Epson FX-870

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