Sharp FO-50 Service Manual Download

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FO-50RA

FO-70RA

CHAPTER 3. MECHANISM BLOCKS

[1] General description

1. Document feed block and diagram

Fig. 1

2. Document feed operation

1) The original, which is set in the document hopper, feeds automati-

cally when the front sensor is activated. This in turn activates the
pulse motor which drives the document supply roller. The document
stops when the lead edge is detected by the document sensor.

2) The lead edge of the original is fed a specified number of pulses after

the lead edge of the document is detected for the reading process to
begin.

3) The trailing edge of the original is fed a specific number of pulses

after the trailing edge of the document deactivates the document
sensor. The read process then stops and the original is discharged.

4) When the front sensor is in the OFF state (any document is not set

up in the hopper guide), the drive will be stopped when the docu-
ment is discharged.

3. Hopper mechanism

3-1. General view

3-2. Automatic document feed

1) Use of the paper feed roller and separation rubber plate ensures er-

ror-free transport and separation of documents. The plate spring
presses the document to the paper feed roller to assure smooth feed-
ing of the document.

2) Document separation method: Separation rubber plate

Fig. 3

3-3. Documents applicable for automatic feed

NOTE: Double-side coated documents and documents on facsimile re-

cording paper should be inserted manually. The document feed
quantity may be changed according to the document thickness.

Documents corresponding to a paper weight heavier than 69.2kg (80g/
m

) and lighter than 135kg (157g/m

) are acceptable for manual feed.

Documents heavier than 135kg in terms of the paper weight must be
duplicated on a copier to make it operative in the facsimile.

3-4. Loading the documents

1) Make sure that the documents are of suitable size and thickness, and

free from creases, folds, curls, wet glue, wet ink, clips, staples and
pins.

2) Place documents face down in the hopper.

i) Adjust the document guides to the document size.

ii) Align the top edge of documents and gently place them into the

hopper. The first page under the stack will be taken up by the feed
roller to get ready for transmission.

NOTES: 1) Curled edge of documents, if any, must be straightened

out.

2) Do not load the documents of different sizes and/or

thicknesses together.

3 – 1

Operation panel PWB

Back roller

Document sensor

Separator plate

Separator rubber

Hopper guide

Document

Front sensor

Paper feed roller

CIS unit

Fig. 2

The hopper section contains document guides that are used to adjust
the hopper to the width of the original document. This ensures that the
original feeds straight into the fax machine for scanning.
Document width: 148 mm to 216 mm (A5 longitudinal size to Letter

longitudinal size)

NOTE: Adjust the document guide after setting up the document.

,,,,,,,,,,,,

Separation rubber

Feed plate

Document

Paper feed roller

Paper size

148mm x 140mm ~
A4 (210mm x 297mm), Letter (216mm x 279mm)

4x6 series
(788mm x 1091mm x
1000mm sheets)

Square
meter series

Minimum