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(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.
SHPSW
MSW
DFCHSOL
Fwd.rotation
SM
Rev.rotation
EL
SHPSW
• When the scanner home position switch (SHPSW) is off at power-on
a: After the main switch (MSW) is turned on, the scanner motor (SM) rotates in reverse, which turns off 400 scanner
motor pulses after the scanner home position switch (SHPSW) turns on.
b: 35 ms after the scanner motor (SM) turns off, it rotates forward, which turns off 160 scanner motor pulses after the
scanner home position switch (SHPSW) turns off.
c: Lighting of the exposure lamp is confirmed, the AGC is performed and shading is corrected.
d: The scanner motor (SM) rotates in reverse for 412 scanner motor pulses, at the end of which the scanner stops at
the scanning start position for the original on the contact glass.
SM
DFOCSW
Figure 2-1-6 Optional section block diagram
800 ms
800 ms
800 P
400 P
Timing chart 2-1-5 Scanner operation (1)
Original
EL
CCDPCB
INPCB
MPCB
Lamp-on confirmation, AGC and shading
a
b
160 P
35 ms
412 P
c
d
2A1/2
2-1-7
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