Oce 3121 Technical & Service Manual page 225

'Scanner home'
Scanner home
sensor PS1
position sensor
general view
2 Varying the Reproduction Ratio
The reproduction ratio in the forward direction is changed by skipping image
signals (reduction), when writing into line memory. Or reading a multiple
number of times (enlargement), when reading from the line memory.
The reproduction ratio in the reverse direction is changed by moving the mirror
faster (reduction) or slower (enlargement).
502 TSM Océ 3121
Scanner motor
M2
PS1
Reverse
Reverse
Mirror support 2
Mirror mount
Scanner motor
M2
Forward
Forward
Mirror support 1
number 1 mirror mount
Functional description