Secondary Transfer (Belt-Paper) - Epson AcuLaser CX11 Service Manual

EPSON AcuLaser CX11/CX11F
SECONDARY TRANSFER (BELT→PAPER)
At the "Secondary transfer" process, the complete toner image formed on the Belt
surface is transferred to paper by the 2nd BTR (Second Bias Transfer Roll).
The 2nd BTR comes in contact with the Belt only when transferring the image to
paper to prevent the toner image formed on the Belt surface from being destroyed.
Normally, the 2nd BTR is located at its home position where is detected by the 2nd
BTR Retract Sensor. And the 2nd BTR Retract Motor moves the 2nd BTR to
contact with the paper.
The 2nd BTR is a conductive roller. It contacts with the back side of the paper (the
opposite side of the side to be printed), and charged positively by the HVPS.
The Back Up Roll, located on the opposite side of the Belt from the 2nd BTR, is a
conductive roller and earthed to the Frame ground.
By positively charging the back side of the paper by the 2nd BTR, the negatively
charged toner image on the Belt is attracted to the paper and the image appears on
the paper.
SENSOR 2BTR RETRACT
Figure 2-16. Secondary transfer (Belt
OPERATING PRINCIPLES
2ND BTR ASSY MOT ASSY MICRO
→
Paper) (1)
Printer Section Operating Principle
Figure 2-17. Secondary transfer (Belt
Revision B
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Paper) (2)
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