Samsung SF4500 Troubleshooting

Samsung Electronics 8-1

8. Troubleshooting

8-1 SCANNER

PROBLEM ITEMS TO BE CHECKED HOW TO SOLVE

White Copy

Black Copy

Defective image
quality

• Check shading profile.

• Check white Ref. value and black
Ref. value.

• Check CIS signal input level.

• Check shading profile.

• Check if CIS LED is on/off.

• Check white ref.value and black
Ref.value.

• Check CIS signal input level.

• Check shading profile.

• Check printing quality.

• Remake shading profile in the tech mode.

• Replace U17 if it is defective.
(white Ref. =3.0V. black Ref=1.4V)

• Check if it is 3.0V when operating and

1.5V when idle. If defective, replace CIS.

• Remake shading profile in the tech mode.

• Check if CIS harness is pluged.

• If defective, replace U17.
(white Ref.=3.0V. black Ref=1.4V)

• Check if it is 3.0V when operating and

1.5V when idle. If defective, replace CIS.

• Remake shading profile.

• Refer to printing quality.

8-1-1. COPY

PROBLEM ITEMS TO BE CHECKED HOW TO SOLVE

Scanning error

Defective image
quality

• Check if printer cable is installed.

• Check if printer cable is appropriate.

• Check how TWAIN driver is installed.

• Check parallel port I/P part.

➀

Check the early state of J2 print
signals.: #1, 10-14, 31, 32, 36

➁

Check U4 input/output signals.

➂

Check input/output signals of
U16-43 ~ 51, U16 - 53 ~ 61.

Refer to ‘1.COPY’.

• Check if printer cable is correctly installed.

• Check if printer cable is proper for
IEEE1284.

• Reboot the system after TWAIN driver is
installed again.

• Replace the main PBA.

Refer to ‘1.COPY’.

8-1-2. PC-SCAN

Samsung Electronics 8-2

8-1-4 Setting-up System

8-1-4-1 Options

8-1-3 Service Mode

8-1-3-1 HOW TO ENTER SERVICE MODE

In service (tech) mode, the technician can check the
machine and perform various test to isolate the cause
of a malfunction.

To enter the service (tech) mode, press MENU, #, 1,
9, 3, 4 in sequence, and the LCD briefly displays
‘TECH’, the machine has entered service (tech) mode.
While in service (tech) 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 plugging the power cord.

Options changed while in service mode do not
remain changed unless you clear the machine’s
memeory.

Options in User Mode Item Default Status

RINGER VOLUME [LOW/MEDIUM/HIGH] HIGH
HOME SETTING

E RESOLUTION [STANDARD/FINE/SUPER FINE] FINE
E CONTRAST [NORMAL/DARKEN/LIGHTEM/PHOTO] MORMAL

Options in Tech Mode Item Default Status

MODEM TEST FSK/2400/4800/7200/

9600/12000/14400 bps
DTMF TEST 1100/1650/1850/2100Hz
ADJUST SCAN LED ON TIME
RINGER VOLUME [LOW/MEDIUM/HIGH] HIGH
HOME SETTING

E RESOLUTION [STANDARD/FINE/SUPER FINE] FINE
E CONTRAST [NORMAL/DARKEN/LIGHTEN/PHOTO] NORMAL

PROGRAM DOWNLOAD

Samsung Electronics 8-3

8-1-4-2 OPTIONS IN SYSTEM SETUP

MODEM TEST

The modem will send various transmit signals on the
telephone line you can check the fallowing:

• FSK tect

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

• G3 training : 14400, 12000, 9600, 7200, 4800, 2400bpi

DTMF

DTMF (Dual Tone Multiple Frequency) signal can be
checked.

• 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, *, #

ADJUST SCAN LED ON TIME

• It is used to adjust the anount of light of CIS. It is
already set at CIS LED ON TIME to get optimum
quality.

ADJUST SEQUENCES

1. Load All White Document in scanner Unit

2. Enter ‘Tech Mode’

3. Press MENU→ 04(SYSTEM SETUP)

→ ✔ → ✔

4. LCD will display ‘ADJUST SCAN LED ON TIME?’

5. Press ‘START’ then LCD will display ‘SHADING..’

6. After scanning, Shading waveform will be printed

out.

7. Press ‘STOP’

8. Turn OFF system and Turn ON

WARNNING!
Shading profile MUST be made after
Downloading a new Firmware. If not, system
will not work properly.

Fig.8-1-4-2-1 Mono Shading Waveform

Fig.8-1-4-2-2 Color Shading Waveform

Samsung Electronics 8-4

RINGER VOLUME

•Refer to User ’s Guide.

HOME SETTING

•Refer to User ’s Guide.

PROGRAM DOWNLOAD

• It is used to download ROM files into the machine

using its flash ROM. If you download CIS or the
main board again, you should adjust SCAN LED
ON TIME.

• Download Sequences:

➀

Press the ‘START’ key in ‘PROGRAM DOWN­LOAD?’ then the display shows ‘ARE YOU
SURE? 1. YES 2. NO’

➁

Press the ‘I’ key

➂

Download ROM files from a PC that can be con­nected with Pallel cable (IEEE 1284).

8-1-5 Changing System data

8-1-5-1 Selectable System data

System data in User Mode Item Default Status

FAX PAPER SIZE [LETTER/A4/LEGAL] A4
MESSAGE CONFIRMATION REPORT [ON/OFF/ERROR] ON-ERROR
AUTO TX/RX REPORT [ON/OFF] OFF
REMOTE RCV MF CODE [0-9] *9*
DIAL MODE [TONE/PLUSE] TONE
ECM MODE [ON/OFF] ON
DIRECT COPY [ON/OFF] OFF
AUTO REDUCTION [ON/OFF] ON

E VERTICAL REDUCTION ONLY [ON/OFF] OFF
DISCARD SIZE [0-30] 8mm
RETRY INTERVAL [1-7] 3minutes
RETRY COUNT [0-2] 2
AUTO RECEIVE ON RING COUNT [1-7] 2
FORCED MEMORY TX [ON/OFF] OFF
RECEIVE TERMINAL ID. [ON/OFF] OFF
CONTINUOUS POLL REPORT [ON/OFF] OFF
FAX PRINT QUALITY [LQ/DRAFT] LQ

System data in Tech Mode Item Default Status

MODEM SPEED [2400/4800/7200/9600/12000/14400] 14.4 KBPS
FAX TX LEVEL [1-15] –12dBm
FAX RX LEVEL [40-50] –43dBm
FLASH TIME [100/280/600] 100ms
PAUSE TIME [1-9] 4sec

Samsung Electronics 8-5

8-1-5-2 SYSTEM DATA

MODEM SPEED

Default = 14400 bps

Select baud rate of 14400, 12000, 9600, 7200, 4800, or
2400 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 14400 or 12000 bps, the RX speed will be
either V.17 or V.33. When the TX speed is set to 9600
or 7200 bps, the RX speed will be either V.29 or V.27
ter. When the TX speed is set to 4800 or 2400 bps, the
RX speed will be V.27 ter.

FAX TX LEVEL

Default = –12 dBm

FCC requires that the transmission level be less than
–9 dBm. From –9 dBm to –15 dBm is acceptable. You
can set the transmission level between 0 and –15
dBm in 1dBm steps using the control panel keypad.
Accuracy is +0/–3 dBm.

FAX RX LEVEL

Default = –43 dBm

Reception level may be too low due to cable losses. If
set to –43 dBm, reception sensitivity will be betWeen
0 and –43 dBm.

FLASH TIME

Default = 100 mseconds

Choose flash time 100/280/600 milliseconds.

PAUSE TIME

Default = 4.0 seconds

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

8-1-5-3 CHANGING SYSTEM DATA

Press MENU and one-touch button 01 system data.
Then press 1 to choose ‘Tech’. Press ▲ or

▼

repeatedly to select the desired system data.
When the desired system data appears, enter the cor­responding information to change the status of the
selected function. Press STOP to return to the date
and time display.

Samsung Electronics 8-6

8-2 FAX/TELEPHONE Precautions

PROBLEM ITEMS TO BE CHECKED HOW TO SOLVE

TEL LINE CANNOT
BE ENGAGED (NO
DIAL TONE)

Cannot MF dial.

MF dial is possible
but not DP dial.

Defective fax
transmission

Defective automatic
fax reception

• When you pick up the handset:

➀

Check line cord connection and
P3(LIU) connection.

➁

Check hook switch of H/B Cradle
and D2(LIU) connection.

➂

Check the circuit around R2, Q1
and Q2 of LIU PBA.

➃

Can’t you hear dial tone though the
line is engaged?

• When you press “OHD” key:

➀

Check line cord connection.

➁

Check U7(main PBA), main LIU
harness, and P1(LIU PBA).

➂

Check relaying operation of LIU
PBA : Is the control signal of

U18-49(main) high?

• Check U7(main PBA), main-LIU
harness, and P1(LIU PBA)

• Check signals of U16-122, 123.

• Check DP control signal of U3-27 of
LIU PBA and the circuit around R2, Q1
and Q2.

• Check connection of R43 of LIU PBA.

• Check U7(main PBA), main LIU
harness, and P1(LIU PBA).

• aIs the external phone hooked off?

b

Is the output of U2-4(LIU PBA) low?

• Check ‘hook off’. : Refer to ‘TEL LINE
CANNOT BE ENGAGED’.

• Check the control signals of U15-122,

123.

• Check transmission path.: Check
output of U15-44(main PBA) and input
of U3-3(LIU PBA).

• Check reception path.: Check output of
U3-40(LIU PBA) and input of
U15-45(main PBA).

• Is the ring checked?
Check ring pattern at U18-84(main
PBA).

• Refer to ‘Defective Transmission’.

• ➀Insert it correctly into the connection jack
called “line”.

➁

Replace defective parts.

➂

Replace LIU PBA.

➃

Replace the handset.

• ➀Insert it correctly into the connection jack
called “line”.

➁

Replace defective parts.

➂

Replace main PBA IF the control signal of
U18-49(main) is low. Replace LIU PBAif

high but phone line cannot be connected.

• Replace defective parts.

• Replace main PBA if the signals of U16-

122(LIU_TXD) are abnormal. Replace LIU
PBA if the signals of U16-123(LIU_RXD).

• Replace LIU PBA.

• Replace LIU PBA.

• Replace defective parts.

• aHook on the external phone correctly.

b

Replace LIU PBA if low.

• Refer to ‘TEL LINE CANNOT BE

ENGAGED’.

• Replace main PBA if the signals of

U15-122 (LIU_TXD) are abnormal.
Replace LIU PBA if the signals of
U15-123 (LIU_RXD) are abnormal.

• Replace main PBA, if abnormal.

• Replace LIU PBA if the output of

U3-40 (LIU PBA) is not confirmed.
Check the circuit around U6 (main PBA)
if the input of U21-45 (main PBA) is not
confirmed though the output of
U3-40 (LIU PBA) is confirmed.

• Replace LIU PBA if it cannot be checked.

• Refer to ‘Defective Transmission’.

Samsung Electronics 8-7

8-3 Paper Feed

PROBLEM ITEMS TO BE CHECKED HOW TO SOLVE

ASF feeds paper
but paper is not
supplied to the
engine.

ASF cannot feed
paper.

Can’t feed
envelopes

Tilted Printing

• Check if actuator feed operates
perfectly.

• Check if paper sensor is normal.

• Check if stopper clutch operates
perfectly.

• Check if too much paper has been
supplied.

• Check if pickup roller rubber of the
ASF is worn out.

• Check the location of the envelope
guide of ASF.

• Check if paper guide of the ASF is
adjusted to the size of paper.

• Replace actuator-feed, spring, or other
defective parts.

• Replace the paper sensor.

• Replace stopper clutch assembly.

• Supply appropriate amount of paper(130
sheets of normal copying paper).

• Replace pickup roller rubber.

• Open the envelope guide when you feed
envelopes.

• Adjust paper guide to the size of paper.

* ASF: Automatic Sheet Feeder

Samsung Electronics 8-8

8-4. Printing Quality

8-4-1 White lines on letters or graphics.

■

Cause
If nozzles in print head has a problem, white lines
are marked on the print.

‘Self-Test printing’ will let you know if nozzles have
fallen problems.

■

Solution

1) Run ‘print control panel’ to “clean cartridge” and
check if nozzles have been blocked.

2) Wipe with soft cloth the contact surfaces of ink car­tridge and carriage, and check if nozzles have been
cleaned properly.

3) Separate ink cartridge from carriage and combine
them. Repeat it about 5 to 6 times and check if con­nection is proper.

4) Replace ink cartridge and check whether there’s a
problem with thehead.

5) Check if head cable is inserted well into the main
circuit board and then check if nozzles have prob­lems.

6) Check if head cable is broken or torn and then
check if nozzles have problems.

7) Replace the main circuit board with a new one and
check if nozzles have problems.

If this line is broken, it confirms that
nozzles have problems.

Samsung Electronics 8-9

8-4-2 When Vertical lines are printed
crookedly

■

Cause : Vertical lines are printed crookedly if you

do not “align Vertical lines” on the printer.

■

Solution

1) Run print control panel to “align Vertical lines”,
and

2) Select the best one of the above samples and enter
the number.

3) This function to align Vertical lines is available
both for mono and color cartridges.

8-4-3 When ink spreads on transparent

film

■

Cause : You selected a wrong medium on the

driver or you did not use transparent film
designated for inkjet.

■

Solution

1) Use only transparent film designated for inkjet
when you print on transparent film by an inkjet
printer.

2) Run “Windows driver” and select “transparent
film” as the kind of paper if you print on
Windows.

12 3 45

Samsung Electronics 8-10

8-5. Defective Operation

PROBLEM ITEMS TO BE CHECKED HOW TO SOLVE

LCD does not
display
(operation panel)

Cannot enter by
keys(operation
panel)

LF MOTOR does
not operate.

CR MOTOR does
not operate.

TX MOTOR does
not operate.

Paper Jam

• Powered up?

• VCC(+5v) M+4.5V?

• Is the level of U16-130(_POR) high
(more than +4V)?

• Check Main to OPE harness and
J3(main).

• Is the level of U16-153 (_RST_OUT)
high (more than +4V)?

• Is the level of U18-31 (_OPE_RST)
high (more than +4V)?

• Check control signals of U16-124,
125(OPE_TXD, OPE_RXD).

• Refer to 4-7 of “LCD does not display”.

• Check OPE key contacts.

• Check the control signals of U16­141~145.

• Check input signals and driving output
of U1 and U2.

• Check the control signals of U16­31~36.

• Check input signals and driving output
of U25 and U28.

• Check the operation of the document
sensor of OPE PBA.

• Check the operation of TX Motor.

➀

Check the control signals of U18­105~110.

➁

Check input signals and driving out­put of U23 and U24.

• Check sheet feeder and ejector.

• Check the operation of LF motor.

• Check paper exit sensor.

• Check power.(SMPS)

a

Check if the cord is connected.

b

Check each power channel. (+5V,
+11.75V, +30V)

• Check power harness.

• Check the circuit around U103.

• Replace defective parts.

• Check the state of data bus of U16.:
Replace the main PBA.

• Check the circuit around U18.

• If signals of OPE_TXD are defective,
replace the main PBA. If signals of
OPE_RXD is defective, replace OPE
PBA.(Refer to circuit explanation.

• Refer to 4-7 of “LCD does not display”.

• Replace OPE.

• If control signals are not made when the
other functions are normal, replace the
main PBA.

• If driving output is defective when input
signals are normal, replace U1 and U2.

• If control signals are not made when the
other functions are normal, replace the
main PBA.

• If driving output is defective when input
signals are normal, replace U25 and
U28.

• If defective, replace the sensor.

• ➀If control signals are not made when

the other functions are normal, replace
the main PBA

➁

If driving output is defective when the
other functions are normal, replace

U23 and U24.

• Get rid of jammed paper.

• Refer to “LF motor does not operate.”

• If the sensor senses paper exit when it
operates normally, replace the main
PBA.

Samsung Electronics 8-11

PROBLEM ITEMS TO BE CHECKED HOW TO SOLVE

Document Jam

No Paper

No Document

No Cartridge

Bad Cartridge

Ink low

Can’t PRINT

• Check document feeder.

• Check the operation of TX motor.

➀

Check the control signals of U18­105~110.

➁

Check the input signals and driving
output of U23 and U24.

• Paper Empty?

• U18-48 is HIGH? (+4V or over)

• No document?

• Check the document sensor of OPE
PBA.

• Check if ink cartridge is installed.

• Check contacted part of the head.

• Check head checking circuit and
driver.: Check U16-8,9,10,128,154,156,
U18-103 control signals and head data.

• Check if ink cartridge is defective.

• Check the output level of U22-1.

• Check the amount of ink.

• Check centronics cable connection.

• Check what type of print driver has
been installed.

• Check I/F part of parallel port.

➀

Check the initial state of J2 print
control signal of CON8.: No.1,

10 - 14, 31, 32, 36

➁

Check input and output signal of U4.

➂

Check input and output signals of
U16-43 ~ 51 and U16-53 ~ 61.

• Remove jammed documents and insert it
again.

• ➀If control signals are not made when

other functions are normal, replace
the main PBA

➁

If driving output is defective when
input signals are normal, replace U23

and U24.

• Feed paper.

• If high, replace the paper empty sensor.
If low, replace the main PBA.

• Insert documents.

• If high, replace the document sensor. If
low, replace the OPE PBA.

• Insert ink cartridge.

• Clean it.

• Replace the main PBA.

• Replace ink cartridge.

• If low, replace the main PBA.

• Replace ink cartridge using ‘cartridge’
key.

• Connect it correctly.

• Install the print driver again and reboot
the system.

• Replace the main PBA.