EPSON Stylus Pro 7400/7800/9400/9800
Revision B
Operating Principles
Print Mechanism Components
160
2.2.3 Paper Feed Assembly
This printer uses friction feed to carry out highly precise feeding of roll paper and cut
sheets, and comprises a unique paper feed mechanism.
The paper feed mechanism unit is configured from a grid roller (one piece
construction), and pressurizing and follower roller assemblies mounted on the back of
the CR guide rail opposite the front surface.
Figure 2-10. Paper Feed Assembly
PF motor
The PF motor is a DC motor. The slit of the loop scale mounted on the Grid Roller
is read by the PF_ENC sensor and the output pulse is fed back to control the
motor. This feedback control ensures high printing accuracy.
The PF motor drive is transmitted to the grid roller via the PF timing belt and the
reduction pulley.
Figure 2-11. Paper Feed Mechanical Unit PF Rail Unit
Secondary Roller Assembly
Grid Roller
PF Motor
R = P THICK1 Sensor
L = P THICK2 Sensor
Paper Set Lever
Secondary Roller Assembly
CR Guide Rail
Reduction
Pulley
PF Motor
Center Frame
Grid Roller
Platen
Sub Platen
Paper
Paper Guide L1, L2
Summary of Contents for Stylus Pro 7400
Page 1: ...EPSONStylusPro7400 7800 9400 9800 Large Format Color Inkjet Printer SERVICE MANUAL SEIJ05002 ...
Page 10: ...C H A P T E R 1 PRODUCTDESCRIPTION ...
Page 147: ...C H A P T E R 2 OPERATINGPRINCIPLES ...
Page 170: ...C H A P T E R 3 TROUBLESHOOTING ...
Page 207: ...C H A P T E R 4 DISASSEMBLY ASSEMBLY ...
Page 292: ...C H A P T E R 5 ADJUSTMENT ...
Page 373: ...C H A P T E R 6 MAINTENANCE ...
Page 380: ...C H A P T E R 7 APPENDIX ...
Page 385: ...Model PX 7500 7500S 9500 9500S Board C594 Main Sheet 1 of 4 Revison G ...
Page 386: ...Model PX 7500 7500S 9500 9500S Board C594 Main Sheet 2 of 4 Revison F ...
Page 387: ...Model PX 7500 7500S 9500 9500S Board C594 Main Sheet 3 of 4 Revison F ...
Page 388: ...Model PX 7500 7500S 9500 9500S Board C594 Main Sheet 4 of 4 Revison E ...
Page 389: ...Model PX 7500 7500S 9500 9500S Board C594 SUB Sheet 1 Revison C ...
Page 390: ...Model PX 7500 7500S 9500 9500S Board C594 SUB B Sheet 1 Revison E ...
Page 391: ...Model PX 7500 7500S 9500 9500S Board C594 SUB C Sheet 1 Revison D ...
Page 392: ...Model PX 7500 7500S 9500 9500S Board C594 PNL Sheet 1 Revison D ...
Page 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 ...
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Page 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 ...
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