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6-17
XEROX DFC165 & DWC165c Service Manual
6.3.4 Checking That the Document and the CCD Are Centred
1) Set the EVENT COUNTER of the oscilloscope to 1037
2) Check that the VIDEO signal corresponding to area "B" of the jig has a negative
peak aligned to the T marks (a deviation of
±
5 events is acceptable) (see figure
6-13)
Fig. 6-13
3) If it has not, move the plate sideways to the desired position.
4) Check that the VIDEO signal for areas "C" of the jig (on right and left) has three
negative peaks corresponding to the three lines in the same area (see figure 6-14),
and then tighten the screws.
Fig. 6-14
5) Having adjusted the CCD, make the SCANNER SHADING (see section 6.1.8).
n
VIDEO
T
T
→ ←
±
5 fronti
RS
CH1
200mV
A
5
µ
s
1.02 V
EXT2
CH2
5V
EVENTS COUNT = 1037
"B"
"C"
CH1
200mV
A
20
µ
s
1.02 V
EXT2
CH2
5V
RS
VIDEO
.
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