Date   

Focus on 475 scope

agaguk_99@...
 
Edited

Hi everyone, i have 2. scope 475. I have recaped both and now full working. But the focus on the second one isn't sharp like the first one. I checked high voltage, 2.72kv for the first and 2.6k for the second. Focus and asting are working but i cant adjust the line more than that. Someone know what could be the problem ?

Thank you :)

Look picture here
https://1drv.ms/f/s!AnKLPDy3pII_gkwm-YPX7azSL7Y2


Re: TM500 / 5000 Extenders

Mark Wendt
 

On 01/24/2018 01:18 AM, dnmeeks wrote:
I have no idea but I suspect they aren't compatible. If it helps, I uploaded a drawing showing the pinouts for the TM500/5000. The file is Tek500_5000_Pinouts.png.
There are a couple of signals that use multiple pins. Do you know if the connectors are the same (56 pins)? And there are keys that should prevent plugging a module into a non-compatible socket. On the TM500/5000, they are keyed between pins 6 and 7 (from the bottom).
Dan
Dan,

Is that image in an album?  There's no way to search for individual images on groups.io yet.  Can we get the album name or the image link?

Thanks,
Mark


Re: Serial number location for 7603

Artekmedia <manuals@...>
 

Ian

Our version is for sale at www.ArtekManuals.com. Full size A3, 600 dpi schematics, text searchable, electronic table of contents for faster navigation, gray scale scanning of the photo pages etc. very modestly priced :-)

I'll Send you a private email with more detail

-DC




I'll send you a private email with more information.

On 1/24/2018 2:40 AM, tinkera123 wrote:
Wow, thank you for the interest in my problem. Dave Casey, Dave @Artek Manuals, Dave Wise, DaveD ..... so many Daves .... 😀

To answer a few of your questions ....

I live in Melbourne, Australia ....

The Sticker on my scope is in the correct position, looks like the Tek sticker in photos above, has the number 106586 written on it .... no “B” ..... no “H”.

Also, I found a Sticker with Guernsey Islands on it, amongst the multitude of coloured stickers ...... didn’t for a minute think that it may have been manufactured there. That one I will now leave intact.

It has the Fan option.

So.... it would seem that I have a Guernsey Island manufactured 7603 number 106586. That’s a great start. Thanks to all.

UK Manual??? I am away from Home at the moment (picking up another 7603), so I will start Googling for a UK manual when I get Home.
Does anyone have one, or suggest a web site??
Dave @ Artek .... is your later version manual for sale or a freebee web site??

Thanks,
Ian



--
Dave
Manuals@ArtekManuals.com
www.ArtekManuals.com


Re: Tek 475 no horizontal

Roger Evans
 

It looks like something has caused XY mode to be activated. If you really wanted XY mode it looks like you should depress only the Ch2 button on the vertical mode selector but having both Ch1 and Ch2 depressed probably produces the mixed movement on Ch1.

If you haven't selected XY on the Time/Div switch then check for 5V on pin 18 of U600, this indicates that something else (faulty cam switch segment?) has caused XY mode to be activated. XY mode activates the lockout function on the sweep controller. The 1MHz square wave you see is probably the Ch1-Ch2 chop frequency.

Regards,

Roger


Tektronix auction TODAY JAN 24th- from FB post by Lloyd Ewing

Peter Mulvey
 

Post from Lloyd Ewing in FB copied below as may be of interest to those in Texas:

Does anyone out there live in the Austin Texas area? I just found this group, and I would like to know if there are other local people who collect vintage test equipment. Or could you suggest other groups where I might be able to find local people? (I know about the local ham radio groups.)

There is currently an auction at the University of Texas in Austin which has 14 vintage scopes for sale (sold as a lot). The auction ends today Wednesday Jan 24 at 1 PM, and I can't bid on this item because I do not have the storage space.

I apologize for not posting this info earlier. I hope that I can find other local collectors in case something like this happens again. (My local phone in reverse is 3987638.)

https://swicoauctions.com/browse#/category/586/item/208789
https://swicoauctions.com/browse#/category/586


Re: Serial number location for 7603

tinkera123
 

Wow, thank you for the interest in my problem. Dave Casey, Dave @Artek Manuals, Dave Wise, DaveD ..... so many Daves .... 😀

To answer a few of your questions ....

I live in Melbourne, Australia ....

The Sticker on my scope is in the correct position, looks like the Tek sticker in photos above, has the number 106586 written on it .... no “B” ..... no “H”.

Also, I found a Sticker with Guernsey Islands on it, amongst the multitude of coloured stickers ...... didn’t for a minute think that it may have been manufactured there. That one I will now leave intact.

It has the Fan option.

So.... it would seem that I have a Guernsey Island manufactured 7603 number 106586. That’s a great start. Thanks to all.

UK Manual??? I am away from Home at the moment (picking up another 7603), so I will start Googling for a UK manual when I get Home.
Does anyone have one, or suggest a web site??
Dave @ Artek .... is your later version manual for sale or a freebee web site??

Thanks,
Ian


Re: TM500 / 5000 Extenders

dnmeeks
 

I have no idea but I suspect they aren't compatible. If it helps, I uploaded a drawing showing the pinouts for the TM500/5000. The file is Tek500_5000_Pinouts.png.
There are a couple of signals that use multiple pins. Do you know if the connectors are the same (56 pins)? And there are keys that should prevent plugging a module into a non-compatible socket. On the TM500/5000, they are keyed between pins 6 and 7 (from the bottom).
Dan


Re: TM500 / 5000 Extenders

Fred. Olsen
 

Dan, these look great but will you be making more? I'd be interested in two. If you're so inclined the "complete kit" format would be my first choice, to save me a few bucks and you some flux smoke. Fully built would be my second choice.

Thanks,
Fred


Tek 475 no horizontal

Warren Brewster
 

Hi,

I have a Tek 475, that I recently repaired ( faulty cap in voltage divider for HV circuit).
I tested the scope and checked as per service manual - worked perfectly.
Turned off and unplugged power lead

When putting the cover back on the edge of the cover caught a single wire connecting the DM44 to the timing board - breaking the wire off the timing board.
I reversed to cover removal and then unplugged other end of the wire.

Re tested scope and all functions work perfectly - so powered down and left overnight.
Next day decided to re-solder wire back onto timing board.
- Removed A8 Trigger / Z-axis board and A7 timing board as per service manual.
- Re-soldered wire ( easy to see where as came from) to trigger board
- Refitted A7 and A8 boards ( I also took pics of all cables just in case) - all cables returned to correct positions.
- Powered up - no horizontal trace :-((

If I set input to display CH1 and CH2 - 2 dots appear.
- Vertical adjust on CH2 moves CH2 up/down
- Vertical adjust on CH1 moves CH1 diagonally right/up.
- Horizontal adjust no effect.

Tested with spare scope - getting square wave from J399, TP526 shows 250mv square wave @~1Mhz.
U520 outputs also show square wave
- Waveform at Q566 is small square wave ( approx 8Mv p-p)

Suggestions of where fault may be - or where to test
Horizontal amp and sweep gen - no saw tooth waveform - probably due to trigger fault???


Regards,

Warren


Re: TM500 / 5000 Extenders

Rick
 

Dan,

Do the electronic components on your board make it incompatible to extend the 5000 series mainframe scopes? I see that pads 3 & 4 are ganged together. Does that also make it incompatible?

I've got a 5CT1N curve tracer that I need to work on with my 5440 and would love to use your extender as long as it does melt it. Pin 1A has 200v on the mainframe.

Thanks, Rick


Re: OT: But still techie... what is it? There are

glkinst <glkinst@...>
 

Dave,Interesting device. Thanks for sharing it with the group.George

On Monday, January 22, 2018 10:24 PM, Dave Seiter <d.seiter@att.net> wrote:


OK, that makes a lot of sense.  I was confused by the fact that there were no thru ports for electrical, and that the container seemed ill-suited for whatever the sensor assembly was detecting. The container does have an o-ring.  
Thanks All for the info; I wasn't getting much searching, maybe because I was using duckduckgo.
-Dave

      From: George Kerber <gk5220@gmail.com>
To: TekScopes@groups.io
Sent: Monday, January 22, 2018 9:58 PM
Subject: Re: [TekScopes] OT: But still techie... what is it? There are
 
Google search found that it is a " Focused Mesh Multiplier (MM-1). For
pulse counting or current measurement of electrons, ions, UV or x-ray
photons, and energetic neutral atoms or molecules."  The can is just a
shipping container for protection of the delicate assembly and may be
filled inert gas or vacuum for shipping. Is there an o-ring or gasket on
the can? - george
see http://pubs.acs.org/doi/abs/10.1021/ac60301a735

On Mon, Jan 22, 2018 at 5:35 PM, John Griessen <john@ecosensory.com> wrote:

On 01/22/2018 04:54 PM, Richard Knoppow wrote:

How does one deal with this?
https://groups.io/g/TekScopes/album?id=16071   What is it? Updated 12:09
pm




Re: 475 Sweep question

donald collie
 

I found a dead transistor in the Z Amp, which prompted me to check all the
Z Amp transistors, but the rest are OK. My 453A does this on the fastest
sweep setting, but only half a major division, and my 7834 not at all. The
Z compensation adjustment capacitor has no effect, so I`ll look in the
sweep section for the adjustment.
Thankyou........................................................................................................................................................................................................................Don
C.

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On Wed, Jan 24, 2018 at 2:44 AM, Chuck Harris <cfharris@erols.com> wrote:

That is due to the amount of time the z-axis circuitry
takes to get the beam lit up and going. There is an
adjustment to minimize the effect, but it isn't perfect.

-Chuck Harris

donald collie wrote:
When I look at a 100Mhz signal, instead of starting at the left of the
CRT
graticule, the trace starts at the 2nd major division - 2 divisions to
the
right of the Left Hand Side. Is this normal?
This happens on both A, and B sweeps, at maximum sweep speed only. Your
comment will be appreciated.
Regards.....................................................
............................Don
Collie jnr.



Re: Hopefully the last 485 recap question

Ed Breya
 

Those are Tek-made, hermetically sealed plastic film caps, and should never fail in normal use. Let them be. Ed


Re: Hopefully the last 485 recap question

Chuck Harris
 

That is not an aluminum electrolytic capacitor. That is
a very high quality capacitor, leave it alone.

Really, if you are replacing parts like that, you are doing
your scope great harm.

-Chuck Harris

lop pol via Groups.Io wrote:

Well that was a giant fail.

https://ibb.co/fbgOKG


Re: Hopefully the last 485 recap question

Brendan
 

Well that was a giant fail.

https://ibb.co/fbgOKG


Re: Hopefully the last 485 recap question

Brendan
 


Re: Hopefully the last 485 recap question

Chuck Harris
 

The body of any aluminum electrolytic capacitor that
I am aware of is made from aluminum. It won't solder
without special efforts.

Could you be more specific?

-Chuck Harris

lop pol via Groups.Io wrote:

There are several caps on the timing board and on the inverter board that seem to be grounded by soldering to the body of the capacitor. Is this necessary to replicate?


Re: Serial number location for 7603

Dave Wise
 

Thank you, Philip, for the memory jog. I've seen that style of tag, many times, but forgot due to years of non-refresh.

Dave Wise
________________________________________
From: TekScopes@groups.io <TekScopes@groups.io> on behalf of Phillip Potter <p.potter@sbcglobal.net>
Sent: Monday, January 22, 2018 7:14 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Serial number location for 7603

Here you go, and thanks for the prompt, Dave Casey!

https://groups.io/g/TekScopes/album?id=17107&;p=Name,,,20,1,0,0


On 1/22/2018 5:50 PM, Dave Casey wrote:
On the 7603, 7613, and probably others, the serial number is a sticker just
like the ones found on the plugins. It is not stamped, nor is it on one of
those inserts like other equipment (7854, 2336, 492, etc). How many of my
7603's would you like pictures of as proof?

Dave Casey


Re: Serial number location for 7603

Dave Wise
 

I'll take your word for it until I have time to independently confirm.

Sorry to the rest of you for reducing the signal to noise ratio. I was trying to help, but sometimes that goes wrong.

Dave Wise
________________________________________
From: TekScopes@groups.io <TekScopes@groups.io> on behalf of Dave Casey <polara413@gmail.com>
Sent: Monday, January 22, 2018 5:50 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Serial number location for 7603

On the 7603, 7613, and probably others, the serial number is a sticker just
like the ones found on the plugins. It is not stamped, nor is it on one of
those inserts like other equipment (7854, 2336, 492, etc). How many of my
7603's would you like pictures of as proof?

Dave Casey

On Mon, Jan 22, 2018 at 7:27 PM, Dave Wise <david_wise@phoenix.com> wrote:

The sticker is likely a property ID tag having nothing to do with S/N.
Serial numbers were stamped in metal, on the front panel itself for early
products, later on a slug that was press-fitted into the panel.

Dave Wise


Hopefully the last 485 recap question

Brendan
 

There are several caps on the timing board and on the inverter board that seem to be grounded by soldering to the body of the capacitor. Is this necessary to replicate?

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