Panasonic Workio DP-C305, Service Manual

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609
DP-C405/C305/C265
FEB 2008 Ver. 1.1
Once all four layers of toner reside up on the Intermediate Transfer Belt, the registration roller clutch is
energized to advance a sheet of paper (which has already been picked) to the second bias transfer
roller. The toner image on the rotating Intermediate Transfer Belt, and the paper that is being fed into
the image unit are synchronized for proper alignment. The leading edge of toner image on the
Intermediate Transfer Belt is aligned 4 mm from the leading edge of the paper. A strong negative
voltage in the bias roller pushes out the toner from the Intermediate Transfer Belt onto the paper. The
bias roller voltage is approximately -1500 volts. This voltage varies depending on the ambient
temperature, humidity, print speed, and media being printed upon. The paper (or transparency film)
advances at the same speed as the Intermediate Transfer Belt.
The Intermediate Transfer Belt Blade scrapes any remaining traces of toner from the Intermediate
Transfer Belt prior to the next image transfer. The scraped toner is discharged to the Toner Waste
Container by the spiral paddle shaft.
6.4.7. Induction Heating (IH) Fusing System Operation
After the toner image has been applied to the paper, it passes through the Fuser Unit.
When the Heater Belt Motor starts to rotate, the Induction Heating (IH) Coil is turned on, heating the Heat
Roller. As a result, the Heater Belt, contacted with the Heat Roller surface, is heated by the Heat Roller. A
heated Heater Belt melts the toner and the pressure of the Pressure Roller fuses it into the paper. The
melted toner bonds to the paper. After fusing, the paper advances to the output tray. When the printer is
idle, the IH coil is turned off and the Heater Belt is not heated. This Heater Belt temperature varies with the
selected settings of 600 or 1200 dpi printing mode, thick paper printing mode, transparency printing mode,
etc. The Fuser Unit has the Paper Entrance Sensor and Paper Exit Sensor, which are used for determining
the Control timings of the paper feeding by detecting the paper entrance, exit and Jam.
Pressure Roller
Paper Exit Sensor
Paper Entrance Sensor
Induction Heating (IH) Coil
Heat Roller
Thermistor
Heater Belt
Fuser Roller
Intermediate Transfer Belt
Second Bias Transfer Roller (STR)