Just started at this shop, they run a Ricoh 901s. It's been years since I've calibrated to a printer -- last one was an Epson and they included a cal kit. This big piggie has none. Not calibrating the printer, just the monitor on my station so what I send to it matches better. Leans heavy toward blues and oranges -- well, let's not talk about that.
if you 901 has a efi controller you probably also have an ES 1000 densitometer attached to it and on the controller runs a version of efi "command workstation" here search for the calibrate button and follow the instructions. good luck.