Epson STYLUS PRO 9400 - Print Mechanism (Print Head)

EPSON Stylus Pro 7400/7800/9400/9800 Revision B
Operating Principles Print Mechanism Components 150
2.2.1 Print Mechanism (Print Head)
Stylus Pro 7400/7800/9400/9800 employ a single print head which incorporates both
functions for black and color as the previous model; Stylus Pro 7600/9600.
The print head incorporates a thermistor. According to the temperature around the head
detected by the thermistor, the CPU on the Main Board controls the ink discharge
speed and the amount of ink to be discharged.
 Printing method: On-demand ink-jet
 Nozzle configuration:
180 nozzles x 8 rows = 1440 nozzles (See Figure 2-1)
 Black: Stylus Pro 7800/9800 (8-color model): 540 nozzles
(180 nozzles for each of Black1, Black2, and Black3)
Stylus Pro 7400/9400 (4-color model): 360 nozzles
(180 nozzles for each of Black1 and Black2)
 Color: Stylus Pro 7800/9800 (8-color model): 900 nozzles
(180 nozzles for each of cyan, magenta, light cyan, light
magenta and yellow)
Stylus Pro 7400/9400 (4-color model): 1080 nozzles
(180 nozzles for each of cyan1, cyan2, magenta1, magenta2,
yellow1, and yellow2)
 Nozzle pitch: 0.141mm (1/180 inch) for each color
Figure 2-1. Nozzle Arrangement
 Drive waveform:
The following table shows the outline of the waveforms of the six print modes.
Table 2-2. Relationship between Nozzle Rows and Colors
Nozzle Row 8-Color Mode 4-Color Mode
A Light gray Matte black
B Light magenta Matte black
C Light cyan Magenta
D Gray Magenta
E Photo black/Matte black Cyan
F Cyan Cyan
GMagenta Yellow
H Yellow Yellow
Table 2-3. Printing Modes (Drive Waveforms)
Waveform Name Drive Frequency Print Resolution CR Speed
VSD1
11.52 KHz
± 7%
H360 x V360
H360 x V720
H720 x V360
320 CPS
VSD1d
11.52 KHz ± 7%
H360 x V360
H360 x V720
H720 x V360
320 CPS
VSD2
8.64 KHz ± 7%
H720 x V360
H720 x V720
240 CPS
VSD2d
8.64 KHz ± 7%
H720 x V360
H720 x V720
240 CPS
VSD3
8.64 KHz
± 7%
H720 x V720
H1440 x V720
240 CPS
VSD3_HR
8.64 KHz ± 7% H2880 x V1440 240 CPS
A#180
A#179
A#178
B#180
B#179
B#178
C#180
C#179
C#178
D#180
D#179
D#178
E#180
E#179
E#178
F#180
F#179
F#178
G#180
G#179
G#178
H#180
H#179
H#178
A#3
A#2
A#1
B#3
B#2
B#1
C#3
C#2
C#1
D#3
D#2
D#1
E#3
E#2
E#1
F#3
F#2
F#1
G#3
G#2
G#1
H#3
H#2
H#1
41.66mm
31.89mm
0.041mm
1/180inch
0.071mm
1/360inch
7.620mm
216/720inch
7.620mm
216/720inch
7.620mm
216/720inch
2.258mm
64/720inch
2.258mm
64/720inch
2.258mm
64/720inch
2.258mm
64/720inch
Carriage Moving Direction
Paper Feed Direction