HP 6033A Service Manual
Also covers the HP 6038A
This is a 113 page printed manual with 4 pages of 11" X 17" foldout schematics, layouts, and diagrams
HP P/N 05959-3346
This manual is for units with SN prefix:
US38320231 & above (HP 6033A)
US38310401 & above (HP 6038A)