Epson Stylus Color 740 Service Manual

EPSON Stylus COLOR 440, 640, and 740 Chapter 2 Operating Principles
60
Figure 2-31. Sensor Circuit for Stylus COLOR 740
Printhead Driver
The printhead control circuit has the followin
g
features:

Hi
g
h-speed drive: the common volta
g
e drive circuit runs at 14.4
KHz.

Sli
g
ht vibration mode: this is added durin
g
carria
g
e acceleration
to eliminate trapped air bubbles.

Normal Dot and Dual Firin
g
(
also called Normal-Dot-2Dot
)
:
these modes can be selected b
y
the user from the driver
software.
The printhead control circuit is divided into two parts: the common
volta
g
e drive, which supplies power to the printhead as a whole, and the
nozzle selector drive, which determines the individual PZTs to which the
power is applied.
IC 2
E05B 588
+5V
+5V
CN4
CN5
CN6
ASF
HP
PE
PE
GND
PEV
HP
GND
HPV
ASF
GND
ASFV
+5V
+5V
+5V
+5V
+5V
+5V
+5V
97
SW A0
98
SW A1
99
SW A2

Epson Stylus Color 740 Specifications

General

Brand	Epson
Model	Stylus Color 740
Category	Printer
Language	English