Epson Stylus CX3700 Service Manual page 42

EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850
For your reference, the top or the end of a paper is usually detected with the PE Sensor.
In case that the PE Sensor cannot detect the top of a paper in the paper loading
sequence, the printer indicates the "Paper Out error". If the PE Sensor cannot detect the
end of a paper in the paper feeding sequence, the printer indicates the "Paper Jam
error". As for the details, refer to Chapter 3 "Troubleshooting".
OPERATING PRINCIPLES
2.2.4.1 Paper Loading Mechanism
The Paper loading mechanism consists of the Change Lever in the Pump Unit, the
Holder Shaft Unit (including the Clutch mechanism) and the ASF Unit.
The Change Lever and the Clutch mechanism play a major role in the Paper loading
mechanism as follows.
1. ASF home position detection function
The ASF Unit on this printer does not have the ASF Home Position Sensor.
Instead of the ASF Home Position Sensor, the Change Lever and the Clutch
mechanism is used to detect the ASF home position.
When the Change Lever is set on the Clutch mechanism with the counterclockwise
rotation of the PF Motor pinion gear, the ASF home position is detected by this
lever for the paper loading operation. In this time, the printer cannot load a paper
from ASF Unit because the drive of the PF Motor is not transmitted to the LD
Roller Shaft.
2. Paper loading function
When the Change Lever is released from the Clutch mechanism with the
clockwise rotation of the PF Motor pinion gear, the ASF home position detection
function is changed over to the paper loading function. Therefore, the printer can
load a paper from ASF Unit because the drive of the PF Motor is transmitted to LD
Roller Shaft.
During paper loading, paper is transported from the ASF Unit into the printer by the
rotation of the 2 cams of the LD Roller.
Cam (Large) : Hopper release
Cam (Small) : Paper Back Lever release
When 1 page paper is loaded, the cams mentioned above prepare the Hopper and Paper
Back Lever for the next paper loading operation, and the remaining paper is returned to
the standby position.
Figure 2-7 (p.43) and Figure 2-8 (p.44)
the operation of each mechanism.
Printer Mechanism
Revision A
show you the ASF paper loading sequence and
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