Xerox DocuMate 252, Service Manual

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3.2.3 Video circuit:
The video circuit of the scanner includes: 1. CCD driving circuit, 2. CCD signal
processing circuit.
1. CCD Driving Circuit
The CCD driving circuit is used to generate correct signals to the CCD, so that the
CCD may generate the correct image data.
Signals for CCD:
Pin Assignment for CCD cable
Pin
No.
Name Function
1 AG Analog Ground
2 VOR CCD Red Channel Output Signal
3 AG Analog Ground
4 VOG CCD Green Channel Output Signal
5 AG Analog Ground
6 VOB CCD Blue Channel Output Signal
7 AG Analog Ground
8 12VDC CCD Power Supply
9 SH CCD RGB Channel Shift Gate
10 PHI1 CCD Clock Phase
11 DG Digital Ground
12 PHI2 CCD Clock Phase
13 DG Digital Ground
14 RS CCD Reset Gate
15 DG Digital Ground
16 CP Clamp Gate
17 VCC Digital 5V Power Supply
18 SW Changeover Switch (color and
B/W)
3-4