Fuser Operation - Lexmark OptraTM Service Manual

4026-0XX

Fuser Operation

Fuser Mode
Warm-Up Mode
Standby Mode
Print Cycle
Fuser Control
The thermistor detects the hot roll temperature and sends a
corresponding analog signal to the engine board. The engine board
turns the lamp on or off depending on the analog signal from the
thermistor.
If the thermistor detects a high temperature failure but the fuser lamp
does not turn off, the thermal fuse opens (thermostat on models
4026-06C and 06F) and the engine board turns the fuser lamp off.
3-9
Printer Action
When the printer power is turned on
the fuser lamp turns on until the hot
roll temperature reaches approxi-
mately 172 degrees centigrade.
The hot roll temperature reaches
approximately 156 degrees centi-
grade. If this temperature is main-
tained for three minutes, the printer
switches to low temperature standby
mode and the hot roll is maintained
at 112 degrees centigrade.
The hot roll is maintained at 172
degrees centigrade if the engine
board receives a print command
from the controller board.
Note: The hot roll temperature is
slightly higher on models 06C and
06F during the print cycle.