LASER PRINTER
ML-5000A
SERVICE Manual
LASER PRINTER |
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CONTENTS |
1. Precautions
2. Specifications
3. Disassembly and Reassembly
4. Troubleshooting
5. Exploded Views and Parts List
6. Electrical Parts List
7. Schematic Diagrams
ELECTRONICS
P/N. JC68-00015A Rev. 1.00
Contents
1. Precautions . . . . . . . . . . . . . . . . . 1-1
1-1 Safety Precautions . . . . . . . . . . . . . . . . . . . . . 1-1
1-2 Servicing Precautions . . . . . . . . . . . . . . . . . . . 1-2
1-3 ESD Precautions . . . . . . . . . . . . . . . . . . . . . . . 1-2
2. Specifications . . . . . . . . . . . . . . . 2-1
2-1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
2-2 Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
2-3 Print Quality . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
2-4 Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
2-5 Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4
3. Disassembly and Reassembly |
. . .3-1 |
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3-1 Removal Procedures . . . . . . . . . . . . . . . . |
. . . . 3-1 |
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3-2 Face-Up Cover and Front Cover . . . . . |
. . . . 3-1 |
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3-3 Panel Board and Board Cover . . . . . . . |
. . . . 3-3 |
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3-4 |
Transfer Roller . . . . . . . . . . . . . . . . . . . . |
. . . . 3-3 |
3-5 Top Cover and Rear Cover . . . . . . . . . . |
. . . . 3-4 |
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3-6 |
Side Covers (Left, Right) . . . . . . . . . . . . |
. . . . 3-4 |
3-7 SMPS/Engine Control Board . . . . . . . . |
. . . . 3-5 |
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3-8 |
Control Board . . . . . . . . . . . . . . . . . . . . |
. . . . 3-5 |
3-9 |
Joint Board . . . . . . . . . . . . . . . . . . . . . . . |
. . . . 3-6 |
3-10 |
Sensor Board . . . . . . . . . . . . . . . . . . . . |
. . . . 3-6 |
3-11 |
Gear Bracket . . . . . . . . . . . . . . . . . . . . . |
. . . . 3-7 |
3-12 |
Motor . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . 3-7 |
3-13 HVPS Board . . . . . . . . . . . . . . . . . . . . . |
. . . . 3-8 |
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3-14 LSU . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . 3-8 |
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3-15 |
Fuser . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . 3-9 |
3-16 Upper Frame . . . . . . . . . . . . . . . . . . . . |
. . . 3-10 |
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3-17 |
Pressure Roller . . . . . . . . . . . . . . . . . . . |
. . . 3-10 |
3-18 |
Pickup Roller . . . . . . . . . . . . . . . . . . . . |
. . . 3-11 |
3-19 |
Installing SIMM . . . . . . . . . . . . . . . . . . |
. . . 3-12 |
4. |
Troubleshooting . . . . . . . . . . . . . . |
4-1 |
4-1 Abnormal Image Printing and |
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Defective roller . . . . . . . . . . . . . . . . . . . . . . . |
.4-1 |
4-2 |
Print Quality . . . . . . . . . . . . . . . . . . . . . . . . . |
.4-1 |
4-3 |
Malfunction . . . . . . . . . . . . . . . . . . . . . . . . . . |
4-12 |
4-4 |
DCU Control . . . . . . . . . . . . . . . . . . . . . . . . . |
4-16 |
5. Exploded Views and Parts List . . 5-1
5-1 Main Exploded View . . . . . . . . . . . . . . . . . . . 5-2 5-2 Main Parts List . . . . . . . . . . . . . . . . . . . . . . . . 5-3 5-3 Front Cover Exploded View . . . . . . . . . . . . . 5-4 5-4 Front Cover Parts List . . . . . . . . . . . . . . . . . . 5-5
5-5 Top Cover Exploded View . . . . . . . . . . . . . |
. 5-6 |
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5-6 |
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Top Cover Parts List . . . . . . . . . . . . . . . . . . . |
5-7 |
5-7 |
Fuser Exploded View . . . . . . . . . . . . . . . . . . |
5-8 |
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5-8 |
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Fuser Parts List . . . . . . . . . . . . . . . . . . . . . . . |
5-9 |
5-9 |
Frame Exploded View . . . . . . . . . . . . . . . . . |
5-10 |
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5-10 |
Frame Parts List . . . . . . . . . . . . . . . . . . . . . |
5-11 |
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5-11 |
Feeder (1/2) Exploded View . . . . . . . . . . . |
5-12 |
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5-12 |
Feeder (1/2) Parts List . . . . . . . . . . . . . . . |
5-13 |
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5-13 |
Feeder (2/2) Exploded View . . . . . . . . . . |
5-14 |
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5-14 |
Feeder (2/2) Parts List . . . . . . . . . . . . . . . . |
5-15 |
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5-15 Motor Exploded View . . . . . . . . . . . . . . . . |
5-16 |
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5-16 |
Motor Parts List . . . . . . . . . . . . . . . . . . . . . |
5-17 |
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5-17 PCB Exploded View . . . . . . . . . . . . . . . . . . |
5-18 |
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5-18 |
PCB Parts List . . . . . . . . . . . . . . . . . . . . . . |
5-19 |
6. Electrical Parts List . . . . . . . . . . . .6-1
6-1 Controller (ML-5000A) . . . . . . . . . . . . . . . . . .6-1
6-2 Engine (220V) . . . . . . . . . . . . . . . . . . . . . . . . . .6-4
6-3 Engine (110V) . . . . . . . . . . . . . . . . . . . . . . . . . .6-7
6-4 Joint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-10
6-5 Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-11
6-6 Paper Empty . . . . . . . . . . . . . . . . . . . . . . . . .6-12
6-7 Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-13
7. Schematic Diagrams
7-1 Controller (ML-5000A) 1/7
Controller (ML-5000A) 2/7
Controller (ML-5000A) 3/7
Controller (ML-5000A) 4/7
Controller (ML-5000A) 5/7
Controller (ML-5000A) 6/7
Controller (ML-5000A) 7/7
7-2 Controller (ML-5000G) 1/2
Controller (ML-5000G) 2/2
7-3 OPE Panel (ML-5000A/G)
7-4 Engine (ML-5000A/G) 1/3
Engine (ML-5000A/G) 2/3
Engine (ML-5000A/G) 3/3
7-5 Joint Board (ML-5000A/G)
7-6 HVPS (ML-5000A/G) 1/3
HVPS (ML-5000A/G) 2/3
HVPS (ML-5000A/G) 3/3
7-7 Sensor (ML-5000A/G)
7-8 Switch (ML-5000A/G)
7-9 PTL (ML-5000A/G)
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.
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.
Samsung Electronics |
1-1 |
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.
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 vendor’s 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 instrument’s ground lead to the instrument chassis ground before connecting the positive lead; always remove the instrument’s ground lead last.
1-3 ESD Precautions
Some semiconductor (“solid state”) 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:
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 “antistatic;”these 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.
1-2 |
Samsung Electronics |
2. Specifications
2-1 General
Emulation |
PCL5e (ML-5000A), WPS (ML-5000G) |
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Interface (Parallel Port) |
Centronics IEEEP1284 compatible bi-directional (Nibble, Byte, ECP) |
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Print Speed |
8 PPM (A4 Size, 5 % Character Pattern) |
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Print Method |
Non-impact Electrophotography, Laser Beam |
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Resolution |
600 X 600 DPI |
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Memory |
Standard: 4 Mb (ML-5000A) / 1 Mb (ML-5000G) |
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Expandable up to 36 Mb for ML-5000A only |
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Operating Environment |
Temperature : 10 ~ 32.5 oC, |
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Humidity: 20 ~ 80 % RH |
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Storage Environment |
Temperature : -20 ~ 40 oC, |
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Humidity: 10 ~ 95 % RH |
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Weight |
Net : 7.5 kg (max.), |
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Gross : 9.5 kg (max.) |
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Dimension |
345 (W) X 364 (D) x 224 (H) mm |
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Certification & Compliance |
CE, TUV, SEMKO, NEMKO, DEMKO, C-tick |
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FCC, UL, CSA, CDRH, CB, EPA |
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Samsung Electronics |
2-1 |
Specifications
2-2 Electrical
Input Voltage |
AC 200~240 V ± 15 %, 50/60 Hz ± 3 Hz |
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DC Output Voltage |
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Line Regulation |
24 V ± 3 % |
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5 V ± 2 % |
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Load Regulation |
24 V - 3 %/+10 % |
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5 V ± 3 % |
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Ripple Noise |
24 V : 120 mV (Peak 400 mV) |
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5 V : 50 mV (Peak 100 mV) |
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Over Current Protect |
24 V : |
2.7 A ± 10 % |
(by C't ) |
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5 V : |
1.5 A ± 10 % |
(by C't ) |
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Power Consumption |
Max. 450 Wh |
Everage: 200 Wh |
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Power Save Mode: 25 Wh |
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Warming Up Time |
20 seconds or less |
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First Print Time |
Idle mode : 20 seconds or less |
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Power Save mode : 30 seconds or less |
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Acoustic Noise |
Standby : 36 dB or less |
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Sleep Mode: Background level |
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Operating : 48 dB or less |
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Reliability |
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Insulation Resistance |
10 Mohm or less |
(at DC 500 V) |
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Dielectric Strength |
AC 1500 V (DC 2100 V), 10 mA |
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Ground Continuous |
0.1 ohm or less |
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Voltage DIP |
Rated voltage ± 15 % |
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AC Impulse Noise |
AC 1000 V 10, 100, 200, 400, 1000 ns |
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Leakage Current |
3.5 mA or less |
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Surge |
0.5 ~ 4 kV, 0.25 ~ 2 kA |
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Ozone Emission |
0.1 ppm or less (8 hours) |
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Top Cover Open |
Isolating the input power of the LSU, high voltage part, and fuser |
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Overcurrent Protect |
Fuse inside the Engine Controller |
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Fusing System |
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Trouble Sensing |
The temperature doesn't rise to the specific temperature within a |
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specific time. Fuser error occurs if the temperature is too high. |
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Overheat Sensing |
240 ~ 250 oC (The thermostat cuts off the Fuser from the power.) |
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Thermistor Open Sensing |
Without the initial temperature change of the Fuser |
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Source of Light |
Laser Diode (LSU) |
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Developer |
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Developing |
Non-magnetic contact developing |
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Charging |
Conductive roller charging |
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Density Adjustment |
Dark, Medium |
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Transfer System |
Pre-transfer by LED & conductive roller |
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Fusing System |
Temperature & Pressure |
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Ozone Emission |
0.1 PPM or less (8 hours) |
2-2 |
Samsung Electronics |
Specifications
2-3 Print Quality
Conditions |
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Paper |
Normal paper (75 g/m2) |
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Environment |
Temperature : 20 ~ 25 oC, Humidity : 40 ~ 60 % RH |
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Print Quality |
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Image Density |
min. 1.3 |
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Background |
max. 1.0 |
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Uniformity |
max. 0.2 (including continuous print) |
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Fusing |
min. 80 % (all black) |
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Start Position |
Top : x ± 3 mm, Side : y ± 3 mm (from left) |
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Skew |
Top : max. ± 1.5 mm/200 mm |
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Side : max. ± 1.5 mm/250 mm |
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Orthogonality |
± 1.0 mm |
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Horizontal Scan |
± 0.6 mm/208 mm |
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(Bowed Line Skew : S600,0909 pattern) |
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Special Paper Exception |
Image Density : min. 1.0 (envelope) |
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Fusing : min. 70 % |
(all black, envelope/OHP/postcard) |
Paper Jam |
1/2,000 or less |
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Paper Curl |
First : 16 mm or less |
(10 sheets) |
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After Cooling: 12 mm or less (10 sheets) |
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2-4 Option
Toner Cartridge |
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Type |
One-cartridge type |
Life Span |
Built-in toner cartridge : 5,000 pages at 5 % coverage (ML-5000A) |
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3,000 pages at 5 % coverage (ML-5000G) |
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Optional toner cartridge: 5,000 pages at 5 % coverage |
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Note: Its duration may last longer under Econo mode. |
Memory (ML-5000A only)
Memory RAM: 2, 4, 16, 32 Mb (memory is expandable to 36 Mb) Note: Memory option is not available for ML-5000G.
Samsung Electronics |
2-3 |
Specifications
2-5 Paper
Input Paper Size
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Paper Type |
Size |
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Feeding Source |
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A4 |
210 x 297 mm |
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Paper Tray or Manual feeder |
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Letter |
216 x 279 mm |
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Paper Tray or Manual feeder |
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B5 (ISO) |
176 x 250 mm |
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Paper Tray or Manual feeder |
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Executive |
184 x 267 mm |
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Paper Tray or Manual feeder |
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Folio |
216 x 330 mm |
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Paper Tray or Manual feeder |
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Legal |
216 x 356 mm |
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Paper Tray or Manual feeder |
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Com-10 Envelope |
105 x 241 mm |
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Manual feeder only |
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Monarch Envelope |
98 x 191 mm |
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Manual feeder only |
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DL Envelope |
110 x 220 mm |
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Manual feeder only |
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C5 Envelope |
162 x 229 mm |
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Manual feeder only |
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C6 Envelope |
114 x 162 mm |
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Manual feeder only |
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A5 Envelope |
148 x 210 mm |
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Manual feeder only |
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Transparency |
A4 or Letter |
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Manual feeder only |
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Label paper |
A4 or Letter |
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Manual feeder only |
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*Others |
Width: 75-216 mm, Length: 125-356 mm |
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Paper Tray or Manual feeder |
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*ML-5000A only |
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Feeding Source |
Paper tray and manual feeder |
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Paper Weight |
60 ~ 163 g/m2 |
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Input Paper Capacity |
Paper tray: |
150 sheets, |
Manual feeder : 1 sheet at a time |
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Paper Stacker Capacity |
Face down : |
100 sheets, |
Face up : |
1 sheet |
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Paper Limitations |
-Adhesive label sheets specifically designed for laser printers |
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-Transparencies specifically designed for laser printers |
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-Envelopes with peel-off adhesive strips or more than one fold-over flap |
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to seal must have adhesive compatible with the heat and pressure of the |
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printer’s fusing process. |
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Unacceptable Papers |
-Paper with embossed lettering, perforations, or rough texture |
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-Paper with which color was added after the paper was made |
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-Paper forms whose ink is not for laser printing |
2-4 |
Samsung Electronics |
3. Disassembly and Reassembly
3-1 Removal Procedures
Cautions:
•Be sure to unplug the power cord whenever you are working on the printer with one of the covers removed.
•Be sure to remove the toner cartridge before you repair parts.
Releasing Plastic Latches
Many of the parts are held in places with plastic latches. The latches break easily; release them carefully. To remove such parts, press the hook end of the latch away from the part to which it is latched.
3-2 Face-Up Cover and Front Cover
1.Place your fingers on both sides of the face-up cover, push the cover, and pull it down.
2.Bend the cover slightly to release the tabs at the end, then remove the cover.
Samsung Electronics |
3-1 |
Disassembly and Reassembly
3. Open the front cover with hand.
4.Remove a screw securing the front cover to the main frame.
5.Unlatch the front cover, then remove the front cover.
3-2 |
Samsung Electronics |
Disassembly and Reassembly
3-3 Panel Board and Board Cover
1.Before you remove these parts, you should remove:
-Face up cover and Front cover (see page 3-1)
2.From the front cover, remove two screws, then remove the board cover.
Panel board
Board cover
3-4 Transfer Roller
1. Open the front cover with hand.
3.To remove the transfer roller, pull up the tab to release the roller, then take it out.
2. Remove the transfer roller cap.
Cap
Samsung Electronics |
3-3 |
Disassembly and Reassembly
3-5 Top Cover and Rear Cover
1.Before you remove these covers, you should remove:
-Face up cover and Front cover (see page 3-1)
2.Remove three screws.
3.Unlatch the tabs on the left and right side end of the cover, then take out the rear cover.
4. Remove two screws, and remove the top cover.
Unlatch the tabs at both sides to remove the cover.
3-6 Side Covers (Left, Right)
1.Before you remove these side covers, you should remove:
-Face up cover and Front cover (see page 3-1) -Top cover and Rear cover (see page 3-4)
2.Remove two screws on the back of the covers.
3.Unlatch the left and right side covers, and remove them.
3-4 |
Samsung Electronics |
Disassembly and Reassembly
3-7 SMPS/Engine Control Board
1.Before you remove the board, you should remove:
-All covers (see pages 3-1, 3-4)
2.Turn the printer upside down.
3.Remove three screws securing the shield, then remove the shield.
4.Unplug all the connectors from the SMPS, then take out the SMPS and the engine board.
SMPS and
Engine board
Shield
3-8 Control Board
1. Before you remove the control board, you should remove:
-All covers (see pages 3-1, 3-4)
2. Unplug all the connectors from the control board, |
Control Board |
remove three screws, and take out the control |
|
board. |
|
Samsung Electronics |
3-5 |
Disassembly and Reassembly
3-9 Joint Board
1.Before you remove the joint board, you should remove:
-All covers (see pages 3-1, 3-4) -SMPS (see page 3-5)
2.Unplug all connectors from the joint board, remove three screws, then remove the joint board.
3-10 Sensor Board
1.Before you remove the sensor board, you should remove:
-All covers (see pages 3-1, 3-4) -SMPS (see page 3-5)
2.Remove two screws, unplug all connectors from the sensor board, then remove the board.
3-6 |
Samsung Electronics |
Disassembly and Reassembly
3-11 Gear Bracket
1. Before you remove the gear bracket, you should remove:
-All covers (see pages 3-1, 3-4)
2. Remove six screws securing the gear bracket, unplug the connector from the motor, then remove the gear bracket.
3-12 Motor
1. Before you remove the motor, you should |
Motor |
remove: |
|
-All covers (see pages 3-1, 3-4) |
|
-Gear bracket (see page 3-14) |
|
2. Remove three screws, then remove the motor.
Gear bracket
Samsung Electronics |
3-7 |
Disassembly and Reassembly
3-13 HVPS Board
1.Before you remove the HVPS board, you should remove:
-All covers (see pages 3-1, 3-4)
3.Unplug the connector from the HVPS board, then remove the board.
2. Remove five screws from the HVPS board.
High voltage electrodes
HVPS board
Note: When you reassemble the HVPS board, make sure that the high voltage electrodes are placed correctly.
3-14 LSU
1. Before you remove the LSU, you should remove: -All covers (see pages 3-1, 3-4)
2. Unplug two connectors, remove five screws, then take out the LSU.
LSU
3-8 |
Samsung Electronics |
Disassembly and Reassembly
3-15 Fuser
1.Before you remove the fuser, you should remove: -All covers (see pages 3-1, 3-4)
2.Remove one screw securing the wire cap at the left side of the frame, unlatch the cap, then remove the cap.
4. Unlatch the tabs using a proper tool.
Wire cap
Unlatch these tabs. |
5. Slide the fuser in the direction of arrow and take |
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|
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it out. |
3. Remove four screws.
Samsung Electronics |
3-9 |
Disassembly and Reassembly
3-16 Upper Frame
1.Before you remove the upper frame, you should remove:
-All covers (see pages 3-1, 3-4) -Gear bracket (see page 3-14) -HVPS board (see page 3-16)
2.Remove six screws, then remove two screws securing the solenoid.
3. Unlatch the front end of the frame, then lift it up.
Solenoid
3-17 Pressure Roller
1.Before you remove the roller, you should remove:
-All covers (see pages 3-1, 3-4)
-All boards (see pages 3-3, 3-5, 3-6, 3-8) -Upper frame (see page 3-10)
-Fuser (see page 3-9)
2. Remove the roller.
3-10 |
Samsung Electronics |
Disassembly and Reassembly
3-18 Pickup Roller
1.Before you remove the pickup roller, you should remove:
-All covers (see pages 3-1, 3-4)
-All boards (see pages 3-3, 3-5, 3-6, 3-8) -Upper frame (see page 3-9)
2.Remove one screw, pull the pick-up bushing slightly toward you, then rotate it clock-wise.
3.Remove the E-ring at the right end of the roller.
4.Remove a pin passing through a shaft to take out the pick-up roller, then push the roller shaft to the right. Lift the left side of the roller, then take it out.
3-19 Installing SIMM
1.Before you install SIMM, make sure that printer power is off, all cables are unpluged. The toner cartridge is also to be removed.
2.Turn the printer upside down, and remove all screws securing the shield cover, then remove the shield cover.
Samsung Electronics |
3-11 |
Disassembly and Reassembly
3. Locate the SIMM connector on the control board.
4.Hold the SIMM with the connection points and insert the SIMM all the way into the connector at 30o angle .
5. Push it firmly until it snaps into place.
Make sure both metal clips on the connector are fastened and the two pins on the connector are pushed through the holes on the SIMM.
Note: When you disassemble the SIMM, push out on the metal clips at each end of the connector and pull it toward you.
6. Reassemble the shield cover.
3-12 |
Samsung Electronics |
4. Troubleshooting
4-1 Abnormal Image Printing and Defective Roller
If abnormal image prints periodically, check the parts shown below.
No |
Roller |
Abnormal image period |
Kind of abnormal image |
|
|
|
|
1 |
OPC Drum |
94.3mm |
White spot |
2 |
Charge Roller |
37.7mm |
Black spot |
3 |
Supply Roller |
40.0mm |
Horizontal density band |
4 |
Develop Roller |
46.1mm |
Horizontal density band |
5 |
Transfer Roller |
47.1mm |
Black side contamination/transfer fault |
6 |
Heat Roller |
56.1mm |
Black spot and fuser ghost |
7 |
Pressure Roller |
56.2mm |
Black side contamination |
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|
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4-2 Print Quality
4-2-1 No Image
No image? |
NO |
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YES |
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Self test |
NO |
pattern prints? |
|
YES
Check connection to computer or replace controller.
Self testing |
NO |
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is possible via |
|
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DCU? |
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YES |
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Take out the cartridge and prepare the tester for electronic connection.
Is the OPC
terminal of machine NO well-connected
to Frame?
YES
A on next page
Re-test after replacing the conector or controller board.
Repair or replace the GND terminal.
Does the |
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Check the path between |
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video data line to |
NO |
video controller, engine board |
||
LSU transit to High/Low |
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and HVPS. Repair or replace |
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when printing? |
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the defective component |
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YES |
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or board. |
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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.
Samsung Electronics |
4-1 |
Troubleshooting
A |
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NO |
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Transfer |
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voltage OK? (on the |
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transfer roller |
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shaft) |
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YES |
Are the |
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NO |
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connection terminal |
Repair or replace terminal. |
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and connection |
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correct? |
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YES |
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Replace HVPS or repair defective component.
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Developing |
NO |
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NO |
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(-300V) and supplying |
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Is the connection |
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Repair or replace terminal. |
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(-500V) voltage |
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terminal OK? |
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are |
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OK? |
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YES |
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YES |
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Replace HVPS or repair |
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defective component. |
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Sealing tape |
NO |
is removed from the |
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cartridge? |
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YES |
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Does the
counter indicate over NO the toner's guarranty
life?
YES
Remove the tape.
Transfer roller might be out of its location. -> Locate the roller into its place.
This could occurrs when the power of LSU is low or the density is low due to the obstacles on the window -> Replace LSU or clean the window.
Replace the toner cartridge.
4-2 |
Samsung Electronics |
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Troubleshooting |
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4-2-2 All Black |
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Does the |
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All black in |
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Check the path among video |
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NO |
video data line to LSU |
NO |
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controller, engine board, |
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printing area? |
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transit to High/ Low when |
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HVPS, LSU for the shortage |
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printing? |
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or open. -> Repair or replace |
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YES |
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YES |
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the boards. |
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Replace LSU. |
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Is transfer |
NO |
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voltage supplied |
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Repair or replace HVPS. |
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from HVPS? |
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YES |
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Is the |
NO |
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Replace LSU. |
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Hsync/ signal received |
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in LSU? |
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YES |
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Transfer part's contact is bad. -> Repair or replace toner cartridge.
Samsung Electronics |
4-3 |
Troubleshooting
4-2-3 Vertical White Line (Band)
|
|
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Check if the |
|
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The ribs in fuser or toner on the |
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roller may invoke the image |
||
White line |
NO |
printout is still has the |
NO |
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problem. -> Replace the fuser |
||
missing definitely? |
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same problem even right after |
|
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cover or the defective part. |
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passed through the |
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transfer roller. |
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The image is originally black or the |
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YES |
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black part is far close to the top. |
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YES |
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-> Use the pattern which has the |
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image below bigger than 10mm |
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from the top. |
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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.
Toner material might be stuck to blade in the developer inside and it prevents toner supply -> Replace the developer.
Check both if the toner cartridge's counter is over its guaranty and amount of the toner material.
-> Replace the toner cartridge.
4-4 |
Samsung Electronics |
4-2-4 Dark Image
NO |
'Dark' selected |
|
|
via RCP? |
|
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YES |
|
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Change to |
|
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'Normal' and test. |
|
|
Same at 'Normal'? |
NO |
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YES |
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Works |
NO |
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correctly with |
|
|
-300V of Bias |
|
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voltage? |
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YES |
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Works |
NO |
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correctly after |
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replaced LSU? |
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YES |
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The power of LSU is set high or internal problem. -> Replace LSU or adjust volume.
Troubleshooting
END
Repair or replace the defective component.
Toner over supply due to the adjustment fault of metering blade in developer.
-> Replace developer.
Samsung Electronics |
4-5 |
Troubleshooting
4-2-5 Background
Recommended |
NO |
|
Print 20 to 30 pages using |
paper used? |
|
|
the recommended paper. |
|
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YES
- Adjust voltage or |
|
NO |
Transfer, |
YES |
Same |
problem |
|
|
NO |
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|
|||
replace HVPS. |
|
charge and developing |
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END |
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|||||||||
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||||||||||
- Repair or replace |
|
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voltage are OK? |
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occurs? |
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after checking the |
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terminals' contacts. |
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YES |
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Operating/ |
NO |
Dirt or |
NO |
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||||||
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storage atmosphere is |
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dust around the |
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Replace the |
|||||||
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too high temperature |
|
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charge roller? |
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toner cartridge. |
|||||
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/humidity? |
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YES |
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YES |
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Solve the problem under the recommended condition (10-32 degree Centigrade).
Clean the charge roller
or replace step-up device /terminal after check.
Check terminals or contacts and 'Guide-Deve Spring' |
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are misplaced. |
NO |
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-> Repair or replace transfer roller etc. |
|
Work OK? |
|
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|
Check if the LED of PTL in front of the transfer roller
is on when it presses the top cover switch on purpose. YES -> If not, replace PTL.
Internal blade or suppying part of the developer is defective. -> Replace the toner cartridge.
4-6 |
Samsung Electronics |
4-2-6 Ghost
Replace PTL assembly.
Check HVPS contacts and HVPS's selfoutput.
-> If failed, repair/replace HVPS.
Troubleshooting
Is it regular |
|
NO |
Is it regular |
|
NO |
Is it regular |
|
interval of 47mm? |
|||||||
interval of 94mm? |
|
interval of 46mm? |
|
||||
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(as transfer roller |
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interval) |
YES |
YES |
NO |
PTL lamp |
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works OK? |
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YES |
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Developing |
||
NO |
Transfer |
/suppying voltage |
|||
normal? (-300V/ |
|||||
voltage is set to |
|||||
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|||||
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|||||
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-500V) |
||||
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standard? |
||||
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YES |
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YES |
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Irregularity of NIP |
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between rollers in |
||
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developer. |
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-> Replace developer. |
||
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YES
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.
NO
-Repair or replace HVPS .
-Check and repair or replace the terminal contacts.
Bias voltage |
NO |
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is OK? (-300V) |
|
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YES |
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Operating/storage NO temperature is too low or
not recommended paper used?
YES
Use the machine with recommended paper and at normal condition.
Adjust the Bias
voltage or replace
HVPS.
There may be a problem in toner layer control in toner cartridge.
-> Replace the developer.
Samsung Electronics |
4-7 |
Troubleshooting
4-2-7 Black Dot
Is it regular |
NO |
When taking |
NO |
Bad image |
|||||
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out the cartridge, |
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removes by |
|||
interval of 38mm? |
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||||||
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toner leaks? |
|
scratching? |
|||
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YES |
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YES |
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YES |
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NO |
The problem |
|||
randomly occured |
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due to the toner |
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fallen. -> Clean the |
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machine. |
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The problem occured since the obstacles stuck to charge roller. -> Replace developer and C/R.
Toner leaks and toner material dropped onto the paper. -> Replace the developer.
Check toner is stuck onto the P/R or H/R in fuser. -> Clean it or replace.
4-2-8 Horizontal Band
NO
Black band?
YES
The black |
NO |
||
band has regular |
|||
|
|||
interval? |
|
||
|
YES |
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||
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|
NO
94mm interval?
YES
The OPC is damaged due to the irregular transfer voltage of HVPS.
-> Repair/replace HVPS.
-> If the same problem persists, replace the developer.
Black band |
NO |
||
is far about 10mm |
from |
||
|
|||
white band? |
|
Problem of internal contacts in OPC.
-> Replace developer.
This occurs when no Hsync/ at LSU.
-> Replace LSU.
The OPC is damaged under the direct sunlight for around 5 minutes. -> If the same problem persists in 10 hours, replace the developer.
Does it appear |
|
|
Problems of terminal contact, |
||
NO |
|
transfer voltage supplying, |
|||
at every 56.1mm |
at |
|
|
and transfer roller's due to the |
|
specific place? |
|
|
charge roller is ruined (38mm). |
||
|
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-> Repair/replace HVPS, |
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||
|
YES |
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developer. |
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||
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Heat roller is ruined. -> Replace the roller.
4-8 |
Samsung Electronics |