Sharp SF-A57 Service Manual page 13

Table of Contents

B. Original size detection

The original size is detected in three ways.

1) Original size detection by the original set tray

The original size detection by the original set tray is used in automatic

paper size and automatic magnification selection mode, in order to

recognize the original size when the original is set on the original tray,

allowing the automatic selection of paper size and magnification ratio

of copy.

When originals composed of sheets of different sizes are set, this

detection method recognizes the largest sheet as the original size,

which is determined by the width measured by the original width

volume (DWVR) and the length measured by the original length sen-

sors (DLS1, DLS2).

The original size is determined when the paper is sensed by the

original set sensor (DSS).

DWVR

DLS1

DLS2

Document size,

setting orientation

A5R

AB series

B5R

A4R

11" × 8.5"

8.5" × 5.5"

8.5" × 5.5"R

Inch series

11" × 8.5R"

14" × 8.5"

11" × 17"

– 12 –

: ON or L output (sensed)

: OFF or H output

DWVR

DLS1

DLS2

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