Samsung ML-4550 Service Manual

Also see for ML ML-4551N: Specifications Solution guide Quick install guide User guide Declaration of conformity

Contents

Service ManualSummary of Product3-8 Samsung Electronics3.2.1 FeedingIt is consists of a basic cassette, an MP tray for supplying different types of media : envelope, label spe-cial paper, duplex unit, and parts related to paper transferring.1) Separation methodSeparate it from the friction pad mounted to the center of the cassette and apply retard roller thatuses a spring clutch. A feed roller uses an electronic clutch to control driving power.2) Basic cassetteIt takes a center loading method and applies 'friction pad separating method.' It means that there isa 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 tolegal size paper.It has a paper existence sensing function (Capacity: 500 sheets of general paper), paper arrangingfunction, various size papers accepting function, SCF paper path function, and displaying functionof paper remaining amount.In the front side, there is a paper level indicator.3) Pick-up rollerIt has functions such as a paper pickup function, driving control function, paper feeding function,and removing electronic static function.4) Retard rollerIt 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 rollerIt has a paper arranging function, paper transferring function, paper detecting function, jam remov-ing function, and so on.7) MP trayIt 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 10 envelops.It is possible to extend to 300mm for accepting a legal size paper.8) Duplex unitIt has paper transferring function, paper guide function, jam removing function, paper sensing func-tion, and main board supporting function.It is designed for basic attachment, and the duplex feeding takes a side feeding method. Usablepapers 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. It is designed for a common use with a main cassette.