Learn Spanish (Latin America): Verificar el funcionamiento del telar.

This is an example of the "independent infinitive" used for impersonal instructions. You will frequently see this in manuals, recipes, or on signs (like No fumar). It acts as a general command addressed to anyone reading it, rather than a direct command pointing at a specific person.

Instead of using the noun funcionamiento, could I use a verb phrase like cómo funciona?

Absolutely. Verificar cómo funciona el telar (Verify how the loom works) is a perfectly natural alternative. However, written instructions and technical manuals in Spanish often prefer formal nouns like funcionamiento (operation or functioning) to keep the text concise and highly professional.

Could I use verbs like revisar or comprobar instead of verificar here?

Yes, they are very close synonyms in this context. Verificar and comprobar both mean to verify or prove that something is correct or working properly. Revisar means to inspect or look over. In a technical manual, all three are completely natural for instructing someone to check a machine.

What exactly is a telar?

A telar is a loom, which is a machine used to weave cloth. While it might not be a word you use every day, encountering specialized technical or industrial vocabulary like this is a great way to practice reading real-world manuals at the B2 level.