6. Fusing stage—During this process, the heat and pressure fuse the toner into the media to produce
a permanent image. The media passes between a heated fusing element and a soft pressure roller,
which melt the toner and press it into the media.
7. Drum-cleaning stage—During this process, the cleaning blade is in contact with the surface of
the drum at all times. As the drum rotates during printing, the cleaning blade wipes excess toner
off the drum and stores it in the waste toner receptacle.
Print cartridge
As the focal point of the image-formation system, the print cartridge contains toner and houses the
cleaning, conditioning, and developing stages of the process. The print cartridge contains the
photosensitive drum, primary charging roller, developing station, toner cavity, and cleaning station. By
including these components (which wear, degrade, or are consumed) in the replaceable print cartridge,
the need for many service calls is eliminated. The special photosensitive properties of the drum form
an image on the drum surface and then transfer the image to media.
CAUTION: The print cartridge does not include a light-blocking shutter. Do not expose the drum to
light, which can permanently damage the drum. Protect the print cartridge whenever you remove it by
covering it with paper.
Product base paper-feed system
The main input tray and the priority input tray merge into one main input area. The product uses the top-
of-page sensor (PS801) to senses the paper as it enters the paper-feed path. It does not sense the
presence of media before beginning the print cycle. The following steps occur when the product receives
a print job.
Step 1 The ECU activates the motor (M1). Paper motion begins when the ECU energizes the pickup solenoid
(SL1).
Step 2 The pickup roller rotates once. The-lift plate pushes the media against the pickup roller.
Step 3 The friction of the pickup 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 holds the remainder of the stack in place.
Step 4 The feed-assembly drive rollers advance the media to the top-of-page sensor (PS801). This sensor
informs the ECU of the exact location of the leading edge of media, so that the image being written on the
photosensitive drum can be precisely positioned on the page.
Step 5 The feed assembly drive rollers then advance the media to the transfer area where the toner image on
the photosensitive drum is transferred to the media.
ENWW Product base functions 49
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