Canon imageRUNNER ADVANCE C5051 Series Service Manual page 75

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Technology■>■Laser■Exposure■System■>■Various■Controls■>■Laser■shutter■control
■ Laser■shutter■control ■
● Purpose
■
This■is■to■prevent■the■residue■toner■from■sticking■to■the■dust-prevention■glass.■Or■to■prevent■
the■laser■light■from■emitting■to■the■machine■inside■when■the■front■cover■/■right■cover■is■opened.
● Execution timing
■
After■power-ON
● Execution time ■
Approx.■3s■(at■power-ON),■approx.■1s■(when■scanner■motor■is■started■or■cover■is■opened)
● Control detail ■
While■the■Laser■Scanner■Motor■is■operating,■the■Laser■Shutter■is■opened.■During■other■period,■
the■laser■shutter■is■closed.
Also,■the■Front■Cover■Sensor■(PS18)■or■the■Right■Cover■Sensor■(PS20)■works■together■and■
it■stops■the■output■signal■of■laser■driver.■At■the■same■time,■if■the■Front■Cover■or■Right■Cover■is■
opened,■the■Shutter■is■closed■and■the■laser■light■path■is■forcibly■blocked.
Those■operations■are■controlled■by■the■DC■Controller.
2 Technology■>■Laser■Exposure■System■>■Various■Controls■>■Laser■shutter■control
Bk Laser Shutter
Bk Shutter Lever
Color
Shutter Lever
Bk Shutter Cam
Drive Shaft
Color Shutter Cam
Laser Shutter Sensor (PS29)
Sensor Lever
DC Controller (UN1)
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Color Laser Shutter
Laser Shutter Motor (M28)
Front Cover Sensor (PS26)
Right Cover Sensor (PS26)
F-2-57
2-39