EPSON Stylus Color 440/640/740
2.2.4.1 Reset Circuits
[C206 Main-B, C255 Main for Stylus Color 440]
The reset circuit prevents the CPU from running away, which is caused
by the unstable voltage in the logic line during the power ON/OFF
operation. And reset IC(IC9) monitors level of power voltage at the over
loading or malfunction on the circuit and manages the printer to operate
normally, keeping the damage to the printer minimum during the
abnormal situations. On the C206 main-B and C255 main board.
Chapter 2
Operating Principles
PST592D
(IC8)
1
Vout
2
NRES
3
Vcc
4
GND
C47
Not mounted
TMP95C061
16
(IC1)
P85
15
30
P84
/RESET
10
/NMI
+42V
M62030
NC8
(IC9)
R10
VCC
2
OUT
IN
NC5
4
GND
R6
Figure 2-20. Reset Circuit for Stylus Color 440
Revision A
+5V
+5V
R1
R138
E05B44
(IC2)
174
/RESET
+5V
8
7
6
5
66