HP LaserJet 1010 Service Manual - Page 56

Printer paper feed system, Developing stage, Transfer stage, Separation stage, Fusing stage

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3. Developing stage-During this process, the latent electrostatic image is present on the drum. The toner particles obtain a negative surface charge by rubbing against the developing cylinder, which is connected to a negative DC supply. The negatively charged toner is attracted to the discharged (exposed, grounded) areas of the drum, and it is repelled from the negatively charged (unexposed) areas. 4. Transfer stage-During this process, the toner image on the drum surface is transferred to the media. The transfer roller applies a positive charge to the back of the media, which attracts the negatively charged toner on the drum surface to the media. After separation, the drum is cleaned and conditioned for the next image. 5. Separation stage-During this process, the media separates from the drum. To stabilize the feed system and prevent toner dropouts on the printed image at low temperature and humidity, the static eliminator reduces the charge on the back of the media. 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. Printer paper feed system The main input tray and the priority input tray merge into one main input area. The printer senses the paper as it enters the paper feed path via the top of page sensor (PS801). It does not sense the presence of media prior to beginning the print cycle. The following steps occur when the product receives a print job: Step 1 Step 2 Step 3 Step 4 Step 5 The ECU activates the motor (M1). Paper motion begins when the ECU energizes the pick-up solenoid (SL1). The paper pickup roller rotates once. The paper lift plate pushes the media against the pickup roller. 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. 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. 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. 44 Chapter 4 Operational overview ENWW

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3.
Developing stage
—During this process, the latent electrostatic image is present on the
drum. The toner particles obtain a negative surface charge by rubbing against the
developing cylinder, which is connected to a negative DC supply. The negatively charged
toner is attracted to the discharged (exposed, grounded) areas of the drum, and it is
repelled from the negatively charged (unexposed) areas.
4.
Transfer stage
—During this process, the toner image on the drum surface is transferred
to the media. The transfer roller applies a positive charge to the back of the media, which
attracts the negatively charged toner on the drum surface to the media. After separation,
the drum is cleaned and conditioned for the next image.
5.
Separation stage
—During this process, the media separates from the drum. To stabilize
the feed system and prevent toner dropouts on the printed image at low temperature and
humidity, the static eliminator reduces the charge on the back of the media.
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.
Printer paper feed system
The main input tray and the priority input tray merge into one main input area. The printer
senses the paper as it enters the paper feed path via the top of page sensor (PS801). It does
not sense the presence of media prior to 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 pick-up
solenoid (SL1).
Step 2
The paper pickup roller rotates once. The paper
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.
44
Chapter 4
Operational overview
ENWW