Ricoh DD 5450, Field Service Manual, Page: 107 / 403

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105
Chapter 3 Scanner Section
CN3-1
～
-6
CN2-2
-1
-3
CN1-1
-16
32
31
30
5
6
7
CN6-5
-6
-7
CN6-1
-16
(3) CCD / Lamp
•
CCD
No. Item Specification
1
Optical signal storage time (SH
cycle)
0.8 msec./ line
2 Frequency 15MHz
3
The number of effective picture
elements
7500 picture elements
4
Reading width
(This is not the image width which
can be processed.)
318mm
5
Reading
density
primary scanning 300dpi(11.8 dots)
secondary scanning 600dpi(23.6 dots)
Specification
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
Document
Lamp Lamp Inverter unit
CCD PCB unit
Blue
Gray
Brown
Drive PCB unit
Main PCB unit
◦
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) .
GND
+24V
1