EN Paper feed system 63
Paper feed system
Both the Paper Input Tray and the Single Sheet Input Slot merge into one, main input area. Paper
placed in either of these areas enables the Paper Out Sensor (sensor 202), which informs the DC
Controller that paper is present.
When the printer receives a print job and is ready to print, the DC Controller enables the Laser/
Scanner Assembly and the Motor. Paper motion begins when the DC Controller energizes solenoid
SL1. This causes the paper pick up roller to rotate once. Two actions occur as a result of this rotation.
First, the paper kick plate pushes the paper against the pick-up roller. Second, the pick-up roller
grabs the top sheet and advances it to the Feed Assembly drive rollers. To ensure that only one
sheet is fed, a main separation pad, along with two subpads, hold the remainder of the stack in place.
The feed assembly drive rollers advance the paper to the Paper Registration photosensor (PS203).
This sensor informs the DC Controller of the exact location of the paper’s leading edge, so that the
image being written on the photosensitive drum can be precisely positioned on the page. The feed
assembly drive rollers then advance the paper to the transfer area where the toner image on the
photosensitive drum is transferred to paper.
After the image is transferred, the paper enters the fusing assembly where heat from the fuser and
pressure from the Pressure Roller permanently bond the toner image to paper. The Paper Exit
Sensor (PS201) determines that paper has successfully moved out of the fusing area. The fusing
assembly exit rollers deliver paper to either the Output Paper Bin or the Front Output slot, depending
upon the position of the Face-up/Face-down lever.
Figure 5-5 shows a simplified paper path and the locations of the photosensors and rollers.
Figure 5-5 Simplified paper path
Manual Input Slot
Paper Output Bin
Toner Cartridge
Delivery Roller #1
Front Output Slot
Paper
Input
Bin
Paper Out Sensor
(PS202)
Paper Exit
Sensor
(PS201)
Heating Element
Pick-up Roller
Pressure Roller Transfer Roller
Paper Registration
Sensor
(PS203)
Main Motor
Service.book Page 63 Thursday, September 14, 2000 11:15 AM
