Samsung SF4300 Circuit Descriptions

Page 1

Samsung Electronics 5-1

5. CIRCUIT

5-1 MAIN PBA

5-1-1 SUMMARY

The main circuit that consists of CPU, MFP controller (built-in RISC processor core: ARM7TDMI) including various I/O device drivers, system memory, scanner, printer, motor driver, PC I/F, and FAX transceiver controls the whole system. The entire structure of the main circuit is as follows:

Fig.5-1-1. Entire Structure of Main Circuit for Each Key Signal

LIU-TXD

MCLK(30MHz)

/POR

/ROMCS

/RD, /WR

D0~D15

D0~D7

A0~A17

A0~A9

A0~A4

/RST-OUT

PD0~PD7

/P-ERROR

/P-PE

/P-BUSY

/P-ACK

/P-SLCT

/P-INIT

/P-STB 245DIR

/P-SLCTIN

/P-AUTOFD

/MCS

/MIRQ

/RD, /WR

/RASO, 1

/WR

/UCAS,

/LCAS

/F-POR

LIU-RXD

IP-CLK

/XDACK

/XDREQ

/IP-CS

/RD, /WR

D0~D15

A0~A4

LFPHA

MFP CONTROLLER

(KS32C6200)

LFPHB

LFIA0 LFIA1

LFIB0 LFIB1

CR-REF

CRPHA CRPHB

CRIA0 CRIA1 CRIB0 CRIB1

/HEAD-EN

HEAD-DATA

/HGA1~/HGA13

HOE1~HOE16

OK2PRINT

/FAULT-TEST

BIASOFF

/RST-OUT

LIU (STI9510)

COKOR IMAGE

PROCESSOR

FLASH

MEMORY

DRAM

MODEM

PARALLEL

INTERFACE

(IEEE1284)

LF MOTOR

DRIVER

CR MOTOR

DRIVER

PRINT HEAD’

DRIVER &

CONTROL

CIRCUIT

Page 2

5-2 Samsung Electronics

MFP Controller consists of CPU(ARM7TDMI RISC processor), 2K-byte cache, data and address buses, serial communication part with LIU(Line Interface Unit), print head controller, parallel port interface, external DMA part to receive data from external color image processor (CIPIA:U17), LF/CR motor diver controller and I/O controller.

5-1-2-1. SYSTEM CLOCK

The internal clock frequency is 30MHz. 30MHz system clock (MCLK) supplied from the outside is used without being divided inside.

5-1-2-2. DATA & ADDRESS BUS CONTROL

¥ /RD & /WR

/RD & /WR signals are synchronized with MCLK(30MHz) and become LOW ACTIVE. These signals are strobe signals used to read and write data when each CHIP SELECT is connected with /RD and /WR pin of RAM, ROM, MODEM and the outside devices and becomes active.

¥ CHIP SELECT (/CSO, /ROMCS, /MCS)

- /IP-CS : CIP1A(U17) CHIP SELECT (LOW ACTIVE)

- /ROMCS : ROM/FLASH MEMORY(U10) CHIP SELECT (LOW ACTIVE)

- /MCS : MODEM(U21) CHIP SELECT (LOW ACTIVE)

When each CHIP SELECT is low, data can be read or written.

¥ D0 - D15

- 16bit data bus

¥ A0 - A17

- ADDRESS BUS (A18 - A21 are reserved.)

5-1-2 MFP CONTRLLER (KS32C6200 : U15)

Page 3

Samsung Electronics 5-3

UART (Universal Asynchronous Receiver/Transmitter) at KS32C6200 enables the main and LIU to transmit serial data. The block diagram of UART is as follows: (Fig.5-1-2) KS32C6200 has 2 UART channels. Channel 0(RXD0, TXD0) is used here and the baud rate is 9600bps.

5-1-2-3, LIU(Line Interface Unit) SERIAL COMMUNICATION PART

TxD

RxD

IRS

IR Tx

Encoder

IR Rx

Decoder

RxD

UART

Block

Fig.5-1-2. UART BLOCK DIAGRAM

TXD :

START D0 D1 D2 D3 D4 D5 D6 D7 STOP

RXD :

START D0 D1 D2 D3 D4 D5 D6 D7 STOP

Fig.5-1-3 UART DATAFORMAT

START, STOP : 1BIT EACH BAUD RATE : 9600bps CPU I/F : SUPPORTS BOTH INTERRUPT & POLLING DRIVEN PARITY : NO

Page 4

5-4 Samsung Electronics

It brings data from an external device (CIP1A:U17) using DMA channel 0. DMA REQUEST sent from an external device to KS32C6200 activates DMAACKNOWLEDGE signal and drives DMAchannel 0 to produce CHIP SELECT and READ STROBE (/RD) at the external device and bring data from it. It generates address of destination memory, CHIP SELECT and WRITE STROBE (/WR) in order to move this data into destination memory, and then stores the data.

5-1-2-4 External DMA

MCLK

/XDREQ

/XDACK

D[15:0]

/RD

/WR

Fig.5-1-4 EXTERNAL DMA TIMING DIAGRAM

Page 5

Samsung Electronics 5-5

As KS32C6200 has DRAM controller in it, DRAM can be connected with external memory. The control mode of DRAM controller enabling EARLY WRITE, NORMAL READ, PAGE MODE, and BYTE/HALF WORD ACCESS supports EDO DRAM as well as normal DRAM. DRAM READ/WRITE signals are /RD and /WR signals used to control system buses. It supports CAS BEFORE RAS for DRAM REFRESH and self-refresh mode for DRAM backup. Connected with common /LCAS, /UCAS and RAS[1:0], it consists of 2 banks. Though each may be connected with up to 1M - 4M halfword, 512 Kbytes or 2 Mbytes are connected according to the model for this product.

5-1-2-6. PARALLEL PORT INTERFACE

This part connected with the computer through the centronics connector makes possible parallel interface with the computer. Data is transmitted according to the standard of IEEE P1284. This MFP controller supports compatibility mode the traditional way to transmit print data, nibble mode (4bit data) to upload data to the computer, and duplex high-speed transmission with the computer ECP(Extended Capabilities Port: 8bit data transmission) all together. It enables PC data to be printed and scanned data to be uploaded quickly to the computer. Besides, various data transmission and reception with the computer such as uploading received fax data, downloading fax data to be sent, and monitoring system control signals and system conditions are carried out here.

5-1-2-5. DRAM CONTROLLER

PPD(7 : 0)

DATA

BUSY

nSTROBE

nACK

Fig.5-1-5 Compatibility Hardware handshaking Timing

Page 6

5-6 Samsung Electronics

nSTROBE

BUSY

PPD(7 : 0)

nAUTOFD

BYTE0

DATA BYTE COMMAND BYTE

BYTE1

Fig.5-1-6 ECP Hardware Handshaking Timing (forward)

nACK

nAUTOFD

PPD(7 : 0)

BUSY

nINIT

BYTE0

DATA BYTE COMMAND BYTE

BYTE1

Fig.5-1-7 ECP Hardware Handshaking Timing (reverse)

Page 7

Samsung Electronics 5-7

This part produces major control signals used to drive INKJET head. It consists of signals to drive head nozzles, /PHGA[13:1], PHOE[16:1], /FAULT-TEST, /HEAD-EN, and BIASOFF, and consists of signals to check the status of the head, OK 2PRINT and HEAD-DATA. It has double height print head system, 208 nozzles for mono and 192 nozzles for color, and uses /PHGA[13:1], /PHOE[16:1] signals and /HEAD-EN to drive these nozzles. Fig.5-1-8 is timing diagram of each signal.

5-1-2-7. INKJET HEAD CONTROLLER

/PHGA

Signal

PHOE

Signal

Fire Enable Timer

Pre-Heat Pulse Width

Front End Delay Back End DelayPr-Heat Delay Width

Fire Pulse Width

p (PD)

Fig.5-1-8 Timing Diagram to Drive Head

Page 8

5-8 Samsung Electronics

/HEAD-EN

/PHGA1 /PHGA2

/PHGA3 /PHGA4

/PHGA5 /PHGA6

/PHGA7 /PHGA8 /PHGA9

/PHGA10 /PHGA11

/PHGA12 /PHGA13

(Tp)

PHOE1-

PHOE16

Fig.5-1-9. Timing Diagram for Each Nozzle

The above control signals are sent to head driver and the head driver converts these signals to the level (+11.75V) to drive head nozzles.

5-1-2-8. MOTOR CONTROLLER (CRPHA, CRPHB, CRIA0, 1, CRIB0, 1, LFPHA, LFPHB, LFIA0, 1, LFIB0, 1)

MFP Controller (KS32C6200:U15) supports 2 stepper motors. It controls CR(Carriage Return) motor used to read and print documents and LF (Line Feed) motor used to feed and eject paper. CR motor controller can support 75, 150, 200, 300, 600, or 1200dpi according to resolution, while LF motor controller supports uni-polar and bi-polar according to the kind of motors. Though full step, half step and software control are possible for both, bi-polar CR motor is controlled half step and LF motor is controlled half step and quarter step here.

Page 9

Samsung Electronics 5-9

5-1-2-9. I/O PORT OF KS32C6200

PIN NAME

CIRCUIT NAME

I/O STATE DESCRIPTION

TXD 0 /GOP 0 LIU-TXD 0 - UART DATA TO I-LIU CHIP IN LIU

TXD 1 /GOP 1 - 0 - UNUSED

/EDACK /GOP 2 /XDACK 0

H DEFAULT STATE

L DMA ACKNOWLEDGE

TONE / GOP 3 KEYCLICK 0 - BEEP TONE

/RSTO / GOP 4 /RESET 0

H WATCHDOG RESET OUT IS INACTIVE

L WATCHDOG RESET OUT IS ACTIVE

/IOWR 1 / GOP 5 /FAULT-TEST 0

H DEFAULT STATE

L CHECK FAULT IN PRINTHEAD

/IOWR 2 / GOP 6 RX-CTL 0

H MODEM RX PATH CONNECTION

REMOTE START DETECTION PATH CONNECTION

/IORD 1 / GOP 7 /HEAD-EN 0

H PRINTHEAD IS DISABLE

L PRINTHEAD IS ENABLE

/IORD 2 / GOP 8 TONE-CTL 0

H MONITORING TX/RX SOUND

L BEEP SOUND

CLKOUT / GOP 9 IP-CLK 0 - CIP CLOCK

FIREPS / GOP 10 /RST-OUT 0

H EXT. CHIP IS ACTIVE

L EXT. CHIP IS RESET

/HSC / GOP 11 BIASOFF 0

H PRINTHEAD BIAS OFF

L PRINTHEAD BIAS ON

/HSM / GOP 12 CR-REF 0

H PRINT MODE IS LQ

L PRINT MODE IS DRAFT

Page 10

5-10 Samsung Electronics

PIN NAME

CIRCUIT NAME

I/O STATE DESCRIPTION

RXD 0 / GIP 0 LIU-RXD I - UART DATA FROM I-LIU CHIP IN LIU

RXD 1 / GIP 1 /P-EXIT I

H PAPER IS NOT DETECTED

L PAPER IS DETECTED

/EINT 1 / GIP 2 /MIRQ I

H NO INTERRUPT FROM MODEM

L INTERRUPT FROM MODEM

/EINT 2 / GIP 3 OK2PRINT I

H NO FAULT IN PRINTHEAD

L FAULT IN PRINTHEAD

/EDREQ / GIP 4 /XDREQ I

H NO DMA REQUEST FROM CIP

L DMA REQUEST FROM CIP

UCLK / GIP 5 HEAD-DATA I - CODE DATA FROM PRINTHEAD

TCK / GIOP 0 TCK I/O - TEST PIN FOR EMULATOR (CLOCK)

TMS / GIOP 1 TMS I/O - TEST PIN FOR EMULATOR (DATA MODE)

TDI / GIOP 2 TDI I/O -

TEST PIN FOR EMULATOR (DATA FROM EMULATOR)

/TRST / GIOP 3 /TRST I/O -

TEST PIN FOR EMULATOR (RESET TO TAP CON.)

TDO / GIOP 4 TDO I/O -

TEST PIN FOR EMULATOR (DATA TO EMULATOR)

Page 11

Samsung Electronics 5-11

As for SMARTJET there are 2 power resets of primary reset(/F-POR) and secondary reset(/POR) and also reset by watchdog timer (/RSTO). Primary reset is used to initialize flash memory when the system is turned on, while secondary reset is used to initialize the whole system by initializing MFP controller (KS32C6200) after primary reset. Primary reset makes flash memory wait in READ mode to fetch program codes, and secondary reset makes the main controller (KS53C6200) wake up and initialize external peripherals to operate the system. Fig.5-1-10 is Power Reset Timing Diagram.

5-1-2-10. RESET CIRCUIT

supply

Voltage

/F-POR

/POR

PnRST

Internal Reset

256 MCLK

Reset filter

65 MCLK

ROM Access

(internal)

Reset

Fig.5-1-10 POWER RESET TIMING DIAGRAM

Page 12

5-12 Samsung Electronics

¥ POWER MONITOR (U16: KIA7045F)

If +5V supplied to KIA7045F is so unstable as to reach +4.65V - +4.35V (typically 4.5V), it will recognize it as power failure. Then KIA7045F output terminal becomes low (0V) and the voltage is impressed to flash memory and KS32C6200, running RESET (LOW ACTIVE). Flash memory and KS32C6200 are reset first. Thereafter modem, print control parts and CIP(Color Image Processor) linked to /RST-OUT terminal of KS32C6200 are reset as well. KIA7045F output terminal of open drain structure is pulled up 5.1k½ and put out.

5-1-3 SYSTEM MEMORY

System memory consists of 512KB flash memory and 2MB DRAM. Flash memory and DRAM are selected by each CHIP SELECT (/ROMCS, /RASO, /RAS1, /LCAS, /UCAS), and data is accessed half word (16bits) by half word.

Page 13

Samsung Electronics 5-13

5-1-4 SCANNER

5-1-4-1. SUMMARY

This product has CCD(Charge Coupled Device) as an image sensor to receive image input signals and has embodied a shuttle scanner, realizing various scanner control signals and image processing with color image processor CIP1A(U17), which is ASIC for shuttle scan. We are going to look into the principles by explaining the whole data flow in the scanner, block diagram of CIP1A, allocated I/O port and peripheral circuits.

5-1-4-2. CIP1A(U17)

The inside of ASIC is roughly divided into A/D Converter to convert image signals to digital signals, Scanner Controller to provide various CCD driving signals and signals to interface with host controller, and Image Processor for shading compensation, gamma compensation and reasoning of image signals.

CCD

Module

CIP-1A

A/D

Converter

Scanner

Controller

MFP

Controller

Image

Processor

Data

Memory

Analog

Data

CCD

Control

Pixel Data

Digitized

Data

DMA

Control

System

Data BUS

Data

Timing

Control

CIP-I Control Data

Formatted Data for DMA

CIP-I Control Data

Processed

Data

A/D

Sample

Clock

fig.5-1-11 CIP1ABlock Diagram

Page 14

5-14 Samsung Electronics

PIN PIN

I/O

CIRCUIT DESCRIPTION

NAME NO. NAME

GIP 0 12 I /START-KEY -

FAX START / COPY KEY

PRESSED

GIP 1 13 I /CART-KEY -

CARTRIDGE CHANGE KEY

PRESSED

GIP 2 14 I /POW-KEY -

POWER(READY) KEY

PRESSED

GIP 3 15 I /STOP-KEY -

FORM FEED / STOP KEY

PRESSED

GIP 4 17 I THMST CCD LAMP OVER HEAT CCD LAMP NORMAL

GIP 5 18 I /RINGDET -

RING DETECTION FROM

TEL LINE

GIP 6 19 I /HOOK-OFF EXTERNAL PHONE HOOK ON

EXTERNAL PHONE HOOK OFF

GIP 7 20 I HOME-SEN PRINT HEAD PARKING PRINT HEAD MOVING

GOP 0 2 O SHAD-ON SHADING ENABLE -

GOP 1 3 O /SHAD-RST

SHADING REFERENCE CLEAR

GOP 2 4 O POW-LED POWER (READY) LED ON POWER(READY) LED OFF

GOP 3 5 O BUSY-LED BUSY LED ON BUSY LED OFF

GOP 4 7 O SCAN-LED FAX LED ON FAX LED OFF

GOP 5 8 O CML-CTL

FAX OR TEL LINE CONNECTED

EXT. PHONE CONNECTED

GOP 6 9 O LAMP-5V CCD MODULE RETURN (+5V) -

GOP 7 10 O LAMP-12V CCD LAMP ON (+11.75V) -

5-1-4-3 CIP1A I/O Port

Page 15

Samsung Electronics 5-15

PIN PIN

I/O

CIRCUIT DESCRIPTION

NAME NO. NAME

GIOP 0 21 O THM-CLK CLOCK SIGNAL TO DIGITAL THERMISTER : 100~140kHz

GIOP 1 22 I/O THM-DATA DATA FROM/TO DIGITAL THERMISTER

GIOP 2 23 O PRE-HEAT PRINT HEAD PREHEATING -

GIOP 3 24 I P-EMPTY NO PAPER PAPER READY

GIOP 4 25 O /SPK-CTL AUDIO AMP. OFF AUDIO AMP. ON

GIOP 5 26 O FAX-LED FAX LED ON FAX LED OFF

GIOP 6 27 I FM-STAT

FLASH MEMORY STATUS FLASH MEMORY STA

TUS

READY BUSY

GIOP 7 28 O CLK-SEL MCLK/2 MCLK

5-1-4-4. PERIPHERAL CIRCUIT

As to the power of lamp, light source of the scanner module, +11.75V(while scanning) supply and +5V(while waiting) supply are switched by transistor Q7,8,9, and 11.

-Vref is supplied with 1.5V by resistance division through OP-Amp, while +Vref detects the peak by control of analog Mux U2 during white reference label shading. It detects the peak level of image signals by dividing shad-on signal and /Shad-rst signal of U2 into High, setting it as top standard voltage. When you scan some image actually, it will drive shad-on signals into Low to keep the peak level of the capacitor. When you finish scanning, it will drive /Shad-rst into Low and discharge electricity. Image signals from CCD mounted on scan PBA in the shuttle scanner are delivered through FPC cable, shifting the level as much as 0.75V at Emitter terminal of Tr which is turned on by Level SH signal. These image signals will double by an non-inverting amplifier and finally 1.5V level-shifted image signals will be put in CIP1A.

Page 16

5-16 Samsung Electronics

5-1-5 PRINTER

5-1-5-1. GENERAL

It drives inkjet head to print printing data received from the computer or fax data coming through the line. It roughly consists of head driver, head controller, and the ambient temperature sensor. Fig.6-1-11. Block Diagram of Printer shows the entire structure.

5-1-5-2. HEAD DRIVER (U19, U20, U23, U24)

This part drives and inks inkjet head. Color inkjet head drives 192 nozzles, while mono inkjet head drives 208 nozzles. Mono inkjet head is composed of 16 groups of 13 nozzles. As to the driver that composes each nozzle, 13 row 7-bit driver (U23, U24) selects head address and 16 column 8-bit driver (U19, U20) sends head data. Head driver converts control signals from MFP controller to +11.75V, the level to be able to drive the head, and provides them for the inkjet head.

¥ Row Driver Circuit (HD7:U23:U24)

This is a 13-line signal impressed to row drive IC through the output port of MFP controller(/PHGA1 - /PHGA13), used as an address to drive the head in ink cartridge. Pulse period differs according to head driving frequency. In 1200dpi (in case of Head: 12KHz) mode, timing period is 2.6usec (1/1200Ö16 groups). The signal put in each driver(window time) is active ÒLÓ, with the biggest driver current max 100mA and output voltage +11.75V.

¥ Column Driver Circuit (HD8:U19,U20)

It is the fire enable pulse of real head. 16 lines are put out as head driving data lines through the output port of MFP controller (PHOE1 - PHOE16). Enable pulse impressed to the head is put out within window time (Low). It has the function to move it forward or backward by the register in MFP controller. Besides the output signal may differ in accordance with the type of head (mono or color). If there is data, printing image is put out at ÒHÓ. If not, it is put out at ÒLÓ. In case of Babbage head, pulse width is always 1.3use regardless of the type of the head, with the maximum driving current 400mA and output voltage +11.75V.

Page 17

Samsung Electronics 5-17

5-1-5-3. HEAD CONTROLLER

This part consists of +22V Power Controller to control head driver, Fault Test, Head Detection, Substrate Heating and ambient Temperature Sensor. It checks and controls head driver and ink cartridge.

KS32C6200

(U15)

Ink

Cartridge

(Mono)

(Color)

MFP

CONTROLLER

CIP 1A(U17)

IMAGE

PROCESSOR

/FAULT-TEST

/HGA1

/HGA13

HOE1

HOE16

/FAULT-TEST

OK2PRINT

BIASOFF

HEAD-DATA

/HEAD-EN

PRE-HEAT

BH1,BH2

HSM

BS1

THM-DATA

THM-CLK

BP1

BA13

BA1

BP16

/FAULT

HEAD-DATA

Fig.5-1-12 Block Diagram of Printer

Page 18

5-18 Samsung Electronics

¥ +22V Power Controller

If you insert power cords, the main board will be supplied with power. /POR signal put out through reset circuit activates MFP controller (K32C6200:U15) and MFP controller puts out external circuit reset signal /RST-OUT. This /RST-OUT signal and Vrefx (+2.5V) divided through +30V are impressed to the input terminal of the comparator, putting out +22V if the output of the comparator is ÒhighÓ or getting turned off if ÒlowÓ.(in case of /FAULT-TEST signal: HIGH) While +22V is being impressed after /RST-OUT is ÒHighÓ, comparator output gets ÒlowÓ and turns off +22V driving TR(TIP112) if /FAULT-TEST signal is put out at ÒlowÓ when you check a short of the head driver and the ink cartridge (head).

¥ FAULT TEST CIRCUIT

This is a signal to detect whether the head receiving the output of head column driver is in a short. After /FAULT-TEST signal is put out at ÒlowÓ and +22V is turned ÒoffÓ, ÒOK2PRINTÓ signal is entered. The port of KS32C6200(U15) shows normal condition if ÒHÓ and a short if ÒLÓ. If you make FAULT-TEST output ÒLÓ to detect fault of the head, +22V gets off. If the head is in a short (LOW), when the level of Ò/FAULT-TESTÓ signal goes ÒLÓ and final ÒOK2PRINTÓ output goes ÒLÓ. KS32C6200(U15) reads this signal and checks whether the head input receiving the driver output is in a short. Diode cathode is attached to each output transistor collector in the column driver. 8 anode terminals of diode become common as one and put out /FAULT signal, which is pulled up by bias circuit controlled by /FAULT-TEST and shows the condition by OK2PRINT through the comparator.

¥ SUBSTRATE HEAT CIRCUIT

Mono ink cartridge of Babbage head is 600dpi head that uses pigment ink. It is very sensitive to the temperature in and around the cartridge. In particular, the viscosity of ink affects print quality as it is inversely proportional to temperature by an exponential function. This signal used to compensate it helps you get equal inking quality by warming the ink chamber in the cartridge with aluminum pattern heater before starting to print if the surrounding temperature is lower than standard (below 35¡É).(Refer to Timing Chart.) It sends PRE-HEAT signal through I/O port of CIP1A(Color Image Processor:U17) and supplies +11.75V.

Mono Head

Fig.5-1-13. Temperature around Mono Head

Pre-Heat if below 35¡c

70°C

35°C

Page 19

Samsung Electronics 5-19

Color Head

Fig.5-1-14. Temperature around Color Head

Fig.5-1-15. HEAD DETECTION TIMING DIAGRAM

No Pre-Heating

¥ HEAD DETECTION CIRCUIT

Babbage ink cartridge has 8-bit mask ROM I.D. to check the type of cartridge. In order to detect the head, HSM signal is used as ENABLE signal and BA3 signal as START & STOP BIT, and BA1 and BA2 as clock signal of each bit, and ID signal in the cartridge is put in HEAD-DATA port of KS32C6200 through BS1 line. With each bit controlled, 8bit I.D data is read and STOP bit is put out of BA3(LOAD) port. Then it finishes. If data is mono, it is 07H. If color, 08H.

70°C

HSM

(Pwr)

BA3

(Load)

BA1

(Clock1)

BA2

(Clock2)

HEAD-DATA

bit7

Head I.D read : HEAD-DATA

Mono : 07H Color : 08H

Min 500ns Clock Delay

bit6 bit5 bit4 bit3 bit2 bit1 bit0

Page 20

5-20 Samsung Electronics

¥ SURROUNDING TEMPERATURE SENSOR

DS1621S(DALLAS SEMI.) is applied to read the temperature around ink cartridge. It is used to get optimum inking quality by keeping the viscosity of ink in the cartridge in the specified lerel. The way to read temperature is similar to EEPROM, controlled by THM-CLK, THM-DATA LINE. Digital thermometer to check the surrounding temperature is assembled along with home sensor in the frame of assembly CR. After each line is printed, it reads the surrounding temperature and heats substrate heater in the ink cartridge during the accelerating time of CR to keep the viscosity of ink in the specified lerel.

5-1-5-4. HEAD DRIVING TIMING

Control signal from MFP controller (KS32C6200:U15) enters the head driver and it becomes the level to be able to drive the head nozzles (+11.75V). It is depicted in the following diagram.

Signal

p(PD)

Signal

Pre-Heat Pulse Width Fire Pulse Width

Fire Enable Timer

Pre-Heat Delay Width

Front End Delay

Back End Delay

Fig.5-1-16. HEAD DRIVING TIMING DIAGRAM

Page 21

Samsung Electronics 5-21

HSM

BA1 BA2

BA3 BA4

BA5 BA6

BA7 BA8 BA9

BA10 BA11

BA12 BA13

(Tp)

BP1-

BP16

Fig.5-1-17. TIMING DIAGRAM FOR EACH NOZZLE

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5-22 Samsung Electronics

5-1-5-5. INK CARTRIDGE

¥ PIN ARRAY OF MONO INK CARTRIDGE

There are 208 heater chips in mono ink cartridge.

Column

Address (BA1_ ~ BA13_)

Data(BPx)

12345678910111213

1 1 21 15 9 3 23 17 11 5 25 19 13 7

2 20 14 8 2 22 16 10 4 24 18 12 6 26

3 2747413529 494337 3152 453933

4 4640342849 423630 5044 383252

5 5373676155 756963 5777 716559

6 7266605474 686256 7670 645878

7 79 99 93 87 81 101 95 89 83 103 97 91 85

8 98 92 86 80 100 94 88 82 102 96 90 84 104

9 105 125 119 113 107 127 121 115 109 129 123 117 111

10 124 118 112 106 126 120 114 108 128 122 116 110 130

11 131 151 145 139 133 153 147 141 135 155 149 143 137

12 150 144 138 132 152 146 140 134 154 148 142 136 156

13 157 177 171 165 159 179 173 167 161 181 175 169 163

14 176 170 164 158 178 172 166 160 180 174 168 162 182

15 183 203 197 191 185 205 199 193 187 207 201 195 189

16 202 196 190 184 204 198 192 186 206 200 194 188 208

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Samsung Electronics 5-23

¥ PIN ARRAY OF COLOR INK CARTRIDGE

There are 192 heater chips in mono ink cartridge. One cartridge has 64 Cyan, 64 Magenta, 64 Yellow heaters and (64 x 3 colors) 192 nozzles.

Column

Address (BA1_ ~ BA13_)

Data(BPx)

12345678910111213

1 - 19 13 7 11 21 15 9 3 23 17 11 5

215126-201482221610424

3 2545393327 474135 2949 433731

4 4438322646 403428 4842 363050

5 5171655953 736761 5575 696357

6 7064585272 666054 7468 625676

7 77 97 91 85 79 99 93 87 81 101 95 89 83

8 96 90 84 78 98 92 86 80 100 94 88 82 102

9 103 123 117 111 105 125 119 113 107 127 121 115 109

10 122 166 110 104 124 118 112 106 126 120 114 108 128

11 129 149 143 137 131 151 145 139 133 153 147 141 135

12 148 142 136 130 150 144 138 132 152 146 140 134 154

13 155 175 169 163 157 177 171 165 159 179 173 167 161

14 174 168 162 156 176 170 164 158 178 172 166 160 180

15 181 - - 189 183 - - 191 185 - - - 187

16 - - 188 182 - - 190 184 - - 192 186 -

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5-24 Samsung Electronics

5-1-6 MOTOR DRIVER

5-1-6-1. GENERAL

SMARTJET use 2 stepper motors, i.e. CR(Cartridge Return) motor and LF(Line Feed) motor. CR motor moves left and right all-in-one carriage of inkjet head and shuttle scanner. It helps the printer print accurately on the paper and the scanner read image data accurately. LF motor is driven to feed and eject paper for printing and to feed and eject documents to read for scanning. Bi-polar CR motor is controlled half step with maximum 24ips(inch/sec), while LF motor half step and quarter step at maximum 6ips.

5-1-6-2. CR(CARRIAGE RETURN) MOTOR DRIVING CIRCUIT

CR motor moves the carriage left and right when ink cartridge prints something on paper or shuttle scanner reads image data.

- Motor Type : Stepper motor, bi-polar

- Driving Voltage : +30V

- Winding Resistance : 6½ ± 10%

- Driving IC : TEA3718DP X 2

CR_REF

CRIA1 CRIA0

CURRENT(mA) OPERATION REMARK

(CRIB1) (CRIB0)

H L L 490 Mono LQ is being driven

L L L 670 Color draft is being driven

L L L 670 Mono draft is being driven

X H H 0 No current

As shown in the above table, current in each mode is adjusted by voltage of driver(U25, U26) CRVREF input. If the output of CR_REF signal controlled by MFP controller(U15) is ÒlowÓ, TR(Q12) will be turned off and the voltage put in to CRVREF of driver (U25, U26) with +5V divided will go up (+4.5V). It becomes the standard of the driver, resulting in high current. If CR_REF output is ÒhighÓ, TR(Q12) will be turned on and the voltage put in to CRVREF will go down (+3.0V), resulting in low current in the motor.

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Samsung Electronics 5-25

5-1-6-3. LF(Line Feed) Motor Driving Circuit

LF motor is driven to feed and eject documents and paper.

- Motor Type: stepper motor, bi-polar

- Driving Voltage : +30V

- Winding Resistance : 12½ ± 10%

- Driving IC : PBL3717A X 2

LFIA1 LFIA0 CURRENT(mA) OPERATION REMARK

L L 670 When feeding document/paper

L H 400 When ejecting document/paper

X H 0 No current

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5-26 Samsung Electronics

5-1-7 FAX TRANSCEIVER

5-1-7-1. GENERAL

This circuit processes transmission signals of modem and between LIU and modem. This circuit is added only to SMARTJET.

5-1-7-2. MODEM (U21)

KS16116 is a single chip fax modem. It has functions of DTMF detection and DTMF signal production as well as functions of modem. TX OUT is transmission output port and RX IN is received data input port. /POR signal controlled by MFP controller (U15:KS32C6200) can initialize modem(/RST_OUT) without turning off the system. D0 - D7 are 8-bit data buses. RS0 - RS4 signals to select the register in modem decide the mode. /CS is a signal to select modem chips. /RD and /WR signals control READ and WRITE respectively. /IRQ is a signal for modem interrupt. Transmission speed of KS16116 is up to 9600bps.

5-1-7-3. TRANSMITTER

This circuit processes transmission output, analog signal of modem(KS16116). Output signal in each mode goes out of modem (TXOUT:U21-44). After D/A signals are smoothed and filtered through active filter (U5-6,7:R270,R277,C130), they are buffered under OP AMP(U5-2, 1:R291, C139, R298, C150) and put out to LINE through LIU board.

5-1-7-4. RECEIVER

In the receiving mode, analog signals coming in through LIU board are amplified at OP AMP(U6-2, R293, C141), and then transmitted to input terminal of modem (RXIN:U21-45) through smoothing filter (U6-6, 7:R273, R274, C126).

Fig.5-1-18. FAX TRANSCEIVER

FAX TRANSMISSION

FAX RECEPTION

MODEM

KS16116

(U21)

LIU

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Samsung Electronics 5-27

5-1-8 OTHERS

OPERATOR PANEL DESCRIPTION

KEY & LED DESCRIPTION

- When power cord is inserted, the system is turned on and initialized. It does not operate but waits for Ready key to be pressed.

- If you press the Ready key, the nearby Ready LED will be turned on and the device will be initialized with the system in standby mode.

- If the Ready LED is off, the system does not operate though it is on.

- Running Print Out Test Pattern

Step 1. While Ready LED is off, press ÔReadyÕ key for 0.5 - 1 second with ÔFF/Stop key pressed

in advance.

Step 2. Pattern is printed so that you can check the nozzles of the head.

- This key is used to exchange print head cartridge in the toggle mode or to insert it for the first time.

- If color head is mounted when fax documents are to be printed,it does not print but Ready LED and operating LED blink.

- Press this key for about 3 sec or more to put in a new ink cartridge.

- When Ôno paperÕ is displayed while printing, place paper, and it is automatically fed.

- After you finish printing, press this key to eject paper already fed.

- Press this key to stop fax communication.

- Press this key to stop scanning.

- If you press this key when hook-on and documents will be fed, scanned and stored in memory.

- If you press this key when hook-on but there is no document, LED meaning ÔFeed documentÕ will blink for about 3 sec. (Refer to LED status.)

- If you press this key when hook-off, it will operate to receive or transmit the document you fed.

LED status

System Standby Mode. You can start new operation only in this mode. (TEL mode) System Standby Mode. You can start new operation only in this mode. (FAX mode) Data is being received from host.(Printing) other operation Data is being uploaded to host. (Scanning) Fax transmitting/reception. (Faxing) Transmitting/receiving error Paper jam, no paper No document, next document, document jam Cartridge is being exchanged. No cartridge Ink low

● ➞ green LED ON ➞ OFF ➞ green LED blinks

■ ➞ red LED ON ➞ red LED blinks

Ready Busy Scan/Fax

●

■

Ready Cartridge FF/Stop Start/Copy

Busy Scan/Fax

Ready

Cartridge

FF/Stop

Start/ Copy

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5-28 Samsung Electronics

5-2-1 SUMMARY

LIU(Line Interface Unit) circuit added only to SMARTJET is controlled by the main circuit. It monitors telephone line and helps interface between the system and the telephone line. It uses 1LIU(STI9510) to control the whole LIU, MODEM/LINE INTERFACE, RING SIGNAL DETECTOR, DIALER, LINE CURRENT DETECTOR, and SERIAL INTERFACE.

5-2-2 MODEM/LINE INTERFACE

This is the path through which transmitted and received data of modem is put in and out. ¥ CML1 Relay: It divides telephone line into external telephone and fax. ¥ U3-3 TIT(Transformer Input from Transformer): This single ended input receives image signals from

modem through transformer T2 and transmits them on telephone line.

¥ U3-40 ROT(Receive Output Transformer): This output transformer receives signals on telephone line and

delivers them to modem through transformer T1. It has AC impedance of 10Kohm or over.

¥ AC impedance: Normal operation range of U3(STI9510) is from 15mA to 100mA. DC characteristics depend

on the voltage of U3-37 LI(Line Input) terminal and the voltage of resistance R48 between U3-37 LI(Line Input) terminal and U3-39 LS terminal.

5-2-3 RING SIGNAL DETECTOR

¥ U3-28(MO) terminals are ring signal output terminals. Q4 and Q5 put out ring signals and drive Piezzo, but

SmartJet2000, SMARTJET does not use Piezzo. It has only the functions related to ring detection such as driving the photocoupler of U4 and delivering ring signals to MFP controller (U15:KS32C6200) of the main.

5-2-4 DIALER

5-2-4-1. MF DIAL

¥ Default mode it is set in DP. You can change it to MF mode by control of MFP controller. ¥ MF signal can be measured at (tone level of low group: typical - 14dBm) U3-4 MFO(DTMF Generator

Output). The signal is adjustable by R40, R41 and C29. The adjusted signal enters U3-9 MFI (DTMF Amplifier Input) and is amplified to be transmitted on telephone line.

¥ U3-39 LS(Line Current Sense Input) terminals show the final signals transmitted to telephone line.

5-2-4-2. DP DIAL

¥ If U3-2(DMS) is made Vcc by R42, it is set at 33:67 DP signal. If it is made Vss by R43, it is set at DP signal.

This product is set at DP signal.

¥ DP signal is made by U3-27(DPn) terminals. This signal turns on/off Q1. The signal made at that time turns

on/off Q2, which interrupts DC current on telephone line and puts out pulse signal on telephone line.

¥ U3-35 CS terminals : It makes Make Resistance by shorting telephone line with Vss during Make period of

DP dial.

5-2 LIU PBA

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Samsung Electronics 5-29

5-2-5 Line Current Detector

¥ When CML1 relay connects telephone line, U3(STI9510) of LIU board and MFP controller of the main board

(U15:KS32C6200) start communication through UART. U3 of LIU board sends signal that includes information of line current value, whenever it receives orders or data from U15 of the main board.

5-2-6 Serial Interface

¥ This part does serial communication with MFP controller of the main board (MAIN PBA:U15) that controls

the whole system. It controls LIU by giving and taking all control orders and line status. ¥ U3-11 RXD : Schmitt Trigger input, Receiving terminal.. ¥ U3-29 TXD : Open Drain output terminal ¥ Standard UART communication

- Baud Rate : 9600bps

- Start, Stop bit : 1bit each

- Data bits : 8 bit

- Parity bit : none

5-2-7 MAJOR FUNCTIONS OF PARTS

1) U3 : STI9510

- Key part of LIU board. Speech Network, Dialer, Ringer and UART are built in one IC package.

2) U5 : PC817

- Photo coupler. It enables UART of U3(STI9510) to receive control signal or dialing information from MFP controller of the main board (U15).