Tek 2467B very nice, with problems. - Page 2 - diyAudio
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Old 8th April 2012, 11:25 AM   #11
Gyuri is offline Gyuri  Hungary
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Hey, Tom,
Thank you for your reply!
I took on the middle of the things, extremely possibly.
The oscilloscope works, as you may see on this picture:
https://public.bay.livefilestore.com...are.JPG?psid=1
You may see it though on this picture, there is a Dallas DS1225Y chip:
https://public.bay.livefilestore.com...-06.JPG?psid=1
The battery is in it. Similar, that was on EISA motherboards. Who remembers EISA MCA architectures yet? MYLEX is the name of few for example.
I don't think that there is a need for full calibration.
Than I mentioned it above, there is a vertical mismatch.
The representation of the signs is perfect.
The trigger is stable, on all four channels.
Brightness, focus, astigmatism these are sems to be properly.
The cursor readouts are perfect, at volts and frequencies too, but only in manual mode.
But the CH1 VAR VOLTS/DIV as if it would not function properly. But the potmeter is all right, tested with DMM, according to CH2 VAR potmeter, which is works perfectly.
AUTO SETUP is out of order, as all of automatic measurements.
For your reference, the Service Manual found here:
https://skydrive.live.com/?sc=photos...1531&sc=photos

Thanks for your help in advance!

Gyuri
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Last edited by Gyuri; 8th April 2012 at 11:29 AM.
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Old 8th April 2012, 11:35 AM   #12
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Quote:
Originally Posted by gootee View Post
That sounds very hopeful, actually. At least it doesn't sound like the unobtainable input(?) chip is fried.

In my 2465, and some other 2400-series scopes, the calibration constants are all stored in an "NVRAM" (Non-Volatile RAM). But that NVRAM needs a BATTERY, to stay alive. Perhaps your battery just needs to be replaced.

For the re-calibration, you probably only need DC reference voltages and a timing reference (like a pulse generator). It's an easier and much shorter process than with the older Tek scopes.

Do you have the calibration procedure? You can substitute different test equipment, and can "fake" parts of it with lesser equipment, just to get it running.

In my 2465, the battery is on the top of the top circuit board, under the top cover. It's like a large silver disc-shaped wristwatch battery. I believe it's a commonly-available type.

Cheers,

Tom
I think you'll find that the battery might be an integral part of the DALAS NVRAM module in the second photo in Post #1.

Description

The DS1225Y 64K Nonvolatile SRAM is a 65,536-bit, fully static, nonvolatile RAM organized as 8192 words by 8 bits. Each NV SRAM has a self-contained lithium energy source and control circuitry which constantly monitors VCC for an out-of-tolerance condition. When such a condition occurs, the lithium energy source is automatically switched on and write protection is unconditionally enabled to prevent data corruption. The NV SRAM can be used in place of existing 8k x 8 SRAMs directly conforming to the popular bytewide 28-pin DIP standard. The DS1225Y also matches the pinout of the 2764 EPROM or the 2864 EEPROM, allowing direct substitution while enhancing performance. There is no limit on the number of write cycles that can be executed and no additional support circuitry is required for microprocessor interfacing.

Last edited by KatieandDad; 8th April 2012 at 11:39 AM.
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Old 8th April 2012, 12:16 PM   #13
Gyuri is offline Gyuri  Hungary
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Now I see, between 2465 and 2465B are more differences than 2465B and 2467B between.

http://www.us-instrument.com/objects...ge/img2300.jpg

http://www.us-instrument.com/objects...ge/img1006.jpg
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Old 8th April 2012, 12:18 PM   #14
Gyuri is offline Gyuri  Hungary
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So, dear Flg, if you have less button, it is a 2465.
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Old 8th April 2012, 12:28 PM   #15
Gyuri is offline Gyuri  Hungary
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It is because of this that Tom's machine some other kind of battery contains.
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Old 14th April 2012, 05:43 PM   #16
Gyuri is offline Gyuri  Hungary
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As my learned colleague would say it:
Stand on half foot while somebody helps you.

I say it, help yourself, and the God helps you.
He helped me already.
Although I would have omitted this rather.
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Old 14th April 2012, 08:15 PM   #17
Gyuri is offline Gyuri  Hungary
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I found this beautiful side while I was searching for useful informations on the web:
Audio, Verstärker, Meßgeräte und analoge Elektronik
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Old 14th April 2012, 08:46 PM   #18
Gyuri is offline Gyuri  Hungary
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Laurie Anderson:

Only An Expert


Now only an expert can deal with the problem
Because half the problem is seeing the problem
And only an expert can deal with the problem
Only an expert can deal with the problem

So if there’s no expert dealing with the problem
It’s really actually twice the problem
Cause only an expert can deal with the problem
Only an expert can deal with the problem

Now in America we like solutions
We like solutions to problems
And there’s so many companies that offer solutions
Companies with names like Pet Solution
The Hair Solution. The Debt Solution. The World Solution. The Sushi Solution.
Companies with experts ready to solve the problems.
Cause only an expert can see there’s a problem
And only an expert can deal with the problem
Only and expert can deal with the problem

Now let’s say you’re invited to be on Oprah
And you don’t have a problem
But you want to go on the show, so you need a problem
So you invent a problem
But if you’re not an expert in problems
You’re probably not going to invent a very plausible problem
And so you’re probably going to get nailed
You’re going to get exposed
You’re going to have to bow down and apologize
And beg for the public’s forgiveness.
Cause only an expert can see there’s a problem
And only an expert can deal with the problem
Only an expert can deal with the problem

Now on these shows, the shows that try to solve your problems
The big question is always “How can I get control?
How can I take control?”
But don’t forget this is a question for the regular viewer
The person who’s barely getting by.
The person who’s watching shows about people with problems
The person who’s part of the 60% of the U.S. population
1.3 weeks away, 1.3 pay checks away from homelessness.
In other words, a person with problems.
So when experts say, “Let’s get to the root of the problem
Let’s take control of the problem
So if you take control of the problem you can solve the problem.”
Now often this doesn’t work at all because the situation is completely out of control.
Cause only an expert can deal with the problem
Only an expert can deal with the problem
Only an expert can deal with the problem

So who are these experts?
Experts are usually self-appointed people or elected officials
Or people skilled in sales techniques, trained or self-taught
To focus on things that might be identified as problems.
Now sometimes these things are not actually problems.
But the expert is someone who studies the problem
And tries to solve the problem.
The expert is someone who carries malpractice insurance.
Because often the solution becomes the problem.
Cause only an expert can deal with the problem
Only an expert can deal with the problem
Only an expert can deal with the problem

Now sometimes experts look for weapons.
And sometimes they look everywhere for weapons.
And sometimes when they don’t find any weapons
Sometimes other experts say, “If you haven’t found any weapons
It doesn’t mean there are no weapons.”
And other experts looking for weapons find things like cleaning fluids.
And refrigerator rods. And small magnets. And they say,
“These things may look like common objects to you
But in our opinion, they could be weapons.
Or they could be used to make weapons.
Or they could be used to ship weapons.
Or to store weapons.”
Cause only an expert can see they might be weapons
And only an expert can see they might be problems.
Cause only an expert can deal with the problem
Only an expert can deal with the problem
Only an expert can deal with the problem

And sometimes, if it’s really really really hot.
And it’s July in January.
And there’s no more snow and huge waves are wiping out cities.
And hurricanes are everywhere.
And everyone knows it’s a problem.
But if some of the experts say it’s no problem
And other experts claim it’s no problem
Or explain why it’s no problem
Then it’s simply not a problem.
But when an expert says it’s a problem
And makes a movie and wins an Oscar about the problem
Then all the other experts have to agree that it is most likely a problem.
Cause only an expert can deal with the problem
Only an expert can deal with the problem
Only an expert can deal with the problem

And even though a county can invade another country.
And flatten it. And ruin it. And create havoc and civil war in that other country
If the experts say that it’s not a problem
And everyone agrees that they’re experts good at seeing problems
Then invading that country is simply not a problem.
And if a country tortures people
And holds citizens without cause or trial and sets up military tribunals
This is also not a problem.
Unless there’s an expert who says it’s the beginning of a problem.
Cause only an expert can deal with the problem
Only an expert can deal with the problem
Only an expert can deal with the problem

Only an expert can see there’s a problem
And see the problem is half the problem
And only an expert can deal with the problem
Only an expert can deal with the problem
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Old 14th April 2012, 08:50 PM   #19
Gyuri is offline Gyuri  Hungary
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I am not an expert unfortunately.
Nothing at all.
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Old 15th April 2012, 08:09 PM   #20
Gyuri is offline Gyuri  Hungary
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There was a slight improvement.
I have to consider, however, because at least it's not ruined.

https://public.bay.livefilestore.com...ilt.jpg?psid=1

https://public.bay.livefilestore.com...ont.jpg?psid=1

https://public.bay.livefilestore.com...ack.jpg?psid=1

https://public.bay.livefilestore.com...ink.jpg?psid=1
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