Photoconductor Unit - Epson AcuLaser C1100 Service Manual

EPSON AcuLaser C1100

2.5.2 Photoconductor Unit

MAIN FUNCTIONS
Photoconductor Unit consists of the Belt, Belt Cleaner, Drum, Drum Cleaner, 1st BTR,
and Waste Toner Boxes for each cleaner. And ANTENNA ASSY, SENSOR TR-0,
SENSOR ASSY ADC, SENSOR IBT RETRACT, SENSOR HUM & TEMP, MOT
ASSY P/R, IBT Brush Motor, and IBT Cleaner Retract Motor are installed inside the
printer for control of Photoconductor Unit operation.
Photoconductor Unit
The toner images of each color developed on the drum surface are transferred
to the IBT Belt one color at a time from 1st BTR, and the full color toner
image is formed by overlaying the four colors. The full color toner image is
transferred to paper by positively charging the paper with the 2nd BTR.
Toner remaining on the Belt surface is collected in the Waste Toner Box by
the Cleaning Blade and brush in the Belt Cleaner.
The Drum is made of conductive material (aluminum cylinder) coated with a
photosensitive material which becomes insulating material in darkness and
becomes conductive when it is subjected to light. The Drum Cleaner consists
of a Cleaning Blade and Waste Toner Box, and scrapes off toner remaining on
the drum surface by the Cleaning Blade that contacts with the drum.The
Waste Toner Box contains an actuator for SENSOR TNER FULL. This
actuator operates as the amount of collected waste toner increases to block
light entering the sensor to detect a full toner state.
The 1st BTR is a conductive roller, and is charged positively by the HVPS.
The 1st BTR contacts the back side of the belt to positively charge it.
Specific data relating to Photoconductor Unit is stored in CRUM XERO.
IBT Brush Motor (DRIVE ASSY PRO)
IBT Brush Motor drives the brush in the Belt Cleaner.
IBT Cleaner Retract Motor (DRIVE ASSY PRO)
The IBT Cleaner Retract Motor drives the cam to make the Belt Cleaner to contact
with the IBT Belt.
SENSOR IBT RETRACT
The SENSOR IBT RETRACT detects the position of the cam for retracting the
Belt Cleaner.
MOT ASSY P/R
MOT ASSY P/R drives the Drum. The Motor is connected to the Drum via a
coupling.
SENSOR TR-0
Sensor TR-0 detects the position of the Belt by reading the silver sticker on the
Belt surface outside the toner image formation area.
OPERATING PRINCIPLES
SENSOR ASSY ADC
SENSOR ASSY ADC reads the toner patch densities on the Belt immediately
before secondary transfer, and converts the read densities to voltage values. These
voltage value are used for controlling toner density.
SENSOR HUM & TEMP
SENSOR HUM & TEMP detects the temperature and humidity inside the printer,
and converts these to voltage values. These voltage value are used for controlling
toner density.
SENSOR IBT RETRACT
Belt
Drum Cleaner
SENSOR HUM & TEMP
SENSOR ASSY ADC
Figure 2-44. Main Functional Components of Photoconductor Unit
Xerographic
Cleaning Sheet
Cleaner Brush Cleaning Roll
1ST BTR
SENSOR TNER FULL
Drum
Revision B
ANTENNA ASSY
IBT Cleaner
Retract Motor
IBT Brush Motor
SENSOR TR-0
MOT ASSY P/R
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