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Printer Features
C094 MAIN Board Assembly (Main Control Circuit Board)
Basically, the same board layout is used in both the
136~column
model and the
80-
column model.
The CPU on this board controls all the main functions of the printer.
It consists of a
TMP90C041F
8-bit
CPU, an
E05A55YA
gate array, an
E2PROM,
a
PSRAM, a MASK ROM, motor drivers, and head drive transistors.
PF MOTOR
DRIVER
CPU
,,DAld-lfil-l
TM,p,),
CTRr”.“’
CR MOTOR
E2PROM
1”
o”-+q
/
I;
;
MASK ROM
HEAD DRIVE
GAiE
ARRAY
TRANSISTORS
E05A66YA
Figure
1-12.
CO94
MAIN
Board
Assembly
(Main
Control
Circuit
Board)
I/F
Epson
FX-870/1170
1-29