Ricoh D009, Service Manual

Page: 561 / 1165

Scanning
SM 6-11 D009/D011/D012/D013
Det
ailed
Des
cription
s
6.4 SCANNING
6.4.1 OVERVIEW
1. Scanner HP sensor
2. ADF exposure glass
3. 2nd scanner (2nd carriage)
4. Scanner lamp
5. 1st scanner (1st carriage)
6. Exposure glass
7. Sensor board unit (SBU)
8. Lens block
9. Original length sensor
10. Scanner motor
11. Original width sensor
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.