Image Sensing (Digital Copier & Copier/Printer Configuration); Xenon Lamp And Drive Circuitry - Xerox DocuColor 12/DCCS50 Service Manual

Image Sensing (Digital Copier & Copier/Printer
Configuration)
The image sensing components are shown in
HALR-RATE
CARRIAGE
CCD LENS
CCD ARRAY
Figure 1 Scanning Optical System Mechanical Components Locations
Principles of Operation
Image Sensing (Digital Copier & Copier/Printer Con-
Figure 2 and Figure 3.
XENON LAMP FULL-RATE
CARRIAGE
CARRIAGE
MOTOR
Figure 2 Motor/Lamp/Fan Drive PWBA Location

Xenon Lamp and Drive Circuitry

A Xenon Lamp (Figure 1) is used in this machine as a means of reducing heat. Unlike incan-
descent Lamps, including quartz Lamps, the illumination of Xenon Lamp is not continuous It
varies directly with the instantaneous voltage of the driving signal. This is similar to fluorescent
bulbs and means that if the driving signal is AC (Alternating Current), the bulb emits no light
when the instantaneous voltage is zero.
If the bulb drive frequency is 60 Hz or higher, the human eye sees this as a constant level of
illumination. However, the CCDs on the CCD PWBA are fast enough to see the change in illu-
mination caused by the AC drive signal used for the Xenon Lamp. Therefore, the CCD must
capture its image when the Xenon Lamp outputs are known to be non-zero.
Two techniques are used to compensate for this:
1/05
10-70
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MOTOR/
LAMP/FAN
DRIVE PWBA
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DocuColor 12/DCCS50