Samsung SF 5100, 5100P Service Manual

1. Precautions

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

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-ofplace, 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 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.

Samsung Electronics 1-1

1-2 Samsung Electronics

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.

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.

1-3 Lithium Battery Precautions

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.

2. Specification

2-1 Facsimile

Machine type : Desk Top Applicable line : Public Switched Telephone Network (PSTN) or behind PABX Compatibility : ITU-T Group 3, ECM Data coding : MH/MR/MMR (ECM Mode) Modem speed : 14400/12000/9600/7200/4800/2400 bps Transmission speed : Approx. 6 sec. (V.M ECM:14.4 kbps) Effective scanning width : 8.3 inches (210 mm) Effective printing width : Letter : 8.2 inches A4 : 202 mm Scanning method : Sheet-fed scanning using a Contact Image Sensor (CIS) Memory : MFP About 2 MBytes

FAX 1 MByte Halftone : 64 levels Printing speed : 6 PPM (Letter size) Automatic document feeder : 20 pages (20 lb or 75g/m2) Documents size : Width : 148 to 216 mm

Length : 128 to 356mm (Single Page)

128 to 297mm (Multi Pages)

Weight : 50 to 100 g/m2 (Single Page)

50 to 90 g/m2(20 Pages)

75 g/m2(30 Pages) One-touch dial : 10 locations LCD : 16 characters x 1 lines

2-2 SCANNER

Scanning Method : Sheet-fed scanning by CIS and feeding of the document by a

stepping motor

Resolution

Horizontal 8 dots/mm (200 dpi) (CIS Spec.) Vertical STANDARD : 3.85 lines/mm (98 Lpi)

FINE : 7.7 lines/mm (196 Lpi)

SUPER FINE : 11.8 lines /mm (300 Lpi) Photo Scale : 256 shades Scanning period : STANDARD : 5 ms/line

FINE : 5 ms/line

SUPER FINE : 5 ms/line

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2-2 Samsung Electronics

2-3 Printer

Print Speed 6 PPM (Letter Size, 5% Charcter Pattern) At Copy Mode Resolution 300 X 300 DPI Source of Light Laser Diode(LSU) Print Method Non-impact Electrophotography, Laser Beam Feed Method Multi-Purpose Feeder and Manual Feed Reference Center Reference Loading Paper Size Bin Type

Normal Paper : A4,Letter,Legal,B5, Executive, A5 Envelope : Normal Envelope Length : 149 ~ 365mm Width : 100 ~ 216mm

Weight : For MPF, 60 ~ 90g/m

For Manual, 60 ~163g/m

Paper Capacity MPF : 150 Sheets (based on 75g/m2)

Manual Slot : 1 Sheet (Only SF-5100P) Paper Stacker Capacity Face up : 100 Sheets (75g/m2,20 lb) Warming up Time First Printing Time Stand-By : 20 Sec

Power Save Mode : 30 Sec Power Rating AC 110V ~120V ±15% 50/60Hz ± 3Hz,

AC 220V ~ 240V ± 15% 50/60Hz ± 3Hz Power Consumption Avg. 180Wh Power Saving Consumption Avg. 10Wh Sleep Mode

Certification & Compliance FCC, UL, CSA, CE, CB

Acoustic Noise Standby : Less than 36dB

Sleep Mode : Less than 29dB

Operating : Less than 50dB

Specification

Samsung Electronics 2-3

Specification

Toner Cartridge One-Cartridge type

Expected Life Span 50,000 Sheets

Operating Environment Temperature : 10 ~ 32°C

Humidity : 20 ~ 85%

Storage Environment Temperature : -20 ~ 40°C

Humidity : 10 ~ 95%RH

Weight Net : Max. 7kg(with Accessory)

Gross : Max. 14kg

External Dimension 313(W) X 325(D) x 228(H)mm (without Handset)

376(W) X 361(D) x 336(H)mm (with Handset)

Developer . Life Span : 5% Pattern,Min. 2,500/1,000 Sheets

. Developing : Non-magnetic

Contact Developing . Charging : Conductive Roller Charging . Density Adjustment : Normal/Economic Mode selectable by the

PC driver (Only SF-5100P)

. Toner Supply Method : Exchanging

Toner Cartridge . New Developer Checkable . Transfer System : Conductive Roller Transfer . Fusing System : Temperature & Pressure . OZONE Emission : Max. 0.1 PPM(8 Hours)

2-4 Samsung Electronics

Specification

2-4 Quality

Conditions

Paper Normal Paper 75g/m

Environment Temperature : 20 ~ 25°C

Humidity : 40 ~ 60%

Print Quality

Image Density Min. 1.3

Min. 1.0(Temperature : 10 ~ 15°C) Background Max. 0.2 Uniformity Max. 0.2(Including Continuous Print) Fusing Min. 75% (All Black) Start Position Top : x ± 4.23mm, Side : y ± 4mm From Left Skew Top : Max. ± 1.5mm/200mm

Side : Max. ± 2.0mm/250mm Orthogonality ±1.0mm Horizontal Scan ± 0.6mm/208mm

(Bowed Line Skew : Pattern 1) Special Paper Exception Image Density : Min 1.0 (Envelope)

Fusing : Min. 70% (All Black)

(Envelope/OHP/Postcard) Paper Jam Less than 1/1,000(75g/m2Paper)

Paper Curl First : Less than 16mm (10 Sheets, 75g/m2Paper)

After Cooling : Less than 16mm (10 Sheets, 75g/m2Paper)

Reliability

Insulation Resistance Less than 10 MΩ (at DC 500V) Dielectric Strength AC 1000V (DC 1420V), 10mA Ground Continuity Less than 0.1Ω Voltage DIP Rated Voltage ± 15% AC Impulse Noise AC 1000V 10, 100, 200, 400, 1000ns Rated Power Leakage Current Less than 3.5mA Surge 6 KV, 500A/3 KV, 500A OZONE Emission Less than 0.1 ppm (8 Hours) Top Cover Open Isolating the input power of the LSU,

High Voltage Part, and Fuser Overcurrent Protect Fuse inside the SMPS

Fusing System

Trouble Sensing .The temperature doesn’t rise to the specific

temperature in the specific time.

.The temperature is too high. Overheat Sensing 240 ~ 250°C (The thermostat cuts off the Fuser

from the power.)

Thermistor Open Sensing : Without the initial

temperature change of the Fuser

Indicate the Fuser error

2-5 SMPS (Switching Mode Power Supply)

Input (AC)

AC Input Voltage European American

Minimum 198V 90V Typical 230V 120V

Maximum 264V 135V Max. AC Input Current 2.5Amps 3Amps Max. Inrush Current Ap-p (at 20°C)

Output (DC)

Line Regulation 24V ± 10%

5V ± 5%

Road Regulation 24V ± 10%

5V ± 5%,-5V ± 5%

Ripple Noise 24V : Peak 300mV

-5V : Peak 500mV 5V : Peak 500mV

Over Current Protect 24V : 2.7A ± 10% (by Circuit)

5V : A ± 10% (by Circuit)

Over Voltage Protect 24V : 33VDC

5V : 5.6VDC

Samsung Electronics 2-5

Specification

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Specification

Memo

Samsung Electronics 3-1

3. Tech Mode

3-1 To Access TECH Mode

In Tech mode, the technician can perform various tests to isolate the causes of a malfunction, and set the technical option features to customize the machine depending on the user ’s operation environment.

To access TECH mode, press SETUP, #, 1, 9, 3, 4 in sequence, and the LCD displays ‘TECH’ in the standby mode screen. While in TECH mode, the machine still performs all normal operations. To return to the normal user mode, press SETUP, #, 1, 9, 3, 4 in sequence in TECH mode or turn the power off, then back on.

The technical options you have set in TECH mode are not changed unless you clear the machine’s memory in TECH mode.

To communicate via direct connection with another fax machine, press OHD/V.REQ followed by Start/Enter.

In TECH mode, press SETUP, then press or until ‘TECH MODE’ appears in the display. Press Start/Enter. The following technical options are available.

Note: If necessary, print System Data List in TECH mode. The list shows all current system data settings including the TECH MODE options. To print the system data list, press Report/Help, then press √ or ® until ‘SYSTEM DATA’ appears in the display, and press Start/Enter.

Modem Speed

Default = 14.4 kbps

Select the maximum modem speed of 14400, 12000, 9600, 7200, 4800, or 2400 bps. When the modem speed is set to 14400 or 12000, the Rx speed can be either V.33 or V.17 speed. When it is set to 9600 or 7200, the Rx speed can be either V.29 or V.27ter speed. When set to 4800 or 2400, the Rx speed can any V.27ter speed.

Dialing Mode

Default = Tone

Select the dialing mode according to the user’s line status.

Send Fax Level

Default = -12 dBm

You can set the level of the transmission signal. Typically, the Tx level should be under -12 dBm. The level within the range of 1 to -15 dBm is acceptable. Enter the desired value using the number keypad.

RCV Fax Level

Default = -43 dBm

The reception level may be too low due to the cable losses. If it is set to -43 dBm, the reception sensitivity will be between 0 and -43 dBm. If it is set to -48 dBm, the reception sensitivity will be between 0 and -48 dBm.

3-2 Tech Mode Options

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Tech Mode

Flash Time

Default = 600 milliseconds

Set the flash time to 80, 280, or 600 milliseconds.

Pause Time

Default = 3 seconds

It sets the length of the pause time from 1 through 9 seconds, when the pause button is pressed.

Redial Interval

Default = 3 minutes

If the remote machine is busy when the machine sends a fax using automatic dialing, the machine automatically redials the number. Select the time interval between automatic redial attempts. Enter the desired redial interval using the number keypad: 1 - 15 minutes.

Redial Count

Default = 2

Select the number of automatic redial attempts. Enter the desired number using the number keypad: 0 - 5.

DP Make/Break

Default = 40 - 60

Select the dial pulse make and break time: 40-60 or 33-67.

Silence Time

Default = Unlimited

In ANS/FAX mode, after a call is picked up by the answering machine, the machine monitors the line. If a period of silence is detected on the line at any time, the call will be treated as a fax message and the machine begins receiving. Silence detection time is selectable between limited (about 12 seconds) and unlimited time.

When ‘12 sec’ is selected, the machine switches to receiving mode as soon as it detects a period of silence. When ‘Unlimited’ is selected, the machine waits until the answering operation is concluded even though a period of silence is detected. After the answering operation is concluded, the machine switches to receiving mode.

Error Rate

When the error rate is about to be over the setting value, the Baud rate automatically lowers up to 2400 bps to make the error rate remain below the setting value.

You can select the rate between 5% and 10%.

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Tech Mode

In TECH mode, press SETUP, then press or until ‘MAINTENANCE’ appears in the display. Press Start/Enter. The following technical options are available:

Clean Drum Use this feature to get rid of the toner remained in

the development unit, so you can get a clean printout.

Adjust Shading Use this feature to correct the white reference of the

scanner if you experience bad copy images. When using this feature, a white paper should be used to get clean copy images.

Remote Test The Remote Test feature can be enabled in order to

allow a remote location to call up and run a diagnostic test on your machine. You may be instructed by a service representative to enable this feature.

Notify Toner Low With this feature enabled, when the toner becomes

low, the toner low information will be sent to ta specified contact point, for example, the service company. After you access this menu, select ON, and when the LCD prompts, enter the name and the number of the contact point, the customer ’s fax number, the model name, and the serial number.

ROM Test Use this feature to test the machine’s ROM. The

result and the software version appear in the LCD display.

CIS T

est

This test checks the operation of the Contact Image Sensor (CIS). Each time the number changes by one increment, the average ADC value of CIS prints out.

DRAM Test Use this feature to test the machine’s DRAM. The

result appears in the LCD display.

Switch Test Use this feature to test all keys on the operation

control panel. The result is displayed on the LCD window each time you press a key.

Modem Test Use this feature to test the machine’s modem. The

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

-FSK test

-Tones: 1100 Hz, 1650 Hz, 1850 Hz, 2100 Hz

-G3 training: 14400, 12000, 9600, 7200, 4800, 2400 bps

DTMF Test Use this feature to test the machine’s DTMF (Dual

Tone Multi Frequency) signal. When you press any key on the number keypad including ✻ and #, you will hear the corresponding key tone.

Toner count This feature shows the current state of the toner

cartridge. After replacing Main board to new one, you should update the information to the new board. See page 00.

- TONER CNT: The total number of the dots used to print up to current time.

- CRU STATE: The page number which the toner cartridge can print.

Printing Info This feature allows the machine to automatically

print various information, like toner count, transfer voltage, fusing temperature and so on, at the bottom of each printed page.

- PAGE TONER CNT: prints the number of dots used to print the page.

- TOTAL TONER CNT: prints the total number of the dots used to print up to current time.

- THV ON DUTY: prints ADC value of transfer voltage.

- THERMISTER: prints ADC value of fusing temperature.

- P: prints the page number.

Program Download Use this feature to download a new upgraded ROM

file from a PC that is connected to the machine with a parallel cable (IEEE 1284).

3-3 Maintenance Options

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Tech Mode

In TECH mode, press Report/Help, then select the desired list or report by using or key, then press Start/Enter. The following options are available:

Help

It shows a brief description on the machine’s basic functions and commands. Use it as a quick reference guide.

Sent Journal

This journal shows a specific information concerning transmission activities, the time and dates of up to 40 of the most recent transmissions.

Received Journal

This journal shows a specific information concerning reception activities, the time and dates of up to 40 of the most recent receptions.

Phonebook

It lists all telephone numbers that have been stored in the machine.

Sending Confirm

It shows the result of the last send operation.

Schedule Inform

This list shows a specific information on the documents currently stored for delayed transmission. It provides the operation number, starting time, type of operation, etc.

System Data

This list provides a list of the user system data settings and tech mode settings.

Protocol List

This list shows the sequence of the CCITT group 3 T.30 protocol during the most recent sending or receiving operation. Use this list to check for send and receive errors. If a communication error occurs while the machine is in TECH mode, the protocol list will print automatically.

Pattern Print

Using this pattern printout, you can check if the printer mechanism is functioning properly. Examine the pattern and look for a break in the diagonal line. If the diagonal lines are not broken, the printer mechanism is functioning properly.

Shading Print

With this print, you can check the scanning elements of the CIS (Contact Image Sensor).

3-4 Printout Report

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Tech Mode

The Engine test mode is used to check the operation of the components related to the printer engine. The following test are available.

• MHV ON/OFF

• DEV ON/OFF

• THEVEA(THV-) ON/OFF: tests THV- voltage on/off.

• THV+ REF ON/OFF: tests THV+ voltage on/off.

• THV TRIGGER: tests THV+ trigger.

• MAIN MOTOR ON/OFF

• SOLENOID ON/OFF

• LSU MOTOR CHECK: tests the operation of LSU motor

• HSYNC CHECK: tests the operation of laser diode module of LSU.

• SENSOR CHECK: tests various sensors and switches. ([FD]: Feed sensor, [ET]: Exit sensor, [PE]: Paper empty, [CO]: Cover switch)

• PWM CODE: tests variability of THV- voltage. ([000]: outputs about 5 KVdc, [255]: outputs about 0 Vdc)

• FUSER TEST: tests the temperature of the fuser. When printing, the fuser operates in the temperature set for printing. When the power is turned off and back on, the fuser restores the temperature to default. ([161]: about 150 °C, [143]: about 170 °C)

• TOP MARGIN SET

• BIAS TEST VALUE: tests variability of bias voltage. When printing, the machine operates in the bias voltage set for printing. When the power is turned off and back on, the machine restores the bias voltage to default. ([172]: outputs about 350 Vdc, [196]: outputs about 450 Vdc)

• THV TEST VALUE: When printing, the machine operates in THV+ voltage set for printing. When the power is turned off and back on, the machine restores THV+ voltage to default. ([000]: outputs about 5 KVdc, [255]: outputs about 0 Vdc)

To access the Engine test mode:

1. Press Setup, #, 1, 9, 3, 1 in sequence.

2. When ‘ENGINE TEST?’ appears, press

Start/Enter.

3. Scroll the options by pressing or repeatedly find the one you want.

4. Press Start/Enter to start the test.

5. Press Stop to exit the Engine test mode.

3-5 Engine Test Mode

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Tech Mode

Memo

4. Disassembly and Reassembly

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, any cables disturbed by the procedure must be restored 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. Be sure to remove the toner cartridge before you disassemble parts.

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.

Releasing Plastic Latches

Samsung Electronics 4-1

Many of the parts are held in place with plastic latches. The latches break easily; release them carefully. To remove such parts, press the hook end of the latch away from the part to which it is latched.

4-2 Samsung Electronics

Disassembly and Reassembly

4-2 Cradle

1. Push the lever (①) and remove the cradle as shown below.

4-3 White Roller

1. Open the OPE cover.

2. Push the bushing on the both ends of the roller slightly inward, then rotate it until it reaches the slot. 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.

4-3

Samsung Electronics

Disassembly and Reassembly

4-4 OPE Cover

1. Pull the cover release button on both sides of the machine, and open the front cover.

2. Remove two stoppers holding the front cover unit

3. Pull the bottom left end of the cover downward to unlatch the front cover unit and remove the cover from the main frame.

4. Remove two screws securing bracket scan board, then take out the bracket scan board.

5. Unplug two connectors and one wirefrom the

scan board

4-4 Samsung Electronics

Disassembly and Reassembly

6. Lift the OPE cover.

7. Remove the stopper holding the OPE cover.

8. Unlatch the bottom ends, then remove the OPE cover.

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Disassembly and Reassembly

4-5 ADF Rubber

1. Before you remove the ADF rubber, you should remove:

– OPE cover (see page 4-3)

2. Remove two screws and remove scanner upper

frame.

3. Push down and release the latches and remove the ADF rubber.

4-6 OPE Board

1. Before you remove the OPE board, you should remove:

– OPE cover (see page 4-3)

2. Remove four screws securing the OPE board.

3. Release two latches securing the both side of the LCD and the two of four latches securing the board. Then remove the OPE board.

4-6 Samsung Electronics

Disassembly and Reassembly

4-8 Lever sensor Scan

1. Push the both sides of Lever sensor Scan inward, then unlatch and take out the sensor Scan from the scan upper frame.

4-7 Lever sensor Doc

1. Unlatch the lever sensor Doc from the scan upper frame and take it out.

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Disassembly and Reassembly

4-9 Scan board

1. Before you remove Scan board, you should

remove:

– Bracket scam board (see page 4-3)

2. Unplug all the connectors from the scan board

and remove the board.

4-10 Scan Motor

1. Before you disassemble Scan motor, you should

remove:

– OPE cover (see page 4-3) – Bracket scan board (see page 4-3)

2. Unplug one connector from the scan board.

3. Remove three screws, then remove the motor ass’y

from the main frame.

4. Take out the gear from the motor ass’y.

5. Remove two screws and remove the motor.

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Disassembly and Reassembly

4-12 CIS

1. Push CIS as shown below and lift it to remove from the scan front frame.

2. Separate the guide CIS from CIS.

3. Remove ADF roller from the scan front frame.

4-11 ADF roller

1. Before you remove the ADF roller, you should remove:

– OPE cover (see page 4-3)

2. Remove two screws securing the guide paper and remove the guide paper.

Guide Paper

ADF Roller

CIS

Guide CIS

4-9Samsung Electronics

Disassembly and Reassembly

4-13 Rear cover

1. Remove two screws.

2. Push the metal clip on the parallel port down and

remove the rear cover from the main frame.

4-14 Top cover

1. Before you remove the ADF roller, you should remove:

– OPE cover (see page 4-3) – Rear cover (see above)

2. Remove two screws securing the top cover from

the back side of the machine.

3. Remove two screws and slide the left and right paper guides fully inward. Then spread the bottom of the top cover and lift the cover to remove.

Paper guides

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Disassembly and Reassembly

4-15 Tray

1. Before you remove the tray, you should remove:

– OPE cover (see page 4-3) – Rear cover (see page 4-9) – Top cover (see page 4-9)

2. Take out the tray from the main frame.

4-16 LSU

1. Before you remove the LSU, you should remove:

– All covers (see page 4-3, 4-9)

2. Remove three screws securing the LSU.

3. Unplug two connectors from the LSU and

remove the LSU.

4-11Samsung Electronics

Disassembly and Reassembly

4-17 Transfer roller

1. Pull the cover release button on both sides of the machine, and open the front cover.

2. Lift the transfer roller using a proper tool and

take out the roller.

4-18 Engine board

1. Before you remove the Engine board, you should remove:

– All covers (see page 4-3, 4-9) – LSU (see page 4-10)

2. Unplug five connectors and remove one screw from the

engine board, then remove the board.

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Disassembly and Reassembly

4-19 Pick-up roller ass’y

1. Before you remove the pick-up roller ass’y, you should remove:

– All covers (see page 4-3, 4-9) – LSU (see page 4-10)

2. Unplug all the connectors from the engine board.

3. Remove four screws securing the plate upper and remove the plate upper as below.

4. Remove two screws and remove the roller from the plate.

Note: When you reassemble the pick-up roller,

make sure that the right end of the pick-up roller fits into the pick-up gear shaft.

Pick-up gear shaft

Samsung Electronics 4-13

Disassembly and Reassembly

4-20 Knock-up ass’y

1. Before you remove the knock-up ass’y, you should remove:

– All covers (see page 4-3, 4-9) – LSU (see page 4-10) – Plate upper (see page 4-12)

2. Pull the knock-up ass’y fully backward.

4-21 Cap-pad

1. Before you remove the cap-pad, you should remove:

– All covers (see page 4-3, 4-5) – LSU (see page 4-10) – Plate upper (see page 4-12) – Knock-up ass’y (see above)

2. Take out the cap-pad from the main frame.

3. Remove the knock-up ass’y from the main frame.

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Disassembly and Reassembly

4-22 Holder-pad

1. Before you remove the holder-pad, you should remove:

– All covers (see page 4-3, 4-9) – LSU (see page 4-10) – Plate upper (see page 4-12) – Knock-up ass’y (see page 4-13)

– Cap-Pad (see page 4-13)

2. Remove the holder-pad from the main frame.

4-23 Motor ass’y

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

– All covers (see page 4-3, 4-9)

2. Remove five screws securing the motor ass’y and unplug one connector from the engine board, then remove the motor ass’y.

Note: When you reassemble the motor ass’y, make

sure that the bosses shown in the figure below fit into the corresponding screw holes on the motor ass’y to allow the screws to be fastened properly.

Boss

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