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