Scanner Drive - Ricoh Aficio MP2550B Service Manual

Scanning

6.4.2 SCANNER DRIVE

The scanner motor [A] drives the 1st scanner [B] and the 2nd scanner [C] through the
scanner drive pulley, scanner drive shaft [D], and two scanner wires [E].
Book mode -
The SBU board controls the scanner drive motor. 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 motor
speed. In the main scan direction it is done by image processing on the BICU board.
You can adjust the magnification in the sub-scan direction by changing the scanner motor
speed with SP4-008.
ARDF mode -
The scanners always stay in their home position (the scanner HP sensor [F] detects the 1st
scanner) to scan the original. The ARDF motor feeds the original through the ARDF. In
reduction/enlargement mode, the image length change in the sub-scan direction is done by
changing the ARDF motor speed. Magnification in the main scan direction is done in the
BICU board. This is the same as for book mode.
You can adjust magnification in the sub-scan direction by changing the ARDF motor speed
with SP6-017.
SM 6-19 D017/D018/D019/D020