Outline Of Control Circuit Board; Major Elements; C593 Main Board – Circuit Block Diagram - Epson Stylus Pro 4400 Service Manual

EPSON Stylus Pro 4400/4450/4800/4880/4880C

2.3 Outline of Control Circuit Board

This section describes the operation of BOARD ASSY., MAIN, which controls
and drives the Printer Mechanism of Stylus Pro 4400/4450/4800/4880/4880C.
C593 MAIN Board: Stylus Pro 4400/4800
CA00 MAIN Board: Stylus Pro 4450/4880/4880C
NOTE: For circuit board details, refer to "Chapter 7:
at the end of this volume.
Explanation of major elements
Table 2-14. Major Elements
Model No. Location
SDRAM IC2/23
Flash ROM IC12
SH-3 IC15
SH-7709S
E09A54RA IC17/18
RTC9824SA IC16
E05C25BB IC19
TSB43AA82A IC4
Operating Principles
Appendix (p.457)
Function
System memory 64MB (256Mbit x 2)
Flash Memory 2MB (1Mbit x 16bit)
• For storage of control program
(firmware)
• Saving of various setting parameters
and control information
32bit RISC-CPU
• Operational frequency: Internal 96MHz
External 48MHz
Custom ASIC
• Head drive voltage waveform generation
control
Real-Time Clock
• Sets year/month/day by F/W
• MAIN PCB reset signal formation
Custom ASIC
1. Print data processing
• Rasterizer
• Head drive control
2. Mechanism control
(motors and solenoids)
3. Sensor control
ASIC
• IEEE1394-I/F control
Outline of Control Circuit Board
Table 2-14. Major Elements
Model No. Location
A3958SLBTR-T IC5
A3958SLBTR IC6
AA6628SEDTR-T IC7
(IC15)
(IC12) (IC2) (IC23)
Real-Time Clock
BAT1
RTC9824SA
(IC16)
Lithium battery
Custom ASIC
E09A54RA
(IC17)
Head FFC
Custom ASIC
E09A54RA
(IC18)
Figure 2-62. C593 MAIN Board – Circuit Block Diagram
Revision C
Function
CR Motor driver
• PWM current control method
PF Motor driver
• PWM current control method
• ASF/Pump Motor driver
• PG/PO Motor driver
CR motor driver
A3958SLBTR-T
(IC5)
CR motor
PF motor driver
A3958SLBTR
(IC6)
PF motor
ASF/pump motor
Custom
PG/PO motor ASF/pump
ASIC
driver
motor
E05C25BB
(IC19) A6628SEDTR-T
(IC7)
PG/PO motor
ASIC
TSB43AA82A
(IC4)
152