Date   

Re: 465 stopped working

Carl Miles
 

I am new to the group but an old electronics tech and I would probably say that you are looking at some capacitors reaching the end of their useful lives. Some of the tantalums used in this time period have a tendency to go bad and short out, luckily in your case it popped the fuse. Sometimes they don’t and continue to burn out and make lots of smoke and along with an awful smell. Could be some electrolytic(s) as well. I am sure someone more versed in the 465 specifically will have some more suggestions. Might want to start with a few googles on tek 465 won’t power on or something similar or there might be something on the board here that you could search for as well. Maybe even a youtube on someone who has refurbished a 465 back to “new” would shed some light on things you might want to look into doing on your 30 or 40+ year old equipment.

Regards,

Carl

Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

From: harris.newton@...<mailto:harris.newton@...>
Sent: Tuesday, March 10, 2020 4:49 PM
To: TekScopes@groups.io<mailto:TekScopes@groups.io>
Subject: [TekScopes] 465 stopped working

Hi,

I recently acquired a 465 scope which worked beautifully for my amp building projects. I stored it on it's end (if that has any significance) for a few days whilst I built a new shelf for it. I placed it on the shelf turned on, I'm sure I heard a slight noise and the beam disappeared. Investigating I found fuse 1437 (2A) had blown.
What are the first things to check and how?

I am not used to working on oscilloscopes but have the schematic which I can read so any pointers to get this lovely machine back to life would be appreciated.

Newton


Re: I've been hacked

Roy Thistle
 

On Wed, Mar 11, 2020 at 11:43 AM, Abc Xyz wrote:


Best Buy & let the Geek Squad Remove
In my opinion... because of experience, "Danger Will Robinson. Danger!" … but, one's mileage may vary.
Someone once told me don't use grandma's best china to feed a room full of chimpanzees... but, I recon now that I know better paper plates would be okay.
Roy.


Re: I've been hacked

Chuck Harris
 

Geek Squad "technicians" get paid by the FBI to take
special training courses on finding and identifying
hidden pornography, and illegal documents. They get
paid a bounty for every suspicious thing they turn
in to the FBI.

That's unconstitutional, you say?

No, it isn't. They are a private entity, and you have
to sign a waiver that gives them permission to search
for such stuff before they will work on your computer.

Anything they find, they will send right out to the FBI
for evaluation...

Best not use Geek Squad for any computer that has been
involved with anything you wouldn't want to see in the
Washington Post.

Also, a lot of the spam payloads turn your windows machine
into child pornography servers.

If Geek Squad finds that, you will get to spend a few
weeks in jail.

Me personally, if Geek Squad was my only choice, I would
remove and destroy the drive, and put a new install of
windows on a new drive, and shrug my shoulders for being
stupid enough to use Windows, and stupid enough not to
make off machine backups...

-Chuck Harris

Abc Xyz wrote:

I took my Infected Units over to Best Buy & let the Geek Squad Remove the
Virus's. They have Access to Tools we can't get. Plus, they Installed their
own Detection Software.


Re: I've been hacked

Abc Xyz
 

I took my Infected Units over to Best Buy & let the Geek Squad Remove the
Virus's. They have Access to Tools we can't get. Plus, they Installed their
own Detection Software.

On Wed, Mar 11, 2020, 9:53 AM <tekscopegroup@...> wrote:

Your computer was infected by a trojan that looks for contacts in email
programs and converts your machine into a spam sending zombie. It might
possibly also be looking for other interesting information like any
exposed banking/financial info, etc. Its important to stop using the
computer until you are sure its once again clean. You most probably visited
a compromised website and your browser allowed it to be planted on your
machine, without even having to do anything or click on any links. Just
visiting the website with a weakly secured browser is usually all that is
needed to get infected. Or you may have clicked on the wrong email link,
such as the one on the emails your machine is now sending out trying to
spread the infection and that will surely take you to a website as
described before.

I would not bother or even trust much in all the commercial anti-virus
stuff that's out there nowadays, most are just bloated and not very
effective means of securing a computer, and mostly give a false sense of
security, specially since a few years ago where some things have radically
changed on the Internet and the way infections are spread, and new means of
"bad stuff" staying hidden from most scanners. In the end nothing beats
common sense and safe security practices, plus an up to date system with
all sec patches in place. Also get the right plug-in/add-ons for your
browser to make it safer, and avoid anything with MS or IE in the name.
Regular system backups can easily save the day if nothing else works.

And unless you know what you are doing don't bother scanning or running
magic stuff looking for quick solutions to remove the infection. If you
have a recent system backup it might be worth using it. There might even be
a dedicated removal tool out there but first you need to know what your
computer is infected with.

Instead head over here and ask for help:

https://www.bleepingcomputer.com/forums/f/22/virus-trojan-spyware-and-malware-removal-help/





Re: Viewing hoods for 7000 series

Mlynch001
 

I am printing a sample as I type. Should be done this afternoon late. I am printing in TPU, so it will be slightly flexible. I already had the printer set up for TPU, so it should be a good test for this item. I normally use PETG and have printed many of these for other scopes in that material.

--
Michael Lynch
Dardanelle, AR


O/T Need help finding a manual for Noiseken FVD-1000

 

I have wanted on of these high performance EMI sniffers for years, and finally got one, appears working with all the probes. sadly, no manual, so I am not sure how to interpret the display with different probes. ANY help appreciated, there's nothing anywhere on the web I can find, and it's gone from the noiseken website.

I really wish I had one of these when I was knee deep in complicated avionics design, it really would have been useful.

all help truly appreciated,
best regards,
walter (walter2 -at- sphere.bc.ca)
sphere research corp.


Re: 465 stopped working

toby@...
 

On 2020-03-11 5:39 AM, harris.newton@... wrote:
I can't believe it, the model is the 454 NOT the 465! Not sure if I should start a new thread with the correct model number. Apologies.
That seems like the right thing to do. Maybe you can reply to Roger's
informative reply so that gets filed correctly :)

--Toby




Re: 465 stopped working

Roger Evans
 

F1437 on the Tek 454 is the 2A fuse in the unregulated low voltage supply to the HV oscillator. Likely failures are C1437 failing short circuit, Q1430 or Q1423 (the power transistor and its driver) failing collector emitter short circuit, or failure in the high voltage side including the transformer T1430. Failures on the high voltage side (capacitors and diodes) are more difficult to trace since they really need to be tested at voltages much higher than a typical multimeter. If you find any of the above failures on the low voltage side then I would try one good replacement and if that fails immediately then you need to look further down the line. C1437 and the transistors do just fail from old age so you may well be lucky and find the fault there.

Good luck,

Regards,

Roger


Re: I've been hacked

tekscopegroup@...
 

Your computer was infected by a trojan that looks for contacts in email programs and converts your machine into a spam sending zombie. It might possibly also be looking for other interesting information like any exposed banking/financial info, etc. Its important to stop using the computer until you are sure its once again clean. You most probably visited a compromised website and your browser allowed it to be planted on your machine, without even having to do anything or click on any links. Just visiting the website with a weakly secured browser is usually all that is needed to get infected. Or you may have clicked on the wrong email link, such as the one on the emails your machine is now sending out trying to spread the infection and that will surely take you to a website as described before.

I would not bother or even trust much in all the commercial anti-virus stuff that's out there nowadays, most are just bloated and not very effective means of securing a computer, and mostly give a false sense of security, specially since a few years ago where some things have radically changed on the Internet and the way infections are spread, and new means of "bad stuff" staying hidden from most scanners. In the end nothing beats common sense and safe security practices, plus an up to date system with all sec patches in place. Also get the right plug-in/add-ons for your browser to make it safer, and avoid anything with MS or IE in the name. Regular system backups can easily save the day if nothing else works.

And unless you know what you are doing don't bother scanning or running magic stuff looking for quick solutions to remove the infection. If you have a recent system backup it might be worth using it. There might even be a dedicated removal tool out there but first you need to know what your computer is infected with.

Instead head over here and ask for help:
https://www.bleepingcomputer.com/forums/f/22/virus-trojan-spyware-and-malware-removal-help/


Re: 465 stopped working

Mlynch001
 

Model, serial number and the proper TEKTRONIX Manual are your best friend. I do not have and have not worked on a 454, so I have no working experience of that unit. I have heard that HV transformers are a major failure point on that series. There should be Plenty of discussion on this forum about the 454, do a search of the forum and see if anything pops up. Best of luck to you.

--
Michael Lynch
Dardanelle, AR


Re: I've been hacked

Geoffrey Thomas
 

If you're worried about cryptomalware then this is a useful program - Cryptoprevent. I have no interest in this except I have it installed:

https://www.d7xtech.com/cryptoprevent-anti-malware/free-edition/

The free edition is no longer being updated.

Geoff.

On 11/03/2020 02:00, Eric wrote:
Hey Rich,
    Avast is good as far as I know. You technically don't "need" to get rid of defender as it is a built and I think I broke windows badly when I tried to remove it last and most AV will coexist with it. Malware bytes is not AV so it does not tank performance and can be on with other programs.
To All of us here have some irraplaceable data be it digital data books, schematics and repair manuals. Crypto malware is the nastyest thing out at the moment PLEASE PLEASE PLEASE have an off line backup of critical data. To truly be safe it needs to be off and unplugged. A connected usb drive or network file share is not off line enough the crypto malware is getting nasty. Also do not try to get the files back unless you want to pay for them. They are using bank level 128 bit+ asymmetric encryption unless it is poorly implemented or you get extremly lucky the data is gone.
Eric


Re: I've been hacked

Jean-Paul
 

Bonjour à tous

Have been using Avast free AV found some years, very unobtrusive and spares resources. Highly recommended.

W10 defender is automatically dialed off whether W10 detected installation of alternative AV SW.

Jean-Paul


Re: I've been hacked

ebayatessnh
 

Hi Dennis,

This has happened to me twice. Maybe I was lucky, but both times it was just a big annoyance. One hole that I plugged was to switch to the SSL/TLS port for IMAP (993) and SMTP (465).

In the past, most clients defaulted to the insecure ports that send the password in clear text.

Similarly, if you use a Webmail interface, make sure to always use the https:// address to access it. Most servers will automatically switch from http:// to https://, but some still allow http:// which send unencrypted usernames and passwords.

Just my $.02.

Dave


Re: I've been hacked

Chuck Harris
 

As one of the recipients, the email had a subject from
a recent email thread I sent to Dennis, and his From address.

The payload was grafted onto my original message to Dennis.


Dennis normally comes through as:
Received: from [216.251.100.15] ([216.251.100.15:3699] helo=ARMADILLO.netos.com)
by mx.rcn.com (envelope-from <dennis@.....com>)
(ecelerity 3.6.25.56547 r(Core:3.6.25.0)) with ESMTP
id 18/D0-63572-BF1286E5; Tue, 10 Mar 2020 19:25:48 -0400
Received: from Dennis (unverified [73.42.175.173]) by ARMADILLO.netos.com
(Vircom SMTPRS 4.7.840.26) with ESMTP id <B0117095888@...>
(prot=TLS1-S cifer=RC4-128 hash=MD5-128 exch=RSA-2048 verify=NOT) for
<cfharris@.....com>;


The spammer came through as:
Received: from [64.98.42.41] ([64.98.42.41:33444] helo=smtprelay.b.hostedemail.com)
by mx.rcn.com (envelope-from <dennis@.....com>)
(ecelerity 3.6.25.56547 r(Core:3.6.25.0)) with ESMTPS
(cipher=DHE-RSA-AES256-GCM-SHA384)
id 51/40-07473-F49E76E5; Tue, 10 Mar 2020 15:24:00 -0400
Received: from filter.hostedemail.com (10.5.19.248.rfc1918.com [10.5.19.248])
by smtprelay01.b.hostedemail.com (Postfix) with ESMTP id 5ABE610085D1D
for <cfharris@.....com>; Tue, 10 Mar 2020 19:23:59 +0000 (UTC)

And there is this email address grafted in the spam:
Received: from localhost (unknown [191.177.187.253])
(Authenticated sender: emilee@...)
by omf06.b.hostedemail.com (Postfix) with ESMTPA

I would say that the email spamming program is hosted on dennis's machine,
but it is using an open relay at hostedemail.com to spew the payloads.

-Chuck Harris


Tom Gardner wrote:

Did it actually come from your machine or did the "From:" field merely say it was
from you? It is trivial to forge the "From :" field, and the scammers well know that.

All the malefactor needs to achieve is to find a legitimate email somewhere with
valid from and to addresses. Especially valuable are "club" emails which are sent to
many people in a distribution list, since then the malefactors can use all
combinations of from: and to: when constructing their emails.

Consequently I get many /many/ emails /allegedly/ from my acquaintances with links
that are clearly dangerous.


On 10/03/20 23:49, Dennis Tillman W7PF wrote:
My email addresses have been hacked. Noon today my first friend contacted me
about it. Since then 10 other people have contacted me asking if the
suspicious email that got was really from me. The email from me contains a
link to a document that I supposedly sent to them. Delete the email. Do not
open the link.

Two different anti-virus programs I ran this afternoon found nothing unusual
on my PC so at this point I have no idea how they got my list of contacts.

The emails did not originate from my copy of Outlook since there is nothing
suspicious in my Sent folder.

Any TekScopes members that I have corresponded with directly are likely to
receive this email from me if the hacker was able to copy my entire list of
email addresses.



Re: Ringing on 2235 100 volt supply

alfa beta
 

my 2235 has an intermittent contact when I select the XY mode (for my home-made curve tracer)

Was wondering how difficult is to get access to selector for giving it a shot of deoxit

adri





----- Messaggio originale -----
Da: Raymond Domp Frank <@Raymond>
Rispondi a: <TekScopes@groups.io>
A: <TekScopes@groups.io>
Inviato: 10/03/2020 11:46:25
Oggetto: Re: [TekScopes] Ringing on 2235 100 volt supply
________________________________________________________________________________

Hi John,
Happy that your 2235 is fine again. PSU problems can be nasty with these series but mostly it's flaky contacts, including adjustment pots, as in your case. Good that you found the flaky plate connection, since damage will be done if amp outputs touch e.g. a grounded point.
Thanks for letting us know what was wrong and how things went.

Raymond


Re: 465 stopped working

Newton
 

I can't believe it, the model is the 454 NOT the 465! Not sure if I should start a new thread with the correct model number. Apologies.


Re: 465 stopped working

Newton
 

Yes, I swapped in a new one and it blew too.


Re: tek 222 operator's manual

Vintage Test
 

Hi Michel,

Welcome to the group! Your first port of call for all things Tek is the Tekwiki - you can find all the documents for the 222 here: http://w140.com/tekwiki/wiki/222

When you’re finished, have a good look around the site😊

Cheers,
Mel
--
you can never have enough oscilloscopes, DMMs, valve testers or soldering irons . . .


Re: I've been hacked

Tom Gardner
 

Did it actually come from your machine or did the "From:" field merely say it was from you? It is trivial to forge the "From :" field, and the scammers well know that.

All the malefactor needs to achieve is to find a legitimate email somewhere with valid from and to addresses. Especially valuable are "club" emails which are sent to many people in a distribution list, since then the malefactors can use all combinations of from: and to: when constructing their emails.

Consequently I get many /many/ emails /allegedly/ from my acquaintances with links that are clearly dangerous.

On 10/03/20 23:49, Dennis Tillman W7PF wrote:
My email addresses have been hacked. Noon today my first friend contacted me
about it. Since then 10 other people have contacted me asking if the
suspicious email that got was really from me. The email from me contains a
link to a document that I supposedly sent to them. Delete the email. Do not
open the link.

Two different anti-virus programs I ran this afternoon found nothing unusual
on my PC so at this point I have no idea how they got my list of contacts.

The emails did not originate from my copy of Outlook since there is nothing
suspicious in my Sent folder.

Any TekScopes members that I have corresponded with directly are likely to
receive this email from me if the hacker was able to copy my entire list of
email addresses.


Re: 465 stopped working

 

Can you clarify the model and the serial for this scope? The 465 does not have a F1437 that I can find. Do you have a A or B model?

On 3/10/2020 10:16 AM, harris.newton@... wrote:
Hi,

I recently acquired a 465 scope which worked beautifully for my amp building projects. I stored it on it's end (if that has any significance) for a few days whilst I built a new shelf for it. I placed it on the shelf turned on, I'm sure I heard a slight noise and the beam disappeared. Investigating I found fuse 1437 (2A) had blown.
What are the first things to check and how?

I am not used to working on oscilloscopes but have the schematic which I can read so any pointers to get this lovely machine back to life would be appreciated.

Newton