Samsung SCX 4920N Operation Instruction & Installation
Summary of Product
Service Manual
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4. Summary of Product
This chapter describes the functions and operating principal of the main component.
4.1 Printer Components
4.1.1 Front View
Service Manual
Summary of Product
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4.1.2 Rear View
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# Use the: When you want to:
1 Automatic Document Load the document for copying, scanning, or
Feeder sending faxes.
2 Operator Panel Operate the machine.
3 Paper O utput Keep print media from falling off the front
Extension output tray.
4 Bypass Tray Load print media one sheet at a time.
5 Optional Tray2 Load paper into the optional Tray2.
6 Tray1 Load paper into the standard Tray1.
7 Front Cover Access the toner cartridge.
8 Front Output Tray Hold paper as it exits from the front of the
machine.
9 ADF Output Tray Hold the document as it exits the ADF.
10 Scanner Glass Place a document on the scanner glass for
copying, scanning and sending faxes.
Summary of Product
Service Manual
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# Use the: When you want to:
11 Document Cover Open to place a document on the scanner glass.
12 Document Input Tray Load the document for copying, scanning and
sending faxes.
13 Document Guides Ensure proper document feeding.
14 Rear Cover Open to remove the paper jams and use the
rear output slot when you print the documents
from the Bypass tray.
15 Rear Output Slot Hold paper as it exits at the rear of the machine.
16 Power Switch and AC Supply power to the machine.
Power Cord Connector
17 FAX Jack Connect the telephone line to your machine. If
you use this machine in the serial countries,
such as Germany and Sweden, this socket
may be blocked.
18 Phone Jack Connect the telephone or answering machine
to your machine.
19 Optional Tray2 Cable Connect the optional Tray2 to your machine.
Connector
20 USB Cable Connector Insert the USB cable.
21 Network Port Connect the printer to the network port.
22 Control Board Cover Install the optional memory card.
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Summary of Product
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4.1.3 Control Panel
Summary of Product
Service Manual
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4.2 System Layout
4.2.1 Feeding section
There is a universal cassette, which supplies paper to the machine, and the manual feeder, which supplies
paper one by one. The cassette has the friction pad, which separates paper one by one and prevent multisheet feeding. There is a sensor to detect the existence of paper in the cassette.
- Feeding Method: Universal Cassette Type
- Feeding Standard: Center Loading
- Feeding Capacity: Cassette-250 sheets (80g/m2, 20lb paper standard)
Manual 1 sheet (Paper, OHP, Envelope, etc.)
- Paper detecting sensor: Photo sensor
- Paper size sensor: None
4.2.2 Transfer Ass’y
It consists of the PTL (pre-transfer lamp) and the Transfer Roller. The PTL sends a light to the OPC drum,
making the current on the drum surface to low and improves the transfer efficiency.
The transfer roller transfers toner from the OPC drum surface to the paper.
- Life span: 60,000 sheets (in 15~30°C)
4.2.3 Drive Ass’y
- It is motor driven gear unit, which drives the feeding unit, the fusing unit, and the distributing unit
4.2.4 Fuser
- The fuser consists of the Heat Lamp, Heat Roller, Pressure Roller, Thermistor, and Thermostat. It melts
the toner to the paper with pressure and a heat to complete the printing job.
4.2.4.1 Thermostat
The thermostat is a temperature-sensing device, which cuts off the power to prevent overheating or a fire
when the heat lamp or the heat coil of the heat roller becomes too hot.
4.2.4.2 Thermistor
The Thermistor detects the surface temperature of the heat roller and it maintains the regular temperature
of the heat roller by responding to the information of the heat roller’s temperature.
4.2.4.3 Heat Roller
The heat roller transfers the heat from the heat lamp coil to the surface of the paper.
The melted toner cannot stick to the Teflon coated heat roller.
4.2.4.4 Pressure roller
The pressure roller mounted right under the heat roller is made of the silicon resin. The toner fuses onto
the paper when it passes between the heat roller and the pressure roller.
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