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 1-43Pressure-roller pressurization control

FUSER MOTOR CONTROL

Fuser motor

FUSER PRESSURE RELEASE signal

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

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