Samsung SF4300 Troubleshooting

Samsung Electronics 1-1

PROBLEM ITEMS TO BE CHECKED HOW TO SOLVE

6. REPAIR

6-1. SCANNER

Black data when
you scan or copy

Bright image

Dark image

Lamp blinks

Cannot turn on the
lamp

Overlapped or omit­ted image when you
scan or copy

Black in whole
when you scan or
copy

White lines when
you scan/copy.

Does the lamp operate normally while
shuttle module operates?

Check if white ref. panel is too dirty.

1. Is the lamp supplied with appropri­ate power when the scanner oper­ates?

2. Does the output of module satisfy
specifications?

3. Does (-)Vref value satisfy specifica­tions?

Check power of the lamp. (12V serial
connection)

Check the power of the lamp. (12V
serial connection)
Check scan connector on circuit board.

Check if screws of CR fixing part are
loose.
Check if LF connector is properly
connected.

Check the scanner of the main board.
Check scanner cable.
Check the scanner.

Check if there is foreign substances on
LABEL(P)-REFERENCE.

- Check module lamp.

- Check FPC of the main board & module.
(J1-1<=> CON2-1: LAMP ON)

- Check the path of the main board.
(U17[#10]->R185[1K]-Q8->R262->Q7­> CON2[#1])

- Replace module.

- Replace the main board.

- Clean white ref. panel.

- Replace white ref. panel.

1. Check the lamp-on level of module

and the main board.(+11.75V/ + 5V)

(J1-1<=> CON2-1: LAMP ON)

2. Check video signal output of module

and main board.

3. Check (-) Vref value.

Replace FPC-SCAN connecting power
of the lamp.
Replace the scanner.

Check the power of the lamp.
Replace the scanner. Connect the
connector.

Screw down

Connect LF connector.

Replace the main board.
Replace FPC-SCAN.
Replace the scanner.

Wipe LABEL(P)-REFERENCE.

1-2 Samsung Electronics

PROBLEM ITEMS TO BE CHECKED HOW TO SOLVE

6-2. SENSOR

Black data when
you scan/copy

CanÕt print/copy
with No Paper dis­played

Does the carriage operate normally and
go to the initial place, when you turn it
on with the carriage placed in the
middle?

- Is No Paper cleared when you press
No Paper sensor on ASF?

- Does the level of CON7-#2 turn from
H to L when you press No Paper
sensor on ASF?

- Check connection between the sensor
board of the carriage and the main
and check if FPC cable is damaged.

- Check if FPC is connected properly
with CN1 of the sensor board.

- Check if the signal of the sensor is
delivered well to CN1-#2 of the sensor
board.

- Replace FPC cable.

- Replace the sensor board.

- Check connection with CON7 of the
main board.

- Replace No Paper sensor on ASF.

PROBLEM ITEMS TO BE CHECKED HOW TO SOLVE

6-3. PAPER FEED

Automatic sheet
feeder feeds paper
but paper is not sup­plied to the engine.

Automatic sheet
feeder cannot feed
paper.

CanÕt feed envelopes

Tilted Printing

- Check if actuator feed operates per­fectly.

- Check if paper sensing optical sensor
is normal.

- Check if stopper clutch operates
perfectly.

- Check if too much paper has been
supplied.

- Check if pickup roller rubber of the
automatic sheet feeder is worn out.

- Check the location of the envelope
guide of automatic sheet feeder.

- Check if paper guide of the automatic
sheet feeder is adjusted to the size of
paper.

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

- Replace the paper sensing optical
sensor.

- Replace stopper clutch assembly.

- Supply appropriate amount of
paper(100 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.

Samsung Electronics 1-3

6-4-1 White lines on letters or graphics.

■ Cause

If nozzles in print head has a probkem, white lines are marked on the print.
ÔSelf-diagnostic printingÕ will let you know if nozzles have problems.

6-4. PRINTING QUALITY

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

■ Solution

1) Run Ôprint control panelÕ to Òclean cartridgeÓ 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 thereÕs 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.