Samsung ML-2251N Bedienungsanleitung

4-1

Samsung Electronics

Summary of product

Service Manual

4. Summary of Product

This chapter describes the functions and operating principals of the main components.

4.1 Printer Components

4.1.1 Front View

Output Support

Top output tray

(Face down)

Control Panel

Power switch

Paper level indicator

Tray

Multi Purpose Feeder

Front Cover

4-2

Summary of Product

Samsung Electronics

Service Manual

4.1.2 Rear View

Rear output tray

(Face up)

Power receptacle

Parallel port

USB port

LED Description

4-3

Samsung Electronics

Summary of product

Service Manual

4.1.3 Control Panel

1) On Line/Error and Toner Save LEDs

If the On Line/Error light is green the printer is ready to print.

If the On Line/Error light is red the printer is experiencing an error such as jammed paper,

cover open or empty toner cartridge.

If you press the Cancel button while the printer is receiving data the On Line/Error LED

blinks red to cancel printing.

In Manual Feed mode if there is no paper in the Manual Feeder the On Line/Error LED

blinks red. Load paper into the Manual Feeder and the LED stops blinking.

If the printer is receiving data, the On Line/Error LED slowly blinks green.

If the printer is printing the received data, the On Line/Error LED blinks green quickly.

If you press the Cancel button in Ready mode this LED is on and the Toner Save mode is

enabled.

If you press this button once again this LED is off and the Toner Save mode is disabled.

If the On Line/Error and Toner Save LEDs blink at the same time your system has experi-

enced an internal problems. Refer to Section 6.6

4-4

Summary of Product

Samsung Electronics

Service Manual

2) Cancel button

Printing demo page In Ready mode press and hold this button for about 2 seconds until

all LEDs blink slowly and release.

Printing configuration sheet In Ready mode press and hold this button for about 6 seconds until

all LEDs blink quickly and release.

Cleaning inside printer In Ready mode press and hold this button for about 10 seconds until

all LEDs turn on and release. After cleaning the printer one cleaning

sheet is printed.

Canceling print job Press this button during printing. The On Line/Error LED blinks while

the print job is cleared from both the printer and the computer and

then return to Ready mode. This may take some time depending on

the size of the print job.

In Manual Feed mode it is not possible to cancel the print job by

pressing this button.

Toner Save mode on/off In Ready mode, press this button to turn the Toner Save mode on or

off.

4-5

Samsung Electronics

Summary of product

Service Manual

4.2 System Construction

4.2.1 Summary

The ML2250 consists of the following main functional components

1) The Firmware

This controls the whole printing process

2) The Print Engine consisting of

a) Engine frame

b) Paper feed mechanism

The paper mechanism cosists of a 250sheet main cassette, multi-purpose paper tray, pickup rollers, friction

pads and feed rollers. Together with sensors in the feed path these serve to control paper registration and

guide the paper through the Image transfer, image development, image fusing and exit assemblies. The

paper path has an anti-static connection to earth to eliminate paper feed problems due to static charge on

the paper.

c) Main drive mechanism

The main drive is a Bi-polar 2 phase motor. It drives the OPC, Paper Pick-up and paper feed rollers using a

gear train mechanism

d) Image development unit

Using a Laser Scanning Unit (LSU) this section of the mechanism creates the image on the OPC drum

(part of the integrated toner cartridge).

e) Image transfer unit

The function of the this unit uses High Voltages supplied by the HVPS to move the image from the developer

unit onto paper.

f) Image fusing unit

The function of this unit is to permanently fix the toner image onto the paper. This is achieved usibg a

temperature controlled heating unit (the fuser).

g) Electronics PBA including

i) Main control board consisting of

(1) Main processor Asic (166MHz SPGPm)

(2) Memory parts (Flash Rom containing the control program and DRAM for working memory)

(3) Engine interface parts (motor control, fuser control, HVPS control, sensors etc)

(4) PC Interface (USB , Parallel, Network – wired and wireless)

(5) Bus, DMA and I/O handling

ii) Operators panel

iii) PC Interface

4-6

Summary of Product

Samsung Electronics

Service Manual

4.2.2 System Layout

L S U

Toner Cartridge

Fuser

EXIT

Sensor

OPC

DR SR

TR FR

Cassette

Manual eeder

Transfer Roller

user

LSU(Laser Scan Unit)

Toner Cartridge

MP SensorMP Sensor

4-7

Samsung Electronics

Summary of product

Service Manual

4.2.3 Paper Feed

This consists of the standard cassette, an optional cassette, an MP tray for supplying different types of media

(envelopes, labels, special paper) and other parts related to the movement of paper through the printer.

1) Paper separation method

Individual sheets are separated in the cassette using the ‘friction pad’ method. When paper feeds into the machine

it passes over a spring loaded friction pad that separates the sheets of paper.

2) Paper cassette

The paper cassette uses a ‘centre loading’ method There are no paper size sensors. Instead a software process is

used to detect the size of the first sheet of paper as it is fed through the machine. Both the rear and side paper

guides are adjustable to cater for various paper sizes.

There is a ‘Paper Empty’ sensor which detects the presence of paper (Capacity: 250 sheets).

There is an indicator flag on the front of the cassette which indicates the amount of paper remaining.

3) Pick-up roller

The pickup roller is used to pick-up and feed paper into the printer. It also is used to remove any static charge on

the paper.

4) MP tray

The Multi-purpose tray is used to hold non-standard paper sizes and special media (envelopes, transparencies

etc.). There is an MP paper empty sensor. It uses a friction pad method to ensure paper separation and can hold a

maximum of 50 sheets of paper or envelopes.

5) SCF (Second Cassette Feeder)

The optional second cassette unit is identical to the main cassette and has a capacity of 250 sheets.

4.2.4 Transfer Ass’y

Toner is transferred from the OPC drum onto the paper using a PTL (Pre-transfer Lamp) and a transfer roller. The

PTL shines light onto the OPC, this reduces the electrical charge on the surface of the OPC surface and improves

the efficiency of the transfer.

The transfer roller transfers toner from the OPC drum to the paper.

Life span: Print over 60,000 sheets (at 15~30ºC)

4.2.5 Driver Ass'y

Power is provided to the paper drive assembly under the control of the main PWA. The main motor powers the

paper feed, toner cartridge, fuser unit and all pick-up, feed and exit rollers.

4-8

Summary of Product

Samsung Electronics

Service Manual

4.2.6 Fuser

There are two methods of fusing toner onto the paper: the existing heat lamp process and the Q-PID process

developed by Samsung. ML2250 export models, both 110V and 220V, use the heat lamp process.

This consists of a heat lamp, heat roller, pressure roller, thermistor and thermostat. By use of heat and pressure

toner is caused to melt and adhere to the paper surface in order to complete the printing process.

4.2.6.1 Thermistor and Thermostat

The thermistor is used to detect the temperature of the heating unit and feeds this information into the main

processor

If the heat lamp becomes too hot the Thermostat cuts off the power to the lamp in order to prevent over-heating

and any potential fire hazard is removed.

4.2.6.2 Heat roller

The heat roller transfers the heat from the heat lamp to the paper. The surface of the heat roller is coated with

Teflon so that toner does not stick to the surface.

4.2.6.3 Pressure roller

A pressure roller mounted under the heat roller is made of a silicon resin and the surface is also coated with

Teflon. When a paper passes between the heat roller and the pressure roller the toner powder is meted and

adheres to the surface of the paper permanently.

4.2.6.4 Safety features

To prevent overheating

- 1st protection device: Hardware cuts off when overheated

- 2nd protection device: Software cuts off when overheated

- 3rd protection device: Thermostat cuts off mains power to the lamp.

Safety device

- Fuser power is cut off when the front cover is opened

- LSU power is cut off when the front cover is opened

- The temperature of the fuser cover's surface is maintained at less than 80ºC to protect the user and a caution

label is attached where the customer can see it easily when the rear cover is opened.

4.2.7 LSU (Laser Scanner Unit)

This is the core of the laser printer. It converts the video data received from the computer into an electrostatic

latent image on the surface of the OPC drum. This is achieved by controlling the laser beam and exposing the

surface of the OPC drum to the laser light. A rotating polygon mirror reflects the laser light onto the OPC and each

side of the mirror is one scan line. The OPC drum turns as the paper feeds to scan the image down the page.

The /HSYNC signal is created when the laser beam from LSU reaches the end of the polygon mirror and this

signal is sent to the controller. The controller detects the /HSYNC signal to adjust the vertical line of the image on

paper. In other words after the /HSYNC signal is detected the image data is sent to the LSU to adjust the left

margin on the paper.

4-9

Samsung Electronics

Summary of product

Service Manual

4.2.8 Toner Cartridge

The toner cartridge is an integral unit containing the OPC unit and toner unit. The OPC unit consists of the OPC

drum and charging roller, and the toner cartridge unit consists of the toner, supply roller, developing roller, and

blade (Doctor blade)

- Developing Method: Non magnetic 1 element contacting method

- Toner: Non magnetic 1 element shatter type toner

- The life span of toner: 5,000 sheets (ISO19752 standard)

- Toner remaining amount detecting sensor: No

- OPC Cleaning: Film OPC using an electro-static cleaning process.

- Management of waste toner: Collected using an electro-static process and retained within the toner cartridge

--> no waste toner to dispose of.

- OPC Drum protecting Shutter: No.

- Classifying device for toner cartridge: ID is classified by interruption of the frame channel.

4-10

Summary of Product

Samsung Electronics

Service Manual

4.3 Main PBA(SPL Model)

The Engine Board and Controller Board have been integrated into a single PBA. This consists of the CPU and

printer control functions. The CPU functions as the bus controller, I/O handler, motor driver and PC interface. The

main board sends the Current Image Video data to the LSU and manages the Electrophotographic printing

process. Circuits on the PBA drive include the main motor (paper feed, cartridge, fuser), clutch driver, pre-transfer

lamp driver, heat-lamp driver and fan driver.

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

power supply PBA..

1 2 3 4

910

1314

LOW DROP FIXEDANDADJUSTABLE POSITIVE VOLTAGE REGULATORS(LD1117DT) U1

LOW POWER DUAL BIPOLAR COMPARATORS(LM393D) U2

SPREAD SPECTRUM CLOCK GENERATOR(CY25811) U4

CPU X-TAL(12MHz) OSC1

SDRAM(K4S641632H) U6, U15

LOW VOLTAGE HEX INVERTER WITH 5V TOLERANT SCHMITT TRIGGER INPUTS(74LCX14) U7

MOTOR DRIVER(A3977SLP) U9

GRAPHIC PROCESSOR ASIC(SPGPM) U11

LOW VOLTAGE HEX INVERTER WITH 5V TOLERANT SCHMITT TRIGGER INPUTS(74LCX14) U24

PARALLEL PORT SINGLE TERMINATION NETWORK(ST1284) U23

LOW VOLTAGE IEEE 161284 TRANSLATING TRANSCEIVER(161284) U22

VIDEO X-TAL(19.6MHz) OSC3

USB 2.0(NET2270) U25

USB X-TAL(30MHz) OSC4

LOW VOLTAGE OCTAL D-TYPE FLIP-FLOP(74LVX273) U14, U19

LOW VOLTAGE BIDIRECTIONAL TRANSCEIVER(74LCX245) U10

FLASH MEMOTY(29LV160DB) U13

Inhaltsverzeichnis

Andere Samsung Drucker Handbücher

Samsung

Samsung ML-2950ND Bedienungsanleitung

Samsung

Samsung ML-3310D Bedienungsanleitung

Samsung

Samsung ML 1710 - B/W Laser Printer Bedienungsanleitung

Samsung

Samsung ML-5200A Bedienungsanleitung

Samsung

Samsung ML-1600 Series Bedienungsanleitung

Samsung

Samsung CLP-320N Bedienungsanleitung

Samsung

Samsung ML 1740 - B/W Laser Printer Bedienungsanleitung

Samsung

Samsung CLP-670N Bedienungsanleitung

Samsung

Samsung SCX-483 Series Bedienungsanleitung

Samsung

Samsung ML 2851ND - B/W Laser Printer Benutzerhandbuch

Samsung

Samsung CLP-620 Series Bedienungsanleitung

Samsung

Samsung 500N - CLP Color Laser Printer Bedienungsanleitung

Samsung

Samsung ML-1750 Lazett Bedienungsanleitung

Samsung

Samsung SPP 2020 - Photo Printer - 20 Sheets Bedienungsanleitung

Samsung

Samsung ML-3750ND Bedienungsanleitung

Samsung

Samsung ML-4500 Bedienungsanleitung

Samsung

Samsung CLP-600 Series Bedienungsanleitung

Samsung

Samsung ML-3750ND Bedienungsanleitung

Samsung

Samsung xpress C43x series Bedienungsanleitung

Samsung

Samsung ML--6100 Kurzanleitung

Samsung

Samsung SCX-5635FN - Mono Laser P/s/c/f USB Enet 1200X1200 128MB... Bedienungsanleitung

Samsung

Samsung ML-7000P Bedienungsanleitung

Samsung

Samsung ML-2955DW Bedienungsanleitung

Samsung

Samsung Xpress C181xW Series Bedienungsanleitung

Beliebte Drucker Handbücher anderer Marken

Canon

Canon i70 Series Bedienungsanleitung

Evolis

Evolis Elypso Bedienungsanleitung

Kyocera

Kyocera FS-9530DN Bedienungsanleitung

Canon

Canon LASER SHOT LBP-1210 Bedienungsanleitung

Canon

Canon PIXMA PRO-1 Series Bedienungsanleitung

Canon

Canon PIXMA G3560 Einrichtungshandbuch

Dell

Dell Color Laser Printer 2130cn Bedienungsanleitung

Tektronix

Tektronix Phaser 840 Bedienungsanleitung

Brother

Brother 1440 - HL B/W Laser Printer Kurzanleitung

Fuji Xerox

Fuji Xerox DocuPrint P375 dw Bedienungsanleitung

WOOSIM

WOOSIM PORTI-S30 Bedienungsanleitung

Olivetti

Olivetti PG L2140 Bedienungsanleitung

Konica Minolta

Konica Minolta bizhub 224e Bedienungsanleitung

Canon

Canon LBP113w Bedienungsanleitung

Xerox

Xerox DocuColor 5000 Bedienungsanleitung

Canon

Canon PRO-500 Series Einrichtungshandbuch

Epson

Epson ET-7750 Betriebsanleitung

Lexmark

Lexmark Infoprint 1332 Bedienungsanleitung