Main Scanning Synchronous Control

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Main Scanning Synchronous Control
Main scanning synchronous control is operated at synchronous PCB based on BD synchronous signal.
Based on BD signal that is formed from A laser light detected by BD PCB, BD synchronous signal for each laser is formed inside image PCB.
Image data written in the line memory is read out by the readable signal (RE_A, RE_B, RE_C, RE_D) according to the 4 phase differences formed inside the delayPCB based on the BD synchronous signal (BD_SYNCH) and is sent to the laser driver.
Because iR4025 is a 2 beam, the reading possibility signal becomes RE_C and RE_D.
NOTE:
Regarding BD signal formation
Not B laser but A laser only reaches BD sensor on BD PCB. BD signal is formed based on A laser light.
About iR4025 the BD signal is formed based on C laser light.

[1] Synchronous PCB | [4] VDO
[2] Delay PCB | [5] VDO signal process unit
[3] Line memory | [6] Laser driver PCB
BD_SYNCH: BD synchronous signal
RE_A/B/C/D: Readable signal