Products > Test Equipment
Lecroy DDA-5005 Control Pad Repair
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ReedTriesToRepair:
I'm attempting a repair of an oldie-but-goodie Lecroy DDA-5005. It has an issue with the panel controls: the scope does not receive any inputs from any buttons or potentiometers, and none of the lights light up. The scope works great with the keyboard and mouse, but it is missing the good old manual scope controls and I would like to get those working again.

This problem preexists me, and I bought two of these scopes at once. On one of them, the screen doesn't power on (a project for another day), but I have tried swapping out the control pad, no dice. Ignoring the one-in-a-million chance both control pads are shot, there has to be something else going on here. Further, since the pots aren't responding, it has to be another problem because the pots stick through the control button pad into the frame.

Has anyone seen this problem before? Looking for any advice before I peel one layer deeper into the onion.
ReedTriesToRepair:
Update: After tearing down about half of the computer side of the scope, I swapped out the circuit board behind the control pad and now it works! I wasn't expecting the solution to be that easy. It seems like the front of this scope has seen some physical trauma and some of the knobs were pushed in, which may have contributed to the issue. Also when I pulled the board out it was super dusty (>1 inch long dust balls, see pictures), which also may have contributed.

When I was inside the scope I saw some expanding caps on the mobo which have dented their casing. Looking like they could blow any day. I suppose I should replace those. As they say, work begets work.

Also today I got my other scope of the same model to power on the screen and go into BIOS, but I think the HDD is fried because it doesn't boot up. I will make a copy of my other scope's HDD and throw it in to see if it works. Then I will either need to see if I can source a new control pad circuit board or repair the old one, but I will cross that bridge when I come to it... progress...
hpw:

Nice that you find out the dust issues, so you where faster  :-DD

Do you run on W2K? Always best to clone using an SSD 120G (max)

Hp
ReedTriesToRepair:

--- Quote from: hpw on January 21, 2023, 03:31:00 pm ---
Do you run on W2K? Always best to clone using an SSD 120G (max)


--- End quote ---

Yep, W2k was what came on the PC and I hadn't considered an upgrade. How can I find out what versions of Windows the software is compatible with? I would love to get it as high as XP if possible.

I was going to put another HDD in there, but make a backup copy of it in case of failure. 120gb IDE/PATA SSDs seem oddly expensive on eBay.
DaJMasta:
Just cloning the drive over to an IDE SSD would make for a substantial performance increase, you can install standard XP on these machines (but installation of XStream needs a second driver pack in addition to itself and the motherboard drivers), but I'm not sure you'll see any real performance or feature difference - I don't know if it's worth reinstalling everything.
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