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DETAILED SECTION DESCRIPTIONS
PCBs AND THEIR FUNCTIONS
2.5. PCBs AND THEIR FUNCTIONS
2.5.1. SBU (Sensor Board Unit)
Sample
hold
CCD
Sample
hold
The light reflected from the document is picked up by the CCD (Charge
Coupled Device) and converted into an electrical signal. The CCD sends both
odd and even pixel video signals to the multiplexer, where these signals are
merged. The signal is amplified and digitized then sent to the SCU.
Gain
Multiplexer
control
Relative
Absolute
2-20
October 9th, 1995
SCU
A/D
converter
Ref.
White level
selection
G404D505.wmf
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