System Layout - Dell 1600n - Multifunction Laser Printer B/W Service Manual

Summary of Product

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 multi-
sheet 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/m
- 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.
Service Manual
4-6
Manual 1 sheet (Paper, OHP, Envelope, etc.)
, 20lb paper standard)
2