Epson DFX-9000
Revision B
Operating Principles
Circuit operation
78
2.3.1 ROM board
The ROM board is a main controller of this printer and is divided into
the following two circuits:
Logic Control circuit
Mechanism Control circuit
2.3.1.1 Logic control circuits
The Logic Control circuit controls the following functions.
I/O control (all I/F ports)
Memory management
Print data processing
Figure 2-22. Circuit Block Diagram
+3.3 V
XPST42V
Power Unit
OP Board
(LCD/LED/SW)
SoC ASIC
D-RAM
(16MB)
Head Driver
Motor Driver
Motor
Safety Circuit
Head
Safety Circuit
3.3 V
Regulator
3.3 V
Protect
Circuit
Reset
Circuit
Flash Memory
(4MB)
FRAM
(4K)
Parallel Interface
Serial Interface
USB Interface
Type-B Interface
+42 V
ASIC
+37 V
+5 V
Print Head
Printer
Mechanism
Mechanical
Controller
Controller
ROM
Board
Each
Motor
Each
Sensor
Summary of Contents for DFX-9000
Page 1: ...EPSONDFX 9000 Serial Impact Dot Matrix Printer SEDM04003 SERVICE MANUAL ...
Page 8: ...C H A P T E R 1 PRODUCT DESCRIPTION ...
Page 61: ...Epson DFX 9000 Revision B Product Description Dimensions and weight 54 ...
Page 62: ...C H A P T E R 2 OPERATING PRINCIPLES ...
Page 99: ...Epson DFX 9000 Revision B Operating Principles Circuit operation 92 ...
Page 100: ...C H A P T E R 3 TROUBLESHOOTING ...
Page 104: ...Epson DFX 9000 Revision B Troubleshooting Overview 97 Mechanism initialization e e e e e ...
Page 107: ...Epson DFX 9000 Revision B Troubleshooting Overview 100 PAPER FEEDING FF APG APPROACH ...
Page 130: ...C H A P T E R 4 DISASSEMBLY AND ASSEMBLY ...
Page 218: ...C H A P T E R 5 ADJUSTMENT ...
Page 263: ...Epson DFX 9000 Revision B Adjustment Additional functions 256 ...
Page 264: ...C H A P T E R 6 MAINTENANCE ...
Page 286: ...C H A P T E R 7 APPENDIX ...
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Page 324: ...EPSON DFX 9000 Revision B Appendix Component Layout 317 7 4 Component Layout ...
Page 333: ...EPSON DFX 9000 Revision B Appendix Parts list 326 ...