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Chuck, Please don't include me in any "argument" over whether to replace these couplers or not. I don't have the credentials or experience to discuss, much less argue the point. Certainly not with a

I鈥檓 kind of surprised they handed out 鈥渟econds鈥� to JA folks. In 鈥�79 I was a JA advisor at Opto div, at that time if JA needed it JA got it. We did an electronics project and our division PCB

OK, Thanks, Bob

I tested the cap's leakage at 1KV, and it was 0.3uA. 1uA is 1V on 1M. And here we have impedances around 10M. It is concerning, especially since the cap has 1.4kV across it. -Chuck Harris satbeginner

I would suggest you open it up remove the proc board and PS cover. Then blow out the dust. We have found any 鈥渘ew鈥� unit to our facility was fairly dirty. The split wall between the PS and HVPS is

These puppies were OEMed by Tek. The one I got had banana plugs broken loose from PCB. Steve Lindberg Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

I am duly chastened. You all have argued, to the internet's satisfaction, no doubt, that every opto coupler in every circuit should be replaced on sight... ;-) ...And yet, in the hundreds of switchers

Hey Dana, IIRC the standby power supply that allows soft-power on is also responsible for powering the main switcher. Maybe the standby supply needs recapping. The TDS5/6/7As are also well documented

This scope has been excellent to date. Now when turned on it power cycles. It will start up, most of the time complete the POST, then power itself off after a minute or two. Before I spend the next

The HP optoelectronics handbook contained data on designing for aging of LEDs in optocouplers so they saw this as a real phenomenon. Bruce

I would echo Chuck's thoughts about opto-couplers, they are pretty reliable but I would also remind you that a meaningful test (especially on old devices) must include checking the CTR (Current

Glen, Excellent advice. A couple of others who have repaired these same power supplies mentioned these same parts as troublesome. These optocouplers cost next to nothing. I can replace and eliminate a

Hello, I鈥

It was not leather, but leatherette - a plastic faux leather. Which is why it degrades over the decades (probably because the plasticiser leaches out), cracks and falls to pieces. As does the piece of

Hi, Yes, definitely. The FPP error is 99% because of the nvram battery failed an lost the calibration. All other fails are likely a result of it. You can verify it by going into the extended

Hey Mark, The early TDS5/6/7 suffered terribly from capacitor plague. I have a TDS684A in parts that will probably never be anything but a parts donor. All the electrolytics on the acquisition board

The 485 has the wonderful temp controlled Siemens motor and impeller design fan. It draws the air in through the enclosure and expels it at the back of the scope.

Hi, I have had one for a couple of years and I'm very pleased with it. The fan is a bit loud for a home environment and my wife complains if my project takes over the dining room, but I can tolerate

Hi Dennis, You're right, we strayed. This is how we got here: While discussing the modular construction of the 577 curve tracer and the possibility of changing a 577D2 into a 577D1, this happened:

In the late 70's I was in a Junior Achievement program sponsored by a couple of guys from HP optical (Page Mill); they took us on tours, told us lots of stories (some rather racy), and gave some of us