Canon IMAGERUNNER ADVANCE C5030, Руководство по обслуживанию, Страница: 69 / 1455

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Technology■>■Laser■Exposure■System■>■Various■Controls■>■Horizontal■scanning■synchronous■control
Technology■>■Laser■Exposure■System■>■Various■Controls■>■Horizontal■scanning■synchronous■control
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Laser■ON■/■OFF■control
■ ● Purpose
Laser■light■is■turned■ON■/■OFF■according■to■the■combination■of■laser■control■signals.
■ ● Execution timing
After■the■power■ON
■ ● Control detail
DC■Controller■switches■the■4■modes■(forcible■OFF■mode,■APC■mode,■Print■mode■and■standby■
mode)■according■to■the■laser■control■signal.
DC Controller (UN1)
Laser control signal
Video signal
Laser Driver
PCB
Laser beam
Scanner mirror
Mode Laser■status Remark
Forcible■OFF■mode OFF Light■intensity■setting■decided■on■APC■is■cleared.
APC■mode ON Laser■light■intensity■adjustment
Print■mode ON■/■OFF Laser■is■emitted■according■to■the■video■signal.
Standby■mode OFF Host■machine■is■in■standby■status.
Print
instruction
Image formation
ready timing
At 1st line (APC)
At 2nd line (APC)
At 3rd line (APC)
At 4th line (APC)
Mode
name
Standby
mode
Standby
mode
APC mode APC mode / Print mode
Forcible
OFF mode
LaserD
LaserC
LaserB
LaserA
PSTBY PSTBY PINTR PRINT LSTR
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F-2-48
T-2-24
F-2-49
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Horizontal■scanning■synchronous■control
■ ● Purpose
This■is■to■align■the■writing■start■position■in■horizontal■scanning■direction.
■ ● Execution timing
Per■1■line
■ ● Execution time
Approx.■7.5µs
■ ● Control detail
1)■DC■Controller■forcibly■emits■the■laser■diode■on■M-laser■driver■PCB■by■setting■the■laser■
control■signal■of■M■-laser■to■APC■mode.■Also,■DC■controller■forcibly■emits■the■laser■diode■of■
Bk■laser■driver■PCB■by■setting■the■Bk■laser■control■signal■to■APC■mode.
2)■Concerning■the■laser■beam■of■M■laser,■there■is■a■BD■sensor■(Y,■M)■on■the■scanning■light■
path■and■the■laser■bean■is■emitted■to■the■BD■sensor■(Y,■M).■Regarding■the■laser■beam■of■Bk■
laser,■there■is■a■BD■sensor■(C,■Bk)■on■the■scanning■light■path■and■the■laser■beam■is■emitted■
to■the■BD■sensor■(C,■Bk)■as■well.
3)■Two■BD■sensors■detect■the■laser■beam,■create■the■BD■signal■(BD_YM,■BD_CBk)■and■send■
it■to■the■DC■controller.
4)■DC■Controller■executes■synchronous■control■based■on■this■signal■and■sends■the■standard■
BD■signal■to■Main■Controller■as■a■horizontal■scanning■synchronous■signal■(BD)■per■1■line.
5)■When■Main■Controller■receives■those■signals,■it■outputs■the■video■signal■(VDO_Y,■VDO_
M,■VOD_C,■VDO_Bk)■to■DC■Controller.■As■a■result■of■this,■the■Laser■Driver■emits■the■laser■
beam■from■the■specified■position■for■each■line.