Page: 27Service Guide OL830Chapter 2 Principles of Operation2.3.04 Fuser UnitThe Fuser Unit is controlled by a thermistor, a comparator, an LSI, and the CPU to keep the heatroller surface temperature within a predetermined range (about 150 degrees Celsius). A thermalfuse within the Fuser Unit prevents abnormal temperature rises in case the thermistor fails.NOTE:The CPU checks for an open circuit in the thermistor at POWER -ON, setting a fuser alarm if thiserror is detected.The CPU also sets a fuser alarm if the proper temperature is not attained within a specified periodof time after POWER-ON.Upon detecting a fuser alarm, the CPU will halt (after printing the current page.)Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA BusinessPartner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
