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Re: TEK 466 Analog Storage
On 2018-08-18 10:49 AM, Paul B. via Groups.Io wrote:
Hi all,This should be covered in the service manual: e.g.
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TEK 466 Analog Storage
Hi all,
I've finally got a mo to look at the 466 I bought sight-unseen a while ago. I'm not really familiar with analog storage scopes, though. I've been given to understand that after switching on (which should not be done gradually with a variac) I should see an even, dimly-glowing green screen. Is that right? And what settings should I adjust to what levels for this initial switch-on? It's been a few years since it was last powered up. thanks! |
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Re: Tek 2467b test 05 error
Also in this day and age it is not sufficient to look at the just the unit serial number. There are so many organ transplant units floating around where a previous? owner swapped an early A5 in a later serial unit and vice versa. To know what you have it is a good practice to look at the part number stamped on the board itself rather than rely on the unit top level serial number.
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-DC manuals@... On 8/18/2018 9:58 AM, machineguy59 via Groups.Io wrote:
As Siggi has mentioned, the A5 board (processor control) is a frequent source of failure in these scopes.? But Tektronix went through several design iterations of the A5 board over the years producing of the 2467B and 2465B.? So when you open up the scope take note of the configuration and condition of the A5.? Late models (serial 05xxx and later) used SMD technology and the electrolytic capacitors were prone to leaking electrolyte on critical components.? Earlier models used through hole technology that were more robust.? Both designs are covered in the Service Manual.? Both designs require a stable -1.25 and +1.36 to function properly.? It will help us help you to know which configuration of A5 you have. --
Dave Manuals@... www.ArtekManuals.com |
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Re: Tek 2467b test 05 error
As Siggi has mentioned, the A5 board (processor control) is a frequent source of failure in these scopes.? But Tektronix went through several design iterations of the A5 board over the years producing of the 2467B and 2465B.? So when you open up the scope take note of the configuration and condition of the A5.? Late models (serial 05xxx and later) used SMD technology and the electrolytic capacitors were prone to leaking electrolyte on critical components.? Earlier models used through hole technology that were more robust.? Both designs are covered in the Service Manual.? Both designs require a stable -1.25 and +1.36 to function properly.? It will help us help you to know which configuration of A5 you have.
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On ?Friday?, ?August? ?17?, ?2018? ?10?:?01?:?57? ?PM? ?CDT, Sscandizzo@... <Sscandizzo@...> wrote:
Thanks guys for the responses. I'm definitely new to scope repair.? The 2467 could not be passed up but it did come with the faults when I purchased it.? I do have an inexpensive digital scope that I hope I can use to bring this one back to life.? The other piece of info I can provide right now is that the serial number starts with B010 so I think it is a very early build. I'll need a quiet afternoon to open it up.? I will check the points you have mentioned and post my results. Best, Stefan |
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Re: Tektronix 465,NO Trigger
Good morning John,
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Yey! Seems like you've made some progress there! A reading of -7.9V on the pins 2,3 of U460 is not normal, if the input is set to EXT and the input jack is grounded... the output of the input buffer must be 0V or close to it. There's a chance that it's a FET problem, but it also can be anything like an opened resistor or diode... so you`ll have to break it down and isolate the possible causes. First thing, I would start by removing the FETs (they're socketed, so it's easy), connect a resistor of - say - 1k between pins 2,3 and ground, and measure again the voltage at pins 2,3... Voltage there should show a low voltage (my guess is that with a 1k resistor it will be something around -0.1V). This test is only to rule out that it's not U640 itself who's pulling the voltage down. Now, if the voltage at pins 2,3 is low as expected, then you know there's nothing wrong with U640, and you can probe voltages around the FETs, and measure the components around there, to see if there's nothing shorted, or opened, or anything of that sort. By looking at the initial symptom, of -7.9V at pins 2,3, my hunch is that the upper half of the input buffer was open circuited (either the FET itself, or R623, or R622). Keep hunting and let me know... Rgrds, Fabio P.S. If you find one of the FETs is damaged, you can restore almost full functionality to the scope by "stealing" the FETs from the B triggering input buffer (until you can find a new pair of FETs). The whole B trig. input and preamp only see some work when you need to use a "post delay" triggered operation (i.e., if your B triggering source lever is set to anything but "B STARTS AFTER DELAY"). The "post delay" triggered operation is not very often used. The regular use of the Delayed B sweep (where B sweep is simply triggered by the end of the delay) don't use any of the B triggering Input selector, preamplifier and even the tunnel diodes' trigger discriminator (just FYI). On Sat, Aug 18, 2018 at 08:09 AM, John Stoole wrote:
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Re: Concentric A and B time-base knobs/interlocking
I had a flash of inspiration over this; I wondered if the Z-axis modulation was functioning properly. I tried putting a sine-wave into the CH1 vertical and a square-wave into the external Z input. Whereas this gave me Z-modulation on my 464 with a bit of fiddling with the input frequencies, when the same signal were applied to my 466, I saw no Z-modulation. It still doesn't solve the peculiarities seen with the B time-base, it does give me a reason why the "A INTEN" horizontal display shows no bright-ups. Ah well, more tails to chase....
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Colin. -----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Raymond Domp Frank Sent: 14 August 2018 21:18 To: [email protected] Subject: Re: [TekScopes] Concentric A and B time-base knobs/interlocking On Tue, Aug 14, 2018 at 08:53 PM, Colin Herbert wrote: That sort of imprecise clicking thing normally is easy to correct by loosening the B knob, carefully adjusting the angle of the knob against the A knob, fastening it and repeating if necessary. You do have a nice selection of equipment! Personally, the 466 is one of my favorites in the series, if the storage is adjusted and used correctly. Raymond |
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Re: Tektronix 465,NO Trigger
John Stoole
Good Morning Fabio,
I have carried out the tests to the U640 as you suggested for both the A trigger and the B trigger here are the results A TRIG 14/15 20.4 mv 2/3 -7.9 volts !!!!!!!!!?????? B TRIG 14/15 100.7 mv 2/3 42.6 mv I noticed that all of the voltage tests in the Service Manual are carried out with the NORM button pushed, so the tests above had the NORM button in. I think I may have a problem with the FET's ?? Thanks for all the help John |
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Re: Tek 2467b test 05 error
Thanks guys for the responses.
I'm definitely new to scope repair. The 2467 could not be passed up but it did come with the faults when I purchased it. I do have an inexpensive digital scope that I hope I can use to bring this one back to life. The other piece of info I can provide right now is that the serial number starts with B010 so I think it is a very early build. I'll need a quiet afternoon to open it up. I will check the points you have mentioned and post my results. Best, Stefan |
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Re: tektronix 214 option 94/ Li-Ion fork
I wouldn't pick to much on Li-Ion chemistry. There are a lot of deployed chemistries and construction methods. Some have problems some don't, just like NiCd & NiMH. I've seen plenty of NiCD rotting in their electronics. Neither Ni has much shelf life, yet I have seen some Li devices wake up after a year on the shelf.
Realistically, all these chemistries have quirky charging and discharging requirements. But if I am designing new hardware for the masses, it is highly unlikely I would be successful selecting NiCd chemistry. Yes, Li-Ion needs a different charging means, but there chips and PCBs for that. Yes, they can balloon and catch fire sometimes. That is a manufacturing QC issue. Given the choice between a coin NiCd and a postage stamp Li-Ion for a little rechargeable gizmo device, I'd pick the Li battery every time. The coin Ni-Cd is soooo Palm-Pilot era!!!!! Kjo |
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Re: Is it possible to get an eye diagram on a TDS784?
Well an eye diagram is really just the envelope of all hi/lo & early/late levels & transitions in a data stream. Assuming that you can trigger off something relative to the stream, even old scopes with analog or digital persistence can do a decent job showing an eye.
My HP54503A monochrome 500Mhz has a trig/display mode that will do that. Of course some of the more fancy Tek/HP scope with color planes can colorized the eye with more interesting data. Which I had one of those sometimes! Kjo |
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5A18N and 5403 manuals free for postage
Hi, everybody.
I ended up with these 5A18N and 5403 manuals when I bought my 5110 scope a few months ago. Came with two 5A15N's and a 5B10N, but those manuals obviously don't apply. Let me know where you are located, and the first one or ones (I will send them separately if nobody wants both) who reply(ies) will get it/them for postage via PayPal friends and family. I'm in Southern California, USA. Enjoy! Jim --- This email has been checked for viruses by AVG. |
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Re: TG501 20ns 10ns 5ns
Thank you Fabio.
I'll have a closer look at the TG501 over the next few days - unfortunately its difficult to access any of the components on the main board without first removing the multiplier board attached to it. I think you are probably correct in pointing to the first divide by 5 stage as the problem. The 100Mhz PLL is most likely OK given that the 25ns, 12.5ns and 6.25ns values do appear to be exactly on these values and other markers derived from the 100Mhz are correct. The TG501 I have is one of the later models that has very few socketed ICs so this is less likely to be a problem, but I'll check anyway once I have access. I'll let you know how things go Regards Kerry |
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Re: User Groups
The group is in the throws of getting ready to move to Groups.io but for now is on Yahoo groups -DC NR1DX manuals@... On 8/17/2018 8:03 PM, Ken Wright via Groups.Io wrote:
Dear All. Sorry this is off topic, but is there a similar user group to this one for for HP signal generators etc. --
Dave Manuals@... www.ArtekManuals.com |
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Re: tektronix 214 option 94
Hi Miguel,
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This is the reply I got from Hakan: Dennis, I had a look again and I also went through all the 200 scopes and still not a trace of Opt 94. 214, and some of the other, has a several Customer Mods and the only one I can think of that could have made to an option even though not listed anywhere is longer probe cables which was Mod 717M in 214. Standard cables are 42" while the modified are 66". But that's only a guess. mvh/Best Regards H?kan -----Original Message----- -- Dennis Tillman W7PF TekScopes Moderator |
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Re: tektronix 214 option 94
On Fri, 17 Aug 2018 14:20:02 -0700, you wrote:
Hi Jim,You don't mention the delightful pickyness of charging Li-ion batteries. Granted that NiCd and NiMh batteries are somewhat fussy, and Lead Acid batteries are just plain heavey... Look at matching the appropriate charger with the cell chemistry. Now ask why cheaply made appliances with lithium batteries seem to catch fire... (hoverboards, cell phones, laptops, and vape cigarettes). Is it a cheaply made battery? Is it not matching the cell chemistry with the right charger..? (I am going to cheaply made batteries, myself). all of our rechargable batteries have an outstandingly miserable power density, although some are better than others. Fix that, and we have a whole bunch of good things happening.... Harvey
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Re: 2215A LVPS repair
tom jobe
The Schaffner line inlet filter replacement part I have been buying is Digikey Q467-ND
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On 8/17/2018 1:01 PM, Carsten Bormann wrote:
On Aug 17, 2018, at 18:56, garp66 <hrgerson@...> wrote:Could someone please post the model # for a replacement of the Schaffner line filter unit for a standard 120V North American powered Tek 2215a scope ?I don¡¯t know what is in the Tek scopes, but if it is a FN323-1/01 as was mentioned earlier, you want a Schaffner FN9222-1-06 (and probably some isolated quick-connect connectors and a crimper so you don¡¯t have to solder them in again). |
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Re: Tsk 2467b test 05 error
Hey Stefan,
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now that I have some time, let me expand on this a bit. My apologies if I'm preaching to choir, I don't know your level of expertise - it might save time if you're willing to divulge this ;). If not we'll typically muddle through anyhow, given sufficient patience and/or persistence on either end. I can say if you're new to this and/or electronics repair, you're in for a treat. These scopes are a joy to work on, and the service manuals are a work of art. 1. Get the service manual. There's a link on TekWiki <>. If that doesn't satisfy, I can recommend the Artek Manuals scans < >. While I don't own the 2467B manual, I did buy the 2467 one, and it's an excellent scan. 2. Measure the low voltage (LV) supplies at J119. Measure voltages and ripple both as described in the service manual. If you don't have a second scope, you can turn the 2467B on its own supplies to measure ripple and at least get a good indication. 3. If the supplies are out of spec, that's the first thing you need to address. Without correct supplies, there's no reasoning about the rest of the functionality in the scope. The spreadsheets MachineGuy pointed to are sure to be a big time saver if you need to do a full power supply recap. 4. Assuming the LV supplies are OK. This is where it gets fun - you'll have a problem on the A5 board, and/or in the trigger path, and/or in the line trigger signal. You can quickly eliminate or implicate the most usual failure in the A5 board with quick measurement of the +1.36 and/or the -1.25V references, but after that it gets a little hairier. The 2467(B) is an awesome scope - my 2467 is always my go-to for general spelunking, I hope you clear this up in yours. So, a couple of questions for you: 1. Did this fault develop while the scope was in your possession, or did you acquire it in this state? 2. Do you have a second scope you can use to diagnose this problem? Siggi On Fri, 17 Aug 2018 at 14:32 Sigur?ur ?sgeirsson <siggi@...> wrote:
On Fri, 17 Aug 2018 at 13:01 <Sscandizzo@...> wrote:1) Why would the scope appear to pass test 05 when I manually run theI don't know why this would happen, it's a mystery for you to figure out |
Raymond Domp Frank
Fabio Trevisan
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