Xerox Phaser 8560MFP Service Documentation page 290

The latching mechanism is actuated by a small movement of the wiper coupled with the Head
Tilt Solenoid. The action of the solenoid ensures that the head-tilt gear engages the tilt drive
gear. Through a follower gear, the compound gear drives the tilt cam gear clockwise. A cam fol-
lower, mounted on the lower end of the tilt arm, follows the rotating tilt cam gear and tilts the
Printhead. After one revolution of the tilt gear, the latching mechanism is pulled back into posi-
tion by the Head Tilt Solenoid.
As viewed from the left side of the system, when the arrows do not align, the tilt gear is
engaged.
Figure 15 Printhead Tilt Detail
To accommodate Printhead maintenance, the Printhead can be tilted back away from the
drum. This creates room for the wiper to be moved into position in front of the Printhead face-
plate. The process drive drives the gears to the tilt compound gear train. The drum mainte-
nance camshaft drives the gear train to tilt the Printhead.
Drum Assembly
The drum assembly and transfix system form the key portion of the system where imaging
takes place. The drum assembly and transfix system are separate, but interrelated. This sec-
tion discusses the drum assembly. The next section goes into more detail on the transfix sys-
tem.
Theory of Operation
Image Output Terminal
In operation, the image to be printed on paper is first "printed" on the rapidly rotating drum. The
paper Preheater heats a sheet of paper or transparency film to prepare it for the image transfer
process. The heated paper is then passed between the drum (now rotating much more slowly)
and the transfix roller. Under the pressure between the drum and the transfix roller, the image
is transferred to the sheet of paper. An encoder disk and sensor on the left end of the drum
monitors the drum's speed and position.
The drum heater heats the surface of the drum to about 60° C (140° F) for imaging. The drum
heater does not rotate. The heater is inside the drum, and is controlled by the drum heater
relay board. The drum heater consists of two resistive heater coils that operate in series for 220
V and in parallel for 110 V operation. The series/parallel operation is controlled by the drum
heater relay board. A temperature sensor in contact with the drum surface monitors the drum
temperature. The main board interprets the sensor's signal and turns on the drum heater and
drum fan to heat the drum, or turns on the drum fan alone to cool the drum.
The drum is driven by a closed-loop servo motor. Through a single reduction belt drive, the
servo motor rotates the drum at a high speed for imaging and a constant low speed for image
transfer to paper. The Y-Axis uses an active tension system to allow the pulley to float while the
spring actively adjusts the tension.
10/2006
8-18
Figure 16 Drum Assembly
Phaser 8510/8560MFP Multifunction Product
Initial Issue