I have a 54645D that has an intermittent problem where all the traces freeze or not appear (both analog and digital) about 10 seconds after cold boot or immediately after warm boot. Sometimes I can capture a waveform and that is fine but normally the traces just freeze after a few seconds. Since Keysight no longer supports this scope I am looking for a schematic to help track the problem down.
Hello don.r,
Unfortunately, we can't give out schematics of our equipment, even if the product is obsolete.
What you can do is take a look at the service guide which will have instructions on troubleshooting as well as replacing parts.
54645A/D User and Service Guide (Nov98) | Keysight (formerly Agilent’s Electronic Measurement)
Even though the product is obsolete, you can still purchase extended support for the 54645D. Options for extended service period calibration and repair are available at the following link.
https://service.keysight.com/infoline/public/product-service.aspx?laf=mya&pn=54645D&lc=eng&cc=US