., the back may not have come off while they were wrapping it, therefore they would not have known the ribbon cables were hanging loose inside, who knows  :-// :-//
--- End quote ---

Because we don't have the right to pre-inspection of the auction, the burden of accurate description is on the seller. Failure to disclose egregious deficiencies is a breach of the seller's contract with the buyer and with eBay. Dealing in good faith is required; it's right in the terms of use.

You can't claim ignorance of the missing part when you are in the business of selling TE as whole and for parts, which this seller definitely is. You especially can't claim ignorance (even though it is quite manifest here; the part robbed from this unit ruins this scope and the scope it was installed into) when you rob parts out of a unit, then throw the remains into a box such that the bubble wrap is the only thing holding it together.  :palm: And the fact that he disclosed the missing handle is proof that the seller understands they have the burden of accurate description.

Bottom line is that this is exactly the kind of situation that the eBay Dispute Resolution process was created for. If the seller doesn't make it right, I will send it back on my own dime, and shove it up his arse with PP dispute resolution and negative feedback. I can eat $30 to make that happen.

And then of course there's the fact that he's lost everybody in here as a potential customer, as it is quite obvious this seller does not deal honestly. He's already proven that just by trying to sell this pile of shit as a oscilloscope with some actual value, even as a parts unit.

Remember, there's a reason this unit was chosen as a donor for the monitor PCB: there is obviously something else wrong with it as well, so the mainboard is likely not a good part either. So "Unable to test further" is an outright lie; this unit was tested, found defective, and robbed for parts.

TL/DR: This seller got caught playing the Caveat Emptor game. That makes them an untrustworthy vendor, and the folks in here need to know this.

mnem
 :popcorn:

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