Date   

Re: 7834 Missing Trace

sdferg7@...
 

Unfortunately the problem is just that. I can get a trigger light on both of the horizontals, with the display set to either CH1/CH2 or chop, but there is still no trace. With the side panels off I made a cursory inspection of the boards and the only thing unusual I could find was a capacitor with a strange glassy blue substance on top of it. I presume it is leakage, but I haven't seen one leak like this before. It is on the A25 storage board just behind the fan, so I'm not sure if that could be related. From what I can tell from the troubleshooting manual I think the problem is either in the CRT, the horizontal, or the PSU. I did notice the night before that in certain settings the display would flicker a bit, but as it warmed up the problem seemed to dissipate. Hoping the whole scope didn't become trash the day after I bought it, haha.

Here is an image of the capacitor: https://imgur.com/a/5a6zVPd

Shane


Re: Preventing SPAM from new members

Tom Gardner
 

The occasional spam doesn't bother me, so I'd encourage Dennis (et al?) to choose whatever mechanism is least work for themselves.

It isn't just mask guys; electronic components as well :(  I've seen them ask questions with appropriate terms and sentences, but with paragraphs that indicate either complete beginner or not an English speaker.

Their followups to responses are either non-existent or complete rubbish.

On 04/08/20 15:01, Vince Vielhaber wrote:
These mask guys have been doing this on other groups.  Dennis is 100% correct in his new policy.  They ask some question, usually a how-to, and get approved.  Then after they're approved here it comes.  I've seen them in machining groups asking the same questions but using terms that are more apropos to the group.

Vince - K8ZW.


On 08/04/2020 04:37 AM, David C. Partridge wrote:
I didn't raise the point at the time, and 'm really not trying to tell you
"how to suck eggs":   Did you check with the person involved? It is
possible that his email had been hi-jacked, and that he wasn't the spammer.

Why do I say this - it happened to me a long time ago to a different email
from the one I now use.   Not much spam was sent and I was not (luckily)
banned anywhere.

David

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Dennis
Tillman W7pF
Sent: 04 August 2020 01:24
To: TekScopes@groups.io
Subject: [TekScopes] Preventing SPAM from new members

Prior to the SPAMMER I accepted and approved as a member a few weeks ago
anyone who wanted to post a message to TekScopes had to be approved by me. I
read each of their pending messages to be sure they passed my "smell" test.
If they did, then I approved them as a member and unmoderated them at the
same time.
Unfortunately spammers are now getting better at hiding their intentions and
it is becoming harder to separate them from legitimate future members.
From this point forward I will no longer be un-moderating new members
automatically. I apologize in advance for any inconvenience this may cause
new members.
Thanks to the member who alerted me to that spammer he was immediately
banned, all of his posts were removed, and all of the posts by others in
response the topic(s) he initiated were removed.

Dennis Tillman W7pF





Re: Why would you do this?

Michael W. Lynch
 

On Tue, Aug 4, 2020 at 09:51 AM, Paul Amaranth wrote:


What are the alternatives? Ebay was great in the early days; I got a ton of
useful equipment. Not so great these days and I'd love to go somewhere
else.
Paul,

Me Too!

A "needs repair" 465 with no trace, busted up knobs and that looks like it came out of a dumpster; priced at $200 + $100 shipping is too rich for me.

Viable Alternates anyone?

--
Michael Lynch
Dardanelle, AR


Re: FG502

Roger Evans
 

The fine adjustment knob gives about a factor of ten improvement in the precision with which you can set the frequency measured against a DC503 counter. The only reason that comes immediately to mind is that it would help to give an almost static Lissajous figure in XY mode against some other generator. Any other ideas?

Roger


Re: Why would you do this?

Harvey White
 

There is a "test equipment for sale" group.  Certainly more limited than Ebay in audience, but you are likely to get people who are more interested in the equipment rather than tube robbers.

Harvey

On 8/4/2020 10:51 AM, Paul Amaranth wrote:
What are the alternatives? Ebay was great in the early days; I got a ton of
useful equipment. Not so great these days and I'd love to go somewhere
else.

Paul

On Tue, Aug 04, 2020 at 07:43:22AM -0700, Michael W. Lynch via groups.io wrote:
On Tue, Aug 4, 2020 at 09:28 AM, Dick Wilson at DiLette Sales wrote:

In case anyone is unaware, eBay has now cut Paypal out and is forcing it's
members to give their financial info to a foreign company or the accounts will
be closed.
When or If this happens to me, I will also be out. I am only a "small potatoes" seller, but I will not submit my information to a foreign bank, just to stay on E-Bay. PayPal is its own boatload of pirates, but they are my pirates. E-Bay has become more and more difficult to justify as a seller over the years. The rules of use are indeed arbitrary and in some cases even draconian.

--
Michael Lynch
Dardanelle, AR





!DSPAM:5f29741362092081140317!


Re: AWG2005 Issues and Repair Question.

Michael W. Lynch
 

On Tue, Aug 4, 2020 at 09:41 AM, Stephen wrote:


Stephen 3:40am #170085

I’ve read somewhere, maybe TekWiki, that when working on these
digital/analog “hybrid” scopes, you could fry a chip within a few minutes
if it’s open and not properly cooled. I don’t know if this applies here
though.
Stephen,

Yes, I have a 2440 and that is one of the scopes that must be constantly cooled to prevent overheating of the A/D Converters and the CCD Hybrids. I think that Martin makes a good point, even if the problem might be less catastrophic on the AWG series. That noisy fan is there for a reason.

--
Michael Lynch
Dardanelle, AR


Re: Why would you do this?

Paul Amaranth
 

What are the alternatives? Ebay was great in the early days; I got a ton of
useful equipment. Not so great these days and I'd love to go somewhere
else.

Paul

On Tue, Aug 04, 2020 at 07:43:22AM -0700, Michael W. Lynch via groups.io wrote:
On Tue, Aug 4, 2020 at 09:28 AM, Dick Wilson at DiLette Sales wrote:


In case anyone is unaware, eBay has now cut Paypal out and is forcing it's
members to give their financial info to a foreign company or the accounts will
be closed.
When or If this happens to me, I will also be out. I am only a "small potatoes" seller, but I will not submit my information to a foreign bank, just to stay on E-Bay. PayPal is its own boatload of pirates, but they are my pirates. E-Bay has become more and more difficult to justify as a seller over the years. The rules of use are indeed arbitrary and in some cases even draconian.

--
Michael Lynch
Dardanelle, AR





!DSPAM:5f29741362092081140317!
--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@... | Unix/Linux - We don't do windows


Re: Why would you do this?

Michael W. Lynch
 

On Tue, Aug 4, 2020 at 09:28 AM, Dick Wilson at DiLette Sales wrote:


In case anyone is unaware, eBay has now cut Paypal out and is forcing it's
members to give their financial info to a foreign company or the accounts will
be closed.
When or If this happens to me, I will also be out. I am only a "small potatoes" seller, but I will not submit my information to a foreign bank, just to stay on E-Bay. PayPal is its own boatload of pirates, but they are my pirates. E-Bay has become more and more difficult to justify as a seller over the years. The rules of use are indeed arbitrary and in some cases even draconian.

--
Michael Lynch
Dardanelle, AR


Re: AWG2005 Issues and Repair Question.

Stephen
 

Stephen 3:40am #170085

I’ve read somewhere, maybe TekWiki, that when working on these digital/analog “hybrid” scopes, you could fry a chip within a few minutes if it’s open and not properly cooled. I don’t know if this applies here though.


Re: AWG2005 Issues and Repair Question.

Michael W. Lynch
 

On Tue, Aug 4, 2020 at 09:20 AM, Martin Hodge wrote:


Make sure that the fan in yours is working 100% and really moving air. It's
loud but absolutely necessary.
Martin,

One thing that I am certain of, that fan is working. It sounds like a jet engine next to my 465B. That being said, overheating or issues with the ECL chips could still be a problem. The problem is, how to find the offending component? This sounds like the proverbial "needle in the haystack" exercise. I have been careful to maintain airflow with the case off. Perhaps looking for a "hot" or "cold" chip on the boards might be a clue, one or more chips that are much hotter or cooler than their neighbors?

--
Michael Lynch
Dardanelle, AR


Re: Why would you do this?

Dick Wilson at DiLette Sales <cmdrdick42@...>
 

In case anyone is unaware, eBay has now cut Paypal out and is forcing it's members to give their financial info to a foreign company or the accounts will be closed.They are ramping that up in groups to be complete by the end of 2020.How does that affect you? Well, you won't be able to use Paypal for purchases or sales. As an eBay seller since they first started up, I have gone from a lover to a hater, because of the way that eBay arbitrarily forces new changes on members.
In the beginning, we sold hundreds of thousands of dollars worth of electronic equipment. These were mostly sourced from the government (bid on a container) auctions before Government Liquidation.com became the only Mil surplus outlet. Once those guys started selling on their own site, the profit potential disappeared. Well, back to the point.
Today, I despise eBay, to the point of making up new cuss-words. We invested tons of money in programming for automatic handling of our sales thru Paypal. Now, all of that code is worthless.On July 15th, we closed all of our eBay accounts. Good riddance.
I am now retiring (at 78) and still have 30 skids of used electronics and a huge manuals library. I'll be donating the library to the WiKi and selling off the stuff wherever I can find interest.
Change is the only constant.
CmdrDick

On Monday, August 3, 2020, 11:23:41 PM EDT, Dave Seiter <d.seiter@...> wrote:

Ebay has been taking a shipping cut for years (not sure how long, probably around 2012?).  I stopped selling scopes because of that, as $120 shipping on an item that might sell for $35 isn't worth the effort (and properly boxing up Tek scopes requires effort!)
-Dave
    On Monday, August 3, 2020, 01:54:55 PM PDT, David Berlind <david@...> wrote:

I would say that while it's true that not ALL ebay sellers are padding
their revenue through exorbitant shipping fees, the pattern is bad enough
from eBay's perspective that the shipping cost is now included in eBay's
math for the cut it takes from a sale. This used to not be the case and was
almost certainly a response to sellers gaming the system. I remember going
on eBay and seeing things that I was interested in for exceedingly low Buy
it Now prices. Then, I became hip to how the sellers were making it up on
the shipping price because eBay wasn't taking a cut of that. Well, now they
do. For documentation, the shipping should be super cheap thanks to USPS
media mail.


On Mon, Aug 3, 2020 at 4:23 PM Dave Seiter <d.seiter@...> wrote:

  Ebay sellers most certainly do not all "make some money" on packaging and
shipping!  In fact, since ebay final value includes any shipping cost, they
are actually losing money on shipping unless they are hugely padding the
shipping amount (and some do, but it seems to mostly be brick and mortar
stores with an additional ebay storefront that do so, and the people who
think their $20 item is worth $300).
I never pad the cost of shipping, charge for materials (unless the buyer
wants something specific that I don't already have), and I refund excess
shipping fees when they occur (if more than a few cents).  That's usually
due to a listing with fixed shipping that gets purchased by someone local.
I also never use stock photos- like you say, it's asking for trouble unless
the item is still shrink wrapped.
-Dave
    On Monday, August 3, 2020, 12:51:04 PM PDT, Roy Thistle <
roy.thistle@...> wrote:

  On Sat, Aug  1, 2020 at 09:58 AM, Dennis Tillman W7pF wrote:


So why would he want to take additional photos for a manual he is
selling for
$15.00. I thinking he is doing any member who has a P6042 probe a favor
by
offering it at all.
Hi Dennis:
It's refreshing to read your post... since I tend to be cynical about Ebay
sellers (and Crag's List et. al. sellers too.)
IMHO 20USD is a good bit! (lt's more than millions, maybe 10s of millions
of Americans make in an hour, or even 2 hours.) Thus, for a few minutes
work, the seller probably made about  20.00USD. Not Bad, for something
he/she got from a dumpster! The seller made some money on the
shipping/packing too!... they always do! And, the seller already has an
Ebay store... selling toy ships, and shoes, and candle wax... even selling
tomatoes, but not kings.
Ebay has copious warnings about buying items based on cropped, or single
photos, or even stock photos... and though I am not a Ebay seller..listing
items, with such pics, leaves a seller wide open for someone to file a
case  against them, for "not as shown/described."
Lastly, how much time does it take to push the camera button, a couple
more times, to get good documentation!... and why don't some sellers do
that?
Best regards and wishes.
Roy






Re: AWG2005 Issues and Repair Question.

Martin Hodge
 

I worked on a awg2021 and I'll bet your problem is overheating. The 2000 series uses ECL logic and those chips get extremely hot! With the cover off be sure to always place a good powerful fan pointing at the card cage on the right side of the unit. When I worked on mine I sat it on its left side and rested a 12v PC fan on top of it pointing down. Make sure that the fan in yours is working 100% and really moving air. It's loud but absolutely necessary. It should draw air in through the holes in the back-right of the cowling, through the length of the card cage to the front, across to the CRT unit and power supply on the left and out the left-rear.


Re: Message to satbeginner and Saroj Pradhan re: Tektronix 2230

Stephen
 

On Tue, Aug 4, 2020 at 03:09 AM, David Kuhn wrote:


..and I was interested in their experience winding the transformer. I
would never have the patience for that myself!

Dave
I personally would love to know how, and wind transformers too. Very interesting stuff indeed.


Re: Message to satbeginner and Saroj Pradhan re: Tektronix 2230

David Kuhn
 

..and I was interested in their experience winding the transformer. I
would never have the patience for that myself!

Dave

On Mon, Aug 3, 2020 at 9:55 PM Chuck Harris <cfharris@...> wrote:

Dennis,

Are you serious? Why is the 2230 not worthy of long threads,
but every damn thing else is?

Yes, it is bit of a chit/chat fest, but the messages all seem
to me on topic. Bandwidth (ha ha!) is minimal, perhaps less
than 40K for the entire thread.

I admit that I care nothing for the 2230, but others do.

So, why?

-Chuck Harris



Dennis Tillman W7pF wrote:
Gentlemen:
You are creating an excessive amount of unnecessary message traffic,
consuming significant bandwidth, and taking up precious storage on
TekScopes.
I believe the best way for you to explore your mutual interests
regarding the 2230 is to communicate directly to each other rather than
through TekScopes.
If you need further assistance please contact me directly.
Thank you,
Dennis Tillman W7pF







Re: Preventing SPAM from new members

Vince Vielhaber
 

These mask guys have been doing this on other groups. Dennis is 100% correct in his new policy. They ask some question, usually a how-to, and get approved. Then after they're approved here it comes. I've seen them in machining groups asking the same questions but using terms that are more apropos to the group.

Vince - K8ZW.

On 08/04/2020 04:37 AM, David C. Partridge wrote:
I didn't raise the point at the time, and 'm really not trying to tell you
"how to suck eggs": Did you check with the person involved? It is
possible that his email had been hi-jacked, and that he wasn't the spammer.

Why do I say this - it happened to me a long time ago to a different email
from the one I now use. Not much spam was sent and I was not (luckily)
banned anywhere.

David

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Dennis
Tillman W7pF
Sent: 04 August 2020 01:24
To: TekScopes@groups.io
Subject: [TekScopes] Preventing SPAM from new members

Prior to the SPAMMER I accepted and approved as a member a few weeks ago
anyone who wanted to post a message to TekScopes had to be approved by me. I
read each of their pending messages to be sure they passed my "smell" test.
If they did, then I approved them as a member and unmoderated them at the
same time.
Unfortunately spammers are now getting better at hiding their intentions and
it is becoming harder to separate them from legitimate future members.
From this point forward I will no longer be un-moderating new members
automatically. I apologize in advance for any inconvenience this may cause
new members.
Thanks to the member who alerted me to that spammer he was immediately
banned, all of his posts were removed, and all of the posts by others in
response the topic(s) he initiated were removed.

Dennis Tillman W7pF




AWG2005 Issues and Repair Question.

Michael W. Lynch
 

I recently obtained a SONY/TEKTRONIX AWG2005. It had a couple of issues. First the power supply would quit working after it warmed up for about 30 minutes and would not restart until it cooled overnight. After I replaced the power supply, I was able to start the unit and leave it running overnight, so the supply was now "good".

Currently, the unit powers up normally, goes through the startup routine and passes all the Self-Tests with flying colors. Never shows an error code upon start up. The display is bright an clear, every function and control appears normal. Unfortunately, it only works properly for a few minutes then keyboard response to each button press seems to first slow down and finally freezes up for lack of a better word. It does not shut down, it simply stops responding to all front panel commands. I must unplug the power cord and then restart, it will repeat the entire process again.

I have pulled all the boards and looked for obvious signs of corrosion or other damage. There appear to be no leaky caps and the thing only uses a very few electrolytic caps (excluding the powers supply). I do not see any chips that are in sockets, everything seems to be soldered directly to the PC boards, as you would expect. No signs of any previous repairs. All the boards appeared to never have been disturbed before I removed them for inspection. I have also re seated all the ribbon cable and other inter-board connectors, again, there does not appear to be any visible problem with these.

Anyone have an idea of where I should start looking? I have very little experience with these digital devices, I can find my way around an older analog scope and a schematic, but this is a different animal.

Thanks!
--
Michael Lynch
Dardanelle, AR


Re: Triggering problem with TDS6604

guy_ellis_1964
 

Hi Jim,
I found the cause of the trigger problem with my TDS6604.
It was the trigger chip - luckily we have an SMD repair station at my work -> they are not too hard to replace if you have hot air.
The hard part is to find a source of the chips.
Regards,
- Guy.


Re: Preventing SPAM from new members

ArtekManuals <manuals@...>
 

There is a TekScopes2 already and they are more agreeable to having off topic conversations. I for one would appreciate it if you took this over there

Log into Groups.IO and search on TEKSCOPES 2
Dave
ArtekManuals

On 8/4/2020 6:03 AM, Carsten Bormann wrote:
On 2020-08-04, at 11:57, Stephen <stephen.nabet@...> wrote:
I was only born 20 years later, in 1966, but I do remember the US Corned Beef rations we could still buy (new) surplus of, from the grocery store. Is this what you’re referring to?
I plead GUILTY AS CHARGED (yes, all upper-case).

Sorry for bringing this (admittedly interesting) subject up.
This thread was about “Preventing [email] spam”, not finding variants of SPAM.
Please…

(There needs to be a Tekscopes2 where we can continue these off-topic (*) threads…)

Grüße, Carsten

(*) https://en.wikipedia.org/wiki/Senate_Reserve


--
Dave
Manuals@...
www.ArtekManuals.com
--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus


Re: Preventing SPAM from new members

Carsten Bormann
 

On 2020-08-04, at 11:57, Stephen <stephen.nabet@...> wrote:

I was only born 20 years later, in 1966, but I do remember the US Corned Beef rations we could still buy (new) surplus of, from the grocery store. Is this what you’re referring to?
I plead GUILTY AS CHARGED (yes, all upper-case).

Sorry for bringing this (admittedly interesting) subject up.
This thread was about “Preventing [email] spam”, not finding variants of SPAM.
Please…

(There needs to be a Tekscopes2 where we can continue these off-topic (*) threads…)

Grüße, Carsten

(*) https://en.wikipedia.org/wiki/Senate_Reserve


Re: Preventing SPAM from new members

Stephen
 

On Mon, Aug 3, 2020 at 10:47 PM, Colin Herbert wrote:


As far as I remember (I was only born in 1946, though)
I was only born 20 years later, in 1966, but I do remember the US Corned Beef rations we could still buy (new) surplus of, from the grocery store. Is this what you’re referring to?