Xerox Phaser 3450 Service Manual page 14

Summary of Product
4.1.1 Feeding
It is consists of a basic cassette, an MP tray for supplying different types of media : envelope, label special
paper, duplex unit, and parts related to paper transferring.
1) Separation method
Separate it from the finger mounted to the cassette side guide and apply retard roller that uses a spring
clutch. A feed roller uses an electronic clutch to control driving power.
2) Basic cassette
It takes a center loading method and applies 'both side finger separating method.' It means that there is
a paper sensor, but a paper size is detected after detecting the first paper by software.
Both the side guide and the rear guide can be adjusted for for various types of papers from A5 to legal
size paper.
It has a paper existence sensing function (Capacity : 500 sheets of general paper), paper arranging
function, various size papers accepting function, SCF paper path function, and displaying function of
paper remaining amount.
In the front side, there is a paper level indicator.
3) Pick-up roller
It has functions such as a paper pickup function, driving control function, paper feeding function, and
removing electronic static function.
4) Retard roller
It takes an arrangement method which uses a stopper roller and a weight without electric actuator.It has
paper separating function, driving control function, and multi feeding prevention function.
6) Registration roller
It has a paper arranging function, paper transferring function, paper detecting function, jam removing
function, and so on.
7) MP tray
It has a paper arranging function, paper transferring function, jam removing function, and so on.
It uses rubbing pad method to feed 100 sheets of general papers and 100 envelops.
It is possible to extend to 300mm for accepting a legal size paper.
8) Duplex unit
It has paper transferring function, paper guide function, jam removing function, paper sensing function,
and main board supporting function.
It is designed for basic attachment, and the duplex feeding takes a side feeding method.
papers are A4, letter, and legal size paper.
For removing a jam occurred in a front part, it is designed to open a cassette and a guide.
It is designed to open a rear cover to remove a jam in a rear part.
If a face up tray is open, the duplex option cannot be used.
9) SCF (Second Cassette Feeder)
It is the same method with the main cassette, and the capacity is 500 sheets.
It has a separate driving mechanism and feeds only A4, letter, and legal size paper.
It is designed for a common use with a main cassette, but it cannot be attached with the main cassette.
Service Manual
4-2
Usable