Ricoh FT8880 Service Manual page 23

RDH
Table 1
Table 2
2. Blower motor speed
To ensure good original separation and original re-stacking on the original
table, the blower motor speed is changed according to the original stack
height, or the number of originals stacked. The blower motor speed is
determined for the 1st copy cycle by the original stack height as detected by
the original height sensor [A] (Table 1). From the 2nd copy cycle, the blower
motor speed is determined by the number of originals counted by the main
PCB (Table 2).
When the number of the originals is 3 or less, the original set sensor is
de-activated when the last original is fed and before the 1st original returns to
the original table. During this period the blower motor stops rotating to ensure
correct stacking the originals.
A4
Small
8 x 10
Size
8 x 11
1/2
8 x 13
1/2
B4
A3
Large
8 x 14
1/2
Size
10 x 14
11 x 17
A4
Small
8 x 10
1/2
Size
8 x 11
1/2
8 x 13
1/2
B4
A3
Large
8 x 14
1/2
Size
10 x 14
11 x 17
[A]
Original Height Sensor
OFF
1/2
3000 rpm
3500 rpm
Number of Originals
5 or less
3000 rpm
2-12
ON
6000 rpm
from 6 to 12 13 or more
6000 rpm
3500 rpm
5 June 1992