Samsung ML-651x series User manual

Service Manual
Mono Laser Printer
ML-551x/651x Series
1. Speed
• ML-551x series : 55 ppm in Letter
• ML-651x series : 65 ppm in Letter
2. Printing Resolution
• Max. 1200x1200 dpi effective output
3. Processor
• SPGPV4 700 Mhz
4. Printer Language Emulations
• PCL, PS3
5. Memory
• 256 MB default
• 256 MB / 512 MB (Optional Memory)
6. Interfaces
• One USB port, Two USB Host Port
• 1 GB Ethernet
• One IEEE 802.11 b,g,n wireless LAN (Optional)
7. Various optional units
• Finisher, Mailbox, SCF, HCF, HDD etc.
The keynote of Product

ⓒ
Samsung Electronics Co.,Ltd. April. 2010
Printed in Korea.
VERSION NO. : 1.00 CODE : 5510-00000E
GSPN (Global Service Partner Network)
North America : service.samsungportal.com
Latin America : latin.samsungportal.com
CIS : cis.samsungportal.com
Europe : europe.samsungportal.com
China : china.samsungportal.com
Asia : asia.samsungportal.com
Mideast & Africa : mea.samsungportal.com

1.1 Safety Warning …………………………………………………… 1-1
1.2 Caution for safety ………………………………………………… 1-2
1.2.1 Toxic material ………………………………………………… 1-2
1.2.2 Electric Shock and Fire Safety Precautions ……………… 1-2
1.2.3 Handling Precautions ……………………………………… 1-3
1.2.4 Assembly / Disassembly Precautions……………………… 1-3
1.2.5 Disregarding this warning may cause bodily injury ……… 1-4
1.3 ESD Precautions ………………………………………………… 1-5
2.1 Specifications …………………………………………………… 2-1
2.1.1 Product Overview …………………………………………… 2-1
2.1.2 Specifications………………………………………………… 2-2
2.1.3 Model Comparion Table …………………………………… 2-12
2.2 Product Description ……………………………………………… 2-13
2.2.1 Product Configuration ……………………………………… 2-13
2.2.2 Front View …………………………………………………… 2-14
2.2.3 Rear View …………………………………………………… 2-15
2.2.4 Paper Path…………………………………………………… 2-16
2.2.5 System Layout ……………………………………………… 2-18
2.2.6 Hardware Configuration …………………………………… 2-25
2.2.7 Finisher ……………………………………………………… 2-39
2.2.8 Mail Box ……………………………………………………… 2-43
3.1 General precautions on disassembly ………………………… 3-1
3.2 Screws used in the printer ……………………………………… 3-2
chapter 1 Precautions
chapter 2 Product specifications and descriptions
Contents
chapter 3 Replacement procedure

3.3 Replacing the maintenance parts ……………………………… 3-4
3.3.1 Fuser unit …………………………………………………… 3-4
3.3.2 Pick up/Retard/Forward roller ……………………………… 3-5
3.3.3 Transfer roller………………………………………………… 3-6
3.4 Replacing the main svc part …………………………………… 3-7
3.4.1 Cover ………………………………………………………… 3-7
3.4.2 Video controller ……………………………………………… 3-11
3.4.3 Engine controller …………………………………………… 3-11
3.4.4 Main drive unit ……………………………………………… 3-12
3.4.5 Feed drive unit ……………………………………………… 3-13
3.4.6 Fuser drive unit ……………………………………………… 3-14
3.4.7 Duplex drive unit …………………………………………… 3-16
3.4.8 Lift motor……………………………………………………… 3-16
3.4.9 Fuser Release drive unit …………………………………… 3-17
3.4.10 Fuser drive board unit …………………………………… 3-18
3.4.11 LSU Fan …………………………………………………… 3-19
3.4.12 LSU ………………………………………………………… 3-19
3.4.13 Exit unit …………………………………………………… 3-20
3.4.14 Frame terminal …………………………………………… 3-22
3.4.15 WTB pipe unit ……………………………………………… 3-22
3.4.16 SMPS/ HVPS board ……………………………………… 3-23
3.4.17 Frame shaft ………………………………………………… 3-25
3.4.18 Regi. unit …………………………………………………… 3-26
3.4.19 Regi. actuator ……………………………………………… 3-27
3.4.20 Eraser lamp ………………………………………………… 3-27
3.4.21 External temperature sensor……………………………… 3-28
3.5 Finisher …………………………………………………………… 3-29
3.5.1 Cover ………………………………………………………… 3-29
3.5.2 Stapler Assy ………………………………………………… 3-30
3.5.3 Safety Sensor ……………………………………………… 3-33
3.5.4 Temper Assy ………………………………………………… 3-31
3.5.5 Finisher Main Board ………………………………………… 3-33
3.5.6 Diverter Assy ………………………………………………… 3-33
3.5.7 Exit Motor …………………………………………………… 3-34
Contents

3.3.8 Stacker Motor ……………………………………………… 3-35
3.6 Mail Box …………………………………………………………… 3-36
4.1 Alignment and Adjustments……………………………………… 4-1
4.1.1 Control Panel………………………………………………… 4-1
4.1.2 Understanding The Status LED …………………………… 4-2
4.1.3 JAM Removal ……………………………………………… 4-3
4.1.4 Useful menu item for service ……………………………… 4-14
4.1.5 Periodic Defective Image ………………………………… 4-15
4.1.6 Using the smart panel program …………………………… 4-16
4.1.7 Updating Firmware ………………………………………… 4-18
4.1.8 Tech Mode …………………………………………………… 4-21
4.2 Troubleshooting…………………………………………………… 4-33
4.2.1 Procedure of Checking the Symptoms …………………… 4-33
4.2.2 Error Message and Troubleshooting ……………………… 4-36
4.2.3 Image Quality problem……………………………………… 4-134
4.2.4 Other errors ………………………………………………… 4-148
4.2.5 Network problems and solutions…………………………… 4-150
5.1 Block Diagram …………………………………………………… 5-1
5.2 Connection Diagram……………………………………………… 5-2
6.1 Tool for Troubleshooting ………………………………………… 6-1
6.2 Acronyms and Abbreviations …………………………………… 6-2
6.2.1 Acronyms …………………………………………………… 6-2
chapter 4 Alignment and Troubleshooting
Contents
chapter 6 Reference Information
chapter 5 System Diagram

Contents
6.2.2 Service Parts ………………………………………………… 6-4
6.3 A4 ISO 19798 Standard Pattern………………………………… 6-8
6.3.1 A4 ISO 19752 Standard Pattern…………………………… 6-8
6.4 Selecting a location ……………………………………………… 6-9
attached Exploded Views & Parts List

1. Precautions
1-1 Samsung Electronics
Service Manual
ML-551x / 651x series
In order to prevent accidents and to prevent damage to the equipment please read the precautions listed
below carefully before servicing the printer and follow them closely.
1.1 Safety Warning
(1) Only to be serviced by appropriately qualified service engineers.
High voltages and lasers inside this product are dangerous. This printer should only be serviced by a
suitably trained and qualified service engineer.
(2) Use only Samsung replacement parts
There are no user serviceable parts inside the printer. Do not make any unauthorized changes or
additions to the printer, these could cause the printer to malfunction and create electric shock or fire haz-
ards.
(3) Laser Safety Statement
The printer is certified in the U.S. to conform to the requirements of DHHS 21 CFR, chapter 1 Subchapter
J for Class I(1) laser products, and elsewhere is certified as a Class I laser product conforming to the
requirements of IEC 60825-1:1993 + A1:1997 + A2:2001. Class I laser products are not considered to
be hazardous. The laser system and printer are designed so there is never any human access to laser
radiation above a Class I level during normal operation, user maintenance or prescribed service condition.
• Wavelength: 800 nm
• Beam divergence
- Paraller: 12 degrees
- Perpendicular: 35 degrees
• Maximum power or energy output: 15 mW (ML-651x series) / 10 mW (ML-551x series)
WARNING
Never operate or service the printer with the protective cover removed from Laser/Scanner assembly. The
reflected beam, although invisible, can damage your eyes. When using this product, these basic safety
precautions should always be followed to reduce risk of fire, electric shock, and injury to persons:
1. Precautions

1. Precautions
Service Manual
ML-551x / 651x series
1-2 Samsung Electronics
1.2 Caution for safety
1.2.1 Toxic material
This product contains toxic materials that could cause illness if ingested.
(1) If the LCD control panel is damaged it is possible for the liquid inside to leak. This liquid is toxic. Contact
with the skin should be avoided, wash any splashes from eyes or skin immediately and contact your
doctor. If the liquid gets into the mouth or is swallowed see a doctor immediately.
(2) Please keep Drum cartridge and Toner Cartridge away from children. The toner powder contained in the
Drum cartridge and Toner Cartridge may be harmful and if swallowed you should contact a doctor.
1.2.2 Electric Shock and Fire Safety Precautions
Failure to follow the following instructions could cause electric shock or potentially cause a fire.
(1) Use only the correct voltage, failure to do so could damage the printer and potentially cause a fire or
electric shock.
(2) Use only the power cable supplied with the printer. Use of an incorrectly specified cable could cause the
cable to overheat and potentially cause a fire.
(3) Do not overload the power socket, this could lead to overheating of the cables inside the wall and could
lead to a fire.
(4) Do not allow water or other liquids to spill into the printer, this can cause electric shock. Do not allow
paper clips, pins or other foreign objects to fall into the printer these could cause a short circuit leading to
an electric shock or fire hazard.
(5) Never touch the plugs on either end of the power cable with wet hands, this can cause electric shock.
When servicing the printer remove the power plug from the wall socket.
(6) Use caution when inserting or removing the power connector. The power connector must be inserted
completely otherwise a poor contact could cause overheating possibly leading to a fire. When removing
the power connector grip it firmly and pull.
(7) Take care of the power cable. Do not allow it to become twisted, bent sharply round corners or other
wise damaged. Do not place objects on top of the power cable. If the power cable is damaged it could
overheat and cause a fire or exposed cables could cause an electric shock. Replace a damaged power
cable immediately, do not reuse or repair the damaged cable. Some chemicals can attack the coating on
the power cable, weakening the cover or exposing cables causing fire and shock risks.
(8) Ensure that the power sockets and plugs are not cracked or broken in any way. Any such defects should
be repaired immediately. Take care not to cut or damage the power cable or plugs when moving the
machine.
(9) Use caution during thunder or lightening storms. Samsung recommend that this machine be disconnected
from the power source when such weather conditions are expected. Do not touch the machine or the
power cord if it is still connected to the wall socket in these weather conditions.
(10) Avoid damp or dusty areas, install the printer in a clean well ventilated location. Do not position the
machine near a humidifier. Damp and dust build up inside the machine can lead to overheating and
cause a fire.
(11) Do not position the printer in direct sunlight. This will cause the temperature inside the printer to rise
possibly leading to the printer failing to work properly and in extreme conditions could lead to a fire.
(12) Do not insert any metal objects into the machine through the ventilator fan or other part of the casing, it
could make contact with a high voltage conductor inside the machine and cause an electric shock.

1. Precautions
1-3 Samsung Electronics
Service Manual
ML-551x / 651x series
1.2.3 Handling Precautions
The following instructions are for your own personal safety, to avoid injury and so as not to damage the
printer
(1) Ensure the printer is installed on a level surface, capable of supporting its weight. Failure to do so could
cause the printer to tip or fall.
(2) The printer contains many rollers, gears and fans. Take great care to ensure that you do not catch your
fingers, hair or clothing in any of these rotating devices.
(3) Do not place any small metal objects, containers of water, chemicals or other liquids close to the printer
which if spilled could get into the machine and cause damage or a shock or fire hazard.
(4) Do not install the machine in areas with high dust or moisture levels, beside on open window or close to a
humidifier or heater. Damage could be caused to the printer in such areas.
(5) Do not place candles, burning cigarettes, etc on the printer, These could cause a fire.
1.2.4 Assembly / Disassembly Precautions
Replace parts carefully, always use Samsung parts. Take care to note the exact location of parts and also
cable routing before dismantling any part of the machine. Ensure all parts and cables are replaced correctly.
Please carry out the following procedures before dismantling the printer or replacing any parts.
(1) Check the contents of the machine memory and make a note of any user settings. These will be erased if
the mainboard or network card is replaced.
(2) Ensure that power is disconnected before servicing or replacing any electrical parts.
(3) Disconnect printer interface cables and power cables.
(4) Only use approved spare parts. Ensure that part number, product name, any voltage, current or
temperature rating are correct.
(5) When removing or re-fitting any parts do not use excessive force, especially when fitting screws into
plastic.
(6) Take care not to drop any small parts into the machine.
(7) Handling of the OPC Drum
- The OPC Drum can be irreparably damaged if it exposed to light.
Take care not to expose the OPC Drum either to direct sunlight or to fluorescent or incandescent
room lighting. Exposure for as little as 5 mins can damage the surface? photoconductive properties
and will result in print quality degradation. Take extra care when servicing the printer. Remove the
OPC Drum and store it in a black bag or other lightproof container. Take care when working with the
covers(especially the top cover) open as light is admitted to the OPC area and can damage the OPC
Drum.
- Take care not to scratch the green surface of OPC Drum Unit.
If the green surface of the Drum Cartridge is scratched or touched the print quality will be compromised.

1. Precautions
Service Manual
ML-551x / 651x series
1-4 Samsung Electronics
1.2.5 Disregarding this warning may cause bodily injury
(1) Be careful with the high temperature part.
The fuser unit works at a high temperature. Use caution when working on the printer. Wait for the fuser to
cool down before disassembly.
(2) Do not put finger or hair into the rotating parts.
When operating a printer, do not put hand or hair into the rotating parts (Paper feeding entrance, motor,
fan, etc.). If do, you can get harm.
(3) When you move the printer.
This printer weighs approx. 30 kg (66.58 lbs) including toner cartridge and cassette. Use safe lifting and
handling techniques. Use the lifting handles located on each side of the machine. Back injury could be
caused if you do not lift carefully.
(4) Ensure the printer is installed safely.
The printer weighs approx. 30 kg (66.58 lbs), ensure the printer is installed on a level surface, capable of
supporting its weight. Failure to do so could cause the printer to tip or fall possibly causing personal injury
or damaging the printer.
(5) Do not install the printer on a sloping or unstable surface. After installation, double check that the printer
is stable.

1. Precautions
1-5 Samsung Electronics
Service Manual
ML-551x / 651x series
1.3 ESD Precautions
Certain semiconductor devices can be easily damaged by static electricity. Such components are commonly
called “Electrostatically Sensitive (ES) Devices” or ESDs. Examples of typical ESDs are: integrated circuits,
some field effect transistors, and semiconductor “chip” components.
The techniques outlined below should be followed to help reduce the incidence of component damage
caused by static electricity.
Caution >>Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.
1. Immediately before handling a semiconductor component or semiconductor-equipped assembly, drain
off any electrostatic charge on your body by touching a known earth ground.Alternatively, employ a
commercially available wrist strap device, which should be removed for your personal safety reasons prior
to applying power to the unit under test.
2. After removing an electrical assembly equipped with ESDs, place the assembly on a conductive surface,
such as aluminum or copper foil, or conductive foam, to prevent electrostatic charge buildup in the vicinity
of the assembly.
3. Use only a grounded tip soldering iron to solder or desolder ESDs.
4. Use only an “anti-static” solder removal device. Some solder removal devices not classified as “anti-static”
can generate electrical charges sufficient to damage ESDs.
5. Do not use Freon-propelled chemicals. When sprayed, these can generate electrical charges sufficient to
damage ESDs.
6. Do not remove a replacement ESD from its protective packaging until immediately before installing it. Most
replacement ESDs are packaged with all leads shorted together by conductive foam, aluminum foil, or a
comparable conductive material.
7. Immediately before removing the protective shorting 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. Maintain continuous electrical contact between the ESD and the assembly into which it will be installed,
until completely plugged or soldered into the circuit.
9. Minimize bodily motions when handling unpackaged replacement ESDs. Normal motions, such as
the brushing together of clothing fabric and lifting one’s foot from a carpeted floor, can generate static
electricity sufficient to damage an ESD.

2. Product specifications and descriptions
Service Manual
ML-551x / 651x series
2-1 Samsung Electronics
2.1 Specifications
2.1.1 Product Overview
2. Product specifications and descriptions
1. Speed
• ML-551x series : 55 ppm in Letter
• ML-651x series : 65 ppm in Letter
2. Printing Resolution
• Max. 1200x1200 dpi effective output
3. Processor
• SPGPV4 700 Mhz
4. Printer Language Emulations
• PCL, PS3
5. Memory
• 256 MB default
• 512 MB Optional Memory
6. Interfaces
• One USB port, Two USB Host Port
• 1 GB Ethernet
• One IEEE 802.11 b,g,n wireless LAN (Optional)
7. Various optional units
• Finisher, Mailbox, SCF, HCF, HDD etc.
ML-5510/6510 series (Wave type)
ML-5512/6512 series (Flat type)

2. Product specifications and descriptions
Service Manual
ML-551x / 651x series
2-2 Samsung Electronics
2.1.2 Specifications
• Product Specifications are subject to change without notice. See below for product specifications.
2.1.2.1 General Specifications
Items ML-551x series ML-651x series
General Size (W*D*H) without
optional 464 x 540 x 420mm (18.27 x 21.26 x 16.54inches) 464 x 540 x 420mm (18.27 x 21.26 x 16.54inches)
Weight with consumables - ML-551xN : 33.8 Kg (74.52 lbs)
- ML-551xND : 34.4 Kg (75.84 lbs) 34.4 Kg (75.84 lbs)
I/O Interface USB2.0 , USB HOST2.0,
NW(10/100/1G), IEEE 802.11b/g/n USB2.0 , USB HOST2.0, NW(10/100/1G), IEEE 802.11b/g/n
Noise Level Printing/Copying 56 dBA 58 dBA
Ready 30 dBA 30 dBA
Warming Up 53 dBA 53 dBA
Temperature Operation 15 to 32 °C (59 to 89.6 °F) 15 to 32 °C (59 to 89.6 °F)
Storage (Packed) -20 to 40 °C (-4 to 104 °F) -20 to 40 °C (-4 to 104 °F)
Humidity Operation 20 to 80% RH 20 to 80% RH
Storage (Packed) 10 to 90% RH 10 to 90% RH
Power rating 110 volt models AC 110~127 V AC 110~127 V
220 volt models AC 220~240V AC 220~240V
Power
consumption Average operating mode Less than 820 W Less than 900 W
Ready mode Less than 100 W Less than 120 W
Power save mode Less than 10 W Less than 10 W
Power off mode Less than 1 W Less than 1 W
Machine Life Printing Volume
(SETAMPV) 7,000 sheets / month 10,000 sheets / month
Max. Monthly Duty 275,000 sheets 275,000 sheets
Machine Life 5 years, 1,000K Pages
(Whichever comes first.) 5 years, 1,000K Pages (Whichever comes first.)
Device Memory 256MB 256MB
Internal N/W 1 Gigabit Ethernet 1 Gigabit Ethernet

2. Product specifications and descriptions
Service Manual
ML-551x / 651x series
2-3 Samsung Electronics
2.1.2.2 Print Specifications
Items ML-551x series ML-651x series
Print Speed 55 ppm (Letter) / 52 ppm (A4) 65 ppm (Letter) / 62 ppm (A4)
Print Language PCL / PS3 PCL / PS3
Power Save Yes Yes
Resolution Optical 600 x 600 dpi 600 x 600 dpi
Enhanced 1200 x 1200 dpi 1200 x 1200 dpi
Toner Save Yes Yes
Memory - Default : 256MB
- Max : 768MB - Default : 256MB - Max : 768MB
FPOT From ready 8 sec 8 sec
From sleep(30min) 35 sec 35 sec
Duplex Print Optional Yes
Printable Area 208 x 273 mm (Letter) 208 x 273 mm (Letter)
Halftone(Gray Scale) 256 levels 256 levels
2.1.2.3 Paper Handling Specifications
Items ML-551x series ML-651x series
Main Tray Capacity - Plain Paper: 520 sheets @ 20lb (80g/㎡)
- envelopes: 50 sheets - Plain Paper: 520 sheets @ 20lb (80g/㎡) - envelopes: 50 sheets
Media sizes Letter, Legal, Oficio, Folio,A4, JIS B5,
ISO B5, Executive, A5, Statement,
A6, Envelope Monarch, Envelope C6,
Envelope No9, Envelope COM-10,
Envelope DL, Envelope C5, Custom(98.6 x
148.5 ~ 216 x 356)
Letter, Legal, Oficio, Folio, A4, JIS B5,
ISO B5, Executive, A5, Statement,
A6, Envelope Monarch, Envelope C6,
Envelope No9, Envelope COM-10,
Envelope DL, Envelope C5, Custom(98.6 x
148.5 ~ 216 x 356)
Media types Plain Paper, Thin Paper, Bond, Punched,
Pre-Printed, Recycled, Envelope,
Transparency, Label, Card Stock, Letter
head, Thick, Cotton, Colored,Archive,
Thicker
Plain Paper, Thin Paper, Bond, Punched,
Pre-Printed, Recycled, Envelope,
Transparency, Label, Card Stock, Letter
head, Thick, Cotton, Colored,Archive,
Thicker

2. Product specifications and descriptions
Service Manual
ML-551x / 651x series
2-4 Samsung Electronics
Items ML-551x series ML-651x series
Main Tray
(Continue..) Media weight - Supported Weight: 60 ~ 163 gsm - Plain Paper: 60~90 g/㎡
- Thin Paper: 60~70 g/㎡
- Bond: 105~120 g/㎡
- Punched: 60~90 g/㎡
- Pre-Printed: 75~90 g/㎡
- Recycled: 60~90 g/㎡
- Envelope: 75~90 g/㎡
- Transparency: 138~146 g/㎡
- Label: 120~150 g/㎡
- Letterhead: 90 g/㎡cotton paper
- Supported Weight: 60 ~ 163 gsm
- Plain Paper: 60~90 g/㎡
- Thin Paper: 60~70 g/㎡
- Bond: 105~120 g/㎡
- Punched: 60~90 g/㎡
- Pre-Printed: 75~90 g/㎡
- Recycled: 60~90 g/㎡
- Envelope: 75~90 g/㎡
- Transparency: 138~146 g/㎡
- Label: 120~150 g/㎡
- Letterhead: 90 g/㎡cotton paper
sensing - H/W Install Detect: Yes
- Paper Empty: Yes
- Paper Type Detect: No
- Paper Size Detect: Yes
- H/W Install Detect: Yes
- Paper Empty: Yes
- Paper Type Detect: No
- Paper Size Detect: Yes
Bypass tray Capacity - Plain paper :100 sheets @ 20lb (80g/㎡)
- Transparency :20 sheets
- Envelopes :10 sheets
- Labels :10 sheets
- Thick (163 gsm ~216 gsm ) : 10 sheets
- Transparency : 20 sheets
- Plain paper :100 sheets @ 20lb (80g/㎡)
- Transparency :20 sheets
- Envelopes :10 sheets
- Labels :10 sheets
- Thick (163 gsm ~216 gsm ) : 10 sheets
- Transparency : 20 sheets
Media sizes - 76.2 x 127 mm (3 x 5) ~ 216 x 356 mm
(8.5 x 14) - 76.2 x 127 mm (3 x 5) ~ 216 x 356 mm (8.5 x 14)
Media type Printer Default, Plain Paper, Thick Paper,
Thin Paper, Bond Paper, Color Paper,
CardStock, Labels, Transparency,
Envelope, Preprinted, Cotton, Recycled
Paper, Archive, Thicker, HolePunched,
LetterHead, Cotton, Colored
Printer Default, Plain Paper, Thick Paper,
Thin Paper, Bond Paper, Color Paper,
CardStock, Labels, Transparency,
Envelope, Preprinted, Cotton, Recycled
Paper, Archive, Thicker, HolePunched,
LetterHead, Cotton, Colored
Media weight 16~58 lb (60 to 216 g/㎡) 16~58 lb (60 to 216 g/㎡)
Sensing Paper empty sensor Paper empty sensor
Optional
Cassette tray
(Second
Cassette)
* Only Tray2
Capacity Plain Paper: 520 sheets @ 20lb (80g/㎡)
- envelopes: 50 sheets (Only first option
cassette)
Plain Paper: 520 sheets @ 20lb (80g/㎡)
- envelopes: 50 sheets (Only first option
cassette)
Media sizes Letter, Legal, Oficio, Folio, A4, JIS B5,
ISO B5, Envelope Com10, Envelope No9,
Envelope DL, Envelope C5, Executive,
A5, Statement, Custom(98.6 x 148.5 ~
216 x 356)
Letter, Legal, Oficio, Folio, A4, JIS B5,
ISO B5, Envelope Com10, Envelope No9,
Envelope DL, Envelope C5, Executive,
A5, Statement, Custom(98.6 x 148.5 ~
216 x 356)
Media types Plain Paper, Thin Paper, Bond, Punched,
Pre-Printed, Recycled, Transparency,
Label, Card Stock, Letterhead, Thick,
Cotton, Colored, Archive, Extra Thick
Plain Paper, Thin Paper, Bond, Punched,
Pre-Printed, Recycled, Transparency,
Label, Card Stock, Letterhead, Thick,
Cotton, Colored, Archive, Extra Thick

2. Product specifications and descriptions
Service Manual
ML-551x / 651x series
2-5 Samsung Electronics
Items ML-551x series ML-651x series
Optional
Cassette tray
(Second
Cassette)
* Only Tray2
Media weight - Supported Weight : 60 ~ 163 gsm
- Plain Paper : 60~90 g/㎡
- Thin Paper : 60~70 g/㎡
- Bond : 105~120g/㎡
- Punched: 60~90 g/㎡
- Pre-Printed : 75~90 g/㎡
- Envelope : 75~90 g/㎡
- Recycled: 60~90 g/㎡
- Transparency : 138~146g/㎡
- Label : 120~150g/㎡
- Letterhead : 90g/㎡cotton paper
- Supported Weight : 60 ~ 163 gsm
- Plain Paper : 60~90 g/㎡
- Thin Paper : 60~70 g/㎡
- Bond : 105~120g/㎡
- Punched: 60~90 g/㎡
- Pre-Printed : 75~90 g/㎡
- Envelope : 75~90 g/㎡
- Recycled: 60~90 g/㎡
- Transparency : 138~146g/㎡
- Label : 120~150g/㎡
- Letterhead : 90g/㎡cotton paper
Sensing - H/W Install Detect: Yes
- Paper Empty: Yes
- Paper Type Detect: No
- Paper Size Detect: Yes
- H/W Install Detect: Yes
- Paper Empty: Yes
- Paper Type Detect: No
- Paper Size Detect: Yes
High- capacity
Feeder
(Optional)
Capacity 2,000 sheets @ 20lb (80g/㎡) 2,000 sheets @ 20lb (80g/㎡)
Media sizes A4, Letter Legal, Folio A4, Letter Legal, Folio
Media types Plain, Thin , Thick Plain, Thin , Thick
Media weight Plain Paper : 60 ~ 90 g/㎡(16~24 lb)
Thin Paper : 60 ~ 70 g/㎡
Thick paper : 90 ~ 120 g/㎡
Plain Paper : 60 ~ 90 g/㎡(16~24 lb)
Thin Paper : 60 ~ 70 g/㎡
Thick paper : 90 ~ 120 g/㎡
Sensing Paper Level Detect: Yes - Empty
Paper Size Detect: Yes Paper Level Detect: Yes - Empty Paper Size Detect: Yes
Out put
Stacking(Main
set)
Face Down 500 sheets @ 20lb (80g/㎡) 500 sheets @ 20lb (80g/㎡)
4bin mail box Face Down 400 sheets @ 20lb (80g/㎡) (100sheet
4-bin) 400 sheets @ 20lb (80g/㎡) (100sheet 4-bin)
Offset catch
tray Capcity 500 sheets @ 20lb (80g/㎡) 50 sheet
stapler, 20 Set Max. 500 sheets @ 20lb (80g/㎡) 50 sheet stapler, 20 Set Max.
Automatic
duplex Supporting Optional YES
Throughput Over 60% in simplex Over 60% in simplex
Media sizes A4,Letter,Legal, folio, Oficio A4,Letter,Legal, folio, Oficio
Media types Plain Paper Plain Paper
Media weight 75~120 gsm (20 lb ~ 32 lb)
Supported paper: (~120gsm) 75~120 gsm (20 lb ~ 32 lb) Supported paper: (~120gsm)

2. Product specifications and descriptions
Service Manual
ML-551x / 651x series
2-6 Samsung Electronics
2.1.2.4 Software and Interface Specifications
Items ML-551x series ML-651x series
Driver
Supporing OS WINDOW 2000/XP(32/64bit)/2003(32/64bit)/ Vista(32/64bit)/2008(32/64bit)/7 2000/XP(32/64bit)/2003(32/64bit)/ Vista(32/64bit)/2008(32/64bit)/7
LINUX - RedHat 8 ~ 9(32bit)/Enterprise Linux
WS 4, 5(32/64bit)
- Fedora Core 1 ~ 7 (32/64bit)
- SuSE 8.2 ~ 10.2/Enterprise Desktop
9~10 (32/64bit)
- Madrake 9.2 ~ 10.1 (32/64bit)
- Ubuntu 6.06 ~ 7.04
- Debian 3.1 ~ 4.0
- RedHat 8 ~ 9(32bit)/Enterprise Linux
WS 4, 5(32/64bit)
- Fedora Core 1 ~ 7 (32/64bit)
- SuSE 8.2 ~ 10.2/Enterprise Desktop
9~10 (32/64bit)
- Madrake 9.2 ~ 10.1 (32/64bit)
- Ubuntu 6.06 ~ 7.04
- Debian 3.1 ~ 4.0
MAC - Mac OS X 10.3~10.6 - Mac OS X 10.3~10.6
UNIX Sun Solaris 8,9,10(SPARC/x86)
IBM AIX 5.x (6.1)
HP-UX 11i (PA-RISC/IA-64)
Sun Solaris 8,9,10(SPARC/x86)
IBM AIX 5.x (6.1)
HP-UX 11i (PA-RISC/IA-64)
Default Driver
PCL6 (For Windows), PS (for Mac, Linux) PCL6 (For Windows), PS (for Mac, Linux)
Drvier Feature [Windows]
- Watermark, Overlay, N-up printing,
Poster printing
- Duplex, Quality
[Windows]
- Watermark, Overlay, N-up printing,
Poster printing
- Duplex, Quality
[Mac/Linux]
- N-up printing, Duplex, Quality [Mac/Linux] - N-up printing, Duplex, Quality
WHQL 2000/XP(32/64bit)/2003(32/64bit)/
Vista(32/64bit)/2008(32/64bit) 2000/XP(32/64bit)/2003(32/64bit)/ Vista(32/64bit)/2008(32/64bit)
Application Smart Panel Install Default (Supporting OS is same
with driver.) Install Default (Supporting OS is same with driver.)
Network
Management - Set IP, SWAS 5.0 & SWS 2.0, CounThru 3.0
- SWAS Plug-In
- Job Accounting, Driver Management
Plug-in, Device Map Plug-in
- Set IP, SWAS 5.0 & SWS 2.0,
CounThru 3.0
- SWAS Plug-In
- Job Accounting, Driver Management
Plug-in, Device Map Plug-in
HDD File
Management S/W TBD TBD
AnyWeb Print YES YES
USB TYPE A Hi-Speed USB 2.0 Host 2 Port
- Rear 1 Port
- Front1 Port
Hi-Speed USB 2.0 Host 2 Port
- Rear 1 Port
- Front1 Port
USB HOST ON Front (1) Host on Front (1) Host on Front
USB ON BACK (1) slave (1) host (1) slave (1) host
Wired LAN 1GB Ethernet 1GB Ethernet
Wireless LAN Wireless (802.11 b/g/n) => Optional Wireless (802.11 b/g/n) => Optional
Foreign Device Interface No No

2. Product specifications and descriptions
Service Manual
ML-551x / 651x series
2-7 Samsung Electronics
2.1.2.5 Network Specifications
Items ML-551x series ML-651x series
Network
Interface NETWORK OS [Windows] - Microsoft Windows
2000/XP(32/64bits)/2003(32/64bits)/
Vista(32/64bits)/2008(32/64bit)/7
[Mac]
- Mac OS 10.3~10.6
[Linux]
- RedHat 8 ~ 9(32bit)/Enterprise Linux
WS 4, 5(32/64bit)
- Fedora Core 1 ~ 7 (32/64bit)
- SuSE 8.2 ~ 10.2/Enterprise Desktop
9~10 (32/64bit)
- Madrake 9.2 ~ 10.1 (32/64bit)
- Mandriva 2005 ~ 2007
- Ubuntu 6.06 ~ 7.04
- Debian 3.1 ~ 4.0
[Novell]
- Netware 5.x, 6.x(TCP/IP Only)
[Others]
- Unix
- Sun Solaris 8,9,10(SPARC/x86)
IBM AIX 5.x (6.1)
- IBM Linux (System P)
HP-UX 11i (PA-RISC/IA-64)
(11.11/11.20/11.22/11.23/11.31)
[Windows]
- Microsoft Windows
2000/XP(32/64bits)/2003(32/64bits)/
Vista(32/64bits)/2008(32/64bit)/7
[Mac]
- Mac OS 10.3~10.6
[Linux]
- RedHat 8 ~ 9(32bit)/Enterprise Linux
WS 4, 5(32/64bit)
- Fedora Core 1 ~ 7 (32/64bit)
- SuSE 8.2 ~ 10.2/Enterprise Desktop
9~10 (32/64bit)
- Madrake 9.2 ~ 10.1 (32/64bit)
- Mandriva 2005 ~ 2007
- Ubuntu 6.06 ~ 7.04
- Debian 3.1 ~ 4.0
[Novell]
- Netware 5.x, 6.x(TCP/IP Only)
[Others]
- Unix
- Sun Solaris 8,9,10(SPARC/x86)
IBM AIX 5.x (6.1)
- IBM Linux (System P)
HP-UX 11i (PA-RISC/IA-64)
(11.11/11.20/11.22/11.23/11.31)
Network
Protocols TCP/IP TCP/IPv4/IPv6, HTTP, SNMPv1/v2c/ v3, SMTP, IPSec, DNS/WINS, DDNS,
DHCP, SSL/TLS, BOOTP, AutoIP
TCP/IPv4/IPv6, HTTP, SNMPv1/v2c/
v3, SMTP, IPSec, DNS/WINS, DDNS,
DHCP, SSL/TLS, BOOTP, AutoIP
IPA/SPX N/A N/A
Ether Talk N/A N/A
IP addressing Static IP Yes Yes
Auto IP Yes Yes
BOOTP Yes Yes
DHCP Yes Yes

2. Product specifications and descriptions
Service Manual
ML-551x / 651x series
2-8 Samsung Electronics
Items ML-551x series ML-651x series
SNMP/MIB
Access MIB-2 (RFC 1213) Yes Yes
Host Resource
MIB (RFC 2790) Yes Yes
Printer MIB
(RFC 3805) Yes Yes
Finisher MIB
(RFC 3806) No No
Samsung Private
MIB Yes Yes
HP Compatibility Yes Yes
SNMP Trap Yes Yes
Printing Protocols Window Printing
(SMB) No No
LPR/LPD Yes Yes
IPP Yes Yes
Netware I-Print Yes Yes
Netware NDPS Yes Yes
Ether Talk Yes Yes
Port 9100 Yes Yes
Others Yes Yes
Device Discovery DNS Yes Yes
Dynamic DNS Yes Yes
Multicast DNS
(Bonjoure) Yes Yes
WSD Yes Yes
SLP Yes Yes
uPNP (SSDP) Yes Yes

2. Product specifications and descriptions
Service Manual
ML-551x / 651x series
2-9 Samsung Electronics
2.1.2.6 Consumables
Items ML-551x series ML-651x series
Toner Cartridge Yield - Standard: Average Cartridge Yield
10K standard pages.
- High Yield:Average cartridge Yield
30K standard pages.
* Declared cartridge yield in accordance
with ISO/IEC 19752.
- Standard: Average Cartridge Yield
10K standard pages.
- High Yield:Average cartridge Yield
30K standard pages.
* Declared cartridge yield in accordance
with ISO/IEC 19752.
Key Unique, Electronic key(S-chip2) Unique, Electronic key(S-chip2)
Life detect Dot count & T/C Sensor Dot count & T/C Sensor
Imaging Unit Yield Approx. 80,000 pages Approx. 80,000 pages
Key S-chip2 S-chip2
Sensor page count + OPC Revolution page count + OPC Revolution
NOTE - When replacing the toner cartridge, you must replace the waste toner container too. The new toner
cartridge kit includse a waste toner container.
2.1.2.7 Maintenance Parts
Items ML-551x series ML-651x series
Fuser unit Yield Approx. 150,000 pages @ 3-pages
printing job, NN condition Approx. 150,000 pages @ 3-pages printing job, NN condition
Part Code JC91-01014A (110V)
JC91-01014B (220V) JC91-01014A (110V) JC91-01014B (220V)
Pick-Up roller Yield Approx. 200,000 pages Approx. 200,000 pages
Part Code JC97-02259A JC97-02259A
Forward roller Yield Approx. 200,000 pages Approx. 200,000 pages
Part Code JC97-02259A JC97-02259A
Retard roller Yield Approx. 100,000 pages Approx. 100,000 pages
Part Code JC97-02259A JC97-02259A
Transfer roller Yield Approx. 100,000 pages Approx. 100,000 pages
Part Code JC66-02729A JC66-02729A