Xerox WorkCentre PE120-120i-3124 - Manual (Page 178)

Maintenance 8.12
Consumables and Replacement
Parts
From time to time, you needs to replace the toner cartridge,
roller, and fuser unit to maintain top performance and to avoid
print quality problems and paper feed problems resulting from
worn parts.
The following items should be replaced after you have printed
the specified number of pages:
To purchase consumables and replacement parts, contact your
Xerox dealer or the retailer where you bought your machine. We
strongly recommend that these items be installed by a trained
service professional, except for the toner cartridge (see
page 8.8) and the ADF rubber pad (see page 8.13).
Items Yield (Average)
ADF rubber pad Approx. 20,000 feeds
Transfer roller Approx. 60,000 feeds
Fuser unit Approx. 80,000 feeds