Samsung SF 4700 Circuit Description

Samsung Electronics

5-1

5. List Abbreviations

Acrynym Definition

MFP MULTI FUNCTION Peripheral
I/F INTERFACE
UART Universal Asynchronous Receiver/Transmitter
ECP Extended Capabilities Port
CR CARRIAGE RETURN
LF LINE FEED
SCANIP SCAN IMAGE PROCESSOR
CIS CONTACT IMAGE SENSOR
A/D ANALOG TO DIGITAL
D/A DIGIT ALTO ANALOG
LIU Line Interface Unit
TIT Transformer Input from Transformer
ROT Receive Output Transformer
LI Line Input

Samsung Electronics

6-1

6. Circuit

6-1 SF-4750C Main PBA

6-1-1 Summary

The main circuit that consists of CPU, MFP
controller (built-in 32bit 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.6-1-1. Entire Structure of Main Circuit for Each Key Signal

OPE-TXD

MA0~MA14

/WE

/OE
MD0~MD7

TMIA1

TMIA0
TMIB0

TMIB1

OK2PRINT
/P_EXIT
/RING_DET

/HOOK_OFF

CIS_CLK
CIS_SH

/SPK_CTL

PREHEAT

_M

PREHEAT

_C

CIS-SIG

VREFADC
VREFDAC

VOL0
VOL1
VOL2

CML_ON

/DRAM_EN

ICML1

GLED
RLED
BLED

OPE-RXD

MCLK(38MHz)
/POR

/ROMCS

/RD, /WR

D0~D15

D0~D15

D0~D7

A0~A17

A0~A9

A0~A4

/MODEM-RST

/USB-RST

/USB-CS

/USB-XDDCK

/USB-XDREQ

/USB-INT

/MCS

/MIRQ

/RD, /WR

/RASO

/WR

/UCAS,

/LCAS

/F-POR

MORK(38MHz)

/XDACK
/XDREQ

/IP-CS

/RD, /WR

D0~D15

A0~A5

/TX-INT

LFPHA

MFP

CONTROLLER

(KS32C6400)

LFPHB

LFIA0
LFIA1
LFIB0
LFIB1

DIR

PWM

CHX
CHY

/HEAD-EN

/HGA1~/HGA13

HOE1~HOE16

/FAULT-TEST

BIASOFF

/RST-OUT

/RST-OUT

FLASH

MEMORY

(4M bit)

DRAM

(16M bit)

MODEM

SCAN

IMAGE

PROCESSOR

LF MOTOR

DRIVER

SRAM

CIS

CR MOTOR

DRIVER

CR

EN CORDER

PRINT HEAD

DRIVER &

PRINT

CONTROL/

CIRCUIT

OPE

TX MOTOR

DRIVER

/OPE-RST

C_HEAD DATA

Backup

Power

USB

Controller

VBUS
USBDP
USBDM

PULLUP

VB

48MHz CLK

Samsung Electronics

6-2

6-1-2 MFP Controller (KS32C6400 : U26

MFP Controller consists of CPU(ARM7TDMI RISC
processor), 4K-byte cache, data and address buses,
serial communication part with OPE(OPERATION
PANEL) print head controller, USB interface, external
DMA part to receive data from external color image
processor (SCANIP), LF/CR motor diver
controller and I/O controller.

6-1-2-1. SYSTEM CLOCK

The internal clock frequency is 38MHz. 38MHz
system clock (MCLK) supplied from the outside is
used without being divided inside.

6-1-2-2. DATA& ADDRESS BUS CONTROL

• /RD & /WR
/RD & /WR signals are synchronized with
MCLK(38MHz) 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, USB,
MODEM and the outside devices and becomes
active.

• CHIP SELECT (/IP_CS, /ROMCS, /USB_CS,
/MCS)

- /IP-CS : SCANIP(U29) CHIP SELECT (LOW

ACTIVE)

- /ROMCS : ROM/FLASH MEMORY(U31) CHIP

SELECT (LOW ACTIVE)

- /USB_CS : USB (U43) CHIP SELECT (LOW

ACTIVE)

- /MCS : MODEM(U37) 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.)

Circuit

Samsung Electronics

6-3

6-1-2-3. OPE Serial Communication Part

UART (Universal Asynchronous
Receiver/Transmitter) at KS32C6400 enables the main
and OPE to transmit serial

data. The block diagram of UART is as follows: (Fig.6­1-2) KS32C6400 has 2 UART channels. The baud rate
is 9600bps.

Circuit

TxD

TxD

RxD

IRS

RE

IR Tx

Encoder

IR Rx

Decoder

0

0

1

1

RxD

UART

Block

Fig.6-1-2. 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.6-1-3 UART DATA FORMAT

Samsung Electronics

6-4

6-1-2-4. EXTERNAL DMA BLOCK

It brings data from external devices (SCANIP:U29 ,
USB:U43) using DMA channel 0,1. DMA REQUEST
sent from an external device to KS32C6400 activates
DMAACKNOWLEDGE signal and drives DMA
channel 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.

Circuit

MCLK

/XDREQ

/XDACK

D[15:0]

/RD

/WR

Fig.6-1-4 EXTERNAL DMA TIMING DIAGRAM

Samsung Electronics

6-5

6-1-2-5. DRAM CONTROLLER

As KS32C6400 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, two (2) of 512
Kbytes are
connected for this product.

Circuit

Samsung Electronics

6-6

6-1-2-6. INKJET HEAD CONTROLLER

This part produces major control signals used to drive
INKJET head. It consists of signals to drive head noz­zles, /HGA[13:1], HOE[16:1], /FAULT-TEST, /HEAD­EN, and BIASOFF, and consists of signals to check the
status of the head, HEAD-DATA.

It has double height print head, system 208 nozzles
for mono and 192 nozzles for color, and uses
/HGA[13:1], HOE[16:1] signals and /HEAD-EN to
drive these nozzles. Fig.5-1-8 is timing diagram of
each signal.

/HGA

Signal

HOE

Signal

Fire Enable Timer

Pre-Heat Pulse Width

Front End Delay Back End DelayPr-Heat Delay Width

Fire Pulse Width

t

p (PD)

Fig.6-1-5 Timing Diagram to Drive Head

Circuit

Samsung Electronics

6-7

Circuit

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.

6-1-2-7. PRINTER MOTOR CONTROLLER (CRPHA,

CRPHB, CRIA0, 1, CRIB0, 1, LFPHA, LFPHB,
LFIA0, 1, LFIB0, 1)

MFP Controller (KS32C6400:U26) supports both DC
motor and stepper motor. It controls CR (Carriage
Return) motor used to 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, CR
motor is controlled DC control block and LF motor is
controlled half step and quarter step here.

/HEAD-EN

/HGA1
/HGA2

/HGA3
/HGA4

/HGA5
/HGA6

/HGA7
/HGA8
/HGA9

/HGA10
/HGA11

/HGA12
/HGA13

(Tp)

HOE1-

HOE16

Fig.6-1-6. Timing Diagram for Each Nozzle

Samsung Electronics

6-8

6-1-2-8. I/O PORT FOR KS32C6400

PIN NAME

PIN NO

I/O PORT NAME

DESCRIPTION FOR STATE

GOP0/TXD1
GOP1/TXD2
GOP2/nEDACK
GOP3/TONE
GOP4/nRST0
GOP5/nIOWR1
GOP6/nIOWR2
GOP7/nIORD1
GOP8/DRV–SDO
GOP9/CLKOUT
GOP10/FIRE­PULSE
GOP1 1/nHSC
GOP12/nEDACK
2
GOP13/nECS3
GIP0/nRXD1
GIP1/nRXD2
GIP2/nEINT1
GIP3/nEINT2
GIP4/nEDREQ
GIP5/UCLK
GIP6/nEWT3
GIOP0/TCK
GIOP1/TMS
GIOP2/TDI
GIOP3/nTRST
GIOP4/TDO
GIOP5
GIOP6
GIOP7/nWAIT

121
123
138
148
149
133
154
155
152
151
150
153
128

42
122
124
135
136
137
127

41
126
125
120
116
115
103

38

31
145
146

DP

OPE_TXD

/XDACK

KEYCLICK

WATCHDOG

/FAULT_TEST

/OPE_RST

BIASOFF

/RST_OUT

CLK_OUT

TONE_CTL
/C_HEAD_EN
/USB_XDACK

RESERVED
RESERVED

OPE_RXD

/MIRQ

TX_INT

/XDREQ

/USB_XDREQ

/USB_INT

TCK
TMS

TDI

/TRST

TDO

/MODEM_RST

RECALL

/M_HEAD_EN

/USB_RST

RX_CTL

DIAL PULSE ON

DIAL PULSE OFF:IDLE STAT

SERIAL DATA FROM KS32C6400 TO OPE MICOM

–

DMAACKNOWLEDGE TO SCAN IP

KEYCLICK TONE

WATCHDOG RESET OFF WATCHDOG RESET

– TEST PRINT HEAD FAULT

OPE RESET OFF OPE RESET

PRINT HEAD BIAS OFF PRINT HEAD BIAS ON

RESET OFF RESET ON

OUTPUT WITH 38.00053MHz

LINE MONITORING KEYCLICK

DISABLE COLOR PRINT HEAD ENABLE COLOR PRINT HEAD

IDLE

DMAACKNOWLEDGE TO USB IC
NC NC
NC NC

SERIAL DATA FROM OPE MICOM TO KS32C6400

MODEM INTERRUPT INACTIVE MODEM INTERRUPT ACTIVE

IDLE TX MOTOR INTERUPT
IDLE

DMA REQUEST FROM SCAN IP

IDLE DMAREQUEST FROM USB IC

IDLE INTERUPT SIGNAL FROM USB IC
RESERVED TEST PIN for ICE(JTAG)
RESERVED TEST PIN for ICE(JTAG)
RESERVED TEST PIN for ICE(JTAG)
RESERVED TEST PIN for ICE(JTAG)
RESERVED TEST PIN for ICE(JTAG)

RESET OFF RESET ON
RECALL ON RECALL OFF:IDLE STATE

DISABLE MONO PRINT HEAD ENABLE MONO PRINT HEAD

RESET OFF:IDLE STATE RESET ON

RX LINE TX LINE OR REMOTE

O
O
O
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O

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H L

Circuit

Samsung Electronics

6-9

Circuit

6-1-2-9. RESET CIRCUIT

As for this product, 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
(KS32C6400) after primary

reset. Primary reset makes flash memory wait in
READ mode to fetch program
codes, and secondary reset makes the main
controller (KS32C6400) wake up and initialize
external peripherals to operate the system.
Fig.5-1-10 is Power Reset Timing Diagram.

• POWER MONITOR (U220: XC61FN4512)
If +5V supplied to XC61FN4512 is so unstable as to
reach +4.65V - +4.35V (typically 4.5V), it will
recognize it as power failure. Then XC61FN4512
output terminal becomes low (0V) and the voltage is
impressed to flash memory and KS32C6400, run­ning RESET (LOW ACTIVE). Flash memory and

KS32C6400 are reset first. Thereafter modem,USB,
print control parts and SCANIP(Color Image
Processor) linked to /RSTOUT terminal of
KS32C6400 are reset as well. XC61FN4512 output
terminal of open drain structure is pulled up 1MΩ
and put out.

supply

Voltage

/F-POR

/POR

PnRST

Internal Reset

256 MCLK

Reset filter

65 MCLK

ROM Access

(internal)

Reset

Fig.6-1-7 POWER RESET TIMING DIAGRAM

Samsung Electronics

6-10

6-1-3 System Memory

System memory consists of 4M bit flash memory, and
16M bit DRAM, Flash memory, DRAM are selected by
each CHIP SELECT (/ROMCS, /RAS0, /RAS1,
/LCAS, /UCAS), and data is accessed half word
(16bits) by half word.

DRAM structure is designed to add additional 2MB to
the basic 2MB as buyers can make their options.
In addition, the backup circuit built in for DRAM
15seconds keeps data in user memory during at least
power failure. Capacitor (1000µF)
(1F) is used as a backup element. Flash memory holds
telephone numbers and journal information.

6-1-4 Scanner

6-1-4-1. SUMMARY
This sheet-fed type device to read manuscripts has

300dpi CIS as an image sensor. The design is focused
on 15-sheet ADF.

6-1-4-2. SCAN RESOLUTION
– Normal : 1/3.85mm, 1/8mm (98 u 203dpi)

– Fine : minor scanning 1/7/7mm, main

scanning 1/8mm (196 u 203dpi)

– Super Fine : minor scanning 1/300inch, main

scanning 1/300inch(300 u 3000dpi)

6-1-4-3. CIS : Contact Image Sensor improves
productivity and is designed to be replaced easily.

A1000 model uses color CIS.

– Minimum Scan Line Time for one color : 2.5mS
– Color Separation : RGB LED transfer mode
– Light Source Power : 5V
– Maximum Pixel frequency : 2MHz
– Effective Sensor Element : 2552
– Bright Output : MIN 0.3V

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

IP

Control

+

Formatted Data for DMA

SCANIP Control Data

Processed

Data

A/D

Sample

Clock

Fig.6-1-8 SCANIP Block Diagram

CIS

CIS
Control

Circuit

Samsung Electronics

6-11

Circuit

6-1-4-4. IMAGE PROCESSING

1) Image signal input: CIS output signals are offset at

0~1.3V .
So OP AMP is used to design
interface circuit of SCANIP.

2) Image processing : The scanner reads pixel data
value of image sensor CIS(Contact Image Sensor)
300dpi lines by 300dpi lines, and stores it in scan
buffer through TIP algorithm if Normal is
selected for Image Processor SCANIP, through
Error Diffusion algorithm if medium, or through
DMA without algorithm if PC Scan mode.
Commonly for all the three modes, it is processed
after shading correction and gamma correction. 5u5
Window Processing begins after data is stored in
32K Byte external SRAM (U34).

Image Processor SCANIP has the following
specifications:

a Package: 128 Pin QFP
b Operating Frequency: 25 - 40MHz
c Minimum Scan Line Time: 1.5mS
d Scan Resolution: Max. 300DPI
e Scan Width: B4
f Major functions

– Internal 8bit ADC
– Black/White shading correction for each color

R.G.B
– Gamma correction for each color R.G.B
– Mono CIS (Canon, Dyna) interface
– Color CIS (Canon, Dyna, Toshiba) interface
– Automatic Motor Control
– Image Processing Mode : TIP, Ordered dither,

Error diffusion
– 256 Gray Scale
– AGC function
– PC Gray Scan function

g External SRAM: 32Kbyte, 15Ns Access Time

3) CIS LED Driver: LED in CIS is on with +5V. TR cir­cuit is built in to drive this LED.

– Maximum LED current: 300mA

4) PC Scan function

– Resolution(VuH) : 300u300/75u75dpi

(Pre-scanning mode)
196u203/98u203dpi

– Mono Bit Depth : 8bits Gray Scan/1bit Text

Scan/1bit Halftone Scan
– Color Bit Depth : 24bits (8bits/R.G.B.)
– PC Interface: USB
– TWAIN Driver: 1CD-ROM title provided along

with Bundle S/W.

5) Additional Spec.
– Scan Line Time : 2.5mS/line
– Contrast Control : 5 Step
– Enlargement & Reduction : 25 ~ 200%

Samsung Electronics

6-12

GIP 0
GIP 1
GIP 2
GIP 3
GIP 4
GIP 5
GIP 6
GIP 7
GOP 0
GOP 1
GOP 2
GOP 3
GOP 4
GOP 5
GOP 6
GOP 7
GIOP 0
GIOP 1
GIOP 2
GIOP 3
GIOP 4
GIOP 5
GIOP 6
GIOP 7
GIOP 8
GIOP 9
GIOP 10
GIOP 11
GIOP 12
GIOP 13
GIOP 14
GIOP 15

23
28
37
43
48
84
92

113

26
31
40
46
51

87
103
116

24

25

29

30

38

39

44

45

49

50

85

86

93

95
114
115

OK2PRINT
RESERVED
RESERVED
/P_EXIT

–

/RINGDET
/HOOK_OFF
RESERVED
CIS_SH
RESERVED
BLED
RLED
GLED
PREHEA T_C
RESERVED
PREHEA T_M
/DRAM_EN
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
CML_ON
VOL2
VOL1
VOLO
C_HEADDA TA
/SPK_CTL
AMB_TEMP
M_HEADDA TA

NO FAULT IN PRINT HEAD FAULT IN PRINT HEAD

N.C N.C
N.C N.C

–

DETEC INCOMING PAPER FROM ASF

––
–

RING DETECTION FROM TEL LINE

EXTERNAL PHONE HOOK ON EXTERNAL PHONE HOOK OFF

N.C N.C

CIS SHADING ON CIS SHADING OFF

N.C N.C

BLUE LED ON BLUE LED OFF

RED LED ON RED LED OFF

GREEN LED ON GREEN LED OFF

PREHEATING COLOR PRINT HEAD

–

N.C N.C

PREHEATING COLOR PRINT HEAD

–

Disable DRAM to idle state Enable DRAM to read state

N.C N.C
N.C N.C
N.C N.C
N.C N.C
N.C N.C
N.C N.C
N.C N.C

FAX CONNECTED TEL LINE OR EXT. PHONE

COLOR PRINTHEAD ID DATA: SERIAL HEX CODE : 08H

AUDIO AMP. OFF AUDIO AMP. ON
BI-DIRECTION DATATRANSFER TO FROM DIGITAL THERMOMETER
MONO PRINTHEAD ID DATA: SERIAL HEX CODE : 07H

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I/O
I/O
I/O
I/O
I/O
I/O
I/O

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I/O

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6-1-4-5 I/O PORT FOR SCANIP

PIN

NAME

PIN

NO.

I/O

CIRCUIT

NAME

H L

DESCRIPTION

VOL 2 VOL 1 VOL0 4051 OUTPUT

H H H VOLUME LEVEL7 : RING VOLUME MAX
H H H VOLUME LEVEL6 : RING VOLUME
H L H VOLUME LEVEL5 : RING VOLUME MIN
H L L VOLUME LEVEL4 : RING VOLUME OFF

L H H VOLUME LEVEL3 : LINE MONITORING VOLUME MAX
L H L VOLUME LEVEL2 : LINE MONITORING VOLUME
L L H VOLUME LEVEL1 : LINE MONITORING VOLUME
L L L VOLUME LEVEL0 : LINE MONITORING VOLUME MIN

Circuit

Samsung Electronics

6-13

Circuit

6-1-5 Printer

6-1-5-1. 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.6­1-11. Block Diagram of Printer shows the entire struc­ture.

6-1-5-2. HEAD DRIVER (U18,U19,U14,U21)

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 (U18,U19) selects
head address and 16 column 8-bit
driver (U14,U21) 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:U18,U19)
This is a 13-line signal impressed to row drive IC
through the output port of MFP controller(/HGA1 ­/HGA13), 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 (1/1200÷16 groups).
The signal put in each driver(window time) is active
“L”, with the biggest driver current max 100mA and
output voltage +11.75V.

• Column Driver Circuit (HD8:U14,U21)
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 (HOE1 - HOE16). 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
“H”. If not, it is put out at “L”. 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.

Samsung Electronics

6-14

6-1-5-3. HEAD CONTROLLER

This part consists of +22V Power Controller to
control head driver, Fault Test, Head Detection,
Substrate Heating

It checks and controls head driver and ink cartridge.

KS32C6400

(U26)

Ink

Cartridge

Mono

and

Color

MFP

CONTROLLER

SCANIP (U29)

IMAGE

PROCESSOR

/FAULT-TEST

/HGA1

/HGA13

HOE1

HOE16

/FAULT-TEST

OK2PRINT

BIASOFF

HEAD-DATA

/M_HEAD_EN, /C_HEAD_EN)

PRE-HEAT

BH1 (CH1)

HSC,HSM

BS1 (CS1)

BP1 (CP1)

BA13 (CA13)

BA1 (CA1)

BP16 (CP16)

/FAULT

HEAD-DATA

Driver

Row
(7bit)

+22V Power

Controller

Driver

Column

(8bit)

Fault (Short)

Test

Head

Detection

Head

Selector

Substrate

Heat

HEAD-ADDRESS

Fig.6-1-9 Block Diagram of Printer

Circuit

Samsung Electronics

6-15

Circuit

• +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
(K32C6400:U26) 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 “high” or getting turned
off if “low”.(in case of /FAULT-TEST
signal: HIGH) While +22V is being impressed after
/RST-OUT is “High”, comparator output gets “low”
and turns off +22V driving TR(TIP112) if /FAULT­TEST signal is put out at “low” 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 “low”
and +22V is turned “off”, “OK2PRINT”
signal is entered. The port of KS32C6400(U26)
shows normal condition if “H” and a short if “L”. If
you make FAULT-TEST output “L” to detect fault of
the head, +22V gets off. If the head is in a short
(LOW), when the level of “/FAULT-TEST” signal

goes “L” and final “OK2PRINT” output goes “L”.
KS32C6400(U26) 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 /FAULT­TEST 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°…).(Refer to Timing Chart.) It
sends PRE-HEAT signal through I/O port of
SCANIP(Color Image Processor:U29) and supplies
+11.75V.

Mono Head

Fig.6-1-10. Temperature around Mono Head

Pre-Heat if below 35°c

70°C

35°C

Samsung Electronics

6-16

• 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-DATAport of KS32C6400
through BSF 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.

Color Head

Fig.6-1-11. Temperature around Color Head

70°C

HSC or HSM

(Pwr)

BA3

(Load)

BA1

(Clock1)

BA2

(Clock2)

C_HEADDATA or

M_HEAD DATA

bit7

Min 500ns Clock Delay(Min 500ns)

bit6 bit5 bit4 bit3 bit2 bit1 bit0

Head I.D read : HEAD-DATA (Clock 1,2=50~500KHz).

Mono : 07H
Color : ICH
Photo : 09H

Fig.6-1-12. HEAD DETECTION TIMING DIAGRAM

Circuit

Samsung Electronics

6-17

Circuit

6-1-5-4. HEAD DRIVING TIMING

Control signal from MFP controller (KS32C6400:U26)
enters the head drivers and it becomes the level to be
able to drive the head nozzles (+11.75V). It is depicted
in the following diagram.

BA

Signal

tp(PD)

BP

Signal

Pre-Heat Pulse Width Fire Pulse Width

Fire Enable Timer

Pre-Heat Delay Width

Front End Delay

Back End Delay

Fig.6-1-13. HEAD DRIVING TIMING DIAGRAM

Samsung Electronics

6-18

HSC or HSM

BA1
BA2

BA3
BA4

BA5
BA6

BA7
BA8
BA9

BA10
BA11

BA12
BA13

(Tp)

BP1-

BP16

Fig.6-1-14. TIMING DIAGRAM FOR EACH NOZZLE

Circuit

Samsung Electronics

6-19

Circuit

6-1-5-5. INK CARTRIDGE

• PIN ARRAY OF MONO INK CARTRIDGE
There are 208 heater chips in mono ink cartridge.

Column

Address (BA1_ ~ BA13_)

Data(BPx)

12345 678910111213

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 27474135294943373152453933
4 46403428494236305044383252
5 53736761557569635777716559
6 72666054746862567670645878
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 1 13 107 127 121 115 109 129 123 117 111
10 124 118 1 12 106 126 120 1 14 108 128 122 116 110 130
1 1 131 151 145 139 133 153 147 141 135 155 149 143 137
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

Samsung Electronics

6-20

• 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)

12345 678910111213

1 - 19 13 7 11 21 15 9 3 23 17 1 1 5
2 15126 -2014 8 2221610 424
3 25453933274741352949433731
4 44383226464034284842363050
5 51716559537367615575696357
6 70645852726660547468625676
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 1 10 104 124 118 1 12 106 126 120 114 108 128
1 1 129 149 143 137 131 151 145 139 133 153 147 141 135
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 -

Circuit

Samsung Electronics

6-21

Circuit

6-1-6 Motor Driver

6-1-6-1. GENERAL

This product use 1 dc motor and 2 stepper motors, i.e.
CR(Cartridge Return) motor and LF(Line Feed) motor,
TX (Transmission) motor.
CR motor moves left and right all-in-one carriage of
inkjet head. It helps the printer print accurately on the
paper. LF motor is driven to feed and eject paper for
printing and to feed and eject documents to read for
scanning. CR dc motor is controlled dc control block,
while LF motor half step and quarter step at maxi­mum 6ips.

6-1-6-2. CR(CARRIAGE RETURN) MOTOR

DRIVING CIRCUIT

CR motor moves the carriage left and right when ink
cartridge prints something on paper.

- Motor Type : PMDC Motor.

- Driving Voltage : +30V

- Winding Resistance : 12Ω ±2Ω

- Driving IC : TEA3718SFP 5 1

As shown in the above table, current in each mode is
adjusted by voltage of driver(U13) PIN 12 input. If the
PWM signal controlled by MFP controller(U26) is
“high”, TR(Q4) will be turned on and the voltage put
in to PIN 12 of driver (U13) with 0V.

It becomes the standard of the driver, resulting in high
current drive mode. If PWM is “low”, TR(Q4) will be
turned off and the voltage put in to PIN12 will go up
(+5.0V), resulting in no current in the motor.

RI and U16A control the current chopping level of U1
through TR(Q3, Q6).
Q6 and Q3 supplies necessary logic level to put CR
Driver IC(U4) into maximum (100%) current drive
mode. If pin 9 and 11 of U4 are both “high”, no cur­rent will be driven, but if pin 9 and 11 are both “low”
U4 will be in a maximum current drive mode.

Motor

DIR PWM

CURRENT

OPERA TION REMARK

Driver DIRECTION

OFF L L X STOP

ON L H B › A RIGHT DIRECTION

OFF H L X STOP

ON H H A› B LEFT DIRECTION

Samsung Electronics

6-22

6-1-6-3. 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 : 12Ω ± 10%

- Driving IC : PBL3717A u 2

6-1-6-4. TX(TRANSMISSION) MOTOR DRIVING CIRCUIT

TX Motor is driven at maximum 1200pps when feeding or ejecting sheets.

- Motor Type: unipolar skepper

- Driving Voltage : +30V

- Winding Resistance : 80Ω ± 10%

- Step Degree : 7.5 deg/step

- Driving IC : ULN2003A

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

TXIA1 TXIA0 PHASE OPERATION LINE TIME REMARK

Fine 2–2 phase 400pps 2.5mS Mono Binary

Super Fine 2–2 phase 400pps 2.5mS Mono Binary

Gray Scale 1–2 phase 159pps 12.6mS Color

1–2 phase 196pps 10.2mS Mono n

Driving speed for each mode

Circuit

Samsung Electronics

6-23

Circuit

6-1-7 F AX Transceiver

6-1-7-1. GENERAL

This circuit processes transmission signals of modem
and between LIU and modem.

6-1-7-2. MODEM (U37)

KS16117 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 (U26:KS32C6400) can initialize
modem(/MODEM_RST) 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 KS16117 is supported up to

14.4k.

6-1-7-3. TRANSMITTER

This circuit processes transmission output, analog sig­nal of modem(KS16117).
Output signal in each mode goes out of modem
(TXOUT:U37-44). After D/A signals are smoothed and
filtered through active filter (U40-1,2), they are
put out to LINE through LIU board.

6-1-7-4. RECEIVER

In the receiving mode, analog signals coming in
through LIU board are transmitted to input terminal
of modem (RXIN:U23-45) through smoothing filter
(U40-6,7).

Fig.6-1-15. FAX TRANSCEIVER

FAX TRANSMISSION

U40

U40

FAX RECEPTION

MODEM
KS161 17

(U23)

LIU

Samsung Electronics

6-24

6-2-1. SUMMARY

OPE Board is separated functionally from the main
board and operated by the micom in the board. OPE
and the main use UART (universal asynchronous
receiver/transmitter) channel to exchange informa­tion. OPE reset can be controlled by the main. OPE
micom controls key-scanning and LCD and LED dis­play, detects documents and
senses SCAN position. If there occurs an event in OPE
(such as key touch and sensor level change), it sends
specific codes to the main to respond to the situation
and the main analyzes these codes and operates the
system. For example, if the main is to display mes­sages in OPE, the main transmits data through UART
line to OPE according to the
designated format and OPE displays this on LCD,
LED. OPE’s sensing is also transmitted to the main
through UART line and then the main drives
necessary operation.

6-2-2

OPE PBA consists of MICOM, LCD, key matrix,
SCAN position sensor and the document detect sen­sor. Refer to OPE Schematic Diagram and Wiring
Diagram sections of this manual.

• Signals from the key matrix are delivered to U1X/Y
input pin group (P1-x).

• U1 pin 48 (TX DATA) is the UART code sent to
MAIN PBA.

• Display from the controller is received at U1 pin
47(RX DATA).

• LCD drive signals are sent from U1 pin 8~10, 15~18,

30~33.

• Document detect sensor output is received at U1
pin 1.

• Scan position sensor output is received at U1 pin 7.

Scan
Position
Sensor

Document
Detect
Sensor

Connector

MICOM

HT48R50

RESONATOR

7.37 MHz

LCD
16 u 2 lines

Key Matrix

8Y

7

11

UART 2

Reset

X

Fig.6-2-1. OPE BLOCK DIAGRAM

6-2. OPE PBA

Circuit

Samsung Electronics

6-25

Circuit

6-3 LIU PBA

6-3-1 Summary

LIU(Line Interface Unit) circuit is controlled by the
main circuit.
It monitors telephone line and helps interface between
the system and the telephone line. It uses transformers
(T1,T2)and photo couplers(U1,U6,U7,U2)to control the
whole LIU, MODEM/LINE INTERFACE, RING SIG­NAL DETECTOR, DIALER,and LINE CURRENT
DETECTOR,

6-3-2 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.

• T2 trans former : This component receives and

transmits fax image signal from the line to a inodem
and a modem to the line.

• AC impedance: Normal operation range of LIU

is from 15mA to 100mA. DC
characteristics depend on the voltage at Q1 and
R20.
Basic AC impedance is 600Ω but it can be adjusted
by changing the value of C2, C3, C4.

6-3-3 Ring Signal Detector

• U3-28(MO) terminals are ring signal output
terminals. Q4 and Q5 put out ring signals and drive
Piezzo. It has only the functions related to ring
detection such as driving the photocoupler of U4
and delivering ring signals to MFP
controller of the main.

6-3-4 Dialer

6-3-4-1. MF DIAL

• Default mode it is set in MF. You can change it to
DP mode by control of MFP controller.

• MF signal is generated and controled by a inodem

in a main board.

• MF signal can be measured at FLT1 or FLT2.

6-3-4-2. DP DIAL

• DP signal is made by a controller.

This signal turns on/off U6.
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.

Samsung Electronics

6-26

6-3-7 MAJOR FUNCTIONS OF PARTS

1) U6 : PC817C

- It relays dial pulse control signal to primary
circuit part.

- Insulation between primary and secondary
circuit part.

2) U1 : PC817

- It senses and delivers ring signal to the main
board.

- Insulation between primary and secondary
circuit part.

3) U2 : PC814

- It senses hook-off (Line connection) of the
external telephone and delivers it to the main
board.

- Insulation between primary and secondary
circuit part.

4) BD1 : BRIDGE DIODE

- Regardless of the polarity of DC power from

telephone line, the voltage put out on Pin.1
has always + polarity against pin Pin.2. So
DC loop forms always in the same direction
regardless of the polarity of the telephone
line.

5) T1,T2 : TRANSFORMER

- It delivers signals from the telephone line
to modem or signals from modem to the
telephone
line.

- Insulation between primary and
secondary circuit part.

Circuit

Samsung Electronics

6-27

Circuit

6-4 SMPS

6-4-1 Block Diagram of Power Circuit

Refer to the following block diagram.

INLET

INPUT

FILTER

SNUBBER

CIRCUIT

START-UP

CIRCUIT

HALF WAVE

RECTIFIER

HALF WAVE

RECTIFIER

HALF WAVE

RECTIFIER

VOLTAGE

DETECTION

OVER

VOLTAGE

PROTECTION

3-TERMINAL

REGULATOR

CH1
+5V
RED

#1

GND

BLACK

#2

CH3

+30V

GREEN

#6

CH2

+11.75V

YELLOW

#3

GND

BLACK

#4,#5

SWITCHING

DEVICE

PHOTO

COUPLER

Nb1

Nb1

Ns2

Ns2

Ns1

ERROR

AMPLIFIER

PWM

CONTROL

CIRCUIT

OVER

CURRENT

DETECTION

FULL WAVE

RECTIFIER

AC250V2A

AC220-240V2A

N

a

b

a

b

* , See Below Table

POWER SUPPLY

6-4-2 Specifications of Power Circuit

6-4-2-1. INPUT CONDITIONS

1 Input Rated Voltage AC110–240Vac (a)
2 Input Voltage Turning Range AC90–270Vac (b)
3 Rated Grequency 50–60Hz
4 Frequency Range 47–63Hz
5 Input Current 0.5Arms

Free Voltage

Samsung Electronics

6-28

6-4-2-2. OUTPUT CONDITIONS

6-4-3 Power Circuit

6-4-3-1 INPUT

This product is equipped with a three-wire
grounding-type power inlet. Insulation is class 1.
When a power device part breaks down or some trou­ble in this circuit causes a short, excess current runs
through a fuse and blows it to protect power devices
and the system from excess current and
prevent a fire.
Input filter of power input terminal removes line
noise flown in from outside and reduces noise which
is made in power circuit and logic part and conducted
or radiated through power cords.
AC input voltage is rectified by bridge diode of full
wave rectifier, is converted to DC voltage by smooth­ing circuit, and switches the power device of this volt­age.

As switching is in RCC(Ringing Choke Converter)
mode, switching frequency changes from about
50KHz to 100KHz.
PWM(Pulse Width Modulation) Control Circuit
adjusts the duty of the switching device by sensing
the change of output voltage, and protects this
product from excess current by receiving signals from
excess current detecting circuit.

6-4-3-2 DRIVING CIRCUIT (START-UP CIRCUIT)

If you insert a power plug into AC outlet, full-wave
rectified DC output voltage is generated at input elec­trolysis condenser and supplied to the gate of a
switching device through driving resistance. This volt­age drives the switching device. Once it is
driven, it continues to switch via PWM control
circuit with power supplied by auxiliary coil Nb.

6-4-3-3 SWITCHING CIRCUIT

(VOLTAGE STABILIZATION)

11.75V of 2nd voltage is detected by voltage detector
and feeds back through photo coupler to 1st PWM
Control Circuit signals compared by error amplifier.
PWM Control Circuit controls the gate of power tran­sistor according to the feedback voltage so as to sup­ply load with stable output voltage.

NO ITEM CH1 CH2 CH3

1 RATED OUTPUT VOLTAGE +5.0V +11.75V +30V
2 RATED OUTPUT CURRENT 0.5A 0.8A 0.5A
3 MAXIMUM LOAD CURRENT 0.8A, 20sec 1.3A, 20sec 0.76A, 20sec

4 LOAD CHANGE RANGE 0.1 ~ 0.8A 0.03 ~ 1.3A 0.05 ~ 0.76A

Circuit

Samsung Electronics

6-29

Circuit

6-4-3-4 OCP CIRCUIT

(OVER CURRENT PROTECTIVE CIRCUIT)

If a short in secondary load terminal or a short inside
power device causes excess current, power consump­tion increases. Then it increases current of power tran­sistor .
The current of power transistor increases linearly
when it is on. This current is detected by sensing resis­tance and is impressed to excess voltage
protective circuit of PWM control circuit through RC
integration circuit where over current protection is
built in.
If this voltage becomes bigger than Vbe of excess cur­rent control transistor, the potential of power transis­tor gate falls immediately and it stops driving power
transistor to protect it from excess current.

6-4-3-5 OVP CIRCUIT

(OVER VOLTAGE PROTECTIVE CIRCUIT)

If the main power of power device 11.75V increases
abnormally, this excess voltage is detected by OVP
detecting circuit and 11.75V output terminal shifts to a
state similar to
a short.
If 11.75V output terminal shorts, over current runs on
over current detecting terminal and OCP circuit oper­ates to prevent a fire in power device.

6-4-3-6 +5V OUTPUT TERMINAL

Square wave voltage generated by Ns1 produces DC
voltage rectified and smoothed by half-wave rectifier.
This voltage put in to a three-wire regulator generates
stable DC power of +5V.

6-4-3-7 +30V OUTPUT TERMINAL

Square wave voltage generated by Ns2 is rectified and
smoothed by half-wave rectifier and supplies load
with output voltage without separate
regulation.

6-4-3-8 +11.75V OUTPUT TERMINAL

Square wave voltage generated by Ns3 is rectified and
smoothed by half-wave rectifier, and then detected by
voltage detector. Signals compared by error amplifier
are fed back to primary PWM
control circuit through photo coupler.
PWM control circuit controls the voltage of power
transistor gate driver according to the voltage to sup­ply load with stable output voltage.

6-5-1 Paper Sensing Circuit

This circuit senses whether there is paper or not, using
photo interrupter. If there is no paper, the lever will
cover its sensor and output “/P_EXIT”

will become “High”. If there is paper, the lever will be
lifted and output “/P_EXIT” will become “Low”.

6-5 Others

Lever

+5V +5V

/P_EXIT

Photo

Interrupter

Samsung Electronics

6-30

6-5-2 Home Sensing Circuit.

This circuit checks whether a carriage is at home or
not.
A encorder sensor is used as a home sensor to detect
home position. This encorder sensor uses a encoder
strip, attached to a main frame, to detect current posi­tion and moving direction. Aencoder sensor outputs
CHY and CHX signal to a main controller(U26). U26

uses these two signals to sense the carriage’s direction.

Circuit