General Information 1-9
4025-XXX
Fusing
After image transfer, the toner image is not permanently fixed to the sheet of paper - it is
still dry power and can be easily rubbed off. The Fuser has two rotating rolls; the Hot Roll
and the Pressure Roll. A Lamp inside each of the Rolls heats the Fuser Rolls to
temperatures in access of 300
°F. Paper passes between the two rolls where the toner
image melts and is pressed into the surface of the paper. Fuser Drive Rolls help move
the paper from the Fuser Rolls to the Exit Rolls. The Fuser Exit Sensor monitors the
sheet of paper leaving the Fuser.
Paper Exit
Rolls in the Offset and Exit Unit drive the sheet of paper out of the printer and into the
Face Down Output Tray or face up into the optional Duplex Module. The Full Stack
Sensor monitors the level of paper in the Face Down Output Tray.
Printer Power
The power supplies in the printer provide the voltages that the printer requires to operate.
The various printer functions require +5VDC, +24VDC, and several high voltage DC and
AC values that are used by xerographics.
The printer AC power cord plugs into a grounded AC wall outlet. The cord carries AC line
voltage to a Ground Fault Interrupter, then on to the Noise Filter PWB. The Noise Filter
smooths the AC voltage and sends it to the Main Power Switch. Switching on the Main
Power Switch applies AC voltage to the AC Driver PWB and to the Low Voltage Power
Supply (LVPS) PWB.
The AC Driver PWB is the interface between printer control (MCU) and the Fuser. Fuser
sensors connected to the AC Driver PWB send Fuser status information to the Driver
PWB, which the PWB routes to the MCU PWB. The MCU processes the information and
sends commands back to the AC Driver PWB to tell the AC Driver whether or not to
switch on the Fuser Heat Lamps.
The Low Voltage Power Supply PWB, or LVPS, converts the 110VAC to regulated
+24VDC and +5VDC voltages. The LVPS sends these voltages to the I/O PWB and to the
MCU PWB. The MCU uses the voltages for internal processing and for printer component
operation. The I/O PWB uses the voltages for printer component operation and also
sends +24VDC to the High Voltage Power Supply PWB.
The High Voltage Power Supply PWB, or HVPS, converts the +24VDC received from
the I/O PWB to the high voltages that are required by the xerographic system of the
printer. The HVPS produces the Charge (CR), Transfer (TR), Developer Bias (DB), and
Detack (DTS) voltages, and sends them on to the EP Cartridge Detack Saw and to the
Bias Transfer Roll (BTR).
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