Epson DFX-9000 - ROM Board

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 DriverMotor 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