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FO-4500H
[4] Circuit description of CCD PWB
The CCD board picks up optical information from the document, con-
verts it into an electrical (analog) signal and transfers it to the control
board.
1. Block diagram
Φ
T
Φ
1
Φ
2
+5V
AG
VO
2. Description of blocks
1) CCD
The µPD3753CY is a highly sensitive charged coupled image sensor
that consists of 2088 picture elements.
Receiving there drive signals (φT, φ2, φ1) from the control board.
2) Waveforms
1. φ1, φ2 ...signals within the control board.
Φ
1
Φ
2
CCD
µPD3753CY
Fig.10
Fig. 11
[5] Circuit description of operation PWB
1. Block diagram
PANEL PWB
SEN1
SEN2
SEN3
SEN4
SEN5
SEN6
LD0 ~ LD7
LCD DRIVER
LCD
COG (LMG2022-TPR)
2. Operational description
1) Panel PWB
The panel PWB includes the ten key scan circuit and the LED lighting
circuit.The LS145 is controlled through LD0~LD3 (4 bits) and ten key
detection is performed. The HC174 is controlled through LD0~LD5 (6
bits) to provide LED lighting information.
2) COG (LMG2022-TPR)
The COG uses the one-chip LCD driver IC to display 20 digits x 2
lines. The LCD display density is controlled with an extemal resistor.
5 – 22
+5V
ULN2003
ULN2003
LS145
HC174
Fig. 12
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