SAMSUNG FAXF110T Service Manual

FACSIMILE

SF1 IOT

sEF?vlcE

Manua’-

Precautions

Specification

Operating Instructions

Disassembly and Reassembly

Circuit Description

Troubleshooting

Exploded Views and Parts List

Electrical Parts List

9. PCB

10.

11.

12.

Diagrams Block Diagram Wiring Diagram Schematic Diagrams

1 Precautions

Follow these safety,

l-l Safety Precautions

ESD,

and servicing precautions to prevent personal injury and equipment damage.

Be sure that all built-in protective devices are in place. Restore any missing protective shields.

Make sure there are no cabinet openings through which people- particularly children- might insert fingers or objects and contact dangerous voltages.

When re-installing chassis and assemblies, be

sure to restore all protective devices, including control knobs and compartment covers.

Design Alteration Warning: Never alter or add to the mechanical or electrical design of this equipment, such as auxiliary connectors, etc. Such alterations and modifications will void the manufacturer’s warranty.

Components, parts, and wiring that appear to have overheated or are otherwise damaged should be replaced with parts which meet the original specifications. Always determine the cause of damage or overheating, and correct any potential hazards.

Product Safety Notice: Some electrical and mechanical parts have special safety-related characteristics which might not be obvious from visual inspection. These safety features and the protection they provide could be lost if a replacement component differs from the original. This holds true, even though the replacement may be rated for higher voltage, wattage, etc.

Components critical for safety are indicated in the parts list with symbols A A . Use only replacement components that have the same ratings, especially for flame resistance and dielectric specifications. A replacement part that does not have the same safety characteristics as the original may create shock, fire, or other safety hazards.

Observe the original lead dress, especially near sharp edges, AC, and high voltage power supplies. Always inspect for pinched, out-of- place, or frayed wiring. Do not change the spacing between components and the printed circuit board.

Samsung

Electronics

l-l

Precautions

1-2 ESD

Certain semiconductor devices can be easily

damaged by static electricity. Such components are commonly called “Electrostatically Sensitive (ES) Devices”, or integrated circuits, some field effect transistors, and semiconductor “chip” components. The techniques outlined below should be followed to help reduce the incidence of component damage

caused by static electricity.

CAUTION: Be sure no power is applied to the

Precautions

ESDs.

Examples of typical

ESDs

are:

chassis or circuit, and observe all other safety precautions.

Immediately before handling a semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, employ a commercially available wrist strap device, which should be

removed applying power fo the unit under fesf.

After removing an electrical assembly equipped with

conductive surface, such as aluminum or copper foil, or conductive foam, to prevent electrostatic charge buildup in the vicinity of the assembly.

Use only a grounded-tip soldering iron to

solder or desolder

for

your personal

safety reasons

ESDs,

place the assembly on a

ESDs.

prior

Use only an “anti-static” solder removal device.

Some solder removal devices not classified as

“anti-static” can generate electrical charges sufficient to damage

Do not use Freon-propelled chemicals. When

sprayed, these can generate electrical charges sufficient to damage

Do not remove a replacement ESD from its

protective packaging until immediately before installing it. Most replacement packaged with all leads shorted together by conductive foam, aluminum foil, or a comparable conductive material.

Immediately before removing the protective shorting material from the leads of a replacement

to the chassis or circuit assembly into which the device will be installed.

Maintain continuous electrical contact between

the

ESD

installed, until completely plugged or soldered into the circuit.

Minimize bodily motions when handling

unpackaged replacement

motions, such as the brushing together of clothing fabric and lifting one’s foot from a carpeted floor, can generate static electricity sufficient to damage an

ESD,

and the assembly into which it will be

ESDs.

ESDs

are

touch the protective material

ESDs.

Normal

ESD.

I-3

Lithium Battery Precautions

Exercise caution when replacing a Lithium battery. There could be a danger of explosion and subsequent operator injury and/or equipment damage if incorrectly installed.

Be sure to replace the battery with the same or

equivalent type recommended by the manufacturer.

1-2

Lithium batteries contain toxic substances and should not be opened, crushed, or burned for disposal.

Samsung Electronics

-c

2 Specification

2-1

Transmitter

Parameter

Document Size

Document Thickness

Scan Line Length

Effective Scanning Width Scanning Method

Resolution

Normal

Max. Min.

, I

Horizontal Vertical Horizontal Flat-bed scanning using Vertical Stepping motor Horizontal

Vertical Fine:

2lOx297mm 216

1500

l52x76mm

0.085

0.115

A4 paper,1 728 208 mm

203 pels/in (8

Standard:

Super Fine:

dots/mm)

3.85

7.7

15.4

scan elements along

lines/mm

Specification

CIS

(98

lines/in)

(196

lines/in)

(392

lines/in)

216

line length

2-2

Receiver

Parameter Coding Scheme Recording Paper Size Effective Recording Width Recording Method

Resolution

(Modified

216

mm x 30 m, core

208 mm

Solid state Thermal Printing Head

Horizontal

Vertical Fine:

8 dots/mm Standard:

Suoer

Fine:

Huffman)

12.7

(203 pels/in)

3.85

lines/mm

7.7

lines/mm

15.4

lines/mm

Specification

diametre

(98

lines/in)

(196

lines/in)

(392

lines/in)

Samsung

Electronics

2-l

Specifications

2-3

Line Control Block

Parameter Specification Communication Facility Line Coupling Transmission Speed Modem

Carrier Frequency

Control

Sianal

Output Level Input Sensitivity Input & Output Impedance

Public Switched Telephone Network Direct

9600,7200,4800,2400 bps QAM, DPSK

1 (V.29, V.27ter

1 1700

1 1800

1 1100

2100

300

bps

dBm

600

ohm f

and

with fall back function and

(9600/7200

(4800/2400

(CNG)

(CED)

(FSK)

to - 15 to - 43

30%

FSK

bps)

dBm +O.O I-3 dBm,

dBm

and -5

dBm

(PSTN)

V.21)

adjustable in 1 dB steps

-48 dBm

2-4

Others

Dialling Dialling

Signal Method

Parameter

Memory Capacity Power Requirement

Power Consumption

(

Temperature

Relative Humidity

Dimension

Stand-by In use

Width

Depth Height Weight

Specification

DP/DTMF

Memory

dialling, Redialling

5 memory dial (power on) Check power label attached near the power cord connection. 7 Watt Max.

115

Watt

150to95”F (lO”Cto35”C) I20

to 80 % RH (Non-Condensing)

1 290

(11.4

in)

245

(9.64

in)

109

(4.29

in)

3.0

2-2

Samsung Electronics

Operating Instructions

3-1

How To Enter Service Mode

In service mode (tech) mode, the technician can check the machine and perform various test to isolate the

cause of a malfunction.

To enter service mode, press MENU, #, confirm that the machine has entered service (tech) mode. While in service mode, the machine still performs all normal operations. To return to normal user mode, press ‘MENU, #, the power switch off, then on by plugging the power cord out, then in.

Options changed while in service mode do not remain changed, unless you first clear machine memory.

3-2

Changing Options

3-2-l

Selectable Options

GRAY SCALE LEVEL REMOTE RECEIVE CODE

Choose either 16 or 32 selected level is also used in the photo sending mode. If you select 32 levels, transmission time is longer, however the result at the receiving end will be superior. This mode works only when the remote machine is capable of super-fine mode.

CONFIRMATION REPORT PRINTOUT

gaey

scale levels. The

1,9,3,4

in sequence, and ‘TECH’ will be displayed in the LCD to

1,9,3,4’

This code can be used only with a phone extension connected to the FAX machine. The user can initiate FAX receive mode by entering a remote receiving code on the extension phone. The code is factory preset to * 9 * , and the middle digit may

be changed to any digit between 0 and

AUTO

IOURNAL

in sequence again, or turn

Select whether a confirmation report prints each time a user sends a fax.

YES: The machine prints out the report

automatically after each fax sent.

ERROR : The machine prints a report only when

there is an error.

NO: The machine does not print the report

automatically. User can print the list on demand.

RING BEFORE ANSWER

Select the number of rings the machine allows before it answers a call in mode.

automa

tic receiving

The fax machine prints the TX/RX journal automatically after every 50 fax sessions.

MODEM SPEED

Select baud rate of The lower the baud rate, the larger the acceptable error rate. bps in the protocol mode. When the TX speed is set to

V.29

2400

T30

9600

V.27 ter.

bps, the RX speed will be V.27

9600,7200,4800,

protocol has a fixed speed of

7200

bps, the RX speed will be either

When the TX speed is set to

2400

ter.

bps.

300

4800

Samsung

Electronics

3-l

Operating Instructions

CALL TRANSFERRING

This feature allows the fax machine to transfer incoming caller’s message to a specified remote location.

Choose YES to turn on this feature. The LCD display asks to enter the telephone number you want to be transferred. Choose NO to turn off the feature.

CALL MONITORING

This feature enables you to hear callers leaving

messages on the machine.

Choose YES to turn on this feature. Choose NO to turn off this feature.

CHARGE SAVER

This feature lets the user dial into this machine from a remote phone and check whether anyone has left a message without being charged for a charge call. When charge saver is on and there are messages waiting to be heard, the machine answers on the number of rings you specify in the ring count option. If there are no messages, the machine answers on the second ring after the

number specified. This gives the user time to hang up the phone before the machine answers - and

saves the price of the call.

REMOTE PASSWORD

You can change the three-character password used to access your machine from a remote phone. The password is preset to nine pound) at the factory. The first and the last

##‘s

are fixed, but you can change the middle numbers from 0 to 9. The machine doesn’t accept double character codes passwords, because line conditions can occasionally make the machine fail to recognize a double digit code.

Enter the characters you want to use, then press

START.

“#139#”

(pound one three

(ex

119,229 etc.> as

BATTERY ALARM

You can turn on the battery alarm feature. With

this feature on, the machine displays the low

battery message in the LCD and sounds beeps to

alert you low battery condition.

Choose YES to turn on the battery alarm feature. Choose NO to turn off the battery alarm feature.

CHECK BATTERY

If you want to check the remains of the battery, press START button. The machine displays the remaining capacity of the battery in the LCD.

Choose YES to turn on charge saver. Choose NO to turn off charge saver.

MESSAGE RECORDING TIME

You can select the maximum time allowed for

caller messages and memos.

If you choose YES, the LCD display shows you the time limits available : 0 second, 30 seconds, seconds or 90 seconds. Choose the proper time. If

you choose 0, it allows callers to hear the greeting message but doesn’t permit them to leave

messages.

3-2

LINE MONITOR

You can hear line signals through a tone speaker.

The volume is adjustable.

Choose YES to monitor the line signal. Choose NO to turn off this feature. Speaker will be

active only for dialing, the starting part of the

phase B of CCITT, and key tones.

TRANSMISSION LEVEL

You can set the transmission level to between

0 and

-15

dBm in 1 dB steps using the control panel keypad. Accuracy is + 0

/-3 dBm.

Samsung

Electronics

Operating Instructions

RECEPTION LEVEL

Reception level may be too low due to cable losses. If set to between 0 and If set to between -5 and

-43

dBm, reception sensitivity will be

-43 dBm.

-48

dBm, reception sensitivity will be

-48 dBm.

CABLE EOUALISZR

Copper telephone wire attenuates low frequencies less than high frequencies. The longer a cable is, the more pronounced the effect. To compensate for this attenuation you may need to set the machine to match the cable length currently used. Select short or long.

BUSY ON DROP OUT TIME

While checking busy on time, if any signal noise is detected, the machine will ignore the signal noise unless it is greater than a specified time.

RING ON CHECK TIME

The machine must receive a ring signal with a specified active time from a telephone exchange in automatic reception mode. In this case, the detection time that the machine agrees to be valid the

inputed

option. If the activation time of ring signal is below of the set value of the ring on check time, the machine can not detect this ring signal.

ring signal is changeable by this

RING OFF CHECK TIME

The machine have to receive a ring signal with specified inactive time as well as active time. This option is able to change the inactive time. If the inactive time of ring signal is above of the set value of the ring off check time and below of the set value of the “ring check maximum time”, the machine can detect this ring signal off

(Ol-99,1=10 msec)

RING CHECK MAXIMUM TIME

BUSY OFF DROP OUT TIME

While checking busy off time, if any signal noise is

detected, the machine will ignore the signal noise unless it is greater than a specified time.

FLASH TIME

This feature allows you to change the flash time.

BUSY TONE DETECTION LEVEL

While checking tone in ANS/FAX mode, If any signal which is great than set level is detected for a few seconds the machine will disconnect the line.

PAUSE TIME

Adjust the period of pause time to wait for a second dial tone in a PABX or mobile paging system. You can adjust the time from 1

9).

set

to 9 set

This option is able to change the inactive maximum time. If the inactive time of ring signal is above of the set value of the “ring off check time” and below off the set value of the ring check maximum time, the machine can detect this ring signal off. If the time is above of the set value of the ring check maximum time the previous ring counter is cleared.

(Ol-99,1=100

msec)

3-2-2 Changing Options

Press MENU, 3, START/COPY in sequence. Press

)

or 4 to select the desired option item. When

the desired option item appears, press START and use ) or 4 to change the status of a selected

function.

Samsung

Electronics

3-3

Operating instructions

3-3

Test Mode

Test mode is used to test machine functions. To enter test mode, press MENU, 0, START/COPY buttons in sequence.

TPH TEST

You can print a

sample test pattern.

TPH

test pattern and check the heating element of

Figure

3-1: TPH

Test Pattern

TPH

with this test pattern. Figure

3-1

is a

CIS TEST

You can check the scanning elements of the CIS (Contact Image Sensor) and print a shading waveform graphically with dots. The graph waveform will resemble figure

3-2,

below.

CIS TEST

Figure

3-2: CIS

Shading Waveform

3-4

Samsung Electronics

Operating Instructions

“c

MODEM TEST

The modem will send various transmit signals on the telephone line. You can check the following:

FSK

test

l tones:

3-4

A number of useful reports can be printed in service mode. One of these lists is the protocol list, which contains detailed information which may be required when contacting technical support. To print this list, press MENU, 4, START/COPY in sequence.

1100

Hz,

1650

Hz,

training:

9600,7200,4800,2400

Report Printout

1850

Hz,

2100

bps

ROM TEST

Tests machine ROM (Read Only Memory). The result and the software version appear in the LCD in the following format:

CHKSUM= XX, VXX, OK

MEMORY CLEAR

Erases contents of RAM. When memory is cleared, the machine returns to default settings.

When a report name appears in the display, scroll through the list of reports by pressing ) or 4. When a desired report is selected, press START/COPY.

CONFIRMATION REPORT

Shows the last transmission result.

VOICE STATUS REPORT

Shows the status of the recorded voice messages.

TRANSMISSION

Shows information about faxes sent.

RECEPTION

Shows information about faxes received.

TELEPHONE NUMBER LIST

Lists all numbers stored in the machine’s onetouch and speed

TOURNAL

IOURNAL

dialling

memory.

SYSTEM DATA LIST

Shows all options that were set in user mode and service mode.

PROTOCOL LIST

This list is available in the service mode only, and shows the sequence of the CCITT group 3 protocol during the most recent TX or RX operation. You can check for send and receive errors with this list.

If a communication error occurs while the machine is in service mode, the protocol list will print automatically.

HELP LIST

This report illustrates the machine’s basic functions and commands. Use as a quick reference guide.

T.30

Samsung

Electronics

3-5

Operating Instructions

3-5

LCD

Disdav

3-5-l During communication

In user mode, the LCD shows the remote machine’s TTI number, communication type, (send or receive), and page number.

In service mode, the display shows the

communication type, abbreviations for the CCITT

Group 3

type and line time.

T.30

(G3),

coding type

protocol as they occur, the protocol

(MH),

baud rate in kbps,

3-5-2

If a communication problem

occurs:

In user mode, the display shows one of the following reasons: PAPER JAM, SEND ERROR, or RECEIVE ERROR.

In service mode, the display shows all error messages available in user mode, as well as additional error messages not available in user mode.

Error messages shown in service mode only are as follows:

PRE-MESSAGE ERROR:

problem occurred during phase B of session MESSAGE ERROR:

problem occurred during phase C of session

POST-MESSAGE ERROR: problem occurred during phase D of session

LINE ERROR: machine cannot connect or has lost connection with the remote machine

Additional messages, not shown above, will appear in the transmission and reception journals printed in service mode.

3-6

Samsung

Electronics

Disassembly and Reassembly

Note: Make sure power is OFF, and unplug the power cord from the wall outlet.

4-l

Handset

Disconnect the handset cord modular plug from

the machine.

l Remove the two rubber dummies from the

holes and loosen the two screws.

Push the upper cover in the direction of arrow

to remove.

4-2

TX Guide & White Roller

l Open the operation unit assembly. l Disengage the stopper.

l Remove TX guide. l Remove white roller.

Figure

4-1

4-2

Samsung

Electronics

4-l

Disassembly instruction

4-3. TOD

Loosen the six screws fastening the top cover.

l Carefully lift the top cover as shown in the

Cover

direction of the arrow.

Figure

4-3

4-4. OPE

l Disconnect the harnesses from the Main l Loosen the two screws fastening the Main

l Disconnect the harnesses from the

l Remove the OPE unit from the base unit.

Unit

LIU PBA.

PBA.

Main PCB

Figure

4-4

4-2

Samsung Electronics

Disassembly Instruction

4-4-l. OPE

l Loosen the seven screws fastening the OPE

unit.

l Carefully lift the OPE cover in the direction of

the arrow as shown.

Cover

Figure

4-5

4-5.

Main Frame

l Loosen the screw fastening the power supply

and earth harness.

l Loosen the five screws fastening the main frame

assembly.

l Lift the main frame assembly and D.DET sensor

PBA.

Figure

4-6

Samsung

Electronics

4-3

Disassembly Instruction

4-6. LIU PBA &

l Loosen the six screws fastening the

POWER SUPPLY

and Power Supply unit.

l Lift the

LIU PBA

and Power Supply unit.

LIU

PBA

Figure

4-7

4-4

Samsung Electronics

Circuit Description

5-I General

The main circuit board consists of memory, MODEM, TX- and RX-related circuitry, TAD, and the Integrated Facsimile Controller

(IFC),

which includes the CPU and I/O device drivers and controls the system.

5-2 IFC

This circuit consists of the data and address bus, real time clock controller, Thermal Print head controller,

IFC

including I/O port, and system reset circuit.

5-2-l Memory Map

The external memory of the CPU is divided into

32kB

RAM

(FFOOOOH

FFFFFF

(OOOOH

through

ROMcsn

through

FFFFFFH).

SOOOH)

and

64kB

ROM

(RTC),

,#,’

,**’

,*’

image sensor, motor driver

,,*’

”

Reserved

Setup

Registers

Operational

Registers

OOFEFF OOFEEO

OOFE80

FOOOOO

OFFFFF

000000

Not

Available

CSOn

Figure

5-1: XFC

-jiyq;

Memory Map

DBCMC

Buffer

Dither Table

OOFEOO

OOFDFF OOFDCO

OOFD80

OOFDOO

F B80

OOEOOO

Samsung

Electronics

5-l

Circuit Description

5-2-2

Data & Address Bus Control

5-2-3

System Clock

/RD

and

/WR

signals are active in the low state,

with TSTCLK high, and an internal wait state

occurs in the TSTCLK (6 MHz). These signals are sent to the

/RD

and

/WR

ports of RAM , ROM, and the MODEM in order to read or write data when a chip select line is active.

/CSO:

RAM chip select active (low)

/ROMCS: /MCS:

DO -

A0 - A19:

ROM chip select active (low)

MODEM chip select active (low)

D7:

8 bit data bus

address bus

COMMUNICATION

STB O-3

PRINTER

DATA

CONTROL

AND

SENSORS

PDAT

PCLK

PLAT

THADI

The 6 MHz internal clock frequency is generated by dividing the 12 MHz system clock from

MODEM by two inside the MODEM.

IFC(XFC-6)

IROMCS IRAMCS

IRDIWR DO-D7

AO-A17

RTC

CRYSTAL

)

EXTERNAL

BUS

Figure

5-2: XFC

IRDIWR DO-D7

AO-A4 IMCS IMIRQ

SYSCLK

IPWRDWN

REST0 IBATRST

Hardware interface Signals

MODEM

5-2

Samsung

Electronics

Circuit Description

5-2-4

Real Time Clock

(RTC)

minutes, seconds, year, month, and day. A battery maintains operation when power is off.

XFC-B

co=6~~~

can up-track 32 years, beginning with

co=12

LEAP YEAR

DECODER

co=6k[z

5 BIT

CO=24

DRIVER

I(r

This circuit receives clock pulses from an external

32.768 kHz

crystal, which it divides into hours,

5BIT

1Hz

SECONDS

CO=28,29,

30,0r

32768 KHz

BUSY FLAG CLEAR BUSY FLAG

BIT

PRESCALER

6 BIT 1

4 BIT

MONTHS YEARS

1992.

5-2-5

Print Control

The

PCLK

and

print data to the

PDAT

signals synchronise serial

TPH.

PLAT latches TPH serial

Figure

5-3: RTC

print data to the TPH from a shift register through

PDAT.

STBl - STB4 enable TPH printing in four

sequential intervals.

Cmd

(MSINT

PrintLine

Cary-out)

Shifi

Data

Shift

Clk

IIIIlIIIIIIIIllI

Block Diagram

This system has a determines

STB

High/Low enable status

according to the STBPOL signal.

Cmd

wiiiiiiiiir

lOms/Line

printing format and

llllllllulllllll

Samsung

STBl

STB2

Electronics

Figure

5-4:

Printer Timing

5-3

Circuit Description

5-2-6 TPH

The

ADC

filter, and 9 bit up/down counter. The 6

A/D Converter

is composed of a 6 bit DAC, comparator,

MSBs

the 9 bit counter generate a reference signal to the comparator. TPH temperature or DTAD back-up voltage is sensed by comparing

THDI

DAC

output

DAC

out

Comparator

voltage to the comparator with the thermistor input voltage

output signal from the proper strobe pulse to the input voltage

(THDI),

(THDI)

which originates as an

TPH.

It then supplies the

TPH.

The thermistor

operates within a range of 1

to 4v.

Counter

Clock-------i

MSBs

Battery

I I

Approximate values

Figure

(TPH

5-5: ADC

Block Diagram

Temperature) of

R28

and

R29

can be calculated

from the following formulas:

R28 = 0.25 R29 = (15Rth

(R29

(Tl) x

Rth (Tl)} / (R29

Rth

(T2)}/

{Rth

(Tl)

Rth

(Tl)}

-16Rth (T2))

Where Tl = minimum temperature, T2 = maximum temperature.

THDl

GND5

5-4

Figure

5-6:

THD Connection Circuit

Samsung Electronics

5-2-7

Operation Panel Control

Communication

A Synchronous/ Asynchronous Receiver/Transmitter transmission between the main circuit board and the operator panel.

(SART)

CPU Bus

controls serial data

SclkCtrlLo

SclkCtrlHi

Circuit Description

Band

Gen (8x)

Tx/Rx Control

IRQ

control

SARTCmd

Figure

5-7:

SART Block Diagram

) SartlRQ

RxShift Reg

(SARTData)

RxBuffer

---)(j SCLK

RXD

Samsung

Electronics

Circuit Description

5-2-8

Image Sensor

The shading wave is formed by scanning the white roller prior to a document. The slice level is

determined by the shading wave, and

Shading Correction

‘+,,-I

Inversion

Mutiplier

enhancement

Table

8x6

’

--p=’

Shade

RAM-

FADC

-*--------------------i---------~------------------------------O

! _ _ _ _ -#A _

Gray Scale

Image

compensates for shading distortion according to

the

CIS

characteristics. The wave format from the

CIS

is converted into a 6 bit digital value in the image processor, and then processed in B/W or intermediate mode.

____________

Texf

mode image

External

IFC

Inversion Table

Shading Enabled (ShadeEnb)

Edge Enhancement Enabled (EdgeEnhEnb)

Dynamic Background and Contrast Control

Enabled (DBCCErr~

Enabled

Figure

(ShTbEnb)

5-8:

Scanner Image Processing Block Diagram

- - - - -

Primary Paths

Secondary (optional) Paths

External Video Processing Data Input

5-6

Samsung

Electronics

Circuit Description

5-2-9 CIS

Input Processor

Processing to compensate for

CIS

shading

distortion is controlled with MUXA ‘low’ and

To process the B/W input signal, maximum

(+VREF)

and minimum (-

VREF)

values of the CIS

input signal are controlled by calibrating MUXA

and

MUXB

in the high state for the maximum

MUXB ‘high’. For B/W mode, MUXA should be

‘high, and MUXB ‘low’. For half-tone, MUXA is ‘low’, and

MUXB

is ‘high’.

level, and setting them to earth for the minimum level.

XFC-B

Scanner Image

Processing

[

External Circuits

. . . . . . . . . . . . . . . . . . ,

Shading RAM

z................;

: External

;

RAM :

i....*...........(

{

Line Buffer

. RAM

*.................

i i

Scanner

r--l

5-2-10 CIS

The

CIS

driver clock frequency is

Figure

Driver

5-9:

250 kHz.

Scanner Interface Block Diagram

75%

duty cycle is used to lengthen the charging time. A

250 KHZ (L:DUTY 75%)

CLOCK

4------------------------------------------------*:

1 LINE

start signal is provided every 10 ms to match the line scanning time. Actual image signal is provided in less than

6.8

ms, using the

250 kHz

clock and taking A4 paper size into consideration.

Samsung

Electronics

5-7

Circuit Description

5-2-11 l/O

Port Table

I/O

0 0 0

I I

MODE DETECT SENSOR OPEN

I 0 0 0

SIO SIO SIO

ACTIVE STATE

SPEAKER DISABLE SPEAKERENABLE

CML

RELAY ON (FAX)

DSP

HIGH BYTE SELECT

MODEM TX PATH DSP OGM

TPH TEMPARATURE

MIC.

OFF

ICM

RECORD PATH

OPE MICOM

DSP

RESET

DSP

DATA PUMP DISABLE

TPH

POWER

CHECK

(+24 V)

(H)

ACTIVE STATE

CML RELAY OFF (TEL)

DSP

LOW BYTE SELECT

RING DETECT

DSP

ACKNOWLEDGE

TX PATH

MODE DETECT SENSOR CLOSE

DTAD

BACK-UP BATTERY CHECK

MIC.

OFF

ICM

RECORD PATH

OPE MICOM

DSP

DATA PUMP ENABLE

TPH

POWER

(+24 V)

(L)

OFF

116

115

106 105 104 103

GPO2 VOL-B

GPO 3

GPO 4 GPO 5 GPO 6 GPO 7

VOL-c

MPA

MPB /MPA /MPB

0 0

MOTOR PHASE A MOTOR PHASE B

MOTOR PHASE - A

MOTOR PHASE - B

5-8

Samsung

Electronics

5-2-l

2 Motor Controller

The

SFllOT

performs sending, receiving, and printing functions utilising a single 24 volt motor. This motor has a

150

ohm winding resistance.

Three drive strobe pulses operate the motor.

Table

5-l 1:

Motor Functions

Circuit Description

5-2-l

3 Miscellaneous Signals

The key click consists of an

800

Hz tone of 20

duration.

/REST0

drives MODEM

(/PORI),

UART and serves to reset the MODEM, UART.

/MIRQ

is the MODEM interrupt signal.

(/POR)

i’+

Motor Function Drive Strobe

Swing Gear Control

Document Out 1oopps

Super Fine Mode

Other

XOUT

BATRSTn j

100 pps

1oopps 1oopps

2 phase

ok (TSTCLK)

Watchdog Reset

(1-2 Reset clocks)

Lockout

2 phase

l-2

phase

5-2-l 4 Reset

Two power resets and a watchdog timer in the comprise the elements of this circuit. Battery power reset

(

battery-powered logic, and primary power reset

(/PWRDWN) initialises non-battery-powered

logic when system power is supplied.

to battery (BadwpConllg)

(/BATRST)

Power up Delay 2

TSTCLKS)

~ntemal logic -

Clock enable

loCkout

IFC

is used to initialise the

RESETn

R-S”

set mstate

Figure

5-12:

POWER MONITOR

If 5V power to and

4.35V

indicated and the output of

(GND).

This causes the

(‘low’=reset). IFC/RESET terminal to be reset. The output

terminal of configuration, and is connected to

10k

pull-up resistor.

Samsung

KIA7045P

(typically

The

IFC

KIA7045P

Electronics

drops to between

4.5V),

power failure will be

KIA7045P

IFC

to become active

will go ‘low’

reset causes the MODEM

is an open-drain

PFC

through a

Trlstate

Control

Power Reset Block Diagram

WATCH DOG TIMER

4.65

This programmable counter in the every 2

ms.

automatically reset and switches to initialise mode.

BATTERY POWER RESET

When battery power (VB) is applied to

time, VB

causing a reset to occur.

CUrrent

If not reset after

ESLIltS in

/BATRST going ‘low’,

250 ms,

IFC

is reset

the system is

IFC

the first

5-9

Circuit Description

5-3

Memory

System memory consists of

64kB

ROM and

32kB

RAM. Ail of RAM is backed up. ROM and RAM are

selected by chip select lines, and data is accessed by the units position of the byte.

c5V power is applied to RAM through lk

resistor in series with the positive battery terminal is for battery protection.

5-4

Modem and TX- and RX- Related Circuits

These circuits control signal transmission between the internal MODEM and the

VB.

The

SFllOT

model facsimile machine uses a Li(thium) battery. A

LIU

or a remote MODEM.

The R96DFXL MODEM is a single-chip fax-MODEM having features to detect and generate

TX OUT is the MODEM output port, and RX IN is the input port. MODEM initialisation at system power on. DO - D7 are data buses. signals which determine the mode.

/MCS

is the chip select signal,

control signals. RLSD is used for v.24 interface-related signals and

Refer to Figure

PIN NO PIN NAME

100

1 2

3 4

75 76 94

GP 03 GP

5-14

for available R96DFXL I/O ports.

CIRCUIT NAME

HT-BI

HOOKDET2 I

OFF-RST

RX-CTRL

-GLED

I/O

0 0

I I I I I I

ACTIVE STATE

HALFTONE MODE

OPE

RESET

RX PATH

CIS LED ON

/PORI

is the

IFC

signal which enables

RSO-

RS4 are internal register select

/RD

and

/WR

are the read and write

/MIRQ

(H)

is the MODEM interrupt.

DESCRIPTION

BINARY MODE

EXTERNAL TEL. IN USE

REMOTE PATH

CIS LED OFF

DTMF

tones.

5-10

Samsung

Electronics

Circuit Description

5-4-I Transmit Circuit

This circuitry controls transmission of analog In receive mode, analog signals from the signals from the MODEM. Output voltage from the MODEM is buffered through the and OP amp after signal smoothing and filtering, and finally output to the line.

5-5

TAD

TAD circuit consists of a voice coprocessor to record and play voice messages in voice memory.

LIU

board and smoothing filter.

5-5-l Recording Path

R55

provides power to the condenser microphone. Voice signal from the microphone is passed through active filter to clear and amplifying the signal. Q5 and Q2 compose

ALC

(U22)

converts the digital signal from voice coprocessor into analog for line output.

aliasing

(Automatic Level Control) circuit. CODEC

converts the voice signal to digital and

U15, R117

noise occuring while sampling

and

C96, R82, C58

5-4-2

Receive Circuit

board are transferred to RX IN through the

5-5-3

Line Input and Play Path

Incoming signals from line are stored in the voice memory (4 M DRAM) through CODEC and DRAM controller. When played, the data stored in voice memory and sends it out to

LIU

through CODEC and

through the speaker, speaker through amp.

R108,

DSPG

MUX

DSPG

R108.

To playback

sends the signal to

(U12, U14),

LIU

BPF

DSPG

processes

and op

5-5-2 Mic

Transmit path functions as Outgoing messages and memo messages from

CODEC

DRAM) through the

Input Path

MIC

input path.

are stored in the voice memory (4 M

DSPG

DRAM controller.

5-5-4 DSPG

This circuit consists of Host Interface, Memory

Interface, CODEC Interface, and

Interface sends and receives data to and from

Memory Interface sends and receives the

compressed voice data to and from DRAM to play back and record voice data. communicates with host

Interface.

5-5-5

Voice Backup

+5V

is supplied for voice memory through VBT when power is on. When power is off, supplied from the 9V backup battery.

IFC

DSP

core. Host

DSP

core

through Host

+5V

IFC.

Samsung

Electronics

5-11

Circuit Description

5-6 LIU PBA

The

LIU

(Line Interface Unit) interfaces the MODEM and telephone to the telephone line. The FAX and telephone portions of the telephone circuitry operates, powered by telephone line voltage. The FAX portion of interface between MODEM and telephone line, and the circuits for DC loop feeding, DP signal, loop current, and ring detect. The telephone portion is divided into ringer, Schemetic and Wiring Diagram sections of this manual. Refer to

LIU

are active with machine power on. When machine power is off, only the

LIU

consists of the

dialling,

and speech circuits. Refer to the

LIU

circuit and Block Diagrams.

5-6-l FAX section

MODEM/ LINE INTERFACE

This is the path for data and remote control signals.

CML201

FAX and telephone circuits.

U201

Single ended input from transformer

U201

Output for driving transformer AC impedance larger than 10 kohm.

C202: DTMF kohm winding under idle conditions and DC

blocking for 20 kohm winding.

l AC impedance: The AC impedance of

LIU)

(C215)

input) port. With external resistor pin 34

ohm.

output) port is an N-channel open-drain output

to control the external high power shunt

transistor for synthesizing AC and DC

impedances.

l DC conditions: Normal operating mode is from

15 mA

reduced performance is 5 mA to 15 mA. In the

line hold range from 0 mA to 5 in a power down mode and the voltage at

pin 37 LI (Line Input) port is reduced to a

maximum of 3.5 V. The DC characteristic is determinedby the voltage at and a Pin 39 LS port. It can be calculated by the equation:

VL~

relay: switches telephone line between

pin 3 TIT (Telephone Input Transformer):

(T202).

pin 3 ROT (Receive Output Transformer):

(T203)

with an

and CNG detect path to

T20120

U201 (I-

is set to

U201

1000

ohm by external capacitor

U201

pin 8 CI (Complex Impedance

(R249)

AC1

port it can be programmed to

pin 35 CS (Current Shunt control

100 mA.

An operating mode with

mA,

600

the device is

U201

pin 37 LI port

R215

resistor between

VLI

ILINE

R215

U201

pin 37 LI and

U201

RING DETECT

U201

pin 28 (MO) is the ring tone output port and

drives

Q207,

which drives FET202 and the buzzer. The driving signal of the applied to photo coupler

LLC

(Line Loss Compensation)/LOOP

U204.

piezo

buzzer is

CURRENT DETECT

l The

LLC

is a pin option. When activated, the

transmit and receive gains for input and output are decreased by 6 when

U201

pin 31

dB.

Line current is 20

LLC

is connected to

AGND

and 75 mA when this pin is connected to The

LLC

is deactivated when

connected to

l When the

Vss.

CML201

relay or hook switch

switches to telephone line,

LLC

U201

pin is

on the

LIU

board and U6 on the Main board start communication.

U201

sends

<Ack>

message

which contains line current information. Using

this line current information, Main CPU can

recognize a parallel phone.

SERIAL INTERFACE

U201

pin 11 RXD : Schmitt

triger

input

(threshold = 2.5 V) to serial interface.

U201

pin 29 TXD : Open-drain output from

serial interface.

The communication is via a standard

Baud Rate

9600

UART:

Start Bit 1

Stop Bit 1 Date Bits 8 Parity Bit None

LSB

is transferred prior to

MSB

Vcc.

5-12

Samsung Electronics

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