Samsung SF_150TB_XEU Service Manual

FACSIMILE

SF150T

CONTENTS

1. Precautions

2. Specification

3. Operating Instructions

4. Disassembly and Reassembly

5. Circuit Description

6. Troubleshooting

7. Electrical Parts List

8. Exploded Views and Parts List

9. PCB Diagrams

10. Block Diagram

11. Wiring Diagram

12. Schematic Diagrams

FACSIMILE

SERVICE

Manual

Samsung Electronics Co.,Ltd. Mar. 1998.

Printed in Korea.

JF68-60936A

SF150T 1-1

1. Be sure that all built-in protective devices are

in place. Restore any missing protective

shields.

2. Make sure there are no cabinet openings

through which people- particularly children-

might insert fingers or objects and contact

moving parts or dangerous voltages.

3. When re-installing chassis and assemblies, be

sure to restore all protective devices, including

control knobs and compartment covers.

4. 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.

5 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.

6. 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.

7. 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.

8. Components critical for safety are indicated in

the parts list with symbols . 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.

1 Precautions

Follow these safety, ESD, and servicing precautions to prevent personal injury and equipment damage.

1-1 Safety Precautions

1. 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 for your personal safety reasons prior to

applying power to the unit under test.

2. After removing an electrical assembly

equipped with ESDs, place the assembly on a

conductive surface, such as aluminum or

copper foil, or conductive foam, to prevent

electrostatic charge buildup in the vicinity of

the assembly.

3. Use only a grounded-tip soldering iron to

solder or desolder ESDs.

4. Use only an "anti-static" solder removal device.

Some solder removal devices not classified as

"anti-static" can generate electrical charges

sufficient to damage ESDs.

5. Do not use Freon-propelled chemicals. When

sprayed, these can generate electrical charges

sufficient to damage ESDs.

6. Do not remove a replacement ESD from its

protective packaging until immediately before

installing it. Most replacement ESDs are

packaged with all leads shorted together by

conductive foam, aluminum foil, or a

comparable conductive material.

7. Immediately before removing the protective

shorting material from the leads of a

replacement ESD, touch the protective material

to the chassis or circuit assembly into which

the device will be installed.

8. Maintain continuous electrical contact between

the ESD and the assembly into which it will be

installed, until completely plugged or soldered

into the circuit.

9. Minimize bodily motions when handling

unpackaged replacement ESDs. Normal

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.

Precautions

1-2 SF150T

1. 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.

2. Be sure to replace the battery with the same or

equivalent type recommended by the

manufacturer.

3. Lithium batteries contain toxic substances and

should not be opened, crushed, or burned for

disposal.

1-3 Lithium Battery Precautions

1-2 ESD Precautions

Certain semiconductor devices can be easily damaged by static electricity. Such components are commonly

called "Electrostatically Sensitive (ES) Devices", or ESDs. Examples of typical ESDs are: 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 chassis or circuit, and observe all other safety precautions.

Parameter Specification

Coding Scheme MH (Modified Huffman)/MR (Modified READ)

Recording Paper Size 216 mm x 30 m; core diametre: 12.7 mm

Effective Recording Width 210 mm

Recording Method Solid state Thermal Printing Head

Horizontal 8 dots/mm

Resolution

Standard: 3.85 lines/mm

Vertical Fine: 7.7 lines/mm

Super Fine: 15.4 lines/mm

Parameter Specification

Normal 210 x 297 mm

Document Size Max. 216 x 1500 mm

Min. 152 x 76 mm

Document Thickness 0.085 x 0.115 mm

Scan Line Length Horizontal A4 paper,1728 scan elements along 216 line length

Effective Scanning Width Vertical 216 mm

Scanning Method Horizontal Flat-bed scanning using CIS

Vertical Stepping motor

Horizontal 8 dots/mm

Resolution

Standard: 3.85 lines/mm

Vertical Fine: 7.7 lines/mm

Super Fine: 15.4 lines/mm

SF150T 2-1

2 Specification

2-1 Transmitter

2-2 Receiver

Specifications

2-2 SF150T

Parameter Specification

Dialling Signal DP/DTMF

Dialling Method Manual; Memory dialling; Last Number Redialling

Memory Capacity 34 memory dial (power on)

Power Requirement Check power label attached near the power cord connection.

Power Consumption

Stand-by 7 Watt

In use Max. 115 Watt

Temperature 5 °C to 45 °C

Relative Humidity 20 to 80 % RH (Non-Condensing)

Width 278 mm

Dimension

Depth 211 mm

Height 107 mm

Weight 2.5 kg

Parameter Specification

Communication Facility Public Switched Telephone Network (PSTN)

Line Coupling Direct

Transmission Speed 9600, 7200, 4800, 2400 bps

Modem QAM, DPSK and FSK

(V.29, V.27ter with fall back function and V.21)

Carrier Frequency 1700 Hz (9600/7200 bps)

1800 Hz (4800/2400 bps)

Control Signal 1100 Hz (CNG)

2100 Hz (CED)

300 bps (FSK)

Output Level 0 dBm to - 15 dBm +0.0 / -3 dBm, adjustable in 1 dB steps

Input Sensitivity 0 dBm to - 48 dBm in two ranges

Input & Output Impedance 600 ohm

2-3 Line Control Blockk

2-4 Others

SF150T 3-1

3. Operating Instructions

3-1 Service Mode

In Service Mode, the technician can check the machine and perform various tests to isolate a machine

malfunction.

To enter Service Mode, press ÔMENU, #, 1, 9, 3, 4Õ in sequence, and ' ' will be displayed in the LCD to

confirm that the machine has entered Service Mode. While in Service Mode, the machine still performs all

normal operations. To return to normal User Mode, press 'MENU, #, 1, 9, 3, 4' in sequence again, or turn

the power off, then on by unplugging and replugging the power cord.

3-2 Changing Options

3-2-1 Selectable Options

CONFIRMATION REPORT

Select whether a confirmation report prints each

time a user sends a fax.

YES: The machine prints a report automatically

after each fax sent.

ERROR : The machine prints a report only when

there is an error.

NO: The machine does not print a report

automatically. User can print the list on

demand.

DIAL TYPE

Select the type of dial system to which the machine

is connected.

Select MF if connected to a tone dial system.

Select DP if connected to a pulse dial system.

Use ^ or v buttons to select, then press Start.

RING COUNT

Select the number of rings the machine allows

before it answers a call in automatic receiving

mode.

CALLER ID

This is the number of the person faxing you.

Choose YES to turn on Caller ID display.

Choose NO to disable.

REMOTE RECEIVE CODE

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 character

may be changed to any digit between 0 and 9.

AUTO PRINT

The machine prints a TX/RX journal automatically

after every 20 fax sessions.

MODEM SPEED

Select baud rate of 9600, or 4800 bps. The lower the

baud rate, the larger the acceptable error rate. T30

protocol has a fixed speed of 300 bps in the

protocol mode. When the TX speed is set to 9600

bps, the RX speed will be V.29. When the TX

speed is set to 4800 bps, the RX speed will be V.27

ter.

Operating Instructions

3-2 SF150T

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 toll 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.

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, 60

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.

REMOTE PASSWORD

You can change the three-character password used

to access your machine from a remote phone. The

password is preset to "#139#" (pound one three

nine pound) at the factory. The first and the last #'s

are fixed, but you can change the middle numbers

from 0 to 9.

Enter the characters you want to use, then press

Start.

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.

TAD SILENCE CHECK

In TAD mode, The machine decides the next

action when detected a silence of 10 seconds.

The actions are:

RX : Swiches to receive mode.

REC : Keeps the recording the silence.

CUT : Disconnect the line and returns to standby

mode.

TX LEVEL

From -9 dBm to -15 dBm is acceptable. You can set

the transmission level to between 0 and -15 dBm

in 1dB steps using the control panel keypad.

Accuracy is + 0 / -3 dBm.

CABLE EQUALIZER

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.

Operating Instructions

SF150T 3-3

LINE MONITOR

Allows you to monitor line signals through the

speaker.

RX LEVEL

Reception level may be too low due to cable losses.

If set to - 43 dBm, reception sensitivity will be

between 0 and - 43 dBm.

If set to - 48 dBm, reception sensitivity will be

between -5 and -48 dBm.

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.

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.

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.

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 0 sec to 9 sec

(0 to 9).

RECALL TIME

When a call comes in and you want to connect it to

another party, you can transfer the call by using a

timed-break recall funtion.

This funtion must make a properly timed break

authorized by the country. The machine can select

times of 100, 280, or 600 msat an accuracy of ± 10

ms of the setting.

MH/MR CODING

Selection the coding method used for picture

detail

MR = Use MR and MH coding.

MH = Use only MH coding.

RING ON CHECK TIME

The machine must receive a ring signal with a

specified active time from a telephone exchange in

automatic reception mode. The detection time that

the machine considers valid is adjustable via this

option. If the active time of the ring signal is less

than the set value of the Ring On Check Time, the

machine will not consider it a ring signal.

RING OFF CHECK TIME

The machine must receive a ring signal with a

specified inactive time, as well as an active time. If

the inactive time of the ring signal is longer than

the value of the Ring Off Check Time, the machine

will not consider it a valid ring signal.

3-2-2 Changing Options

Press ÔMENU, 3, Start/COPYÕ in sequence. Press

^ or v to select the desired option item.

When the desired item appears, press Start and

use ^ or v to change the status of the selected

option.

3-4 SF150T

Operating Instructions

3-3 Test Mode

Test Mode is used to test machine functions. To enter Test Mode, press ÔMENU, 0, START/COPYÕ in

sequence.

TPH TEST

The TPH test pattern checks the heating element of the TPH. Figure 3-1 is a sample test pattern.

Figure 3-1: TPH Test Pattern

Operating Instructions

SF150T 3-5

3-4 Report Printout

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.

When a report name appears in the display, scroll through the list of reports by pressing ^ or v. When a

desired report is selected, press START/COPY.

CONFIRMATION REPORT

Shows the last transmission result.

TX/RX JOURNAL

Shows information about faxes sent and received.

SYSTEM DATA LIST

Shows all option settings.

TEL. NUMBER LIST

Lists all numbers stored in the machine's One-

Touch and Speed-Dialling memory.

PROTOCOL LIST

This list is available in Service Mode only, and

shows the sequence of the CCITT group 3 T.30

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.

To print this list, press HELP (#).

MODEM TEST

The modem will transmit send various signals on

the telephone line to check the following:

¥ FSK Test

¥ Tone Test: 1100 Hz, 1650 Hz, 1850 Hz, 2100 Hz

¥ G3 training: 9600, 4800 bps

¥ RX Loop Test

¥ DTMF Test

ROM TEST

Tests machine ROM (Read Only Memory). The

result and the software version appear in the LCD

in the following format:

CHKSUM= VXX/XX, OK

ALL MEMORY CLEAR

Erases contents of RAM. When memory is cleared,

the machine returns to default settings.

Operating Instructions

3-6 SF150T

3-5 LCD Display

3-5-1 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 T.30 protocol as they occur, the protocol

type (G3), coding type (MH), baud rate in kbps,

and line time.

3-5-2 If a communication problem

occurs:

In User Mode, the display shows one of the

following reasons: CAM JAM, COMM. ERROR,

CHECK DOCUMENT.

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 only in Service Mode are:

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 TX/RX journals printed in Service

Mode.

SF150T 4-1

4. Disassembly and Reassembly

Note: Make sure power is OFF by removing the power cord from the wall outlet.

4-1 Tx Guide

¥ Open the operating panel assembly.

¥ Carefully lift the TX guide, as shown in the figure.

OPE Cover

TX Guide

Figure 4-1

Figure 4-2

4-2 Top Cover

¥ Loosen the 5 screws fastening the top cover.

¥ Carefully lift the top cover.

¥ Remove the wire harness from the base, as

shown in the figure.

Disassembly Instruction

4-2 SF150T

4-3. OPE Unit

4-4.

OPE Cover

¥ Loosen the 2 screws fastening the top cover.

¥ Carefully lift the OPE assembly, as shown by

the arrow.

¥ Loosen the 2 screws fastening the OPE chassis.

¥ Remove the Paper Empty sensor connector

from the OPE board.

¥ Remove the OPE unit from the OPE chassis, as

shown by the arrows.

Top Cover

OPE Unit

OPE Cover

OPE Chassis

Figure 4-3

Figure 4-4

Disassembly Instruction

SF150T 4-3

4-5. TPH

¥ Remove the TPH assembly from the OPE unit.

¥ Remove the TPH from the TPH assembly.

¥ Remove the TPH harness from the TPH

connector.

¥ Remove the TPH guide from the TPH.

¥ Lift the white roller assembly.

¥ Loosen the 2 E-rings fastening the main chassis

assembly.

¥ Remove the spring-lock.

¥ Loosen the 2 screws fastening the main chassis

assembly.

¥ Lift the CIS assembly.

¥ Remove the document guide from the CIS

assembly (2 screws).

¥ Remove the CIS guide from the CIS (2 screws).

OPE Cover

TPH Bracket

TPH Guide

TPH

Base Ass'y

Main chassis Ass'y

4-6. Main Frame

Figure 4-5

Figure 4-6

Disassembly Instruction

4-4 SF150T

4-8. BOARDS & POWER SUPPLY

LIU PBA

MAIN PBA

BASE

POWER

¥ Remove the handset modular harness from the

LIU board.

¥ Loosen the screw fastening the LIU board and

carefully lift the LIU board as shown by the

arrow.

¥ Loosen the 3 screws connecting the main and

daughter boards. Lift the rear bracket.

¥ Loosen the screw fastening the daughter board

to the base. Lift the daughter board.

¥ Loosen the 2 screws fastening the power supply

to the base. Lift the power supply and the main

board to remove them.

¥ Lift the modular jack and the earth spring.

¥ Lift the white roller assembly.

¥ Loosen the 2 E-rings fastening the main chassis

assembly.

¥ Remove the spring-lock.

¥ Loosen the 3 screws fastening the main chassis

assembly.

¥ Lift the CIS assembly.

¥ Remove the document guide from the CIS

assembly (2 screws).

¥ Remove the CIS guide from the CIS (2 screws).

4-7. CIS

Figure 4-7

SF150T 5-1

5. Circuit Description

5-1 General

The main circuit board controls the machine, and consists of Super Fax Chip (KS16118), External memory,

CODEC circuit with modem-TX and RX signal path and some parts of the Line Interface Unit, Digital TAD

circuit with DSP amd DRAM, witch controls the system.

5-2 System Control Section

This circuit consists of the EP-ROM and SRAM, external Real Time Clock crystal, RTC and memory back-up

circuitry, and the Super Fax Chip (KS16118).

The KS16118 Super Fax Chip is an integrated 9600 bps modem, image processor, 8-bit MPU, peripheral

controller, and analog front end circuit on a single-chip.

Peripheral functions inculde 2-channel SI0, 3-channel DMA, 6-bit Half flash A/D converter, scanner and

video processor units, TPH interface, CODEC unit, and tone generator.

Modem is a 9600 bps, half duplex monolithic device incorporating digital filters, a Samsung SSP1600 digital

signal processor and CPU-Interface logic.

Figure 5-1: KS16118 External Memory Map

1FFFH

0100H

00FFH

0000H

FFFFH

FF80H

FF7FH

FF00H

FEFFH

/DMS

(SRAM)

Peripheral

PCS0

DSP /CS

PCS1

Interrupt

Vectors

/PMS

(EP-ROM)

[ Program Memory ]

[ Data Memory ]

5-2-1 Memory Map

The external memory of the CPU is devided into, 1 byte(FF00H) DSP chip select, 32kbyte SRAM (0000H

through 7FFFH) and 128kbyte EP-ROM (0100H through 1FFFH).

Circuit Description

5-2 SF150T

Figure 5-2: XFC Hardware Interface Signals

5-2-2 lExternal Chip Control

KS16118 internal logic generates chip select signals for both memory chips and peripherals.

To support external access, from one to three wait cycles can be inserted under program control during

external access.

A chip select signal line goes active (low) whenever its corresponding device is accessed over the external

interface. The peripheral addresses are located in data memory space.

/DMS : SRAM chip select active (low)

/PMS : EP-ROM chip select active (low)

/PCSn : Peripheral chip select active (low)

D0 - D7 : 8 bit data bus

A0 - A15 : address bus

5-2-3 System Clock

The 12 MHz internal system clock frequency is generated by dividing the 24 MHz clock.

OPERATING

PANEL

PRINTER DATA

CONTROL AND

SENSORS

MOTOR

DRIVER

(MOTOR)

SCANNER

CONTROL

AND

PROCESSING

RTC

CRYSTAL

DATA

MEMORY

PROGRAM

MEMORY

GENERAL

PURPOSE I/ 0

OP00-OP06

LED_CTL

LCD_EN

OPI0-OPI3

STB 0-3

PDAT

PCLK

PLAT

THADI

SM0-SM3

MODE

CLK1

Vin

+Vref

-Vref

XIN

XOUT

/DMS

/RD /WR

D0~D7

A0~A14

/RD

D0~D7

A0~A15

A16

/PMS

RESTOUT

/RESET

KS16118

Circuit Description

SF150T 5-3

Figure 5-4: Printer Timing

5-2-4 Real Time Clock (RTC)

This circuit receives clock pulses from an external

32.768 kHz crystal, which it divides into hours,

minutes, seconds, year, month, and day.

A battery maintains operation when power is off.

KS16118 can up-track 100 years, begining with

1992.

5-2-5 Print Control

The PCLK and PDATA signals synchronize serial

print data to the TPH.

PLAT latches TPH serial print data to the TPH

from a shift register through PDATA.

STB0 - STB3 enable TPH printing in four steps.

This system has a 10ms/line printing format and

sets STB High/Low enable status

according to the STBPOL signal.

PDATA

PCLK

PLAT

STB0

STB1

STB2

STBWID

[0:11]

STB0FF

[0:11]

STB3

Figure 5-6: THD Connection Circuit

GND5

THD1

+5V

Rth

(T)

TPH

Thermistor

5-2-6. A/D Converter (Scanner & TPH

Temperature)

Using a half-flash conversion technique, the 6-bit

A/D converter supports a 0.8µs peak conversion

time and dissipates only 7mA, maximum.

The half-flash unit uses 16 comparators, a most

significant 3-bit ADC, and a least significant 3-bit

ADC.

If the analog input voltage is greater than +Vref,

the A/D conversion result is 3FH.

If the analog input voltage is less than -Vref, the

A/D conversion result is 00H.

A/D conversion register, ADCON (19H), is used

to select an internal or external source for the A/D

converter, to enable or disable the converter, and

to select the operating mode (H: ADin 1 (Scanner),

L: ADin 0 (TPH)).

Circuit Description

5-4 SF150T

5-2-7 Operation Panel Control

Communication

The Operation Panel is controlled by the Port 1,

Port2, and Port 5 registers.

Port 1 (E2H) is a 4-bit general output port for LCD

display data.

This port can be configured for normal data (P1.4-

P1.7) or alternately as internal MODEM V.24

interface output signals (P1.0-P1.3).

Port 2 (E4H) is an 8-bit port with both input and

I/O pins.

P2.0-P2.3 are input ports for OPE key scan data,

and P2.6-P2.7 are not used for SF150T.

Port 5 (EAH) is an 8-bit port with both output and

I/O pins.

P5.0 and P5.4 are used for LED control and LCD

enable.

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 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 KS16118 image processor,

and processed in B/W or intermediate mode.

5-2-9 CIS Input Processor

To process the B/W input signal, maximum (+Vref)

and minimum (-Vref) values of the CIS input signal

are adjusted by calibrating KS16118 in the high state

for maximum level, and setting them to earth for

minimum level.

Shading correction uses a multiplier composed of a

9-bit sequential adder for simple H/W Logic.

5-2-10 CIS Driver

The CIS driver clock (CLK1) frequency is 250 kHz.

A 75% low duty cycle lengthens the charging time.

A start signal (SI) is provided every 10 ms to

match the line scanning time.

Actual image signal (VIN) is provided in less than

6.8 ms, based on A4 paper size using the 250 kHz

clock.

Figure 5-10: CIS Driver Clock Timing

250 KHZ (L:DUTY 75%)

CLOCK

SIG

1 LINE

Circuit Description

SF150T 5-5

5-2-11 I/O Port Table

High Bank Memory

DSP Inactive

DATA = 1

Active

DSP Reset

DSP High Byte

Normal

CIS LED On

High

OPE LED On

Normal

Open

No Paper

No Document

Normal

CODEC Serial Clock

CODEC Serial Data

CODEC Enable

Closed

Paper Exist

Document Exist

Incomming Ring

Active DSP Data Transfer

Low Bank Memory

DSP Active

DATA = 0

Inactive

Normal

DSP Low Byte

Low Battery

DSP Response Mode

Off

Low

OPE LED Off

No Barttery

Circuit Symbol

I/O

Pin No.

Port Name

High Low

A16

/DSP_CS

IRXD

ITXD

MOTOR A

MOTOR /A

MOTOR B

MOTOR /B

/CML2

/CML1

/24VCTL

DSPRST

DSPHL

/LOWBAT

DSPACK

/GLED

LEDCTL

/NOBAT

SCLK

SDATS

/SDEN

/HOOK DET2

MODE

P_EMPTY

D_DET

RING_DET

/DSPFLAG

P0.0

P0.1

P2.4

P2.5

P3.0

P3.1

P3.2

P3.3

P3.4

P3.5

P3.6

P4.1

P4.2

P4.4

P4.5

P4.6

P4.7

P5.0

P5.3

P5.5

P5.6

P5.7

P6.1

P6.2

P6.3

P6.4

P6.5

P6.6

PCS

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