Ricoh C231 Service Manual page 638

SCANNER AND OPTICS
6.4.2 SCANNER DRIVE
[I] [G] [A]
[B]
[C]
[D]
[E]
[H]
[F]
C267D026.WMF
A stepper motor drives the 1st and 2nd scanners [A, B]. The 1st scanner is driven
by the scanner drive motor [C], timing belt [D], scanner drive pulley [E], scanner
drive shaft [F], and two timing belts [G]. The 2nd scanner is driven through the 1st
scanner and two timing belts [H].
- Book mode -
The MPU controls and operates the scanner drive motor. In full size mode, the 1st
scanner speed is 200 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 MPU board.
Magnification in the sub-scan direction can be adjusted by changing the scanner
drive motor speed using SP6-5. Magnification in the main scan direction can be
adjusted using SP6-1.
- ADF mode -
The scanners are always kept at their home position (the scanner H.P. sensor [I]
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 MPU board, like for book mode.
Magnification in the sub-scan direction can be adjusted by changing the ADF motor
speed using SP6-6. In the main scan direction, it can be adjusted with SP6-2, like
for book mode.
SM 6-7 C267