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These schematics are for the TDS540, but the power pins will be the same:





Jared

Thanks for the reply...

After having spent some time going through the CPU/CTM schematics I am inclined to agree with you, it's more probably a mechanical connection problem somewhere. The un-read CH1 probe sense ring is easy to check.
The D0-D7 bus lines on the 6802 are MUXed to many places, not only reading the push buttons but also the ROMs running the firmware. Given that, I suspect an active component failure on a data bus line would kill the entire CTM firmware function including the scrolling "Control Button Error" message. Hopefully it's not some small timing problem in one of the multiplexers...

It won't be the first (or probably last) time I will have reseated connections in my older gear. It's the price we pay to keep legacy equipment operating.
I just need to be particularly careful with the CTM/DMM button extension and Time position knob removal (if necessary). Don't want to break any plastic parts...

See

It has an alternative part number

(Not my auction just a Google result)
Sent via mobile annoyance thingy, please pardon any typos.

On Sat, Mar 8, 2025, 9:09?PM ed breya via groups.io <eb=
[email protected]> wrote:

If your probes don't seem to be Tek or related to engine analyzers, then
also look at HP's foray into laser interferometer systems, which had some
transducers for barometric pressure, temperature, and other physical stuff,
to compensate for effects on the laser optics. HP also had some other
pressure transducer stuff related to HPLC and GC in their analytical
equipment lines, up to around 6,000 PSIG.

Ed

If your probes don't seem to be Tek or related to engine analyzers, then also look at HP's foray into laser interferometer systems, which had some transducers for barometric pressure, temperature, and other physical stuff, to compensate for effects on the laser optics. HP also had some other pressure transducer stuff related to HPLC and GC in their analytical equipment lines, up to around 6,000 PSIG.

Ed

Here's the rest.



Ed

I had to look. Here it is. Good luck.



Ed

Are these Tek products? If so, look at the engine analyzer line from way back. One of the Tek "Concept" book series addresses this so may have some pertnent info.

Ed

In my collection of probes, I have a P6610 physical measurement amplifier and three P6610 pressure transducers. I don't have any documentation and a search of the usual sources has come up empty. Wondering if anyone here knows anything about this probe or, better yet, has some documentation they would be willing to share.

Thanks - Bill

Do I see a 27xx spectrum analyzer? Expensive for parts but for dirt cheap project maybe.....
The rest is landfill.

I am here as well.

On Sat, Mar 8, 2025, 4:38 AM David C. Partridge via groups.io
<david.partridge@...> wrote:

AFAICT I am now the only active moderator. I think we need some more
moderators.



Cheers, David

On Tuesday 04 March 2025 11:43:29 am taitny via groups.io wrote:

The Edison Tech Center is clearing out it's collection of old scopes and test equipment.
If interested, check out

Some of us don't do facebook...

From what I can see, it looks like they want to get rid of that stuff as one whole lot. :-(

--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin

AFAICT I am now the only active moderator. I think we need some more
moderators.



Cheers, David

I recently upgraded my TDS3012 by ethernet, there is an page on the scope's web interface to input commands.

The Edison Tech Center is clearing out it's collection of old scopes and test equipment.
If interested, check out

Hi,
the spot is always coming vertically outside the screen, when I change the polarity (about one graticule outside).
I have tested the VertPos Adj pot but it is not enough to get the points back in the correct vertical position. any suggestions?
thank you,

You know how sometimes the Universe just sends you signals, perhaps to remind you that you are on the right path?

Well, this morning I received a phone call from the man who often supplies test equipment. He has a friend who buys up the assets of failed companies and when test stuff appears, I generally get a call. They just want rid of it and often pretty much give it away. I've bought too much to remember, however two items which spring to mind are spectrum analyzers, a HP 8569B for (the equivalent in Brazil) less than 20 Dollars and a Tek 492 for 35 Dollars. Both with failed PSU's and both fully functional following simple repairs. Insane! Although I mustn't forget the 'dead' (yet calibrated) Fluke 289 for 40 Dollars which only had a bad battery connection and is now my most accurate DMM.

Anyways, I digress... This morning, he rings me up to offer me two scopes for 50 Dollars. Would you believe it that one was a 2430A!?!? Lol

The other was/is a TAS 465 which he said was missing a board, but looking at the manual and a teardown, it appears to be complete. The problem being that it only displays a stationary 'dot' in the middle of the display.

So, opening up the new 2430A, revealed that on the top board, two tantalums had totally burned up, ironically including the 2.7?F one mentioned earlier in this thread..

Seemed reasonable to just switch the board from my blurry 2430A and sure enough the 'new' scope came to life, displaying the diagnostic menu et al.

Unsurprisingly it has various 'FAILS' however, it now gives the opportunity to switch boards and Hybrids in order to hone in on any problems.

The TAS 465 shall have to wait.

Addendum... The TAS 465 (which had been left plugged in but off) just went pffffftah! and dumped out a whole load of smoke. Guess I now know where to start.. :)


James

Check harmonica connectors from panel to other boards possible to reseat.

Jon

Recently my Tek 2236 began giving a "Control Button Error" message, occasionally at first and now more regularly. Exercising the buttons does not seem to clear this. I ran the CTM diagnostic and everything passes except reading the 1X/10X CH1 sense ring, always indicating "P0" even when the ring is grounded (I don't know if it ever did sense correctly, as I generally used non-encoding probes anyway). In the diagnostic, it reliably reads the positions of all other switches, in particular indicating the push button positions solidly, no glitches seen in the 1/0 transitions in the diagnostic display.

Sometimes with no input I get the "OUCH" message on CH1 volts (even with the input set to ground). Otherwise, all of the CRT display functions appear unaffected.

When the CTM is working, everything works in the alphanumeric display, when not, I get the scrolling "Control Button Error" message, nothing works in any button configuration.

Anyone have any thoughts on this?

I have several Tek scopes, analog, full digital, storage (for a 5L4N) and a 4 channel. However the 2236 is my favorite for general bench work. I miss the built-in frequency counter...

Hello, The truth is that I took a while to post because I didn’t have the money to buy the spare parts. I had to work extra hours for two months to afford them. I'm sorry.

In fact Mark, I actually have here a HV board with a blown transformer so I can grab the resistors from that . If for nothing else other than to see what happens?

Thanks again