Video Circuit - Xerox DocuMate 252 Service Manual

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
1 AG
2 VOR CCD Red Channel Output Signal
3 AG
4 VOG CCD Green Channel Output Signal
5 AG
6 VOB CCD Blue Channel Output Signal
7 AG
8 12VDC
9 SH
10 PHI1
11 DG
12 PHI2
13 DG
14 RS
15 DG
16 CP
17 VCC
18 SW
Function
Analog Ground
Analog Ground
Analog Ground
Analog Ground
CCD Power Supply
CCD RGB Channel Shift Gate
CCD Clock Phase
Digital Ground
CCD Clock Phase
Digital Ground
CCD Reset Gate
Digital Ground
Clamp Gate
Digital 5V Power Supply
Changeover Switch (color and
B/W)
3-4