Rom Board - Epson DFX-9000 Service Manual

Epson DFX-9000

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
Operating Principles
Power Unit
3.3 V
Regulator
+3.3 V
XPST42V
Motor Driver
Each Each
Sensor Motor
Figure 2-22. Circuit Block Diagram
Circuit operation
Parallel Interface
Serial Interface
USB Interface
Type-B Interface
3.3 V
Reset
Protect
Circuit
Circuit
SoC ASIC
Controller
D-RAM FRAM
(16MB) (4K)
Flash Memory
(4MB)
Mechanical
Controller
ASIC
Motor Head
Head Driver
Safety Circuit Safety Circuit
Print Head
Revision B
OP Board
(LCD/LED/SW)
ROM
Board
Printer
Mechanism
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