Canon Laser Shot LBP-5100, Service Manual

Page: 35 / 162

Chapter 2
2-1
2.1 Functional Configuration
2.1.1 Outline
0010-6039
LBP5000 / LBP5100
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.
F-2-1
2.2 Basic Sequense
2.2.1 Basic Sequence of Operation
0010-5933
LBP5000 / LBP5100
The machine's sequence of operation is controlled by the CPU on its DC controller PCB. The following describes the machine's operation in respect of various
intervals, from when the machine goes on until its main motor stops at the end of a print job:
T-2-1
2.2.2 Power-On Sequence
0010-6042
LBP5000 / LBP5100
In power-on sequence, the machine resets itself to make sure that it is free of jams and faults. The machine goes through the following from when the power is
turned on until it enters a standby state:
1) The power is turned on.
2) The CPU is initialized.
3) The ASIC is initialized.
4) The video interface communication is started.
5) Residual paper check by each sensor signaling paper presence.
6) Initial drive for main motor, pick-up motor, and fixing/delivery motor
7) Fixing heater initial drive by controlling fixing temperature targeting for 100 deg C.
8) Initial drive for scanner motor
9) Failure/Abnormality check
Detect scanner failure, fixing unit failure, and door open during the above periods.
10) Communication with memory tag
11) Cartridge presence detection
Interval Description Remarks
WAIT
(wait) From when the power is turned on until the initial drive of
the main motor stops. To eliminate the drum surface potential,
and to clean the ETB. The machine checks the presence/
absence of cartridges during the
interval.
STBY
(standby) From when the wait period ends, or when last rotation
ends, to when the video controller sends the print
command; or, from when last rotation ends to when the
power is turned off. To make the machine ready for printing.
INTR
(initial rotation) From when the video controller sends the print command
to when the pickup solenoid goes on. To stabilize the sensitivity of the
photosensitive drum in preparation for a
print job.
PRINT
(print) From when initial rotation ends to when the developing
high voltage goes off. Forms a toner image on the
photosensitive drum and transfers the
image to print paper according to the
video signal from the video controller.
LSTR
(last rotation) From when developing high voltage goes on to when the
main motor stops. To completely discharge the last print
sheet. Also, to clean the ETB. The machine starts initial rotation
immediately in response to the
print command for the video
controller.
To external device
Engine control
system
Laser exposure system
Pickup/transport/delivery system
Image formation system
Fixing system
Externals and control system