Hi!
I would be very, vary careful about whacking old CRT–based Tek and Hewlett–Packard instruments with the palms of your hands, etc., as the internal structures of the CRTs weren't always as robustly made as they needed to be, and it's easy to cause irreparable damage to the deflection–plate structures that would show up as a distorted trace that cannot be straightened of centred correctly!
Begin with the fault–finding flowchart in the manual, concentrating on the +55V and +110V supplies first, as all the remaining supplies are referenced from the +55V!
Next, once you've got the +55V and +110V H.T. lines o.k., check the lower–voltage supplies for the intermediate and earlier stages, then look to see if the CRT heaters are alight – these are lit up from a highly insulated separate winding of the EHT transformer!
Only once you've checked the +55V, +110V and lower–voltage lines and and confirmed ALL are present and correct do you need to worry about the CRT supplies!
(We can advise on these later)
Chris Williams
PS!
If you've not got an original paper manual and have to rely on PDF copies, have a good look through your PDF to make sure you have all the schematic sheets and layouts, there are too many doing the rounds with parts of the Vertical/Trigger or the Horizontal Amplifier diagram sections missing – please let us know if your manual isn't complete!