Laser Control Circuit; Outline - Canon CP660 Service Manual

II. LASER CONTROL CIRCUIT
A.

Outline

DC controller PCB
UBLON
DTOP*
DLSYNC*
DPRNT*
D-CPU
VDATIN8*
DCMD* (IC201)
DVDO0~7*
RAM
DVCLK
(IC205)
PCLK
The laser control circuit serves to control the laser mechanism according to the video
signals (DVDO0 through 7*) from the printer board. The GA (IC204) on the DC controller
PCB generates video data signals (VDATO0 through 7) and image mode setting signal
(PWMF1) using video signals from the printer board *
nals (VDATIN8*) coming by way of the D-CPU (IC201).
COPYRIGHT © 1999 CANON INC.
Download free service manual at http://printer1.blogspot.com
BD*
BDATA*, BDATA
LVDS IC
BSAMPLE*, BSAMPLE
(IC209)
PWM IC
(IC208)
LENB*
BD*
G. A.
(IC204)
VDATIN0~7*
BDO*
BD sync IC
(IC206)
Figure 3-201
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 3 LASER EXPOSURE SYSTEM
BD PCB
Laser driver PCB
Receiver IC
(IC1001)
Current/voltage
conversion circuit
+
Reference voltage
1
and the image mode switch sig-
+5V
LD
PD
Switching
circuit
Laser current
setting circuit
Laser drive IC
(IC1002)
C1004
3-3