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ARCHIVE: HP 54621D Mainboard Pics
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shakalnokturn:
Thanks for posting.

This answers one of my doubts on the L.A. side of the MSO: Inputs on pin #5 on 1NB4-5036's appear unused, can be handy when one logic input is dead...

Aren't you tempted to hack it up to 100MHz?
mnementh:
Ehhh.... my work thus far with this 54621D has been directed at trying to reverse engineer the video. This scope uses a CDM-7SX191 industrial monitor, which has been destroyed/parts robbed by gorilla abuse.

I have a backup/parts mule 54600A which uses a CDM-7SF191, which is all TTL. The CDM-7SX191 is TTL Sync with a single (probably some variant of VGA) analog video signal. At this point I'm convinced that the difference between the two monitors is entirely in the CRT neck board... so I am trying to reverse engineer that.

Any other hackage would come after that fundamental problem is resolved, though honestly, there is little motivation to go there, as I have a 54645A I'm perfectly happy with, the 54600A, and a just-acquired Teledyne/LeCroy T3DSO2102 to play with. If and when I go hacking, it will probably be to convince that scope that it is indeed a SDS2000X-series MSO.   :-DD

mnem
 :-/O
tautech:

--- Quote from: mnementh on July 21, 2022, 01:18:11 pm ---Ehhh....
and a just-acquired Teledyne/LeCroy T3DSO2102 to play with. If and when I go hacking, it will probably be to convince that scope that it is indeed a SDS2000-series MSO.   :-DD

mnem
 :-/O

--- End quote ---
:horse:
SDS2000X !
mnementh:
ouchies, mr sqweek...!

sorry... fixed now.

mnem
*whimper*
TCPMeta:
I know it's been a hot minute but any further progress been made with this?
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