Samsung SF 4700 Service Manual

SAMSUNG FACSIMILE

SF-4700

SERVICE

Manual

FACSIMILE CONTENTS

1. Precautions

2. Specifications

3. Installations

4. Disassembly

5. List of Abbreviations

6. Circuit Descriptions

7. Troubleshooting

8. Exploded Views & Parts List

9. Electrical Parts List

10. Connection Diagrams

11. Pcb Diagrams

12. Schematic Diagrams

ELECTRONICS

1. Precautions

1-1 Safety Precautions

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 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.

Components critical for safety are indicated in the parts list with symbols . Use only replace-

ment components that have the same ratings, especially for flame resistance and dielectric specifications. Areplacement part that does not have the same safety characteristics as the original may create shock, fire, or other safety hazards.

1-1

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

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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 chas-

sis or circuit, and observe all other 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.

1-2

Precautions

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2-1

2. Specifications

2-1 Printer Engine

2-2 Head

Technology

Speed Color

Mono

Resolution

Color Mono

Printing Width

Feeding Method

Automatic

Manual Tray Emulation Printer Driver Inter Face

Thermal Inkjet 2-pen & Print Head Swapping Type

4.5ppm at Draft Mode 9ppm at Draft Mode 600 x 600 dpi (1200 x 1200 dpi Addressable) 600

x 600 dpi (1200 x1200 dpi Addressable)

203mm 150 Sheets of 20lb cut sheets ( Max 15.5mm ) Yes Host Based Printing (GDI) Windows 98/2000 Driver IEEE1284

Babbage mono standard Birch color Print Head 208 nozzles 192 nozzles Ink type Pigment Dye Ink Color Black Color Ink Yield about 600 sh. about 200 sh.

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2-2

2-3 Facsimile

Specifications

(*3) Monochromatic CCITT NO. 1 CHART can be saved by 80 sheets per 1.0M Byte.

Compatibility Scan method Scan width Scan Resolution Scan Speed Feeding method ADF Guide Stacker Paper Tray Modem Speed Coding Method LCD

Resolution & Type

Contrast Capacity (*3) Back-up Time Confidential Forced Memory Tx. Memory Rx.

ITU-G3 CIS Max. 216mm, Effective: 210mm 300

x 300 dpi

9 sec Front input Front output(C-path) 30 sheets of 20lbs Document Input Guide Document Output Stacker/Paper Stacker Paper out Tray

14.4 Kbps MH, MR, MMR 2 Lines Each of 16 Characters

- Standard : 203

x 98 dpi

- Fine : 203 x196 dpi (Default)

- Superfine : 300 x 300 dpi Darkest/Darken/Normal/Lighten/Lightest

0.5 Mbyte user memory 15 sec (Continuous Power Failure) No Yes Automatic reception when paper empty.

GENERAL

SCANNING

MEMORY

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2-3

2-3 Facsimile (continued)

Specifications

Speed Dial Chain Dial On-hook Dial Last Number Redial Auto Redial Hold & Mute Pause Ringer Volume Tone/pulse Select DRPD TX/RX Journal Image TCR System Data Tel Number List Self Test Multipage Copy Gray Scale Reduction &

Enlargement Answering I/F Ext. Phone Sensors Real Time Clock RTI

50 Locations No Yes, 1-Key Yes, 1-Key Yes No Yes, Use Redial/Pause Key S/W Option Setting (4Steps) Tone only US : Yes, Other Country : No Yes Yes, Reduction of First Page Sent by Memory Tx Yes Yes Yes Upto 99 Pages 256 Levels 25%~200%

(Reference is the top center of Document) Yes 1-jack, Extension Phone Transfer Paper Jam Yes Yes

TELEPHONE

REPORT & LIST

COPY

TEL I/F

OTHERS

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2-4

2-4 Scanner

Specifications

Compatibility TWAIN Technology Platen CIS Light Source for Color CIS RGB LEDs (Line Order Control)

2-5 Power & Size

2-6 Accessaries

Power Source 110V~240V/50Hz~60Hz, Dimensions (W T D T H) 439 X 360 X 235 mm Weight 6.9Kg

Tel Line Power Cord FAX Driver Ink Cartridge Manual Carrier Sheet

1EA 1EA 1 CD - ROM INK-M50 (MONO) 1EA, INK-C60 (COLOR) 1EA Yes Yes (with Tick Mark : A5 Size)

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3-1

3. Installations

1. Pull the document tray upward. 2. Fold out the extender on the document tray.

3-1 Document Tray

3-2 Document Exit Tray

1. Insert the two tabs on the document exit tray into the slots on the front of your machine.

2. Fold out the extender, if necessary.

ocument exit tray

Extender

3-3 Telephone Line

Plug one end of the telephone line cord into the TEL LINE jack and the other end into a standard phone wall jack.

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3-2

Installations

3-4 Extension Phone (Optional)

Plug one end of the modular cord into the EXT.TEL jack on the back of your machine.

Plug the other end of the cord into a modular jack on a telephone answering device or a regular telephone to use as an extension.

3-5 AC Power Cord

Plug one end of the cord into the back of the machine and the other end into a standard, grounded 3-prong AC power outlet.

The machine turns on. All lamps on the control panel light up and the LCD displays ‘SYSTEM INITIAL’ then ‘PAPER OUT’. Load the paper as described on page 3-4.

If you want to turn it off, unplug the power cord. Note : If documents are deleted from memory due

to a power failure, the machine automatically prints out a Power failure report after power is supplied.

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3-4

3-7-1 Print Cartridge

1. When you install a new print cartridges. Press SETUP,MENU & START button. Lift the control panel 1 with your hand and open the cartridge compartment cover 2.

2. If you are replacing used cartridges, remove the old cartridges. Press SETUP,MENU & START button. Pull the print cartridges handle toward you until you hear a click, then remove the print cartridges.

3. Remove the new print cartridges from its packaging. Hold the print cartridges by the black areas or colored top only. Do not touch the copper area.

4. Carefully remove the tape covering the printhead. Be sure to remove all the tape.

5. Insert the print cartridges in the carrier.

3-7 Installing Print Cartridge

Installations

Cartriidge compartment cover

Control panel

Cartridge handle

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4-1

4. Disassembly

4-1 General Precautions on Disassembly

When you disassemble and reassemble components, you must use extreme caution. The close proximity of cables to moving parts makes proper routing a must. If components are removed or replaced, any cables disturbed by the procedure must be replaced as close as possible to their original positions. Before removing any component from the machine, note the cable routing that will be affected.

Whenever servicing the machine, you must perform as follows:

1. Check to verify that documents are not stored in memory.

2. Move the printer cartridge to far right to cap the nozzle.

3. Unplug the power cord.

4. Use a flat and clean surface.

5. Replace only with authorized components.

6. Do not force plastic-material components.

7. Make sure all components are in their proper position.

1. Lift the control panel using hand.

2. Push the bushing on both ends of the roller slightly inward, then rotate it until it reaches the slot as shown below. Then lift the roller out.

Note : Check the roller for any dirt. If dirty, wipe it

off with soft cloth dampened with water. If the roller is heavily worn, replace it with a new one.

4-2 White Roller Ass’y

Bushing

White roller

Control panel

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4-2

Disassembly

4-3 Top Cover Ass’y

1. Lift the control panel and open the print cartridge compartment cover. Remove the white roller ass’y. Remove the six screws shown below.

2. Remove the three screws shown below.

Cartridge compartment cover

Control panel

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4-3

Disassembly

3. Open the outer guide.

4. Take out the top cover ass’y.

5. Remove the two screws securing the speaker.

Outer guide

Top cover ass’y

Outer guide

Top cover ass’y

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4-4

Disassembly

4-4 ASF Frame Ass’y

4-4-1 Rollers (ADF Roller, Drive Roller, Exit

Shaft)

1. Before you disassemble the rollers, you should remove:

– Top Cover Ass’y (see page 4-3)

2. Take out the rollers from the ASF Frame ass’y.

Note : Clean the surface of the rollers with ethyl alco-

hol. After wiping them, you must dry them completely.

4-4-2 CIS (Contact Image Sensor)

1. Before you disassemble the CIS, you should remove:

– Top Cover Ass’y (see page 4-3)

2. Remove the drive roller as described in ‘4-4-1 Rollers’.

3. Remove the one screw securing the CIS ass’y and unplug the CIS harness. Take out the CIS ass’y.

4. Turn the CIS ass’y over. Remove the one screw to release the CIS from the bracket.

Note: Be careful not to lose the springs.

Note : Check the glassy surface of the CIS for any

stain or scratch. If stained, wipe off with ethyl alcohol. If it is heavily stained or scratched, replace it with a new one.

Exit shaft

Drive roller

ADF roller

CIS

Bracket

Spring

CIS harness

Drive roller

CIS ass’y

Drive roller

Exit shaft

ADF roller

CIS harness

Drive roller

CIS ass’y

CIS

Bracket

Spring

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4-5

Disassembly

4-4-3 Scan Motor

1. Before you disassemble the Scan Motor, you should remove: – Top Cover Ass’y (see page 4-3)

2. Unplug the motor connector from the main PBA. Make sure the harness is released from one hooks securing the harness as shown below.

3. Remove the two screws as shown below and take out the scan motor ass’y.

4. Remove the two screws securing the motor to the motor bracket.

Main PBA

Motor harness

Hook

Scan motor ass’y

Motor bracket

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4-6

Disassembly

4-4-4 SMPS

1. Before you disassemble the SMPS, you should remove:

– Top Cover Ass’y (see page 4-3)

2. Unplug the SMPS connector from the Main PBA. Make sure the harness is released from the hook as shown below.

3. Remove the one screw securing the ground wires to the parallel unit as shown.

4. Pushing down the hooks on both ends, pull out the SMPS.

SMPS connector

SMPS ground wire

LIU ground wire

Hook

SMPS

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4-7

Disassembly

4-4-5 LIU PBA

1. Before you disassemble the LIU PBA, you should remove: – Top Cover Ass’y (see page 4-3)

2. Remove the one screw securing the ground wires to the parallel unit.

3. Unplug the LIU connector from the Main PBA.

4. Unplug all the connectors from the LIU PBA.

5. Pulling the snap fits locking the PBA outward, push up the LIU PBA.

SMPS ground wire

LIU ground wire

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4-8

Disassembly

4-4-6 Scan Lawer Frame

1. Before you disassemble the SMPS, you should remove:

– Top Cover Ass’y (see page 4-3) – OPE Unit (see page 4-11)

2. Unplug the all connector(CIS, Scan Motor)from

the Main PBA.

3. Remove the two screws as shown below and take

out the Scan Lawer Frame.

4-4-7 Parallel Unit

1. Before you disassemble the SMPS, you should remove: – Top Cover Ass’y (see page 4-3)

2. Unplug the one connector and remove two screw shown below, and take out the Parallel Unit.

Scan lawer frame

Parallel unit

Parallel harness

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4-9

Disassembly

4-4-8 SMPS Frame

1. Before you disassemble the LIU PBA, you should remove: – Top Cover Ass’y (see page 4-3) – SMPS (see page 4-6) – LIU PBA (see page 4-7) – Parallel Unit (see page 4-8)

2. Remove the two screws as shown below and take out the SMPS Frame.

4-4-9 ASF Cassette Ass’y

1. Pull out the ASF Cassette ass’y.

SMPS frame

ASF cassette ass’y

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4-10

4-5-1 ADF Rubber Pad

1. Open the OPE unit.

2. Insert a flat blade screw driver into the slot as shown below, and release the latches. Take out the rubber holder, sheet ADF and the rubber pad.

Notes:

• When you reassemble the rubber pad, be sure that the rubber pad, sheet ADF and holder fit into the guide boss and the holder latches fit into the corresponding hole. Then push firmly until it clicks.

• Clean the surface of the rubber pad with ethyl alcohol. After wiping it, be sure to dry it. Check the rubber wear. If the wear reaches 1/2 its original thickness, replace it with a new one.

Rubber holder

OPE unit

Rubber pad

Guide boss

Disassembly

4-5 OPE Ass’y

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4-11

Disassembly

4-5-2 OPE Unit

1. Before you disassemble the OPE unit, you should remove:

– Top Cover Ass’y (see page 4-3)

2. Turn the tie stopper 90 degrees as shown below and take out the OPE unit.

4-5-3 Roll Pinch

1. Before you disassemble the OPE unit, you should remove:

– OPE Unit (see page 4-10)

2. Remove the four screw securing the OPE Unit.

3. Turn the upper scan frame of the OPE Unit over.

4. Remove the three screws and take out the spring

pinch. Then take out the roll pinch.

Tie stopper

OPE unit

Spring pinch

Roll pinch

Upper scan frame

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4-12

Disassembly

4-5-4 OPE PBA

1. Before you disassemble the OPE PBA, you should remove: – OPE Unit (see page 4-11)

2. Remove the four screws securing the OPE unit.

3. Remove the nine screw and take out the PBA with LCD.

Notes:

• Do not turn the OPE unit upside down after you

remove the screws securing the PBA. Keys and rubber contacts may be separated and easily lost.

• When you reassemble the OPE unit, make sure the

keys are in correct position.

• When you reassemble the PBA, secure the screws

according in the order of the number printed on the PBA.

• After reassembling, operate the machine to make

sure it works properly.

• After reassembling, make sure the LCD is not

blocked.

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4-13

Disassembly

4-6-1 Mechanism Unit

1. Before you disassemble the Mechanism unit, you should remove: – Top Cover Ass’y (see page 4-3)

3. Remove the three screws securing the printer unit, and unplug the eleven connectors from the Main PBA. Take out the Mechanism unit.

Note: When you reassemble the unit, do not pinch or

short the wire harness.

4-6-2 Main PBA

1. Before you disassemble the Main PBA, you should remove: – Top Cover Ass’y (see page 4-3)

2. Remove the two screw securing the Main PBA.

3. Unplug all connectors from the Main PBA.

4. Pull the sensor lever towards you and take out the Main PBA.

Main PBA

Print Head

SMPS

Parallel Unit

CR Motor

TX Motor

Paper Sensor

LF Motor

Door open Sensor

CIS

Speaker

USB OPE

LIU

4-6 Mechanism Ass’y

Main PBA

Sensor lever

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4-14

Disassembly

4-6-3 Home Ass’y

1. Before you disassemble the home ass’y, you should remove: – Mechanism Unit (see page 4-13)

2. Pushing the both ends of the home ass’y, take out the ass’y in the direction of arrow.

4-6-4 Carriage Ass’y

1. Before you disassemble the carrier ass’y, you should remove:

– Mechanism Unit (see page 4-13)

2. Take out FRC cable from the main PBA, take out 2 CR springs that fix CR shaft, and then separate carriage Assembly.

Home ass’y

CR shaft

FPC cable

Carriage ass’y

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4-15

Disassembly

4-6-5 Base Frame Ass’y

1. Before you disassemble the home ass’y, you should remove: – Mechanism Unit (see page 4-13) – Home Ass’y (see page 4-14) – Carriage Ass’y (see page 4-14)

2. Remove the friction ass’y, then take out the actuator feed.

3. Remove the holder roller.

4. Pull out the base frame ass’y.

Friction ass’y

Actuator feed

Holder roller

Base frame ass’y

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4-6-6 Feed Roller Ass’y

1. Before you disassemble the feeder roller ass’y, you should remove: – Mechanism Unit (see page 4-13) – Base Frame Ass’y (see page 4-15)

2. Remove the bearing feed from the main frame. Pull the feeder roller in the direction of arrow and take it out.

4-6-7 Line Feeder Bracket Ass’y

1. Before you disassemble the line feeder bracket ass’y, you should remove: – Mechanism Unit (see page 4-13) – Feed Roller Ass’y (see page 4-16)

2. Remove the two screws and take out the LF bracket ass’y.

LF bracket ass’y

Feed roller

Bearing feed

4-16

Disassembly

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5-1

5. List Abbreviations

Acrynym Definition

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

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6-1

6. Circuit

6-1 SF-4750C Main PBA

6-1-1 Summary

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

motor driver, PC I/F, and FAX transceiver controls the whole system. The entire structure of the main circuit is as follows:

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

OPE-TXD

MA0~MA14

/WE

/OE MD0~MD7

TMIA1

TMIA0 TMIB0

TMIB1

OK2PRINT /P_EXIT /RING_DET

/HOOK_OFF

CIS_CLK CIS_SH

/SPK_CTL

PREHEAT

CIS-SIG

VREFADC VREFDAC

VOL0 VOL1 VOL2

CML_ON

/DRAM_EN

ICML1

GLED RLED BLED

OPE-RXD

MCLK(38MHz) /POR

/ROMCS

/RD, /WR

D0~D15

D0~D7

A0~A17

A0~A9

A0~A4

/MODEM-RST

/USB-RST

/USB-CS

/USB-XDDCK

/USB-XDREQ

/USB-INT

/MCS

/MIRQ

/RD, /WR

/RASO

/WR

/UCAS,

/LCAS

/F-POR

MORK(38MHz)

/XDACK /XDREQ

/IP-CS

/RD, /WR

D0~D15

A0~A5

/TX-INT

LFPHA

MFP

CONTROLLER

(KS32C6400)

LFPHB

LFIA0 LFIA1 LFIB0 LFIB1

DIR

PWM

CHX CHY

/HEAD-EN

/HGA1~/HGA13

HOE1~HOE16

/FAULT-TEST

BIASOFF

/RST-OUT

FLASH

MEMORY

(4M bit)

DRAM

(16M bit)

MODEM

SCAN

IMAGE

PROCESSOR

LF MOTOR

DRIVER

SRAM

CIS

CR MOTOR

DRIVER

EN CORDER

PRINT HEAD

DRIVER &

CONTROL/

CIRCUIT

OPE

TX MOTOR

DRIVER

/OPE-RST

C_HEAD DATA

Backup

Power

USB

Controller

VBUS USBDP USBDM

PULLUP

48MHz CLK

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6-2

6-1-2 MFP Controller (KS32C6400 : U26

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

6-1-2-1. SYSTEM CLOCK

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

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

• /RD & /WR /RD & /WR signals are synchronized with MCLK(38MHz) and become LOW ACTIVE. These signals are strobe signals used to read and write data when each CHIP SELECT is connected

with /RD and /WR pin of RAM, ROM, USB, MODEM and the outside devices and becomes active.

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

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

ACTIVE)

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

SELECT (LOW ACTIVE)

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

ACTIVE)

- /MCS : MODEM(U37) CHIP SELECT (LOW

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

• D0 - D15

- 16bit data bus

• A0 - A17

- ADDRESS BUS (A18 - A21 are reserved.)

Circuit

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