Circuit Description Of Ccd Pwb - Sharp FACSIMILE XU-107 Service Manual

UX-177H

[5] 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
boad.
(1) Block diagram
ΦT
Φ1
Φ2
ΦR
+5V
GND
OUTPUT CIRCUIT
VO
(emitter follower)
CCD
TCD1208P
OS
Fig. 8
(2) Description of blocks
1. CCD
The TCD1208P is a highly sensitive charged coupled image sensor
that consists of 2160 picture elements.
Receiving four drive signal (φT, φ2, φ1, φR) from the control board, the
tranferred photoelectric analog signal OS is impedance converted,
and the signal VO, is supplied to the control board.
2. Waveforms
1. φ1, φ2 (=φ1) signals within the control board.
φT
φ1 (=φ2)
2. OS φ
1.67µ Sec
1.67µ Sec
φR
OS
5 – 11
5m Sec
Approx. 5V
0V
Approx. 5V
0V
Approx. 5V
0V
Approx. 100mV
Fig. 9