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Agilent 54835A scope (4 channel 1GHz / 4Gs/s) repair & uphack

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tautech:
Front panel USB connectivity ?

Could you shoehorn one of those USB drive bay panels in where the the floppy drive is ?

nctnico:

--- Quote from: tautech on July 13, 2017, 10:20:59 pm ---Front panel USB connectivity ?

Could you shoehorn one of those USB drive bay panels in where the the floppy drive is ?

--- End quote ---
I thought about that. First of all I have not been able to find USB drive panels which fit into a slimeline 3.5" drive. Secondly and worse: Windows98 starts acting up if I DISconnect the drive. This may have to do with the fact that it isn't a normal floppy drive but a combination between a floppy disk and a 120MB optical drive (pretty amazing how they put all that into such a small space). I think I'll opt for a USB extension cable.

edit: Windows98 starts doing weird things when the LS120 is disconnected

tautech:

--- Quote from: nctnico on July 13, 2017, 10:30:06 pm ---
--- Quote from: tautech on July 13, 2017, 10:20:59 pm ---Front panel USB connectivity ?

Could you shoehorn one of those USB drive bay panels in where the the floppy drive is ?

--- End quote ---
I thought about that. First of all I have not been able to find USB drive panels which fit into a slimeline 3.5" drive.

--- End quote ---
Yep, slimline will probably be hard to find but keep an eye out for something proprietary from HP, Dell or similar PC's.

nctnico:

--- Quote from: alm on July 13, 2017, 09:39:26 pm ---Thanks for the update. Great that replacing the hybrid turned out to be a complete fix (which was like 90% likely, but you never know until you try it).

--- End quote ---
Actually there still is a minor issue with channel 4. It doesn't pass vertical calibration. A quick check didn't reveal an obvious attenuator problems so maybe some gain control setting is at it's maximum.

alm:
Interesting, given the lack of wear on that channel. But maybe they used a BNC cable or a probe that does not have power/ID pins. Could be that one of the resistors drifted after being overloaded.

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