Panasonic UF-9000 Service Manual page 171

maximum print quality.
Cleaning:
After transfer, residual toner remains on the drum surface, and for next printing, the residual toner reaches
to the development area via charge and exposure. The charge level of the OPC corresponds to the white
background is +900VDC, and the bias voltage of the conductive roller is approx. +350VDC. Therefor the
positively charged residual toner on the OPC drum is attracted and collected to the conductive roller. The
charge level of OPC after exposure is +100VDC. So, the printing area of the OPC is cleaned.
6.3.2.4. Transfer
As the paper is fed between the drum and the transfer roller, a high negative charge is applied to the back
of the paper. The positive toner particles are then attracted from the drum surface to the paper. After
transfer, the paper is separated from the drum surface by the curvature of the drum.
6.3.2.5. Fusing
The paper passes through the fuser rollers and is subjected to heat and pressure. The fusing temperature is
approximately 190°C (374°F), and the pressure is approximately 0.36kg/cm (3.53N/cm). This bonds, or
fuses, the toner into the paper.
6.3.3. Paper Feed
Media Tray
The main motor drives the pickup roller after the pickup solenoid is energized, which engages the pickup
roller clutch and feeds a sheet of paper. The paper is pushed to the paper feed roller, which overdrives the
paper slightly causing a buckle to ensure the paper is aligned with the stationary registration roller.
While triggering the registration sensor notifying the CPU paper is ready to feed. The paper at this point is at
the same position as with manual feed.
Manual Feed
when paper is inserted, it activates the registration sensor. At the predetermined period of time, the CPU
energizes the registration solenoid that allows the registration roller to rotate, feeding paper to the Paper
Path Sensor.
Ver. 1.0
171
UF-9000
DP-180/190
JAN 2004