Epson Stylus Color 740 Service Manual

EPSON Stylus COLOR 440, 640, and 740 Chapter 1 Product Description
32
1.8.4 C257 MAIN Board (Stylus COLOR 740)
The C257 MAIN board controls the operation of the printer mechanism
and data processin
g
operations for the St
y
lus COLOR 640. It consists
of the followin
g
ma
j
or components.
Figure 1-14. C257 MAIN Board
1.8.5 Power Supply Board
C206 PSB/PSE (Stylus COLOR 440 and 640)
C257 PSB/PSE (Stylus COLOR 740)
The power suppl
y
boards for the St
y
lus COLOR 440, 640 and 740
emplo
y
a switchin
g
re
g
ulator method to suppl
y
stable lo
g
ic and power
volta
g
es. Because these boards contain a time dela
y
circuit, electricit
y
can be supplied to the printer for at least 30 seconds after power is
turned off. Therefore, even when the user makes a mistake
(
for
example, turns off power in the middle of a print
j
ob
)
, this mechanism
ensures that the printhead is capped and prevents ink from clo
gg
in
g
the
nozzle plate.
Figure 1-15. C206/C257 PSB/PSE board
HT1
CN9
CN7
IC 14(H ead)
CN8
IC11(CR)
IC 1 2 IC 1 3
IC 2 (A s ic )
IC 1 (C P U )
IC 3 (P -R O M )
IC 6 (C G :o n ly fo r N L S P )
B a tt 1
CN1
CN3
CN2
IC 4 IC 5
(4M DRAM x2)
IC 7
(
EEPRO M
)
(P F D riv e )
IC 1 5
(R e g u la to r)
CN3
CN5
CN4
CN11
Fuse(F1)
Q1(FET)
Trans(T1)
C51
CN2
IC51
PC1
C11
Filter(L1)
CN1

Epson Stylus Color 740 Specifications

General

Brand	Epson
Model	Stylus Color 740
Category	Printer
Language	English