Ricoh Robin Service Manual page 34

24 June 1994
3.4 4TH/5TH MIRROR DRIVE (A152 copier only)
3.4.1 Drive
The 4th/5th mirror drive motor (stepper motor) changes the 4th/5th mirror
assembly position through the pinion gears [A] and the rack gear [B] in
accordance with the selected reproduction ratio to provide the proper optical
distance between the lens and drum surface.
3.4.2 Positioning
The positioning mechanism is similar to that of lens positioning, as shown in
the above positioning chart. The 4th/5th mirror assembly always stops while
moving from right to left (as viewed from the front).
[B]
[A]
Home Position (100%)
2-15
OPTICS
(100% → 141/129%)
(141/129% → 71/65%)
(71/65% → 93%)
(93% → 71/65%)
(71/65% → 141/129%)
(141/129% → 122/121%)
(122/121% → 141/129%)
(122/121% → 100%)
(100% → 71/65%)
(71/65% → 100%)