EPSON Stylus Pro 7400/7800/9400/9800
Revision B
Operating Principles
Print Mechanism Components
162
The sensors used in the paper feeding mechanism are explained below.
P REAR sensor
This is a photo-reflective sensor located on the backside of the H Top Cover. It
detects paper absence by detecting the rear edge of the paper, and detects the
leading edge of paper when the paper is loaded to let the printer start the paper
setting operation such as attracting the paper to the paper guides.
Paper set lever, paper thickness detection (P THICK1, P THICK2)
P THICK1 Sensor: A transmissive photosensor located on the right side.
P THICK2 Sensor: A transmissive photosensor located on the left side.
In the paper feeding mechanism, there is a point where paper thickness threshold is
set to 0.3 to 0.4 mm (P THICK2 sensor) and a point where that is set to 0.6 to 0.7
mm (P THICK1 sensor). When the Paper Set Lever is set on those points, the two
sensors start to operate.
The paper thickness detection range for moving the Paper Set Lever is 0.34 to 2.05
mm (design value). By a combination of the two sensors, the printer can determine
to reduce the pressure of the Paper Set Lever according to the paper thickness.
“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.
Figure 2-13. Paper Feed Assembly (P Rear Sensor)
Table 2-5. Modes
Paper Thickness
Shield Plate
Sensor Output
P THICK2
P THICK1
P THICK2
P THICK1
Below 0.3 mm
Absent (Open)
Absent (Open)
L
L
0.4mm to 0.6mm
Present (Closed)
Absent (Open)
H
L
0.7mm to 2.0mm
Present (Closed)
Present (Closed)
H
H
Pressure release (Hi-Up)
Absent (Open)
Present (Closed)
L
H
Connector not connected
---
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H
H
P Rear Sensor
Содержание Stylus Pro 7400
Страница 1: ...EPSONStylusPro7400 7800 9400 9800 Large Format Color Inkjet Printer SERVICE MANUAL SEIJ05002 ...
Страница 10: ...C H A P T E R 1 PRODUCTDESCRIPTION ...
Страница 147: ...C H A P T E R 2 OPERATINGPRINCIPLES ...
Страница 170: ...C H A P T E R 3 TROUBLESHOOTING ...
Страница 207: ...C H A P T E R 4 DISASSEMBLY ASSEMBLY ...
Страница 292: ...C H A P T E R 5 ADJUSTMENT ...
Страница 373: ...C H A P T E R 6 MAINTENANCE ...
Страница 380: ...C H A P T E R 7 APPENDIX ...
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Страница 389: ...Model PX 7500 7500S 9500 9500S Board C594 SUB Sheet 1 Revison C ...
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Страница 392: ...Model PX 7500 7500S 9500 9500S Board C594 PNL Sheet 1 Revison D ...
Страница 395: ...PX 7500 7500S E PS ON S TYLUS PR O 7400 7800 No 02 R ev 01 C594 CAS E 021 152 150 152 152 152 151 ...
Страница 396: ...PX 7500 7500S E PS ON S TYLUS PR O 7400 7800 No 03 R ev 01 C594 E LE C 011 202 201 200 ...
Страница 397: ...PX 7500 7500S E PS ON S TYLUS PR O 7400 7800 No 04 R ev 01 C594 E LE C 021 203 204 ...
Страница 398: ...PX 7500 7500S E PS ON S TYLUS PR O 7400 7800 No 05 R ev 01 C594 POWE 011 300 301 302 ...
Страница 403: ...PX 7500 7500S E PS ON S TYLUS PR O 7400 7800 No 10 R ev 01 C594 ME CH 051 700 701 X15 700 ...
Страница 407: ...900 901 906 901 905 903 903 904 PX 7500 7500S E PS ON S TYLUS PR O 7400 7800 No 14 R ev 01 C594 ME CH 091 902 ...
Страница 409: ...PX 9500 9500S E PS ON S TYLUS PR O 9400 9800 No 02 R ev 01 C595 CAS E 021 150 151 152 152 152 152 ...
Страница 410: ...R ev 01 C595 E LE C 011 200 201 202 PX 9500 9500S E PS ON S TYLUS PR O 9400 9800 No 03 ...
Страница 411: ...PX 9500 9500S E PS ON S TYLUS PR O 9400 9800 No 04 R ev 01 C595 E LE C 021 204 203 ...
Страница 412: ...PX 9500 9500S E PS ON S TYLUS PR O 9400 9800 No 05 R ev 01 C595 POWE 011 300 302 301 ...
Страница 417: ...PX 9500 9500S E PS ON S TYLUS PR O 9400 9800 No 10 R ev 01 C594 ME CH 051 701 X15 700 700 ...
Страница 421: ...900 901 906 901 905 903 903 904 PX 9500 9500S E PS ON S TYLUS PR O 9400 9800 No 14 R ev 01 C595 ME CH 091 902 ...