Epson Stylus Pro 7400 - Outline of Power Supply Circuit Board

EPSON Stylus Pro 7400/7800/9400/9800 Revision B
Operating Principles Outline of Power Supply Circuit Board 167
2.3 Outline of Power Supply Circuit Board
This section describes the operation of C594 MAIN Board, which controls and drives
the printer mechanism of the printer.
NOTE: For details of each circuit, refer to Chapter 7.
 Explanation of major elements on C594 MAIN Board
Note "*": Stylus Pro 7400/7800: IC2/9 only (64MByte)
Stylus Pro 9400/9800: IC2/9 and IC7/10 (128MByte)
Figure 2-20. C594 MAIN Board Circuit Block Diagram
Table 2-8. Major Elements on C594 Main Board
Name/Code Location Function
SH-3
HD6417709S
IC14 32 bit RISC-CPU
• Drive clock frequency = 144 MHz
E05C25BB IC21 Custom ASIC
1. Print data processing
•Rasterizer
• Head drive control
2. Mechanism control (motors and solenoids)
3. Sensor control
4. USB2.0 I/F
E09A54RA IC17, 18 Custom ASIC
• Head drive voltage waveform generation
control
Flash Memory IC3 Flash Memory (16Mbit)
• For storage of control program (firmware)
• Saving of various setting parameters and
control information
SD-RAM IC2/9
IC7/10
System memory*
256mbit x 16
L6203 IC11 PF Motor Drivers IC
• PWM constant current drive control
A3958 IC4 CR Motor Drivers IC
• PWM constant current drive control
A6628 IC6 Pump Motor/Pressure Motor Drivers IC
CPU
SH-3
HD6417709S
(IC14)
Custom
ASIC
E05C25BB
(IC21)
Custom
ASIC
E09A54RA
(IC17,18)
IEEE1394 Controler
TSB43AA82APGE (IC16)
A6628 (IC6)
L6203 (IC11)
A3958 (IC14)
SDRAM
(IC2)
SDRAM
(IC9)
SDRAM
(IC7)
SDRAM
(IC10)
Flash Memory
(IC3)
CN15
Press Motor
CN16
Pump Motor
CN14
PF Motor
CN13
CR Motor
CN6
USB I/F 2.0
CN5
Type B I/F
CN7
IEEE 1394 I/F
CR_FFC
HEAD