Canon imagerunner C5180 Service Manual page 220

Print request signal
(Start key ON)
Polygon mirror motor
(Y ,M,C,K)
PTOP signal
Y-TOP signal
Laser Y activation
MEMO: Image processing at the main controller PCB (sub RB-A)
This machine switches over the resolution of both the main scanning direction and the sub scanning direction
from 1200 dpi to 600 dpi by converting the image data to 600 dpi while the character interval information
remained as 1200 dpi at the main controller PCB (sub RB-A).
It is resolved by exposing the same data by 2-dot for the main scanning direction, and by exposing the same data
for A & B, and for C & D, of 4 beams for the sub scanning direction with the feeding speed remains.
Image formation
ready timing
PSTBY PINTR
BD/APC control activation
for laser A
BD/APC control activation
for laser B
PRINT
Image equivalent of 1 line
F-8-6
Chapter 8
Image equivalent of 1 line
8-7