Re: Tsk 2467b test 05 error
I¡¯ve also seen bad mux chips on the A5 board cause this same error.
Manuel
|
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). You *don¡¯t* want NOS, because even unused ones of the old style are likely to have exactly the same problem (moisture intake to a metal/paper capacitor the plastic shell of which has crazed). I put these replacements into all my HP 3457a DVMs after one of the original ones exploded (the DVM had been stored and then shipped, and that probably exacerbated the moisture problem). I strongly advise anyone who has an FN323-1/01 or similar to replace these *before* connecting line power, and, if there is absolutely no way to avoid connecting the unit to line power before the replacement, make sure there is something like a steel plate in the passageway the molten/vaporized tar will shoot out into from the back of the unit. And have a flashlight in your pocket so you can find the breaker box after the fireworks. Oh, and replace the other metal/paper RIFA (or WIMA) capacitors from the 1980s, too, if they see high-energy voltages ¡ª in particular if you already can see the crazing. But this is not quite as critical as these are much less of a bomb setup than the capacitors tar-sealed into Schaffner line filters. Gr¨¹?e, Carsten
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Re: tektronix 214 option 94
Hi Jim,
I concur about the Nickle. It isn't worth its weight in nickel.
NiCd rechargeable cells have many advantages over Li rechargeable cells as 2016 Samsung Galaxy Note 7 owners, Boeing Dreamliner owners, and even a few Tesla owners, are acutely aware of by now.
But the main advantage NiCd rechargeable cells had in 1984 when Tek was making its handheld 214 scope was that Li rechargeable cells didn't exist. According to Wikipedia () the first commercial lithium-ion battery was released in 1991 by Sony and Asahi Kasei.
I am old enough to remember when portable radios had a carrying handle, five to seven tubes, and took two batteries to operate. There was the A battery and the much larger B battery. What remains from those days is the notation sometimes used for the high side of a power supply as the "B+".
Until someone comes up with a replacement for the Li rechargeable battery that has higher storage density I guess we will have to live with cell phones that are so big you have to carry them around in a pocket. When the replacement for the Li battery finally comes along maybe cell phones will finally shrink so they are no larger than a Nickle.
Dennis Tillman W7PF
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Show quoted text
-----Original Message-----
From: Jim Ford
Sent: Friday, August 17, 2018 12:41 PM
Subject: Re: [TekScopes] tektronix 214 option 94
Uh, Dennis, that's Nickel, not Nickle. A nickle is a kind of bird, and
I have heard of people winning bets by asking the color of a
nickle. When people say, "silver", they lose the bet because the nickle
bird is green!
And I don't count nickel-cadmium batteries as my favorite rechargeable,
not by a long shot. The memory effects are terrible, cadmium is a
serious hazard, and they weigh much more than the lithium types.
Have to disagree with you there.
Jim
Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------From: Dennis Tillman W7PF
<dennis@...> Date: 8/17/18 12:12 PM (GMT-08:00) To:
[email protected] Subject: Re: [TekScopes] tektronix 214 option 94 Hi
Miguel, I would guess that around 1984 Mercury was banned in the US
around that time. But I am pretty sure Tek used rechargeable Nickle
Cadmium batteries in their scopes. Nickle Cadmium has always been the
rechargeable battery of choice by everyone.
If you notice this modification applied to instruments starting with
serial number B010100. That is the serial number of the first instrument
to come off the production line so I believe you are correct. This was a
flaw in the original rectifier circuit design that they were correcting.
I do not believe it has anything to do with Option 94. Option 94 should
have been listed in the service manual since options are always listed
in the catalog and available to the customer at the time of purchase. If
you look at the back pages of the service manual for the 214 you will
see the options listed. But there is only Option1 and 2. There is no
option 94 so the mystery remains unsolved.
I have another idea that may shed some light on this. I will ask Hakan
Hinze what he can find out.
Dennis Tillman W7PF
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of
Miguel Work
Sent: Friday, August 17, 2018 9:10 AM
To: [email protected]
Subject: Re: [TekScopes] tektronix 214 option 94
Hi Dennis, thanks for your answer, could be a modified rectifier board?
Regards
Miguel
-----Mensaje original-----
De: [email protected] [mailto:[email protected]] En nombre de
Dennis Tillman W7PF Enviado el: jueves, 16 de agosto de 2018 18:24
Para: [email protected]
Asunto: Re: [TekScopes] tektronix 214 option 94
Hi Miguel,
That is definitely an odd number for an option. Up until now I would
have said options are ALWAYS listed in the catalogs as opposed to
modifications which are never listed. But I just checked the 1983
catalog and the only options are 01 and 02 and they relate to
different mains power for use in foreign countries. Does your 214 have
an unusual power plug?
I just checked my 214 and it has no options. My option "insert" is
blank.
Dennis Tillman W7PF
-----Original Message-----
From: Miguel Work
Sent: Thursday, August 16, 2018 2:25 AM
Subject: [TekScopes] tektronix 214 option 94
Which is optino 94 for a Tektronix 214?
-- Dennis Tillman W7PF TekScopes Moderator
|
Re: Tsk 2467b test 05 error
|
It just came to my attention that a copy of the AFG5101 Service manual (070-6760-00) which I scanned back in 2005 and later updated in 2009 is missing a significant portion of the electrical parts list.
Further investigation reveals so far that the complete electrical parts list was missing as printed. Att least one source I have talked to with an original manual shows that section is missing from their original hard-copy of the manual as well.
Does anyone out there have an original manual (later printing?)? for the AFG5101 where the electrical parts list is complete (more than 5 pages)
-DC
manuals@...
--
Dave
Manuals@...
www.ArtekManuals.com
|
Re: Is it possible to get an eye diagram on a TDS784?
True, Mark.
It has been several decades since I have created or observed an eye diagram, after all.? I was thinking of how data patterns with long strings of ones or zeroes might not show the entire picture.? And I discount RZ, PAM, and other non-NRZ data formats, since I haven't worked with them.? Mainly frequency domain work these days, although for time-domain work I do prefer Tektronix products.
Thanks for adding to the discussion.? ?You have obviously had your "hands dirty" more recently than I have!
Sent from my Verizon, Samsung Galaxy smartphone
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Show quoted text
-------- Original message --------From: Mark Goldberg <marklgoldberg@...> Date: 8/17/18 12:16 PM (GMT-08:00) To: [email protected] Subject: Re: [TekScopes] Is it possible to get an eye diagram on a TDS784? Add one assumption to my statement: Assuming your data is self clocking with no clock available, has 2 or more states, transitions at fixed intervals,is random and has some sort of preamble that is fixed, you can trigger on one edge in the preamble... I assumed a clock was not available, which was the case for most of the work I did, so the data was self clocking and synced to a preamble. Of course, if a clock is available, that is better to trigger on it and all transitions can overlap, but I did not have that luxury and wanted to show how it could be done even in the no clock case. If you have a sufficient persistence, you can still see the worst case. If there is a reflection in the line that is several bits away, it's effects won't be seen until later in the data. Regards, Mark On Fri, Aug 17, 2018 at 11:53 AM, Jim Ford <james.ford@...> wrote: Usually you want to trigger on the clock.? That way all the data
transitions overlap and form the eye.? Eye closure top to bottom indicates
noise, ringing, and other amplitude anomalies.? Eye closure side to side
indicates jitter and other time-based anomalies.? But you probably knew
that.
Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------From: Mark Goldberg <
marklgoldberg@...> Date: 8/17/18? 10:28 AM? (GMT-08:00) To:
[email protected] Subject: Re: [TekScopes] Is it possible to get an eye
diagram on a TDS784?
You really should have active data if you want a worst case eye diagram.
Intersymbol interference, jitter and line reflections will vary depending
on the data. Assuming your data has 2 or more states, transitions at fixed
intervals,is random and has some sort of preamble that is fixed, you can
trigger on one edge in the preamble and then look at the eye later down the
data where it is random and see the worst case with a long persistence
setting. I don't know if this will work for your data. Hold off may help
triggering where you want.
Regards,
Mark
On Fri, Aug 17, 2018 at 9:46 AM, dnmeeks <dan-meeks@...> wrote:
InstaVu seems like the right place to start, but I don't know a way to
trigger properly (on both edges). Has anyone done this on this vintage
scope?
Thanks
Dan
|
Hello Mark,
I had a 464 and mine had H.V. problems... so I know quite well this one.
Well... There is no test that will give you absolute certainty that T1501 is in working order, besides seeing the circuit itself working, but there are a few things you CAN do.
Be warned, however, that to diagnose / troubleshoot this circuit, you will need to remove the H.V. protection shields and you will be playing with a toy that can bite you big time.
Use the usual caution measures... Insulated shoes or floor mat, keep one hand on your pocket, and preferably, have someone nearby.
Past the histeric precautions
1. First of all, make sure you have +15V UNREG past the fuse F1487, reaching pin 5 of T1501 and leaving the other side of its primary, pin 6, and to the PCB tab that goest to the collector wire of Q1486.
2. Since Q1486 is a TO-3 transistor, and the collector terminal is fastened with a screw and terminal... checking only where the wire leaves the PCB won't tell you much if the screw is lose.
The only way to be sure here is unsolder the 3 wires from the PCB, unscrew the 2 bolts that hold the transistor cage and slide it out (from the 464's right side).
While you have the transistor cage and transistor in your hands, make sure the screws are well fastened, that the collector wire makes good contact to the transistor's case, and take the opportunity to test the transistor, if not with a transistor tester, at least a full diode test in all the junctions. Beware of old ohmmeters that uses 12V batteries when measuring the E-B junction in reverse, as this can irreversibly (and unpredictably) damage the transistor.
Take the opportunity as well to make sure that the transistor case is not making contact to the cage (in case the insulated washer gets crushed by too much tightening).
When all is right, put the transistor back in place and solder the wires.
Last but not least, check the part number of the transistor... if it's an original Tek Transistor (and if it's the right part number) or if it's an industry standard (e.g. 2N3055).
3. Take transistor Q1492 out (to rule-out that the oscillator is being "shut-down" by this protection transistor (It's just for a while... you won't actually run the scope without it).
4. Take transistor Q1484 out as well (this transistor adds juice to the oscillator, but even without it, the oscillator must be able to run on its own).
5. Hook a voltmeter to pin 3 of the transformer (where it's connected to the emitter of Q1484).
6. Turn on the scope, while monitoring the voltage on the voltmeter...
6.A.If it goes negative, it means the oscillator started. It would usually take no longer than a couple of seconds to start oscillating.
Turn the power down and try to insert both transistors back, turn the power on again and see if your problem is solved.
6.B. If it stays positive, the oscillator is stuck... That can have many causes, including an inadequate Q1484 or a faulty T1501 or many other things yet, (even a worn out C1487)
Let us know the outcome.
Rgrds,
Fabio
|
Re: tektronix 214 option 94
Uh, Dennis, that's Nickel, not Nickle.? A nickle is a kind of bird, and I have heard of people winning bets by asking the color of a nickle.? When people say, "silver", they lose the bet because the nickle bird is green!
And I don't count nickel-cadmium batteries as my favorite rechargeable, not by a long shot.? The memory effects are terrible, cadmium is a serious hazard, and they weigh much more than the lithium types.
Have to disagree with you there.
Jim
Sent from my Verizon, Samsung Galaxy smartphone
toggle quoted message
Show quoted text
-------- Original message --------From: Dennis Tillman W7PF <dennis@...> Date: 8/17/18 12:12 PM (GMT-08:00) To: [email protected] Subject: Re: [TekScopes] tektronix 214 option 94 Hi Miguel, I would guess that around 1984 Mercury was banned in the US around that time. But I am pretty sure Tek used rechargeable Nickle Cadmium batteries in their scopes. Nickle Cadmium has always been the rechargeable battery of choice by everyone. If you notice this modification applied to instruments starting with serial number B010100. That is the serial number of the first instrument to come off the production line so I believe you are correct. This was a flaw in the original rectifier circuit design that they were correcting. I do not believe it has anything to do with Option 94. Option 94 should have been listed in the service manual since options are always listed in the catalog and available to the customer at the time of purchase. If you look at the back pages of the service manual for the 214 you will see the options listed. But there is only Option1 and 2. There is no option 94 so the mystery remains unsolved. I have another idea that may shed some light on this. I will ask Hakan Hinze what he can find out. Dennis Tillman W7PF -----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of
Miguel Work
Sent: Friday, August 17, 2018 9:10 AM
To: [email protected]
Subject: Re: [TekScopes] tektronix 214 option 94
Hi Dennis, thanks for your answer, could be a modified rectifier board?
Regards
Miguel
-----Mensaje original-----
De: [email protected] [mailto:[email protected]] En nombre de Dennis
Tillman W7PF Enviado el: jueves, 16 de agosto de 2018 18:24
Para: [email protected]
Asunto: Re: [TekScopes] tektronix 214 option 94
Hi Miguel,
That is definitely an odd number for an option. Up until now I would
have said options are ALWAYS listed in the catalogs as opposed to
modifications which are never listed. But I just checked the 1983
catalog and the only options are 01 and 02 and they relate to different
mains power for use in foreign countries. Does your 214 have an unusual
power plug?
I just checked my 214 and it has no options. My option "insert" is
blank.
Dennis Tillman W7PF
-----Original Message-----
From: Miguel Work
Sent: Thursday, August 16, 2018 2:25 AM
Subject: [TekScopes] tektronix 214 option 94
Which is optino 94 for a Tektronix 214?
--
Dennis Tillman W7PF
TekScopes Moderator
-- Dennis Tillman W7PF TekScopes Moderator
|
Re: Is it possible to get an eye diagram on a TDS784?
Add one assumption to my statement:
Assuming your data is self clocking with no clock available, has 2 or more
states, transitions at fixed
intervals,is random and has some sort of preamble that is fixed, you can
trigger on one edge in the preamble...
I assumed a clock was not available, which was the case for most of the
work I did, so the data was self clocking and synced to a preamble.
Of course, if a clock is available, that is better to trigger on it and all
transitions can overlap, but I did not have that luxury and wanted to show
how it could be done even in the no clock case. If you have a sufficient
persistence, you can still see the worst case. If there is a reflection in
the line that is several bits away, it's effects won't be seen until later
in the data.
Regards,
Mark
toggle quoted message
Show quoted text
On Fri, Aug 17, 2018 at 11:53 AM, Jim Ford <james.ford@...> wrote: Usually you want to trigger on the clock. That way all the data
transitions overlap and form the eye. Eye closure top to bottom indicates
noise, ringing, and other amplitude anomalies. Eye closure side to side
indicates jitter and other time-based anomalies. But you probably knew
that.
Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------From: Mark Goldberg <
marklgoldberg@...> Date: 8/17/18 10:28 AM (GMT-08:00) To:
[email protected] Subject: Re: [TekScopes] Is it possible to get an eye
diagram on a TDS784?
You really should have active data if you want a worst case eye diagram.
Intersymbol interference, jitter and line reflections will vary depending
on the data. Assuming your data has 2 or more states, transitions at fixed
intervals,is random and has some sort of preamble that is fixed, you can
trigger on one edge in the preamble and then look at the eye later down the
data where it is random and see the worst case with a long persistence
setting. I don't know if this will work for your data. Hold off may help
triggering where you want.
Regards,
Mark
On Fri, Aug 17, 2018 at 9:46 AM, dnmeeks <dan-meeks@...> wrote:
InstaVu seems like the right place to start, but I don't know a way to
trigger properly (on both edges). Has anyone done this on this vintage
scope?
Thanks
Dan
|
Re: tektronix 214 option 94
Hi Miguel,
I would guess that around 1984 Mercury was banned in the US around that time. But I am pretty sure Tek used rechargeable Nickle Cadmium batteries in their scopes. Nickle Cadmium has always been the rechargeable battery of choice by everyone.
If you notice this modification applied to instruments starting with serial number B010100. That is the serial number of the first instrument to come off the production line so I believe you are correct. This was a flaw in the original rectifier circuit design that they were correcting.
I do not believe it has anything to do with Option 94. Option 94 should have been listed in the service manual since options are always listed in the catalog and available to the customer at the time of purchase. If you look at the back pages of the service manual for the 214 you will see the options listed. But there is only Option1 and 2. There is no option 94 so the mystery remains unsolved.
I have another idea that may shed some light on this. I will ask Hakan Hinze what he can find out.
Dennis Tillman W7PF
toggle quoted message
Show quoted text
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of
Miguel Work
Sent: Friday, August 17, 2018 9:10 AM
To: [email protected]
Subject: Re: [TekScopes] tektronix 214 option 94
Hi Dennis, thanks for your answer, could be a modified rectifier board?
Regards
Miguel
-----Mensaje original-----
De: [email protected] [mailto:[email protected]] En nombre de Dennis
Tillman W7PF Enviado el: jueves, 16 de agosto de 2018 18:24
Para: [email protected]
Asunto: Re: [TekScopes] tektronix 214 option 94
Hi Miguel,
That is definitely an odd number for an option. Up until now I would
have said options are ALWAYS listed in the catalogs as opposed to
modifications which are never listed. But I just checked the 1983
catalog and the only options are 01 and 02 and they relate to different
mains power for use in foreign countries. Does your 214 have an unusual
power plug?
I just checked my 214 and it has no options. My option "insert" is
blank.
Dennis Tillman W7PF
-----Original Message-----
From: Miguel Work
Sent: Thursday, August 16, 2018 2:25 AM
Subject: [TekScopes] tektronix 214 option 94
Which is optino 94 for a Tektronix 214?
--
Dennis Tillman W7PF
TekScopes Moderator
-- Dennis Tillman W7PF TekScopes Moderator
|
Re: Is it possible to get an eye diagram on a TDS784?
Usually you want to trigger on the clock.? That way all the data transitions overlap and form the eye.? Eye closure top to bottom indicates noise, ringing, and other amplitude anomalies.? Eye closure side to side indicates jitter and other time-based anomalies.? But you probably knew that.
Sent from my Verizon, Samsung Galaxy smartphone
toggle quoted message
Show quoted text
-------- Original message --------From: Mark Goldberg <marklgoldberg@...> Date: 8/17/18 10:28 AM (GMT-08:00) To: [email protected] Subject: Re: [TekScopes] Is it possible to get an eye diagram on a TDS784? You really should have active data if you want a worst case eye diagram. Intersymbol interference, jitter and line reflections will vary depending on the data. Assuming your data has 2 or more states, transitions at fixed intervals,is random and has some sort of preamble that is fixed, you can trigger on one edge in the preamble and then look at the eye later down the data where it is random and see the worst case with a long persistence setting. I don't know if this will work for your data. Hold off may help triggering where you want. Regards, Mark On Fri, Aug 17, 2018 at 9:46 AM, dnmeeks <dan-meeks@...> wrote: InstaVu seems like the right place to start, but I don't know a way to
trigger properly (on both edges). Has anyone done this on this vintage
scope?
Thanks
Dan
|
Re: Tektronix 465,NO Trigger
Hi John,
Ok... So it seems there's a strong DC offset pushing/pulling the A Triggering pre-amplifier way out-of-range.
There can be several causes to it.
My own 464, for instance, had a defective FET on the Tirggering pre-amplifier input buffer.
From this point on, I can't guide you much further without knowing what version of Trigger board you have... So that I can grab the correct schematics and give you objective instructions of where to try to measure things up.
If it's convenient for you, take a picture of the board and send me PM, and I can post the picture on the Tekscopes photo area.
Rgrds,
Fabio
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On Fri, Aug 17, 2018 at 01:17 PM, John Stoole wrote:
Hi Fabio, I carried out the following test .....
While pressing the Trig View, press also the Beam Finder (you should see the
trace either stuck near the top or the bottom of the screen).
While keeping both pressed, move the A Trigger Level, to see if the trace
shows any tendency to move towards the center of the screen...
This will give you some hints if the trigger preamplifier is really stuck at
some DC level, or if it still reacts to the A trig
When pushing the Trig View, /Beam Finder, I get a short trace near the bottom
of the screen, but moving the A Trigger Level, has no effect at all
John
On 17 August 2018 at 13:38 Fabio Trevisan <fabio.tr3visan@...> wrote:
Hi John,
No problem about the time... It's a relief for my mind to solve those puzzles.
Some comments further down, just after your answers...
Regards,
Fabio
On Fri, Aug 17, 2018 at 07:16 AM, John Stoole wrote:
Hello Fabio , I decided to contact you direct in case I want to send you any photos of my problems here,
Firstly I want to thank you for the very detailed help you sent me, it
must have taken up a lot your your valuable time and it is much appreciated.
I have now completed all the suggestions that you made with no results but
here are some of the things that I found
1. A trigger level control has no effect with any of the switch positions
3. Pressing the TRIG VIEW I have a blank screen Hmmm... Both things above together, may mean that the triggering signal,
through the triggering input and pre-amplifier stages may be so much offset in
D.C. that the triggering signal coming out of the pre-amplifier into the
triggering discriminator (Tunnel Diodes or Tek Custom IC yet to be clarified)
is never crossing the 0V (which is a must, for the trig. discriminator to
operate).
**Please try this one more thing**
While pressing the Trig View, press also the Beam Finder (you should see the trace either stuck near the top or the bottom of the screen).
While keeping both pressed, move the A Trigger Level, to see if the trace shows any tendency to move towards the center of the screen...
This will give you some hints if the trigger preamplifier is really stuck at some DC level, or if it still reacts to the A trig level pot.
2. If I switch the A COUPLING to DC, then as I step the SOURCE switch from
NORM to EXT10 the trigger lamp flashes proving the lamp is OK
This is good! It gives us some indication that the triggering discriminator is working... It's probably detecting the triggering signal crossing 0V, when
you're changing selections, which is probably causing some change in the DC
levels at the input stages...
4. the TRIG HOLD OFF control works well and helps to lock the waveform
when moved
Expected... The Sweep control logic seems to be working, otherwise there wouldn't be a trace whatsoever.
5 Tried 5 v AC into the external trigger but that would not sync the
waveform
This indicates that whatever the problem is, it's probably at or after the trigger pre-amplifier input selector (e.g. it sort of rules-out that your
problem is at the pick-off circuitry).
In time, the pick-off circuitry are the pieces of circuitry of the Vertical pre-amplifiers that "taps" the vertical signal from Channel 1, Channel 2 or
from after the channel Alternating circuit (the NORM pick-off) and routes it
to the trigger preamp.
If the problem would be at the pick-off circuitry (only), you would still be able to trigger from an EXT input.
the rest of the scope seems to work very well
I will continue to hunt around the the voltages to see if I can find any
serious deviations for the service manual voltages
To further help you from this point on, we will need to know:
A. What kind of Trigger pre-amp board your 465 has. I`m not even sure if this "doubt" applies to the 465, but I used to have a 464 and I know that (for
the 464 at least) there were two versions of Trigger boards, one that uses
Tunnel Diodes, and another one that uses a Tek custom IC (as the triggering
signal discriminator).
Many thanks again for the help
regards
John
|
Re: Tsk 2467b test 05 error
On Fri, 17 Aug 2018 at 13:01 <Sscandizzo@...> wrote: 1) Why would the scope appear to pass test 05 when I manually run the
diagnostics but fail on start-up? This probably doesn't change the
solution, just curious.
I don't know why this would happen, it's a mystery for you to figure out :). It might be because I'm pointing you in the wrong direction, and what's actually happening is e.g. that the trigger hybrid's connections have oxidized, and you have temperature-dependent intermittence. You might have a bad U500 trigger hybrid - it happens. It might also be because the leaked electrolyte changes its characteristics or evaporates to an extent after conducting for a while. The 05 tests effectively compare DAC-generated voltages to the line trigger input by means of the trigger hybrid, so anything involved in that process might be at fault. However, the most common failure by far leading to the 05 errors in the 24X5B scopes, is leaking electrolytics. You can conclusively answer the question of whether your DAC's compromised by opening the scope up and measuring the +1.36 and -1.25V reference voltages on the A5 board. This is the board on the right side of the scope, very easy to get to once the case is off. Even if those are good, you want to do a close visual inspection of the four SMD caps on that board and surrounding components.
2) Has anyone created a comprehensive list of the caps necessary for a
full overhaul? I'd rather not re-invent the wheel if such information has
already been collected.
There are only 4 of those SMD capacitors on the A5 board, and I don't think I've ever heard of SMD caps anywhere else in those scopes. If you want to e.g. do a full power supply recap, there are recent threads here that will refer you to spreadsheets that I've never consulted. The caps in question, however, have nothing to do with the power supply, they're just bulk decoupling caps for the A5 board.
|
can anyone advise me on a 464 ? there is no hv. checked all power supply voltages.they are ok.the hv oscillator is not running.i cant make any sense of the voltage readings i am getting on the transistors in the circuuit. they are all wrong. i suspect T1501 hv trans may be the cause. i do have schematic.
can anyone advise me on this problem ? thanks Mark D.
|
Re: Is it possible to get an eye diagram on a TDS784?
Yes it's definitely possible on TDS7xx. It's a bit better on the later versions (i.e. 7xxD vs 7xxA) because InstaVu was improved to include grading. Intensity is visible through color mapping. You want to trigger on only one waveform, then change horizontal position to 3-5 events further down the line and use your persistence adjustment to fine tune your eye.?
--Eric
Sent from my Samsung Galaxy smartphone.
toggle quoted message
Show quoted text
-------- Original message --------From: Mark Goldberg <marklgoldberg@...> Date: 8/17/18 12:28 PM (GMT-06:00) To: [email protected] Subject: Re: [TekScopes] Is it possible to get an eye diagram on a TDS784? You really should have active data if you want a worst case eye diagram. Intersymbol interference, jitter and line reflections will vary depending on the data. Assuming your data has 2 or more states, transitions at fixed intervals,is random and has some sort of preamble that is fixed, you can trigger on one edge in the preamble and then look at the eye later down the data where it is random and see the worst case with a long persistence setting. I don't know if this will work for your data. Hold off may help triggering where you want. Regards, Mark On Fri, Aug 17, 2018 at 9:46 AM, dnmeeks <dan-meeks@...> wrote: InstaVu seems like the right place to start, but I don't know a way to
trigger properly (on both edges). Has anyone done this on this vintage
scope?
Thanks
Dan
|
Re: Is it possible to get an eye diagram on a TDS784?
You really should have active data if you want a worst case eye diagram.
Intersymbol interference, jitter and line reflections will vary depending
on the data. Assuming your data has 2 or more states, transitions at fixed
intervals,is random and has some sort of preamble that is fixed, you can
trigger on one edge in the preamble and then look at the eye later down the
data where it is random and see the worst case with a long persistence
setting. I don't know if this will work for your data. Hold off may help
triggering where you want.
Regards,
Mark
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On Fri, Aug 17, 2018 at 9:46 AM, dnmeeks <dan-meeks@...> wrote: InstaVu seems like the right place to start, but I don't know a way to
trigger properly (on both edges). Has anyone done this on this vintage
scope?
Thanks
Dan
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I took the quick and easy way: I harvested one from a recently died cd-player that happened to have a similar size line filter in it. It was only a few years old, so way newer than my 2215A.. :-)
So sorry, no model number here...
Un saludo,
Leo
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Re: Tsk 2467b test 05 error
Hi Siggi,
Thank you for the explanation. Two followup questions:
1) Why would the scope appear to pass test 05 when I manually run the diagnostics but fail on start-up? This probably doesn't change the solution, just curious.
2) Has anyone created a comprehensive list of the caps necessary for a full overhaul? I'd rather not re-invent the wheel if such information has already been collected.
Best,
Stefan
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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 ?
Would this new "mysterious" replacement line filter unit also work in the 2235 & 2465 Tek scope Series;
Or are there different models of the New replacement line filter for each scope, individually ?
-- Brand, Model # & sources (web links) for the New replacement Line Filters, please.
thank you !
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Is it possible to get an eye diagram on a TDS784?
InstaVu seems like the right place to start, but I don't know a way to trigger properly (on both edges). Has anyone done this on this vintage scope?
Thanks
Dan
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Fabio Trevisan
satbeginner