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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

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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

I've had 2 500 series handles break on me- one should have been obvious, it was rusted badly and only the metal was left, but the other one still had remnants of it's covering on it but was also

Hi Nenad, The diode bridge in the front end of the sampling head is extremely delicate. It doesn't take much to blow one out at which point there is nothing you can do except find another sampling

Ni Nenad, Not silly. I have been carrying 7000 series scopes around for almost 50 years and I have never given the handle a second thought because I have removed so many of them from instruments I

It is a shame that Deane Kidd is no longer with us - he could always find what I was looking for no matter how obscure, and on a few occasions asked for no money and shipped it free of charge (to the

Hi Gary, The service manual should list the part number in the rear section of the manual where all of the mechanical parts are listed and referenced to an exploded view of the mechanical parts of the

I learned an interesting lesson about eBay pricing trends from the CT-1 and CT-2. Back in the first half of the new decade (approximately 2000 to 2005) the CT-1 and CT-2 sold on eBay for $25 to $35

Hi Dave, What does a 7704A with a P7001 have to do with curve tracers??? The reason I changed the topic was to separate the discussion about 500 series scopes from the discussion going on about

Hi Gary, No. There was no onscreen readout on any Tek curve tracer except (I'm mostly guessing) on their very newest ones (post 2000). Dennis Tillman W7PF