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Troubleshooting
Service Manual
7-1
Samsung Electronics
7
7
7. Troubleshooting
7.1 Scanner
7.1.1 COPY
White copy • Check the Scan-Cover open. • Room light can transit a thin original.
• Check shading profile. • Remake shading profile in the tech mode.
Black copy • Check the CCD problem in Main PBA. • Check the CCD harness contact.
• Check shading profile. • Remake shading profile in the tech mode.
Defective image quality • Check shading profile. • Remake shading profile in the tech mode.
• Check the gap between original and scanner. • The gap above 0.5mm can cause a
glass blurred image.
• Check printing quality. • See “Print” troubleshooting.
Abnormal noise • Check the Scanner Motor and any mechanical • Check the right position of the Scanner
disturbance. Motor, and check the any mechanical dis
turbance in the CCD carriaging part.
• Check the Motor Driver in Driver PBA. • If any driver is defective, replace it.
PROBLEM ITEMS TO BE CHECKED. HOW TO SOLVE
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Service Manual
Troubleshooting
7-2
Samsung Electronics
7.1.2 PC-Scan
Scanning Error • Check the printer cable installed. • Check correct installation, and use standard
IEEE1284 cable.
• Check how TWAIN driver is installed. • Remove any other scanner driver.
• Reboot after reinstallation of the TWAIN
driver.
• Check the printer port(Parallel). • Check the parallel-port-related items in the
CMOS Setup.
As a printer port, Select ECP among
SPP(Normal), ECP, and EPP
modes(increase print-ing speed)
• Check harness contact. • Check CN12 contact in Main PBA
• Check the IEEE1284 signal level. • If any signal level is defective, replace
Driver PBA.
Main PBA = 0.8V to 2.4V TTLsignal.
• Otherwise, replace Main PBA.
• Check the USB signal level. • If USB signal level is defective, replace
Main PBA.
Defective image • Check shading profile. • Remake shading profile in the tech mode.
Quality • Check the gap between original and scanner glass. • The gap above 0.5mm can cause a
blurred image.
Abnormal noise • Check the Scanner Motor and any mechanical • Check the right position of the Scanner
disturbance. Motor, and check the any mechanical
disturbance in the CCD carriaging part.
• Check the motor driver in Driver PBA. • If any driver is defective, replace it.
PROBLEM ITEMS TO BE CHECKED. HOW TO SOLVE
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Troubleshooting
Service Manual
7-3
Samsung Electronics
7.2 FAX (only SCX-6320F)
7.2.1 FAX/TELEPHONE Precautions
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 press “ OHD” key:
a) Check line cord connection.
b) Check MAIN LIU harness, and CN1
(LIU PBA).
• Check MAIN-LIU harness.
• Check DP control signal of MAIN PBA and Liu
PBA.
• Check MAIN LIU harness.
• Is the external phone hooked off?
• Check ‘hook off’ : Refer to ‘TEL LINE CANNOT
BE ENGAGED’ above.
• Check transmission path and reception path of
the LIU PBA.
• Is the ring checked?
• Refer to ‘Defective Transmission.’
a) insert it correctly into the connection jack
called “line”.
b) Replace defective parts.
• Replace defective parts.
• Replace LIU PBA.
• Replace defective parts.
• Replace LIU PBA if low.
• Refer to ‘TEL LINE CANNOT BE
ENGAGED’ above.
• Replace main PBA, if abnormal.
• Replace LIU PBA.
Replace main PBA.
• Replace LIU PBA if it cannot be checked.
• Refer to ‘Defective Transmission’.
PROBLEM ITEMS TO BE CHECKED. HOW TO SOLVE
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Service Manual
Troubleshooting
7-4
Samsung Electronics
7.3 Print Quality
Vertical black line and
band
1. Bad blade of Toner cartridge
2. LSU
3. Bad cleaning blade of drum cartridge.
1. Change Toner cartridge
2. Replace LSU
3. Replace drum cartridge.
Error Status Check Solution
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Vertical white line 1. LSU window contamination
2. Toner cartridge
1. Clean LSU window
2. If not LSU, change Toner cartridge.
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No image 1. GND OPC is well grounded?
2. LSU running well?
3. Biss voltage is normal?
4. Lower toner?
5. Is there video data from Main PBA
1. Measure the resistance between frame
ground and the ground spring attached frame.
Confirm stable ground. Unless bad ground,
detach cabinet, check where is bad point
2.Adjust LSU or replace it
3. Normal Dev bias = -450V
4. Shake toner cartridge and print.If a like
good, toner is empty
5. Test engine test pattern , replace Main PBA
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Light image 1. LSU light power normal?
2. Enough toner?
3. High charger voltage?
4. Lower bias voltage
5. Contamination of high voltage contact.
6. Transfer volatge and roller.
1. LSU light power check is difficult.
Compare with new one and check.
2. Check toner and the toner cartridge counter
3~4. Measure all high voltage output.
5. Leakage toner cause bad contact and
increase contact resistance. Clean contaminated area.
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Troubleshooting
Service Manual
7-5
Samsung Electronics
Dark image 1. LSU light power normal?
2. Bias voltage output is high?
3. Video data is always supplied?
4. Bad high charge voltage contact.
1. Check the rated level and replace.
2. Set to power rating.
3. Replace defected board.
4. Check the charge voltage or change the
drum cartridge.
Error Status Check Solution
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Background 1. High voltage output is normal?
2. C/R of drum cartridge is contaminated?
1. Adjust to the rated status.
2. Replace drum cartridge.
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Ghost 1. High voltage output.
2. Pre-Transfer Lamp.
3. Bad high voltage contact.
1. Check every high voltage.
2. Check the turn-on PTL, LED crash.
3. Clean the inside machine or replace drum
cartridge.
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Stains on back of
paper
1. Contamination of transfer roller.
2. Stains of paper path.
3. Pressure roller’s contamination.
1. Clean the transfer roller with vacuum cleaner.
2. Clean the area of paper path with cloth or
air cleaner.
3. Remove fuser and replace it.
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Service Manual
Troubleshooting
7-6
Samsung Electronics
Poor Fusing 1. Use recommended paper?
2. Check fusing temperature.
3. The machine was under the low tempera ture
for a long time?
1. Should use recommended paper.
2. Check engine controller board. If you have
not thermometer, measure the thermistor
voltage to CPU, If 2.3V±5% in printing CPU
works well. Then, disassemble fuser and
check the thermistor contact and thermistor.
3. Re-check after putting the machine in the
warm place for certain period.
Error Status Check Solution
Partial blank image
(not periodic)
1. Toner is low?
2. The toner cartridge is out of position?
1. Replace Toner cartridge.
2. Checkand adjust.
Partial blank image
(periodic)
1. Develop roller scar or particle.
2. Scar or particle. (94.3 mm)
3. Transfer roller scar or particle. (56.6 mm)
1. Replace toner cartridge.
2. Replace drum cartridge.
3. Replace transfer roller.
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Different image density
(left and right)
1. Charge roller’s pressure force unbalance
2. Dev. roller and OPC or Dev. roller and blade’s
pressure force unbalance
3. Transfer roller’s pressure force unbalance of
each side
1. Replace drum cartridge.
2. Replace toner cartridge and drum cartridge.
3. Check left and right spring of transfer roller
and the spring pressing the toner cartridge
inside the machine
Horizonral band 1. Unstable high voltage contact
2. Charge roller’s contamination
3. Contamination of heat roller
4. Malfunction of LSU
1. Clean each contact and check good contact
2. Clean charge roller
3. Replace fuser unit
4. Check Main PBA.
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Troubleshooting
Service Manual
7-7
Samsung Electronics
Abnormal Image Printing and Defective Roller
If abnormal image prints periodically, check the parts shown below.
1 OPC Drum 94.3 mm White spot. Black spot
2 Charge Roller 38.3 mm White spot. Black spot
3 Supply Roller 43.8 mm Horizontal dark band
4 Develope Roller 54.3 mm Horizontal dark band
5 Transfer Roller 56.6 mm Black side contamination/transfer fault
6 Heat Roller 83.6 mm Black spot, White spot
7 Pressure Roller 91.0 mm Black side contamination
NO Roller Abnormal image period Kind of abnormal image
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Service Manual
Troubleshooting
7-8
Samsung Electronics
No Image
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
Main 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 defective
matters in the machine
Self test
pattern prints?
No image?
Self testing
is possible ?
Is the OPC
terminal of machine
is well-connected
to Frame?
Does the
video data line to
LSU transit to High/Low
when printing?
Retest after replacing the
connector or controller board
A on
next page
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
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Troubleshooting
Service Manual
7-9
Samsung Electronics
Transfer roller might be out of its location
-> Locate the roller into its place
This could occurs 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
Transfer
voltage OK? (on the
transfer roller
shaft)
Are the
connection terminal
and connection
correct?
Repair or replace terminal
Replace HVPS or repair defective component
Is the connection
terminal OK?
Replace HVPS or repair
defective component
Repair or replace terminal
Developing
(-450V) and supplying
(-600V) voltage
are OK?
Does the
counter indicate over
the toner’s guaranty
life
Replace the toner cartridge
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
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Service Manual
Troubleshooting
7-10
Samsung Electronics
All Black
All black in
printing area?
Is charge
voltage supplied
from HVPS?
Is the
Hsync signal received
in LSU?
Charge part’s contact
is bad -> Repair or
replace the drum 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
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Digital Printer
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Troubleshooting
Service Manual
7-11
Samsung Electronics
Vertical White Line (Band)
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
toner cartridge 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
YES
YES
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