Phaser 4500/4510 Service Manual 2-23
Theory of Operation
Fuser Control
The fuser heater control maintains the fuser at a pre-determined control
temperature by turning the halogen lamp in the heat roller ON and OFF. The
control temperature varies depending on whether or not the printer is at the
Ready state, and whether the main motor is operating.
The fuser temperature is considered abnormal when the detected
temperature exceeds 250° C, or falls below 130° C.
Temperature Control
At the start of warm-up and when the main motor is at rest, the standby
temperature is used as the fuser control temperature. When the main motor is
operating except at warm-up, the running temperature is used as the fuser
control temperature.
The running temperature and print speed depend on the media type selected
for printing. The Phaser 4500 uses four temperature settings while the Phaser
4510 uses six. Print speed slows down for heavy media such as card stock or
envelopes, and specialty media such as transparencies. The following tables
show the default assignments of temperature setting to media type. The
temperature setting assignment for a media type can be changed as
explained in “Adjusting Fuser Temperature” on page 6-8.
Phaser 4500 Fuser Temperature Default Settings
Media Type Name
Extra High
215°
High
210° C
Medium
205° C
Low
185° C
Plain Paper X
Letterhead
X
Transparency
X
Labels
X
Colored Paper
X
Card Stock
X
Envelope
X
Special
X
Phaser 4510 Fuser Temperature Default Settings
Media Type Name
Extra High
187° C
Very High
215° C
High
212° C
Medium
205° C
Low
190° C
Very Low
170° C
Plain Paper X
Transparency
X
Card Stock
X
Envelope
X
Labels
X
Letterhead
X
Preprinted
X
Prepunched
X
Colored Paper
X
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General
Weight and Dimensions
