Ricoh Aficio 2022, Service Manual

Page: 63 / 849

SCANNING
SM 2-3 B089/B093
Detailed
De
scriptio
ns
2.2.2 SCANNER DRIVE
A stepper motor drives the scanner. The 1st and 2nd scanners [A,B] are driven by
the scanner drive motor [C] through the timing belt [D], scanner drive pulley [E],
scanner drive shaft [F], and two scanner wires [G].
- Book mode -
The scanner drive board controls and operates the scanner drive motor. In full size
mode, the 1st scanner speed is 150 mm/s during scanning. The 2nd scanner
speed is half that of the 1st scanner.
In reduction or enlargement mode, the scanning speed depends on the
magnification ratio. The returning speed is always the same, whether in full size or
magnification mode. The image length change in the sub scan direction is done by
changing the scanner drive motor speed, and in the main scan direction it is done
by image processing on the IPU board.
Magnification in the sub-scan direction can be adjusted by changing the scanner
drive motor speed using SP4009. Magnification in the main scan direction can be
adjusted using SP4008.
- ADF mode -
The scanners are always kept at their home position (the scanner H.P sensor [H]
detects the 1st scanner) to scan the original. The ADF motor feeds the original
through the ADF. In reduction/enlargement mode, the image length change in the
sub-scan direction is done by changing the ADF motor speed. Magnification in the
main scan direction is done in the IPU board, like for book mode.
Magnification in the sub-scan direction can be adjusted by changing the ADF motor
speed using SP6006. In the main scan direction, it can be adjusted with SP4008,
like for book mode.
B022D002.WMF
[A]
[B]
[C]
[D]
[E]
[F]
[G]
[E]
[G]
[H]