SCX-4521F/SCX-4321 Series trainingHardware

SCX-4521F/SCX-4321 Series trainingHardware

June, 2005June, 2005

AgendaAgenda

1. Overview

2. Block Diagram

3. Connection Diagram

4. Schematic – Key concept

5. Front Cover and Jam Cover open

6. Toner Cartridge

7. Tech mode

Ⅰ. Introduction

Main BoardSMPS

1. Overview

HVPS

ADF Board

OPE Board

LIU Board

Ⅰ. Introduction

2. Block Diagram of SCX-4521F

USB 1.1

IEEE1284MAIN

LSU CTL

AUDIO PART

MODEM(FM336)33.6Kbps

MODEM PART

S3C46Q0X

ARM9TDMI

GEU

P1284

USB 1.1

ITU

I/O I/F

DMAC

PVC

UART*2

MEMORY I/F

CACHE(4K)

Image Processor

RESET

FLASHMEMORY(2MB)

SDRAM(16MB)

EXTERNALGPO

74LVX273

HR(Zener)

26P

AC 110V / 220V

MHV

SUPPLY

DEV

THV

REAR COVEROPEN S/W

+5V/+24V

INLET &POWER S/W

HVPS

SMPS

OPC GND

FUSERAC PWR

2P

2P

LIU

11P

LINE

Ext. PHONE

MODEM &EXT.PHONESEPERATING

PART

LINEINTERFACE

TRANSFORMER

600 : 600TX : RX

EXT. PHONEINTERFACEPART

7P

PlatenMOTORDRIVER

(3718 X 2)

CIS Home Detect OPC 1

BLADE2P

CIS (600dpi,Color) CIS SIG.AFE

12P

FRONT Cover

OPEN S/W

FAN

11P 4P4P

LCD(16x2) HT48C50

LCD/LED DRIVER

KEY SCAN

SENSOR DRIVER

OPE

14P

+12VRegulator

16P

ADF

DOC-Empty

DOC-Exit

DOC-Regi

ADF_MOTDriver(3718X 2)

SCANMOTOR

4P

MainMOTOR

2P

MAINMOTORDRIVER(A3978SLP)

PlatMOTOR

MainCLUTCH

Battery

24VS2

LSUSWITCH

FEED SENSOR

EXIT SENSOR

P_EMPTYSENSOR

9P

16P

THERMISTOR

+24V1

24V1

DEV_DET

2PLSU

LSU_5V

3P

Ⅰ. Introduction

CPU – Chorus2

4-1. Main PBA - II

Chorus2(S3C46Q0X) is developed using ARM7TDMI core, 0.18um CMOS standard cell 1.8V internal, 3.3V external(I/O boundary) Voltage used. 16bit/32bit RISC architecture and 16bit external data bus. Image processor included. On-Chip clock generator with internal PLL. USB Device(Ver 1.1) interface controller included. Parallel Port Interface controller included. Operating frequency 66MHz ( converting 10MHz main clock to 66MHz operating clocl using inte

rnal PLL )

Ⅰ. Introduction

SDRAM – 8MB * 2ea

4-1. Main PBA - III

Two SDRAM chips (Max operating frequency : 133MHz) are used each SDRAM has 8MByte memory capacity.

SDRAMs operates 66MHz which is the same as CPU’s operating frequency. Flash ROM( Nor flash ) has 2MB memory capacity and its access time is

max. 70ns. Firmware is stored in the FlashROM this can be upgraded by user. When upgrading F/W, never turn off the power until completing upgrade pr

ocess. If the user turn off the power while upgrading F/W, the program code will c

onflict and the machine will not work. If above situation occurs, replace the Main PBA.

Flash ROM – 2MB

Ⅰ. Introduction

4-1. Main PBA - V

A3977SLP is a stepping motor driver IC with integrated step and direction translator interface.

Direction Pin is tied to Vcc(High level) because the engine motor always rotate only one way.

Stepping resolution Pin(MS1, MS2) tied to GND there is no need to control any other resolution except Full-Step.

Current setting of the motor current is about 1.3A peak. Output voltage and output current of the A3977SLP appears like left side i

mage (oscilloscope waveform)

Engine Motor Driver(A3977SLP)

Vout

Iout

Ⅰ. Introduction

4-1. Main PBA - VI

TEA3718 is a stepper motor driver IC. TEA3718 IC uses a pair of outputs, and stepper motor

needs 2pairs of outputs, so 2 ICs used for driving platen motors.

Platen motor can be driven forward or backward direction and full-step, halt-step, quarter-step resolution by controlling 6 control inputs based on pre-defined control sequence.

Platen motor driving current is 0.5A on peak level.

Platen Motor driver(TEA3718)

Ⅰ. Introduction

4-1. Main PBA - VII

SCX-4x21 series has EEPROM in order to store environmental datum, total page count data, dot counter data, etc…

M24C04(4Kbit) EEPROM device is used. Read/Write operation is activated when the machine

states go idle. While printing, Copying, scanning or FAX transmitting,

EEPROM read/write operation not activated. Because of this, if the user turn the power off right after

the printed page has exited, there is no time for writing newer data therefore dot count and page count data will not be updated.

Machine requires 2sec for updating EEPROM data after final page exit.

EEPROM – M24C04

Ⅰ. Introduction

4-1. Main PBA – Differences between 4-in-1 and 3-in-1

SCX-4521F is a 4-in-1 machine, while SCX-4321 is a 3-in-1. SCX-4321 has no FAX function. SCX-4521F and SCX-4321 has basically the same PCB, but some parts which related on FAX function are

different.

The different parts between SCX-4521F and SCX-4321 are marked above picture. See area marked ( ).

Parts relating to FAX function and speaker function are not mounted on the board. The Battery back-up function and RTC(real time clock) function have also been deleted on the SCX-4321

compared with SCX-4521F.(The crystal resonator used for the RTC function is also not mounted . See box marked )

SCX-4521F Main Board SCX-4321 Main Board

1

1

2

2

Ⅰ. Introduction

4-2. ADF PBA - I

ADF Motor drive IC is used TEA3718 – the same part as used in platen motor driver. ADF Motor driving current is about 0.8A peak.

ADF Motor Driver IC – TEA3718

Ⅰ. Introduction

4-2. ADF PBA - II

3 photo sensors exist on the ADF board. The first sensor- marked 1- detects whether the original document is on the ADF or not. The second sensor- marked 2 – detects the position of the original document for registration. The third sensor – marked 3 – detects the position stating scanning of the original document. If something prevent emitted ray from reaching base of the photo TR, sensor output goes High level, and if there is nothing interruptting emitted ray to photo TR, sensor output goes Low level.

Photo Sensor

1

2 3

II. Summary of Product

4-5. SMPS PBA - I

SCX-4521F SMPS is almost same as ML-2010/2015.

The only difference between SCX-4521F and ML-2010 is 24V output current.

• ML-2010 : 2.0A for 24V output• SCX-4521F : 2.5A for 24V output

On the SMPS board, Jam cover switch and paper-regi sensor exists.

II. Summary of Product

4-6. HVPS PBA - I

HVPS board is exactly the same as ML-2010/2015 priter machine.

SCX-4521F does not use SW2, LED1 and LED2. but they still places because they are used on ML-2010/2015.

Two photo-sensor s take place – Paper empty sensor and paper exit sensor

Cover open sensor is on the board.

PAPER-EXIT SENSOR

There are two user protection switches on this unit.If either of the two switches are opened, the +24V for DC fan, solenoid, main motor, polygon motor part of LSU and high voltage of HVPS is cut off.The will LCD display “Front cover or Rear cover open” until the respective cover has been closed.

II. Summary of Product

5. Front Cover & Jam Cover Open Sensing

SMPS Main HVPS

24V

24VS1

Jam cover switch

24V

24VS2 24VS

2

front cover switch

II. Summary of Product

Toner Cartridge Sensing

LSU switch is the back of the machine, it is closed if Cartridge is inserted. If user insert cartridge then LSU switch closed, LSU_5V is apply to LSU in order to +5V voltage to

apply to the LD board for laser scanning. LSU_5V is goes high, CRU_DET2 signal goes low. In other words, if cartridge is inserted CRU_DET

signal level goes low, if cartridge is pulled out, CRU_DET2 signal goes high. CPU detects the CRU_DET2 signal level and flags whether cartridge is in the machine.

6. Toner Cartridge Sensing and Dot counting

LSU_5V switch

connector

Dot Counting Method No toner level sensor. Instead of level sensor, software dot counting method is used. Want to view the Dot count? Print system data list, then you can see used dot count bottom of

the page. Toner Low : 3,380,000,000 dots (3K cartridge) / 1,159,000,000 dots (initial cartridge) Toner Empty : 4,050,000,000 dots (3K cartridge) / 1,385,000,000 dots (initial cartridge)

II. Summary of Product

7. Useful function for troubleshooting – Tech Mode

All samsung MFP has useful function for troubleshooting. Frequently used modes are <Engine Test mode>, <Tech Mode>

Engine Test Mode

Engine test mode is available by pressing “Menu → # → 1 → 9 → 3 → 1” If you pressing correctly, you can see “Engine Test” on the LCD. You can test some parts related printer engine like Solenoid, Engine motor, LSU,

HVPS, etc… It is not difficult to use, so you just press buttons correct sequence and you could

know how to use. Remember that you can test engine part just pressing “Menu → # → 1 → 9 → 3 → 1”

in sequence.

Tech Mode

Tech mode is available by pressing “Menu → # → 1 → 9 → 3 → 4” You can test below functions by using tech mode.

1. DRAM test2. Engine pattern printing3. Shading test4. F/W version check5. Switch test6. Some expanded menus are accessible for test.

Like engine test mode, you could know the usage of each function. Remember only one that you can access helpful test mode by pressing

“Menu → # → 1 → 9 → 3 → 4” in sequence.