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dC972 Printhead Uniformity
Purpose
To adjust the printheads and jets to maintain uniform image quality.
Printhead Uniformity adjusts individual printheads and jets for image quality. Printhead charac-
teristics change during use and at different rates. This procedure adjusts the printheads to
compensate for any change in their characteristics.
Media Requirements
The required media size is A4 or 8.5x11 inch. Use the best quality, bright white plain paper
available. Do not use glossy, colored, preprinted or punched media. Do not mix media types.
Use media that is as close as possible to 90gsm (24lb) and 98 brightness.
NOTE: In North America only, the brightness rating is printed on the paper ream wrapper.
Do not use card stock or media less than or equal to 18lbs (68 gsm). Failure to follow media
requirements may result in incorrect adjustments.
Refer to
Table 1
for the required media quantity and routine duration.
Table 1 Media and time requirements
Option
Required Media Quantity
1. Printhead Uniformity - Manual
17 sheets.
(runs options 2 through 5)
1. Printhead Uniformity - Automatic
8 sheets.
(runs options 2 through 5)
2. Head to Head Alignment Adjust
N/A
3. Head to Head Uniformity - Manual 13 sheets.
3. Head to Head Uniformity - Auto-
6 sheets.
matic
4. TRC Generation - Manual
2 sheets.
4. TRC Generation - Automatic
N/A
5. Y Dot Position Correction
N/A
6. Reset Head Uniformity Data
N/A
General Guidelines
NOTE: The order of adjustments is important and must be performed in numerical order
(except option 6) unless instructed otherwise.
•
When instructed to run dC972 without any options specified, run the manual Printhead
Uniformity (Option 1).
•
When instructed to run dC972 without manual or automatic specified, choose manual.
•
The Reset Head Uniformity Data routine (option 6) deletes the current adjustments (non-
recoverable) and restores the manufacturing settings. Only perform this routine if
instructed.
•
The printer will save the adjustments after each option. If something interrupts the com-
pletion of a selected option, restart from the beginning of the interrupted option.
General Procedures/Information
dC972
•
The automatic dC972 runs periodically in the background during periods of inactivity and
does not require user intervention. It is only to be used when specifically directed.
Procedure
Perform the following:
1.
Load at least 40 sheets of the required media into tray 3. To guarantee that tray 3 is used,
open all other trays.
2.
Enter service mode,
3.
Select the Adjustments tab.
4.
Select dC972 Printhead Uniformity.
5.
The routine provides 6 options:
a.
Option 1 - Printhead Uniformity
b.
Option 2 - Head to Head Alignment Adjust
c.
Option 3 - Head to Head Uniformity
d.
Option 4 - TRC Generation
e.
Option 5 - Y Dot Position Correction
f.
Option 6 - Reset Head Uniformity Data
NOTE: If an option fails to complete, go to
Duration (minutes)
6.
Select Close to return to the Adjustment routines window.
18 - 32
7.
Select Call Closeout, then Exit Only to exit service mode.
Option 1 - Printhead Uniformity
9 -24
NOTE: The Printhead Uniformity routine (option 1) runs options 2 through 5.
1 -3
The routine provides the following options:
6 -18
•
Select Heads 1, 2, 3 or 4 - Select required printheads. It is recommended that all print-
heads are selected, irrespective of which printhead was replaced.
2
•
Manual - Select for best results, this requires test patterns to be scanned using the
DADH. Manual operation is recommended for printhead calibration.
6
•
Auto - Refer to
N/A
•
Start - Select to run the routine. Follow the instructions on the UI.
4 - 8
For additional information and checks that must be performed before running Option 1, refer to:
Less than 1
•
Option 2 - Head to Head Alignment Adjust
•
Option 3 - Head to Head Uniformity
•
Option 4 - TRC Generation
•
Option 5 - Y Dot Position Correction
Option 2 - Head to Head Alignment Adjust
The routine aligns the printheads with X-stitch, Y-stitch and roll adjustments automatically and
requires no intervention. This is the same routine as
ment.
Start - Select to run the routine.
During the routine:
1.
The test image is printed and scanned on the drum, then cleaned off. No pages are
printed.
February 2013
6-292
GP
1.
Fault
Recovery.
General
Guidelines.
dC971
Head to Head Alignment Adjust-
ColorQube® 9303 Family
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