EPSON Stylus Photo R1900/R2880/R2000/R2000s/SC-P400 Series Revision I
Adjustment Adjustment 156
Supplement: Regarding remaining ink amount
When the Ink Counter detects ink out, a certain amount (safety margin) of ink is
still remaining in the cartridge to prevent the print head from damages caused by
printing without ink. This safety margin is important especially for a printer that
discharges larger amount of ink.
The figure below illustrates the concept of this safety margin.
Figure 5-20. Concept of Remaining Ink Amount
Table 5-6.The Difference in Calibration Method between Head ID and
Colorimetric Calibration.
Conventional Head ID adjustment Colorimetric Calibration
In the print head manufacturing
process, ink discharge amount of each
head is actually measured to get
individual characteristic information.
The information is stored on the printer
as Head ID to control the print head.
By printing and measuring a color
chart, a variation from the standard
machine is obtained and registered as
the correction value (Color ID) to
control the amount of ink droplets.
Before performing Colorimetric Calibration, the conventional
Head ID must be pre-registered. This is because the Head ID
contains information to create a waveform to drive the head, which
is also required for the Colorimetric Calibration.
If you do not perform Colorimetric Calibration after performing
Head ID adjustment, the printer will be controlled only by the Head
ID, which affects the following.
Ink Counter
The ink consumption counter table switches from the table for
Color ID to the one for Head ID. This change causes an ink out
error to occur 2 to 5 percent earlier than when using the table
for Color ID.
Color Quality
Color quality will be at the same level as that of printers
adjusted by the conventional Head ID, and the same color
quality as mass-produced printers cannot be maintained.
100%
100%
Actual ink amount
Ink counter amount
Printer A
Ink discharge amount is low
Printer B
Ink discharge amount is standard
Printer C
Ink discharge amount is high
Remaining amount of ink when the
counter shows ink out.
Margin amount of ink
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