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Pressure-roller pressurization control
To prevent excessive wear on the pressure roller and help with jam-clearing procedures, the pressure
roller pressurizes only during printing and standby. The DC controller reverses the fuser motor. The
fuser motor rotates the fuser pressure-release cam.
Figure 1-43 Pressure-roller pressurization control
Fuser motor
FUSER PRESSURE RELEASE signal
FUSER MOTOR CONTROL
Fuser pressure release cam
Fuser sleeve
The pressure roller depressurizes under the following conditions:
●
The product is turned off with the on/off switch
●
Any failure occurs other than a fuser pressure-release mechanism failure
●
During powersave mode
●
When a paper jam is detected
If the DC controller does not sense the fuser pressure-release sensor for a specified period after it
reverses the fuser motor, it notifies the formatter that a fuser pressure-release mechanism failure has
occurred.
NOTE: The fuser remains pressurized if the power is interrupted when the power cord is removed or
the surge protector is turned off, or if the fuser is removed without turning off the product.
54 Chapter 1 Theory of operation ENWW