Outline Of Operation; Outline - Canon ColorPASS-Z20e Service Manual

CHAPTER 1 INTRODUCTION

2 Outline of Operation

2.1 Outline

The ColorPASS enables the customer to use a color copier as a printer and scanner. Users
can print to the ColorPASS from networked PCs running Microsoft Windows, from net-
worked Mac OS computers, and from networked UNIX workstations running TCP/IP.
2.2 Operation
The ColorPASS custom-designed boards and system software are responsible for efficient
image processing and printing controls. The main functions of ColorPASS components and
software are described below.
The ColorPASS uses specialized circuit boards, the motherboard and the video board, to
process image data for printing and scanning images.
The motherboard includes a 433MHz CPU chip which controls the image data transfer to
and from the video board and runs the interpreter. The interpreter rasterizes the page de-
scription file and then compresses the image pattern into memory using compression tech-
nology.
The interpreter outputs compressed raster data through the image frame buffer memory to
the ColorPASS video board. The video board decompresses the image data and sends it to
the copier through the copier interface cable. The raster data supplied to the laser in the
copier charges the drum and renders the final image on paper at full copier engine speed.
High-speed DIMMs (dual in-line memory modules) on the motherboard hold the image
data during printing. The ColorPASS is configured with 128MB of memory.
When Fiery Scan™ uses the copier as a scanner, the ColorPASS acquires RGB (red,
green, and blue) image data from the copier, stores it in memory, and transmits it to the
computer that requested the scan.
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COPYRIGHT© 2000 CANON INC. 2000 2000 2000 ColorPASS-Z40e/Z20e REV.0 AUG. 2000