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I made a mistake due to brain half-life. The serial number on the lower chassis is not E01. It is E-02.

Ha, Artesyn! Funny story: years ago, probably in the mid to late 1990's, I was at a seminar, and at lunch I happened to sit next to a guy from Artesyn. For some reason, we were discussing work disasters. I mentioned a recent incident in which a board had caught fire in the lab while a customer was visiting (of course!). The Artesyn engineer said, "Oh, I can beat that! I caught a customer's hair on fair one time!" Yeeeeahh, that's bad!

Jim Ford

Just to close the loop on this - I watched the YT video with the guy repairing a TDS3052 (thanks for the pointer durechenew) - having established that it was the SMPS that was at fault, I thought I would check the same path he took, and, uncannily, my fault was exactly as his - the same resistor in the same pair gone open-circuit. Easy fix and the PSU comes to life and the 'scope powers up. Almost like it's a common fault with that Artesyn board.
Thanks for the pointers and advice, everyone.
Richard

We will shut down the stuff page at the end of the month to re-stock it, and many HP/Tek spares items as well as the FETs will disappear then.

There is a lot of new stuff to go up, including many interesting calibration and high end test items. I also just found another Data I/O 288 gang (8) programmer with the MOD87XX Intel 40 pin MCU programmer module. I thought somebody was looking for a way to do some MCU programming recently, so if you need such a gadget, please contact me now before we load it to the site.

There will be more Tek and HP knob lots and other trim parts to go up in the new page, and if you have any special requests, please email me directly, we will do our best to accommodate you.

Best wishes for everybody in the new year,
walter (walter2 -at- sphere.bc.ca)
sphere research corp.

Yes, I meant to say 4.

Thanks,
Manuel

There are four caps on the 'B' A5 board that leak.

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This email has been checked for viruses by Avast antivirus software.

Wayne,

If your in the US send me a PM with your mailing address and I’ll send you the one I have. Mine isn’t a beauty queen and I’ll just put a couple of generic feet on mine.

Manuel

On Sun, Jan 16, 2022 at 08:25 AM, Dave Wise wrote:

That’s a P510,

Yes!


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Roy Thistle

Hey everyone,

I took a long time to answer, busy life, etc. etc. Thank you Jim for proposing your help by the way!

I was able to fix this "Load application operation failed." issue when attempting to load the 32GPX application SW. It's very simple, it basically boils down to a dead on-board RTC cell battery. Here's a full description of the problem:

If you load the "Diagnostics" utility, you can find under the "CPU" module a routine called "Set time/date". By running this, you will find a "SET TIME AND DATE" screen displaying the current date and time in real time. If you have the same problem I had, you will notice that the time passes much too fast (approx. 10 seconds every second in my case)! This happens because the RTC circuitry is uncalibrated. You can calibrate this circuitry by running another routine called "M Clock Adjust" which is located in the same area (Diagnostics -> CPU). This routine allows one to plug a scope onto a testpoint in order to calibrate the RTC circuitry (by setting a variable capacitor, refer to the Tektronix documentation), but I didn't need to do that. By simply running the "M Clock Adjust" routine, the RTC became stable (meaning "not going too fast" any longer). Now if you attempt to reload the GPX32 software, you will see that it finally works!

Of course, since you have a dead battery, you will need to do this on every boot. You should change the button cell battery in order to fix this permanently (which is what I did). The 3V battery is a BR2325, 23.0x2.5 mm. Since (at least in my area) these are rather hard to find, you might be tempted to replace it with a more standard CR2325. Please know that contrary to the CR version, the BR2325 will hold its 3V voltage much longer as it loses its capacity. This means that a CR2325 might only last a couple of years while a BR2325 might last 10+ years. I just made up these numbers but you can look that up in the appropriate datasheet (I did this ~6 months ago and I'm now writing off the top of my head).

Now my Tektronix works, but I'm anticipating a hard drive failure (the HDD is 30 years old on this machine!). I'm trying to replace it with a CF disk of roughly the same capacity (128MB), but I can't get it to work properly. I'll keep you posted if I manage to do something.

Cheers!

You can find a photograph of the early Mode Control board at the TekWiki page for 067-0912-00. You have probably been there already. Mine does not have the perfboard addition hanging on it. The circuitry was the starting point for designing 067-0912-00.

Morris,
UGH that complicates things. There is a problem with R180 that is quite unique to the 284, the tunnel Diode is not much to worry about, It will lift out easy with a pair of tweesers. The main issue there is the lead from R180 friction fits in to the center pin of the GR connector. It is NOT soldered in to place on one side. Not a huge deal except that the diameter of the leads has shrunk and a modern equivalent will be loose in the socket. The top side is no big deal as it is soldered. Rebuilding the air line is not a huge deal just fiddly to get everything to match up. I needed to adjust the springs in mine as well as refresh the solder on the back terminator due to age and a slight touch of corrosion. The springs has fatigued a little. This important part is D180. I have found a place to buy them if you need a replacement but they are $250.00 EACH! At least that was the quote I got from the manufacturer a few years ago.

Zen

On Wed, Jan 12, 2022 at 05:08 PM, Jeff Dutky wrote:

I'm still waiting on a new run of the RU800 (
) so that I can have a non-donor
replacement U800 for my trusty 2465 DMS. If Ram ever manages to release a new
batch then you could always rebuild the 2445 with one of those.

Jeff, thank you for referring to my item on eBay. You bet I am working quite hard on a redesigned and re-laid-out RU800 which I have had to do 3 revisions of, trying to find time for it amongst my other projects. I am definitely happier with how this version of it is turning out, but just when it appeared to be nearing completion I am thwarted by what seemed like noise or oscillation on the highest speeds, causing a little blurring of the trace, but what in fact turns out, after 2 weeks of digging, to be crosstalk that happens on the all-important channel switch LMH6574. I posted the issue on the TI forums as well -- if curious you can see it here

I have ordered an AD8174 to see if it is the IC or something in my layout. Either way I believe I am not too far from releasing v2!
Cheers - Ram

On Sun, Jan 16, 2022 at 04:14 AM, Dave Voorhis wrote:

Though it’s notable that one mod did write, "The fuse is lit
though…….”, I assume meaning that member's time is limited if trouble
continues.

Yes. perhaps.
Yet after about a decade of watching Dave, I doubt he will ban anyone for saying something controversial.
Spamming would get one banned from EEVblog... but, no opining.

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Roy Thistle

Dave,

I think your last paragraph is absolutely correct, someone has posted the list of voltages needed. If memory is correct you do need 20V at the top end and for low voltages it is probably easiest to build a fixed divider at around 100:1, measure it with a DVM with say 10V in so you know the division ratio and then set the input voltage with the DVM so that the output voltage is what is required for the calibration. Since the supply only needs to be around 1% accuracy into a 1Mohm load it is not exactly rocket science.

Regards,

Roger

That’s a P510, an early Tek probe that was sold with the Type 531 and 535 mainframes in 1953. The cable is ordinary coax. At the introduction of Types 541 and 545, this probe was replaced by the P410, which has special resistor-coax cable that can make it to 30MHz without ringing.

Dave Wise

From: [email protected] <[email protected]> On Behalf Of Richard Peterson via groups.io
Sent: Sunday, January 16, 2022 5:56 AM
To: [email protected]
Subject: [TekScopes] Help Identifying Probe Found with Type 500/53 Cart

I found this probe in the drawer of a Tek Type 500/53 scope cart. It doesn't have a part number or brand on it. Any ideas? Photos here: /g/TekScopes/album?id=271763</g/TekScopes/album?id=271763>

Yeah, it's not warm at all. It's basically right in front of the fan so it gets most of the air from it. The main problem is the 6080 directly below it which cooks it. After I added my little heat shield and pulled the filter out the run time doubled.

I still think that the old capacitors in the HV section might be part of the blame, as well as the 1X2 tube in there. There's NO way any cooling air can get in and out of that section, so I'm thinking that the 1X2 is cooking the capacitors as well as the resistors in there, compounding the problem.

Which brings me back to my previous question, when did they start using the epoxy potting in the HV transformers? So far the only date I've found is on the fan, which is Feb 14 1966. But of course it could have been replaced at any time in the scopes history.

Eric, I would expect the transformer to get at least quite warm. The explanations say eventually up to the Curie-point of the core material, but I remember still touchable outside temperatures of my failing 491. That's my only own experience with failing epoxy.
When the screen grid voltage doesn't rise dramatically it's a sign that no excessive power is lost in the -4 kV HV circuits. (But it's still no guarantee that the -4 kV itself is correct since resistance ratio in the feedback circuit might drift when resistor temperatures rise).
Albert

Thanks for the reply Albert. When the traces start dimming I usually shut it off and record the time. I do have two new 6CZ5's on the way.

But I'm wondering, wouldn't the HV transformer get really hot if it was the problem?

I found this probe in the drawer of a Tek Type 500/53 scope cart. It doesn't have a part number or brand on it. Any ideas? Photos here: /g/TekScopes/album?id=271763

Richard Peterson <saaber1@...> added the album Help Identifying Probe: Found this probe in the drawer of a Tek 500/53 scope cart