1-54 Service Manual
4025-XXX
Xerographic Components
Xerographics in the printer is made up of ten major components. Six of those
components are housed inside the EP Cartridge. The EP Cartridge is a sealed unit that
contains no field replaceable parts. The EP Cartridge is a CRU (Customer Replaceable
Unit) with an estimated life of 23,000 prints; assuming 5% image coverage of a standard
sheet of A4 paper.
Attached to the Transport Chute:
1. BTR (Bias Transfer Roll)
The BTR transfers the toner image from the drum to the sheet of paper. The BTR
rotates during the print cycle.
2. DTS (Detack Saw)
The DTS helps strip the sheet of paper off of the Drum.
Support components:
3. Toner Sensor
The Toner Sensor is a magnetic sensor that monitors the level of toner remaining
inside the EP Cartridge. The Toner Sensor is attached to the printer frame, inside the
EP Cartridge cavity, and is electrically connected to the MCU PWB.
4. High Voltage Power Supply PWB
Supplies all of the voltages used by the Xerographic components.
Housed inside the EP Cartridge:
5. Drum
The Drum is a hollow aluminum cylinder that has a surface coating of a
photoconductive material. The Drum rotates during the print cycle.
6. Bias Charge Roll (BCR)
The BCR places a uniform DC electrical charge on the surface of the drum. During
the print cycle, the BCR applies an AC voltage to the surface of the drum to
neutralize any electrical patterns remaining from the previous print cycle. The BCR
rotates during the print cycle.
7. Magnet Roll
The Magnet Roll collects toner from the toner reservoir and distributes it to the drum.
The Magnet Roll rotates during the print cycle.
8. Charge Metal Blade (CM Blade)
The CM Blade spreads an even coating of toner across the Magnet Roll. The CM
Blade also gives the Roll a static–electric charge.
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