What is the expected lifespan of the maintenance parts such as the fuser unit, transfer roller, and pick-up roller?

The fuser unit, transfer roller, pick-up roller, and feed roller all have a rated life of 30,000 pages. The fuser unit part codes are JC91-01077A for 220V models and JC91-01076A for 110V models. The overall printer set life cycle is also rated at 30,000 sheets or 5 years, whichever comes first.