Products > Test Equipment
Upgrading Mainboard in Lecroy DDA-3000 (aka WavePro 7300a?)
Converter:
--- Quote from: analogRF on November 07, 2019, 02:28:33 pm ---
--- Quote from: Converter on November 01, 2019, 06:09:44 pm ---Buy a new encoder? Sorry, but such an action is for completely armless people. There is nothing in them that even a child would not cope with.
In recent times, I have been servicing them without even soldering from the board.
--- End quote ---
yeah, well, I have repaired/cleaned a dozen of similar encoders on lecroy scopes (LC584AL and WP 960) and agilent power supplies but the problem was that the intermittent behavior usually comes back pretty soon specially if you use it frequently everyday. much much earlier than a new encoder.
if the brand new encoder is just $1-$1.5 I rather buy a brand new (along with other items that I might need in a BOM to combine the shipping) from mouser or digikey or newark. Soldering and desoldering them is a piece of cake really: good iron + good wick
--- End quote ---
Just that you should also bend the contacts a little, as the metal gets tired over time.
analogRF:
--- Quote from: Converter on November 07, 2019, 03:15:54 pm ---
--- Quote from: analogRF on November 07, 2019, 02:28:33 pm ---
--- Quote from: Converter on November 01, 2019, 06:09:44 pm ---Buy a new encoder? Sorry, but such an action is for completely armless people. There is nothing in them that even a child would not cope with.
In recent times, I have been servicing them without even soldering from the board.
--- End quote ---
yeah, well, I have repaired/cleaned a dozen of similar encoders on lecroy scopes (LC584AL and WP 960) and agilent power supplies but the problem was that the intermittent behavior usually comes back pretty soon specially if you use it frequently everyday. much much earlier than a new encoder.
if the brand new encoder is just $1-$1.5 I rather buy a brand new (along with other items that I might need in a BOM to combine the shipping) from mouser or digikey or newark. Soldering and desoldering them is a piece of cake really: good iron + good wick
--- End quote ---
Just that you should also bend the contacts a little, as the metal gets tired over time.
--- End quote ---
yes, I had done all of that...once I had to open and repair the encoder on AFG3252 like every 10 days or so! It would be perfectly alright for 10-12 days and would start misbehaving again. Same with a couple of encoders on LC584 and WP960....so I gave up and bought new ones and replaced them. at $1 or $1.5 I would always do it. Sure if you just need to buy 1 encoder and pay shipping for it, it might be considered as expensive but I usually combine them in a BOM with other supplies...
EDIT: at first I was afraid of ruining the board when desoldering them but after the first one I realized it was pretty easy and safe...but a cheap iron or cheap chinese solder wick will not do it.
nctnico:
--- Quote from: analogRF on November 07, 2019, 02:49:23 pm ---now I am a bit puzzled as to how the fans are disassembled from the unit? There is a foam like layer underneath for noise reduction which is probably degraded after all these years and I am afraid it may be destroyed if I try to lift the fan holder plate. Any hint as to how to safely and cleanly removed the fans and replace them?
--- End quote ---
You can unscrew the entire baseplate on which the foam layer is glued to. After that you can (carefully) manouvre the fans out including the base plate. In my unit the foam layer was perfectly fine. It is a kind of rubber-foam which doesn't seem te degrade.
DaJMasta:
I've also ran into some encoder issues on WP7k scopes, but mine have always just been oxidation from disuse. Give em a few dozen spins and they start working alright again - just seems like when stored in a non-ideal climate and not used for a while, they take some working to get registering properly again.
ZhuraYuk:
--- Quote from: analogRF on November 07, 2019, 02:49:23 pm ---
instead of those Gentle Typhoon Nidec fans (D1225C12B7) which was mentioned in the thread, I found these fans that you can easily buy from mouser : Sanyo Denky 9G1212F101 for the two big ACQ fans and Delta AFB0912H-F00 for the PSU fan
I have not replaced them yet but these fans are easily available and they have better specs both in air flow and static pressure and with the same noise level (or even slightly better) than those Gentle Typhoon fans which was expensive (at least for me with shipping to Canada)
--- End quote ---
Can you post screenshot of your temperatures for Aladdin acquisition board from Service Menu after you replace the fans?
I see that they are twice weaker as original ones and have high doubts about their ability to keep temperatures in safe ranges.
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