Date   

Re: Tektronix PS280

Malcolm Hunter
 

On 3 January 2018 at 15:10, magnustoelle via Groups.Io <
magnustoelle=yahoo.com@groups.io> wrote:

Ah, well, I have just read the official Tektronix manual 061-4124-02 for
the PS-280.
And the adjustments for calibration are also included there - see
https://www.tek.com/ps280-manual/bench-test-instruments-and-
handheld-oscilloscopes-technical-reference

​Qservice sells the service manual with schematics.

Malcolm


Re: Tektronix PS280

magnustoelle
 

Ah, well, I have just read the official Tektronix manual 061-4124-02 for the PS-280.
And the adjustments for calibration are also included there - see https://www.tek.com/ps280-manual/bench-test-instruments-and-handheld-oscilloscopes-technical-reference


Cheers,
Magnus

On 03/01/2018 15:52, magnustoelle via Groups.Io wrote:
Good Day,

I can absolutely confirm this assessment about the PS280.
This was an OEM-design for Tektronix made by Goodwill Instruments / Taiwan and China. Model GW GPC-3020D.
Common practice in the T&M equipment industry.

And - great minds think alike - I have also modified my unit to reduce the fan noise - same as Twig did.
Hint: The rear heat sink has a spare place. It's basically intended for four TO-3 transistors. But the design uses only three of these. So, I have cheated and used the free place for a very simple, NTC-controlled fan speed driver with a 2N3055.

Please let me know if you need the service manual. Some postings in several internet forums claim that there is none, but I have one available here.
Schematics are not included, but the test and calibration instructions are complete.

Cheers,

Magnus

On 30/12/2017 21:47, Twig wrote:
2. The internal fan is very noisy. I did a mod to add a thermistor-controlled fan speed drive to get some peace and quiet. May not be an issue on the versions without the black heatsink on the rear.


Re: First draft of the Tek knob visual index project

 

Yes, that will be used to fill in any missing details once all the other data, especially photos, are in. that document is not especially helpful for identifying knobs, which is why I started this project in the first place. At this point, I have a pretty deep selection of visuals (turns out I had more of the original style knob pics than I thought), and I have also written an overview of the three big chronological waves of design that affected these knobs and how they were created and used. It is interesting to see how they evolved over time, and I have made up displays for each era to show the styles.

I think the final doc will be very useful, it has already solved a few mysteries for me here while I was working on it. The "used on" data would be very helpful, but only Hakan has that, and it is on literally hundreds of microfiche documents and thus is very hard to work from, I think I will just have to work back from other information to fill that portion in..

all the best,
walter (walter2 -at- sphere.bc.ca)
sphere research corp.


Re: Tektronix PS280

magnustoelle
 

Good Day,

I can absolutely confirm this assessment about the PS280.
This was an OEM-design for Tektronix made by Goodwill Instruments / Taiwan and China. Model GW GPC-3020D.
Common practice in the T&M equipment industry.

And - great minds think alike - I have also modified my unit to reduce the fan noise - same as Twig did.
Hint: The rear heat sink has a spare place. It's basically intended for four TO-3 transistors. But the design uses only three of these. So, I have cheated and used the free place for a very simple, NTC-controlled fan speed driver with a 2N3055.

Please let me know if you need the service manual. Some postings in several internet forums claim that there is none, but I have one available here.
Schematics are not included, but the test and calibration instructions are complete.

Cheers,

Magnus

On 30/12/2017 21:47, Twig wrote:
2. The internal fan is very noisy. I did a mod to add a thermistor-controlled fan speed drive to get some peace and quiet. May not be an issue on the versions without the black heatsink on the rear.


Re: TDS-520

Siggi
 

On Wed, 3 Jan 2018 at 00:44 jafinch78 . <jafinch78@gmail.com> wrote:

I was able to review the schematic and all the missing resistors are 0 Ohm.

The only resistor I can't find on the schematic is R1998. I have R1999 on
my board and is 0 Ohm.

Am I safe to say R1998 is 0 Ohm or does anyone know on their TDS-520 what
R1998 is?
On which schematic page did you find R1999? To determine whether R1998 is a
strapping resistor, you might see whether one of the unused pads shares a
track with one end of R1999. If so, then it's likely that their purpose is
to select some kind of an alternative.

Also, are the 0 Ohm resistors 1%, 0.125W, TC=100PPM, 1206, T&R like on the
TDS-520B?

Would be nice to have volume 1 also of the component level service manual
available.
Artek Manuals will sell you Volume 1 & 2 in a very good scan.


Re: TDS-520

Siggi
 

On Sun, 31 Dec 2017 at 22:46 jafinch78 . <jafinch78@gmail.com> wrote:

I appreciate you dealing with the PITA issue. Thanks for your time. No
hurry on my end as I am taking a break for the holidays to do more not as
technical projects, plus I did find the manual though there is only volume
2 (070-8313-00). Any ideas on volume 1? At least volume 2 has A10 through
A21 modules detailed. Man, schematics are a PITA on a laptop.

What is a strapping resistor... like a resistor placed to make a trace
bridge basically so different models can use different values or "strap"
directly?
Yeah, a 0 Ohm resistor is essentially just a link, and here they tie an
input line on an IO register either high or low. There's a note regarding
R6-R17 on the schematic:

"VERSION ID RESISTOR PLACEMENT:
PLACE U4 AND R12-517 ONLY ON BOARDS THAT HAVE EXCEEDED THE ID NUMBER
11110XXX.
IN THIS CASE, THE VERSION NUMBER IS DECODED VIA PINS 2, 3, 4 OF U4.
R7, R9, R11 ARE NOT PLACED & PINS 5-9 OF U3 ARE WIRED HIGH."


Seems I read somewhere that in the firmware the scopes can determine what
hardware model boot processes to load based on resistor configurations like
you note.

Is that correct? I guess that would be the EPROM instructing the Firmware
chips. Though aren't the Firmware chips on the firmware board for the
TDS-520?

I'm guessing the hardware version relates to such things as CPU clock rate
and maybe processor type, and perhaps other features of the CPU board. The
ACQ board has its own ID and storage for calibration data.


I am guessing later models use the NVRAM since looks like later model
boards have two Dallas/Maxim NVRAM chips. Is that correct?
I don't know - maybe someone else here does.



Seems I read somewhere in later models... that was changed so there are no
firmware modules.

Thanks and I appreciate you taking the time to look into.

Happy Holidays!




Re: TDS-520

jafinch78 .
 

On Tue, Jan 2, 2018 at 09:44 pm, jafinch78 . wrote:


0 Ohm resistors 1%, 0.125W, TC=100PPM, 1206, T&R
I'm thinking 0 Ohm would just be jumper since just strapping as noted above.


Re: TDS-520

jafinch78 .
 

I was able to review the schematic and all the missing resistors are 0 Ohm.

The only resistor I can't find on the schematic is R1998. I have R1999 on my board and is 0 Ohm.

Am I safe to say R1998 is 0 Ohm or does anyone know on their TDS-520 what R1998 is?

Also, are the 0 Ohm resistors 1%, 0.125W, TC=100PPM, 1206, T&R like on the TDS-520B?

Would be nice to have volume 1 also of the component level service manual available.


Re: 5440 No Trace

Rick
 

The brand new HV multiplier arrived today. I popped it in and the trace came right back. Everything is looking good. In fact R410 stays very cool. Looking good.

When I put the HV cover back, turned it back on and there was no trace. I didn't realize that R410 was close enough to touch the HV cover and shorted the 44 volt line to ground. I moved it away and the trace didn't come back. I figured I blew the fuse. Fuses all good. All voltage rails are good on LV board and coming into the HV board. Nothing at -3kV test point. Yikes. This is frustrating. I guess I'll undo the multiplier and see if the -3kV comes back. If it does then I guess screwed up the new multiplier.


Re: 7704A Mainframe Panel Lights No-Op

Harvey White
 

On Tue, 02 Jan 2018 17:43:38 -0800, you wrote:

Albert,

You nailed it! Would have blown right by that in my rush to get to the A32 board to check the +5V supply! So, articulating it a few times brought the lights back. Talk about feeling really dumb!

Well, that gets me back to square one but with a little more knowledge than before. The individual B SOURCE TRIGGER lights don't work but I have reason to suspect that it is the +5 lights connection to board 14. One rainy weekend, I will tear down the front and poke around with a probe but, for now, that's good enough!

Sincere thanks! As good as the service manuals are, they do not seem to address these trivial problems in a readily researchable manner.
The military, or at least the defense contractors, had the desire to
have smart diagnostics carried out by something resembling a data
tablet. You'd plug it into an aircraft, and it would interact, do
tests, and then recommend the proper repair procedure. Given the
amount of smarts in a 7000 series mainframe (and guessing how much
space is left in the only one that *had* a processor in it), the plug
in diagnostic link wouldn't be possible.

However, a decision tree on a per-topic basis would be possible, at
least to some extent. It couldn't be hosted in the scope, but could
be hosted in another piece of equipment.

Possible to do, but I'm not sure how easy. Given the basic logical
framework implementing the decision tree, you could adapt it to any
number of projects, but how close that logic could get is another
matter.

The accuracy and depth of the decision tree for troubleshooting varied
from manual to manual, if it was there at all. Lately, it of course
goes to "replace Axxx board", or "return to factory for repair".


Harvey


Re: 7704A Mainframe Panel Lights No-Op

k6whp
 

Albert,

You nailed it! Would have blown right by that in my rush to get to the A32 board to check the +5V supply! So, articulating it a few times brought the lights back. Talk about feeling really dumb!

Well, that gets me back to square one but with a little more knowledge than before. The individual B SOURCE TRIGGER lights don't work but I have reason to suspect that it is the +5 lights connection to board 14. One rainy weekend, I will tear down the front and poke around with a probe but, for now, that's good enough!

Sincere thanks! As good as the service manuals are, they do not seem to address these trivial problems in a readily researchable manner.

--
William, k6whp
"A friend told me to cheer up, things could be worse.
So I cheered up and, sure enough, things got worse!"


Re: Attention Hakan

Artekmedia <manuals@...>
 

Maybe it thinks my ISP is a spammer?

Got an alternative?
-DC

On 1/2/2018 7:02 PM, zenith5106 wrote:
Strange

It is for sure a live account. I get mails on it every day.

/Håkan


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


Re: Attention Hakan

 

Strange

It is for sure a live account. I get mails on it every day.

/Håkan


Attention Hakan

Artekmedia <manuals@...>
 

Hakan

I tried to reply to your email but hahi@telia.com was returned as "undeliverable" ??

Dave
manuals@artekmanuals.com

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


Re: First draft of the Tek knob visual index project

tronix_cal
 

Are you using the Common Design Parts Catalog for any part of the project? While it doesn't have the useable on code (Knob to Model number) listing, the dimensions, logos, labeling, method of manufacture (molded/machined) and ID/OD info is all there, with a directory of drawings. I know of a hard copy I could borrow. The data could be extracted, without outright copying of the entire content, couldn't it?


Re: 7704A Mainframe Panel Lights No-Op

Albert Otten
 

On Mon, Jan 1, 2018 at 10:26 pm, William wrote:


(seems like this guy is rebelling against me or is deteriorating.)

The panel light for the controls in the front middle of the mainframe are
dead. That is the button lights for the Vertical and Horizontal Mode buttons
have gone out. (Scope still works.) Additionally, the A and B trigger Source
lights no longer work as well. Before some worked and some did not. Now the
whole thing is dark.

In looking at the service manual, I stumbled onto page 6-3 and note that there
are four boards ("board 11", "board 12", "board 13", "board 14" which are
Vertical Mode, Horizontal Mode, A Trigger Source, and B Trigger Source
respectively.) and each of these is supplied with a "+5V Lights" source from
the Calibrator Board 10 but the schematic shows no originating source and I
have not been inside the uni yet to see what's what.

Anyone troubleshoot this problem and can offer advise and information?

Thanks in advance.
--
William, k6whp
"A friend told me to cheer up, things could be worse.
So I cheered up and, sure enough, things got worse!"
This can't be a big problem. Must be a bad contact somewhere, with just a very few places to check.The 5V(lights) is generated bij the SMPS diagram <8> but is also used there in the balance input to the SMPS control IC . So the source should be OK.
From there the 5V(lights) goes to the rear panel illumination on/off switch. Did you exercise that switch a few times?
Next via board 32 <9> and P32G to the Main Interface Board at <2>. The plugins get their 5V(lights) from the main interface board. So please check P32G for good contact.

Albert


Re: Need to borrow 5L4N and 7L18 manuals to scan

Artekmedia <manuals@...>
 

Chuck rt all

I know there is a final 7L18 manual. Somewhere I have the 070-xxxx-xx part number for it written down. You are right in that case there are few if any differences ( I still own a 7L18 myself) .

I understand from a 5L4N owner that the prelim manuals available do not match his unit in a couple of significant places and thus the search for a final version of that one.

Cheers
-DC
manuals@artekmanuals.com

On 1/2/2018 10:50 AM, Chuck Harris wrote:
Back in the day, I got my 7L18 manual from Deane Kidd,
at his farm in Oregon. My manual was marked preliminary,
and I asked him about that.

Although I vividly remember the diesel mechanics shop
building, that he had built for his son and repurposed
as a tektronix manual library, and I distinctly remember him
searching and finding the 7L18 manual on the vast shelves of
manuals, I am a little fuzzy on the following:

He either told me that the preliminary manual was the same
as the final, or he told me that there never was a final
version of the 7L18 manual.

From having used the manual, I can say that it was vast and
extensive, but it also seemed incomplete in some ways...

-Chuck Harris

Artekmedia wrote:
HNY everyone !

I am looking for service manuals for the 5L4N and 7L18 spectrum analyzer plug-ins for
the 5000 and 7000 series scopes respectively. What I need are the final full release
versions of these service manuals. There are free downloads out there that of the
"PRELIMINARY" service manuals of both these units . I have my own scan of the prelim
7L18 and there is a copy of the prelim 5L4N on one of the better known free download
sites. PLEASE DO NOT POINT ME AT THESE ! What I need is a OEM Paper copy of the full
up final release of the manuals. I would like to borrow these to scan with the carrot
of providing a couple of free downloads from our web site as payment for the favor.
In 18 years of doing this I have never lost or damaged a loaner manual so this should
be a low risk proposition. Depending on your current point of view I am fortunately
or unfortunately located in the USA so offers to loan me a manual if you live outside
the USA while appreciated in sentiment are not financially practical.

May the gods of stagnate water smile favorably upon all of you and your offspring in
the year to come

-DC
manuals@artekmanuals.com
--
Dave
Manuals@ArtekManuals.com
www.ArtekManuals.com


Re: Need to borrow 5L4N and 7L18 manuals to scan

Chuck Harris <cfharris@...>
 

Back in the day, I got my 7L18 manual from Deane Kidd,
at his farm in Oregon. My manual was marked preliminary,
and I asked him about that.

Although I vividly remember the diesel mechanics shop
building, that he had built for his son and repurposed
as a tektronix manual library, and I distinctly remember him
searching and finding the 7L18 manual on the vast shelves of
manuals, I am a little fuzzy on the following:

He either told me that the preliminary manual was the same
as the final, or he told me that there never was a final
version of the 7L18 manual.

From having used the manual, I can say that it was vast and
extensive, but it also seemed incomplete in some ways...

-Chuck Harris

Artekmedia wrote:

HNY everyone !

I am looking for service manuals for the 5L4N and 7L18 spectrum analyzer plug-ins for
the 5000 and 7000 series scopes respectively. What I need are the final full release
versions of these service manuals. There are free downloads out there that of the
"PRELIMINARY" service manuals of both these units . I have my own scan of the prelim
7L18 and there is a copy of the prelim 5L4N on one of the better known free download
sites. PLEASE DO NOT POINT ME AT THESE ! What I need is a OEM Paper copy of the full
up final release of the manuals. I would like to borrow these to scan with the carrot
of providing a couple of free downloads from our web site as payment for the favor.
In 18 years of doing this I have never lost or damaged a loaner manual so this should
be a low risk proposition. Depending on your current point of view I am fortunately
or unfortunately located in the USA so offers to loan me a manual if you live outside
the USA while appreciated in sentiment are not financially practical.

May the gods of stagnate water smile favorably upon all of you and your offspring in
the year to come

-DC
manuals@artekmanuals.com


Re: 8568b YTO problem

Pete Lancashire
 

How about trying the HP/Agilent group on Yahoo ?

-pete

On Tue, Jan 2, 2018 at 7:00 AM, Bill Riches <bill.riches@verizon.net> wrote:

I have three 8568B SAs. One works fine, the other two have the same
problem.



8568B - 2503A01022.



Test FX = 441.0 Mhz -10db. (freq and cal readout are right on)



Span 1 Mhz ok - no jitter (pic 1mhz)

Span 1.1 Mhz - jitter (pic 1.1 Mhz) (no YTO Icon)

Span 20.0 no jitter

Span 20.1 Jitter and YTO icon. (pic 20.1Mhz)



https://www.dropbox.com/sh/nescko2lr1rymwu/AADlF682G54OGdOdHHDHFnrZa?dl=0



Pictures are on my dropbox - taken with Trace in "Max Hold" to show width
of jitter.



I have the complete set of manuals - Troubleshooting and performance tests.



Any suggestions on what section to start?



Any help would be appreciated!



73,



Bill, WA2DVU





8568b YTO problem

Bill Riches
 

I have three 8568B SAs. One works fine, the other two have the same
problem.



8568B - 2503A01022.



Test FX = 441.0 Mhz -10db. (freq and cal readout are right on)



Span 1 Mhz ok - no jitter (pic 1mhz)

Span 1.1 Mhz - jitter (pic 1.1 Mhz) (no YTO Icon)

Span 20.0 no jitter

Span 20.1 Jitter and YTO icon. (pic 20.1Mhz)



https://www.dropbox.com/sh/nescko2lr1rymwu/AADlF682G54OGdOdHHDHFnrZa?dl=0



Pictures are on my dropbox - taken with Trace in "Max Hold" to show width
of jitter.



I have the complete set of manuals - Troubleshooting and performance tests.



Any suggestions on what section to start?



Any help would be appreciated!



73,



Bill, WA2DVU

40321 - 40340 of 183587