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(ii) CCD block
The CCD block is composed of the lens part and CCD part integrated together. One flexible board is connected each for
the CCD part and lens part.
• CCD part
The CCD is driven by the 15V and –7.5V voltages output from the DD board, and converts the input light into the
electrical signal.
Data is output from the CCDOUT terminal according to the horizontal sync clock (H1, H2) and the vertical sync clock
(V1, V2, V3, VSUB) input from the timing generator.
The output of the CCDOUT terminal can be checked on the oscilloscope.
• Lens part
The lens part sets the iris, etc.
The power for the lens block is supplied from the iris control section via the iris flexible board.
The power for the lens block is supplied from the iris control section via the iris flexible board.
(Repair Tips) Checking iris operations
Iris open/close operation can be checked visually by increasing or decreasing the brightness of the lens block in the auto
camera mode.
The screen will become totally black when the flexible board of the lens block is cut or the iris remains closed due to the
faulty contact of the connector.
(iii) Image data processor (1)
The image data input from the CCD block is sample-held (S/H), and converted to digital signal by the A/D converter.
• S/H, AGC (IC404)
For the analog output signal from the CCD block, the light amount is output as the differential voltage. This differential
voltage is output by sample-holding inside IC404.
The differential voltage is level-adjusted by the AGC (auto gain control) circuit, and output from the DRVOUT terminal
(Pin 8 of IC404).
This output waveform becomes a stepped rectangular wave since it is sample-held.
Fig. 7 CCDOUT Waveform and DRVOUT Waveform
• A/D converter (IC405)
Sample-held signals are A/D converted by IC405, and the RGB signals of one pixel are each output as 10 bit digital data
(D0 to D9).
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