Hi Gypsy, The question is too open-ended. It is expected that you would ask it and then list the 'five' basic tests you ran and their results. The 464 S/M itself has a Troubleshooting chapter for you to read & follow ! You should/must get a copy of the 1998 Tek Manual ; Troubleshooting Your Oscilloscope ; Getting Down to Basics, 068-0315-00. It is one of our Bibles. It's 82 pages and mine is maybe 120 pages with copies of data from my various Tek Scopes and annotations, for example, I made my own index for Ch-7 that's 13 lines long to all out subjects and installed 3-ring dividers to them. You will get help from this great Group, if you show up with Facts and test results.! we cannot read your S/M for you.
Jon Batters