Samsung SF4500 Circuit Descriptions

6. Circuit

6-1 Main PBA

6-1-1 Summary

The main circuit that consists of CPU, MFP
c o n t roller (built-in 32bit RISC processor core :
ARM7TDMI) including various I/O device
drivers, system memory, scanner, printer, motor

d r i v e r, PC I/F, and FAX transceiver controls the
whole system. The entire stru c t u re of the main
c i rcuit is as follows:

Fig.6-1-1. Entire Structure of Main Circuit for Each Key Signal

Samsung Electronics 6-1

6-1-2 MFP Controller (KS32C6200 : U16)

M F P C o n t roller consists of CPU(ARM7TDMI RISC
p rocessor), 2K-byte cache, data and address buses,
serial communication part with LIU(Line Interface
Unit), OPE(OPERATION PANEL) print head con­t ro l l e r, parallel port interface, external DMApart to
receive data from external color image pro c e s s o r
(SCANIP:U18), LF/CR motor diver
c o n t roller and I/O contr o l l e r.

6-1-2-1. SYSTEM CLOCK

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

6-1-2-2. 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.

• C H I P SELECT (/IP_CS, /ROMCS, /MCS /
R A M C S )

- /IP-CS : SCANIP(U18) CHIP SELECT (LOW

A C T I V E )

- /ROMCS : ROM/FLASH MEMORY(U5) CHIP

SELECT (LOW A C T I V E )

- /MCS : MODEM(U15) CHIP SELECT (LOW

A C T I V E )

- /RAMCS : SRAM (U14) CHIP SELECT (LOW

A C T I V E )
When each CHIP SELECT is low, data can be read or
w r i t t e n .

• D0 - D15

- 16bit data bus

• A0 - A 1 7

- ADDRESS BUS (A18 - A21 are re s e r v e d . )

6-2 Samsung Electronics

6-1-2-3, LIU(Line Interface Unit) Serial
Communication Part

U A RT (Universal A s y n c h ro n o u s
R e c e i v e r / Transmitter) at KS32C6200 enables the
main and LIU, main and OPE to transmit serial

Fig.6-1-2. UART BLOCK DIAGRAM

data. The block diagram of UART is as follows:
(Fig.6-1-2) KS32C6200 has 2 UART channels. The
baud rate is 9600bps.

Fig.6-1-3 UART DATAFORMAT

Samsung Electronics 6-3

6-1-2-4 EXTERNAL D M A

It brings data from an external device (SCANIP:U18)
using DMAchannel 0. DMAREQUEST sent from an
external device to KS32C6200 activates DMA
ACKNOWLEDGE 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.

Fig.6-1-4 EXTERNAL DMA TIMING DIAGRAM

6-4 Samsung Electronics

6-1-2-5. DRAM CONTROLLER

6-1-2-6. PARALLEL PORT INTERFACE

As KS32C6200 has DRAM controller in it, DRAM can
be connected with external memory.
The control mode of DRAM controller enabling
E A R LY WRITE, NORMALREAD, PAGE MODE,
and BYTE/HALF WORD ACCESS supports EDO
DRAM as well as normal DRAM. DRAM
READ/WRITE signals are /R D and /W Rs i g n a l s
used to control system buses. It supports CAS
BEFORE RAS for DRAM REFRESH and self-re f re s h
mode for DRAM backup. Connected with common
/L C A S , /U C A Sand RAS [1:0], it consists of 2 banks.
Though each may be connected with up to 1M - 4M
h a l f w o rd, two (2) of 512 Kbytes are
connected for this pro d u c t .

This part connected with the computer through the
c e n t ronics connector makes possible parallel
interface with the computer. Data is transmitted
a c c o rding to the standard of IEEE P1284. This MFP
c o n t roller 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
E C P (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 .

Fig.6-1-5 Compatibility Hardware handshaking Timing

Samsung Electronics 6-5

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

Fig.6-1-7 ECP Hardware Handshaking Timing (reverse)

6-6 Samsung Electronics

6-1-2-7. 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], /F A U LT­T E S T, /HEAD-EN, 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.

Fig.6-1-8 Timing Diagram to Drive Head

Samsung Electronics 6-7

Fig.6-1-9. 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. PRINTER MOTOR CONTROLLER

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

M F P C o n t roller (KS32C6200:U16) supports 2
stepper motors. 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

a c c o rding 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 .

6-8 Samsung Electronics

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

PIN NAME

G O P 0 / T X D 0
G O P 1 / T X D 1

G O P 2 / n E D A C K

G O P 3 / TO N E
G O P 4 / n R S T 0
G O P 5 / n I O W R 1
G O P 6 / n I O W R 2
G O P 7 / n I O R D 1
G O P 8 / n I O R D 2
G O P 9 / C L K O U T
G O P 1 0 / F I R E P S
G O P 11 / n H S C

PIN NO

1 2 2
1 2 4

1 3 9

1 4 9
1 5 0
1 3 4
1 5 5
1 5 6
1 5 1
1 5 2
1 5 3
1 5 4

I/O PORT NAME

p
p

p

p
p
p
p
p
p
p
p
p

L I T _ T X D

O P E _ T X D

n X D A C K

K E Y C L I C K

n R S T 0

n FA U LT _ T E S T

R X _ C T L
n H E A D _ E N
TO N E _ C T L

I P _ C L K

n R S T _ O U T

B I A S O F F

DESCRIPTION FOR STATE

H L

Serial Data Output to ILIU

Serial Data Output to OPE

D M AAcknowledge to

–

S c a n _ I P

Keyclick To n e

Watchdog Reset Signal Output

– Head Fault Test Enable

Line for RX. Line for TX. or Remote

– Head Enable

Line Monitoring K e y c l i c k

Clock Output for Scan_IP

External Reset Output

– Head Data Read
G O P 1 2 / n H S M
G I P 0 / n R X D 1
G I P 1 / n R X D 2
G I P 2 / n E I N T 1

G I P 3 / n E I N T 2

G I P 4 / n E D R E Q
G I P 5 / U C L K
G I O P 0 / T C K
G I O P 1 / T M S
G I O P 2 / T D I
G I O P 3 / n T R S T
G I O P 4 / T D O

3 0
1 2 3
1 2 5
1 3 6

1 3 7

1 3 8
1 2 8

3 7

3 8

3 9

4 0

4 1

p

I
I
I

I

I

I
B
B
B
B
B

C R _ R E F

L I U _ R X D

O P E _ R X D

n M I R Q

n T X _ I N T

n X D R E Q

H E A D _ D ATA

T C K
T M S

T D I

n T R S T

T D O

LQ Mode Printing Draft Mode Printing

Serial Data Input from ILIU

Serial Data Input from OPE

– Modem Interrupt request

SCAN motor Interrupt

–

–

Serial Head Data from Head

Test Clock for ICE

TA P Controller Enable –

Serial Data Input from Emulator

– TA P Controller Reset

Serial Data Output to Emulator

D M ARequest from Scan_IP

r e q u e s t

Samsung Electronics 6-9

6-1-2-10. 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 re s e t
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 c o n t ro l l e r
(KS32C6200) after primary

reset. Primary reset makes flash memory wait in
READ mode to fetch program
codes, and secondary reset makes the main
c o n t roller (KS32C6200) wake up and initialize
external peripherals to operate the system.
Fig.5-1-10 is Power Reset Timing Diagram.

Fig.6-1-10 POWER RESET TIMING DIAGRAM

• POWER MONITOR (U103: 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, ru n-

KS32C6200 are reset first. Thereafter modem, print
c o n t rol parts and SCANIP(Color Image Pr o c e s s o r )
linked to /RSTOUT terminal of KS32C6200 are
reset as well. KIA7045F output
terminal of open drain stru c t u re is pulled up 5.1k Ω
and put out.

ning RESET (LOW ACTIVE). Flash memory and

6-10 Samsung Electronics

6-1-3 System Memory

6-1-4-2. SCAN RESOLUTION

System memory consists of 512KB flash memory,
2MB DRAM, and 32KB SRAM. Flash memory,
DRAM and SRAM are selected by each CHIP
SELECT (/ROMCS, /RAS0, /RAS1, /LCAS, /UCAS,
/RAMCS), and data is accessed half word (16bits) by
half word and one byte (8bits) by one byte.

DRAM is designed to be able to add 2MB to the basic
2MB so that buyers can make their options.
In addition, the backup circuit built in for DRAM
keeps data in user memory during at least
30-miniute power failure. Super capacitor
(1F) is used as a backup element. SRAM holds
telephone numbers and journal information and can
keep minimum information using backup battery
( L i t h i u m ) .

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 30-sheet ADF and 3-second quick scan functions.

– Normal(Quick) : 1/3.85mm, 1/8mm (98×2 0 3 d p i )
– Fine : minor scanning 1/7/7mm, main

scanning 1/8mm (196×2 0 3 d p i )

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

scanning 1/300inch(300×3 0 0 0 d p i )

6-1-4-3. CIS : Contact Image Sensor improves

p roductivity and is designed to be replaced easily.
Color models have color CIS.

➀ SF-4500/Msys4700/MJ-4500 : BN-30216D, 10Pin

C o n n e c t o r

– Minimum Scan Line Time: 1.8mS
– Light Source Power : 12V
– Maximum Pixel frequency : 2MHz
– Effective Sensor Element : 2552
– Clamp Level : 1.2 - 1.6V
– Bright Output : MIN 0.8V

➁ SF-4500C/Msys4800/MJ-4500C : CXB-30216G, 12

Pin Connector

– Minimum Scan Line Time for one color : 1.5mS
– Color Separation : RGB LED transfer mode
– Light Source Power : 12V
– Maximum Pixel frequency : 2MHz
– Effective Sensor Element : 2552
– Clamp Level : 1.2 - 1.6V
– Bright Output : MIN 0.8V

C I S

S C A N I P

CIS Control

Fig.6-1-11 CIP1A Block Diagram

Samsung Electronics 6-11

6-1-4-4. IMAGE PROCESSING

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

1-4V with about 2.8V white level. Optimum input
level of SCANIP is 1.5V offset and 3.5V white
level. So OPA M Pis 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
b u ffer through TIP algorithm if Normal is
selected for Image Processor SCANIP, thro u g h
E r ror Diffusion algorithm if medium, or thr o u g h
D M A without algorithm if PC Scan mode.
Commonly for all the three modes, it is pro c e s s e d
after shading correction and gamma corre c t i o n .
5×5 Window Processing begins after data is store d
in 32K Byte external SRAM.

Image Processor SCANIPhas the following
s p e c i f i c a t i o n s :

➀ Package: 128 Pin QFP
➁ Operating Frequency: 25 - 40MHz
➂ Minimum Scan Line Time: 1.5mS
➃ Scan Resolution: Max. 300DPI
➄ Scan Width: B4
➅ Major functions

– Internal 8bit A D C
– 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 Contro l
– Image Processing Mode : TIP, Ord e red dither,

E r ror diff u s i o n
– 256 Gray Scale
– AGC function
– PC Gray Scan function

➆ External SRAM: 32Kbyte, 15Ns Access Ti m e

3) CIS LED Driver: LED in CIS is on with 11 . 7 5 V. TR
c i rcuit is built in to drive this LED.

– Maximum LED current: 300mA

4) PC Scan function

– Resolution(V×H) : 3 0 0×3 0 0 / 7 5×75dpi

( P re-scanning mode)
1 9 6×2 0 3 / 9 8×2 0 3 d p i

– Mono Bit Depth : 8bits Gray Scan/1bit Te x t

Scan/1bit Halftone Scan
– Color Bit Depth : 24bits (8bits/R.G.B.)
– PC Interface: IEEE 1284 NIBBLE, BYTE, ECP
– T WAIN Driver: 1CD-ROM title provided along

with Bundle S/W.

5) Additional Spec.
– Scan Line Time : 2.5mS/line
– Contrast Control : 3 Step

( N o r m a l / D a r k e n / L i g h t e n )

– Enlargement & Reduction : 25 ~ 200%

6-12 Samsung Electronics

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

R E G I S T E R

N A M E

G P I

G P O

PIN NAME

for A S I C

G P I 0
G P I 1
G P I 2
G P I 3
G P I 4
G P I 5
G P I 6

G P I 7
G P O 0
G P O 1
G P O 2
G P O 3
G P O 4
G P O 5

I / O P O RT N A M E

I
I
I
I
I
I
I

I
p
p
p
p
p
p

O K 2 P R I N T

H O M E _ S E N

r e s e r v e d
n P _ E X I T

P _ E M P T Y

n R I N G _ D E T

n H O O K _ O F F

RY / n B Y

r e s e r v e d

n O P E _ R S T

B L E D ( C / – )

R L E D ( C / – )

G L E D ( C / M )

RT C _ E N

DESCRIPTION FOR STA T E

H L

Head OK Head NG

Head parking –

– Paper Detected

Paper empty –

– Ring Detected
– H/S hook off

Flash Ready Flash Busy

OPE reset off OPE seset on

1

1

2

BLED On BLED Off
RLED On RLED Off
GLED On GLED Off

RTC Enable RTC disable

G P I O 1

G P I O 2

G P O 6

G P O 7
G P I O 0
G P I O 1
G P I O 2
G P I O 3
G P I O 4
G P I O 5
G P I O 6
G P I O 7
G P I O 8
G P I O 9

G P I O 1 0
G P I O 11
G P I O 1 2
G P I O 1 3

p
p
p
p
p
p
p
p
p
p
p
p
p
p
p
p

P R E _ H E AT

C L K _ S E L

r e s e r v e d
r e s e r v e d
r e s e r v e d
r e s e r v e d
r e s e r v e d
r e s e r v e d
r e s e r v e d
r e s e r v e d

C M L O N

V O L 2
V O L 1
V O L 0

r e s e r v e d

n S P K _ C T L

Head Preheat On –

Jupiter idle mode Jupiter ?? mode

Fax or Tel Line Ext Phone Connection

C o n n e c t i o n

Bell (3 level) Volume (4 level)

Bell or Volume control

–

Audio amp. off Audio amp. on
G P I O 1 4
G P I O 1 5

p
B

T H M _ C L K

T H M _ D ATA

Clock IN for T h e r m o m e t e r

Serial Data from/to T h e r m o m e t e r

1 C/– : Color Only
2 C/M : Color/Mono

Samsung Electronics 6-13

6-1-5 Printer

6-1-5-1. GENERAL

It drives inkjet head to print printing data re c e i v e d
f rom the computer or fax data coming through the
line. It roughly consists of head driver, head
c o n t ro l l e r, and the ambient temperature sensor. Fig.6­1 - 11. Block Diagram of Printer shows the entire stru c­t u re .

6-1-5-2. HEAD DRIVER (U26, U27, U32, U22)

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
g roups of 13 nozzles. As to the driver that composes
each nozzle, 13 row 7-bit driver (U26, U27) selects
head address and 16 column 8-bit
driver (U32, U33) sends head data. Head driver
converts control signals from MFP c o n t roller to
+ 11 . 7 5 V, the level to be able to drive the head, and
p rovides them for the inkjet head.

• Row Driver Circuit (HD7:U26:U27)
This is a 13-line signal impressed to row drive IC
t h rough the output port of MFPc o n t ro l l e r ( / H G A 1

- /HGA13), used as an address to drive the head in
ink cartridge. Pulse period differs according to
head driving
f re q u e n c y. In 1200dpi (in case of Head: 12KHz)
mode, timing period is 2.6usec (1/1200÷16 gro u p s ) .
The signal put in each driver(window time) is
active “L”, with the biggest driver current max
1 0 0 m Aand output voltage +11 . 7 5 V .

• Column Driver Circuit (HD8:U32,U33)
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 c o n t roller (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 c o n­t ro l l e r. Besides the output signal may
d i ffer 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 re g a rdless of
the type of the head, with the
maximum driving current 400mAand output volt­age +11 . 7 5 V.

6-14 Samsung Electronics

6-1-5-3. HEAD CONTROLLER

This part consists of +22V Power Controller to
c o n t rol head driver, Fault Test, Head Detection,
Substrate Heating and ambient Te m p e r a t u re

S e n s o r. It checks and controls head driver and ink
c a r t r i d g e .

Fig.6-1-12 Block Diagram of Printer

Samsung Electronics 6-15

• +22V Power Contro l l e r
If you insert power cords, the main board will be
supplied with power. /POR signal put out thro u g h
reset circuit activates MFP c o n t ro l l e r
(K32C6200:U16) and MFP c o n t roller puts out exter­nal circuit reset signal /RST - O U T. This /
R S T-OUT signal and Vrefx (+2.5V) divided thro u g h
+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 /FA U LT-TEST
signal: HIGH) While +22V is being impressed after
/ R S T-OUT is “High”, comparator output gets
“low” and turns off +22V driving TR(TIP112) if
/ FA U LT-TEST signal is put out at “low” when you
check a short of the head driver and the ink car­tridge (head).

• FA U LT TEST CIRCUIT
This is a signal to detect whether the head
receiving the output of head column driver is in a
short. After /F A U LT-TEST signal is put out at
“low” and +22V is turned “off”, “OK2PRINT”
signal is entered. The port of KS32C6200(U16)
shows normal condition if “H” and a short if “L”.
If you make FA U LT-TEST output “L” to detect
fault of the head, +22V gets off. If the head is in a
short (LOW), when the level of “/FA U LT- T E S T ”

signal goes “L” and final “OK2PRINT” output
goes “L”. KS32C6200(U16) 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 /FA U LT signal, which
is pulled up by bias circuit controlled by /F A U LT­TEST and shows the condition by OK2PRINT
t h rough the comparator.

• S U B S T R ATE HEAT CIRCUIT
Mono ink cartridge of Babbage head is 600dpi head
that uses pigment ink. It is very sensitive to the
t e m p e r a t u re in and around the cartridge. In
p a r t i c u l a r, 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
s t a n d a rd (below 35°…).(Refer to Timing Chart.) It
sends PRE-HEAT signal through I/O port of
SCANIP(Color Image Processor:U18) and supplies
+ 11 . 7 5 V.

Mono Head

7 0 ° C

3 5 ° C

Pre-Heat if below 35°c

Fig.6-1-13. Temperature around Mono Head

6-16 Samsung Electronics

Color Head

7 0 ° C

Fig.6-1-14. Temperature around Color Head

• 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 STA RT & STO P B I T, and BA1 and
BA2 as clock signal of each bit, and ID signal in the

cartridge is put in HEAD-DATAport of KS32C6200
t h rough BSF line. With each bit
c o n t rolled, 8bit I.D data is read and ST O Pbit is put
out of BA3(LOAD) port. Then it finishes.
If data is mono, it is 07H. If color, 08H.

Fig.6-1-15. HEAD DETECTION TIMING DIAGRAM

Samsung Electronics 6-17

• SURROUNDING TEMPERATURE SENSOR
DS1621S(DALLAS SEMI.) is applied to read the
t e m p e r a t u re 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, con­t rolled by THM-CLK, THM-DATALINE. Digital
thermometer to check the surrounding temperature
is assembled along with home sensor in the frame
of assembly CR. After each line is inked, it re a d s
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 lere l .

6-1-5-4. HEAD DRIVING TIMING

C o n t rol signal from MFPc o n t roller (KS32C6200:U16)
enters the head driver (U26, U27, U32, U33) and it
becomes the level to be able to drive the head nozzles
( + 11.75V). It is depicted in the following diagram.

Fig.6-1-16. HEAD DRIVING TIMING DIAGRAM

6-18 Samsung Electronics

Fig.6-1-17. TIMING DIAGRAM FOR EACH NOZZLE

Samsung Electronics 6-19

6-1-5-5. INK CARTRIDGE

• PIN A R R AY OF MONO INK CART R I D G E
T h e re are 208 heater chips in mono ink cartridge.

C o l u m n

D a t a ( B P x )

1 1 2 1 1 5 9 3 2 3 1 7 11 5 2 5 1 9 1 3 7
2 2 0 1 4 8 2 2 2 1 6 1 0 4 2 4 1 8 1 2 6 2 6
3 2 7 4 7 4 1 3 5 2 9 4 9 4 3 3 7 3 1 5 2 4 5 3 9 3 3
4 4 6 4 0 3 4 2 8 4 9 4 2 3 6 3 0 5 0 4 4 3 8 3 2 5 2
5 5 3 7 3 6 7 6 1 5 5 7 5 6 9 6 3 5 7 7 7 7 1 6 5 5 9
6 7 2 6 6 6 0 5 4 7 4 6 8 6 2 5 6 7 6 7 0 6 4 5 8 7 8
7 7 9 9 9 9 3 8 7 8 1 1 0 1 9 5 8 9 8 3 1 0 3 9 7 9 1 8 5
8 9 8 9 2 8 6 8 0 1 0 0 9 4 8 8 8 2 1 0 2 9 6 9 0 8 4 1 0 4

9 1 0 5 1 2 5 11 9 11 3 1 0 7 1 2 7 1 2 1 11 5 1 0 9 1 2 9 1 2 3 11 7 111
1 0 1 2 4 11 8 11 2 1 0 6 1 2 6 1 2 0 11 4 1 0 8 1 2 8 1 2 2 11 6 11 0 1 3 0
11 1 3 1 1 5 1 1 4 5 1 3 9 1 3 3 1 5 3 1 4 7 1 4 1 1 3 5 1 5 5 1 4 9 1 4 3 1 3 7

1 2 3 4 5 6 7 8 9 1 0 11 1 2 1 3

Address (BA1_ ~ BA13_)

1 2 1 5 0 1 4 4 1 3 8 1 3 2 1 5 2 1 4 6 1 4 0 1 3 4 1 5 4 1 4 8 1 4 2 1 3 6 1 5 6
1 3 1 5 7 1 7 7 1 7 1 1 6 5 1 5 9 1 7 9 1 7 3 1 6 7 1 6 1 1 8 1 1 7 5 1 6 9 1 6 3
1 4 1 7 6 1 7 0 1 6 4 1 5 8 1 7 8 1 7 2 1 6 6 1 6 0 1 8 0 1 7 4 1 6 8 1 6 2 1 8 2
1 5 1 8 3 2 0 3 1 9 7 1 9 1 1 8 5 2 0 5 1 9 9 1 9 3 1 8 7 2 0 7 2 0 1 1 9 5 1 8 9
1 6 2 0 2 1 9 6 1 9 0 1 8 4 2 0 4 1 9 8 1 9 2 1 8 6 2 0 6 2 0 0 1 9 4 1 8 8 2 0 8

6-20 Samsung Electronics

• PIN A R R AY OF COLOR INK CART R I D G E
T h e re 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.

C o l u m n

D a t a ( B P x )

1 - 1 9 1 3 7 11 2 1 1 5 9 3 2 3 1 7 11 5
2 1 5 1 2 6 - 2 0 1 4 8 2 2 2 1 6 1 0 4 2 4
3 2 5 4 5 3 9 3 3 2 7 4 7 4 1 3 5 2 9 4 9 4 3 3 7 3 1
4 4 4 3 8 3 2 2 6 4 6 4 0 3 4 2 8 4 8 4 2 3 6 3 0 5 0
5 5 1 7 1 6 5 5 9 5 3 7 3 6 7 6 1 5 5 7 5 6 9 6 3 5 7
6 7 0 6 4 5 8 5 2 7 2 6 6 6 0 5 4 7 4 6 8 6 2 5 6 7 6
7 7 7 9 7 9 1 8 5 7 9 9 9 9 3 8 7 8 1 1 0 1 9 5 8 9 8 3
8 9 6 9 0 8 4 7 8 9 8 9 2 8 6 8 0 1 0 0 9 4 8 8 8 2 1 0 2

9 1 0 3 1 2 3 11 7 111 1 0 5 1 2 5 11 9 11 3 1 0 7 1 2 7 1 2 1 11 5 1 0 9
1 0 1 2 2 1 6 6 11 0 1 0 4 1 2 4 11 8 11 2 1 0 6 1 2 6 1 2 0 11 4 1 0 8 1 2 8
11 1 2 9 1 4 9 1 4 3 1 3 7 1 3 1 1 5 1 1 4 5 1 3 9 1 3 3 1 5 3 1 4 7 1 4 1 1 3 5

1 2 3 4 5 6 7 8 9 1 0 11 1 2 1 3

Address (BA1_ ~ BA13_)

1 2 1 4 8 1 4 2 1 3 6 1 3 0 1 5 0 1 4 4 1 3 8 1 3 2 1 5 2 1 4 6 1 4 0 1 3 4 1 5 4
1 3 1 5 5 1 7 5 1 6 9 1 6 3 1 5 7 1 7 7 1 7 1 1 6 5 1 5 9 1 7 9 1 7 3 1 6 7 1 6 1
1 4 1 7 4 1 6 8 1 6 2 1 5 6 1 7 6 1 7 0 1 6 4 1 5 8 1 7 8 1 7 2 1 6 6 1 6 0 1 8 0
1 5 1 8 1 - - 1 8 9 1 8 3 - - 1 9 1 1 8 5 - - - 1 8 7
1 6 - - 1 8 8 1 8 2 - - 1 9 0 1 8 4 - - 1 9 2 1 8 6 -

Samsung Electronics 6-21

6-1-6 Motor Driver

6-1-6-1. GENERAL

This product use 3 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 and shuttle scanner. 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. Bi-polar CR motor is
c o n t rolled half step with maximum 24ips(inch/sec),
while LF motor half step and
quarter step at maximum 6ips.

C R _ R E F

H L L 4 9 0 Mono LQ is being driven

C R I A 1 C R I A 0

( C R I B 1 ) ( C R I B 0 )

C U R R E N T ( m A ) O P E R AT I O N R E M A R K

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 : Stepper motor, bi-polar

- Driving Voltage : +30V

- Winding Resistance : 6Ω ± 10%

- Driving IC : TEA3718DP × 2

L L L 6 7 0 Color draft is being driven
L L L 6 7 0 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, U28) CRV R E F
input. If the output of CR_REF signal controlled by
M F P c o n t roller(U16) is “low”, TR(Q12) will be turned
o ff and the voltage put in to CRVREF of
driver (U25, U28) with +5V divided will go up
(+4.5V).

It becomes the standard of the driver, resulting in
high current. If CR_REF output is “high”, TR(Q12)
will be turned on and the voltage put in to CRV R E F
will go down (+3.0V), resulting in low current in the
m o t o r.

6-22 Samsung Electronics

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 × 2

L F I A 1 L F I A 0 C U R R E N T ( m A ) O P E R AT I O N R E M A R K

L L 6 7 0 When feeding document/paper
L H 4 0 0 When ejecting document/paper
X H 0 No current

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

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

- Motor Type: stepper motor

- Driving Voltage : +30V

- Winding Resistance : 4.6Ω ± 10%

- Step Degree : 7.5 deg/step

- Driving IC : PBL3717A× 2

T X I A 1 T X I A 0 C U R R E N T ( m A ) O P E R AT I O N R E M A R K

L L 6 7 0 Quick Scan/Fine/Super Fine
H L 2 2 1 S t a n d b y
H H 0 I d l e

Driving speed for each mode

MODE PHASE S P E E D R E M A R K

Quick Scan 2–2 phase 1 2 0 0 p p s

F i n e 1–2 phase 4 0 0 p p s

Super Fine 2–2 phase 4 0 0 p p s

Samsung Electronics 6-23

6-1-7 FAX Transceiver

6-1-7-1. GENERAL

This circuit processes transmission signals of modem
and between LIU and modem.
This circuit is added only to SmartJet 2000,
S F - 4 3 0 0 C .

6-1-7-2. MODEM (U15)

K S 1 6 117 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
c o n t roller (U16: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
c o n t rol READ and WRITE re s p e c t i v e l y. /IRQ is a sig­nal for modem interrupt.
Transmission speed of KS16117 is supported up to
1 4 . 4 k .

6-1-7-3. TRANSMITTER

This circuit processes transmission output, analog
signal of modem(KS16117).
Output signal in each mode goes out of modem
( T X O U T:U15-44). After D/Asignals are smoothed
and filtered through active filter (U12-2), they are
b u ff e red under OPAMP(U12-6) and put out to LINE
t h rough LIU boar d .

6-1-7-4. RECEIVER

In the receiving mode, analog signals coming in
t h rough LIU board are amplified at OPA M P
(U13-6), and then transmitted to input terminal of
modem (RXIN:U15-45) through smoothing filter
( U 1 3 - 2 ) .

M O D E M

K S 1 6 11 7

( U 1 5 )

U 1 2

U 1 3

Fig.6-1-18. FAX TRANSCEIVER

FAX T R A N S M I S S I O N

LIU

FAX RECEPTION

6-24 Samsung Electronics

6-2. OPE PBA

6-2-1. SUMMARY

OPE Board is separated functionally from the main
b o a rd and operated by the micom(Z8601) in the
b o a rd. OPE and the main use UART (universal asyn­c h ronous 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 thro u g h
U A RT line to OPE according to the
designated format and OPE displays this on LCD,
LED. OPE’s sensing is also transmitted to the main
t h rough UART line and then the main drives
necessary operation.

6-2-2 OPE Circuit

OPE PBAconsists of U1 (MICOM, Z8601), LCD, key
matrix, LED indicators, SCAN position sensor and
the document detect sensor. Refer to OPE Schematic
Diagram and Wiring Diagram sections of this manu­a l .

• Signals from the key matrix are delivered to
U 1 X / Y input pin group (P1-x).

• U1 pin 4 (TXD ATA) is the UART code sent to
MAIN PBA.

• Display from the controller is received at U1 pin 5
(RX DAT A ) .

• LCD drive signals are sent from U1 P2-x pin gro u p ,
P3-4~P3-6 pins.

• Machine status LED drive signals are sent from U1
P0-x pin gro u p .

• Document detect sensor output is received at U1
pin 33 (P3-3).

• Scan position sensor output is received at U1 pin 43
( P 3 - 1 ) .

Fig.6-2-1. OPE BLOCK DIAGRAM

Samsung Electronics 6-25

6-3 LIU PBA

6-3-1 Summary

LIU(Line Interface Unit) circuit added only to
SF-4500, SF-4500C is controlled by the main circuit.
It monitors telephone line and helps interface
between the system and the telephone line. It uses
1-LIU(STI9510) to control the whole LIU,
MODEM/LINE INTERFACE, RING SIGNAL
D E T E C TOR, DIALER, LINE CURRENT
D E T E C TOR, and SERIALI N T E R FA C E .

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.

• U3-3 TIT(Transformer Input from T r a n s f o r m e r ) :
This single ended input receives image signals
f rom 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
o v e r.

• AC impedance: Normal operation range of
U3(STI9510) is from 15mAto 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.

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
c o n t roller of the main.

6-3-4 Dialer

6-3-4-1. MF DIAL

• Default mode it is set in DP. You can change it to
MF mode by control of MFP c o n t ro l l e r.

• MF signal can be measured at (tone level of low
g roup: 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
l i n e .

6-3-4-2. DP DIAL

• If U3-2(DMS) is made Vcc by R42, it is set at 33:67
D P signal. If it is made Vss by R43, it is set at DP
signal. This product is set at DP s i g n a l .

• D P 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
c u r rent 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 DPd i a l .

6-3-5 Line Current Detector

• When CML1 relay connects telephone line, U3
(STI9510) of LIU board and MFP c o n t roller of the
main board (U16) start communication thro u g h
U A RT. U3 of LIU board sends signal that includes
information of line current value, whenever it
receives orders or data from U16 of the main board .

6-26 Samsung Electronics

6-3-6 Serial Interface

• This part does serial communication with MFP
c o n t roller of the main board (MAIN PBA:U16) that
c o n t rols the whole system. It controls LIU by giv­ing and taking all control orders and line
s t a t u s .

• U 3 - 11 RxD : Schmitt Trigger input, Receiving
t e r m i n a l .

• U3-29 TxD : Open Drain output terminal

• S t a n d a rd UART communication

- Baud Rate : 9600bps

- Start, Stop bit : 1bit each

- Data bits : 8 bit

- Parity bit : none

6-3-7 MAJOR FUNCTIONS OF PARTS

1) U3 : S T I 9 5 1 0

- Key part of LIU board. Speech Network,
D i a l e r, Ringer and UART are built in one IC
p a c k a g e .

2) U5 : PC817

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

- Insulation Detween prinary and secondany
c i rcuit part.

3) U6 : PC817

- Photo coupler. It enables UART ( U 3 - 2 9 : T x D )
of U3(STI9510) to deliver telephone line
status or response signal about control
signal or dialing information from LIU MFP
c o n t roller of the main board (U15).

- Insulation Detween prinary and secondany
c i rcuit part.

4) U4 : PC817

- It senses and delivers ring signal to the main
b o a rd .

- Insulation Detween prinary and secondany
c i rcuit part.

5) U2 : PC814

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

- Insulation Detween prinary and secondany
c i rcuit part.

6) BD1 : BRIDGE DIODE

- R e g a rdless of the polarity of DC power

f rom telephone line, the voltage put out on
Pin.1 has always + polarity against pin
Pin.2. So DC loop forms always in the same
d i rection re g a rdless of the polarity of the
telephone line.

7) T2,T3 : T R A N S F O R M E R

- It delivers signals from the telephone line
to modem or signals from modem to the
t e l e p h o n e

l i n e .

- Insulation Detween prinary and
secondany circuit part.

Samsung Electronics 6-27

6-4 SMPS

6-4-1 Block Diagram of Power Circuit

Refer to the following block diagram.

POWER SUPPLY

6-4-2. Specifications of Power Circuit

6-4-2-1. INPUT CONDITIONS

120V 220V Free Voltage

1 Input Rated Voltage A C 1 2 0 Vac (a) A C 2 2 0 – 2 4 0 Vac (a) A C 11 0 – 2 4 0 Vac (a)
2 Input Voltage Turning Range A C 8 5 – 1 3 5 Vac (b) A C 1 8 0 – 2 7 0 Vac (b) A C 8 5 – 2 7 0 Vac (b)
3 Rated Grequency 60Hz 50–60Hz 5 0 – 6 0 H z
4 Frequency Range 57–63Hz 47–63Hz 47–63Hz
5 Input Current 0.5Arms 0.3Arms 0 . 5 A r m s

6-28 Samsung Electronics

6-4-2-2. OUTPUT CONDITIONS

NO ITEM CH1 CH2 CH3

1 RATED OUTPUT VOLTAGE +5.0V +11.75V +30V
2 RATED OUTPUTCURRENT 0.5A 0.8A 0.5A

3 MAXIMUM LOAD CURRENT 0.8A 1.3A 0.76A

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

6-4-3. Power Circuit

6-4-3-1 INPUT

This product is equipped with a thre e - w i re
g rounding-type power inlet. Insulation is class 1.
When a power device part breaks down or some
t rouble in this circuit causes a short, excess curr e n t
runs through a fuse and blows it to protect power
devices and the system from excess current and
p revent 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 cord s .
AC input voltage is rectified by bridge diode of full
wave re c t i f i e r, 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 Circ u i t
adjusts the duty of the switching device by sensing
the change of output voltage, and protects this
p roduct from excess current by receiving signals
f rom excess current detecting circ u i t .

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
e l e c t rolysis 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
c i rcuit 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
C o n t rol 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.

Samsung Electronics 6-29

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
t r a n s i s t o r.
The current of power transistor increases linearly
when it is on. This current is detected by sensing
resistance and is impressed to excess voltage
p rotective 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
c u r rent 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 O V P CIRCUIT

(OVER VOLTAGE PROTECTIVE CIRCUIT)

If the main power of power device 11.75V incre a s e s
a b n o r m a l l y, 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 c i rc u i t
operates to prevent a fire in power device.

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

S q u a re wave voltage generated by Ns1 produces DC
voltage rectified and smoothed by half-wave re c t i f i e r.
This voltage put in to a thre e - w i re regulator gener­ates stable DC power of +5V.

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

S q u a re wave voltage generated by Ns2 is r e c t i f i e d
and smoothed by half-wave rectifier and supplies
load with output voltage without separate
regulation.

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

S q u a re wave voltage generated by Ns3 is r e c t i f i e d
and smoothed by half-wave re c t i f i e r, and then detect­ed by voltage detector. Signals compared by erro r
amplifier are fed back to primary PWM
c o n t rol 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. Others

6-5-1. Paper Sensing Circuit

This circuit senses whether there is paper or not,
using photo interru p t e r. 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”.

6-30 Samsung Electronics

6-5-2. Home Sensing Circuit

This circuit senses whether carriage is at home or
not. This function is carried out when the system is
turned on or when the head is capped. Photo
i n t e r rupter is used as a home detecting sensor,

attached to the back of the carriage. When the
carriage moves left and right, output is “high” if the
frame rib covers the center of the sensor and “low” if
it is out of home.

6-5-3 Temp IC Driving Circuit

T E M P IC(DC1621S, Thermometer) mounted on the
sensor card on the back of the carriage is used to re a d
the temperature around ink cartridge.
This IC converts the temperature around IC
package into digital and sends the temperature data
to serial to make it sense the temperature

a round the head. It senses temperature so that the
t e m p e r a t u re of the head can be the optimum when
you print something. The above IC sends data seri­ally using signal lines(THM_DATA, THM_CLK).

Samsung Electronics 6-31