Functional Configuration; Outline; Basic Sequense; Basic Sequence Of Operation - Canon LBP5050 Series Service Manual

2.1 Functional Configuration

2.1.1 Outline

LBP5050N / LBP5050
The machine may be broadly divided into the following 6 functional blocks: engine control system, laser exposure system, image formation system, pickup/trans-
port/delivery system, fixing system, and externals/auxiliary control system.

2.2 Basic Sequense

2.2.1 Basic Sequence of Operation

LBP5050N / LBP5050
The operational sequence of the printer is controlled by the DC controller in the engine control system.
Table describes periods, durations and operations for each period of a print operation from the printer is turned on until the motors stop rotating.
Period
WAIT
STBY
(Standby)
INTR
(Initial rotation period)
PRINT
LSTR
(Last rotation
period)
Engine control
system
To external device
Duration
From the time the power switch is turned on, the door
is closed or the Sleep mode is released until the
printer gets ready for a print operation
From the end of WAIT or LSTR period until either
the print command is received from the main
controller or the power switch is turned off
From the time the print command is received from
the main controller during STBY period until the
temperature of the fixing unit reaches the targeted
temperature
From the end of INTR period until the last media
completes the fixing operation
From the end of PRINT period until the motors stop
rotating
Laser exposure system
Image formation system
Pickup/transport/delivery system
Fixing system
Externals and control system
F-2-1
T-2-1
Brings the printer to printable condition
The printer performs the following during this period:
- Detects the pressure roller pressurized status
- Detects the presence of each cartridge and unit
- Determines the homeposition of the development unit
- Cleans the ITB
- Completes any required calibration, such as color
misregistration and image stabilization control
Maintains the printer in printable condition The printer performs the following
during this period:
- Enters Sleep mode when the main controller sends a sleep command
- Completes any required calibration, such as color misregistration control and
image stabilization control, when the main controller sends a command
Starts up each high-voltage bias, laser scanner unit and fixing unit for preparing a
print operation
Forms the image on the photosensitive drum based on the video signals from the
main controller, transfers and fuses the toner image to the print media The printer
performs color misregistration control and image stabilization control at a specified
print interval after the printer is turned on
Moves the last printed sheet out of the printer and stops the laser scanner unit
operation and high-voltage biases The printer enters INTR period as soon as the
LSTR period is completed if another print command is received from the main
controller
Operation
Chapter 2
0019-2379
0019-2383
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