Gestetner A294, Service Manual

Page: 64 / 600

SCANNING
A294/A295 2-14 SM
2.2.2 SCANNER DRIVE
The scanner drive motor is a dc servo motor. 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].
The MCU board controls the scanner drive motor. In full size mode, the 1st scanner
speed is 425 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 is changed in the sub scan direction by
changing the scanner drive motor speed, and in the main scan direction it is
changed by image processing on the SICU board.
Magnification in the sub-scan direction can be adjusted by changing the scanner
drive motor speed using SP4-008.
A294D003.WMF
[G]
[A]
[B]
[E]
[D]
[C]
[F]
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA