Samsung ML-6000 Service Manual

Samsung Electronics 1-1

1. Precautions

1-1 Safety Precautions

Read each caution carefully:

1. Do not use this printer near water or when
exposed to inclement weather.

2. Do not place this printer on an unstable cart, stand
or table; the product may fall, causing serious
damage to the product.

3. Slots and openings in the cabinet are provided for
ventilation. To ensure reliable operation and to
protect the printer from everheating, do not block
or cover any of these openings. Do not place the
printer in an enclosure unless the enclosure
provides adequate ventilation.

4. Never push objects of any kind into the printer
through the cabinet ventilation slots as they may
touch dangerous high voltage points, create short
circuits, cause a fire, or produce an electrical shock.
Never spill liquid of any kind on the printer.

5. Do not place the printer in a location where
someone may trip on the cords.

6. Select a work surface that is large enough to hold
the printer.

7. Position the printer within six feet of the computer
and within five feet of an electrical outlet.

8. Operate this printer using the power source (110V,
220V, etc) indicated on the marking label. If you are
not sure of the type of power source available,
consult your dealer or local power company.

9. If you need to use an extension power cord with
this printer, make sure that it uses a three-wire
grounded cord and that the total ampere ratings
for all of the products using the extension do not
exceed the extension cord ampere rating. Also,
make sure that the total of all products plugged
into the wall outlet does not exceed 15 amperes.

10. Do not allow anything to rest on the power cord

or data communications cable.

11. Unplug this printer from the wall outlet before

cleaning. Do not use liquid cleaners or aerosol
sprays. Use a damp cloth for cleaning.

12. Do not touch the surface of the photo-sensitive

drum as marks or scratches may impair print
quality.

13. Do not expose the drum unit to direct light for
prolonged periods.

14. Use only standard papers, OHP films, and
approved envelopes. Feed OHP films though the
manual feed slot only. See specifications for
approved papers and envelopes.

15. Other than replacing consumables such as paper
and toner, refer all questions to qualified service
personnel.

LASER STATEMENT (LASERTURVALLISUUS)

WARNING : NEVER OPERATE AND SERVICE THE PRINTER

WITH THE PROTECTIVE COVER REMOVED
FROM LASER/SCANNER ASSEMBLY. THE
REFLECTIVE BEAM, ALTHOUGH INVISIBLE, CAN
DAMAGE YOUR EYES.

Class 1 laser product

Luokan 1 laserlaite
Klass 1 laser apparat

Allonpituus 770-795nm
Teho 0.3mW±0.03mW

CAUTION

VORSICHT

ATTENTION

ATTENZIONE

PRECAUCION

CAUTION : Avoid exposure to invisible laser radiation when the

development unit is not installed.

INVISIBLE LASER RADIATION WHEN
THIS COVER OPEN. DO NOT OPEN
THIS COVER.

UNSICHTBARE LASERSTRAHLUNG,
WENN ABDECKUNG GEOFFNET.
NIGHT DEM STRAHL AUSSETZEN.

REYONNEMENT LASER INVISIBLE EN CAS
D’OUVERTURE. EXPOSITION DANGERUSE AU
FAISCEAU.

RADIAZIONE LASER INVISIBLE IN CASO DI
APERTURA. EVITARE L’ESPOSIZONE LAFASCIO.

REDIACION LASER INVISIBLE CUANDO SE
ABRE. EVITAR EXPONERSE AL RAYO.

1. Before disassembly, pull the power plug from the AC
power connector.

2. To avoid spilling toner inside the machine, do not
turn the printer over or on its side before removing
the developer cartridge.

3. Faulty installation of DRAMs may cause permanent
damage to the Laser Printer.

4. Use only+5V power for video controller-related
circuitry.

5. When replacing parts, use only the same type of part
as the original. Replacing components with a second
vendorÕs part may cause faulty operation.

6. Check the insulation between the blades of the AC
plug and accessible conductive parts (examples :
metal panels and input ports).

7. Insulation Checking Procedure:
Disconnect the power cord from the AC power
source. Connect an insulation resistance meter (500V)
to the blades of the AC plug.

The insulation resistance between each blade of the
AC plug and accessible conductive parts (see left)
should be greater than 1 megaohm.

8. Never defeat any of the B+ voltage interlocks. Do not
apply AC power to the unit (or any of its assemblies)
unless all solid-state heat sinks are correctly installed.

9. Always connect a test instrumentÕs ground lead to the
instrument chassis ground before connecting the
positive lead; always remove the instrumentÕs ground
lead last.

1-2 Samsung Electronics

Precautions

1-2 Servicing Precautions

Note : Requirements for AC power are described on the label affixed to the rear of the printer. Check the AC

voltage rating requirement before use.

CAUTION : Be sure the power is off to the

chassis or circuit board, and
observe all other safety precautions

1. Immediately before handling any semiconductor
components assemblies, drain the electrostatic charge
from your body by touching a known earth ground.
Alternatively, wear a discharging wrist strap device.
(Be sure to remove the strap before applying power to
the unit under test to avoid potential shock.)

2. After removing ESD-equipped assembly, place it on a
conductive surface such as aluminum foil to prevent
accumulation of an electrostatic charge.

3. Do not use freon-propelled chemicals. These can
generate electrical charges sufficient to damage ESDs.

4. Use only a ground-tip soldering iron when soldering
or desoldering ESDs.

5. Use only anti-static solder removal device. Some
solder removal devices are not rated as Òanti­static;Óthese can accumulate sufficient electrical
charge to damage ESDs.

6. Do not remove a replacement ESD from its protective
package until you are ready to install it. Most
replacement ESDs are package with leads that are
electrically shorted together by conductive foam,
aluminum foil or other conductive materials.

7. Immediately before removing the protective 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. Minimize body motions when handling unpackaged
replacement ESDs. Motion such as your clothes
brushing together, or lifting a foot from a carpeted
floor can generate enough static electricity to damage
an ESC.

9. Handle ICs and EPROMs carefully to avoid bending a
pin.

10. Pay attention to the direction of parts when mounting

or inserting them on a PCB.

11. Components can be permanently damaged if heated

for longer than necessary while welding. All
components are susceptible to heat damage.

1-3 ESD Precautions

Some semiconductor (Òsolid stateÓ) devices are easily damaged from static electricity. Such components
commonly are called Electrostatically Sensitive Devices (ESDs); examples include integrated circuits (ICs),
Large-Scale Integrated circuits (LSIs), some field-effect transistors, and semiconductor chip components. The
following techniques will reduce the occurrence of component damage caused by static electricity: