Samsung ML-3050, ML-3051N Service Manual
LASER PRINTER
ML-3050 Series
ML-3051N/XAA
Basic Model :ML-3050
Manual
SERVICE
LASER PRINTER The keynote of Product
- Speed: Up to 28ppm (Ltr. 30ppm),
1200x1200dpi Effective output
- Paper Path: MPF Type Cassette
- Emulation: PCL6, PS3
- CPU: SPGPv3
- Memory: 16~64MB Standard
- Cassette: 250 sheet Cassette
- MP: 50 sheet MP
- Lan: 10/100 Base TX (ML-3051N, ML-3051ND)
- I/O: USB 2.0, IEEE1284
- Toner: 8K Toner (4K initial)
- Option: 802.1 1b/g Wireless N/W,
250 sheet Opt. SCF
- Duplex: Built in Duplex
(ML-3051ND)
* This service manual is a property of Samsung Electronics Co., Ltd.
Any unauthorized use of Manual can be punished under applicable
international and/or domestic law.
* This service manual is also provided on the web, the ITSELF
system Samsung Electronics Co., Ltd.
http://itself.sec.samsung.co.kr
Samsung Electronics Co.,Ltd. February. 2006
Printed in Korea.
VERSION NO. : 1.01 CODE : JC-0161C
Contents
1. Precautions
1.1 Safety Warning 1-1
1.2 Safety Caution
1-2
1.3 ESD Precautions
1-4
2. Product Specification
2.1 Product Overview 2-1
2.2 Specifications
2-2
3. System Overview
3.1 System Construction 3-1
3.2 Mechanical Parts Specifications
3-6
3.3 Engine H/W Specifications
3-15
3.4 S/W Descriptions
3-31
4. Alignment and Adjustments
4.1 Sample Pattern 4-1
4.2 Control Panel
4-2
4.3 Consumables and Replacement Parts
4-7
4.4 LED Status Error Message
4-7
4.5 Abnormal Image Printing and Defective Roller
4-10
4.6 How to use DCU
4-1 1
4.7 Paper Path
4-16
4.8 Download & Reset F/W
4-28
5. Disassembly and Reassembly
5.1 General Precautions on Disassembly 5-1
5.2 Disassembly and Reassembly
5-2
6. Troubleshooting
6.1 6-1
6.2 The cause and solution of the bad discharge
6-8
6.3 The cause and solution of the malfunction
6-13
6.4 T oner Cartridge Service
6-19
6.5 The cause and solutions of bad environment of the software
6-27
7. Exploded Views & Parts List
7.1 Main 7-2
7.2 Cover Ass'y
7-4
7.3 Front Cover Ass'y
7-6
7.4 Rear Cover Ass'y
7-8
7.5 OPE Cover Ass'y
7-9
7.6 Frame
7-10
7.7 MP Ass'y
7-14
7.8 Main Drive Ass'y
7-16
7.9 Fuser Drive Ass'y
7-18
7.10 Duplex Unit (Optional)
7-19
7.1 1 Fuser Unit
7-21
7.12 Cassette Unit
7-23
8. Block diagram
8.1 System Block Diagram 8-1
8.2 System Timing Chart
8-2
Continued
9. Connection Diagram
9.1 Connection Diagram 9-1
10. Schematic Diagram
10.1 Main Board 10-1
10.2 OPE LCD
10-14
10.3 OPE LED
10-15
10.4 SMPS 1 10V
10-16
SMPS 220V
10-17
10.5 HVPS
10-18
1 1. Reference Information
1 1.1 T roubleshooting Tools 11-1
1 1.2 Acronyms and Abbreviations
11-2
1 1.3 Selecting printer locations
11-4
1 1.4 Sample Tests Patterns
11-5
12. Series model solution(ML-3050 and SCX-5530FN)
Continued
Precautions
Samsung Electronics
Service Manual
1-1
1
1
1. Precautions
The cautions below are items needed to keep in mind when maintaining and servicing.
Please read carefully and keep the contents in mind to prevent accidents while servicing and to prevent the
machine from getting damaged.
1.1 Safety Warning
(1) Request service by qualified service person.
Service for this machine must be performed by a Qualified service person. It is dangerous if unqualified service personnel or users try to fix the machine.
(2) Do not rebuild.
Do not attach or change parts discretionary. Do not dissemble, fix of rebuilt it. If so, printer will abnormally
work and electric shock or fire may occur.
(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 1(1) laser products, and elsewhere, is certified as a Class I laser product conforming to the
requirements of IEC 825.
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.
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.
Samsung Electronics
Service Manual
Precautions
1-2
1.2 Safety Caution
1.2.1 Noxious Material Precaution
The toner in a printer cartridge contains a chemical material, which may harm human body if it is swallowed.
Please keep children out of reach of the toner cartridge.
1.2.2 Electric Shock or fire Precaution
It is possible to get electric shock or burn by fire if you don't fallow the instructions of the manual.
(1) Use exact voltage. Please use an exact voltage and wall socket. If not, a fire or an electric leakage can be
caused.
(2) Use authorized power cord. Do use the power cord supplied with PRINTER. A fire can happen when over cur-
rent flows in the power cord.
(3) Do not insert many cords in an outlet. A fire can be occurred due to flow over current in an outlet.
(4) Do not put water or extraneous matter in the PRINTER. Please do not put water, other liquid, pin, clip, etc. It
can cause a fire, electric shock, or malfunction. If this occurs, turn off the power and remove the power plug
from outlet immediately.
(5) Do not touch the power plug with wet hand. When servicing, remove the power plug from outlet. Do not insert
or take off it with wet hand. Electric shock can be occurr.
(6) Caution when inserting or taking off the power plug. The power plug has to be inserted completely. If not, a fire
can be caused due to poor contact. When taking off the power plug, grip the plug and take it off. If grip the line
and pull over, it could be damaged. A fire or electric shock could happen.
(7) Management of power cord. Do not bend, twist, or bind it and place other materials on it. Do not fix with sta-
ples. If the power cord gets damaged, a fire or electric shock can happen. A damaged power cord must be
replaced immediately. Do not repair the damaged part and reuse it. A repaired part with plastic tape can be
cause a fire or electric shock. Do not spread chemicals on the power cord. Do not spread insecticide on the
power cord. A fire or electric shock can be happen due to thinner(weak) cover of the power cord.
(8) Check whether the power outlet and the power plug are damaged, pressed, chopped, or blazing fire or not.
When such inferiorities are found, repair it immediately. Do not make it pressed or chopped when moving the
machine.
(9) Caution when there is thundering or lightning, and being flash of lightening. It causes a fire or electric shock.
Take the power plug off there is thunder. Do not touch cable and device when thundering and flash of lighten-
ing.
(10) Avoid the place where is moisture or has dust. Do not install the printer where lots of dust or around humidifi-
er. Afire can occurred. A plug part need to clean well with dried fabric to remove dust. If water drops are
dripped on the place covered with dust, a fire can occurred.
(1 1) A void direct sunlight. Do not install the printer near window where direct contacts to the sunlight. If the
machine contacts sunlight long time, the machine cannot work properly because inner temperature of the
machine is getting hotter. Afire can occur.
(12) Turn off the power and take off the plug when smoke, strange smell, or sound from the machine. If you keep
using it, a fire can be occurred.
(13) Do not insert steel or metal piece inside/outside of the machine. Do not put steel or metal piece into a ventila-
tor. An electric shock could happened.
Precautions
Samsung Electronics
Service Manual
1-3
1.2.3 Handling Precautions
If you ignore this information, you could harm machine and could be damaged.
(1) Do not install it on different levels, or slanted floor.
Please confirm whether it is balanced or not after installation. If it is unbalanced, an accident can be hap-
pened due to the machine falling over.
(2) Be careful not to insert a finger or hair in the rotating unit.
Be careful not to insert a finger of hair in the rotating unit (motor, fan, paper feeding part, etc) while the
machine is operating. Once it happens, you could be harmed.
(3) Do not place a pot containing water/chemical or small metals. If they got caught into the inner side of
machine, a fire or electric shock can be occurred.
(4) Do not install it where lots of moisture or dust exists or where raindrop reaches. A fire or electric shock
can be caused.
(5) Do not place a candlelight, burning cigarette, and etc. on the machine. Do not install it near to heater. A
fire can be occurred.
1.2.4 Assembly/Disassembly precaution
When replacing parts, do it very carefully. Memorize the location of each cable before replace parts for reconnecting it afterwards. Do memorize. Please perform the steps below before replace or disassembly the parts.
(1) Check the contents stored in the memory. All the information will be erased after replacing main board.
The information needed to keep has to be written down.
(2) Before servicing or replacing electric parts, take off a plug.
(3) Take off printer cables and power cord connected to printer.
(4) Do use formal parts and same standardized goods when replacing parts.Must check the product name,
part cord, rated voltage, rated current, operating temperature, etc.
(5) Do not give an over-force when release or tighten up the plastic parts.
(6) Be careful not to drop the small parts such as screws in the printer.
(7) Be careful not to change the location of small parts such as screws when assembling and disassembling.
(8) Do remove dust or foreign matters completely to prevent fire of tracking, short, or etc.
(9) After finished repair, check the assembling state whether it is same as before the repair or not.
Samsung Electronics
Service Manual
Precautions
1-4
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 dam-
age 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.
Product Specifications
Samsung Electronics
Service Manual
2-1
2
2
2.2 Specifications
Product Specifications are subject to change without notice. See below for product specifications.
2.2.1 General Print Engine
ML-3050 SERIES ML-3050 ML-3051N ML-3051ND
Engine Speed Simplex Up to 28 ppm in A4 (30 ppm in Letter)
Duplex N/A Up to 19 ipm in A4 (21
ipm in Letter)
Warmup time From Sleep Less than 20 sec, Cold warm-Up time : 35ec
FPOT From Ready Less than 8.5 sec
From Idle Less than 28.5 sec
From Coldboot Less than 43.5 sec
Resolution - Up to 1,200 x 1,200 dpi effective output
2. Product Specifications
2.1 Product Overview
Up to 28ppm (Ltr. 30ppm)
- 250 sheet Cassette
- 50 sheet MP
- 250 sheet Opt. SCF
USB 2.0, IEEE1284
8K Toner (4K Standard)
PCL6, PS3, 1200x1200dpi
400 MHz, 16~64MB Standard
ML-3051ND
- 10/100 Base TX
- Opt. 802.11b/g Wireless N/W
Built in Duplex (ML-3051ND)
Samsung Electronics
Service Manual
Product Specifications
2-2
2.2.2 Controller & S/W
ML-3050 SERIES ML-3050 ML-3051N ML-3051ND
Processor Samsung 400 MHz
Memory Std. 16 MB 64 MB
Max. 272 MB 320 MB
Printer Languages - PCL6, SPL, PostScript3, PCL6, SPL, IBM ProPrinter, EPSON
IBM ProPrinter, EPSON
Fonts - 45 scalable, 1 bitmap 45 scalable, 1 bitmap, 136 PostScript3 fonts
Driver Default Driver SPL
Supporting OS Windows 95/98/Me/NT 4.0/2000/XP/2003
Various Linux OS including Red Hat, Caldera, Debian, Mandrake, Slackware,
SuSE and Turbo Linux
Mac OS 10.3 Mac OS 8.6~9.2/10.1~10.3
WHQL Windows XP/2000/2003
Compatibility PCL6: Win95/98/NT4.0/2000/Me/XP/2003
PS3: Win9x/NT4.0/2000/Me/XP/2003 PPD,
Mac PPD, Linux PPD
KS/KSSM: DOS
Wired Network Protocol External : SPX/IPX, TCP/IP, SNMP, HTTP 1.1
Supporting OS Microsoft Windows 98/ME/2000/XP/2003
Microsoft Windows NT 4.xMac OS 8.6 and
aboverVarious Linux OS including Red Hat,
Caldera, Debian, Mandrake, Slackware, SuSE
and Turbo LinuxNovell 4.x,5.x,6.x
Wireless Network Protocol External : SPX/IPX, TCP/IP, SNMP, HTTP 1.1
Supporting OS Microsoft Windows 98/ME/2000/XP/2003
Microsoft Windows NT 4.xMac OS 8.6 and
aboverVarious Linux OS including Red Hat,
Caldera, Debian, Mandrake, Slackware, SuSE
and Turbo LinuxNovell 4.x,5.x,6.x
Application RCP N/A
Status Monitor N/A
Smart Panel YES (RCP,SM)
Network Management External : SAS (Samsung SAS (Samsung Admin Service), SetIP
Admin Service), SetIP
PCL6: Win95/98/NT4.0/
2000/Me/XP/2003
SPL: Linux, Mac
PS3: N/A (Factory Option)
KS/KSSM: DOS
External : Microsoft
Windows 98/ME/2000/
XP/2003Microsoft
Windows NT 4.xMac OS
10.3Various Linux OS
including Red Hat,
Caldera, Debian,
Mandrake, Slackware,
SuSE and Turbo
LinuxNovell 4.x,5.x,6.x
External : Microsoft
Windows 98/ME/2000/
XP/2003Microsoft
Windows NT 4.xMac OS
10.3Various Linux OS
including Red Hat,
Caldera, Debian,
Mandrake, Slackware,
SuSE and Turbo
LinuxNovell 4.x,5.x,6.x
Product Specifications
Samsung Electronics
Service Manual
2-3
ML-3050 SERIES ML-3050 ML-3051N ML-3051ND
Interface
Parallel - IEEE 1284
USB - USB 2.0
Wired Network - Optional (External) Ethernet 10/100 Base TX (Internal)
Wireless Network - Optional (External) Optional Optional (Internal) 802.11b/g
(Internal) Wireless LAN (Internal)
User Interface
LCD - N/A 2 x 16 Character without backlit
LED - 3 LED (Status, Toner Save, N-Up)
Key - 3 Key: Stop, Toner Save, 8 Key: Stop, Toner Save, N-Up
N-Up < , OK, >, Menu, Back
Samsung Electronics
Service Manual
Product Specifications
2-4
2.2.3 Paper Handling
ML-3050 SERIES ML-3050 ML-3051N ML-3051ND
Standard Capacity - 250-sheet Cassette Tray, 50-sheet Multi Purpose Tray @ 75g/
Max. Capacity - 550 sheets @ 75g/
Printing Max. Size 216 x 356 mm (8.5" x 14")
Min. Size 76 x 127 mm (3.0" x 5.0")
Multi-purpose tray
Capacity - 50 sheets @ 75g/
Media sizes - A4, A5, A6, Letter, Legal, Folio, Oficio, Executive,ISO B5, JIS B5,
3"x5",Monarch, No.10, DL, C5, C6
Media type - Plain Paper, Transparency, Envelope, Labels, Post Card, Card stock
Media weight - 16~43lb (60 to 163g/ )
Sensing - Paper empty sensor
Standard Cassette Tray
Capacity - 250 sheets @ 75g/
Media sizes - A4, A5, Letter, Legal, Executive, Folio, Oficio, ISO B5, JIS B5
Media types - Plain paper
Media weight - 16~24lb (60 to90g/ )
Sensing - Paper empty sensor
Optional Cassette Tray
Capacity - 250 sheets @ 75g/
Media sizes - A4, A5, Letter, Legal, Executive, Folio, Oficio, ISO B5, JIS B5
Media types - Plain paper
Media weight - 16~24lb (60 to90g/ )
Sensing - Paper empty sensor
Output Stacking
Capacity Face-Down 150 sheets @ 75g/
Face-Up 1 sheet @ 75g/
Output Full sensing - N/A
Duplex
Supporting - N/A Built-in
Media sizes - N/A A4, Letter, Legal, Folio,
Oficio
Media types - N/A Plain Paper
Media weight - N/A 20~24lb (75 to 90g/ )
Product Specifications
Samsung Electronics
Service Manual
2-5
2.2.4 Consumables
ML-3050 SERIES ML-3050 ML-3051N ML-3051ND
Toner Black 4,000 pages @ ISO 19752 standard Coverage(Standard 4,000 pages,
High Yield 8,000 pages)
Key Electronic key(CRUM) Only
Life detect Toner gauge sensor by dot count
Drum Yield 12,000 sheets
2.2.5 Reliability & Service
ML-3050 SERIES ML-3050 ML-3051N ML-3051ND
Printing Volume - 9,200 sheets / year 767 sheets / month 38 sheets / day
(SET AMPV)
5.2 Max. Monthly Duty - 100,000 sheets
5.3 MPBF - 100,000 sheets
5.4 MTTR - 30 min.
5.5 SET Life Cycle - 250,000 sheets or 5 years (whichever comes first)
5.6 RDS Comm. Mode N/A Yes
Operation N/A Yes
2.2.6 Environment
ML-3050 SERIES ML-3050 ML-3051N ML-3051ND
Acoustic Noise Level Printing Less than 54.0 dBA
(Sound Power/Pressure)
Standby Less than 39.0 dBA
Sleep Back Ground Level
Power Consumption Ready Less than 150W
AVG. Less than 400W
Max/Peak Less than 900W
Sleep/Power Off Less than 11W / Less than 0.4W
Dimension(W x D x H) SET 390 x 436 x 265 mm (15.2 x17.2 x 10.5 ) Weight SET 10 kg 10.5 kg
Gross 14 kg 14.5kg
Samsung Electronics
Service Manual
Product Specifications
2-6
2.2.7 Options
ML-3050 SERIES ML-3050 ML-3051N ML-3051ND
*Memory - 16 MB, 32 MB, 64 MB, 128 MB, 256MB
Second Cassette - 250-sheet Cassette Tray
Wired Network - Ethernet 10/100 Base TX Default
(External) - ML-00ND
Wireless Network - 802.11b Wireless LAN 802 . 1 1 b / g W i r e l e s s L A N ( I n t e r n a l )
(External) - ML-00LA
Hard Disk - N/A
Duplex Unit - N/A Default
2.2.8 Others
ML-3050 SERIES ML-3050 ML-3051N ML-3051ND
Memory Upgradable Mem. Slot 1 EA
Upgradable Mem. Type 100 Pin SDRAM DIMM
Upgradable Mem. Unit 16MB, 32MB, 64MB, 128MB, 256MB
Sensor Paper Empty YES
Paper Size NO
Media Type NO
Paper Full NO
Service Service Item & Period 1. Transfer Roller : 70K pages
2. Fuser Unit : 80K pages
3. Pick-up Roller : 150K pages
* Memory : The ML-3050 has 32MB of memory which can be expanded to 288MB, The ML-3051N or ML-3051ND has 64MB of
memory which can be expanded to 320MB.
Item Description Model Code Size
Memory DIMM Exlends your Printers ML-00MA 16MB
memory capacity. ML-00MB 32MB
ML-00MC 64MB
ML-00MD 128MB
ML-MEM140 256MB
Product Specifications
Samsung Electronics
Service Manual
2-7
2.3 Model Comparison Table
Image
Engine SEC SEC SEC SEC
Speed(ppm) 24ppm 28ppm 33ppm 33ppm
Processor 266MHz 400MHz 400MHz 400MHz
Resolution 1,200X1,200 dpi 1,200X1,200 dpi 1,200X1,200 dpi 1,200X1,200 dpi
FPOT 12 sec 8.5 sec 8.5 sec 10 sec
Emulation PS3, PCL6 PCL6 PS3, PCL6 PS3, PCL6
Ram(Std.) 32MB(Max. 160MB) 16MB(Max. 272MB) 64MB(Max. 320MB) 32MB(Max. 288MB)
Interface IEEE1284, USB 2.0 IEEE1284, USB 2.0 IEEE1284, USB 2.0 IEEE1284, USB 2.0
Duplex Yes Factory Option Factory Option Option
Paper Input 550 Cassette, 100 MP 250 Cassette, 50 MP 250 Cassette, 50 MP 500 Cassette, 100 MP
(Capa./Type) 250 SCF Opt. 250 SCF Opt. 500 SCF Option
Os Compatibility
Win 95/98/NT/2000/ Win 95/98/NT/2000/ Win 95/98/NT/2000/ Win 95/98/NT/2000/
Me/XP, Mac Me/XP, Linux Me/XP, Linux Me/XP, Linux
Toner 10K 4K/8K 4K/8K 6K/12 K
SEC SEC SEC SAMSUNG
ML-2550 ML-3050 ML-2570 ML-3560
SSORY
em
C
y
-
ACCE
INA-ACCESSORY
CBF-POWER CORD
CBF-POWER CORD
CBF-POWER CORD
BAG PE
CBF INTERFACE-USB
S/W APPLICATION-CD
MANUAL-(CARD)WARRANTY CARD
LABEL(P)-BLANK 90*25
It
ode
JC99-01950K
3903-000085
3903-000146
3903-000190
6902-000288
JC39-00001A
JC46-00276A
JC68-00690A
JC68-01584A
Quantit
System Overview
Samsung Electronics
Service Manual
3-1
3
3
3. System Overview
3.1 System Construction
3.1.1 SUMMARY
ML-305X is consisted of the Engine parts and F/W, and said engine parts is consisted of the mechanical parts comprising
Frame, Feeding, Developing, Driving, Transferring, Fusing, Cabinet and H/W comprising the main control board, power
board, operation panel, PC Interface.
In ML-305X, the main controller is consisted of Asic(SPGPv3) parts, Memory parts, Engine Interface parts and it
functions as Bus Control, I/O Handling, drivers & PC Interface by CPU.
Memory Access supports 16bit Operation, and Program Memory 32MB and Working Memory as well.
In ML-305X, the paper path is consisted of 250 sheets Cassette containing friction Pad, pickup-roller,
feed-roller for functioning as registration, Earth-transfer for guiding the transfer inlet, Guide-Tr for guiding sheets
between transferring and fixing, Fuser, Exit Assy.
In ML-305X, the driving device is consisted of f55 BLDC motor, OPC, Pick-up, Feed, Gear-Train connected with
Mounting member. - to be changed
3.1.2 System Layout
Roller-Heat
Roller-Exit
Roller-Transfer
Roller-Pickup
Roller-Feed
Roller-MP
Roller-Pressure
Roller-REGI
OPC
Duplex
Duplex
Roller-REGI
OPC
Samsung Electronics
Service Manual
System Overview
3-2
3.1.2.1 Feeding Section
Feeding Method : Universal Cassette Type
Feeding Standard : Center Loading
Feeding Capacity : Cassette 250 Sheets (75g/ , 20lb StandardPaper)
3.1.2.2 Transfer Ass’y
In Warranty( Life time) : Within 70,000 sheets printing
System Overview
Samsung Electronics
Service Manual
3-3
3.1.2.3 Driver Ass’y
MAIN Motor ass’y is for Cassette,MPF and Toner Cartridge
EXIT Motor ass’y is for fuser,exit roller and the initial duplexing feeding
DUPLEX Motor assembly is for duplexing feeder on the ML-3051ND only
3.1.2.4 Fuser Ass’y
Fusing Type : E-Coil type
Heat Roller : [ 28.3 with 0.1 Crown ]
Pressure Roller : [electrically conductive]
Thermistor - Temperature Detecting Sensor
Thermostat - Overheat Protection Device
Drive Ass’y
Duplex Drive Ass'y
Connection
PCB
Duplex Motor
Samsung Electronics
Service Manual
System Overview
3-4
3.1.2.6 T oner Cartridge
OPC Cleaning :Mechanical Cleaning by the cleaning blade.
The recycled toner : Trash room for the recycled toner
No shutter for protecting the OPC Drum
3.1.2.5 LSU
LSU is consist of LD(Laser Diode) and polygon motor control. When the controller generate the printing signal LD will
turn on and Polygon motor starts.If the receiving part in LSU detect the beam and then Hsync is generated. When the
rotation of poygon motor is steady, it is time of LSU ready status for printing. If either of two condition is not satisfied,
LSU error is expected.
Trouble Failure Analysis
Polygon Motor Error No steady rotation of Polygon Motor
Hsync Error In spite of steady rotation of Polygon Motor,
There is no generation of the Hsync signal
Cleaning Roller
Cleaning Blade
-650V
0.16mW
200V-1.25KV
V
DC
= -460V
V
PP
= 1520V, f = 2.5KHz, Duty(-) = 32%
1
2
3
4
5
6
7
8
+4.2kV
-50V
+
-
System Overview
Samsung Electronics
Service Manual
3-5
3.1.2.7 Duplex Unit
Duplex printing function as factory option
Available Paper : Letter, Legal, Folio, Oficio and A4
3.1.2.8 Optional Tray ( SCF)
For customer covenience in managing paper
Capacity : 250 sheets
Samsung Electronics
Service Manual
System Overview
3-6
3.2 Mechanical Parts Specifications
3.2.1 Frame
Material : PC + ABS V0 NH-1000T(Cheil Industries)
Weight : 1.0kg
3.2.2 Feeding Part
Feeding Type : Universal Cassette Type
Feeding Standard : Center Loading
Feeding Qty : Cassette 250 sheets (75g/ , 20Ib paper standard)
MPF 500 sheets (75g/ , 20Ib paper standard)
Special Media 5 sheets in MPF (OHP, Envelope, Label, Post Card, Index Paper etc.)
Separating Type : Cassette-Friction Pad Type
MPF-Friction Pad Type
Driver Type : Driving by Gearing from Main Motor
Pick Up Roller Driver : Solenoid
Pick Up Roller Rubber Material : EPDM + IR = 1.6 or more
Pick Up Velocity : 143.12 203.21mm/sec (Process : 124.95 179.7mm/sec)
Paper detecting Sensor : Photo Sensor
Paper Size Sensor : None
Paper Separating Pad Material : NBB 52 = 0.8~1.2
Separating Pad Pressure : 190gf
Pick Up Roller RPM 97.623 140.6RPM
Feeding Pressure (Cassette) : 250 gf 10% (SPRING H mm, based on 1 sheet)
320 gf 10% (SPRING H mm, based on 250 sheet)
Paper Exit Type : Facd Down
Feed Roller Velocity : Feed-roller Cassette : 127.56 183.79mm/sec
Feed-roller Frame : 126.07 181.64mm/sec
Feed Roller Driver : Solenoid
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3.2.3 T ransfer Ass’y
It is consisted of PTL(pre-transfer lamp) and Transfer Roller. The PTL sends a light to the OPC drum, makes the current
on the drum surface to low, and improve the transfer efficiency.
The transfer roller delivers the toner of the OPC drum to the paper.
Velocity : 183.02 mm/sec (Drum Velocity x 102.53%)
TR Voltage : +1.3KV 5% (based on 200 , in accordance with media area, Transfer table)
-1.20KV 10% (In cleaning)
Transfer Trigger Current : 6.5 5%
Transfer Efficiency : 85% or more (All envirmnment : preferable media)
Voltage System : Voltage PWM Control System
Transfer Roller
- Material : NBR FOAM ROLL
- Structure : Mono layer
- Resistance : 3E +07 ~ 8E +07 (N/N)
- Hardness : 40 3% (ASKER-C)
- Validlength : 224.2 +0.5/-0mm
- OD : 15.0 0.5mm
- SHAFT Material : SUM -24L + Non-electrolysis Ni. Coating
Life Span : Print over 70,000 sheets (in 15~30 )
3.2.4 Driver Ass’y
3.2.4.1 Motor
Spec : BLDC 55 + PM 49 Motor (2-2 Bipolar) + PM 42 Motor (2-2 Bipolar)
Pull-Out Torque :
- BLDC 55 : 1350 gf. cm(based on actual value) or more (1342rpm, 1.2A(rms))
- PM 49 : 1600 gf. cm(based on actual value) or more (714pps, 1.1A(rms))
- PM 42 : 600 gf. cm(based on actual value) or more (925pps, 0.9A(rms))
TORQUE MARGIN (Tp/0 Tsys) : BLDC 55 : 1350/1047 gf. cm = 1.29
- PM 49 : 1600/809 gf. cm = 1.97
- PM 42 : 600/210 gf. cm = 2.85
Driving Frequency : BLDC 55 : 1342.6 rpm(1007 Clock)
- PM 49 : 892.5 rpm(714 pps)
- PM 42 : 1156.25 rpm(925 pps)
It is a power delivery unit by gearing : BLDC Motor -> Pickup/Feeder/Devloper
- PM 49 Motor -> Fuser/Exit
- PM 42 Motor -> Duplex
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3-8
3.2.4.2 Process Speed
Print Speed : 28/30 PPM (based on A4/LTR)
Opc Drum Vp : 179.7mm/sec
Unit Relative Velocity (Paper Speed)
- Pickup : 206.21mm/sec), 14.75% VS OPC Vp
- Feeder (Cassette) : 183.79mm/sec, 2.28% VS OPC Vp
- Feeder (Frame) : 181.64mm/sec, 1.08% VS OPC Vp
- Transfer : 184.25mm/sec, 2.53% VS OPC Vp
- Fuser : 179.3653mm/sec, 0.19% VS OPC Vp
Jitter
- Vertical : 3 0.018 or less in Vision System
- Horizontal : within 2% of partial magnificence error
Orthogonality : SPEC : 1.0mm or less
3.2.4.3 Acoustic Noise
Warming Up : 49dB or less
Printing : 54dB or less
Stand-by : 39dB or less
System Overview
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3.2.5 Fixing Part (Fuser)
The fuser is consisted of the E-Coil, Heat Roller, Pressure Roller, Thermistor and Themostat.
It adheres the toner to the paper with pressure and a heat to complete the printing job.
3.2.5.1 Halogen Lamp
Voltage 120V : 115 5%
220V : 230 5%
Capacity : 800 Watt 25W
Temp. Distribution : 120%
3.2.5.2 T emperature-Interception Device (Thermostat)
Thermostat Type : Non-Contact type THERMOSTAT
Control Temperature : 150 5
THERMOSTAT-ROLLER Gap : 1.9 0.2mm
3.2.5.3 T emperature Detecting Sensor(Thermistor)
Thermistor Type : HF-R0060 (SEMITEC 364FL Type)
Temperature Resistance : 7 (180 )
SYSTEM Temperature SETTING
- Stand by : 165 5
- Printing : 189 5 (5 minutes before)
184 5 (5 minutes after)
- Overshoot : 200 less
- Overheat : 210 less
3.2.5.4 Heat Roller
Length : 247.5mm
Valid length : 224mm
OD : 26.1 + 0.05, -0.03 (Tubing incl., Crown 0.09~-0.15)
Material : AL(AL5052) + PFA Tubing
Thickness : 0.9mm
Coating Material : PFA 100%
Coating Thickness : 20um (Thickness after abrasion)
GND Type : H/R Bearing Grounding type By SECC Fuser lower frame
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3.2.5.5 Pressure Roller
Shaft
- Length : 251.3mm
- Material : STKM
- Thickness : 6( 20---RUBBER portion)
Rubber
- Material : Silicon Sponge (Tubing Type : 32)
- Length : 226.4mm
- Thickness : 6mm(one-side)
OD : 32.25 0.2(Center part Crown -0.35)
3.2.5.6 Media Separating System
Thflon Coating with PEEK Claw System
3.2.5.7 Safety Relevant Facts
Proteciong device when overheating
- 1st protecting device : H/W cuts off when detecting an overheating
- 2st protecting device : S/W cuts off when detecting overheating
- 3st protecting device : Thermostat cuts off the power
Safety device
- The power of Fuser is cut-off after front cover is open
- The overheating safety device for customer
- The surface temperature of the Fuser Cover is under 80
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3.2.6 LSU (Laser Scanner Unit)
The LSU unit is controlled by video controller. It scans the video data received from video controller with laser beam by
using the rotation principle of the polygon mirror to create the latent image on the OPC drum. It is the core part of LBP.
The OPC drum rotates as the same speed as the paper feeding speed. It creates the /HSYNC signal and sends it to the
engine when the laser beam of the LSU reaches the end of the polygon mirror, and the engine detects the /HSYNC signal
to arrange the vertical line of the image on the paper. After detecting the /HSYNC signal, the image data is sent to the
LSU to arrange the its margin on the paper.
The one side of the polygon mirror is one line for scanning.
Item Specification Item
Resolution Real 600 dpi main direction sub direction
Spot Size Main 75 +20/-20 -beam diameter at the level of 1/e2
of intensity
-at the spot location of 0,
100 of image height
Variation 40 /50 main/sub, within image height of
-100 ~ +100 range
LaserProperty Wavelength 785 + 1 0 / - 15 at 25
Power 0.33 0.02 at the center of image on the
focal plane, with stationary condition,
power supplied at
DC 5 volt
Vignetting Min 80 % spot power variation within image
height of -100 ~ +100
f Property Magnification error Max 0.7 % based on the printable area,
216
Partial Magnification error max 1.5 % based on the 2.54 width within the
printable area, 216
Beam Position Deviation of main scanning 1.0 at the center of image
Deviation of sub scanning 1.0
Scan Line Bow Max 1 within image height
Property Skew Max 1 -100 ~ +100 range
Sync. Property Position 136.7 1.0 distance to synchronization position
from the center of image
Pulse width Min 5.0 sec pulse width of synchronization
Pitch Error Neighbor line Max 10 Pitch error in sub scanning direction
within image height of
-105 ~ +105 range
Within 6 lines Max 20 within image height of
-105 ~ +105 range
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Item Specification Item
Unit assembly state 5
Motor Control PWM control external clock(TTL pulse)
Direction of rotation CCW
Rotational speed 31836.6 rpm normal rotational speed (30ppm)
Rising time Max 6.0sec time to stable rotational speed
Mirror Facet number 4 faces
Inner diameter 14.14
Jitter LF Max 0.030 % within image height of
RF Max 0.020 % -105 ~ +105 range
Motor Driver Supply voltage 24 V 10 % application voltage to the driving
circuit of polygon motor
Starting current Max 2.0 A required current for acceleration
Running current Max 1.0 A required current to stable rotational
speed
Scanning Effective scanning width 216
Property Scanning freq. 2,122.44 one line scanning frequency
Scanning time 471.15
Scanning dot 5,102 dots
1 dot ON time 53.86 time interval from falling 0.9VH to
rising again 0.9VH
Scanning effective 58.3%
Video freq. 18.5648 MHz frequency of video data
Process Speed 179.7 mm/s Drum Speed
Environment Acoustical noise 45dB at normal operation condition,
measuring at 1 m horizontal, 0.75m
vertical apart
Use Temperature +10 ~ +50
Humidity 30 ~ 80 %
Preservation Temperature -20 ~ +60
Humidity 10 ~ 90 %
Size W L H
System Overview
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3.2.7 T oner Cartridge
In the toner cartridge, the OPC unit and the developer unit are in a body.
The OPC unit has OPC drum and charging roller, and the developer unit has toner, toner cartridge, supply roller,
developing roller, and the blade.
3.2.7.1 Summary
Developing Method : Non magnetic 1 element contacting method
Toner : Non magnetic 1 element shatter type toner
Charging capacity : -39.1 3 C/g (KAO meas. method)
Average OD : 8.0 0.5 (Toner)
Toner Qty : 85 gf/140gf (4k / 8k)
The life span of toner: 4k/8k sheets (ISO 19752 5% Pattern / A4 standard )
Toner Residual Sensor : Dot count with CRUM(CRU Monitor)
OPC Cleaning : Collect the toner by using cleaning blade+ FILM OPC
Handling of wasted toner : Collect the wasted toner in the cleaning frame by using cleaning blade
OPC Drum Protecting Shutter : None
Classifying device for toner cartridge: ID is classified by interruption of the frame channel.
3.2.7.2 Developing Roller
Roller type : conductive elastic roller
Rotary Speed : 203.06 mm/sec
Roller Bias : -220V ~ -400 20V
Control Type : Bias PWM Control type
Roller material : Conductive NBR + Surface UV process
- Structure : Mono layer
- Resistance : 1.0E+03~ 1.5E+06 (N/N Condition)
- Hardness : 52 5
- Valid Length : 228 mm
- OD : 14.07 mm 0.05
- Shaft material : SUS 303
- Surface roughness (Ra) : Ra 2.0 ~ 2.5 (Circular-direction)
- Friction coefficient (u) : 0.1 ~ 0.5 (70gf, 50mm/min, OHP (3M,#CG3300))
- Life : 8,000 sheets or more
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3.2.7.3 Supply Roller
Rotary Speed : 131.98 mm/sec
Roller Bias : -370V ~ -550V
Control Type : Bias
Roller material : Silicone Sponge
- Structure : Closed cell
- Resistance : 0.6E+06 ~ 3.0E+06 (N/N cond.)
- Hardness : 16 ~ 25 (Asker "C")
- Valid Length : 218 mm
- OD : 11.2 0.1 mm
- Shaft material : SUM 24L Non-electrolysis Ni. Coating
- Shaft OD : 6 mm + 0 / -0.05
- Driver : Gear Driver (in a direction opposed to D/R)
- Sponge Density : 0.45 , 0.1 g/
- Life : 8,000 sheets or more
3.2.7.4 REGULA TING BLADE
Type : Regulating toner layer by pressure
Material : SUS 301 1/2H CSP t0.08
Valid Length : 228mm
Voltage : -420V ~ -600V
Regulating edge R value : 0.3 0.02mm
Pressure : 42 gf/cm
3.2.7.5 CHARGING PORTION
Type : Conductive Roller Contact-Charge
Rotary Velocity : 179.7 mm/sec
Surface potential : -760 70V (based on OPC , N/N cond.)
Residual potential : -130 V or less (initial)
Control Type : Bias PWM Control
Roller material : Conductive elastic roller (Conductive NBR + SBR)
- Structure : Mono layer (Surface UV process)
- Resistance : 0.75E+06 ~ 5.0E+06 ( N/N cond.)
- Hardness : 50 3 (Asker "A")
- Length : 230 mm
- OD : 12.0 0.05 mm
- Shaft Material : SUM-24L + Non-electrolysis Ni Coating
- Shaft OD : 6 + 0 / -0.05 mm
- Driver : Gear Driver
- Pressure : L:300 gf / R:350 gf
- Roller surface roughness : Ra 1.8 um or less (shaft direction)
- Roller life : 8,000 sheets or more
Roller Voltage : -1.25 ~ -1.70 KV
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