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Berni:
Now that is quite the bad luck, but im sure you can get the parts for at least 1 working one out of all 3.
I recently had quite a scare with a 110V situation. A bunch of gear came into the lab recently and i made sure to switch it all to 230V when going trough it and testing it, most of it worked, some of it mostly worked. But then there is the WaveCrest digital time system that has no selector switch and has a 110V sticker on the back. Weeks later when i got to do proper performance testing of it i forgot about it and just thought to my self "I switched it all to 230V anyway". So i plug it in and it turns on as usual and starts booting but then turns off after just a second or two. Also i thought i have heard a transformer hum when plugging it in that i don't recall hearing the first time around. I start checking for power and then see the 110V sticker on the back.... oh fuck i put 230 in it.
What seams to be half a million screws later i finally was in and half of the case was a pile of off the shelf PSU modules, some switching some linear. The switching supplies said they are universal input voltage, but the linear ones had 110V marked on the stickers. The primary wingdings on the transformers still seamed to have a few Ohms so that's a good sign. Applying 110V power this time around nothing happened, but also none of the transformers had power to the primary. Eventualy i found pretty hidden fuse socket in the IEC connector on the back to find 2 separate fuses (One for live one for neutral) that are both blown. Sticking new 5A fuses in got it back to life again. Phew... that sure had me going.
capt bullshot:
--- Quote from: Berni on August 09, 2018, 05:23:14 am ---Now that is quite the bad luck, but im sure you can get the parts for at least 1 working one out of all 3.
--- End quote ---
Powering up 120V TE with 230V may cause quit a lot of wrecking. Once I've got a bunch of five MG3633A, all of them set to 120V, one tried out by the seller using 230V, resulting in blown fuses. Total damage was a bit more than a blown fuse:
http://wunderkis.de/mg3633a/repair3.html
Ice-Tea:
--- Quote from: PTR_1275 on August 08, 2018, 10:59:26 pm ---If you want to part out those 2 66332a, let me know. I’ve got a few here needing parts to get them up and running. Front pcba (well mostly the display but it’s a pain to get out of the board) and possibly 1 control board if it didn’t fry.
--- End quote ---
Well, I actually sold one before I received the units. So, when I confessed I couldn't deliver the customer asked if he could have the dead units. As they are not worth enough to me to attempt repair I let him have both for a song. Seemed like a good way to make up ;)
Ice-Tea:
Re. the odd screen: there's a contrast knob on the back. Fixed. :-DD :palm:
ArthurDent:
Yesterday I bought a lot of instruments from Craigslist that were all guaranteed to have some problems. From what I’ve seen so far, that is correct, but some look like they are easier to repair than others.
A Dynaload electronic load had a meter that worked but showed a dead short across the terminals. Lubricant on a couple of switches had stiffened up and relubricating them solved that problem. The short was caused by 2 of the five paralleled 2N3055 load transistors being shorted. It works for testing with 3 and replacements are on the way.
An HP 6032A 60V/50A 1000W system power supply has a broken switch and an electrolytic cap that blew but didn’t destroy anything else. Also a second 8V/20A HP 6541A system power supply that doesn’t look too bad.
One Fluke 887 differential meter that looks pretty good but needs batteries, five HP3478A meters that need batteries and calibration, Wavetek 164 and HP3314A function generators, and an HP 8657A synthesized 1Ghz signal generator, and a couple of other items.
The seller was moving and just wanted to clear this stuff out quickly at $20 for each item. Repairs on this pile will keep me busy for a while.
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