Overview - Gestetner B003 Service Manual

6.4 SCANNING

6.4.1 OVERVIEW

12
11
10 9
1 Exposure lamp
2 1st Scanner
3 Exposure glass
4 Lens block
5 Scanner drive motor
6 Original length sensor 3
The original is illuminated by the exposure lamp (a xenon lamp). The image is
reflected onto a CCD (charge coupled device) on the lens block via the 1st, 2nd,
and 3rd mirrors, and through the lens on the lens block.
The 1st scanner consists of the exposure lamp, a reflector, and the 1st mirror.
The exposure lamp is energized by a dc supply to avoid uneven light intensity
while the 1st scanner moves in the sub scan direction (down the page). The entire
exposure lamp surface is frosted to ensure even exposure in the main scan
direction (across the page).
The light reflected by the reflector is of almost equal intensity in all directions, to
reduce shadows on pasted originals.
When the optional optics anti-condensation heater is installed on the left side of the
scanner, it turns on whenever the power cord is plugged in.
SM
2
1 3
8
7 Original length sensors 1, 2
8 Original width sensors
9 2nd Scanner
10 Anti-condensation heater (option)
11 Exposure glass (for document feeder)
12 Scanner HP sensor
6-11
SCANNING
4
5
7 6
B004D101.WMF
B003/B004/B006/B007