Olivetti d-Copia 300, Service Manual

Page: 282 / 351

2FD/2FF/2FG
2-1-8
(1) Original scanning
The original image is illuminated by the exposure lamp (EL) and scanned by the CCD PCB (CCDPCB) in the image
scanning unit via the three mirrors, the reflected light being converted to an electrical signal.
The scanner and mirror frames travel to scan on the optical rails on the front and rear of the machine to scan from side to
side. The speed of the mirror frames is half the speed of the scanner.
When the DF* is used, the scanner and mirror frames stop at the DF original scanning position to start scanning.
* Optional.
YC2-1-
YC4-2 YC5-2
YC2-6
YC37-1- YC37-14 YC34-1- YC34-15
YC1-1- YC1-14
YC3-2
YC3-1-
CN1-2
CN1-1-
SDPCB
INPCB
CCDPCB
MPCB
SM
SHPSW
ODSW
EL
Original
Figure 2-1-8 Optional section block diagram
Start key
SM
Fwd. rotation
Rev. rotation
SHPSW
FVSYNC signal
338 P
472 P
9922 P
10394 P
200 P
200 P
Timing chart 2-1-4 Scanner operation
a
: When the start key is pressed, the scanner motor (SM) reverses for 338 pulses and then rotates forward.
b
: 472 pulses after the scanner motor (SM) starts rotating forward, the FVSYNC signal turns on for 9922 pulses for
scanning.
c
: The scanner motor (SM) reverses for 10394 pulses and then rotates forward.
d
: 200 pulses after the scanner home position switch (SHPSW) turns on, the scanner motor (SM) reverses.
e
: 200 pulses after the scanner home position switch (SHPSW) turns off, the scanner motor (SM) turns off, and the
scanner stops at its home position.