Theory Of Operation; Introduction; Mechanical Section Operation - Lexmark 3200 Service Manual

1.6 Theory of Operation

Introduction

This section explains the theory of operation of this scanner.
The microprocessor in this scanner controls the following functions.
• Interface
• Scanning module drive
• ADF drive
• Reading mode (reading density, document size, half-tone) selection.
Figure 1.3 shows the operation mode sequence.
Reading mode setting
ADF drive/scanning module drive

Mechanical Section Operation

Scanning module drive
The carrier is driven by a 2-phase stepping motor. The stepping motor has a rotation of
1.8°(full step). And the use of micro-stepping control technique can work the motor to move
the scanning module at 1/300 inch/step.
ADF mechanism operation
The ADF is driven by a 2-phase stepping motor. The stepping motor has a rotation of 1.8°
(full step). The use of micro-stepping control technique enables the motor to move the paper
on the ADF at 1/300 inch/step.
Figure 1.3 Operation sequence
1-8
Reading