Canon imageRUNNER ADVANCE 6055 Series, Service Manual

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Technology > Laser Exposure System > Controls > Laser Shutter Control
Technology > Laser Exposure System > Controls > Laser Shutter Control
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Polygon Motor Control
This control is performed to rotate the polygon mirror at a specified speed.
<Execution timing>
When the Polygon Motor is started
<Control description>
1) The DC Controller PCB outputs acceleration signal (ACC) to forcibly rotate the Polygon
Motor.
2) The speed detection signals (FG, BD) are detected to be compared with the reference
signal generated in the reference signal generation area, so that the acceleration signal
(ACC) and the deceleration signal (DEC) are controlled to keep the specified speed.
Polygon motor
BD PCB
BD DEC ACC
DC Controller PCB
Related Error Code
E100: Failure to detect PLOCK signal during BD rotation
E110: Failure to detect VLOCK signal during FG rotation
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Laser Shutter Control
To prevent laser exposure in the machine when the Cover is open
<Execution timing>
When the Front Door or Multi tray Cover opens/closes
<Control description>
When the Front Door or Multi tray Cover opens, the DC Controller PCB stops power supply
(DC5V) of the Laser Driver to prevent laser exposure.
Relay PCB
DC Controller PCB
Front Door Open Detection Switch
SW2
Multi-purpose Cover Open/Close Sensor
PS3
DC Power Supply PCB
DC12V
DC5V
DC/DC
NOTE:
This control is executed by the software only and there is no shutter to prevent
laser exposure.
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