Scanner Drive; Book Mode; Ardf Mode - Ricoh B156 Service Manual

6.5.2 SCANNER DRIVE

[G]
[F]
Scanner drive: Scanner motor [A]
drive shaft [D] Scanner wires [E and F]

Book Mode

The scanner I/O board controls the scanner motor.
The 1st scanner moves twice as fast as the 2nd scanner.
For reduction/enlargement, the scanning speed depends on the magnification ratio.
The returning speed is always the same, regardless of magnification ratio.
Sub-scan magnification is controlled by the scanner motor speed. Main-scan
magnification is controlled by image processing on the BICU board.
NOTE: Sub-scan magnification errors can be corrected by changing the scanner-
motor speed (

ARDF Mode

The 1st and 2nd scanners stay at their home positions; the scanner HP sensor
detects the 1st scanner position, and the 2nd scanner position is linked with that of
the 1st scanner.
Sub-scan magnification is controlled by the ADF feed speed. Main-scan
magnification is controlled by image processing on the BICU board.
NOTE: Sub-scan magnification errors can be corrected by changing the ADF feed-
speed ( SP6-006-5).
B156/B220
CÓPIA NÃO CONTROLADA
[B]
Scanner drive pulley [B and C], and scanner
SP4-008).
CÓPIA NÃO CONTROLADA
[H]
[D]
1st [G] and 2nd [H] scanners
6-20
SCANNING
[C]
[A]
[E]
B156D010.WMF
SM