Date   

Re: Sony/Tek 318 Logic Analyser - parts needed

 

Hi Gala,
Please provide your contact information so interested members can get in touch with you directly and not through the list.
This will keep unnecessary personal business off TekScopes.
Note that you will have to spell out your email address since groups.io will alter it otherwise.
Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Gala Dragos via Groups.Io
Sent: Saturday, January 04, 2020 8:21 AM
Subject: [TekScopes] Sony/Tek 318 Logic Analyser - parts needed

Hi,
I am looking for an MPU & DISPLAY board for a Sony/Tektronix 318 Logic Analyser, mine is all messed up and difficult repair.
Please quote if you got any. I live in the EU.
Thanks




--
Dennis Tillman W7PF
TekScopes Moderator


Re: SG5030 and SG504 leveling heads

Melvin Gleep
 

I bit the bullet and bought one on Ebay (outch!). I will use your SG504 development as a guideline and see if I can come up with something as a substitute. If successful I might be able to resell it and get some of my money back.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Ancel
Sent: Freitag, 3. Januar 2020 17:21
To: TekScopes@groups.io
Subject: [TekScopes] SG5030 and SG504 leveling heads

I've considered doing a head leveling replacement for the SG5030, but without one on hand to develop on it has not happened. The SG504 head I made runs at nearly double the frequency range of the SG5030 so I imagine it is quite possible to develop.

The capital Investment for the SG5030 and the mainframe for it makes the exercise not a sustainable one so far, unless the replacement heads have some guaranteed sales.

My development of a SG504 head occurred because I own a SG504 and found that the David P's groundbreaking head kit was a bit difficult to assemble/use without an OEM head housing on hand (and also required an additional calibration step) . So offering a more compact, complete working head in a custom enclosure negated the need for the DIY calibration. Overall the community supported my efforts and the head I designed/built still sells occasionally (one every 2 months or so) online on EBAY, but I rarely promote it now as I have other products in the pipeline to manufacture.

However, never say never. I may have the opportunity one day to work with the SG5030.


Re: TDS694C 50 Ohm Overload

Reginald Beardsley
 

If it works on the higher setting, the problem is in the input section ahead of the ADC. I'd look for a burned 50 ohm resistor. Or perhaps a cracked solder joint.

I saw several of these on ebay with the SPC fail, but had been unable to find any information about what might be wrong with such a unit. How did you get the input damage information?

Reg


Tektronix 2465 for sale ...

rskrishnan@...
 

Hello All,
The new year has pushed me to realize that I am _never_ going to find time to poke around with my Tektronix 2465 :(
I'm happy to sell it to someone who might actually restore and _use_ it.
Details:
Tektronix 2465 oscilloscope. 4 channels, 300 MHz.
Reference info - http://w140.com/tekwiki/wiki/2465
The scope powers up fine, but POST shows that Test 05 fails with condition 42.
I think this is related to the horizontal sweep.
Most likely needs caps replaced - which is a typical problem with these scopes with age.
Scope is in good condition, display is fine, focuses well.
This could be a great scope if you are willing to spend time and replace caps.

I bought this for around $250 a few years back. Happy to sell this for something reasonable.
Please ping me for pics if you want to see it power up or the POST message.


Re: Tektronix 2245a Flickering Trace

Panos
 

I have read enough service manuals for the oscilloscopes, and till today I didn't find any of them to mention, that someone can use the same faulty scope (partially or totally) to repair his self.
But as always we can hope for something like that. After all, don't they say that hope dies always last? :-)

In my opinion if you have time to play then do it by that way. But if you want really to repair it, then proceed it with another oscilloscope.


Re: 465M Junker

Abc Xyz
 

Amen!

On Sat, Jan 4, 2020, 11:50 AM Jeff Woolsey <jlw@...> wrote:

On 1/3/20 7:39 PM, toby@... wrote:
On 2020-01-03 8:40 PM, KB6NAX wrote:
Here's the latest news on my junker 465M: The input FET's I ordered
came in. Three Siliconix old stock 2N5912's and one 151-1090-04 old
stock. I cobbled together Tek's 20 ohm totem pole circuit on a
prototyping board. I set the + and - 5 volt supplies precisely. All of
the FET's were well under 20 mV offset from 0 volts at the output.
...
douched the connectors with MG Chemicals Super Contact Cleaner and
reseated the connectors multiple times. Finally, the scope became
quiet. Twisting, tumbling and other forms of abuse yielded no more
noise problems. I'm gonna let the patient burn in for a while and
torture it some more before going into calibration mode. I'm not sure
I'm "there" yet.
These stories are fantastic and very educational to repair noobs like me.

Thankyou for posting it!

--Toby
Indeed. Really makes me want to drag my 455 up there so we can work on
fixing it, mostly for me to learn how.

--
Jeff Woolsey {{woolsey,jlw}@jlw,first.last@{gmail,jlw}}.com
Nature abhors straight antennas, clean lenses, and empty storage.
"Delete! Delete! OK!" -Dr. Bronner on disk space management
Card-sorting, Joel. -Crow on solitaire





Re: 465M Junker

Jeff Woolsey
 

On 1/3/20 7:39 PM, toby@... wrote:
On 2020-01-03 8:40 PM, KB6NAX wrote:
Here's the latest news on my junker 465M:  The input FET's I ordered
came in.  Three Siliconix old stock 2N5912's and one 151-1090-04 old
stock.  I cobbled together Tek's 20 ohm totem pole circuit on a
prototyping board.  I set the + and - 5 volt supplies precisely.  All of
the FET's were well under 20 mV offset from 0 volts at the output.
...
douched the connectors with MG Chemicals Super Contact Cleaner and
reseated the connectors multiple times.  Finally, the scope became
quiet.  Twisting, tumbling and other forms of abuse yielded no more
noise problems.  I'm gonna let the patient burn in for a while and
torture it some more before going into calibration mode.  I'm not sure
I'm "there" yet.
These stories are fantastic and very educational to repair noobs like me.

Thankyou for posting it!

--Toby
Indeed.   Really makes me want to drag my 455 up there so we can work on
fixing it, mostly for me to learn how.

--
Jeff Woolsey {{woolsey,jlw}@jlw,first.last@{gmail,jlw}}.com
Nature abhors straight antennas, clean lenses, and empty storage.
"Delete! Delete! OK!" -Dr. Bronner on disk space management
Card-sorting, Joel. -Crow on solitaire


Re: TDS694C 50 Ohm Overload

George Langston
 

Jay,
I agree, it is a Maxim device w/ Maxim p/n 155100101, and Tektronix number 156-8127-00. It has two in puts, one for <100mV settings and one for 200mV to 1.0V setting. The higher setting input is actually working and the lower setting input reads different input resistance than the other 3 channels and exhibits the stunted waveform.
I tried to reflow it (worth a shot, eh?) ... no such luck. Guess I'll shelve the TDS694C and watch for donor scopes. Alas ...

Thank you for your advice!

-George


Re: Tektronix 2245a Flickering Trace

Siggi
 

On Sat, Jan 4, 2020 at 8:00 AM William Schuler <guitardad1967@...>
wrote:

That makes me wonder – can you use a mostly functional scope to diagnose
itself?

I guess it depends, though a large section of this document (
https://www.sphere.bc.ca/test/tek-parts/troubleshooting-scopes.pdf) is
about "Front-Panel Diagnosis" which largely interrogates the instrument
about its own faults. You can - to a point - use a scope to look at its own
power supply ripple and the like, and *some* of its internal state, like
some portion of the sweep ramp(s). I guess it can be hard to know what to
believe when the instrument itself is faulty.
This scope also has a service mode with some self-diagnosis capability. You
can get the service manual from here (http://w140.com/tekwiki/wiki/2245),
see page 6-10 for the service menu.

Also note that every scope has two built-in "signal sources"; the
calibrator and GND coupling, and most scopes have an additional trigger
signal which is the line. You can also think of AUTO trigger mode and the
holdoff as trigger signals. Then there's X/Y mode, which allows you to
introduce a calibrated signal to the horizontal circuitry. In your case, it
might be interesting to inject DC on the X, and e.g. a sine or triangle
wave on the Y. It might also be interesting to play with line triggering to
see whether the glitching is line-synchronous, which could happen if e.g.
you have excessive line ripple on a supply ... time passes ... these scopes
have a switch-mode power supply, so more likely power supply noise or
ripple will be at the switching frequency.

If it comes to it my friend has a scope for use.


That'll certainly be an easier way to go :). If you poke around in the
power supply, be very, very careful, as everything except the final
low-voltage supplies are line-referenced.

Good luck and much fun,
Siggi


Re: Sony/Tek 318 Logic Analyser - parts needed

Dave Seiter
 

What's your email address?  I have a unit that functions, but throws a memory error upon self test.
Dave
d.seiter at att dot net

On Saturday, January 4, 2020, 08:21:35 AM PST, Gala Dragos via Groups.Io <gala_dragos=yahoo.com@groups.io> wrote:

Hi,

I am looking for an MPU & DISPLAY board for a Sony/Tektronix 318 Logic Analyser, mine is all messed up and difficult repair.

Please quote if you got any. I live in the EU.

Thanks


Re: Tektronix 2245a Flickering Trace

Panos
 

On Sat, Jan 4, 2020 at 02:59 PM, William Schuler wrote:

That makes me wonder – can you use a mostly functional scope to diagnose
itself?
I think that already I see the Star Trek to arriving as to save the earth after this!!!


Sony/Tek 318 Logic Analyser - parts needed

Gala Dragos
 

Hi,

I am looking for an MPU & DISPLAY board for a Sony/Tektronix 318 Logic Analyser, mine is all messed up and difficult repair.

Please quote if you got any. I live in the EU.

Thanks


Re: Tek 2710 SA error: Unable to delete files at startup

Rogerio O
 

Thank you very much for the information!
I will try the fix and post the results.
It will take some time since I have other projects going on right now.


Re: 130 LC meter

Jean-Paul
 

Hi there, I have a working unit and last used, perhaps 5 yrs ago. I could unearth it.

My first suspects would be the electrolytic caps in the PSU and any paper or oil caps. The micas seldom fail.

Of course the tubes should be checked first!

The modern LCR meters are so small and accurate, the 130 is really a museum piece!

Enjoy,

Jon


Tek514D Blows Fuse

Steve Hendrix
 

My dad is a long-retired EE, and no longer able to do a lot of electronics. But we are enjoying a chance to work together, where I can be his eyes and hands while he shares his knowledge of ancient (to me) history. I'm a practicing EE today, but my knowledge of tubes is mostly theoretical. I live about an hour away from him, so need to be sure I take along everything I need when I visit. So there's the picture.

Yesterday I attended a funeral for a high school classmate of mine, and took the opportunity afterwards to visit Mom & Dad to tinker some more with another instrument (to be discussed on the HP group). I didn't have my scope along and found that we needed one, so fired up his Tek514D. Not so much, this first try - no line fuse installed. We couldn't find any reference for the correct fuse (I've since found it, a 5A slo-blo) and the only one we had handy was a 20A - the house circuit breaker will protect that! But we tried it anyway. Power switch on, pilot light lights, fans run.....maybe 20 or 30 seconds, then all dark. Yup, the fuse is more than clearly blown.

Based on discussions here and on the HP group, I'm suspecting deteriorated electrolytic caps in the power supply. I found a schematic on the Bama site. It appears that Tek liked to just stock one size (20 µF) and use them in parallel where more capacitance was needed. I assume that those probably need at least a 630V rating. We didn't have time to open up the scope, as I had to attend to several household repairs while there. Can anyone guide me as to what physical size is going to fit, and even get so specific as to what to order from DK? I have a large stock of capacitors of all sizes, but very limited on high-voltage types as I mostly work at 24VDC and below these days. Any other tips as to how to tackle this?

One other question as well. I recognize the schematic symbols for triodes, tetrodes, and pentodes. But they use an unfamiliar symbol several times in the schematic of the power supply. Sometimes two plates on opposite sides of a circle, with a little hook entering 90º from the plates (similar to the cathode symbol in the tubes). Sometimes the two plates are side-by-side, with the hook directly opposite them. What is that? Based on the way they're used in the schematic, I'm speculating that they're diodes. (?)

Steve Hendrix


Re: Tektronix 2245a Flickering Trace

William Schuler
 

“Do you have a second scope you could turn on
your 2245A?

Siggi”

That makes me wonder – can you use a mostly functional scope to diagnose
itself? Or could that be catastrophic, like creating tears in the
time/space continuum when messing around with time machines? ; )

If it comes to it my friend has a scope for use.

On Thu, Jan 2, 2020 at 11:22 PM William Schuler via Groups.Io
<guitardad1967=gmail.com@groups.io> wrote:

Thanks for narrowing it down guys. I will look into it this weekend. I
could take it over to my buddies house who has a scope...

On Thu, Jan 2, 2020 at 8:54 PM KB6NAX <gumbear@...> wrote:

Yup, I have to agree with Siggi. The "OSD," meaning the vertical
sensitivity callout in the lower left hand corner and the sweep time in
the
lower right hand corner also are jumping sideways along with the
sine wave. So the jitter is occurring in the horizontal amplifier chain,
not
the triggering circuit. With power off, carefully reseat anything that
plugs in.
Don't slip up and plug anything back in wrong that you pulled out - no
bent
pins, etc.

Arden


I think it's safe to say that you have more than just a triggering
issue,
as your OSD (on-screen display) is jumping around as well as the traces
(see e.g. around here https://youtu.be/j6Dqke1CIRE?t=74). This could be
as
simple as a marginally plugged-in connector somewhere, but you should be
looking at points common to the OSD and sweeps. This includes power
supplies and e.g. the horizontal amplifier. Your vertical appears
unaffected, however.
If you haven't read this:
https://www.sphere.bc.ca/test/tek-parts/troubleshooting-scopes.pdf
already,
you may want to take a gander. Do you have a second scope you could turn
on
your 2245A?

Siggi <







Re: TDS694C 50 Ohm Overload

 

Hi George,

I believe that is the input preamp, not the ADC. There's a good possibility that someone overloaded and killed it. They are BGA devices so they're not very repairable without a donor board and re-balling.


Re: Anyone ever heard of a 535-S6 model Tek scope?

Jamie Ostrowski
 

Interesting find, John. Thanks. I noticed it is in the earlier style case,
too.

On Fri, Jan 3, 2020 at 9:43 PM John Williams <books4you@...> wrote:

The 535-s6 listing should say

1.5 microseconds to 10 seconds for the delay spec.




Re: What you may not know about the creator of Groups.io

Jim Ford
 

Hi, Dennis.You do have to click on the Did You Mean link on Wikipedia.  Your link below doesn't go directly, FYI.Mark's blog was far too software-oriented for a hardware guy like me.  Although I am trying to learn Python so I can control my test equipment via GPIB and USB.  That's not proceeding very rapidly, though.Oh well.Jim Ford Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------From: Dennis Tillman W7PF <@Dennis_Tillman_W7pF> Date: 1/3/20 7:23 PM (GMT-08:00) To: TekScopes@groups.io Subject: [TekScopes] What you may not know about the creator of Groups.io Mark Fletcher has a long history developing very successful softwareapplications.I frequently get a reply from him to questions I ask or to features we wouldlike to see added to TekScopes.Contrast this with Yahoo groups where it was impossible to call, email, senda letter, or walk into an office to request assistance. There was no way toknow if there were still humans involved or was it running all by iteself.This Wikipedia link will tell you a little more about Mark. It is a quickread.https://en.wikipedia.org/wiki/Mark_Fletcher_(businessman)This is the link to Mark's Blog. You can spend as much time as you wantreading about the fascinating things he has been involved in and developed.One of Marks earlier creations was acquired by Yahoo in 2000 and becameYahoo Groups. If you scroll down, almost to the bottom (Sept. 23, 2014) youcan read the introductory announcement of his latest creation, Groups.io,which he created because, as he puts it, "Yahoo Groups and Google Groupsboth exude the dank air of benign neglect."https://wingedpig.com/Dennis Tillman W7PF-- Dennis Tillman W7PFTekScopes Moderator


Re: Anyone ever heard of a 535-S6 model Tek scope?

John Williams
 

The 535-s6 listing should say

1.5 microseconds to 10 seconds for the delay spec.