Canon FAX L1000 Service Manual page 588

FAX-L1000 Chapter 5: Appendix
b.Image Signal
(1) The image signal (nVDO) is sent from the PDL board to the TWINS board selector
IC.
(2) The image signal (nVDO) from the fax (SCNT board) and the image signal (nVDO)
from the printer (PDL board) are switched by the selector IC.
(3) The nBD and nTOP signals from the ECNT board are separated by the TWINS board
and sent to the SCNT board and the PDL board. However, with facsimile printing, the
signal which would be sent to the PDL board is switched by the selector ICD on the
TWINS board so that it is not sent to the PDL board. With printer printing, it is
switched so that it will be sent.
Ethernet Board
•Control Panel
The PDL board also controls the printer operation buttons. All communication between the
buttons and the PDL board is done via the SCNT board.
PDL Data from PC
nVDO
nBD,nTOP
PDL Board
PDL data from Network
Figure 5-91 Flow of Print Data 2
TWINS Board
TWINS
IC
Select signal
Selector
IC
1
Selector
IC
3 2
nTOP,
nBD
ECNT Board
5-230
nBD,nTOP
System
controller
nVDO
IC
SCNT Board