Author Topic: Tektronix 2465B oscilloscope teardown  (Read 439503 times)

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Offline AMR Labs

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Re: Tektronix 2465B oscilloscope teardown
« Reply #1125 on: August 10, 2018, 12:25:26 pm »
Does anybody know why some 24xx scopes don't seem to have the blue filter installed over the screen? Was the filter an option, or is it removable? If I get a scope without the blue filter, is it easy to get one and reinstall it? Personally I think the filter helps quite a bit, and don't understand why anyone would remove it to use a scope without it being present.

Still looking for my future 24xx...

Thanks.
 

Online BravoV

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Re: Tektronix 2465B oscilloscope teardown
« Reply #1126 on: August 10, 2018, 04:05:38 pm »
Its removeable easily and installation too, not a big deal, just read the service manual, there is a graphical illustration.

I guess on those that removed, prolly they were badly scratched or cracked as its just sort of acrylic blue thingy.

Offline james_s

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Re: Tektronix 2465B oscilloscope teardown
« Reply #1127 on: August 10, 2018, 04:14:56 pm »
Perhaps it worked better with a scope camera to not have the filter? Seems like the filter is easily removable on my 465 too, looks better with it on though.
 

Online BravoV

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Re: Tektronix 2465B oscilloscope teardown
« Reply #1128 on: August 13, 2018, 08:12:28 am »
Perhaps it worked better with a scope camera to not have the filter? Seems like the filter is easily removable on my 465 too, looks better with it on though.

To my eyes, on camera its better with filter on, shot this while ago.


Offline AMR Labs

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Re: Tektronix 2465B oscilloscope teardown
« Reply #1129 on: August 19, 2018, 01:38:58 pm »
Guys I have still no idea, even with the possibility of the filter not allowing good pictures etc, why so many of these scopes out there seem to be missing the blue filter. Or is it perhaps that the scope picture taking crowd is/was larger than one would think? I have to agree the screen looks so much better with the filter attached, so why would anyone remove it (ok besides scratched/broken which i would think is just a minority of the cases (?). Anyhow I am glad it would be an easy fix, maybe someone out there would have one to sell. But first is first, getting a scope to go with the filter, or ideally not needing to look for one to begin with.

Also wanted to ask, would a 2465A low SN under 50K (~10000) have SMD boards, or would the components be through hole? In this same model would there also be the possibility of having the dreaded cap rot on the A5 board, and a dying NVRam module? I'm asking because I read that some of these scopes do not have these problems.

Is there a reference table out there somewhere that would help to have a better idea of the innards of the scope in relation to its model/version/serial number?

Thanks.
 

Offline james_s

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Re: Tektronix 2465B oscilloscope teardown
« Reply #1130 on: August 19, 2018, 05:36:44 pm »
Maybe the filter was an optional accessory that not everyone chose to purchase? You can get sheets of colored gel at camera and theatrical shops in a wide range of shades, there may be one that's a good match for the blue filter if anyone is looking to add one.
 

Offline Satbeginner

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Re: Tektronix 2465B oscilloscope teardown
« Reply #1131 on: August 19, 2018, 05:44:51 pm »
Many of the filters just got lost, like the front covers.
Especially the front covers, they all seem to end up as pencil cases in some deskdrawer.
The filters were designed for an easy removal in the case of a film scope-camera.


You need a scope to repair a scope, and you need many multimeters to repair another multimeter!
*Tek 2467B, Tek 2465B, Tek 2465B, Tek 485, Tek 475A,  Keithley 175A, Keithley 2000, HP 3468B, HP 3457A, HP 34401A, PM 6671, PM 5716, Fluke 45, Fluke 75, Fluke 77, Fluke 79, AFX 9660BL, KPS 605D, etc. *
 

Offline tkamiya

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Re: Tektronix 2465B oscilloscope teardown
« Reply #1132 on: August 19, 2018, 05:52:42 pm »
I have a 2465BCT with Dallas chip that is toast.  All cal data is GONE.  Would anyone be so kind to point me to a right direction?  I really don't want to cal this scope as I don't need that kind of precision.
 

Offline AMR Labs

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Re: Tektronix 2465B oscilloscope teardown
« Reply #1133 on: August 19, 2018, 06:07:25 pm »
Especially the front covers, they all seem to end up as pencil cases in some deskdrawer.

Maybe we need to start using different search terms on ebay, like "Blue Pencil Tray" or "holder". Some time ago, just to see what came up, I tried looking for a 2465 front cover, but not one positive result came back.
 

Offline Satbeginner

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Re: Tektronix 2465B oscilloscope teardown
« Reply #1134 on: August 19, 2018, 06:15:20 pm »
I have a 2465B with option 06 (I believe that is the CT).
When I revived my unit -A5 capacitor leaking- I also replaced the Dallas and calibrated my scope.
I can send you my Dallas contents, but you need to replace and program the Dallas.
I put my Dallas in a socket, so it was easy to backup the data after calibration using a programmer.

All pins can be cleared using a sucker, only pin 14 needs to be removed while putting a soldering iron on it, because of the ground plane it needs a bit more heat.
To remove the Dallas, I remove the tin around a pin, then I wiggle each pin using a small pair of pliers a bit so I see the pin is loose, before pulling, this to protect the vias in he PCB.

Obviously there is no guarantee that your scope will be close to it's normal function when you use my caldata.

You need a scope to repair a scope, and you need many multimeters to repair another multimeter!
*Tek 2467B, Tek 2465B, Tek 2465B, Tek 485, Tek 475A,  Keithley 175A, Keithley 2000, HP 3468B, HP 3457A, HP 34401A, PM 6671, PM 5716, Fluke 45, Fluke 75, Fluke 77, Fluke 79, AFX 9660BL, KPS 605D, etc. *
 

Offline David Hess

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Re: Tektronix 2465B oscilloscope teardown
« Reply #1135 on: August 19, 2018, 07:35:03 pm »
Maybe we need to start using different search terms on ebay, like "Blue Pencil Tray" or "holder". Some time ago, just to see what came up, I tried looking for a 2465 front cover, but not one positive result came back.

The sellers often do not know which instrument the cover goes to or do not list them all.

When I was cover shopping, I had the dimensions which sellers often list and just did a search for Tektronix and oscilloscope covers.
 

Offline tkamiya

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Re: Tektronix 2465B oscilloscope teardown
« Reply #1136 on: August 19, 2018, 08:26:40 pm »
I have a 2465B with option 06 (I believe that is the CT).
Obviously there is no guarantee that your scope will be close to it's normal function when you use my caldata.


If you don't mind, I'd love to have what you have.  tkamiya9(at)yahoo.com please!
 

Offline Satbeginner

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Re: Tektronix 2465B oscilloscope teardown
« Reply #1137 on: August 19, 2018, 08:45:35 pm »
Message send
You need a scope to repair a scope, and you need many multimeters to repair another multimeter!
*Tek 2467B, Tek 2465B, Tek 2465B, Tek 485, Tek 475A,  Keithley 175A, Keithley 2000, HP 3468B, HP 3457A, HP 34401A, PM 6671, PM 5716, Fluke 45, Fluke 75, Fluke 77, Fluke 79, AFX 9660BL, KPS 605D, etc. *
 

Offline tkamiya

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Re: Tektronix 2465B oscilloscope teardown
« Reply #1138 on: August 19, 2018, 08:50:38 pm »
Received.  Thank you!
 

Offline Satbeginner

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Re: Tektronix 2465B oscilloscope teardown
« Reply #1139 on: August 19, 2018, 08:57:54 pm »
Perhaps it worked better with a scope camera to not have the filter? Seems like the filter is easily removable on my 465 too, looks better with it on though.

To my eyes, on camera its better with filter on, shot this while ago.



The camera used in that case is a camera that was directly positioned over the CRT, where the little groove is for.
Polaroid and Kodak made the films I believe.
Often used in old school labs where stuff was mostly Single Shot, like short laser pulses etc.

Like these:

https://www.google.de/search?biw=1745&bih=892&tbm=isch&sa=1&ei=K9l5W5ONO4_uaYKbrsgF&q=tektronix+crt+camera&oq=tektronix+crt+camera&gs_l=img.3...0.0.0.7878.0.0.0.0.0.0.0.0..0.0....0...1c..64.img..0.0.0....0.FDak53Igd1A

Un saludo,

satbeginner (Leo)

You need a scope to repair a scope, and you need many multimeters to repair another multimeter!
*Tek 2467B, Tek 2465B, Tek 2465B, Tek 485, Tek 475A,  Keithley 175A, Keithley 2000, HP 3468B, HP 3457A, HP 34401A, PM 6671, PM 5716, Fluke 45, Fluke 75, Fluke 77, Fluke 79, AFX 9660BL, KPS 605D, etc. *
 

Offline tkamiya

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Re: Tektronix 2465B oscilloscope teardown
« Reply #1140 on: August 19, 2018, 09:30:09 pm »
Now I need to buy a programmer.  Purchases never end.  Shrinking budget never stops.   until it reaches zero.
 

Offline Satbeginner

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Re: Tektronix 2465B oscilloscope teardown
« Reply #1141 on: August 19, 2018, 09:44:14 pm »
I used this one:

You need a scope to repair a scope, and you need many multimeters to repair another multimeter!
*Tek 2467B, Tek 2465B, Tek 2465B, Tek 485, Tek 475A,  Keithley 175A, Keithley 2000, HP 3468B, HP 3457A, HP 34401A, PM 6671, PM 5716, Fluke 45, Fluke 75, Fluke 77, Fluke 79, AFX 9660BL, KPS 605D, etc. *
 

Online BravoV

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Re: Tektronix 2465B oscilloscope teardown
« Reply #1142 on: August 20, 2018, 02:07:21 am »
Perhaps it worked better with a scope camera to not have the filter? Seems like the filter is easily removable on my 465 too, looks better with it on though.

To my eyes, on camera its better with filter on, shot this while ago.



The camera used in that case is a camera that was directly positioned over the CRT, where the little groove is for.
Polaroid and Kodak made the films I believe.
Often used in old school labs where stuff was mostly Single Shot, like short laser pulses etc.

Like these:

https://www.google.de/search?biw=1745&bih=892&tbm=isch&sa=1&ei=K9l5W5ONO4_uaYKbrsgF&q=tektronix+crt+camera&oq=tektronix+crt+camera&gs_l=img.3...0.0.0.7878.0.0.0.0.0.0.0.0..0.0....0...1c..64.img..0.0.0....0.FDak53Igd1A

Un saludo,

satbeginner (Leo)

Leo, that photo was shot using plain cheap dslr.  :P

Here is how the setup looks like :



No hood nor special tool was used, I shared this little trick while ago, read the details -> HERE.
 
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Offline AMR Labs

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Re: Tektronix 2465B oscilloscope teardown
« Reply #1143 on: August 20, 2018, 02:38:24 am »
So getting back to my other question, what do you guys think about an early serial (under 50K)  2465A version scope, possibly showing an error message on screen at power up, but that otherwise seems to properly display traces and cursors, a bit dusty on the outside but no broken shafts or missing knobs buttons, or any other obvious damage, etc, no front cover or probes, but yes it has the blue screen filter. I have not had a chance to see it personally, but this is what i have so far been able to glean into the situation, and I am still haggling with the owner over a compromise price given probable problems. Just like trying to buy a car without even test driving it first, so how much trouble could I possibly get into....? Ha!
« Last Edit: August 20, 2018, 02:41:39 am by AMR Labs »
 

Online med6753

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Re: Tektronix 2465B oscilloscope teardown
« Reply #1144 on: August 20, 2018, 03:28:39 am »
So getting back to my other question, what do you guys think about an early serial (under 50K)  2465A version scope, possibly showing an error message on screen at power up, but that otherwise seems to properly display traces and cursors, a bit dusty on the outside but no broken shafts or missing knobs buttons, or any other obvious damage, etc, no front cover or probes, but yes it has the blue screen filter. I have not had a chance to see it personally, but this is what i have so far been able to glean into the situation, and I am still haggling with the owner over a compromise price given probable problems. Just like trying to buy a car without even test driving it first, so how much trouble could I possibly get into....? Ha!

To answer your prior question from earlier. The A5 board in the 2465A is pin thru hole. At least that's what the service manual shows. Could later S/N's be SMD? Wouldn't surprise me.

What is the error message? Can you get the seller to tell you?
An old gray beard with an attitude.
 

Offline AMR Labs

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Re: Tektronix 2465B oscilloscope teardown
« Reply #1145 on: August 20, 2018, 01:38:52 pm »
I am asking him to send me a picture of the error message, but he really doesn't know much about scopes. I am not sure of the procedure to bring up the error message myself, but I assume telling him to just turn on the scope and then taking a picture of the first screen he will see would be enough to capture the error message? Thanks for the input.
 

Online med6753

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Re: Tektronix 2465B oscilloscope teardown
« Reply #1146 on: August 20, 2018, 03:26:35 pm »
I am asking him to send me a picture of the error message, but he really doesn't know much about scopes. I am not sure of the procedure to bring up the error message myself, but I assume telling him to just turn on the scope and then taking a picture of the first screen he will see would be enough to capture the error message? Thanks for the input.

Yes, when you press power on the scope will boot and then stop at the error message. It will be displayed across the bottom of the screen.

Edit....here's an example:
« Last Edit: August 20, 2018, 03:29:26 pm by med6753 »
An old gray beard with an attitude.
 

Offline AMR Labs

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Re: Tektronix 2465B oscilloscope teardown
« Reply #1147 on: August 20, 2018, 03:54:40 pm »
OK got it, that was very helpful. I was thinking the error message would be displayed more towards the middle of the screen, where I saw something on an earlier picture but it was way too blurry to be readable because of unsteadiness of the camera. Is there any other type of message that would come up at some point in or around the center of the screen? Thanks.
 

Offline AMR Labs

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Re: Tektronix 2465B oscilloscope teardown
« Reply #1148 on: August 20, 2018, 05:11:06 pm »
Another useful bit of information at this point while looking for a 246x scope would be if there is an error code specific to an instrument that has lost its calibration constants? Is there such error message, or is there anything else I would need to look out for to know for sure that the calibration is gone? Thanks.
« Last Edit: August 20, 2018, 06:00:34 pm by AMR Labs »
 

Offline David Hess

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Re: Tektronix 2465B oscilloscope teardown
« Reply #1149 on: August 20, 2018, 08:00:39 pm »
I bought a Canon SX150 just for taking oscilloscope photographs and use it freehand well enough in ambient room lighting but you can also make a camera mount to use the existing bezel mount on these oscilloscopes:

http://glydeck.blogspot.com/2011/03/motorola-mystery.html
https://www.amplifier.cd/Technische_Berichte/Photographie_Oszilloskop/Foto_Halterung.html

There used to be one here but it is gone:

http://www.cembreros.jazztel.es/camerascope/camscope_en.htm
 


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