Ricoh A220 Service Manual page 103

15 July 1996
3.6 3RD SCANNER DRIVE
40 steps
To compensate the focus for reproduction and lens position changes, the 3rd
scanner (4th and 5th mirrors) position is changed.
A stepping motor [A] (approx. 0.095 mm/step) is used for the 3rd scanner
drive.
The 3rd scanner home position sensor [B] is used to detect the unit position
for full size mode. The optic control PCB keeps track of the unit position
based on the number of motor drive pulses.
[B]
[A]
(Initialize)
(Reduce/Enlarge → HP)
(Reduce/Enlarge → Reduce/Enlarge)
(Reduce/Enlarge → Reduce/Enlarge)
(Reduce/Enlarge → Enlarge/Reduce)
40 steps
A176D543.wmf
2-37
OPTICS
A176D542.wmf