Introduction - Ricoh FT7770 Service Manual

SCANNER DRIVE

1. Introduction

The scanner motor (servomotor) drives the first and second scanners at the
speed required for the selected reproduction ratio.
maintain a constant focal length.
The scanner motor drives the scanners by using two wires; one drives the
front side and the other the rear side.
wide that they would warp if they were driven on only one side.
The first scanner is directly connected to the scanner drive wires by wire
clamps. The second scanner is connected to the drive wires by moveable
pulleys and moves at half the first scanner's speed. This maintains a con-
stant focal distance between the original and the lens,
The scanner home position sensor controls the scanner stop position.
Registration and return timing are both determined by the selected reproduc-
tion ratio and are controlled by the CPU.
determined by copy paper size.
Related Service Call Conditions: See FIELD MANUAL for details.
SC 9: Scanner
SC 10: Scanner
SC 11: Scanner
SC 12: Scanner
Scanner Guide Rod (Front)
Motor Failure
Home Position Sensor Failure
Speed Abnormal
Return Abnormal
This is because the scanners are so
Return timing is, in addition,
2-17
30
Both scanners move to
April, '89