Specifications

C-15
PagePro25
The seal beneath the sleeve roller acts to discharge the negatively-charged unused-toner on the sleeve roller. The dis-
charged toner is fed back to the toner feed roller for recycling it. Note that, during printing, the seal voltage is the same as
the sleeve roller voltage and discharge is not made. However, before and after printing, the voltage of the seal bias is set
100V higher than that of the sleeve roller to discharge the unused toner for recycling.
Operation of the Toner Empty Sensor:
The toner empty sensor detects the toner-empty status. The sensor is a photo reflector mounted on the printer.
If low toner condition occurs, the light emitted from the LED of the photo reflector passes the window of the toner hopper
and reflected by the mirror. The reflected light reaches the phototransistor of the photo reflector and the phototransistor
turns ON. Thus, the sensor output is “L” when the toner is empty.
In actual fact, detection of the toner empty is a little more complicate. Since toner in the hopper is agitated with the agita-
tor blades, toner empty cannot be detected like the ON/OFF status of a switch.
The rotating mirror/window blade cleans the mirror and window repeatedly. Basically, the CPU on the main board judges
that the toner near empty occurred when a low toner condition has been detected by a certain number of times while the
mirror/window blade has been rotated by a certain number of times. Next, the CPU judges that the toner empty occurred
when thus detected toner near empty has been counted by a certain number of times. If toner empty is detected, printing
becomes impossible.
The transfer roller transfers the toner image on the surface of the PC drum onto the paper. A positive transfer bias is
applied to the transfer roller so that the toner on the surface of the PC drum sticks to the paper.
The paper then passes through the comb electrode(?) and the static electricity remaining on the paper is discharged.
This enables easy separation of the paper form the PC drum.
The separator claw of the imaging cartridge forcibly separates the paper from the PC drum.
5 TRANSFER SECTION
PC Drum
Paper
Transfer Roller
PC Drum
Comb electrode (??)
Transfer bias
Transfer Guide (??)
Transfer Roller