Samsung SF 5100, SF5100P Troubleshootin

5. Maintenance & Troubleshooting

5-1 Preventative Maintenance

The cycle period outlined below is a general guideline for maintenance. The example list is for an average
usage of 50 transmitted and received documents per day. Environmental conditions and actual use will vary
these factors. The cycle period given below is for reference only.

Samsung Electronics 5-1

COMPONENT CLEANING CYCLE REPLACEMENT CYCLE SOLUTION

SCANNER

PRINTER

ADF Rubber
ADF Roller
White Roller
CIS
Cartridge
Pickup Roller
Feed Roller
Transfer Roller
Fuser
Driver

6 Months
1 Year
As Needed
As Needed

5,000 Pages
10,000 Pages
10,000 Pages

2,500 Pages
60,000 Pages
60,000 Pages
60,000 Pages
60,000 Pages
60,000 Pages

5-2 Diagnostics

This section describes methods and procedures to isolate the cause of a malfunction in the machine. This
machine displays diagnostic information on the LCD. In addition, it can perform a series of tests that allow the
machine to observe individual machine functions.

5-2-1 Error Messages

Error Message Description Solution

5-2 Samsung Electronics

Maintenance & Troubleshooting

DOCUMENT JAM

DOOR OPEN

LINE ERROR

LOAD DOCUMENT

LSU ERROR

The loaded document has jammed in
the feeder.

Clear the document jam.

The top cover is not securely latched.

Press down on the cover until it

clicks in place.

Your unit cannot connect with the
remote machine, or has lost contact
because of a problem on the phone line.

Try again. If failure persists, wait an

hour or so for the line to clear, then

try again.

Or, turn the ECM mode on.

You have attempted to set up a
sending operation with no document
loaded.

Load a document and try again.

There occurs a problem in the LSU
(Laser Scanning Unit).

Unplug the power code and plug it

back in. If the problem still persists,

please call for service.

FUSER ERROR

There occurs a problem in the fuser
unit.

Unplug the power code and plug it

back in. If the problem still persists,

please call for service.

MEMORY FULL

The memory is full.

Either delete unnecessary documents,

or retransmit after more memory

becomes available, or split the

transmission into more than one

operation.

JAM/NO CARTRIDGE

Recording paper has jammed inside the
unit, or the toner
cartridge is not installed.

Clear the jam, or install the

cartridge

NO ANSWER

The remote machine has not answered
after all the redial attempts.

Try again. Make sure the remote

machine is operational.

NO. NOT
ASSIGNED

The one-touch or speed dial location
you tried to use has no number
assigned to it.

Dial the number manually with the

keypad, or assign a number.

Samsung Electronics 5-3

Maintenance & Troubleshooting

Error Message Description Solution

NO PAPER

The recording paper has run out. Load the recording paper.

OVER HEAT

The printer part in your unit
has overheated.

Please wait until it cools down.

If you cannot solve the problem, please

call for service.

PAPER JAM 2

POLLING ERROR

POWER FAILURE

WARMING UP

Jammed paper still remains
inside the unit.

Clear the jam.

The remote fax machine you
want to poll is not ready to
respond to your poll.

Or
When setting up to poll another

fax machine, you have used an
incorrect poll code.

The remote operator should know

in advance that you are polling and

have their fax unit loaded with the

original document.

Enter the correct poll code.

A power failure has occurred.

If documents have been stored in the

memory, a ‘Power Failure Report’ will

be printed automatically when the

power is restored.

TONER EMPTY

The printer is warming up and
is off-line.

Wait until the printer is on-line.

The toner cartridge has run out.
The machine stops.

Replace with a new toner cartridge.

TONER LOW

The toner is almost empty.

Take out the toner cartridge and

gently shake it. Using this way, you

can temporarily re-establish the

print quality.

RETRY REDIAL ?

The machine is waiting for a
specified time interval to redial
a previously busy station.

You can press Start to immediately

redial, or Stop to cancel the redial

operation.

RECEIVE ERROR

A fax has not been received
successfully.

A problem with the facsmile

communications has occurred.

Try again.

SEND ERROR

Your fax has not gone through
successfully.

A problem with the facsmile

communications has occurred. Ask

the sender to try again.

PAPER JAM 0

Recording paper has jammed in
the paper feeding area.

Press Stop and clear the jam.

5-4 Samsung Electronics

Maintenance & Troubleshooting

SAMPLE OF APROTOCOL DUMP LIST

5-2-2 Maintenance List

A number of reports can be printed from the fax
machine within the test mode. The protocol list all
contain detailed information which may be required
when contacting technical support.

To printout the protocol list :

1. Get into the Tech mode by pressing Setup, #, 1,
9, 3, 4.

2. In Tech mode, press Report/Help.

3. Press or repeatedly until you find the
Protocol List. When you find ‘PROTOCOL LIST’,
press ENTER. SAMPLE OF APROTOCOL
DUMP LIST

S NSF 61005820003380140200001302090018010000

S/R FCF FIF DATA ASCII

S CSI 2020202020202020202020202O20202020202020

S CSI 202020202020202020202022O202020220202020
R TSI 2020202020202020202020202O20202020202020

S DIS 00000000 01110111 00010111 00100010

S DIS 00000000 01110111 00010111 00100010
R DCS 00000000 01100001 00010101 00000000
R TSI 2020202020202020202020202O20202020202020

R DCS 00000000 01100001 00010101 00000000
S CFR
R MPS
S MCF
S DCN

S FTT

S NSF 61005020003380140200001302090018010000

PROTOCOL DUMP LIST OCT-20-1999 06:35

Sending/Receiving

Name of signal
(Facsimile Control Field)

Facsimile Information Field
data described in hexdecmal code

FIF data described
in ASCII code

Samsung Electronics 5-5

Maintenance & Troubleshooting

When you replace the main board to new one, the
information on the toner state is cleared. Therefore,
you should update the information to the new
board by entering the exact value of total toner
count and specifying the toner cartridge installed
currently is shipped with the machine or new. If not,
‘TONER LOW/EMPTY’ message may not appear
when the toner is run out.

1. In Tech mode, print ‘SYSTEM DATALIST’. The
list includes the total toner count and CRU state
information.

- TOTAL TONER COUNT: The total number of

the dots used to print up to current time.

- CRU STATE: The page number which the toner
cartridge can print. (The yield of a new toner
cartridge is approximately 2,500 pages and that
of the cartridge supplied with the machine is
approximately 1.000 pages.)

2. Replace Main board.

3. In Tech mode,

3-1) Press Setup, and find ‘MAINTENANCE’ by

pressing repeatedly or , then press
Start/Enter.

3-2) When ‘TONER COUNT’ is displayed in LCD,

press Start/Enter, and enter the value of the
total toner count in the system data list.

3-3) When you are prompted to enter CRU

STATE, press Start/Enter.

3-4) When you see ‘[1.1000 2.2300]’ in LCD, select

the value of the CRU state in the system data
list.

4. In Tech mode, print ‘SYSTEM DATALIST’ and
make sure that the toner information is updated.

5-3 Print Quality

5-4 Note for replacing Main board

No Roller Abnormal image period Kind of abnormal image

1 OPC Drum 75.4mm

2 Charge Roller 37.7mm Black spot

3 Supply Roller 26.8mm Horizontal density band

4 Develope Roller 31.6mm Horizontal density band

5 Transfer Roller 47.1mm Black side contamination/transfer fault

6 Heat Roller 50.1mm Black spot, White spot

7 Pressure Roller 50.2mm Black side contamination

•White spot on black image

•Black spot

5-6 Samsung Electronics

Maintenance & Troubleshooting

Vertical black line and band

YES

NO

YES

OK after

replacing the LSU?

Remove part on the paper
path causing the trouble

NO

OK after replacing

developer?

Any obstacles on

the developer blocking

the laser beam.

OK after

removing the

obstacles?

Any obstacles ON

mirror lens of LSU and

laser path?

Remove the obstacles.

Replace the LSU

Replace the developer

END

YES

YES

YES

NO

NO

NO

5-5 Troubleshooting Flow Chart

Samsung Electronics 5-7

Maintenance & Troubleshooting

Check connection to
computer or replace
controller

Take out the cartridge
and prepare the tester
for electronic connection

Repair or replace the GND
terminal

Check the path between
video controller, engine board
and HVPS. Repair or replace
the defective component
or board

The mirror in LSU might be
misplaced so the light path to the
OPC deviates ->Repair or replace
LSU or remove any deffective
matters in the machine

Self test

pattern prints?

No image?

Self testing

is possible via

Tech Mode?

Is the OPC

terminal of machine

is well-connected

to Frame?

Does the

video data line to

LSU transit to High/Low

when printing?

Re-test after replacing the
conector or Main board

A on

next page

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

No Image

5-8 Samsung Electronics

Maintenance & Troubleshooting

Transfer roller might be out of its location

-> Locate the roller into its place
This could occurrs when he power of LSU is low or

the density is low due to the obstacles on the window

-> Replace LSU or clean the window

A

Trnasfer

voltage OK? (on the

transfer roller

shaft)

Is the

connection of

OPC GND and Frame Ground

correct? (less than

10 ‰)

Are the

connection terminal

and connection

correct?

Repair or replace terminal

Replace HVPS or repair defective component

Is the connection

terminal OK?

Check the connection of

frame Ground and OPC GND

Replace HVPS or repair defective component

Repair or replace terminal

Developing

(-350V) and supplying

(-550V) voltage

are OK?

Does the

counter indicate over

the toner’s guarranty

life

Replace the toner cartridge

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

Samsung Electronics 5-9

Maintenance & Troubleshooting

Replace the developer

NO

YES

YES

END

YESYES

NO

NO

NO

YES

YES

NO

Replace the HVPS

Ok after setting to the

normal mode?

YES

NO

Remove the obstacles

NO

YES

Clean transfer roller
and gear holder

YES

NO

Replace the LSU

Replace the developer

Is it not over

the guaranty life of dot

counter?

Is the toner save

mode or the light mode

is selected?

Is the high voltage

normal? (charging,

developing,

transfer)

Any obstacles on the

gab between high voltage

terminal and

developer?

Transfer roller

works OK?

OK after replacing

LSU?

HVPS works OK?

Light image

Samsung Electronics

Maintenance & Troubleshooting

5-10

All black in

printing area?

Is transfer

voltage supplied

(-1.55 KV)?

Is the

Hsync/ signal received

in LSU?

Transfer part’s contact
is bad -> Repair or
replace toner cartridge

Does the

video data line to LSU

transit to High/Low when

printing?

Replace LSU

Check the path among video
controller, engine board,
HVPS, LSU for the shortage
or open -> Repair or replace
the boards

Repair or replace HVPS

Replace LSU

NO

NO

NO

NO

YES

YES

YES

YES

All Black

Samsung Electronics 5-11

Maintenance & Troubleshooting

White line

missing definitely?

Dirt of dust stuck onto the window of internal
lens of LSU

-> Clean it or replace LSU

Preventive obstacles through the path between
OPC of developer and LSU prevent the path

-> Remove the obstacles

Check if the

printout is still has the

same problem even right after

passed through the

transfer roller

Toner material might be stuck to blade in the developer
inside and it prevents toner supply

-> Replace the toner cartridge

Check both if the toner cartridge’s counter is over its
guaranty and amount of the toner material

-> Replace the toner cartridge

The ribs in fuser or toner on the roller may invoke
the image problem

-> Replace the fuser cover or the defective part
The image is originally black or the black part is

far close to the top

-> Use the pattern which has the image below bigger
than 10mm from the top

NO

NO

END

NO

YES

Does the problem

persist?

YES

YES

Vertical White Line (Band)

5-12 Samsung Electronics

Maintenance & Troubleshooting

Dark selected

via RCP?

Change to

Normal and test

Works cor

with -350V of Bias

voltage?

Works
correctly after
replaced LSU?

Repair or replace the defective
component

The power of LSU is set
high or internal problem

-> Replace LSU or adjust
voluem

Same at Normal?

END

NO

NO

NO

Toner over supply due to the
adjustment fault of metering
blade in developer

-> Replace developer

NO

YES

YES

YES

YES

Dark Image

Samsung Electronics 5-13

Maintenance & Troubleshooting

Recommended

paper used?

Is pressure of

transfer roller too high?

Does the operation of

TR work properly?

Transfer,

charge and developing

voltage are OK?

Operating/

storage atmosphere is

too high temperature

/humidity?

Solve the problem under
the recommended condition
(10-32 degree Centigrade)

Dirt or

dust around the

charge roller?

Clean the charge roller
or replace step-up device
/terminal after check

Work OK?

Internal blade or suppying
part of the developer is
defective

-> Replace the toner cartridge

Check Terminals or contacts and ’Guide-Deve Spring’
are misplaced

-> Repair or replace transfer roller etc.

Print 20 to 30 pages using
the recommended paper

Same problem

occurs?

- Adjust voltage or replace HVPS

- Repair or replace after checking the
terminals’ contacts

Replace transfer
roller’s holder

END

Replace the
toner cartridge

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

YES

Background

5-14 Samsung Electronics

Maintenance & Troubleshooting

Is it regular

interval of 75.4mm?

Irregularity of NIP
between rollers in
developer

-> Replace developer

Clean heat roller
or replace it

Clean transfer roller’s holder and
TR drive gearor replace TR holder ass’y

Clean TR drive
and OPC gear

END

A specific part of the transfer roller has
ruined or its resistance value is changed

-> Replace transfer roller

Transfer roller cannot force regularly due
to the gears eccentricity of transfer roller

-> Replace the defective component

Adjust the Bias
voltage or replace HVPS

There may be a problem in toner
layer control in toner cartridge

-> Replace the developer

Use the machine with
recommended paper and
at condition

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

NO

YES

YES

YES

YES

Check HVPS
contacts and
HVPS’s self-output

-> If failed, repair/
replace HVPS

- Repair or replace HVPS

- Check and Repair or
replace the terminal
contacts

NO

NO

Is it regular

interval of 31.6mm?

Is it regular

interval of 47mm?

(as transfer roller

interval)

Is it regular interval of

50.4 mm?

Does

the operation

of TR work properly?

Transfer

voltage is set to

standard?

Does the same

problem persist?

Developing

/suppying voltage

normal? (-350V/

-550V)

Bias voltage

is OK? (-350V)

Operating/storage

temperature is too low or

not recommended

paper used?

Ghost

Samsung Electronics 5-15

Maintenance & Troubleshooting

The problem occured
since the obstacles
stuck to charge roller

-> Replace toner cartridge

When taking

out the cartridge,

toner leaks?

Toner leaks and toner
material dropped onto
the paper -> Replace the
developer

Bad image

removes by

scratching?

Check toner is stuck onto
the P/R or H/R in fuser

-> Clean it or replace

The problem
randomly occured
due to the toner
fallen -> Clean the
machine

Remove obstacles
stuck on OPC
drum’s surface

Perform the OPC
cleaning using
the control panel
buttons.

END

NO

YES

NO

NO

YES

NO

YES

Does the same

problesm

persist?

Is it regular

interval of 37.7mm?

Is it regular

interval of 75.4 mm?

NO

YES

YES

Black Spot

5-16 Samsung Electronics

Maintenance & Troubleshooting

NO

Black band?

The black

band has regular

interval?

Black band

is far about 10mm from

white band?

Problem of internal
contacts in OPC

-> Replace developer

The OPC is damaged under the
direct sunlight for around 5
minutes -> If the same problem
persists in 10 hours, replace
the developer

This occurs when no
Hsync/ at LSU

-> Replace LSU

75.4 mm interval?

Heat roller is ruined

-> Replace the roller

The OPC is damaged due to
the irregular transfer voltage
of HVPS

-> Repair/replace HVPS

-> If the same problem persists,
replace the developer

Does it appear

at every 56.1mm at

specific place?

Problems of terminal contact,
transfer voltage supplying,
and transfer roller’s due to the
charge roller is ruined (37.7mm)

-> Repair/replace HVPS,
developer

NO

NO NO

NO

YES

YES

YES

YES

Horizontal Band

Samsung Electronics 5-17

Maintenance & Troubleshooting

Transfer roller

is clear ?

Clean the transfer roller

NO

YES

Paper path is

clear ?

Clean the paper path

Clean the pressure roller

NO

YES

Toner Contaminations on Back of Paper

5-18 Samsung Electronics

Maintenance & Troubleshooting

Is it not over

the guaranty life of dot

counter?

Replace the toner cartridge

NO

YES

YES

YES

Is toner cartridge

installed correctly?

Install the toner cartridge correctly

NO

Transfer roller

works properly?

Clean the TR holder, the TR gear,
OPC roller gear and the transfer roller

NO

- Clean the contact point of transfer roller

- Check the output of high voltage terminal
and adjust or replace if required

Partial Blank Image (not Periodic)

Samsung Electronics 5-19

Maintenance & Troubleshooting

Is it not over

the guaranty life of dot

counter?

Replace the toner cartridge

NO

YES

YES

NO

NO

Is toner

cartridge installed

correctly?

Install the toner cartridge
correctly

NO

Is it regular

interval of 47.1mm?

Transfer roller

works properly?

OK after

replacing the transfer

roller?

Is it regular

interval of 75.4mm, 31.6mm

or 37.7mm?

Replace the fuser
(50.2mm, 45.2mm or exit roller

- Clean the contact point of
transfer roller.

- Check the output of high
voltage terminal and adjust or
replace if required.

Replace the toner cartidge

END

YES

YES

NO

YES

NO

YES

Clean the TR holder, the TR
gear OPC roller gear and the
transfer roller

Partial Blank Image (Periodic)

5-20 Samsung Electronics

Maintenance & Troubleshooting

It is over the guaranty
life of toner cartridge
(Check the counter
and replace it)

Defective agitator in
the toner supplying part
of developer

->Replace the developer
Check if the ’guide deve

spring’ works OK and
repair/repalce

Check high voltage
output and repair/
replace terminals, HVPS

Irregualrity of toner
suppy from developer

-> Repalce developer

Light distortion due to
the mirror ruined or
LSU’s diffused reflection

-> Replace LSU

NO

NO

YES

YES

YES

YES

NO NO

OK after

taking out and

rocking the toner

cartridge?

When gray

pattern printing,

irregular density

persists?

transfer/

charge/developing

voltage drops while

printing?

Bad images

aroung the no image

area?

Irregular Density

Samsung Electronics 5-21

Maintenance & Troubleshooting

Is it regular

interval of 75.4mm?

Obstacles stuck on OPC’s
surface

-> Clean the OPC and
machine or replace
developer

When putting in/out the
developer, scratch is made

-> Replace the developer

Transfer

voltage is normal?

D/R in developing unit has
the defect

-> Replace the developer

Too high voltage supplied
due to the setting error of
transfer voltage

-> Adjust/replace HVPS

NO

NO

YES

YES

White Spot

5-22 Samsung Electronics

Maintenance & Troubleshooting

When multi-page OHP printng,
less than 10 films are
guranteed.

Use the recommended film

When OHP

printing, does the fan

temporarily stops

and revolves?

Use the recommended film

Other parts are touching the
fan and prevents it from
revolution

-> Check and repair

NO

NO NO

YES

Set to OHP mode

NO

YES

YES YES

Is the OPC

mode selected using

the software

application?

Recommended
OHP film used?

Inserted over

than 10 films into

the MPF?

Trembling at the End When OHP Printing

Samsung Electronics 5-23

Maintenance & Troubleshooting

After printing

completed, any error

related fuser?

Both ends

of thermostat

open?

Replace thermostat
and re-test

Replace the contol
component on engine
board

Check any contact
problem in thermistor
and repair

The machine

placed under the

severe low tempera

ture for a long

time?

Place the machine
at normal
temperature and
re-test

While printing,

the voltage of pin 208

of U5 (CPU) on Main

board is 2.0V

~2.3V?

Thermistor’s

contact is OK?

Open the top

cover. When black

printing, is the fuser NIP

width is 1.2~

3.0mm?

The paper used is too
thick or contains too
much cotton in it

-> Re-test with the
recommended paper

Check if the hardness of
P/R, and spring force is OK?
(spring’s force: 2.5 Kg)

Re-assemble

thermistor

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

Poor Fusing Grade

5-24 Samsung Electronics

Maintenance & Troubleshooting

Plug in the

power cord?

The power

voltage supplying is

the same as

rating?

The fan

revolves when

powered on?

LEDs blink
once when

powered on?

The On-Line

key is being pressed

or shortage on

the panel

board?

Repair/replace the
board

Check the voltage first and plug
the power cord

Supply the power as the rating

Connections

on board are OK?

Re-connect firmly
and re-test

The connection
error between
controller board
and panel board
or malfunction
of boards.

-> Replace the
boards

Fuse of SMPS

if open?

Shortage

between 5V and

GND, or between

24V and

GND?

Replace the fuse

Toner cartridge

is in the set?

Detect failure due to the
board which detects top
cover open or switch error

-> Replace the board or switch

Put in the
cartridge

Remove the shortage
or replace the board

NO

NO

NO

NO

NO

NO

NO NO

NO

YES

YES

YES

YES

YES

YES

YES

YES

YES

No Power (LCD NO display LED Off)

Samsung Electronics 5-25

Maintenance & Troubleshooting

Less than 10W?

AC is being supplied?

The voltage

of pin #208 of U5

(CPU) on the Main board

is about 2.3V when

printing?

END

Thermostat is open due to the heat etc.

-> Replace the thermostat

Check the PCI and fusing
control part and CN502
on the SMPS

-> Replace the component
or replace the SMPS

Measure the resistance
at the both ends of AC
Line with covers open

Remove the covers

Re-assemble the top
cover and close it

Thermistor, connecting point or engine
board defect -> Repair/replace the
component/board

NO

NO

NO

YES

YES

YES

Fuser Error

5-26 Samsung Electronics

Maintenance & Troubleshooting

Sounds the

solenoid on when starts

print?

Does the

paper move?

Does the

paper move more than

100mm?

The Engine board defected

-> Replace boards
The solenoid defected

-> Replace it

The pick-up unit is
assembled wrong

-> Re-assemble or replace
the unit

Feeder

sensor and paper

width detect sensor

are assembled

reverse?

Switch them

The Sensor board
defected

-> Repair/replace

Too many

papers in the

feeder?

Paper guides

fit the paper width?

Paper end curled?

Does the

extender pulled out?

<Recommendation>
Use the MPF for the thick
paper such as envelope
and cardstock

Reduce the amount
and re-test

Take out the paper
and re-insert

Use the recommended
and quality paper

Pull out the
extender

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

YES YES

Paper Jam (Mis-feeding)

Samsung Electronics 5-27

Maintenance & Troubleshooting

Paper

stopped before

the OPC?

Check the LSU and
if it has the defect
replace it

Paper

stopped before

the fuser?

Severe skew

when feeding?

Adjust the paper guides to fit the
paper width

The force of springs pressing the
developer is weak

-> Check guide-DEVE

The paper

came out through

between fuser and

developer?

Too thin

or sensitive paper to

static electricity?

Use the recommended
paper

Check guide transfer
is grounded Check
the shutter prevents
feeding

Check the input path
to the fuser (such as
mis-assembly)

The

actuator of

paper exit sensor

works OK?

Check the actuator exists and its
operation and around the engine board

-> Replace

Is the paper

rolled around the

presseure

roller?

Remove the fuser, remove
the paper and replace the
pressure roller, if necessary

Feeds

multiple pages?

Remove any factors

Check the roller
and ribs of fuser
are in place, and
remove burrs, if
any

-> Remove the
factors of jam

NO NO NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

YES

YES

Paper Jam (Jam1)

5-28 Samsung Electronics

Maintenance & Troubleshooting

Try again to connector
or
Replace connector

END

NO

Check

CBF Harness28P

(MAIN B’D to ENGINE

B’D)

YES

Check

MAIN B’D CN9-6,

HSYNC Signal

( )

Replace LSU

NO

YES

Check

MAIN B’D CN9-3,

P_MOTOR Signal

( )

Replace MAIN B’D

NO

YES

Check
MAIN B’D CN9-4,
LREDADY Signal

( )

Replace LSU

NO

YES

Check
MAIN B’D CN9-9,

LDON Signal

( )

Replace MAIN B’D

NO

YES

LSU Error