Main Scanning Synchronization Control; Timing Of Execution; Details Of The Control - Canon imageRUNNER ADVANCE 8105 Series Service Manual

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Technology > Laser Exposure System > Controls > Laser ON Timing Control

Main Scanning Synchronization Control

This control is performed to adjust the writing position in the main scanning direction.

For every eight lines

1) The synchronization control in horizontal scanning direction is executed with reference to

2) The BD PCB is located on the light path of Laser A laser beam and the laser beam is

emitted to the BD PCB.

3) The BD PCB detects laser beam of Laser A and generates BD signal to be sent to the DC

Controller PCB.

4) The DC Controller sends the PBD signal to Main Controller PCB 2 according to BD signal.

5) Based on the laser phase coefficient and the BD signal, the DC Controller PCB generates

synchronization signal in horizontal scanning direction on an 8 lines basis at the generation

area of synchronization signal in horizontal scanning direction.

6) Once the PBD signal is received, Main Controller PCB 2 sends video signal to the DC

Controller PCB.

7) The video signal sent from Main Controller PCB 2 is output to the Laser Driver PCB

according to the synchronization signal in horizontal scanning direction.

DC Controller PCB

Technology > Laser Exposure System > Controls > Laser ON Timing Control

EEPROM on the Laser Driver PCB stores the 8-beam phase displacement

coefficient (laser phase coefficient), which is unique to the Laser Scanner Unit,

and corrects 8-beam phase difference based on the stored coefficient. When a

Laser Scanner Unit is replaced, the DC Controller PCB automatically retrieves the

laser phase coefficient of EEPROM.

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