Summary Of Control Circuit Operations - Epson Stylus Pro 9500 Service Manual

EPSON Stylus Pro 9500

2.1.2 Summary of Control Circuit Operations

This section summarizes the functions of the (C277MAIN) Main Board and the
controls used to operate the printer.
Motor
drivers
CR PF PG
Motor Motor Motor
Printer
mechanism
Figure 2-20. C277MAIN Board-Circuit Block Diagram
Operating Principles
CN7
Control Panel
Type-B Slot
Mac Serial I/F
Parallel I/F
Fixed
-Firmware
-Setting parameters
Flash mem./1MB
PC Card connector
Head-drive wave
generation
Head-drive 3voltage
common driver
Pump
Printheads (B/C)
Motor
Component List & Illustrations
Table 2-8. 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
Revision A
Function
32 bit RISC-CPU
o Clock speed = 33MHz
o 128KB PROM internal
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
Regulates Motor
o Pump Motor
o PG Motor (PG setting)
o Fan (PS, Paper Suction)
Regulates motor (PWM regulation)
o CR Motor
o PF Motor
3 channel 10 bit DA converter
o head-drive voltage control
Flash Memory (1Mbyte)
o Save firmware
o Register setting parameters
EDO RAM
o 2Mbyte
o 16Mbtye (CN19 mounted SIMM)
64Kbit SRAM
o External data ring buffer type
CR/PF Motor Driver
PG/Pump Motor Driver
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