This article explains how the lamp of a microscope is exchanged. It may not apply to all microscope types.
What are some of the things to look out for when cleaning the microscope? What solvents should or should not be used? This article gives an overview.
What are some of the features to look out for when purchasing a new set of biological microscopes?
This article gives you an overview of different types of microscope objectives, but I must note that a particular objective can fall into several categories at the same time. For educational work, parfocal, achromatic, bright field objectives are very common.
Course work can be quite tough on the devices and a regular functionality check prolongs the life of the instrument.