6. SCANNER CARTRIDGE
6.1 Scanner Cartridge Overview
The scanner cartridge is a replaceable scanner unit that carries a one-line 128 pixel
BASIS. The scanner separates each of the three RGB primary colors of the LED by
scanning the same line three times. The color image is output by 8-bit signals, 256
gradation in each RGB primary color. For a monochrome image, the image is lit with a
green LED and scanned once to output either a 8-bit or 2-bit signal. The maximum
scanning resolution is 360 dpi
×
360 dpi.
The light source LED within the scanner lights up and illuminates the document on the
platen. The light rays hit the image and using an imaging lens the reflected light rays
are converged onto the BASIS. The converged light rays are converted to analog signals
by the BASIS. After the analog signals have been converted to digital signals by the
scanner controller, the scanned image is processed and the image data is sent to the
computer via the printer's Centronics interface.
6.1.1 Block diagram
Part 4: Technical Reference
BJC-50
4-46
MADE
IN
JAP
AN
Signal Contact
Light Emitting Section
Light Receving Section
Figure 4-32 Scanner Cartridge
Scanner Cartridge
Scanner Controller
Printer
Interface Control
+24V dc
+5V dc
BASIS (Image Sensor)
LED (R, G, B)
Image Processing
A/D Converter (10 Bit)
Analog Signal Control
Sensor Control
Scanning Documents
Figure 4-33 Block Diagram
Summary of Contents for BJC-55 Series
Page 1: ...BJC 55 SERVICE MANUAL Canon...
Page 34: ......
Page 50: ......
Page 73: ...Code page 860 Code page 863 2 23 BJC 50 Part 2 Product Specifications...
Page 74: ...Code page 865 Code page 857 Part 2 Product Specifications BJC 50 2 24...
Page 75: ...Code page 855 Code page 852 2 25 BJC 50 Part 2 Product Specifications...
Page 76: ...Code page 864 Code page 869 Part 2 Product Specifications BJC 50 2 26...
Page 78: ......
Page 106: ...Part 3 Operating Instructions BJC 50 3 28 This page intentionally left blank...
Page 108: ......
Page 160: ......
Page 164: ...4 ADJUSTMENT No parts need to be adjusted Part 5 Maintenance BJC 50 5 4...
Page 199: ...7 1 2 Control board Lower section 5 39 BJC 50 Part 5 Maintenance...
Page 200: ...Part 5 Maintenance BJC 50 5 40 This page intentionally left blank...
Page 206: ...PRINTED IN JAPAN IMPRIME AU JAPON CANON INC The printing paper contains 70 waste paper...