Ricoh DD5450 Field Service Manual page 107

(3) CCD / Lamp
Description
The lamp illuminates the document and the reflected light is transmitted onto the CCDs.The CCDs
output the image signals in level of voltage.
Circuit
Lamp
Document
Specification
•
CCD
No. Item
Optical signal storage time (SH
1
cycle)
2 Frequency
The number of effective picture
3
elements
Reading width
4 (This is not the image width which
can be processed.)
primary scanning
Reading
5
density
secondary scanning
◦ Lamp
This machine adopts a white LED lamp which is lit quickly when turned on, and the quantity of light
is stable.
The lamp is lit when the the control signal CN2-1 for the CCD PCB unit is LOW (0V) .
Lamp Inverter unit
CN2-2
CN3-1
-1
-6
-3
CCD PCB unit
CN1-1
-16
Specification
0.8 msec./ line
15MHz
7500 picture elements
318mm
300dpi(11.8 dots)
600dpi(23.6 dots)
Chapter 3
Drive PCB unit
Blue
GND
32 5 CN6-5
Gray
31 6 -6
+24V
Brown
30 7 -7
Main PCB unit
CN6-1
-16
Scanner Section
1
３
105