Epson Stylus Pro 7600 Service Manual page 114

EPSON Stylus Pro 7600/9600
Paper Suction Fans
The printer is equipped with suction fans in the lower space in the rear. The space
in the column direction behind Paper Guide L2 is divided into 2 compartments
(Stylus Pro 7600) or 3 compartments (Stylus Pro 9600), and one fan is mounted in
each compartment. By drawing air through multiple holes punched in Paper Guide
L2 in the back surface of the paper path and blowing it out through the rear of the
printer housing, suction is applied to the surfaces of Paper Guides L1 and L2 and
the paper is stabilized (prevented from flying up) as it passes through the printer.
The suction fans undergo air flow control (fan rotation duty control), which is
carried out by firmware control based on the printer's operating state (when paper
is set and during printing, etc.) and the type of paper used.
NOTE: Fans mounted
Stylus Pro 7600: 2 fans
Stylus Pro 9600: 3 fans
The following sensors aid in the paper feeding process.
P_REAR sensor
This sensor is attached to the Upper Paper Guide and is an optical (photo-
reflective) sensor. This sensor detects the rear edge of the paper and detects the
front edge when the paper is first loaded in the paper path. The position of this
sensor is stored in EEPROM.
Paper set lever, paper thickness detection (P_THICK, P_THICK_0.3)
P_THICK_0.3 Sensor:
P_THICK Sensor:
The mechanism is so designed that the threshold values for paper thickness are 0.3 ~
0.4 mm (P_THICK_0.3 sensor) and 0.8 ~ 0.9 mm (P_THICK sensor). The sensors
operate just when the pressure lever is brought down.
The designed detection values of the sensors for the UP and DOWN positions of the
pressure lever are 0.3 mm and 0.8 mm. The pressure lever in the UP position is
detected by a combination of both sensors.
"Thick paper state" occurs when the connections are open.
There is no error processing since this mechanism can not determine whether it has
broke down or not.
Since the mechanism is always in recognition of thick paper, printing on thin paper is
carry out with the platen gap kept large.
Operating Principles
Transmission type photosensor, left side.
Transmission type photosensor, right side.
Paper Thickness
Below 0.3 mm
0.3 mm to 0.8 mm incl.
0.81 mm or above
Connector not connected
Pressure release (Hi-Up)
Figure 2-13. Paper Feed Mechanical Unit (Stylus Pro 7600) 2/2
Print Mechanism Components
Table 2-5. Modes
Shield Plate
P_THICK_0.3 P_THICK P_THICK_0.3
Absent (Open) Absent (Open)
Present (Closed) Absent (Open)
Present (Closed) Present (Closed)
- -
- -
Paper suction fans
P-Rear sensor
Revision A
Sensor Output
P_THICK
L L
H L
H H
H H
L H
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