Date   

Low Vertical Trace On 2465B

Singerj181@...
 

I'll be posting a photo on here shortly but I have a Tektronix 2465B that has the entire trace for all four channels along with the measurement output shifted down an entire division. I have read that this could be a u400 problem. Could this be the case? I would love to have some input before I spend the money to get a replacement u400 Hybrid channel switch. Personally this problem rather baffles me so more input would be great.


Re: TEK 5054 CPU Fan

 

David- It's a Celeron / Pentium Socket 478.
The TDS5054 scopes were socket 370, not socket 478. The B scopes were socket 478.


Re: Tektronix 466 Probe Recommendation.

wkibler
 

This is perfect! Thank you.


Re: TEK 5054 CPU Fan

Harold Foster
 

My best guess is a 60mm fan...

Hal


Re: TEK 5054 CPU Fan

Harold Foster
 

David-

It's a Celeron / Pentium Socket 478. Seems like the heatsink had a different mounting arrangement, but I'm not completely sure. I just popped it off long enough to change the processor and I don't remember the details.

If you want to upgrade the memory, this is what I got:

https://www.ebay.com/itm/2GB-2x1GB-PC2700-DDR333-333Mhz-184pin-Desktop-Memory-NON-ECC-Low-Density/221428970247?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

Four 1GB sticks installed and it "just worked".

I just upgraded my TDS5054B-NV-AV to the aforementioned 4GB, a Pentium 4 2.8GHz and a Sandisk 240GB SSD - no issues, and it makes for a noticeable change. On thing, though: do NOT connect a lan cable and update any drivers - many are modified versions and are required for everything to work correctly.

Hal


type 564 oscilloscope manual reprinted 1977, condition VG, $6 shipped

John Griessen
 

It's hardly worn. No marks. The comb binding has handwritten 564 in black marker neatly, otherwise no official markings on comb. Tabs have some bending, but clean. top of cover has edge wear, bending for 1/16".


Re: TEK 5054 CPU Fan

David Kuhn
 

Vibration is that bad, it just started re-booting, or re-starting, at
random. I will unhook that fan for now to see if I can get through imaging
the new 128gb SSD.

On Sat, Apr 25, 2020 at 10:35 AM David Kuhn via groups.io <Daveyk021=
gmail.com@groups.io> wrote:

I was inside my 5054 and my figure hit the CPU fan while running and a
blade broke off. The scope vibrates horribly now. I don't really know CPU
types. What kind of FAN do I need to replace it? Maybe the whole heatsink
and fan? What type of socket heatsink do I look for?

Thanks kindly




TEK 5054 CPU Fan

David Kuhn
 

I was inside my 5054 and my figure hit the CPU fan while running and a
blade broke off. The scope vibrates horribly now. I don't really know CPU
types. What kind of FAN do I need to replace it? Maybe the whole heatsink
and fan? What type of socket heatsink do I look for?

Thanks kindly


Re: 465 dot only, no sweep

Bill
 

On Saturday, April 25, 2020, 08:37:35 AM CDT, <james_55@...> wrote:

Reinstalling the 'reformed' cap has cleared the arcing, but it seems clear I should replace that cap, if not all.

Current situation is all LV rails present and correct.
Lights present on channels and Trig etc.
Scale Illumination working.
NO dot nor trace, even with Beamfinder...

Had a good look on all visible boards through a magnifying glass and resoldered a couple of joints, just in case.


Re: 465 dot only, no sweep

james_55@...
 

Reinstalling the 'reformed' cap has cleared the arcing, but it seems clear I should replace that cap, if not all.

Current situation is all LV rails present and correct.
Lights present on channels and Trig etc.
Scale Illumination working.
NO dot nor trace, even with Beamfinder...

Had a good look on all visible boards through a magnifying glass and resoldered a couple of joints, just in case.


Re: 465 dot only, no sweep

james_55@...
 

On Sat, Apr 25, 2020 at 11:18 AM, Tom Gardner wrote:


What's the advantage to bothering? Reforming is normally merely a temporary
"solution".
True, but I am trying to identify the problem today... Which is a Saturday. Not a day which I can buy new parts.
Even it the old cap lasts only a week, it should give enough time to advance in this repair.


Re: 465 dot only, no sweep

Tom Gardner
 

On 25/04/20 10:33, james_55@... wrote:

what I have done is pulled the +5v filter cap (as looking through my posts that is what origianlly stopped the arcing) and after 20 minutes or so, 'so far' the arcing has completely disappeared.

Shall have a good look at this cap and perhaps try reform it for a longer period.

It does seem that the problem is here.
What's the advantage to bothering? Reforming is normally merely a temporary "solution".

I'd just replace the cap, remembering that a three lead cap is sometimes used to bridge two PCB traces. I'd also replace other caps likely to have the same problem.

Optionally use one of the small PCBs that adapt modern two-pin caps to fit into the older three-pin layouts.


Re: 465 dot only, no sweep

james_55@...
 

On Sat, Apr 25, 2020 at 03:26 AM, Bill wrote:


I would obtain a good magnifying glass and go over the PCBs with a fine
toothed comb.   I do that before I start troubleshooting any circuits. 
Cracked resistors, broken traces, etc. can cause numerous problems.  Hard to
see with the naked eye.
Bill 

Hi Bill,

what I have done is pulled the +5v filter cap (as looking through my posts that is what origianlly stopped the arcing) and after 20 minutes or so, 'so far' the arcing has completely disappeared.

Shall have a good look at this cap and perhaps try reform it for a longer period.

It does seem that the problem is here.


James


Re: 465 dot only, no sweep

james_55@...
 

On Sat, Apr 25, 2020 at 10:03 AM, BobH wrote:


Is the "Horizontal Display" in "A Lock Knobs" and the "Trigger Mode" in
"Auto"?
Hi,

yes they are.


James


Re: Need Plug In Attenuators for Tek 465 Scope

Colin Herbert
 

There is a common problem with these attenuators, in that the joints inside the attenuator sometimes fail. They can sometimes be fixed by the use of a small-tipped soldering iron to quickly re-flow the soldered joints. The plastic tops need to be popped off first, of course. This fix doesn't always work and I'm sorry but I can't remember where I read about it. If the attenuator is truly dead, you have nothing to lose in giving it a try, do you?
Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Timothy Freeze
Sent: 24 April 2020 19:31
To: TekScopes@groups.io
Subject: Re: [TekScopes] Need Plug In Attenuators for Tek 465 Scope

Thanks to all for the help. It looks like I'll be able to get the parts. It's so nice to be able to rescue a vintage instrument.

Thanks again,
Tim


Re: 465 dot only, no sweep

BobH
 

Is the "Horizontal Display" in "A Lock Knobs" and the "Trigger Mode" in "Auto"?

BobH

On 4/24/20 1:27 PM, james_55@... wrote:
One other thing to mention, is that as the screen and neons buzz and flash, the 'Trig' light flickers in unison


Re: Electrolytic Capacitor Removal NO Desoldering Required

Jim Ford
 

Me, too, Tom. One of my friends continually spams me with videos. I watch next to none of them. Who has time? Or wants to run his phone battery down streaming tiny videos on it?

I used to watch the Rick Beato everything music videos on YouTube at lunchtime at work, but then I found out one facility we had had terrible network speed, and it turned out to have the most YouTube watchers! So I only watch on my own time at home (of course work is at home now due to Covid-19).

I agree about the density of information. Most of what I want to know can be conveyed best in text. Maybe still photos or charts. Very rarely in video. Those f*ing news channels that force those videos down my throat are the pits! Even if you scroll down, the little window pops up so you have to click the X to get rid of it! I gotta figure out which ones those are to avoid them like the plague (or Covid-19 to bring us into 2020).

Jim Ford

------ Original Message ------
From: "Tom Gardner" <tggzzz@...>
To: TekScopes@groups.io
Sent: 4/25/2020 1:18:29 AM
Subject: Re: [TekScopes] Electrolytic Capacitor Removal NO Desoldering Required

On 25/04/20 02:41, victor.silva via groups.io wrote:
On Fri, Apr 24, 2020 at 05:13 PM, Richard Knoppow wrote:
The You Tube folks that bother me are the hand wavers.
Constantly pointing and waving in meaningless ways. See a lot of
cooking instructions as well as electronics. Also, lots and lots
of back photography. Oh well, they are doing it and not me.
The guy that irritates me is MJLorton. He'll take something that should take 2 minutes to explain and drag it out for a half hour.
I almost always ignore videos.

There are three fundamental problems when video blogs are compared with written blogs:

1. talking head videos convey at most 60 words per minute; I can read several
thousand words per minute
2. I can speedread even faster, to find the parts that might be of interest to
me. I cannot speedwatch videos with any confidence I will find the fragment
that is useful to me
3. they can't be searched, which restricts the ability of people to find the
interesting video

Given that, they their value per minute of my remaining life is too low for me.

Less fundamental problems are that:

1. most video material does not require pictures, let alone moving pictures
2. most videos would be better expressed in words, without hums and hahs etc
3. videos are too easy to create, so everybody and their dog does it. (Too
often the dog is replaced by a cat)

I will tend to look at videos where:

* there is a textual table of contents with index times
* there is a statement of how I will have benefitted if I invest my time
* moving pictures are beneficial
* they are short, because they have been heavily edited

My favourite example of those are the Pace Basic Soldering Lessons 1 - 9
https://www.youtube.com/playlist?list=PL926EC0F1F93C1837




Re: Electrolytic Capacitor Removal NO Desoldering Required

Tom Gardner
 

On 25/04/20 02:41, victor.silva via groups.io wrote:
On Fri, Apr 24, 2020 at 05:13 PM, Richard Knoppow wrote:
   The You Tube folks that bother me are the hand wavers.
Constantly pointing and waving in meaningless ways. See a lot of
cooking instructions as well as electronics. Also, lots and lots
of back photography. Oh well, they are doing it and not me.
The guy that irritates me is MJLorton. He'll take something that should take 2 minutes to explain and drag it out for a half hour.
I almost always ignore videos.

There are three fundamental problems when video blogs are compared with written blogs:

1. talking head videos convey at most 60 words per minute; I can read several
thousand words per minute
2. I can speedread even faster, to find the parts that might be of interest to
me. I cannot speedwatch videos with any confidence I will find the fragment
that is useful to me
3. they can't be searched, which restricts the ability of people to find the
interesting video

Given that, they their value per minute of my remaining life is too low for me.

Less fundamental problems are that:

1. most video material does not require pictures, let alone moving pictures
2. most videos would be better expressed in words, without hums and hahs etc
3. videos are too easy to create, so everybody and their dog does it. (Too
often the dog is replaced by a cat)

I will tend to look at videos where:

* there is a textual table of contents with index times
* there is a statement of how I will have benefitted if I invest my time
* moving pictures are beneficial
* they are short, because they have been heavily edited

My favourite example of those are the Pace Basic Soldering Lessons 1 - 9
https://www.youtube.com/playlist?list=PL926EC0F1F93C1837


Re: The Spirit of Tek 30 min Video from OPB

 

had to use this link:
Oregon Experience | The Spirit of Tek | Season 4 | Episode 405

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Oregon Experience | The Spirit of Tek | Season 4 | Episode 405

Learn how Tektronix was established as Oregon's first high-tech industry leader.
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On Saturday, April 25, 2020, 02:09:01 AM EDT, Dennis Tillman W7PF <@Dennis_Tillman_W7pF> wrote:

I just finished watching "The Spirit of Tek", a 30 minute program produced
by Oregon Public Broadcasting (OPB). You can see it at
https://www.opb.org/television/programs/oregonexperience/segment/the-spirit-
of-tek-/

It was nice to see the faces and hear the voices of some of the Tek
employees I have been lucky to meet over the years.

Dennis Tillman W7pF


The Spirit of Tek 30 min Video from OPB

 

I just finished watching "The Spirit of Tek", a 30 minute program produced
by Oregon Public Broadcasting (OPB). You can see it at
https://www.opb.org/television/programs/oregonexperience/segment/the-spirit-
of-tek-/

It was nice to see the faces and hear the voices of some of the Tek
employees I have been lucky to meet over the years.

Dennis Tillman W7pF