Samsung ML-3471ND, ML-3470D Service Manual

LASER PRINTER

ML-347x Series

ML-3471ND/XAX

Basic Model : ML-3471ND

SERVICE Manual

	LASER PRINTER		The keynote of Product
		Upgrade to Speed_up model(ML-347x)
		of the ML-3050 serie
		1. Speed: Up to 33ppm (Ltr. 35ppm),
			1200x1200dpi Effective output
		2. Paper Path: MPF Type Cassette
		3. Emulation: PCL6, PS3
		4. CPU: SPGPv3
		5. Memory: 16~64MB Standard
		6. Cassette: 250 sheet Cassette
		7. MP: 50 sheet MP
		8. Lan: 10/100 Base TX (ML-3471ND)
		9. I/O: USB 2.0, IEEE1284
		10. Toner: 10K Toner (4K initial)
		11. Option: 802.11b/g Wireless N/W,
	ML-347x Series		250 sheet Opt. SCF
		12. Duplex: Built in Duplex

Contents

1. Precautions

1.1 Safety Warning 1-1

1.2 Caution for safety

1-2

1.3ESD Precautions1-4

2.Product spec and feature

2.1Product Specifications 2-1

2.1.1Product Overview 2-1

2.1.2Specifications 2-1

2.1.3Model Comparison Table 2-6

2.1.4Accessory List 2-6

2.2System Overview 2-7

2.2.1System Construction 2-7

2.2.2Mechanical Parts Specifications 2-12

2.2.3Engine H/W Specifications 2-18

2.2.4S/W Descriptions 2-28

3.Disassembly and Reassembly

3.1General Precautions on Disassembly 3-1

3.2Screws used in the Printer 3-2

3.3Front Cover 3-4

3.4MP Tray Ass'y 3-5

3.5Rear Cover 3-6

3.6Fuser Ass'y 3-7

3.7Top Cover 3-10

3.8OPE Unit3-11

3.9 Side Cover (Left, Right)

3-12

3.10 Shield Controller Ass'y 3-14

Continued

3.11Drive Ass'y 3-15

3.12Duplex Drive Ass'y 3-16

3.13Shield SMPS Ass'y 3-17

3.14Connection PCB 3-18

3.15 Fuser Drive Ass'y

3-19

3.16Fan 3-20

3.17Pick Up Roller Ass'y 3-21

3.18Duplex Guide Housing (With Feed Roller) 3-22

3.19HVPS Housing 3-23

3.20Cover Mid Front 3-24

3.21MPF Housing 3-24

3.22 Feed Roller Parts

3-25

3.23Pick Up Gear Ass'y & Solenoids 3-27

3.24Exit Roller3-27

3.25LSU 3-28

3.26TERMINAL 3-28

3.27Transfer Roller Parts 3-29

4.Alignment & Troubleshooting

4.1Alignment and Adjustments4-1

4.1.1Sample Pattern4-1

4.1.2Control Panel 4-2

4.1.3Consumables and Replacement Parts 4-7

4.1.4LED Status Error Message4-7

4.1.5Abnormal Image Printing and Defective Roller4-10

4.1.6 How to use DCU

4-11

4.1.7Paper Jam 4-16

4.1.8Download & Reset F/W4-22

4.2Troubleshooting 4-23

4.2.1Procedure of Checking the Symptoms4-23

4.2.2The cause and solution of Bad image 4-24

Continued

4.2.3The cause and solution of the bad discharge 4-40

4.2.4The cause and solution of the malfunction 4-49

4.2.5Toner Cartridge Service 4-59

4.2.6The cause and solutions of bad environment of the software 4-64

5.Exploded Views & Parts List

5.1Main 5-2

5.2Cover Ass'y 5-4

5.3Front Cover Ass'y 5-6

5.4Rear Cover Ass'y5-8

5.5OPE Cover Ass'y5-9

5.6Frame 5-10

5.7MP Ass'y 5-14

5.8Main Drive Ass'y 5-16

5.9Fuser Drive Ass'y 5-18

5.10 Duplex Unit (Optional)

5-19

5.11Fuser Unit5-21

5.12Cassette Unit 5-23

6.System Diagram

6.1Block Diagram 6-1

6.1Connection Dia ram 6-2

7.Reference Information

7.1Troubleshooting Tools7-1

7.2Acronyms and Abbreviations 7-2

7.3Selecting printer locations 7-4

Continued

7.4LAN (Optional Function)7-4

7.5Sample Tests Patterns 7-5

7.6Series model solution(ML-3470D and ML-3471ND) 7-6

7.6.1Double Feed Erro 7-6

7.6.2Jam07-7

7.6.3Jam17-8

7.6.4No Paper/Add Paper" error on the printer and have been unable

to clear it, even when they have verified there is paper in the printer

7-9

7.6.5Open Cover Error 7-10

7.6.6Low Toner 7-11

7.6.7Over Heat Error 7-12

7.6.8Low Heat Error 7-13

7.6.9Fuser Door Open 7-14

7.6.10A noise troubleshooting tree 7-15

7.6.11LSU Error 7-16

7.6.12Scan Lock Error 7-17

7.6.13 Nothing Displayed on LCD

7-18

7.6.14All black printing 7-19

7.6.15Blank Copy 7-20

7.6.16Images at 1 Copy 7-21

7.6.17Glass Broken 7-22

7.6.18Document Jam 7-23

7.7 Parts Life Cycle Maintenance Table

7-24

7.7.1Parts Life Cycle Maintenance Table7-24

7.7.2Toner Cartridge Criterion 7-24

7.8Model Information 7-25

7.8.1Model List 7-25

7.8.2 Understanding for Model Code

7-25

7.8.3Understanding Material Code & Name 7-26

7.8.4F/W Upgrade Method 7-26

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.

	Service Manual	1-1
Samsung Electronics

Precautions

1.2 Caution for safety

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.

1-2 Service Manual

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.

	Service Manual	1-3
Samsung Electronics

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.

1-4 Service Manual

Samsung Electronics

Product specification and feature

22. Product specification and feature

2.1 Product Specifications

2.1.1 Product Overview

Up to 33ppm (Ltr. 35ppm)

PCL6, PS3, 1200x1200dpi

400 MHz, 64MB Standard

-10/100 Base TX

-Opt. 802.11b/g Wireless N/W

ML-3471ND	USB 2.0, IEEE1284

10K Toner (4K Standard)

Built in Duplex

-250 sheet Cassette

-50 sheet MP

-250 sheet Opt. SCF

2.1.2Specifications

Product Specifications are subject to change without notice. See below for product specifications.

2.1.2.1 General Print Engine

ML-347x Series		ML-3470D		ML-3471ND
Engine Speed	Simplex	Up to 33 ppm in A4 (35 ppm in Letter)
	Duplex	Up to 17 ipm in A4 (17.5 ipm in Letter)
Warmup time	From Sleep	Less than 15 sec, Cold warm-Up time : 15sec
FPOT	From Ready	Less than 8.5 sec
	From Idle	Less than 23.5 sec
	From Coldboot	Less than 30 sec
Resolution	-	Up to 1,200 x 1,200 dpi effective output

	Service Manual	2-1
Samsung Electronics

Product specification and feature

2.1.2.2 Controller & S/W

ML-347x Series		ML-3470D	ML-3471ND
Processor		Samsung 400 MHz
Memory	Std.	32 MB	64 MB
	Max.	288 MB	320 MB
Printer Languages	-	PostScript3, PCL6, SPL, IBM ProPrinter, EPSON
Fonts	-	45 scalable, 1 bitmap, 136 PostScript3 fonts
Driver	Default Driver	SPL
	Supporting OS	Windows 2000/XP/2003/Vista
		Various Linux OS including Red Hat, Caldera, Debian, Mandrake, Slackware,
		SuSE and Turbo Linux
		Mac OS 8.6~9.2/10.1~10.4
	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	SAS (Samsung Admin Service), SetIP
Interface
Parallel	-	IEEE 1284
USB	-	USB 2.0
Wired Network	-	N/A	Ethernet 10/100 Base TX (Internal)
Wireless Network	-	N/A	Optional (Internal) 802.11b/g
			Wireless LAN (Internal)
User Interface
LCD	-	2 x 16 Character without backlit
Key	-	8 Key: Stop, Toner Save, Duplex
		< , OK, >, Menu, Back

2-2 Service Manual

Samsung Electronics

Product specification and feature

2.1.2.3 Paper Handling

ML-347x Series		ML-3470D		ML-3471ND
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/ (20lb bond)
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, Thick, Thin, Recycled, Archive
Media weight	-	16~28lb (60 to 105g/	)
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, Thick, Thin, Recycled, Archive
Media weight	-	16~28lb (60 to 105g/	)
Sensing	-	Paper empty sensor
Output Stacking
Capacity	Face-Down	150 sheets @ 75g/
	Face-Up	1 sheet @ 75g/
Output Full sensing	-	N/A
Duplex
Supporting	-	Built-in
Media sizes	-	A4, Letter, Legal, Folio, Oficio
Media types	-	Plain Paper
Media weight	-	20~24lb (75 to 90g/	)

	Service Manual	2-3
Samsung Electronics

Product specification and feature

2.1.2.4 Consumables

ML-347x Series		ML-3470D	ML-3471ND
Toner	Black	4,000 pages @ ISO 19752 Coverage(Standard 4,000 pages, High Yield
		10,000 pages)
	Key	Electronic key(CRUM) Only
	Life detect	Toner gauge sensor by dot count
Drum	Yield	12,000 Images

2.1.2.5 Reliability & Service

ML-347x Series		ML-3470D	ML-3471ND
Printing Volume	-	9,200 sheets-per year / 767 sheets-per month / 38 sheets-per day
(SET AMPV)
5.2 Max. Monthly Duty	-	35,000 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	Yes
	Operation	Yes

2.1.2.6 Environment

ML-347x Series		ML-3470D	ML-3471ND
Acoustic Noise Level	Printing	Less than 52.0 dBA
(Sound Power/Pressure)
	Standby	Less than 26.0 dBA
	Sleep	Back Ground Level
Power Consumption	Ready	Less than 130W
	AVG.	Less than 400W
	Max/Peak	Less than 700W
	Sleep/Power Off	Less than 11W / Less than 0.4W
Dimension(W x D x H)	SET	400 x 433.4 x 285 mm
Weight	SET	10.5 kg (23.15 Pounds)
	Gross	14.5kg (31.9 Pounds)

2-4 Service Manual

Samsung Electronics

Product specification and feature

2.1.2.7 Options

ML-347x Series		ML-3470D		ML-3471ND
*Memory	-	16 MB, 32 MB, 64 MB, 128 MB, 256MB
Second Cassette	-	250-sheet Cassette Tray
Wired Network	-	N/A		Ethernet 10/100 Base TX
				(External) - ML-00ND
Wireless Network	-	N/A		802.11b/g Wireless LAN (Internal)
Hard Disk	-	N/A
Duplex Unit	-	Default

* Memory : The ML-3470D or ML-3471ND has 64MB of memory which can be expanded to 320MB.

Item	Description	Model Code	Size
		(order)
Memory DIMM	Exlends your Printers	ML-00MA	16MB
	memory capacity.	ML-00MB	32MB
		ML-00MC	64MB
		ML-00MD	128MB
		ML-MEM140	256MB

* Use only the samsung-approved DIMM.

2.1.2.8 Others

ML-347x Series		ML-3470D	ML-3471ND
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

	Service Manual	2-5
Samsung Electronics

Product specification and feature

2.1.3 Model Comparison Table

	SEC	SEC	SEC	SAMSUNG
	ML-2550	ML-3050	ML-3471ND	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	Yes	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 2000/	Win 95/98/NT/2000/
	Me/XP, Mac	Me/XP, Linux	Me/XP, Linux	Me/XP, Linux
Toner	10K	4K/8K	4K/10K	6K/12 K

2.1.4 Accessory List

JC99-02059A [INA-ACCESSORY] 3903-000085 [CBF-POWER CORD] 6801-00761C [CARD-WARRANTY] 6902-000809 [BAG PE]

JC46-00293A [S/W APPLICATION-CD]

JC46-00354A [S/W APPLICATION-CD] JC68-00761B [MANUAL-REGISTRATION_FROM] JC68-01579A [MANUAL-NETWORK GUIDE] JC68-01584A [LABEL(P)-BLANK 90*25] JC68-00690A [MANUAL-(CARD)WARRANTY CARD] JC68-00761D [MANUAL-REGISTRATION] JC68-01344A [MANUAL-WARRANTY CARD] JC68-01563A [MANUAL-800 SEC CARD]

2-6 Service Manual

Samsung Electronics

Product specification and feature

2.2 System Overview

2.2.1 System Construction

2.2.1.1 SUMMARY

ML-347x Series 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-347x Series, 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-347x Series, 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-347x Series, the driving device is consisted of f55 BLDC motor, OPC, Pick-up, Feed, Gear-Train connected with Mounting member. - to be changed

2.2.1.2 System Layout

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

	Service Manual	2-7
Samsung Electronics

Product specification and feature

2.2.1.2(a) Feeding Section

Feeding Method : Universal Cassette Type

Feeding Standard : Center Loading

Feeding Capacity : Cassette 250 Sheets (75g/, 20lb StandardPaper)

2.2.1.2(b) Transfer Ass’y

In Warranty( Life time) : Within 70,000 sheets printing

2-8 Service Manual

Samsung Electronics

Product specification and feature

2.2.1.2(c) 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

Drive Ass'y

Connection

PCB

Duplex Motor

Duplex Drive Ass'y

2.2.1.2(d) Fuser Ass’y

Fusing Type : Lamp Type

Heat Roller : [28.3 with 0.1 Crown ]

Pressure Roller Pressure Roller 2 : [electrically conductive]

Thermistor - Temperature Detecting Sensor

Thermostat - Overheat Protection Device

		Service Manual
			2-9
Samsung Electronics

Product specification and feature

2.2.1.2(e) 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

2.2.1.2(f) 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

2-10 Service Manual

Samsung Electronics

Product specification and feature

2.2.1.2(g) Duplex Unit

Duplex printing function as factory option

Available Paper : Letter, Legal, Folio, Oficio and A4

2.21.2(h) Optional Tray (SCF)

For customer covenience in managing paper

Capacity : 250 sheets

	Service Manual	2-11
Samsung Electronics

Product specification and feature

2.2.2 Mechanical Parts Specifications

2.2.2.1 Frame

Material : PC + ABS V0 NH-1000T(Cheil Industries)

Weight : 1.0kg

2.2.2.2 Feeding Part

Feeding Type : Universal Cassette Type

Feeding Standard : Center Loading

Feeding Qty : Cassette 250 sheets (75g/, 20Ib paper standard) MPF 50 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

Paper detecting Sensor : Photo Sensor Paper Size Sensor : None

Paper Separating Pad Material : NBB 52= 0.8~1.2

Separating Pad Pressure : 190gf

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 : Face Down

Feed Roller Driver : Solenoid

2.2.2.3 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.

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)

2-12 Service Manual

Samsung Electronics

Product specification and feature

2.2.2.4 Driver Ass’y

2.2.2.4(a) Motor

Spec : BLDC 62 + PM 55 Motor (2-2 Bipolar) + PM 42 Motor (2-2 Bipolar)

Pull-Out Torque:

BLDC62 : 1500 gf.cm(based on actual value) or more (1342.4rpm, 1.8A)

PM 55 : 1490gf.cm(based on actual value) or more (711pps, 0.9A)

PM 42 : 240gf.cm(based on actual value) or more (1850pps, 0.6A)

TORQUE MARGIN (Tp/oTsys) : BLDC62 Motor : 1500/1100 gf.cm=1.36

PM 55 Motor : 1490/1053 gf.cm = 1.41

PM 42 Motor: 240/165 gf.cm = 1.45

Driving Frequency: BLDC62 Motor : 1342.4 rpm(1006.8 Clock)

PM 55 Motor : 888.75 rpm(711 pps)

PM 42 Motor : 1156 .25rpm(1850 pps)

It is a power delivery unit by gearing: BLDC62 Motor -> Pickup/Feeder/Developer

PM 55 Motor -> Fuser/Exit

PM 42 Motor -> Duplex

2.2.2.4(b) Process Speed

Print Speed : 33/35 PPM (based on A4/LTR )

Process Speed : 211.78 mm/sec

Jitter

Vertical : 30.018 or less in Vision System

Horizontal : within 2% of partial magnificence error

Orthogonality : SPEC : 1.0 mm or less

2.2.2.4(c) Acoustic Noise

Warming Up : 43dB or less

Printing : 52dB or less

Stand-by : 26dB or less

	Service Manual	2-13
Samsung Electronics

Product specification and feature

2.2.2.5 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.

2.2.2.5(a) Halogen Lamp

Voltage 120V : 115 5%

220V : 230 5%

Capacity : 800 Watt 25W

Temp. Distribution : 120%

2.2.2.5(b) Temperature-Interception Device (Thermostat)

Thermostat Type : Non-Contact type THERMOSTAT

Control Temperature : 1705

THERMOSTAT-ROLLER Gap : 1.6 0.2mm

2.2.2.5(c) 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 : 210less

2.2.2.5(d) Heat Roller

Length : 247.5mm

Valid length : 224mm

OD : 28.3 + 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

2-14 Service Manual

Samsung Electronics

Product specification and feature

2.2.2.5(e) Pressure Roller

Shaft

-Length : 251.3mm

-Material : SUM

-Thickness : 6( 14 - RUBBER portion)

Rubber 1

-Material : Silicon Rubber (Tubing Type : 20)

-Length : 226.4mm

-Thickness : 5mm(one-side)

Rubber 2

-Material : Silicon Rubber (Tubing Type : 16)

-Length : 226.4mm

-Thickness : 5mm(one-side)

OD : 1) 20 0.2(Center part Crown -0.2) 2) 16 0.2(Center part Crown -0.15)

2.2.2.5(f) Media Separating System

PI Coating with PPS Claw System

2.2.2.5(g) 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

	Service Manual	2-15
Samsung Electronics

Product specification and feature

2.2.2.6 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.

2.2.2.7 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.

2.2.2.7(a) 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 : 8.5 0.5 (Toner)

Toner Qty : 125 gf/250gf (4k / 10k)

The life span of toner: 4k/10k sheets (ISO 19752 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.

2.2.2.7(b) 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 : 10,000 sheets or more

2-16 Service Manual

Samsung Electronics

Product specification and feature

2.2.2.7(c) Supply Roller

Rotary Speed : 131.98 mm/sec

Roller Bias : -370V ~ -550V

Control Type : Bias

Roller material : Nylon Fur

-Structure : Closed cell

-Resistance : 0.6E+05 ~ 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 : 8.2 mm + 0 / -0.05

-Driver : Gear Driver (in a direction opposed to D/R)

-Sponge Density : 0.45 , 0.1 g/

-Life : 10,000 sheets or more

2.2.2.7(d) 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

2.2.2.7(e) 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 : 10,000 sheets or more

Roller Voltage : -1.25 ~ -1.70 KV

	Service Manual	2-17
Samsung Electronics

Product specification and feature

2.2.3 Engine H/W Specifications

2.2.3.1 ML-347x (PCL) Main Board

The Engine Board and the Controller Board are in one united board, and it is consisted of CPU part and print part in functional aspect. The CPU is functioned as the bus control, I/O handling, drivers, and PC interface. The main board sends the Current Image of Video data to the LSU and manages the conduct of Electrophotography for printing. It is consisted of the circuits of the motor (paper feed, pass) driving, clutch driving, pre-transfer lamp driving, current driving, and fan driving.

The signals from the paper feed jam sensor and paper empty sensor are directly inputted to the main board.

2.2.3.1(a) Asic(SPGPv3)

CPU Core : ARM1020E

- 32KB instruction cache and 32KB data cache

Operating Frequency

-CPU Core : over 300MHz

-System Bus : 100MHz

SDRAMC

-32Bits Only, 100MHz

-5 Banks (Up to 128MB per Bank)

ROMC

- 4 Banks (Up to 16MB per Bank)

IOC

- 6 Banks (Up to 16MB per Bank

DMAC

- 4 Channels HPVC

-Dual/Single Beam

-LVDS Pad(VDO, HSYNC)

UART

- 5 Channels (1 Channels Supports DMA Operation)

PCI Controller

-32Bits, 33/66MHz

-PCI Local Bus Specification rev2.2 Complaint

-Host / Agent Mode (Support 4 Devices in Host Mode)

NAND Flash Controller

-8/16Bits, H/W EEC Generation

-Auto Boot Mode (Using Internal SRAM, 4KB)

MAC

-10M/100Mbps

-Full IEEE 802.3 Compatibility

Engine Controller

-LSU Interface Unit

-Step Motor : 2 Channels

-PWM : 8 Channels

-ADC : 6 Channels

I2C Controller

- I2C(S-BUS) Slave Device Support(I2C Version 2.1)

RTC

- RTC Core Voltage : 3V

PLL

- 3 PLL : MAIN, PCI, PVC

2-18 Service Manual

Samsung Electronics

Product specification and feature

2.2.3.1(b) Memory

Flash Memory : It stores System Program and downloads the System Program through PC Interface, and in case of model for export it compresses the PCL font, then stores it.

-Capacity : 32M Byte (NAND Flash)

-Random Access Time : 10 us (Max)

-Serial Page Access Time : 50ns (Min)

DRAM : It is used as Swath Buffer, System Working Memory Area, etc. when printing.

It stores Font List, compressed into Flash memory, on DRAM and uses it as PCL font in case of model for export.

-Capacity : 64M Byte(Basic), up to 320Mbyte (User Option)

-Type : SDRAM 100MHz/133MHz , 16bit

2.2.3.1(c) Others

The Option PBA can be mounted for supporting the serial communication.

Main board

Flash ROM

PHY IC

USB IC

SPGPv3

SDRAM (ASIC)

SRAM

	Service Manual	2-19
	Samsung Electronics

Product specification and feature

2.2.3.1(d) Flash Memory

It stores the system program and downloads system program through the PC Interface.

Capacity : 16M Byte (NOR Flash)

Access Time : 90ns

Page read Time : 25ns

2.2.3.1(e) SDRAM

It is used as swath buffer, system working memory area, etc. while Printing.

Capacity : The 64M Bytes is for this model (64M : Printing System Working Memory Area)

2.2.3.1(f) Sensor Input Circuit

Paper Empty Sensing

The Paper empty sensor (Photo Interrupter) on the HVPS informs the state of paper to CPU whether it is empty or not with operation of the actuator.

When cassette is empty, it detects the fact by reading the E20 of CPU, and then informs the fact by displaying the RED.

MP Sensing

By operation of Actuator on the frame, an individual MP Sensor (Photo interrupter) informs the state of paper to CPU whether it is empty or not. It reads the D17 of CPU for recognizing paper in MP, and paper is fed from MP if there is.

Paper Feeding/With Toner Cartridge Sensing

When paper passes the actuator (feed sensor part), it detects the signal of Photo interrupter, informs the paper feeding state to CPU, and then sprays the image data after certain time.

If it doesn t detect the feed sensor within 1sec. after paper is fed, paper Jam0 is occurred (LED will be display RED color). The fact whether the developer is inserted or not is detected by CRUM. After the developer is mounted, the subCRUM can read the information of toner cartridge from contact with CRUM involved in toner cartridge. If the information of toner cartridge is invalid, it will show invalid sign on a LCD or LED.

Paper Exit Sensing

It detects paper state whether paper gets out from the set with operation of exit sensor on the HVPS and actuator on the frame. Paper detects the on/off time of exit sensor by reading D22 of CPU, and the normal operation or jam information is informed to the CPU.

The paper JAM2 is informed. (LED will be display RED color)

Cover Open Sensing

The Cover open sensor is located on the HVPS. After the front cover is opened, +24VS (DC fan, Solenoid, Main Motor, Polygon motor part of LSU and HVPS), which is supplied to the each unit, is cut off. The cover-open sensing is operated by the D23 of CPU.

In case, the red will be ON for informing the facts to user.

2-20 Service Manual

Samsung Electronics

Product specification and feature

DC FAN / SOLENOID Driving

It is driven by transistor and controlled by D14(FAN MAIN), E16(FAN DUPLEX), C23(PICK-UP CLUTCH), C18(REGI CLUTCH), D15(MPF CLUTCH) of CPU.

When it is high, the fan is driving by turning on the TR, and it is off when the sleep mode is selected. There are three solenoids, and they are driven by paper pick-up, regi and MPF signal. It is turned on or off by C23, C18, D15 of CPU. The diode protects the driving TR from the noise pulse, which is flown when the solenoid id de-energizing.

FAN Driving Circuit is driven by Transistor, and controlled by D14, E16 of CPU.

Motor Driving

The main motor driving circuits is on the BLDC Motor Ass y Unit. Main Controller has the interfacing circuits. There is motor driver IC on the motor control board of Motor Ass y Unit.

The exit motor driving circuits is formed when the driver IC is selected. The AN44060A Motor Driver IC is used in this case. The resistance Rs value for sensing and voltage value for the V reference can be changed by motor driving voltage value. The motor driving voltage is calculated with the following formula.

IN 0, 2	IN 1, 3	Output Current
L	L	Vref / (10*Rs) = Iout
H	L	Vref / (15*Rs) = Iout * 2/3
L	H	Vref / (30*Rs) = Iout * 1/3
H	H	0

The motor driving circuit is formed when the Driver IC is selected. The A3977 Motor Driver IC is used in this case. The resistance Rs value for sensing and voltage value for the V reference can be changed by motor driving voltage value. The motor driving voltage is calculated with the following formula.

I = Vref / Rs, wherein Vref is (R15V) / (R1+R2).

	Service Manual	2-21
	Samsung Electronics