Fusing And Exiting; Figure 5-11 Fusing The Toner To The Paper - Tektronix Phaser 550 Service Manual

5
Theory of Operation

Fusing and exiting

Figure 5-11 Fusing the toner to the paper

5-14 Phaser 550 Color Printer
As the paper receives the toner it passes through the fuser. A heated roller on
the top surface of the paper melts the toner on the paper. Sandwiched between a
pressure roller underneath and the heated roller on top, the melted toner bonds
into the paper. An oil supply keeps the heated roller lubricated so that the
melted toner does not adhere to the roller. Following fusing, the paper advances
to the output tray. When not printing, the heated roller is held at a temperature
o
of 160 C. The heater roller is set to 165
o
printing, and 145 C for 1200 dpi printing. The fuser exit sensor detects the sheet
of paper as it leaves the fuser.
Depending on printer driver instructions, the paper may go directly to the
output tray, printed side up. Or, if instructed, the sheet of paper may be routed
to the reverser, which drives the sheet up a narrow channel and then reverses
direction, and routes the sheet of paper to the output tray upside down. This is
appropriate for a collated series of prints that need to remain in first-to-last
order. The paper exit sensor detect the sheet of paper as it enters the exit rollers.
o
C for 600 dpi and transparency film
Reverser
The reverser allows
the prints to exit to
the exit tray printed
side down
Using heat and
pressure, the fuser
bonds the toner to
Reverser
the paper
rollers
Fuser unit
Oil
Heated
roller
roller
Oil
Output tray
full sensor
Fuser entrance
Paper exit
sensor
sensor
Pressure
roller
Output
tray
9013-20