Paper Feed; Transfer Assembly; Drive Assembly; Fuser Assembly - Xerox WorkCentre PE120 Service Manual

Product Summary

4.3.1 Paper Feed

The paper feed system consists of an automatic document feeder, a 250-sheet main paper tray, bypass tray (MP),
pickup rollers, friction pads and feed rollers. The rollers and sensors in the paper feed path 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 ground to eliminate problems due to static charge on the paper.
1. Paper Separation Method
Individual sheets are separated into each tray using the 'friction pad' method. When paper feeds into the
system it passes over a spring loaded friction pad that separates the sheets of paper.
2.
Paper Tray (cassette)
The paper trays use a 'center 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 printer. Both the rear and side paper
guides are adjustable 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 tray which indicates the amount of paper remaining.
3.
Pick-Up Roller
The pick-up roller is used to pick and feed paper into the printer. It also is used to remove any static charge on
the paper.
4.
Bypass Tray (MP)
The multi-purpose tray is used to hold non-standard or custom paper sizes and special media (envelopes,
transparencies, etc.). There is a bypass tray paper empty sensor. The Bypass Tray uses a friction pad method to
ensure paper separation and can hold a maximum of 50 sheets of paper or envelopes.
5.
Lower Tray Assembly (Tray 2)
The optional tray unit is universal with the main tray and also has a capacity of 250 sheets.

4.2.4 Transfer Assembly

The transfer roller transfers toner from the OPC drum to the paper. 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, reducing the
electrical charge on the OPC surface improving the efficiency of the transfer.

4.2.5 Drive Assembly

The drive assembly receives power from the main controller board. The main motor powers the paper feed, toner
cartridge, fuser unit and all pick-up, feed, and exit rollers.

4.2.6 Fuser Assembly

The fuser assembly uses a heat lamp process. This consists of a heat lamp, heat roller, pressure roller, thermistor,
and thermostat. By use of heat and pressure, toner is melted to 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.
4-8 WorkCentre PE 120/120i