This one is a plain old 2465. I do have an A version as well, that's working quite well, but the 300MHz one is my favourite. Unfortunately it's not jitter - that control makes no difference (although I only moved it about 5? either way). Looking at the display more critically, it seem to me to be power supply ripple, possibly on the voltages supplying the tube driver and X/Y circuits.....
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Hi ? I just went through the calibration on a 2465A yesterday – for me a 3 Hour job on that one with all of the proper Tektronix Calibration Equipment. CAL 06 always takes some time with all of the extra equipment (Cables, adapters, Tunnel Diode Pulser, 3 attenuators, Sweep Generators, etc.), steps involved. ? ? If it is just a vanilla 2465, not an A or B (you still adjust Readout Jitter on those models too), look at page 5-8 in the Rev. March 1983 and October 1984 Service Manuals, Section 3 procedure. You adjust R618 for minimum Character Jitter. ? After Calibration it is also checked on page 5-18 in that same Service Manual Revisions step dd. ? ? If it is a 2465A/2465B, look at page 5-11/5-12 in the Service Manual for the Jitter Adjustment. You adjust R618 for minimum Character Jitter. ? There is also a specific Readout Jitter Centering and Gain Adjustment in the Calibration Section (CAL 07), on page 5-22 or 5-23. This test makes a row of 8’s across the top Readout and a row of the Bandwidth Limit Characters (BWL), across the Bottom Readout. You adjust R2918 to Center the Readout, and R2931 to adjust the Gain of the Readout. I haven’t ever entered CAL 07 independently of Calibrating an Oscilloscope starting at CAL 01, I don’t know if entering it directly from the menu is advisable – I think the Manual says it’s okay, I haven’t ever done it that way. ? There are different Adjustments if you have the 2445A/2465A Service Manual and board. The Service Manual page is 5-22 and still has R618 for Readout Jitter, R638 for Readout Gain, R639 for Readout Centering and adds R805 for Readout Horizontal Jitter. I have never seen the other board (with the R638, R639 and R805 Potentiometers – maybe that is just for the 2445A), so I haven’t performed this procedure. It also has a CAL 07 procedure on page 5-20 for Readout Jitter using the same Adjustments as the other 2465A and Potentiometers ? ? So, the Readout Jitter adjustment Potentiometers are: ? R618 – Minimum Jitter R2819 – Readout Centering R2931 – Readout Gain (size of Characters) ? If you are going to adjust them, you can do that without going into Calibration. ? Always mark the position of the rotor (usually White plastic), with reference to the base (usually Blue or Black plastic), I use a small fine tipped sharpie for that, take a picture with your phone, and adjust as require. If you make a mistake, go back to where they were marked and try again. A small adjustment may only be required to fix them. ? Good Luck, Ross ? ? ?
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From: [email protected] < [email protected]> On Behalf Of satbeginner Sent: Thursday, December 29, 2022 8:38 AM To: [email protected]Subject: Re: [TekScopes2] 2465 Power Supply ? Hi,
Not at home at the moment, but if I remember correctly, there is a "read-out jitter" adjustment somewhere in the calibration routine.
Will check later, but it is somewhere in the service manual calibration chapter.
Leo
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Hi,
Not at home at the moment, but if I remember correctly, there is a "read-out jitter" adjustment somewhere in the calibration routine.
Will check later, but it is somewhere in the service manual calibration chapter.
Leo
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I've been working on the 2465 power supply again, it is a lovely 'scope but there is one little problem - the display isn't 100% stable, especially the characters - they have a sort of fizz, can't think how else to describe it. It's not a wobble, the characters stay in place but it's like the intensity has a high-frequency modulation.
Voltages are lovely: 10.005 / 87.00 / 42.70 / 15.07 / 5.005 (digital) / 4.997 (analog) / -5.009 / -8.098 / -17.02
I have changed all the electrolytics on the A2 board and C1021, C1022 on the A3 board. Everything looks sweet but the display isn't as good as it could be. I think it'll be a capacitor change again, can anyone suggest where to begin?
Thanks,
Richard
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Re: 7704A power supply fail (big leak of the main caps)
I've considered replacing all wet caps once the PS was out (obviously they're all due), but as I needed to test my work with the large ones, it's all now back together. Maybe I'll stumble on an open evening soon and get that handled.? Radu.?
On Tue, Dec 27, 2022 at 2:57 AM emissionlabs < jac@...> wrote: I would not trust the arced part of the PCB. You can just drill the arced part away.?? If that cuts partially or fully? some PCB trace,?? you can restore that, there will be only a hole underneath.?
This defect makes other capacitors suspicious too.? Those cheap Chinese ESR meters on Ebay, work really well if you want to find bad capacitors without taking them all out.?? I
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Re: 7704A power supply fail (big leak of the main caps)
I would not trust the arced part of the PCB. You can just drill the arced part away.?? If that cuts partially or fully? some PCB trace,?? you can restore that, there will be only a hole underneath.?
This defect makes other capacitors suspicious too.? Those cheap Chinese ESR meters on Ebay, work really well if you want to find bad capacitors without taking them all out.?? I
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Re: 7704A power supply fail (big leak of the main caps)
Rdu -
In my experience, TEK power supplies are one of the things that fail with some frequency.
My strategy is to have a (at least one) spare power supply. It should be relatively easy to find a "sare 7704 supply. Unfortunately, the 7704 supply is different from the 7904 (you other scope if it ever comes home) so you may need two kinds. I made sure my scopes all use the same supply and I have more than one back up.
Cheers!
Bruce
Quoting Radu Bogdan Dicher <vondicher@...>:
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I think I'm done with the repair. See
/g/TekScopes/album?id=282665.
What leaked (mainly?) was C3016, but C3017 was also suspect, so I replaced
both. Though I'd never run this with dissimilar caps even if one may be OK.
There was a huge mess to clean - these large caps have quite a load of goo
to spill!.. - and I used successive applications of pure alcohol and
ammonia with different types of swabs and pads (ammonia being the more
effective treatment). Some of the leaking electrolyte even triggered
arching through the board (documented in the pictures). I removed the
artifacts of that by essentially digging in there with some of my
"soldering/desoldering" tools I have until I reached unaffected PCB
material.
I've sparingly and locally applied a bit of contact cleaner on the caps
traces to make sure my contraption of the "screw top" caps makes perfect
contact in a compromised situation.
Fully back into operation now. I also have some added confidence in how
long this will be trouble-free not only because of the age of the caps
(brand new), the added capacitance (not enough to be a problem), but mostly
the rated max voltage. Also, 105C caps, which never hurts.
Radu.
On Sun, Dec 25, 2022 at 11:03 AM Radu Bogdan Dicher via groups.io
<vondicher@...> wrote:
I've placed an order for some screw terminal caps, but I do have some
United Chemicon KMZs (680uF/450V) at hand that may work. I'd need to
jerry-rig then in there, which doesn't seem too difficult.
But I wonder what I should be looking for with caps in this application as
minimum safe ratings. I assume the SMPS application with its direct line
exposure and such subjects these to some hefty abuse. For instance, my
particular KMZs are rated up to 2.25A ripple at 105C/120Hz.
Any thoughts and recommendations would be appreciated.
On Sat, Dec 24, 2022, 11:05 AM Radu Bogdan Dicher via groups.io
<vondicher@...> wrote:
I think the green/white wire goes to L3236, the 5V lights supply
On Sat, Dec 24, 2022, 8:48 AM Radu Bogdan Dicher via groups.io
<vondicher@...> wrote:
Hi all,
And Happy Holidays to all celebrating!
I've woken up the morning of Christmas Eve to a nice surprise - smoke,
noises, smell, etc. Upon pulling out the power supply, I see that the main
caps (computer grade Sprague caps) have failed and made a big mess inside
the unit. Things have been leaking so bad this morning, I had to take it
apart very quickly, and scrambled to wash off any of the goo and
electrolyte. Luckily, I think this all almost happen in front of my eyes,
so not much of this stuff has stayed very long on the board, but there's
some more serious damage on the board and traces just below the caps.
Some requests for input:
- what have you found best for cleaning this up? I used various
sizes cotton swabs to cosmetic pads and alcohol (not single malt... ;))
- suggestions on caps replacements? I haven't started looking, but I
do have some faves to search (Nebraska Surplus, etc.).
- When scrambling to extract the caps without leaking too much in
too many places I've detached a very short wire (white/green?). I really
hate it when the design includes short sighted decisions like this - where
a wire is too short to open up access by unfolding a board while all other
wires are long enough, WTH? Would anyone know offhand where this attaches?
I know this is a very long shot.
- Does anyone have a spare, "known good," PS and is willing to
depart with it?
Thank you all.
Radu.
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Re: 7704A power supply fail (big leak of the main caps)
I think I'm done with the repair. See? /g/TekScopes/album?id=282665.? What leaked (mainly?) was C3016, but C3017 was also suspect, so I replaced both. Though I'd never run this with dissimilar caps even if one may be OK.? There was a huge mess to clean - these large caps have quite a load of goo to spill!.. - and I used successive applications?of pure alcohol and ammonia with different?types of swabs and pads (ammonia being the more effective treatment). Some of the leaking electrolyte even triggered arching through the board (documented in the pictures). I removed the artifacts of that by essentially digging in there with some of my "soldering/desoldering" tools I have until I reached unaffected PCB material.?
I've sparingly and locally applied a bit of contact cleaner on the caps traces to make sure my contraption of the "screw top" caps makes perfect contact in a compromised situation.?
Fully back into?operation now. I also have some added confidence in how long this will be trouble-free not only because of the age of the caps (brand new), the added capacitance (not enough to be a problem), but mostly the rated max voltage. Also, 105C caps, which never hurts.? Radu.?
On Sun, Dec 25, 2022 at 11:03 AM Radu Bogdan Dicher via <vondicher= [email protected]> wrote: I've placed an order for some screw terminal caps, but I do have some United Chemicon KMZs (680uF/450V) at hand that may work. I'd need to jerry-rig then in there, which doesn't seem too difficult.? But I wonder what I should be looking for with caps in this application as minimum safe ratings. I assume the SMPS application with its direct line exposure and such subjects these to some hefty abuse. For instance, my particular KMZs are rated up to 2.25A ripple at 105C/120Hz.?
Any thoughts and recommendations?would be appreciated. On Sat, Dec 24, 2022, 11:05 AM Radu Bogdan Dicher via <vondicher= [email protected]> wrote: I think the green/white wire goes to L3236, the 5V lights supply
On Sat, Dec 24, 2022, 8:48 AM Radu Bogdan Dicher via <vondicher= [email protected]> wrote: Hi all,
And Happy Holidays to all celebrating!
I've woken up the morning of Christmas Eve to a nice surprise - smoke, noises, smell, etc. Upon pulling out the power supply, I see that the main caps (computer grade Sprague caps) have failed and made a big mess inside the unit. Things have been leaking so bad this morning, I had to take it apart very quickly, and scrambled to wash off any of the goo and electrolyte. Luckily, I think this all almost happen in front of my eyes, so not much of this stuff has stayed very long on the board, but there's some more serious damage on the board and traces just below the caps.?
Some requests for input:
- what have you found best for cleaning this up? I used various sizes cotton swabs to cosmetic pads and alcohol (not single malt... ;))
- suggestions on caps replacements? I haven't started looking, but I do have some faves to search (Nebraska Surplus, etc.).?
- When scrambling to extract the caps without leaking too much in too many places I've detached a very short wire (white/green?). I really hate it when the design includes short sighted decisions like this - where a wire is too short to open up access by unfolding a board while all other wires are long enough, WTH? Would anyone know offhand where this attaches? I know this is a very long shot.?
- Does anyone have a spare, "known good," PS and is willing to depart with it??
Thank you all.
Radu.?
|
Re: 7704A power supply fail (big leak of the main caps)
I've placed an order for some screw terminal caps, but I do have some United Chemicon KMZs (680uF/450V) at hand that may work. I'd need to jerry-rig then in there, which doesn't seem too difficult.? But I wonder what I should be looking for with caps in this application as minimum safe ratings. I assume the SMPS application with its direct line exposure and such subjects these to some hefty abuse. For instance, my particular KMZs are rated up to 2.25A ripple at 105C/120Hz.?
Any thoughts and recommendations?would be appreciated.
On Sat, Dec 24, 2022, 11:05 AM Radu Bogdan Dicher via <vondicher= [email protected]> wrote: I think the green/white wire goes to L3236, the 5V lights supply
On Sat, Dec 24, 2022, 8:48 AM Radu Bogdan Dicher via <vondicher= [email protected]> wrote: Hi all,
And Happy Holidays to all celebrating!
I've woken up the morning of Christmas Eve to a nice surprise - smoke, noises, smell, etc. Upon pulling out the power supply, I see that the main caps (computer grade Sprague caps) have failed and made a big mess inside the unit. Things have been leaking so bad this morning, I had to take it apart very quickly, and scrambled to wash off any of the goo and electrolyte. Luckily, I think this all almost happen in front of my eyes, so not much of this stuff has stayed very long on the board, but there's some more serious damage on the board and traces just below the caps.?
Some requests for input:
- what have you found best for cleaning this up? I used various sizes cotton swabs to cosmetic pads and alcohol (not single malt... ;))
- suggestions on caps replacements? I haven't started looking, but I do have some faves to search (Nebraska Surplus, etc.).?
- When scrambling to extract the caps without leaking too much in too many places I've detached a very short wire (white/green?). I really hate it when the design includes short sighted decisions like this - where a wire is too short to open up access by unfolding a board while all other wires are long enough, WTH? Would anyone know offhand where this attaches? I know this is a very long shot.?
- Does anyone have a spare, "known good," PS and is willing to depart with it??
Thank you all.
Radu.?
|
Re: 7704A power supply fail (big leak of the main caps)
I think the green/white wire goes to L3236, the 5V lights supply
On Sat, Dec 24, 2022, 8:48 AM Radu Bogdan Dicher via <vondicher= [email protected]> wrote: Hi all,
And Happy Holidays to all celebrating!
I've woken up the morning of Christmas Eve to a nice surprise - smoke, noises, smell, etc. Upon pulling out the power supply, I see that the main caps (computer grade Sprague caps) have failed and made a big mess inside the unit. Things have been leaking so bad this morning, I had to take it apart very quickly, and scrambled to wash off any of the goo and electrolyte. Luckily, I think this all almost happen in front of my eyes, so not much of this stuff has stayed very long on the board, but there's some more serious damage on the board and traces just below the caps.?
Some requests for input:
- what have you found best for cleaning this up? I used various sizes cotton swabs to cosmetic pads and alcohol (not single malt... ;))
- suggestions on caps replacements? I haven't started looking, but I do have some faves to search (Nebraska Surplus, etc.).?
- When scrambling to extract the caps without leaking too much in too many places I've detached a very short wire (white/green?). I really hate it when the design includes short sighted decisions like this - where a wire is too short to open up access by unfolding a board while all other wires are long enough, WTH? Would anyone know offhand where this attaches? I know this is a very long shot.?
- Does anyone have a spare, "known good," PS and is willing to depart with it??
Thank you all.
Radu.?
|
7704A power supply fail (big leak of the main caps)
Hi all, And Happy Holidays to all celebrating! I've woken up the morning of Christmas Eve to a nice surprise - smoke, noises, smell, etc. Upon pulling out the power supply, I see that the main caps (computer grade Sprague caps) have failed and made a big mess inside the unit. Things have been leaking so bad this morning, I had to take it apart very quickly, and scrambled to wash off any of the goo and electrolyte. Luckily, I think this all almost happen in front of my eyes, so not much of this stuff has stayed very long on the board, but there's some more serious damage on the board and traces just below the caps.? Some requests for input:
- what have you found best for cleaning this up? I used various sizes cotton swabs to cosmetic pads and alcohol (not single malt... ;))
- suggestions on caps replacements? I haven't started looking, but I do have some faves to search (Nebraska Surplus, etc.).?
- When scrambling to extract the caps without leaking too much in too many places I've detached a very short wire (white/green?). I really hate it when the design includes short sighted decisions like this - where a wire is too short to open up access by unfolding a board while all other wires are long enough, WTH? Would anyone know offhand where this attaches? I know this is a very long shot.?
- Does anyone have a spare, "known good," PS and is willing to depart with it??
Thank you all. Radu.?
|
Did Tektronix try to get screenwriters
and directors to incorporate their products into films? Whether
it was deliberate product placement or not, many techies back in
those times- myself included- were inspired to look for test
gear we saw in the movies. One drastically different item that
got a big boost with collectors was the Frieden STW-10
mechanical calculator. The? movie "Hidden Figures" from a few
years ago prominently featured them in several scenes.
?? Bruce Gentry? KA2IVY
On 12/20/22 10:26, Froggie the Gremlin
wrote:
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A walk down memory lane....
In 1968....Stanley Kubrick's "2001: A Space Oddssey" used a TEK P6006 x10 probe for checking the AE-35 unit per computer HAL-9000 fault detection.
When the testing did not confirm HAL-9000 prediction of failure, Frank Poole went EVA to exchange AE-35 (comms dish feed LNA) and the rest is for you to recall.
So the scene is central to the story line by Arthur C Clarke and Stanley Kubrick.
Now, In my boxes of 100s of old probes, I just discovered two, P6006 (10X, 25 MHz!) with tips and clips!
Your memories of old probes and 2001 A Space Odyssey are appreciated! Enjoy!
Jon
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In the film "Escape from Alcatraz" by Don Siegel - USA 1979 the metal detector at the exit of the carpentry to check that the inmates were not carrying metal objects with them was made with a TEK935A, like the one on display in my laboratory in Italy. FZ ? -----Messaggio originale-----
Da: [email protected] <[email protected]> Per conto di Froggie the Gremlin
Inviato: martedì 20 dicembre 2022 16:26
A: [email protected]
Oggetto: Re: [TekScopes2] Tek in the movies ? A walk down memory lane.... ? In 1968....Stanley Kubrick's "2001: A Space Oddssey" used a? TEK P6006 x10 probe for checking the AE-35 unit per computer HAL-9000 fault detection. ? When the testing did not confirm HAL-9000 prediction of failure, Frank Poole went EVA to exchange AE-35 (comms dish feed LNA) and the rest is for you to recall. ? So the scene is central to the story line by Arthur C Clarke and Stanley Kubrick. ? ? Now, In my boxes of 100s of old probes,? I just discovered two, P6006 (10X, 25 MHz!) with tips and clips! ? Your memories of old probes and 2001 A Space Odyssey are appreciated! Enjoy! ? Jon ? ? ? ? -- Good morning.
I have a faulty TEK 465 oscilloscope and I would like to repair it following the advice of the users of the group.
Please ask to be registered.
Thank you
Franco Zappavigna - Italy
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A walk down memory lane....
In 1968....Stanley Kubrick's "2001: A Space Oddssey" used a TEK P6006 x10 probe for checking the AE-35 unit per computer HAL-9000 fault detection.
When the testing did not confirm HAL-9000 prediction of failure, Frank Poole went EVA to exchange AE-35 (comms dish feed LNA) and the rest is for you to recall.
So the scene is central to the story line by Arthur C Clarke and Stanley Kubrick.
Now, In my boxes of 100s of old probes, I just discovered two, P6006 (10X, 25 MHz!) with tips and clips!
Your memories of old probes and 2001 A Space Odyssey are appreciated! Enjoy!
Jon
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FS: Tektronix 067-0589-00 7000 series scope module extender
For sale, Tektronix 067-0589-00 7000 series oscilloscope module extender.
?
In excellent condition. Photos on request or see posting in Test equipment for sale group
?
Asking USD$195 or best offer plus shipping
?
Shipping from Vancouver, BC Canada
Local pick up is fine
Paypal is fine.
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Hello, I'm new to this group and I'd like to submit a problem I have with my Tektronix 2230 oscilloscope : I'm trying to adjust the Y axis as per service manual instructions, to no avail.
?
The best I could achieve is this attached image below, there's no way I can expand the lower border of the outer box to the bottom of the screen.
Voltages on pins 18 and 16 of the DAC? U9220 18/16 pins (-8,6V and +5V) are spot on, R9223 value is perfect.?R9224 is set fully clockwise.?
?
Where should I look ? Suggestions ?
?
Merry Christmas to all.
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Some old classic analog modules on the stuff page
If you are an analog devices/teledyne-philbrick/zeltex kind of person, you will find two nice lots of older classic modules for your collection on the sphere stuff page here:
https://www.sphere.bc.ca/test/stuffday.html#surprise
?
also many other goodies for your christmas stocking, and PLEASE check the FREE section at the bottom, there are some nice things there to cheer you up.
?
all the best from walter & susan
sphere research corp.
https://www.sphere.bc.ca/test/index.html
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Re: Tek2465B power supply troubleshooting
Hi Craig,
Nice troubleshooting!
Aaron
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Re: Tek2465B power supply troubleshooting
With the previous readings I took and feedback back from Chuck and Ozan. ?I determined the problem wasn’t on the inverter board but on the regulator board. Schematic 10. ? Checking out the points advised on the U1290, found the pin1=15vdc and pin2=2.48vdc without removing the J208.? Did some additional checks on the +10volt Reference section as on the U1300 pin9=2.95v, pin10= 0.163vdc, pin8= 6.2vdc. ?So pin10 seems to be feedback from pin14 and it was at 0.16vdc I thought to look for something to ground. The first item on schematic was the VR1293. ?Did diode test and found it conducted both directions. ?Removed and checked same result. ?Happened to have the 152-0055-00 part. Installed and rechecked with power applied. All power supply voltages are as per the manual spec. Reinstalled in scope and operation is restored. ?Unsure what caused the VR1293 to fail but problem solved for now.?
Thanks for assistance!
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On Dec 5, 2022, at 1:23 AM, Ozan <ozan_g@...> wrote:
A ?If you pull out J208, does +10V recover? As Chuck said +10V is the reference to rest of the blocks. It could be low because of detecting a fault, removing J208 disables fault detection for +10V. If after removing J208, +10V is still low check 2.5V reference. +15V unregulated looks high enough to run the 2.5 reference, you should see the same +15V unregulated voltage at pin1 of U1290, and 2.5V at pin 2. Ozan On Sun, Dec 4, 2022 at 07:06 PM, Craig Cramb wrote:
2465B S/N B077993
Inverter card 670-7282-12
Regulator 670-7281-08
Previous repairs unknown.
Looking into a power supply that is basically non- functional on some voltages. I have removed it from the scope and connected it to power supplies loading assembly that was built by Jerry Massengale. This is perfect for checking power supply and have used it over the years. But now I’m stuck and cannot seem to see what is causing low voltage from supplies to be out of tolerance.
+87= 60vdc
+42= 19.92vdc
-15VU=-17.80vdc
+10=0.113vdc
+5VD=+4.13vdc
+5=3.3vdc
-5=-2.8vdc
-15=-1.47vdc
-8=-2.15vdc
+15=+2.58vdc
I looked into the inverter troubleshooting and built myself a +5VD primary test load and then went back to inverter troubleshooting and decided this isn’t going to help me as it seems to stop at +10vdc.
I went thru and checked the unregulated voltages at
J234b side. 1=-17vdc,2=-6.3vdc,3=gnd,4=+6.3vdc, 5=+17.3 (All a little low by 2vdc)
J233b side. 1=-6.2vdc,2=+17.2,3=+48,4=Gnd,5=+90.8. (These seem close a bit high but 1=6.2vdc is way high as per schematic)
This is where I’m at right now. If anyone would like to make any suggestions it would be greatly appreciated.
Craig Cramb
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Re: TDS8200 80E04 TDT/Sampling Module
I’d talk to Skyworks if you can.?? I’ve no idea whether the originals were “zero bias” or regular detector Schottky diodes. ? Tek “might” tell you… ?
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From: [email protected] <[email protected]> On Behalf Of Aaron via groups.io
Sent: 07 December 2022 13:21
To: [email protected]
Subject: Re: [TekScopes2] TDS8200 80E04 TDT/Sampling Module? Oh, ok. So they have beam lead pin diodes too then. I'll do more research to clarify. The Schottky makes more sense due to the lower forward bias.
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Richard
satbeginner
emissionlabs
Froggie the Gremlin
Craig Cramb
David C. Partridge