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Although not 100% accurate schematics for the TDS400 series have been posted to the files section of this group as well as TekWiki. They were scanned from "C" and "D" size engineering drawings and then converted mostly to "A" legal size. These were late pre-production drawings and did not contain the power supply (not Tek made). I did not have access to final engineering drawings. No manual was ever published by Tektronix for the TDS400 series which contained schematics or parts layout drawings or pictures. Being the first all digital oscilloscope which relied extensively on microprocessor control, it was new territory. The next series, TDS500, had manuals which were similar to past Tek manuals complete with schematics, theory of operation, and pictures.

I have no background in manual writing or compiling, just a technical background working at Tektronix for about 30 years. I was able to obtain the drawings from one of the engineers who designed the TDS series, now passed on. I tried to post on TekWiki but was not savvy enough to figure out the posting process.

I had sent a couple of the trigger related schematics to Tim Wright who was having triggering issues with his TDS420 in hopes it would help him find his problem. I then posted all my jpg files to the cloud and informed Tim that they were available for him to use. Kurt Rosenfeld at TekWiki has also been informed of the existence of the schematics.

Both Tim and Kurt have assembled my jpg images into a single pdf file. I thank them both for doing something that I had been unable to do which resulted in my work to be available to those who may need it. The TekWiki availability is here:
- or:


The schematics are available in the Group files section here:
/g/TekScopes/files/Tektronix%20TDS420_460%20Schematics.pdf

Best regards,

Ferrous Steinka

Amazing!!
Now what is missed is more schematics for the 500/600/700 series ? but
maybe more importantly it would amazing to find the service software they
use to find the problems. Basically what you would execute if you follow
the board level troubleshooting guide (for example for the tds520). My
knowledge is that there was a software that downloaded coded onto the scope
that would test different part of the system using either the GPU. Or the
console adapter board.
These software, at my knowledge, is lost on time and space.

Also schematics for 700 series scope would be amazing! Another thing would
be the source code of the boot room and software, but I would be already
happy with the service software ?


Il ven 17 gen 2025, 19:36 Ferrous Steinka via groups.io <ferrous.steinka=
[email protected]> ha scritto:

Although not 100% accurate schematics for the TDS400 series have been
posted to the files section of this group as well as TekWiki. They were
scanned from "C" and "D" size engineering drawings and then converted
mostly to "A" legal size. These were late pre-production drawings and did
not contain the power supply (not Tek made). I did not have access to
final engineering drawings. No manual was ever published by Tektronix for
the TDS400 series which contained schematics or parts layout drawings or
pictures. Being the first all digital oscilloscope which relied
extensively on microprocessor control, it was new territory. The next
series, TDS500, had manuals which were similar to past Tek manuals complete
with schematics, theory of operation, and pictures.

I have no background in manual writing or compiling, just a technical
background working at Tektronix for about 30 years. I was able to obtain
the drawings from one of the engineers who designed the TDS series, now
passed on. I tried to post on TekWiki but was not savvy enough to figure
out the posting process.

I had sent a couple of the trigger related schematics to Tim Wright who
was having triggering issues with his TDS420 in hopes it would help him
find his problem. I then posted all my jpg files to the cloud and informed
Tim that they were available for him to use. Kurt Rosenfeld at TekWiki has
also been informed of the existence of the schematics.

Both Tim and Kurt have assembled my jpg images into a single pdf file. I
thank them both for doing something that I had been unable to do which
resulted in my work to be available to those who may need it. The TekWiki
availability is here:
- or:


The schematics are available in the Group files section here:

/g/TekScopes/files/Tektronix%20TDS420_460%20Schematics.pdf

Best regards,

Ferrous Steinka

Hey Ferrous,

This is amazing, it's sure to extend the life of some of those TDS420/460
scopes that otherwise would have been landfill - thanks!

Siggi

On Fri, Jan 17, 2025 at 1:36?PM Ferrous Steinka via groups.io
<ferrous.steinka@...> wrote:

Although not 100% accurate schematics for the TDS400 series have been
posted to the files section of this group as well as TekWiki. They were
scanned from "C" and "D" size engineering drawings and then converted
mostly to "A" legal size. These were late pre-production drawings and did
not contain the power supply (not Tek made). I did not have access to
final engineering drawings. No manual was ever published by Tektronix for
the TDS400 series which contained schematics or parts layout drawings or
pictures. Being the first all digital oscilloscope which relied
extensively on microprocessor control, it was new territory. The next
series, TDS500, had manuals which were similar to past Tek manuals complete
with schematics, theory of operation, and pictures.

I have no background in manual writing or compiling, just a technical
background working at Tektronix for about 30 years. I was able to obtain
the drawings from one of the engineers who designed the TDS series, now
passed on. I tried to post on TekWiki but was not savvy enough to figure
out the posting process.

I had sent a couple of the trigger related schematics to Tim Wright who
was having triggering issues with his TDS420 in hopes it would help him
find his problem. I then posted all my jpg files to the cloud and informed
Tim that they were available for him to use. Kurt Rosenfeld at TekWiki has
also been informed of the existence of the schematics.

Both Tim and Kurt have assembled my jpg images into a single pdf file. I
thank them both for doing something that I had been unable to do which
resulted in my work to be available to those who may need it. The TekWiki
availability is here:
- or:


The schematics are available in the Group files section here:

/g/TekScopes/files/Tektronix%20TDS420_460%20Schematics.pdf

Best regards,

Ferrous Steinka

I should probably mention that the schematics are NOT 100% accurate. What has been published is a scan of the last pre-production drawings. A final production set was never completed because there was never the intent to publish the finalized schematics in the manual. Most of the errors on the schematics are typos in captioning or incompleteness. For example, on several of the drawings there were added hand written information intended to be included in the next revision, Where there is a single line connecting two or more components but signifying a bus, an added slash with a number indication the number of conductors has been added. Other errors are obvious typos, +15VAC or -5VAC for example which are on the Front Panel schematics should be +15VDC and -5VDC respectively. To my knowledge there are no AC voltages present within the instrument other than the "line trigger" signal from the Auxiliary Power Board <A07>. I am not aware of any incorrect IC designations nor module interconnect errors.

Best regards,

Ferrous