The first page of the manual generally has the relevant models. If not, you can find a page dedicated to machine configuration.

All machines are marked with models on the fuselage, and most of them are on the front, with Canon, model name LBP, digital model 2900 and other brand names.

If not, you can look at the nameplate near the power cord on the back of the machine, which is marked with voltage and other models, and you can also find the brand and detention model there.