EPSON Stylus Photo 750 Revision A
Operating Principles Operating Principles of Electric Circuit 35
2.2.2.4 Timer Circuit
The timer of this printer uses reset/timer IC(IC8). The timer keeps
record of how long the printer is OFF and uses it information to judge it
the initial cleaning should be performed or not when the power it turned
ON next time. The data in the IC is backed up by the lithium battery.
2.2.2.5 EEPROM Control Circuit
This printer uses non-volatile memory EEPROM(IC7). When turning the
power ON, EEPROM outputs data to the gate array(IC2) and records
the data when turning the power OFF. The data which EEPROM will
record are followings;
„ Ink Consumption Counter (black/color)
„ Frequency of Cleaning
„ Destination Data
„ CPSI Pass Word
„ Other various setting values
Figure 2-7. EEPROM Control Circuit
2.2.2.6 Head Drive Circuit
Head drive circuit of this printer consists of the following circuits.
† Driven voltage wave form circuit
This circuit consists of HIC(IC14) and terminal transistor, and
generates drive wave which will be charged to each PZT.
Figure 2-8. Common Drive Circuit
+5V
8
6
5
AT93C46
(IC7)
Vcc
GND
ORG
E05B58**
(IC2)
206
205
204
203
1
2
3
4
CS
SK
DI
DO
EECS
EECK
EECO
EECI
op07
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