Chapter 3. Mechanical Description; Mechanical Description - Sharp AM-900 Service Manual

AM-900U
CHAPTER 3. E Market Service Manual Service Manual AM-900U FAX

MECHANICAL DESCRIPTION

[1] Mechanical description
1. Facsimile block
1.1. Document feed block and diagram
Feed roller
Separate
spring
Transfer
roller
Transfer
pinch roller
ORG sensor
2. Document feed operation
1) As shown in Fig.1, the document set in the hopper (the front sensor
is on) is fed with the let out roller and paper feed roller which rotate
together with the pulse motor.
2) When a specified number of pulses are received from the docu-
ment sensor after the document lead edge is sensed, scanning will
be started.
3) When a specified number of pulses are received from the docu-
ment sensor after the document rear edge is sensed, scanning will
be ended to discharge the document to the tray.
4) If the front sensor is on (the document is set up in the hopper), the
next document is supplied and fed nearly when the last document
is completely read and discharged. If the front sensor is off (no doc-
ument is set up in the hopper), the drive will be stopped when the
document is discharged to the tray.
3. Hopper mechanism
3.1. General view
The hopper is used to align documents with the document guides
adjusted to the paper width.
NOTE: Adjust the document guides before and after inserting the doc-
ument.
Front sensor
Document
Separation
rubber plate
Exit pinch roller
Rear
Document
plate
Exit roller
CIS
Fig. 1
Fig. 2
3.2. Automatic document feed
1) Use of the paper feed roller and separation rubber plate ensures
error-free transport and separation of documents. The plate spring
presses the document to the paper feed roller to assure smooth
feeding of the document.
2) Document separation system:
Separation rubber plate/speed reduction ratio/roller backlash sepa-
ration system
Feed roller
Separate
spring
3.3. 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.
• Adjust the document guides to the document width.
• 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.
NOTE: 1) Curled edge of documents, if any, must be straighten out.
2) Do not load the documents of different sizes and/or thick-
nesses together.
3.4. Documents applicable for automatic feed
Indication
Weight Metric system
indication indication
Thickness Metric system
indication indication
Document Document size
size Range
Number of Document size
ADF sheets Weight
Paper Kind
quality
NOTE: Double-side coated documents and documents on facsimile
recording paper should be inserted manually.
Documents heavier than 80g/m
duplicated on a copier to make it operative in the facsimile.
3 – 1
First document
Last document
Separation
rubber plate
Separation plate
Fig. 3
Product specifications
Lower Limit Upper Limit
2 2
52g/m 80g/m
0.06mm 0.1mm
Minimum (148mm x 182mm)
A4 (210mm x 297mm)
Letter (216mm x 279mm)
Legal (216mm x 356mm)
Minimum ~ Letter/A4 size 20sheets
Legal 1 sheet
Paper of fine quality/bond paper/
Kent paper
2
in terms of the paper weight must be