Samsung SCX-4521F Description

System Overview

SCX-4517F is made of Main Control part, Operation Panel part, PC Interface part, Scan part,

Line Interface part, Power part.

Each part is independent with each other and the design concept is common use/standard

design rule.

Chorus2 ASIC which is made for only printer is used in the Main Control part, and another

Micom which can communicate with Chorus2 through UART for Key-Scan, LCD display, LED

control, etc.. is used for OPE Panel part.

PC Interface control part - USB 1.1 and IEEE1284 - is comprised in the Chorus2 Main

Controller ASIC and Image processor and CIS Interface part is comprised in the Chrous2 too.

Modem chip, FM336 which make a function of FACSIMILE can the machine communicate

with the other FAX machine on the speed of 33.6Kbps and the LIU(Line Interface Unit)

supports the line connection with PABX or PSTN line.

Power part which made of two part - SMPS and HVPS - supplies Voltage source to the

controller part and high voltage to the printing image developing process.

1. Engine H/W Specification

1) Recording Method : LSU(Laser Scanning Unit)

2) Printing Speed : 16ppm

(In continuing printing base A4, printing pages from 2nd to last during 1min)

3) Recording Density: 600 dpi

4) Cassette Capa. : Cassette ; 150sheets(75g/㎡Base),

1-sheet Feeding : N/A((DRIVE Selection : Paper, OHP, Envelop - 1 sheet)

5) Manual Tray : All paper 1 sheet

6) Paper Size : Cassette ,Manual; Width = 76 ~ 216mm, Length = 125mm ~

7) Effective recording size

-A4 :202x291mm

-Letter:208x273mm

- Legal : 208 x 350 mm

- Folio : 208 x 325 mm

- Top Margin : 2 ± 2 mm

- Left, Right Margin : 2 ± 2 mm

8) CRU(Toner Cartridge)Life : 3,000pages Printing(A4, ISO 5% Pattern Printing)

9) First Print Out Time : within 11sec ( Standby )

10) Warming up time : within 35sec (Ambient : 25℃)

356mm

2. Main Board Control Part

Main control part of SCX-4517F is made of ASIC(CPU, Image processor, PC I/F part

include,

Scan interface part, FAX Modem part and Printing process I/F part.

CPU handles the BUS control, I/O interface, scan interface, PC interface

and other miscellaneous driver circuit.

1) Main Board

Main Board has a function of sending Current Image Video Data to LSU of the
machine, controlling motor Driving Circuit and monitoring Paper Exit Sensor, Cover
Open switch, OPE Panel Inputs.

2) Main Controller

-CPU : Chorus2 is the main CPU and is made up on the 16/32bit RISC

architecture using ARM7TDMI core.

Main CPU controls the whole system according to the program code

which stored in the Flash-ROM memory.

-Summary of the Key Function Block:

▶

1.8V for internal Core, 3.3V for I/O Pad with 4KByte Cache.

▶

Image Processor included.

▶

On-Chip clock generator with PLL.

▶

Memory and External Bank Control.

▶

DMA Control (5-Channel)

▶

Interrupt Control.

▶

2-port USB Host/1-port USB device(ver 1.1) interface control.

▶

Parallel interface control.

▶

UART(2-Channel)

▶

Synchronous Serial Interface Control.

▶

A/D Converter(10-bit, 2channel).

▶

General I/O Port control.

▶

Tone Generator.

▶

RTC with calendar function.

▶

S/W Assistant function(Rotator)

-Flash Memory : Stores system program and can be updated to the newer system

program code through the PC interface.

It stores the FAX Journal List, One Touch dial number, speed dial number, and

machine configuration setup data.

.Capcity : 2 Mbyte

.Access Time : 70 nsec

3. Scan Part

-SDRAM : SDRAM is used for Print Buffer, Scan buffer when scanning, ECM

Buffer when FAX Receiving, and system working memory.

.Capacity : 16 Mbyte

.Access Time : 66MHz based on system bus clock.

.Data Backup : 48 Hours

.Backup Battery Charging Time : 100hours when completely discharged.

1) Image Signal Input Part

Image Signal from CIS has a level of about 1.2V and is goes to ADC of Chorus2.

After ADC, CIS analog signal will be converted to 8-bit Digital signal.

2) Image Processing

On the surface of the original paper, the light from the CIS LED reflected and goes

to the CIS Sensor. Then the light is converted to the appropriate voltage suitable for

ADC input.

Analog signal from CIS sensor is used for ADC input then is converted to 8-bit

digital data.

Image processor of the Chorus2 will do the Shading correction function at first, then

Gamma correction function next.

After then, the data goes to different module according to the copy or FAX

resolution mode.

When Text mode, the image data goes to LAT module, when Photo mode, the

image data goes to Error Diffusion module, when PC-Scan mode, the image data

goes directly to the PC through DMA access.

◇

Summary of the Image sensor interface is as below;

①

MinimumScanLineTime:1.5ms

②

Scan Resolution : 600*600 dpi

③

Scan Width : 208mm

④

function

- White Shading Correction

- Gamma Correction

- CIS Interface

- 256 Gray Scale

3) CIS Driving Part

- CIS Supply Voltage : +3.3V

- CIS Max frequency : 5MHz

-CISLinetime

Fax/Copy - 1.5ms

PC-Scan - 4.5ms

- White output volt. : Max 0.8V

4) ADF Driving Part : Driving ADF Stepper motor, and the maximum motor speed is

2000PPS.

- MOTOR DRIVER : A3978(Allegro)

- Driving Voltage : 24V DC