Sequence Of Operations (Laser Exposure System) - Canon 1000 Service Manual

3. OPERATION AND TIMING
B. Sequence of Operations (laser exposure system)
Figure 3-404 shows the sequence of operations for the laser exposure system.
The laser scanner motor starts to rotate as soon as the power switch is turned on and continues to rotate
at a specific speed until the power switch is turned off.
Each semiconductor laser is 00-activated as soon as the Start key is pressed and is PWM-activated in
relation to the image leading edge signal to form a latent image on the drum. The PWM activation period is
given a delay for each color to make up for the distance between drums.
When the PWM activation for a single scan ends, the laser turns fully for BD signal detection; the next
scanning operation starts when the BD signal is generated.
Power switch ON
Laser scanner motor
Image leading edge signal (ITOP)
Y laser
M laser
C laser
Bk laser
BD signal
Bk laser
(*1) if only executed SALT control
3-64
COPYRIGHT © 2001 CANON INC.
Start key ON
CNTR
00 activation
Drum distance
Full activation
Figure 3-404
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
COPY
PWM activation
00 activation
Paper length
1 scan
PWM activation
00 activation
Full activation
00 activation
STBY
LSTR
SALT
*1