3: Operation
Colorwriter LSR 2000 Printer
Service Guide
3-3
Overall control system
The operation sequence for the Colorwriter is controlled by the
video controller PCB, terminal PCB, DC controller PCB and the
mechanical controller PCB. When the printer is turned on and
enters the STANDBY state, the microcomputer on the DC
controller sends signals to drive the laser diode, fixing heaters, and
other components in response to the print signal from the video
controller.
The video controller board receives the data to be printed from a
networked device over AppleTalk
, TCP/IP, Novell
networks, or
through the parallel (Centronics
) port. The video controller board
includes a MIPS R4600 RISC (Reduced Instruction Set Computer)
CPU with a built-in floating point accelerator that runs the CPSI
(Configurable PostScript Interpreter). The CPSI (an
implementation of Adobe’s PostScript language) interprets the
PostScript page description file to produce the image pattern in
memory. The Fiery RipChips
on the video controller board
control data management and other system functions, freeing up
the CPU for efficient image data processing. The video interface
chips on the video controller board then transfer the image data to
the DC controller and the mechanical controller to begin the
printing process.
These boards control the engines that perform the printing process.
The microcomputer on the DC controller sends the print sequence
command to the mechanical controller and the mechanical
controller outputs the signals for driving the various loads including
the high-voltage power supply, motors, and solenoids.
