Canon GP335 Service Manual page 118

CHAPTER 5 LASER EXPOSURE SYSTEM
The flow of signals is as shown in Figure 5201. The image processor PCB generates clock
signals for synchronized control using the BD signal. The image signals from the CCD is written to
the memory for horizontal synchronization, and the image signals are read in conjunction with the
clock signals for transfer to the laser driver PCB.
BD detection PCB
BD signal
J708
Image signal
J301
CCD PCB
J706
Related Service Mode
E100
5-4
Clock signal generation for
horizontal synchronization
Memory for horizontal
synchronization
(main scanning direction)
8
Figure 5-201
• The BD signal is not detected within 2 sec after the laser beam is turned on.
(laser emission start signal)
• The synchronization of the BD signal has an irregularity.
COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Image processor PCB
Laser driver PCB
PBD
J717B
J500B
J500A
Image signal
8
J717A