Xerox Document FaxCentre 165c Service Manual page 97

- area "A", for testing lens focussing
- area "B", for testing that the document and the CCD are centred
- area "C", for checking that the edges of the document are scanned
- area "D", for testing the black level
- area "E", for testing the scanning position
2) Check that the VIDEO signal moves parallel to the horizontal lines on the screen
and that the lines in area "D" are symmetrical and parallel to the ground line (see
figure 6-9)
"D"
VIDEO
RS
3) If they do not, loosen the screws on the CCD board, turn the board to the desired
position and tighten the screws (see figure 6-10)
CCD board
XEROX DFC165 & DWC165c Service Manual
CH1 200mV A
CH2 5V
Fig. 6-10
500µs 1.02 V
Fig. 6-9
EXT2
"D"
screws
6-15