Vertical Scanning Synchronous Control - Canon imageRUNNER ADVANCE C5045 Series Service Manual

2
VDO_Y
BD_YM
VDO_M
DC
Main Controller
Controller (UN1)
VDO_C
BD_CBk
VDO_Bk
Reference DB
VDO_Y
VDO_M
VDO_C
VDO_Bk
2
Laser Scanner Unit 1
Y Laser
Y Laser Driver
PCB
BD Sensor (Y, M)
M Laser Driver M Laser
PCB
Laser Scanner Unit 2
C Laser
C Laser Driver
PCB
BD Sensor (C, Bk)
Bk Laser
Bk Laser Driver
PCB
F-2-54 F-2-54
VDO
VDO
VDO
VDO
F-2-55 F-2-55

Vertical Scanning Synchronous Control

Purpose
This is to align the writing start position in vertical scanning direction.
Execution timing
Per printing
Execution time
500ms
Control detail
1) When DC Controller receives the print instruction, it detects the reference signal.
Based on this signal, it creates the vertical scanning synchronous signal (PVREQ) and
sends to Main Controller.
2) Main Controller is synchronized with PVREQ signal and sends VDO signal to DC Cotnroller.
3) DC Controller creates the laser drive signal based on VDO signal and sends it to the Laser
Scanner Unit. The Laser Scanner Unit conform the image leading edge with the paper
leading edge by emitting the laser in this timing.
1)
PVREQ
Reference
Signal
Print
instruction
DC Controller
Main
(UN1)
Controller2
VDO Laser drive signal
2)
2-32
Laser Laser Laser Laser
3)
F-2-56 F-2-56
2-32