DSC-F55, DSC-F55E (serv.man2) - Sony Digital Camera Service Manual (repair manual). Page 6

The amount of incident light that is introduced from the lens block enters
the CCD imager through iris.

The CCD imager is driven by the pulses (V1 to V4, H1, H2 and RG).  The
CCD output signal between the camera-through mode and the capture mode
is switched by the timing generator as it is controlled by the CAM/ME-
DIUM Controller.  In the camera-through mode, the CCD imager signal is
sampled to a quarter of the original information and is output.

The output signal from the CCD imager is sampled-and-held by the signals
(XSHP, XSHD) that are supplied from the timing generator.  The sample-
and-hold is performed in order to ensure operation of the A/D converter at
the latter circuit.  When the signal amplitude after sample-and-hold is small,
the signal is amplified by the AGC amplifier.

The digital R. G. B. output data from IC152 enters the CAMERA DSP
where the digital data is converted to Y, CR and CB.

The digital data in the form of Y, CR and CB are written into the SDRAM
with the data format of odd data and even data.
The digital data enters again into the CAMERA DSP where it is converted
to analog color difference signals (Y, CR and CB).

The output Y, CR and CB signals from the CAMERA DSP are converted to
the R, G and B signals in the LCD DRIVE circuit and drive the LCD.