Paper Transportation - Epson ColorPage EPL-C8200 Service Manual

EPSON ColorPage EPL-C8200

2.5.4 Paper Transportation

1. Main P/H Assembly
The Main P/H Assembly consists of the following components:

Pre-Registration Roll Assembly

Registration Clutch

Pre-Registration Clutch

Registration Brake Clutch

Registration Sensor

Front OHP Sensor

Rear OHP Sensor

Registration Brake Clutch

Registration Metal Roll

Registration Rubber Roll
(a) The Registration Metal Roll and Registration Rubber Roll pull
out the paper in synchronization with the IBT Belt Assembly
timing so that the paper will be positioned properly for the
complete toner image on the IBT Belt Assembly to be correctly
transferred onto the paper.
(b) Pre-Registration Roll Assembly transfers paper from the paper
tray or the MSI Assembly onto the Registration Metal Roll and
Registration Rubber Roll. Until the top of the paper reaches the
Registration Metal Roll and Registration Rubber Roll and until
those rolls start rotating, the Pre-Registration Roll Assembly
keep transferring the rear part of the paper by making a paper
loop and correcting the skew at the top of the paper.
(c) The Registration Brake Clutch controls (applies the brake to) the
Registration Metal Roll.
When the top of the paper reaches the Registration Metal Roll
and Registration Rubber Roll it forms a loop. However, hard
Chapter 2 Operating Principles
paper (such as an OHP sheet) may go through the Registration
Metal Roll and the Registration Rubber Roll without making a
loop. By turning on the Registration Brake Clutch, the
Registration Metal Roll and the Registration Rubber Roll are
constricted and the paper cannot go through—and that causes a
paper loop.
(d) The Registration Clutch transmits the driving force from the P/H
Motor Assembly to the Registration Metal Roll and Registration
Rubber Roll so that the paper and the IBT Belt Assembly are
properly positioned for a secondary image transfer.
(e) The Pre-Registration Clutch transmits the driving force from the
P/H Motor Assembly to the Pre-Registration Roll Assembly.
(f) The Registration Sensor detects when the top of the paper has
reached the Registration Metal Roll and the Registration Rubber
Roll. To determine the paper size, the system detects the
bottom edge of the paper. (The paper size is determined by the
system keeping track of the time from when the Registration
Clutch is turned on to when the Registration Sensor detects no
paper.)
(g) The printer detects the front and back of an OHP sheet* from the
combined results of the Front OHP Sensor and the Rear OHP
Sensor. (For more details, see "7.3 OHP Side Detection Control"
in Section 10.)
*The printer can use EPSON Color Laser Transparencies
(S041175, S041174) only.
(h) The resistor and the capacitor installed on the front of the Main
P/H Assembly maintain the potential of the Registration Metal
Roll at the time of image transfer. If the Registration Metal Roll is
directly grounded, the potential of the paper escapes to the
ground via the Registration Metal Roll. This means that the
paper will not have enough potential for an image to be
transferred correctly.
Revision A
2-26