Printhead Operation - Epson Stylus COLOR 900 Service Manual

EPSON Stylus COLOR 900/900N
2.2.1.3 Ink Cartridge Sensors
The carriage unit is equipped with two sensors (micro switches) for
detecting the presence of the color and black ink cartridges. The printer
cannot operate unless both cartridges are installed and the ink cartridge
clamps are securely closed.
2.2.1.4 Carriage Motor Specifications
The table below shows the CR motor specifications.
Table 2-3. CR Motor Specifications
No. Item
1 Motor Type 4-phase / 200-pole / HB-type stepping motor
2 Drive voltage 42 VDC
Ω
3 Coil resistance 5.8
4 Drive mode Bipolar constant current drive
Specifications
±
5% (Applied to the driver)
±
10%

2.2.2 Printhead Operation

The printhead of the EPSON Stylus COLOR 900/900N is not
compatible with any other printer. Its basic features and operation are
described below.
2.2.2.1 Nozzle Configuration
The printhead includes 480 nozzles, divided into five rows of 96 nozzles
each. As shown in the figure below, the black nozzles are vertically
spaced at 360 dpi and the color nozzles at 180 dpi. In color printing,
only row "B" among the two black nozzle rows is used.
# 9 6
3 6 0 d p i
# 9 6
# 9 5
1 8 0 d p i
# 9 5
# 9 4
# 9 4
# 9 3
# 9 3
# 3
# 3
# 2
# 2
# 1
# 1
R o w A ( B l a c k 1 )
R o w B ( B l a c k 2 )
Figure 2-1. Nozzle Configuration
Chapter 2 Operating Principles
# 9 6
# 9 6
# 9 5
# 9 5
# 9 4
# 9 4
# 9 3 # 9 3
# 3
# 3
# 2
# 2
# 1
# 1
R o w C ( M a g e n t a )
R o w E ( Y e l l o w )
R o w D ( C y a n )
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