Epson 3800 - Stylus Pro Color Inkjet Printer, Service Manual

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EPSON Stylus Pro 3800/3800C/3850 Revision A
OPERATING PRINCIPLES Print Mechanism 40
2.2 Print Mechanism
This section explains the basic specifications of the print head.
NOZZLE CONFIGURATION AND COLORS
This printer is equipped with an MACH print head, which employs 180 nozzles per
color. The printer ejects nine different colors of ink through the eight rows of nozzles.
One of the rows is shared by Photo Black and Matte Black inks.
The nozzle configuration as seen from behind the print head is shown below.
„
Printing method: On-demand ink-jet
„
Nozzle configuration: 180 nozzles x 8 rows = 1440 nozzles
Figure 2-4. Nozzle Configuration
DRIVE WAVEFORMS
The following four drive waveforms are used to create four print modes.
Paper
Fee
d Dire
ction
Carriage Moving Direction
Table 2-4. Nozzle Rows and Colors
Nozzle Row Color
A
Magenta
B Cyan
C
Photo Black Matt Black
D Yellow
E
Light Light Black
F
Light Black
G
Light Cyan
H
Light Magenta
Table 2-5. Print Modes (Drive Waveforms)
Waveform
Name
Drive Frequency
(kHz)
Print Resolution
(dpi)
CR Speed
(cps)
VSD1 10.08 360 x 360 280
VSD1 10.08
720 x 360
720 x 720
280
VSD2 10.08 1440 x 720 280
VSD3 20.16 2880 x 1440 280