Ricoh AC205 Service Manual - Page 159

SCANNING UNIT, LASER SCANNING UNIT (LSU), CCD Module Specifications

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SYSTEM LAYOUT 6.2.5 SCANNING UNIT The image is read using a photosensitive sensor. The scanning unit consists of the following: • CCD module • Connection board • ADF board • AFE (Analog Front End) • Image Processor (located in CPU) • Platen glass and ADF mechanism CCD Module Specifications: • Resolution: 600dpi/A4 • Maximum scan width: 8.5" • Color filter: Red, Green, Blue • Output channel: 3 channels (R, G, B) • Effective pixel: 5,400 pixels • Voltage: 24V & 5V • Pre-heating time: Maximum 30 seconds (70% of light output reached) • Life span of the lamp: 30,000 hours (25° C) 6.2.6 LASER SCANNING UNIT (LSU) The laser-scanning unit converts video data received from machine control into an electrostatic latent image on the surface of the OPC drum. This is achieved by controlling the laser beam and exposing the surface of the OPC drum to the laser light. The polygon mirror reflects the laser light onto the OPC. Each side of the mirror is one scan line. The OPC drum turns as the paper feeds, to scan the image down the page. Detailed Descriptions SM 6-5 B273

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SYSTEM LAYOUT
SM
6-5
B273
Detailed
Descriptions
6.2.5 SCANNING UNIT
The image is read using a photosensitive sensor. The scanning unit consists of the
following:
•
CCD module
•
Connection board
•
ADF board
•
AFE (Analog Front End)
•
Image Processor (located in CPU)
•
Platen glass and ADF mechanism
CCD Module Specifications:
•
Resolution: 600dpi/A4
•
Maximum scan width: 8.5”
•
Color filter: Red, Green, Blue
•
Output channel: 3 channels (R, G, B)
•
Effective pixel: 5,400 pixels
•
Voltage: 24V & 5V
•
Pre-heating time: Maximum 30 seconds (70% of light output reached)
•
Life span of the lamp: 30,000 hours (25
°
C)
6.2.6 LASER SCANNING UNIT (LSU)
The laser-scanning unit converts video data received from machine control into an
electrostatic latent image on the surface of the OPC drum. This is achieved by
controlling the laser beam and exposing the surface of the OPC drum to the laser
light.
The polygon mirror reflects the laser light onto the OPC. Each side of the mirror is
one scan line. The OPC drum turns as the paper feeds, to scan the image down
the page.