Samsung ML-3050, ML-3051N Service Manual

LASER PRINTER

ML-3050 Series

ML-3051N/XAA

Basic Model : ML-3050

SERVICE Manual

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: 802.11b/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

1.1Safety Warning 1-1

1.2Safety Caution 1-2

1.3ESD Precautions1-4

2.Product Specification

2.1Product Overview 2-1

2.2Specifications 2-2

3.System Overview

3.1System Construction 3-1

3.2 Mechanical Parts Specifications

3-6

3.3Engine H/W Specifications 3-15

3.4S/W Descriptions 3-31

4.Alignment and Adjustments

4.1Sample Pattern 4-1

4.2Control Panel 4-2

4.3Consumables and Replacement Parts 4-7

4.4LED Status Error Message4-7

4.5Abnormal Image Printing and Defective Roller 4-10

4.6How to use DCU 4-11

4.7Paper Path 4-16

4.8Download & Reset F/W 4-28

Continued

5.Disassembly and Reassembly

5.1General Precautions on Disassembly 5-1

5.2Disassembly 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

6.4Toner Cartridge Service 6-19

6.5The cause and solutions of bad environment of the software 6-27

7.Exploded Views & Parts List

7.1Main 7-2

7.2Cover Ass'y 7-4

7.3 Front Cover Ass'y

7-6

7.4Rear Cover Ass'y7-8

7.5OPE Cover Ass'y7-9

7.6Frame 7-10

7.7MP Ass'y 7-14

7.8Main Drive Ass'y 7-16

7.9Fuser Drive Ass'y 7-18

7.10 Duplex Unit (Optional)

7-19

7.11Fuser Unit7-21

7.12Cassette Unit 7-23

8.Block diagram

8.1System Block Diagram 8-1

8.2System Timing Chart 8-2

Continued

9.Connection Diagram

9.1Connection Diagram 9-1

10.Schematic Diagram

10.1Main Board 10-1

10.2OPE LCD 10-14

10.3OPE LED 10-15

10.4SMPS 110V 10-16 SMPS 220V 10-17

10.5HVPS 10-18

11.Reference Information

11.1Troubleshooting Tools 11-1

11.2Acronyms and Abbreviations 11-2

11.3Selecting printer locations 11-4

11.4Sample Tests Patterns 11-5

12.Series model solution(ML-3050 and SCX-5530FN)

1	Precautions

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	1-1

Precautions

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 current 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 staples. 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 lightening.

(10)Avoid the place where is moisture or has dust. Do not install the printer where lots of dust or around humidifier. A fire 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.

(11)Avoid 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. A fire 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 ventilator. An electric shock could happened.

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Samsung Electronics

Precautions

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 happened 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	1-3

Precautions

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.

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Product Specifications

22. Product Specifications

2.1 Product Overview

Up to 28ppm (Ltr. 30ppm)

PCL6, PS3, 1200x1200dpi

400 MHz, 16~64MB Standard

-10/100 Base TX

-Opt. 802.11b/g Wireless N/W

ML-3051ND	USB 2.0, IEEE1284

8K Toner (4K Standard)

Built in Duplex (ML-3051ND)

-250 sheet Cassette

-50 sheet MP

-250 sheet Opt. SCF

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

Samsung Electronics	Service Manual	2-1

Product Specifications

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/	PCL6: Win95/98/NT4.0/2000/Me/XP/2003
		2000/Me/XP/2003	PS3: Win9x/NT4.0/2000/Me/XP/2003 PPD,
		SPL: Linux, Mac	Mac PPD, Linux PPD
		PS3: N/A (Factory Option)	KS/KSSM: DOS
		KS/KSSM: DOS
Wired Network	Protocol	External : SPX/IPX, TCP/IP, SNMP, HTTP 1.1
	Supporting OS	External : Microsoft	Microsoft Windows 98/ME/2000/XP/2003
		Windows 98/ME/2000/	Microsoft Windows NT 4.xMac OS 8.6 and
		XP/2003Microsoft	aboverVarious Linux OS including Red Hat,
		Windows NT 4.xMac OS	Caldera, Debian, Mandrake, Slackware, SuSE
		10.3Various Linux OS	and Turbo LinuxNovell 4.x,5.x,6.x
		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	External : Microsoft	Microsoft Windows 98/ME/2000/XP/2003
		Windows 98/ME/2000/	Microsoft Windows NT 4.xMac OS 8.6 and
		XP/2003Microsoft	aboverVarious Linux OS including Red Hat,
		Windows NT 4.xMac OS	Caldera, Debian, Mandrake, Slackware, SuSE
		10.3Various Linux OS	and Turbo LinuxNovell 4.x,5.x,6.x
		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

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Product Specifications

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	2-3

Product Specifications

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/ )

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Product Specifications

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	2-5

Product Specifications

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	802.11b/g Wireless LAN (Internal)
		(External) - ML-00LA
Hard Disk	-	N/A
Duplex Unit	-	N/A		Default

* 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

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

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Product Specifications

2.3 Model Comparison Table

SEC	SEC	SEC	SAMSUNG
ML-2550	ML-3050	ML-2570	ML-3560
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

ACCESSORY

Item		Code	Quantity
INA-ACCESSORY		JC99-01950K	-
CBF-POWER CORD		3903-000085
CBF-POWER CORD		3903-000146
CBF-POWER CORD		3903-000190
BAG PE		6902-000288
CBF INTERFACE-USB		JC39-00001A
S/W APPLICATION-CD		JC46-00276A
MANUAL-(CARD)WARRANTY CARD		JC68-00690A
LABEL(P)-BLANK 90*25		JC68-01584A

Samsung Electronics	Service Manual	2-7

System Overview

33. 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-Exit
	Roller-Heat	Duplex
Roller-REGI
OPC
Roller-MP
Roller-Transfer	Roller-Pressure
Roller-Feed
Roller-Pickup

Samsung Electronics	Service Manual	3-1

System Overview

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

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Samsung Electronics

System Overview

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

Drive Ass’y

Connection

PCB

Duplex Motor

Duplex Drive Ass'y

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

Samsung Electronics	Service Manual	3-3

System Overview

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

3.1.2.6 Toner 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

2 Cleaning Roller
0.16mW	VDC = -460V
	VPP = 1520V, f = 2.5KHz, Duty(-) = 32%
		4
-1.25KV		- +
	-650V	200V
	-50V
1

8 Cleaning Blade

3

6

5

+4.2kV

7

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Samsung Electronics

System Overview

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

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System Overview

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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Samsung Electronics

System Overview

3.2.3 Transfer 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 : 6.55%

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 : 403% (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

Samsung Electronics	Service Manual	3-7

System Overview

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 : 30.018 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

3-8 Service Manual

Samsung Electronics

System Overview

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 Temperature-Interception Device (Thermostat)

Thermostat Type : Non-Contact type THERMOSTAT

Control Temperature : 1505

THERMOSTAT-ROLLER Gap : 1.9 0.2mm

3.2.5.3 Temperature 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 : 200less

-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

Samsung Electronics	Service Manual	3-9

System Overview

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

3-10 Service Manual

Samsung Electronics

System Overview

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 +10/-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

	Service Manual	3	-11
	Samsung Electronics

System Overview

		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

3-12 Service Manual

Samsung Electronics

System Overview

3.2.7 Toner 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 : 525

-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

	Service Manual	3	-13
	Samsung Electronics

System Overview

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 REGULATING 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 : 503 (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

3-14 Service Manual

Samsung Electronics