Epson FX 1170 Service Manual - Page 38

MAIN Main Control Circuit Board, r - printer driver

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q.6.I BOARD ASSEMBLY, C094 MAIN (Main Control Circuit Board) REV.-A 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 LPAI 476H CPU TM P90C041F CENTRONICS l/F CR MOTOR o ~~~f~4M ~ ~> E2PROM 7 \ n \ Ill \' " q " *PS RAM 1 Cl"lp E ~ o0 Q ~- I +7 "MASK I 4;~- 'OM HEAD DRIVE CN2 for OPTION IF TRANSISTOR . . o 0 T /" ' GATE ARRAY E05A66YA PF MOTOR DRIVER pPA1476H CPU TM P90C041F CENTRONICS l/F CR MOTOR \//r g;!f;24M r~ \ ;--o'"-y qE2pR0M ,0 (0 0ml0 ,PS RAM E I MASK ROM 0: n: ~~ 0' CN2 for OPTION l/F ? o r ~ r '- ~0 "- HEAD DRIVE GATE ARRAY TRANSISTOR E05A66YA c80-column model> Figure 1-12. BOARD ASSEMBLY, C094 MAIN (Main Control Circuit B-d 1-29

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REV.-A
q.6.I
BOARD
ASSEMBLY,
C094
MAIN (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
LPAI
476H
TM
P90C041F
CENTRONICS
l/F
\’
“
“
o
7
q
Cl”lp
~
E
~—
CR MOTOR
~~~f~4M
~
\
\
4
~>
n
Ill
1
*PS
RAM
o
0
,,,,,
Q=
/
I
+7
”MASK
‘
OM
— —
——
T
/
“
‘
;~-
HEAD DRIVE
I
TRANSISTOR
.
.
CN2
for OPTION
o
0
GATE ARRAY
E05A66YA
<136-column model>
PF MOTOR
E2PROM
DRIVER
CPU
TM
P90C041F
CENTRONICS
l/F
pPA1476H
\//
-
r
CR MOTOR
r~;--o’”
–y
qE2pR0M
g;!f;24M
\
?r-
0
ml
E
,PS
RAM
,(0
00
I
r
‘~
“
-
MASK ROM
0:
n:
~~
0’
CN2
for OPTION
o
0
~
HEAD
DRIVE
GATE ARRAY
TRANSISTOR
E05A66YA
c80-column
model>
l/F
IF
Figure 1-12. BOARD ASSEMBLY,
C094
MAIN (Main Control
Circuit
B-d
1-29