Epson R1800 - Stylus Photo Color Inkjet Printer, Service Manual

Page: 148 / 234

EPSON Stylus Photo R1800/R2400 Revision B
Adjustment Adjustment 148
Note : Calibration processes of "Color ID" and "Head ID" are exactly the same.
Calibration can be made by transmitting the ID to printer drivers and changing
dot generation rate in reference to the same calibration table.
†
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 ptinter 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 charateristic
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.
C H E C K
P O I N T
Make sure not to confuse Head ID with Color ID.
„
Head ID
An ID information specific to individual print head. It is
indicated on the Head QR Code Label attached to the
print head.
„
Color ID
An ID information specific to individual printer. It is
obtained by the Colorimetric Calibration.
C A U T I O N
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.
C A U T I O N
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%
Act
u
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k am
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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