Epson Stylus Pro 9000 - Summary of Control Circuit Operations

EPSON Stylus Pro 9000 Revision B
Operating Principles Summary of Control Circuit Operations 51
2.4 Summary of Control Circuit Operations
This section summarizes the functions of the (C277MAIN) Main Board and the
controls used to operate the printer.
Figure 2-18. C277MAIN Board-Circuit Block Diagram
IC8
CPU/C90A08CA
(SH7043)
CN7
Control Panel
IC13
ASIC/E05B61AA
CN2
Type-B Slot
CN3
Mac Serial I/F
CN1
Parallel I/F
IC39
SRAM/8KB
IC18/19
DRAM/2MB
CN19
RAM-SIMM/16MB
IC1/2
Flash mem./1MB
Fixed
-Firmware
-Setting parameters
CN20
PC Card connector
IC32
ASIC/uPD65802
IC20
ASIC/TE7751
IC37
DAC/M65530FP
IC33
Head-drive voltage
common driver
Printheads (B/C)
CR
Motor
PF
Motor
PG
Motor
Pump
Motor
Printer
mechanism
Motor
drivers
B head C head
Head-drive wave
generation
Head data & control signals
IC35
IC30
IC31
Table 2-4. C277MAIN Board Main Components
Name/Code Location Function
CPU (C90A08CA)
SH7043
IC8
32 bit RISC-CPU
o Clock speed = 33MHz
o 128KB PROM internal
ASIC (E05B61AA) IC13
1) Regulates print data
o Command handling
o Rasterizer (image data handling)
o Head drive regulation (DAC)
o Print timing regulation
2) Memory (DRAM/SRAM)
3) I/F Circuit Control
o Parallel interface (IEEE1284)
o Macintosh Serial interface
o Type-B
ASIC (TE7751) IC20
Regulates Motor
o Pump Motor
o PG Motor (PG setting)
o Fan (PS, Paper Suction)
ASIC (uPD65802) IC32
Regulates motor (PWM regulation)
o CR Motor
o PF Motor
DAC (M65530FP) IC37
3 channel 10 bit DA converter
o head-drive voltage control
Flash Memory
(MBM29F400TC)
IC1/2
Flash Memory (1Mbyte)
o Save firmware
o Register setting parameters
DRAM (EDO) IC18/19
EDO RAM
o 2Mbyte
o 16Mbtye (CN19 mounted SIMM)
SRAM (LC3564SM-
10)
IC39
64Kbit SRAM
o External data ring buffer type
Driver IC (L6203) IC33/35 CR/PF Motor Driver
Driver IC (LB1845) IC30/31 PG/Pump Motor Driver