Control Circuit - Epson Stylus Pro 9000 - Print Engine Service Manual

EPSON Stylus Pro 9000

2.2.6 Control Circuit

This section summarizes the functions of the (C277MAIN) Main Board.
IC8
CPU/C90A08CA
(SH7043)
IC13
ASIC/E05B61AA
IC20
IC32
ASIC/TE7751
ASIC/uPD65802
Motor
IC30
IC33 IC35
drivers
Printer
CR PF PG
mechanism
Motor Motor Motor
Figure 2-16. C277MAIN Board-Circuit Block Diagram
Technical Overview
CN7
Control Panel
CN2
Type-B Slot
CN3
Mac Serial I/F
CN1
Parallel I/F
IC39
SRAM/8KB
IC18/19
DRAM/2MB
Fixed
CN19
RAM-SIMM/16MB
IC1/2
-Firmware
Flash mem./1MB
-Setting parameters
CN20
PC Card connector
Head-drive wave
generation
IC37
DAC/M65530FP
B head C head
IC31 Head-drive voltage
common driver
Pump
Printheads (B/C)
Motor
Table 2-7. C277MAIN Board Main Components
Name/Code Location
CPU (C90A08CA)
IC8
SH7043
ASIC (E05B61AA) IC13
ASIC (TE7751) IC20
ASIC (uPD65802) IC32
DAC (M65530FP) IC37
Flash Memory
IC1/2
(MBM29F400TC)
DRAM (EDO) IC18/19
SRAM (LC3564SM-
IC39
10)
Driver IC (L6203) IC33/35
Driver IC (LB1845) IC30/31
Function

32 bit RISC-CPU
Clock speed = 33MHz
128KB PROM internal

Regulates print data
Command handling
Rasterizer (image data handling)
Head drive regulation (DAC)
Print timing regulation

Memory (DRAM/SRAM)

I/F Circuit Control
Parallel interface (IEEE1284)
Macintosh Serial interface
Type-B

Regulates Motor
Pump Motor
PG Motor (PG setting)
Fan (PS, Paper Suction)

Regulates motor (PWM regulation)
CR Motor
PF Motor

3 channel 10 bit DA converter
head-drive voltage control

Flash Memory (1Mbyte)
Save firmware
Register setting parameters

EDO RAM
2Mbyte
16Mbtye (CN19 mounted SIMM)

64Kbit SRAM
External data ring buffer type
CR/PF Motor Driver
PG/Pump Motor Driver
37