presentation and JEOL SEM problems

Hello,

I'm a new member of this group. I work as a Science teacher (Junior
high) in Sweden. We've three JEOL SEM, however only two working at the
moment. Being on a limited budget, essentially zero, I'm trying to
keep the microscopes alive. The SEMs' are: a JEOL T200, T330 (not
working) and a 35C.

Problems
T200: vibrations and image quality. The built in rotary pump transfers
vibrations through the vacuum hose and the floor (remember it's a
school) to the microscope.

J35C: Today I changed the old objective apertures to a new one and
haven't been able to adjust the aperture back to the beam location. I
follow the instruction for beam alignment but with no result.

Thankful for any suggestions

Erik
.